/* Target-dependent code for GDB, the GNU debugger.
- Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
for IBM Deutschland Entwicklung GmbH, IBM Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#define S390_TDEP /* for special macros in tm-s390.h */
-#include <defs.h>
+#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "inferior.h"
#include "target.h"
#include "gdbcore.h"
#include "gdbcmd.h"
-#include "symfile.h"
#include "objfiles.h"
-#include "tm.h"
-#include "../bfd/bfd.h"
#include "floatformat.h"
#include "regcache.h"
+#include "trad-frame.h"
+#include "frame-base.h"
+#include "frame-unwind.h"
+#include "dwarf2-frame.h"
+#include "reggroups.h"
+#include "regset.h"
#include "value.h"
#include "gdb_assert.h"
+#include "dis-asm.h"
+#include "solib-svr4.h"
+#include "prologue-value.h"
+#include "s390-tdep.h"
+/* The tdep structure. */
-/* Number of bytes of storage in the actual machine representation
- for register N. */
-int
-s390_register_raw_size (int reg_nr)
+struct gdbarch_tdep
{
- if (S390_FP0_REGNUM <= reg_nr
- && reg_nr < S390_FP0_REGNUM + S390_NUM_FPRS)
- return S390_FPR_SIZE;
- else
- return 4;
-}
+ /* ABI version. */
+ enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi;
-int
-s390x_register_raw_size (int reg_nr)
+ /* Core file register sets. */
+ const struct regset *gregset;
+ int sizeof_gregset;
+
+ const struct regset *fpregset;
+ int sizeof_fpregset;
+};
+
+
+/* Return the name of register REGNUM. */
+static const char *
+s390_register_name (int regnum)
{
- return (reg_nr == S390_FPC_REGNUM)
- || (reg_nr >= S390_FIRST_ACR && reg_nr <= S390_LAST_ACR) ? 4 : 8;
+ static const char *register_names[S390_NUM_TOTAL_REGS] =
+ {
+ /* Program Status Word. */
+ "pswm", "pswa",
+ /* General Purpose Registers. */
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+ /* Access Registers. */
+ "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
+ "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15",
+ /* Floating Point Control Word. */
+ "fpc",
+ /* Floating Point Registers. */
+ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
+ "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
+ /* Pseudo registers. */
+ "pc", "cc",
+ };
+
+ gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS);
+ return register_names[regnum];
}
-int
-s390_cannot_fetch_register (int regno)
+/* Return the GDB type object for the "standard" data type of data in
+ register REGNUM. */
+static struct type *
+s390_register_type (struct gdbarch *gdbarch, int regnum)
{
- return (regno >= S390_FIRST_CR && regno < (S390_FIRST_CR + 9)) ||
- (regno >= (S390_FIRST_CR + 12) && regno <= S390_LAST_CR);
+ if (regnum == S390_PSWM_REGNUM || regnum == S390_PSWA_REGNUM)
+ return builtin_type_long;
+ if (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM)
+ return builtin_type_long;
+ if (regnum >= S390_A0_REGNUM && regnum <= S390_A15_REGNUM)
+ return builtin_type_int;
+ if (regnum == S390_FPC_REGNUM)
+ return builtin_type_int;
+ if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM)
+ return builtin_type_double;
+ if (regnum == S390_PC_REGNUM)
+ return builtin_type_void_func_ptr;
+ if (regnum == S390_CC_REGNUM)
+ return builtin_type_int;
+
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
-int
-s390_register_byte (int reg_nr)
+/* DWARF Register Mapping. */
+
+static int s390_dwarf_regmap[] =
{
- if (reg_nr <= S390_GP_LAST_REGNUM)
- return reg_nr * S390_GPR_SIZE;
- if (reg_nr <= S390_LAST_ACR)
- return S390_ACR0_OFFSET + (((reg_nr) - S390_FIRST_ACR) * S390_ACR_SIZE);
- if (reg_nr <= S390_LAST_CR)
- return S390_CR0_OFFSET + (((reg_nr) - S390_FIRST_CR) * S390_CR_SIZE);
- if (reg_nr == S390_FPC_REGNUM)
- return S390_FPC_OFFSET;
- else
- return S390_FP0_OFFSET + (((reg_nr) - S390_FP0_REGNUM) * S390_FPR_SIZE);
-}
-
-#ifndef GDBSERVER
-#define S390_MAX_INSTR_SIZE (6)
-#define S390_SYSCALL_OPCODE (0x0a)
-#define S390_SYSCALL_SIZE (2)
-#define S390_SIGCONTEXT_SREGS_OFFSET (8)
-#define S390X_SIGCONTEXT_SREGS_OFFSET (8)
-#define S390_SIGREGS_FP0_OFFSET (144)
-#define S390X_SIGREGS_FP0_OFFSET (216)
-#define S390_UC_MCONTEXT_OFFSET (256)
-#define S390X_UC_MCONTEXT_OFFSET (344)
-#define S390_STACK_FRAME_OVERHEAD (GDB_TARGET_IS_ESAME ? 160:96)
-#define S390_SIGNAL_FRAMESIZE (GDB_TARGET_IS_ESAME ? 160:96)
-#define s390_NR_sigreturn 119
-#define s390_NR_rt_sigreturn 173
-
-
-
-struct frame_extra_info
-{
- int initialised;
- int good_prologue;
- CORE_ADDR function_start;
- CORE_ADDR skip_prologue_function_start;
- CORE_ADDR saved_pc_valid;
- CORE_ADDR saved_pc;
- CORE_ADDR sig_fixed_saved_pc_valid;
- CORE_ADDR sig_fixed_saved_pc;
- CORE_ADDR frame_pointer_saved_pc; /* frame pointer needed for alloca */
- CORE_ADDR stack_bought; /* amount we decrement the stack pointer by */
- CORE_ADDR sigcontext;
+ /* General Purpose Registers. */
+ S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
+ S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
+ S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
+ S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
+
+ /* Floating Point Registers. */
+ S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
+ S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
+ S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
+ S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
+
+ /* Control Registers (not mapped). */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+
+ /* Access Registers. */
+ S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
+ S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
+ S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
+ S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
+
+ /* Program Status Word. */
+ S390_PSWM_REGNUM,
+ S390_PSWA_REGNUM
};
+/* Convert DWARF register number REG to the appropriate register
+ number used by GDB. */
+static int
+s390_dwarf_reg_to_regnum (int reg)
+{
+ int regnum = -1;
+
+ if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
+ regnum = s390_dwarf_regmap[reg];
+
+ if (regnum == -1)
+ warning (_("Unmapped DWARF Register #%d encountered."), reg);
+
+ return regnum;
+}
-static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi);
+/* Pseudo registers - PC and condition code. */
-int
-s390_readinstruction (bfd_byte instr[], CORE_ADDR at,
- struct disassemble_info *info)
+static void
+s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, gdb_byte *buf)
{
- int instrlen;
+ ULONGEST val;
- static int s390_instrlen[] = {
- 2,
- 4,
- 4,
- 6
- };
- if ((*info->read_memory_func) (at, &instr[0], 2, info))
- return -1;
- instrlen = s390_instrlen[instr[0] >> 6];
- if (instrlen > 2)
+ switch (regnum)
{
- if ((*info->read_memory_func) (at + 2, &instr[2], instrlen - 2, info))
- return -1;
+ case S390_PC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
+ store_unsigned_integer (buf, 4, val & 0x7fffffff);
+ break;
+
+ case S390_CC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+ store_unsigned_integer (buf, 4, (val >> 12) & 3);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
}
- return instrlen;
}
static void
-s390_memset_extra_info (struct frame_extra_info *fextra_info)
+s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const gdb_byte *buf)
{
- memset (fextra_info, 0, sizeof (struct frame_extra_info));
-}
+ ULONGEST val, psw;
+
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
+ psw = (psw & 0x80000000) | (val & 0x7fffffff);
+ regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, psw);
+ break;
+ case S390_CC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+ psw = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
+ regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
+}
-const char *
-s390_register_name (int reg_nr)
+static void
+s390x_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, gdb_byte *buf)
{
- static char *register_names[] = {
- "pswm", "pswa",
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
- "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
- "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15",
- "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
- "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15",
- "fpc",
- "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
- "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
- };
+ ULONGEST val;
- if (reg_nr <= S390_LAST_REGNUM)
- return register_names[reg_nr];
- else
- return NULL;
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ regcache_raw_read (regcache, S390_PSWA_REGNUM, buf);
+ break;
+
+ case S390_CC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+ store_unsigned_integer (buf, 4, (val >> 44) & 3);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
}
+static void
+s390x_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const gdb_byte *buf)
+{
+ ULONGEST val, psw;
+
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ regcache_raw_write (regcache, S390_PSWA_REGNUM, buf);
+ break;
+
+ case S390_CC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+ psw = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
+ regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__, _("invalid regnum"));
+ }
+}
+/* 'float' values are stored in the upper half of floating-point
+ registers, even though we are otherwise a big-endian platform. */
-int
-s390_stab_reg_to_regnum (int regno)
+static struct value *
+s390_value_from_register (struct type *type, int regnum,
+ struct frame_info *frame)
{
- return regno >= 64 ? S390_PSWM_REGNUM - 64 :
- regno >= 48 ? S390_FIRST_ACR - 48 :
- regno >= 32 ? S390_FIRST_CR - 32 :
- regno <= 15 ? (regno + 2) :
- S390_FP0_REGNUM + ((regno - 16) & 8) + (((regno - 16) & 3) << 1) +
- (((regno - 16) & 4) >> 2);
+ struct value *value = default_value_from_register (type, regnum, frame);
+ int len = TYPE_LENGTH (type);
+
+ if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM && len < 8)
+ set_value_offset (value, 0);
+
+ return value;
}
+/* Register groups. */
-/* Return true if REGIDX is the number of a register used to pass
- arguments, false otherwise. */
static int
-is_arg_reg (int regidx)
+s390_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
{
- return 2 <= regidx && regidx <= 6;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* Registers displayed via 'info regs'. */
+ if (group == general_reggroup)
+ return (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM)
+ || regnum == S390_PC_REGNUM
+ || regnum == S390_CC_REGNUM;
+
+ /* Registers displayed via 'info float'. */
+ if (group == float_reggroup)
+ return (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM)
+ || regnum == S390_FPC_REGNUM;
+
+ /* Registers that need to be saved/restored in order to
+ push or pop frames. */
+ if (group == save_reggroup || group == restore_reggroup)
+ return regnum != S390_PSWM_REGNUM && regnum != S390_PSWA_REGNUM;
+
+ return default_register_reggroup_p (gdbarch, regnum, group);
}
-/* s390_get_frame_info based on Hartmuts
- prologue definition in
- gcc-2.8.1/config/l390/linux.c
+/* Core file register sets. */
- It reads one instruction at a time & based on whether
- it looks like prologue code or not it makes a decision on
- whether the prologue is over, there are various state machines
- in the code to determine if the prologue code is possilby valid.
-
- This is done to hopefully allow the code survive minor revs of
- calling conventions.
-
- */
-
-int
-s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
- struct frame_info *fi, int init_extra_info)
-{
-#define CONST_POOL_REGIDX 13
-#define GOT_REGIDX 12
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- CORE_ADDR test_pc = pc, test_pc2;
- CORE_ADDR orig_sp = 0, save_reg_addr = 0, *saved_regs = NULL;
- int valid_prologue, good_prologue = 0;
- int gprs_saved[S390_NUM_GPRS];
- int fprs_saved[S390_NUM_FPRS];
- int regidx, instrlen;
- int const_pool_state;
- int varargs_state;
- int loop_cnt, gdb_gpr_store, gdb_fpr_store;
- int offset, expected_offset;
- int err = 0;
- disassemble_info info;
-
- /* Have we seen an instruction initializing the frame pointer yet?
- If we've seen an `lr %r11, %r15', then frame_pointer_found is
- non-zero, and frame_pointer_regidx == 11. Otherwise,
- frame_pointer_found is zero and frame_pointer_regidx is 15,
- indicating that we're using the stack pointer as our frame
- pointer. */
- int frame_pointer_found = 0;
- int frame_pointer_regidx = 0xf;
-
- /* What we've seen so far regarding saving the back chain link:
- 0 -- nothing yet; sp still has the same value it had at the entry
- point. Since not all functions allocate frames, this is a
- valid state for the prologue to finish in.
- 1 -- We've saved the original sp in some register other than the
- frame pointer (hard-coded to be %r11, yuck).
- save_link_regidx is the register we saved it in.
- 2 -- We've seen the initial `bras' instruction of the sequence for
- reserving more than 32k of stack:
- bras %rX, .+8
- .long N
- s %r15, 0(%rX)
- where %rX is not the constant pool register.
- subtract_sp_regidx is %rX, and fextra_info->stack_bought is N.
- 3 -- We've reserved space for a new stack frame. This means we
- either saw a simple `ahi %r15,-N' in state 1, or the final
- `s %r15, ...' in state 2.
- 4 -- The frame and link are now fully initialized. We've
- reserved space for the new stack frame, and stored the old
- stack pointer captured in the back chain pointer field. */
- int save_link_state = 0;
- int save_link_regidx, subtract_sp_regidx;
-
- /* What we've seen so far regarding r12 --- the GOT (Global Offset
- Table) pointer. We expect to see `l %r12, N(%r13)', which loads
- r12 with the offset from the constant pool to the GOT, and then
- an `ar %r12, %r13', which adds the constant pool address,
- yielding the GOT's address. Here's what got_state means:
- 0 -- seen nothing
- 1 -- seen `l %r12, N(%r13)', but no `ar'
- 2 -- seen load and add, so GOT pointer is totally initialized
- When got_state is 1, then got_load_addr is the address of the
- load instruction, and got_load_len is the length of that
- instruction. */
- int got_state= 0;
- CORE_ADDR got_load_addr = 0, got_load_len = 0;
-
- const_pool_state = varargs_state = 0;
-
- memset (gprs_saved, 0, sizeof (gprs_saved));
- memset (fprs_saved, 0, sizeof (fprs_saved));
- info.read_memory_func = dis_asm_read_memory;
-
- save_link_regidx = subtract_sp_regidx = 0;
- if (fextra_info)
+int s390_regmap_gregset[S390_NUM_REGS] =
+{
+ /* Program Status Word. */
+ 0x00, 0x04,
+ /* General Purpose Registers. */
+ 0x08, 0x0c, 0x10, 0x14,
+ 0x18, 0x1c, 0x20, 0x24,
+ 0x28, 0x2c, 0x30, 0x34,
+ 0x38, 0x3c, 0x40, 0x44,
+ /* Access Registers. */
+ 0x48, 0x4c, 0x50, 0x54,
+ 0x58, 0x5c, 0x60, 0x64,
+ 0x68, 0x6c, 0x70, 0x74,
+ 0x78, 0x7c, 0x80, 0x84,
+ /* Floating Point Control Word. */
+ -1,
+ /* Floating Point Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390x_regmap_gregset[S390_NUM_REGS] =
+{
+ 0x00, 0x08,
+ /* General Purpose Registers. */
+ 0x10, 0x18, 0x20, 0x28,
+ 0x30, 0x38, 0x40, 0x48,
+ 0x50, 0x58, 0x60, 0x68,
+ 0x70, 0x78, 0x80, 0x88,
+ /* Access Registers. */
+ 0x90, 0x94, 0x98, 0x9c,
+ 0xa0, 0xa4, 0xa8, 0xac,
+ 0xb0, 0xb4, 0xb8, 0xbc,
+ 0xc0, 0xc4, 0xc8, 0xcc,
+ /* Floating Point Control Word. */
+ -1,
+ /* Floating Point Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390_regmap_fpregset[S390_NUM_REGS] =
+{
+ /* Program Status Word. */
+ -1, -1,
+ /* General Purpose Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* Access Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* Floating Point Control Word. */
+ 0x00,
+ /* Floating Point Registers. */
+ 0x08, 0x10, 0x18, 0x20,
+ 0x28, 0x30, 0x38, 0x40,
+ 0x48, 0x50, 0x58, 0x60,
+ 0x68, 0x70, 0x78, 0x80,
+};
+
+/* Supply register REGNUM from the register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
+static void
+s390_supply_regset (const struct regset *regset, struct regcache *regcache,
+ int regnum, const void *regs, size_t len)
+{
+ const int *offset = regset->descr;
+ int i;
+
+ for (i = 0; i < S390_NUM_REGS; i++)
{
- if (fi && get_frame_base (fi))
- {
- orig_sp = get_frame_base (fi);
- if (! init_extra_info && fextra_info->initialised)
- orig_sp += fextra_info->stack_bought;
- saved_regs = get_frame_saved_regs (fi);
- }
- if (init_extra_info || !fextra_info->initialised)
- {
- s390_memset_extra_info (fextra_info);
- fextra_info->function_start = pc;
- fextra_info->initialised = 1;
- }
+ if ((regnum == i || regnum == -1) && offset[i] != -1)
+ regcache_raw_supply (regcache, i, (const char *)regs + offset[i]);
}
- instrlen = 0;
- do
+}
+
+/* Collect register REGNUM from the register cache REGCACHE and store
+ it in the buffer specified by REGS and LEN as described by the
+ general-purpose register set REGSET. If REGNUM is -1, do this for
+ all registers in REGSET. */
+static void
+s390_collect_regset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *regs, size_t len)
+{
+ const int *offset = regset->descr;
+ int i;
+
+ for (i = 0; i < S390_NUM_REGS; i++)
{
- valid_prologue = 0;
- test_pc += instrlen;
- /* add the previous instruction len */
- instrlen = s390_readinstruction (instr, test_pc, &info);
- if (instrlen < 0)
- {
- good_prologue = 0;
- err = -1;
- break;
- }
- /* We probably are in a glibc syscall */
- if (instr[0] == S390_SYSCALL_OPCODE && test_pc == pc)
- {
- good_prologue = 1;
- if (saved_regs && fextra_info && fi->next && fi->next->extra_info
- && fi->next->extra_info->sigcontext)
- {
- /* We are backtracing from a signal handler */
- save_reg_addr = fi->next->extra_info->sigcontext +
- REGISTER_BYTE (S390_GP0_REGNUM);
- for (regidx = 0; regidx < S390_NUM_GPRS; regidx++)
- {
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_GPR_SIZE;
- }
- save_reg_addr = fi->next->extra_info->sigcontext +
- (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET :
- S390_SIGREGS_FP0_OFFSET);
- for (regidx = 0; regidx < S390_NUM_FPRS; regidx++)
- {
- saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_FPR_SIZE;
- }
- }
- break;
- }
- if (save_link_state == 0)
- {
- /* check for a stack relative STMG or STM */
- if (((GDB_TARGET_IS_ESAME &&
- ((instr[0] == 0xeb) && (instr[5] == 0x24))) ||
- (instr[0] == 0x90)) && ((instr[2] >> 4) == 0xf))
- {
- regidx = (instr[1] >> 4);
- if (regidx < 6)
- varargs_state = 1;
- offset = ((instr[2] & 0xf) << 8) + instr[3];
- expected_offset =
- S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6));
- if (offset != expected_offset)
- {
- good_prologue = 0;
- break;
- }
- if (saved_regs)
- save_reg_addr = orig_sp + offset;
- for (; regidx <= (instr[1] & 0xf); regidx++)
- {
- if (gprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- good_prologue = 1;
- gprs_saved[regidx] = 1;
- if (saved_regs)
- {
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_GPR_SIZE;
- }
- }
- valid_prologue = 1;
- continue;
- }
- }
- /* check for a stack relative STG or ST */
- if ((save_link_state == 0 || save_link_state == 3) &&
- ((GDB_TARGET_IS_ESAME &&
- ((instr[0] == 0xe3) && (instr[5] == 0x24))) ||
- (instr[0] == 0x50)) && ((instr[2] >> 4) == 0xf))
- {
- regidx = instr[1] >> 4;
- offset = ((instr[2] & 0xf) << 8) + instr[3];
- if (offset == 0)
- {
- if (save_link_state == 3 && regidx == save_link_regidx)
- {
- save_link_state = 4;
- valid_prologue = 1;
- continue;
- }
- else
- break;
- }
- if (regidx < 6)
- varargs_state = 1;
- expected_offset =
- S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6));
- if (offset != expected_offset)
- {
- good_prologue = 0;
- break;
- }
- if (gprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- good_prologue = 1;
- gprs_saved[regidx] = 1;
- if (saved_regs)
- {
- save_reg_addr = orig_sp + offset;
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- }
- valid_prologue = 1;
- continue;
- }
+ if ((regnum == i || regnum == -1) && offset[i] != -1)
+ regcache_raw_collect (regcache, i, (char *)regs + offset[i]);
+ }
+}
- /* Check for an fp-relative STG, ST, or STM. This is probably
- spilling an argument from a register out into a stack slot.
- This could be a user instruction, but if we haven't included
- any other suspicious instructions in the prologue, this
- could only be an initializing store, which isn't too bad to
- skip. The consequences of not including arg-to-stack spills
- are more serious, though --- you don't see the proper values
- of the arguments. */
- if ((save_link_state == 3 || save_link_state == 4)
- && ((instr[0] == 0x50 /* st %rA, D(%rX,%rB) */
- && (instr[1] & 0xf) == 0 /* %rX is zero, no index reg */
- && is_arg_reg ((instr[1] >> 4) & 0xf)
- && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)
- || (instr[0] == 0x90 /* stm %rA, %rB, D(%rC) */
- && is_arg_reg ((instr[1] >> 4) & 0xf)
- && is_arg_reg (instr[1] & 0xf)
- && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)))
- {
- valid_prologue = 1;
- continue;
- }
+static const struct regset s390_gregset = {
+ s390_regmap_gregset,
+ s390_supply_regset,
+ s390_collect_regset
+};
- /* check for STD */
- if (instr[0] == 0x60 && (instr[2] >> 4) == 0xf)
- {
- regidx = instr[1] >> 4;
- if (regidx == 0 || regidx == 2)
- varargs_state = 1;
- if (fprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- fprs_saved[regidx] = 1;
- if (saved_regs)
- {
- save_reg_addr = orig_sp + (((instr[2] & 0xf) << 8) + instr[3]);
- saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr;
- }
- valid_prologue = 1;
- continue;
- }
+static const struct regset s390x_gregset = {
+ s390x_regmap_gregset,
+ s390_supply_regset,
+ s390_collect_regset
+};
+static const struct regset s390_fpregset = {
+ s390_regmap_fpregset,
+ s390_supply_regset,
+ s390_collect_regset
+};
- if (const_pool_state == 0)
- {
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
+const struct regset *
+s390_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- if (GDB_TARGET_IS_ESAME)
- {
- /* Check for larl CONST_POOL_REGIDX,offset on ESAME */
- if ((instr[0] == 0xc0)
- && (instr[1] == (CONST_POOL_REGIDX << 4)))
- {
- const_pool_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- else
- {
- /* Check for BASR gpr13,gpr0 used to load constant pool pointer to r13 in old compiler */
- if (instr[0] == 0xd && (instr[1] & 0xf) == 0
- && ((instr[1] >> 4) == CONST_POOL_REGIDX))
- {
- const_pool_state = 1;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for new fangled bras %r13,newpc to load new constant pool */
- /* embedded in code, older pre abi compilers also emitted this stuff. */
- if ((instr[0] == 0xa7) && ((instr[1] & 0xf) == 0x5) &&
- ((instr[1] >> 4) == CONST_POOL_REGIDX)
- && ((instr[2] & 0x80) == 0))
- {
- const_pool_state = 2;
- test_pc +=
- (((((instr[2] & 0xf) << 8) + instr[3]) << 1) - instrlen);
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for AGHI or AHI CONST_POOL_REGIDX,val */
- if (const_pool_state == 1 && (instr[0] == 0xa7) &&
- ((GDB_TARGET_IS_ESAME &&
- (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xb))) ||
- (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xa))))
- {
- const_pool_state = 2;
- valid_prologue = 1;
- continue;
- }
- /* Check for LGR or LR gprx,15 */
- if ((GDB_TARGET_IS_ESAME &&
- instr[0] == 0xb9 && instr[1] == 0x04 && (instr[3] & 0xf) == 0xf) ||
- (instr[0] == 0x18 && (instr[1] & 0xf) == 0xf))
- {
- if (GDB_TARGET_IS_ESAME)
- regidx = instr[3] >> 4;
- else
- regidx = instr[1] >> 4;
- if (save_link_state == 0 && regidx != 0xb)
- {
- /* Almost defintely code for
- decrementing the stack pointer
- ( i.e. a non leaf function
- or else leaf with locals ) */
- save_link_regidx = regidx;
- save_link_state = 1;
- valid_prologue = 1;
- continue;
- }
- /* We use this frame pointer for alloca
- unfortunately we need to assume its gpr11
- otherwise we would need a smarter prologue
- walker. */
- if (!frame_pointer_found && regidx == 0xb)
- {
- frame_pointer_regidx = 0xb;
- frame_pointer_found = 1;
- if (fextra_info)
- fextra_info->frame_pointer_saved_pc = test_pc;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for AHI or AGHI gpr15,val */
- if (save_link_state == 1 && (instr[0] == 0xa7) &&
- ((GDB_TARGET_IS_ESAME && (instr[1] == 0xfb)) || (instr[1] == 0xfa)))
- {
- if (fextra_info)
- fextra_info->stack_bought =
- -extract_signed_integer (&instr[2], 2);
- save_link_state = 3;
- valid_prologue = 1;
- continue;
- }
- /* Alternatively check for the complex construction for
- buying more than 32k of stack
- BRAS gprx,.+8
- long val
- s %r15,0(%gprx) gprx currently r1 */
- if ((save_link_state == 1) && (instr[0] == 0xa7)
- && ((instr[1] & 0xf) == 0x5) && (instr[2] == 0)
- && (instr[3] == 0x4) && ((instr[1] >> 4) != CONST_POOL_REGIDX))
- {
- subtract_sp_regidx = instr[1] >> 4;
- save_link_state = 2;
- if (fextra_info)
- target_read_memory (test_pc + instrlen,
- (char *) &fextra_info->stack_bought,
- sizeof (fextra_info->stack_bought));
- test_pc += 4;
- valid_prologue = 1;
- continue;
- }
- if (save_link_state == 2 && instr[0] == 0x5b
- && instr[1] == 0xf0 &&
- instr[2] == (subtract_sp_regidx << 4) && instr[3] == 0)
- {
- save_link_state = 3;
- valid_prologue = 1;
- continue;
- }
- /* check for LA gprx,offset(15) used for varargs */
- if ((instr[0] == 0x41) && ((instr[2] >> 4) == 0xf) &&
- ((instr[1] & 0xf) == 0))
- {
- /* some code uses gpr7 to point to outgoing args */
- if (((instr[1] >> 4) == 7) && (save_link_state == 0) &&
- ((instr[2] & 0xf) == 0)
- && (instr[3] == S390_STACK_FRAME_OVERHEAD))
- {
- valid_prologue = 1;
- continue;
- }
- if (varargs_state == 1)
- {
- varargs_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for a GOT load */
+ if (strcmp (sect_name, ".reg") == 0 && sect_size == tdep->sizeof_gregset)
+ return tdep->gregset;
- if (GDB_TARGET_IS_ESAME)
- {
- /* Check for larl GOT_REGIDX, on ESAME */
- if ((got_state == 0) && (instr[0] == 0xc0)
- && (instr[1] == (GOT_REGIDX << 4)))
- {
- got_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- else
- {
- /* check for l GOT_REGIDX,x(CONST_POOL_REGIDX) */
- if (got_state == 0 && const_pool_state == 2 && instr[0] == 0x58
- && (instr[2] == (CONST_POOL_REGIDX << 4))
- && ((instr[1] >> 4) == GOT_REGIDX))
- {
- got_state = 1;
- got_load_addr = test_pc;
- got_load_len = instrlen;
- valid_prologue = 1;
- continue;
- }
- /* Check for subsequent ar got_regidx,basr_regidx */
- if (got_state == 1 && instr[0] == 0x1a &&
- instr[1] == ((GOT_REGIDX << 4) | CONST_POOL_REGIDX))
- {
- got_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- }
- while (valid_prologue && good_prologue);
- if (good_prologue)
+ if (strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset)
+ return tdep->fpregset;
+
+ return NULL;
+}
+
+
+/* Decoding S/390 instructions. */
+
+/* Named opcode values for the S/390 instructions we recognize. Some
+ instructions have their opcode split across two fields; those are the
+ op1_* and op2_* enums. */
+enum
+ {
+ op1_lhi = 0xa7, op2_lhi = 0x08,
+ op1_lghi = 0xa7, op2_lghi = 0x09,
+ op1_lgfi = 0xc0, op2_lgfi = 0x01,
+ op_lr = 0x18,
+ op_lgr = 0xb904,
+ op_l = 0x58,
+ op1_ly = 0xe3, op2_ly = 0x58,
+ op1_lg = 0xe3, op2_lg = 0x04,
+ op_lm = 0x98,
+ op1_lmy = 0xeb, op2_lmy = 0x98,
+ op1_lmg = 0xeb, op2_lmg = 0x04,
+ op_st = 0x50,
+ op1_sty = 0xe3, op2_sty = 0x50,
+ op1_stg = 0xe3, op2_stg = 0x24,
+ op_std = 0x60,
+ op_stm = 0x90,
+ op1_stmy = 0xeb, op2_stmy = 0x90,
+ op1_stmg = 0xeb, op2_stmg = 0x24,
+ op1_aghi = 0xa7, op2_aghi = 0x0b,
+ op1_ahi = 0xa7, op2_ahi = 0x0a,
+ op1_agfi = 0xc2, op2_agfi = 0x08,
+ op1_afi = 0xc2, op2_afi = 0x09,
+ op1_algfi= 0xc2, op2_algfi= 0x0a,
+ op1_alfi = 0xc2, op2_alfi = 0x0b,
+ op_ar = 0x1a,
+ op_agr = 0xb908,
+ op_a = 0x5a,
+ op1_ay = 0xe3, op2_ay = 0x5a,
+ op1_ag = 0xe3, op2_ag = 0x08,
+ op1_slgfi= 0xc2, op2_slgfi= 0x04,
+ op1_slfi = 0xc2, op2_slfi = 0x05,
+ op_sr = 0x1b,
+ op_sgr = 0xb909,
+ op_s = 0x5b,
+ op1_sy = 0xe3, op2_sy = 0x5b,
+ op1_sg = 0xe3, op2_sg = 0x09,
+ op_nr = 0x14,
+ op_ngr = 0xb980,
+ op_la = 0x41,
+ op1_lay = 0xe3, op2_lay = 0x71,
+ op1_larl = 0xc0, op2_larl = 0x00,
+ op_basr = 0x0d,
+ op_bas = 0x4d,
+ op_bcr = 0x07,
+ op_bc = 0x0d,
+ op1_bras = 0xa7, op2_bras = 0x05,
+ op1_brasl= 0xc0, op2_brasl= 0x05,
+ op1_brc = 0xa7, op2_brc = 0x04,
+ op1_brcl = 0xc0, op2_brcl = 0x04,
+ };
+
+
+/* Read a single instruction from address AT. */
+
+#define S390_MAX_INSTR_SIZE 6
+static int
+s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
+{
+ static int s390_instrlen[] = { 2, 4, 4, 6 };
+ int instrlen;
+
+ if (read_memory_nobpt (at, &instr[0], 2))
+ return -1;
+ instrlen = s390_instrlen[instr[0] >> 6];
+ if (instrlen > 2)
{
- /* If this function doesn't reference the global offset table,
- then the compiler may use r12 for other things. If the last
- instruction we saw was a load of r12 from the constant pool,
- with no subsequent add to make the address PC-relative, then
- the load was probably a genuine body instruction; don't treat
- it as part of the prologue. */
- if (got_state == 1
- && got_load_addr + got_load_len == test_pc)
- {
- test_pc = got_load_addr;
- instrlen = got_load_len;
- }
-
- good_prologue = (((const_pool_state == 0) || (const_pool_state == 2)) &&
- ((save_link_state == 0) || (save_link_state == 4)) &&
- ((varargs_state == 0) || (varargs_state == 2)));
+ if (read_memory_nobpt (at + 2, &instr[2], instrlen - 2))
+ return -1;
}
- if (fextra_info)
+ return instrlen;
+}
+
+
+/* The functions below are for recognizing and decoding S/390
+ instructions of various formats. Each of them checks whether INSN
+ is an instruction of the given format, with the specified opcodes.
+ If it is, it sets the remaining arguments to the values of the
+ instruction's fields, and returns a non-zero value; otherwise, it
+ returns zero.
+
+ These functions' arguments appear in the order they appear in the
+ instruction, not in the machine-language form. So, opcodes always
+ come first, even though they're sometimes scattered around the
+ instructions. And displacements appear before base and extension
+ registers, as they do in the assembly syntax, not at the end, as
+ they do in the machine language. */
+static int
+is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
+{
+ if (insn[0] == op1 && (insn[1] & 0xf) == op2)
{
- fextra_info->good_prologue = good_prologue;
- fextra_info->skip_prologue_function_start =
- (good_prologue ? test_pc : pc);
+ *r1 = (insn[1] >> 4) & 0xf;
+ /* i2 is a 16-bit signed quantity. */
+ *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
+ return 1;
}
- if (saved_regs)
- /* The SP's element of the saved_regs array holds the old SP,
- not the address at which it is saved. */
- saved_regs[S390_SP_REGNUM] = orig_sp;
- return err;
+ else
+ return 0;
}
-int
-s390_check_function_end (CORE_ADDR pc)
+static int
+is_ril (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, int *i2)
{
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- disassemble_info info;
- int regidx, instrlen;
-
- info.read_memory_func = dis_asm_read_memory;
- instrlen = s390_readinstruction (instr, pc, &info);
- if (instrlen < 0)
- return -1;
- /* check for BR */
- if (instrlen != 2 || instr[0] != 07 || (instr[1] >> 4) != 0xf)
+ if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ /* i2 is a signed quantity. If the host 'int' is 32 bits long,
+ no sign extension is necessary, but we don't want to assume
+ that. */
+ *i2 = (((insn[2] << 24)
+ | (insn[3] << 16)
+ | (insn[4] << 8)
+ | (insn[5])) ^ 0x80000000) - 0x80000000;
+ return 1;
+ }
+ else
return 0;
- regidx = instr[1] & 0xf;
- /* Check for LMG or LG */
- instrlen =
- s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4), &info);
- if (instrlen < 0)
- return -1;
- if (GDB_TARGET_IS_ESAME)
+}
+
+
+static int
+is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+{
+ if (insn[0] == op)
{
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r2 = insn[1] & 0xf;
+ return 1;
+ }
+ else
+ return 0;
+}
- if (instrlen != 6 || instr[0] != 0xeb || instr[5] != 0x4)
- return 0;
+
+static int
+is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+{
+ if (((insn[0] << 8) | insn[1]) == op)
+ {
+ /* Yes, insn[3]. insn[2] is unused in RRE format. */
+ *r1 = (insn[3] >> 4) & 0xf;
+ *r2 = insn[3] & 0xf;
+ return 1;
}
- else if (instrlen != 4 || instr[0] != 0x98)
+ else
+ return 0;
+}
+
+
+static int
+is_rs (bfd_byte *insn, int op,
+ unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
+{
+ if (insn[0] == op)
{
- return 0;
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r3 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ return 1;
}
- if ((instr[2] >> 4) != 0xf)
+ else
return 0;
- if (regidx == 14)
- return 1;
- instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8),
- &info);
- if (instrlen < 0)
- return -1;
- if (GDB_TARGET_IS_ESAME)
+}
+
+
+static int
+is_rsy (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
+{
+ if (insn[0] == op1
+ && insn[5] == op2)
{
- /* Check for LG */
- if (instrlen != 6 || instr[0] != 0xe3 || instr[5] != 0x4)
- return 0;
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r3 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ /* The 'long displacement' is a 20-bit signed integer. */
+ *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
+ ^ 0x80000) - 0x80000;
+ return 1;
}
else
+ return 0;
+}
+
+
+static int
+is_rx (bfd_byte *insn, int op,
+ unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
+{
+ if (insn[0] == op)
{
- /* Check for L */
- if (instrlen != 4 || instr[0] != 0x58)
- return 0;
+ *r1 = (insn[1] >> 4) & 0xf;
+ *x2 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ return 1;
}
- if (instr[2] >> 4 != 0xf)
+ else
return 0;
- if (instr[1] >> 4 != regidx)
+}
+
+
+static int
+is_rxy (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
+{
+ if (insn[0] == op1
+ && insn[5] == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ *x2 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ /* The 'long displacement' is a 20-bit signed integer. */
+ *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
+ ^ 0x80000) - 0x80000;
+ return 1;
+ }
+ else
return 0;
- return 1;
}
-static CORE_ADDR
-s390_sniff_pc_function_start (CORE_ADDR pc, struct frame_info *fi)
+
+/* Prologue analysis. */
+
+#define S390_NUM_GPRS 16
+#define S390_NUM_FPRS 16
+
+struct s390_prologue_data {
+
+ /* The stack. */
+ struct pv_area *stack;
+
+ /* The size of a GPR or FPR. */
+ int gpr_size;
+ int fpr_size;
+
+ /* The general-purpose registers. */
+ pv_t gpr[S390_NUM_GPRS];
+
+ /* The floating-point registers. */
+ pv_t fpr[S390_NUM_FPRS];
+
+ /* The offset relative to the CFA where the incoming GPR N was saved
+ by the function prologue. 0 if not saved or unknown. */
+ int gpr_slot[S390_NUM_GPRS];
+
+ /* Likewise for FPRs. */
+ int fpr_slot[S390_NUM_FPRS];
+
+ /* Nonzero if the backchain was saved. This is assumed to be the
+ case when the incoming SP is saved at the current SP location. */
+ int back_chain_saved_p;
+};
+
+/* Return the effective address for an X-style instruction, like:
+
+ L R1, D2(X2, B2)
+
+ Here, X2 and B2 are registers, and D2 is a signed 20-bit
+ constant; the effective address is the sum of all three. If either
+ X2 or B2 are zero, then it doesn't contribute to the sum --- this
+ means that r0 can't be used as either X2 or B2. */
+static pv_t
+s390_addr (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2)
{
- CORE_ADDR function_start, test_function_start;
- int loop_cnt, err, function_end;
- struct frame_extra_info fextra_info;
- function_start = get_pc_function_start (pc);
+ pv_t result;
- if (function_start == 0)
+ result = pv_constant (d2);
+ if (x2)
+ result = pv_add (result, data->gpr[x2]);
+ if (b2)
+ result = pv_add (result, data->gpr[b2]);
+
+ return result;
+}
+
+/* Do a SIZE-byte store of VALUE to D2(X2,B2). */
+static void
+s390_store (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2, CORE_ADDR size,
+ pv_t value)
+{
+ pv_t addr = s390_addr (data, d2, x2, b2);
+ pv_t offset;
+
+ /* Check whether we are storing the backchain. */
+ offset = pv_subtract (data->gpr[S390_SP_REGNUM - S390_R0_REGNUM], addr);
+
+ if (pv_is_constant (offset) && offset.k == 0)
+ if (size == data->gpr_size
+ && pv_is_register_k (value, S390_SP_REGNUM, 0))
+ {
+ data->back_chain_saved_p = 1;
+ return;
+ }
+
+
+ /* Check whether we are storing a register into the stack. */
+ if (!pv_area_store_would_trash (data->stack, addr))
+ pv_area_store (data->stack, addr, size, value);
+
+
+ /* Note: If this is some store we cannot identify, you might think we
+ should forget our cached values, as any of those might have been hit.
+
+ However, we make the assumption that the register save areas are only
+ ever stored to once in any given function, and we do recognize these
+ stores. Thus every store we cannot recognize does not hit our data. */
+}
+
+/* Do a SIZE-byte load from D2(X2,B2). */
+static pv_t
+s390_load (struct s390_prologue_data *data,
+ int d2, unsigned int x2, unsigned int b2, CORE_ADDR size)
+
+{
+ pv_t addr = s390_addr (data, d2, x2, b2);
+ pv_t offset;
+
+ /* If it's a load from an in-line constant pool, then we can
+ simulate that, under the assumption that the code isn't
+ going to change between the time the processor actually
+ executed it creating the current frame, and the time when
+ we're analyzing the code to unwind past that frame. */
+ if (pv_is_constant (addr))
{
- test_function_start = pc;
- if (test_function_start & 1)
- return 0; /* This has to be bogus */
- loop_cnt = 0;
- do
+ struct section_table *secp;
+ secp = target_section_by_addr (¤t_target, addr.k);
+ if (secp != NULL
+ && (bfd_get_section_flags (secp->bfd, secp->the_bfd_section)
+ & SEC_READONLY))
+ return pv_constant (read_memory_integer (addr.k, size));
+ }
+
+ /* Check whether we are accessing one of our save slots. */
+ return pv_area_fetch (data->stack, addr, size);
+}
+
+/* Function for finding saved registers in a 'struct pv_area'; we pass
+ this to pv_area_scan.
+
+ If VALUE is a saved register, ADDR says it was saved at a constant
+ offset from the frame base, and SIZE indicates that the whole
+ register was saved, record its offset in the reg_offset table in
+ PROLOGUE_UNTYPED. */
+static void
+s390_check_for_saved (void *data_untyped, pv_t addr, CORE_ADDR size, pv_t value)
+{
+ struct s390_prologue_data *data = data_untyped;
+ int i, offset;
+
+ if (!pv_is_register (addr, S390_SP_REGNUM))
+ return;
+
+ offset = 16 * data->gpr_size + 32 - addr.k;
+
+ /* If we are storing the original value of a register, we want to
+ record the CFA offset. If the same register is stored multiple
+ times, the stack slot with the highest address counts. */
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ if (size == data->gpr_size
+ && pv_is_register_k (value, S390_R0_REGNUM + i, 0))
+ if (data->gpr_slot[i] == 0
+ || data->gpr_slot[i] > offset)
{
+ data->gpr_slot[i] = offset;
+ return;
+ }
- err =
- s390_get_frame_info (test_function_start, &fextra_info, fi, 1);
- loop_cnt++;
- test_function_start -= 2;
- function_end = s390_check_function_end (test_function_start);
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ if (size == data->fpr_size
+ && pv_is_register_k (value, S390_F0_REGNUM + i, 0))
+ if (data->fpr_slot[i] == 0
+ || data->fpr_slot[i] > offset)
+ {
+ data->fpr_slot[i] = offset;
+ return;
}
- while (!(function_end == 1 || err || loop_cnt >= 4096 ||
- (fextra_info.good_prologue)));
- if (fextra_info.good_prologue)
- function_start = fextra_info.function_start;
- else if (function_end == 1)
- function_start = test_function_start;
- }
- return function_start;
}
+/* Analyze the prologue of the function starting at START_PC,
+ continuing at most until CURRENT_PC. Initialize DATA to
+ hold all information we find out about the state of the registers
+ and stack slots. Return the address of the instruction after
+ the last one that changed the SP, FP, or back chain; or zero
+ on error. */
+static CORE_ADDR
+s390_analyze_prologue (struct gdbarch *gdbarch,
+ CORE_ADDR start_pc,
+ CORE_ADDR current_pc,
+ struct s390_prologue_data *data)
+{
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
+ /* Our return value:
+ The address of the instruction after the last one that changed
+ the SP, FP, or back chain; zero if we got an error trying to
+ read memory. */
+ CORE_ADDR result = start_pc;
+
+ /* The current PC for our abstract interpretation. */
+ CORE_ADDR pc;
+
+ /* The address of the next instruction after that. */
+ CORE_ADDR next_pc;
+
+ /* Set up everything's initial value. */
+ {
+ int i;
+
+ data->stack = make_pv_area (S390_SP_REGNUM);
+
+ /* For the purpose of prologue tracking, we consider the GPR size to
+ be equal to the ABI word size, even if it is actually larger
+ (i.e. when running a 32-bit binary under a 64-bit kernel). */
+ data->gpr_size = word_size;
+ data->fpr_size = 8;
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ data->gpr[i] = pv_register (S390_R0_REGNUM + i, 0);
+
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ data->fpr[i] = pv_register (S390_F0_REGNUM + i, 0);
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ data->gpr_slot[i] = 0;
+
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ data->fpr_slot[i] = 0;
+
+ data->back_chain_saved_p = 0;
+ }
+
+ /* Start interpreting instructions, until we hit the frame's
+ current PC or the first branch instruction. */
+ for (pc = start_pc; pc > 0 && pc < current_pc; pc = next_pc)
+ {
+ bfd_byte insn[S390_MAX_INSTR_SIZE];
+ int insn_len = s390_readinstruction (insn, pc);
+
+ bfd_byte dummy[S390_MAX_INSTR_SIZE] = { 0 };
+ bfd_byte *insn32 = word_size == 4 ? insn : dummy;
+ bfd_byte *insn64 = word_size == 8 ? insn : dummy;
+
+ /* Fields for various kinds of instructions. */
+ unsigned int b2, r1, r2, x2, r3;
+ int i2, d2;
+
+ /* The values of SP and FP before this instruction,
+ for detecting instructions that change them. */
+ pv_t pre_insn_sp, pre_insn_fp;
+ /* Likewise for the flag whether the back chain was saved. */
+ int pre_insn_back_chain_saved_p;
+
+ /* If we got an error trying to read the instruction, report it. */
+ if (insn_len < 0)
+ {
+ result = 0;
+ break;
+ }
+
+ next_pc = pc + insn_len;
+
+ pre_insn_sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ pre_insn_fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+ pre_insn_back_chain_saved_p = data->back_chain_saved_p;
+
+
+ /* LHI r1, i2 --- load halfword immediate. */
+ /* LGHI r1, i2 --- load halfword immediate (64-bit version). */
+ /* LGFI r1, i2 --- load fullword immediate. */
+ if (is_ri (insn32, op1_lhi, op2_lhi, &r1, &i2)
+ || is_ri (insn64, op1_lghi, op2_lghi, &r1, &i2)
+ || is_ril (insn, op1_lgfi, op2_lgfi, &r1, &i2))
+ data->gpr[r1] = pv_constant (i2);
+
+ /* LR r1, r2 --- load from register. */
+ /* LGR r1, r2 --- load from register (64-bit version). */
+ else if (is_rr (insn32, op_lr, &r1, &r2)
+ || is_rre (insn64, op_lgr, &r1, &r2))
+ data->gpr[r1] = data->gpr[r2];
+
+ /* L r1, d2(x2, b2) --- load. */
+ /* LY r1, d2(x2, b2) --- load (long-displacement version). */
+ /* LG r1, d2(x2, b2) --- load (64-bit version). */
+ else if (is_rx (insn32, op_l, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_ly, op2_ly, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_lg, op2_lg, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = s390_load (data, d2, x2, b2, data->gpr_size);
+
+ /* ST r1, d2(x2, b2) --- store. */
+ /* STY r1, d2(x2, b2) --- store (long-displacement version). */
+ /* STG r1, d2(x2, b2) --- store (64-bit version). */
+ else if (is_rx (insn32, op_st, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_sty, op2_sty, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
+ s390_store (data, d2, x2, b2, data->gpr_size, data->gpr[r1]);
+
+ /* STD r1, d2(x2,b2) --- store floating-point register. */
+ else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
+ s390_store (data, d2, x2, b2, data->fpr_size, data->fpr[r1]);
+
+ /* STM r1, r3, d2(b2) --- store multiple. */
+ /* STMY r1, r3, d2(b2) --- store multiple (long-displacement version). */
+ /* STMG r1, r3, d2(b2) --- store multiple (64-bit version). */
+ else if (is_rs (insn32, op_stm, &r1, &r3, &d2, &b2)
+ || is_rsy (insn32, op1_stmy, op2_stmy, &r1, &r3, &d2, &b2)
+ || is_rsy (insn64, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
+ {
+ for (; r1 <= r3; r1++, d2 += data->gpr_size)
+ s390_store (data, d2, 0, b2, data->gpr_size, data->gpr[r1]);
+ }
+
+ /* AHI r1, i2 --- add halfword immediate. */
+ /* AGHI r1, i2 --- add halfword immediate (64-bit version). */
+ /* AFI r1, i2 --- add fullword immediate. */
+ /* AGFI r1, i2 --- add fullword immediate (64-bit version). */
+ else if (is_ri (insn32, op1_ahi, op2_ahi, &r1, &i2)
+ || is_ri (insn64, op1_aghi, op2_aghi, &r1, &i2)
+ || is_ril (insn32, op1_afi, op2_afi, &r1, &i2)
+ || is_ril (insn64, op1_agfi, op2_agfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1], i2);
+
+ /* ALFI r1, i2 --- add logical immediate. */
+ /* ALGFI r1, i2 --- add logical immediate (64-bit version). */
+ else if (is_ril (insn32, op1_alfi, op2_alfi, &r1, &i2)
+ || is_ril (insn64, op1_algfi, op2_algfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1],
+ (CORE_ADDR)i2 & 0xffffffff);
+
+ /* AR r1, r2 -- add register. */
+ /* AGR r1, r2 -- add register (64-bit version). */
+ else if (is_rr (insn32, op_ar, &r1, &r2)
+ || is_rre (insn64, op_agr, &r1, &r2))
+ data->gpr[r1] = pv_add (data->gpr[r1], data->gpr[r2]);
+
+ /* A r1, d2(x2, b2) -- add. */
+ /* AY r1, d2(x2, b2) -- add (long-displacement version). */
+ /* AG r1, d2(x2, b2) -- add (64-bit version). */
+ else if (is_rx (insn32, op_a, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_ay, op2_ay, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_ag, op2_ag, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = pv_add (data->gpr[r1],
+ s390_load (data, d2, x2, b2, data->gpr_size));
+
+ /* SLFI r1, i2 --- subtract logical immediate. */
+ /* SLGFI r1, i2 --- subtract logical immediate (64-bit version). */
+ else if (is_ril (insn32, op1_slfi, op2_slfi, &r1, &i2)
+ || is_ril (insn64, op1_slgfi, op2_slgfi, &r1, &i2))
+ data->gpr[r1] = pv_add_constant (data->gpr[r1],
+ -((CORE_ADDR)i2 & 0xffffffff));
+
+ /* SR r1, r2 -- subtract register. */
+ /* SGR r1, r2 -- subtract register (64-bit version). */
+ else if (is_rr (insn32, op_sr, &r1, &r2)
+ || is_rre (insn64, op_sgr, &r1, &r2))
+ data->gpr[r1] = pv_subtract (data->gpr[r1], data->gpr[r2]);
+
+ /* S r1, d2(x2, b2) -- subtract. */
+ /* SY r1, d2(x2, b2) -- subtract (long-displacement version). */
+ /* SG r1, d2(x2, b2) -- subtract (64-bit version). */
+ else if (is_rx (insn32, op_s, &r1, &d2, &x2, &b2)
+ || is_rxy (insn32, op1_sy, op2_sy, &r1, &d2, &x2, &b2)
+ || is_rxy (insn64, op1_sg, op2_sg, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = pv_subtract (data->gpr[r1],
+ s390_load (data, d2, x2, b2, data->gpr_size));
+
+ /* LA r1, d2(x2, b2) --- load address. */
+ /* LAY r1, d2(x2, b2) --- load address (long-displacement version). */
+ else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)
+ || is_rxy (insn, op1_lay, op2_lay, &r1, &d2, &x2, &b2))
+ data->gpr[r1] = s390_addr (data, d2, x2, b2);
+
+ /* LARL r1, i2 --- load address relative long. */
+ else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
+ data->gpr[r1] = pv_constant (pc + i2 * 2);
+
+ /* BASR r1, 0 --- branch and save.
+ Since r2 is zero, this saves the PC in r1, but doesn't branch. */
+ else if (is_rr (insn, op_basr, &r1, &r2)
+ && r2 == 0)
+ data->gpr[r1] = pv_constant (next_pc);
+
+ /* BRAS r1, i2 --- branch relative and save. */
+ else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))
+ {
+ data->gpr[r1] = pv_constant (next_pc);
+ next_pc = pc + i2 * 2;
+
+ /* We'd better not interpret any backward branches. We'll
+ never terminate. */
+ if (next_pc <= pc)
+ break;
+ }
+
+ /* Terminate search when hitting any other branch instruction. */
+ else if (is_rr (insn, op_basr, &r1, &r2)
+ || is_rx (insn, op_bas, &r1, &d2, &x2, &b2)
+ || is_rr (insn, op_bcr, &r1, &r2)
+ || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
+ || is_ri (insn, op1_brc, op2_brc, &r1, &i2)
+ || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
+ || is_ril (insn, op1_brasl, op2_brasl, &r2, &i2))
+ break;
+
+ else
+ /* An instruction we don't know how to simulate. The only
+ safe thing to do would be to set every value we're tracking
+ to 'unknown'. Instead, we'll be optimistic: we assume that
+ we *can* interpret every instruction that the compiler uses
+ to manipulate any of the data we're interested in here --
+ then we can just ignore anything else. */
+ ;
+
+ /* Record the address after the last instruction that changed
+ the FP, SP, or backlink. Ignore instructions that changed
+ them back to their original values --- those are probably
+ restore instructions. (The back chain is never restored,
+ just popped.) */
+ {
+ pv_t sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ pv_t fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+
+ if ((! pv_is_identical (pre_insn_sp, sp)
+ && ! pv_is_register_k (sp, S390_SP_REGNUM, 0)
+ && sp.kind != pvk_unknown)
+ || (! pv_is_identical (pre_insn_fp, fp)
+ && ! pv_is_register_k (fp, S390_FRAME_REGNUM, 0)
+ && fp.kind != pvk_unknown)
+ || pre_insn_back_chain_saved_p != data->back_chain_saved_p)
+ result = next_pc;
+ }
+ }
+
+ /* Record where all the registers were saved. */
+ pv_area_scan (data->stack, s390_check_for_saved, data);
+
+ free_pv_area (data->stack);
+ data->stack = NULL;
+ return result;
+}
+
+/* Advance PC across any function entry prologue instructions to reach
+ some "real" code. */
+static CORE_ADDR
+s390_skip_prologue (CORE_ADDR pc)
+{
+ struct s390_prologue_data data;
+ CORE_ADDR skip_pc;
+ skip_pc = s390_analyze_prologue (current_gdbarch, pc, (CORE_ADDR)-1, &data);
+ return skip_pc ? skip_pc : pc;
+}
-CORE_ADDR
-s390_function_start (struct frame_info *fi)
+/* Return true if we are in the functin's epilogue, i.e. after the
+ instruction that destroyed the function's stack frame. */
+static int
+s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
- CORE_ADDR function_start = 0;
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
+ /* In frameless functions, there's not frame to destroy and thus
+ we don't care about the epilogue.
+
+ In functions with frame, the epilogue sequence is a pair of
+ a LM-type instruction that restores (amongst others) the
+ return register %r14 and the stack pointer %r15, followed
+ by a branch 'br %r14' --or equivalent-- that effects the
+ actual return.
+
+ In that situation, this function needs to return 'true' in
+ exactly one case: when pc points to that branch instruction.
+
+ Thus we try to disassemble the one instructions immediately
+ preceeding pc and check whether it is an LM-type instruction
+ modifying the stack pointer.
+
+ Note that disassembling backwards is not reliable, so there
+ is a slight chance of false positives here ... */
+
+ bfd_byte insn[6];
+ unsigned int r1, r3, b2;
+ int d2;
+
+ if (word_size == 4
+ && !read_memory_nobpt (pc - 4, insn, 4)
+ && is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
+
+ if (word_size == 4
+ && !read_memory_nobpt (pc - 6, insn, 6)
+ && is_rsy (insn, op1_lmy, op2_lmy, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
+
+ if (word_size == 8
+ && !read_memory_nobpt (pc - 6, insn, 6)
+ && is_rsy (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
- if (fi->extra_info && fi->extra_info->initialised)
- function_start = fi->extra_info->function_start;
- else if (get_frame_pc (fi))
- function_start = get_pc_function_start (get_frame_pc (fi));
- return function_start;
+ return 0;
}
+/* Normal stack frames. */
+
+struct s390_unwind_cache {
+ CORE_ADDR func;
+ CORE_ADDR frame_base;
+ CORE_ADDR local_base;
-int
-s390_frameless_function_invocation (struct frame_info *fi)
+ struct trad_frame_saved_reg *saved_regs;
+};
+
+static int
+s390_prologue_frame_unwind_cache (struct frame_info *next_frame,
+ struct s390_unwind_cache *info)
{
- struct frame_extra_info fextra_info, *fextra_info_ptr;
- int frameless = 0;
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ struct s390_prologue_data data;
+ pv_t *fp = &data.gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+ pv_t *sp = &data.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ int i;
+ CORE_ADDR cfa;
+ CORE_ADDR func;
+ CORE_ADDR result;
+ ULONGEST reg;
+ CORE_ADDR prev_sp;
+ int frame_pointer;
+ int size;
+
+ /* Try to find the function start address. If we can't find it, we don't
+ bother searching for it -- with modern compilers this would be mostly
+ pointless anyway. Trust that we'll either have valid DWARF-2 CFI data
+ or else a valid backchain ... */
+ func = frame_func_unwind (next_frame, NORMAL_FRAME);
+ if (!func)
+ return 0;
+
+ /* Try to analyze the prologue. */
+ result = s390_analyze_prologue (gdbarch, func,
+ frame_pc_unwind (next_frame), &data);
+ if (!result)
+ return 0;
+
+ /* If this was successful, we should have found the instruction that
+ sets the stack pointer register to the previous value of the stack
+ pointer minus the frame size. */
+ if (!pv_is_register (*sp, S390_SP_REGNUM))
+ return 0;
- if (fi->next == NULL) /* no may be frameless */
+ /* A frame size of zero at this point can mean either a real
+ frameless function, or else a failure to find the prologue.
+ Perform some sanity checks to verify we really have a
+ frameless function. */
+ if (sp->k == 0)
{
- if (fi->extra_info)
- fextra_info_ptr = fi->extra_info;
- else
+ /* If the next frame is a NORMAL_FRAME, this frame *cannot* have frame
+ size zero. This is only possible if the next frame is a sentinel
+ frame, a dummy frame, or a signal trampoline frame. */
+ /* FIXME: cagney/2004-05-01: This sanity check shouldn't be
+ needed, instead the code should simpliy rely on its
+ analysis. */
+ if (get_frame_type (next_frame) == NORMAL_FRAME)
+ return 0;
+
+ /* If we really have a frameless function, %r14 must be valid
+ -- in particular, it must point to a different function. */
+ reg = frame_unwind_register_unsigned (next_frame, S390_RETADDR_REGNUM);
+ reg = gdbarch_addr_bits_remove (gdbarch, reg) - 1;
+ if (get_pc_function_start (reg) == func)
{
- fextra_info_ptr = &fextra_info;
- s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- fextra_info_ptr, fi, 1);
+ /* However, there is one case where it *is* valid for %r14
+ to point to the same function -- if this is a recursive
+ call, and we have stopped in the prologue *before* the
+ stack frame was allocated.
+
+ Recognize this case by looking ahead a bit ... */
+
+ struct s390_prologue_data data2;
+ pv_t *sp = &data2.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+
+ if (!(s390_analyze_prologue (gdbarch, func, (CORE_ADDR)-1, &data2)
+ && pv_is_register (*sp, S390_SP_REGNUM)
+ && sp->k != 0))
+ return 0;
}
- frameless = ((fextra_info_ptr->stack_bought == 0));
}
- return frameless;
-}
+ /* OK, we've found valid prologue data. */
+ size = -sp->k;
-static int
-s390_is_sigreturn (CORE_ADDR pc, struct frame_info *sighandler_fi,
- CORE_ADDR *sregs, CORE_ADDR *sigcaller_pc)
-{
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- disassemble_info info;
- int instrlen;
- CORE_ADDR scontext;
- int retval = 0;
- CORE_ADDR orig_sp;
- CORE_ADDR temp_sregs;
-
- scontext = temp_sregs = 0;
-
- info.read_memory_func = dis_asm_read_memory;
- instrlen = s390_readinstruction (instr, pc, &info);
- if (sigcaller_pc)
- *sigcaller_pc = 0;
- if (((instrlen == S390_SYSCALL_SIZE) &&
- (instr[0] == S390_SYSCALL_OPCODE)) &&
- ((instr[1] == s390_NR_sigreturn) || (instr[1] == s390_NR_rt_sigreturn)))
+ /* If the frame pointer originally also holds the same value
+ as the stack pointer, we're probably using it. If it holds
+ some other value -- even a constant offset -- it is most
+ likely used as temp register. */
+ if (pv_is_identical (*sp, *fp))
+ frame_pointer = S390_FRAME_REGNUM;
+ else
+ frame_pointer = S390_SP_REGNUM;
+
+ /* If we've detected a function with stack frame, we'll still have to
+ treat it as frameless if we're currently within the function epilog
+ code at a point where the frame pointer has already been restored.
+ This can only happen in an innermost frame. */
+ /* FIXME: cagney/2004-05-01: This sanity check shouldn't be needed,
+ instead the code should simpliy rely on its analysis. */
+ if (size > 0 && get_frame_type (next_frame) != NORMAL_FRAME)
{
- if (sighandler_fi)
+ /* See the comment in s390_in_function_epilogue_p on why this is
+ not completely reliable ... */
+ if (s390_in_function_epilogue_p (gdbarch, frame_pc_unwind (next_frame)))
{
- if (s390_frameless_function_invocation (sighandler_fi))
- orig_sp = get_frame_base (sighandler_fi);
- else
- orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (get_frame_base (sighandler_fi),
- S390_GPR_SIZE));
- if (orig_sp && sigcaller_pc)
- {
- scontext = orig_sp + S390_SIGNAL_FRAMESIZE;
- if (pc == scontext && instr[1] == s390_NR_rt_sigreturn)
- {
- /* We got a new style rt_signal */
- /* get address of read ucontext->uc_mcontext */
- temp_sregs = orig_sp + (GDB_TARGET_IS_ESAME ?
- S390X_UC_MCONTEXT_OFFSET :
- S390_UC_MCONTEXT_OFFSET);
- }
- else
- {
- /* read sigcontext->sregs */
- temp_sregs = ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (scontext
- +
- (GDB_TARGET_IS_ESAME
- ?
- S390X_SIGCONTEXT_SREGS_OFFSET
- :
- S390_SIGCONTEXT_SREGS_OFFSET),
- S390_GPR_SIZE));
-
- }
- /* read sigregs->psw.addr */
- *sigcaller_pc =
- ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (temp_sregs +
- REGISTER_BYTE
- (S390_PC_REGNUM),
- S390_PSW_ADDR_SIZE));
- }
+ memset (&data, 0, sizeof (data));
+ size = 0;
+ frame_pointer = S390_SP_REGNUM;
}
- retval = 1;
}
- if (sregs)
- *sregs = temp_sregs;
- return retval;
-}
-
-/*
- We need to do something better here but this will keep us out of trouble
- for the moment.
- For some reason the blockframe.c calls us with fi->next->fromleaf
- so this seems of little use to us. */
-CORE_ADDR
-s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi)
-{
- CORE_ADDR sigcaller_pc;
- CORE_ADDR pc = 0;
- if (next_fromleaf)
+
+ /* Once we know the frame register and the frame size, we can unwind
+ the current value of the frame register from the next frame, and
+ add back the frame size to arrive that the previous frame's
+ stack pointer value. */
+ prev_sp = frame_unwind_register_unsigned (next_frame, frame_pointer) + size;
+ cfa = prev_sp + 16*word_size + 32;
+
+ /* Record the addresses of all register spill slots the prologue parser
+ has recognized. Consider only registers defined as call-saved by the
+ ABI; for call-clobbered registers the parser may have recognized
+ spurious stores. */
+
+ for (i = 6; i <= 15; i++)
+ if (data.gpr_slot[i] != 0)
+ info->saved_regs[S390_R0_REGNUM + i].addr = cfa - data.gpr_slot[i];
+
+ switch (tdep->abi)
+ {
+ case ABI_LINUX_S390:
+ if (data.fpr_slot[4] != 0)
+ info->saved_regs[S390_F4_REGNUM].addr = cfa - data.fpr_slot[4];
+ if (data.fpr_slot[6] != 0)
+ info->saved_regs[S390_F6_REGNUM].addr = cfa - data.fpr_slot[6];
+ break;
+
+ case ABI_LINUX_ZSERIES:
+ for (i = 8; i <= 15; i++)
+ if (data.fpr_slot[i] != 0)
+ info->saved_regs[S390_F0_REGNUM + i].addr = cfa - data.fpr_slot[i];
+ break;
+ }
+
+ /* Function return will set PC to %r14. */
+ info->saved_regs[S390_PC_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];
+
+ /* In frameless functions, we unwind simply by moving the return
+ address to the PC. However, if we actually stored to the
+ save area, use that -- we might only think the function frameless
+ because we're in the middle of the prologue ... */
+ if (size == 0
+ && !trad_frame_addr_p (info->saved_regs, S390_PC_REGNUM))
+ {
+ info->saved_regs[S390_PC_REGNUM].realreg = S390_RETADDR_REGNUM;
+ }
+
+ /* Another sanity check: unless this is a frameless function,
+ we should have found spill slots for SP and PC.
+ If not, we cannot unwind further -- this happens e.g. in
+ libc's thread_start routine. */
+ if (size > 0)
{
- pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
- /* fix signal handlers */
+ if (!trad_frame_addr_p (info->saved_regs, S390_SP_REGNUM)
+ || !trad_frame_addr_p (info->saved_regs, S390_PC_REGNUM))
+ prev_sp = -1;
}
- else if (get_next_frame (fi) && get_frame_pc (get_next_frame (fi)))
- pc = s390_frame_saved_pc_nofix (get_next_frame (fi));
- if (pc && get_next_frame (fi) && get_frame_base (get_next_frame (fi))
- && s390_is_sigreturn (pc, get_next_frame (fi), NULL, &sigcaller_pc))
+
+ /* We use the current value of the frame register as local_base,
+ and the top of the register save area as frame_base. */
+ if (prev_sp != -1)
{
- pc = sigcaller_pc;
+ info->frame_base = prev_sp + 16*word_size + 32;
+ info->local_base = prev_sp - size;
}
- return pc;
+
+ info->func = func;
+ return 1;
}
-void
-s390_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+static void
+s390_backchain_frame_unwind_cache (struct frame_info *next_frame,
+ struct s390_unwind_cache *info)
{
- frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
- if (get_frame_pc (fi))
- s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- fi->extra_info, fi, 1);
- else
- s390_memset_extra_info (fi->extra_info);
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ CORE_ADDR backchain;
+ ULONGEST reg;
+ LONGEST sp;
+
+ /* Get the backchain. */
+ reg = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
+ backchain = read_memory_unsigned_integer (reg, word_size);
+
+ /* A zero backchain terminates the frame chain. As additional
+ sanity check, let's verify that the spill slot for SP in the
+ save area pointed to by the backchain in fact links back to
+ the save area. */
+ if (backchain != 0
+ && safe_read_memory_integer (backchain + 15*word_size, word_size, &sp)
+ && (CORE_ADDR)sp == backchain)
+ {
+ /* We don't know which registers were saved, but it will have
+ to be at least %r14 and %r15. This will allow us to continue
+ unwinding, but other prev-frame registers may be incorrect ... */
+ info->saved_regs[S390_SP_REGNUM].addr = backchain + 15*word_size;
+ info->saved_regs[S390_RETADDR_REGNUM].addr = backchain + 14*word_size;
+
+ /* Function return will set PC to %r14. */
+ info->saved_regs[S390_PC_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];
+
+ /* We use the current value of the frame register as local_base,
+ and the top of the register save area as frame_base. */
+ info->frame_base = backchain + 16*word_size + 32;
+ info->local_base = reg;
+ }
+
+ info->func = frame_pc_unwind (next_frame);
}
-/* If saved registers of frame FI are not known yet, read and cache them.
- &FEXTRA_INFOP contains struct frame_extra_info; TDATAP can be NULL,
- in which case the framedata are read. */
+static struct s390_unwind_cache *
+s390_frame_unwind_cache (struct frame_info *next_frame,
+ void **this_prologue_cache)
+{
+ struct s390_unwind_cache *info;
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
+
+ info = FRAME_OBSTACK_ZALLOC (struct s390_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+ info->func = -1;
+ info->frame_base = -1;
+ info->local_base = -1;
+
+ /* Try to use prologue analysis to fill the unwind cache.
+ If this fails, fall back to reading the stack backchain. */
+ if (!s390_prologue_frame_unwind_cache (next_frame, info))
+ s390_backchain_frame_unwind_cache (next_frame, info);
+
+ return info;
+}
-void
-s390_frame_init_saved_regs (struct frame_info *fi)
+static void
+s390_frame_this_id (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (next_frame, this_prologue_cache);
- int quick;
+ if (info->frame_base == -1)
+ return;
- if (get_frame_saved_regs (fi) == NULL)
- {
- /* zalloc memsets the saved regs */
- frame_saved_regs_zalloc (fi);
- if (get_frame_pc (fi))
- {
- quick = (fi->extra_info && fi->extra_info->initialised
- && fi->extra_info->good_prologue);
- s390_get_frame_info (quick ? fi->extra_info->function_start :
- s390_sniff_pc_function_start (get_frame_pc (fi), fi),
- fi->extra_info, fi, !quick);
- }
- }
+ *this_id = frame_id_build (info->frame_base, info->func);
}
-
-
-CORE_ADDR
-s390_frame_args_address (struct frame_info *fi)
+static void
+s390_frame_prev_register (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, gdb_byte *bufferp)
{
-
- /* Apparently gdb already knows gdb_args_offset itself */
- return get_frame_base (fi);
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (next_frame, this_prologue_cache);
+ trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, bufferp);
}
+static const struct frame_unwind s390_frame_unwind = {
+ NORMAL_FRAME,
+ s390_frame_this_id,
+ s390_frame_prev_register
+};
-static CORE_ADDR
-s390_frame_saved_pc_nofix (struct frame_info *fi)
+static const struct frame_unwind *
+s390_frame_sniffer (struct frame_info *next_frame)
{
- if (fi->extra_info && fi->extra_info->saved_pc_valid)
- return fi->extra_info->saved_pc;
+ return &s390_frame_unwind;
+}
- if (deprecated_generic_find_dummy_frame (get_frame_pc (fi),
- get_frame_base (fi)))
- return deprecated_read_register_dummy (get_frame_pc (fi),
- get_frame_base (fi), S390_PC_REGNUM);
- s390_frame_init_saved_regs (fi);
- if (fi->extra_info)
- {
- fi->extra_info->saved_pc_valid = 1;
- if (fi->extra_info->good_prologue
- && get_frame_saved_regs (fi)[S390_RETADDR_REGNUM])
- fi->extra_info->saved_pc
- = ADDR_BITS_REMOVE (read_memory_integer
- (get_frame_saved_regs (fi)[S390_RETADDR_REGNUM],
- S390_GPR_SIZE));
- else
- fi->extra_info->saved_pc
- = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
- return fi->extra_info->saved_pc;
- }
- return 0;
-}
+/* Code stubs and their stack frames. For things like PLTs and NULL
+ function calls (where there is no true frame and the return address
+ is in the RETADDR register). */
-CORE_ADDR
-s390_frame_saved_pc (struct frame_info *fi)
+struct s390_stub_unwind_cache
{
- CORE_ADDR saved_pc = 0, sig_pc;
+ CORE_ADDR frame_base;
+ struct trad_frame_saved_reg *saved_regs;
+};
- if (fi->extra_info && fi->extra_info->sig_fixed_saved_pc_valid)
- return fi->extra_info->sig_fixed_saved_pc;
- saved_pc = s390_frame_saved_pc_nofix (fi);
+static struct s390_stub_unwind_cache *
+s390_stub_frame_unwind_cache (struct frame_info *next_frame,
+ void **this_prologue_cache)
+{
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ struct s390_stub_unwind_cache *info;
+ ULONGEST reg;
- if (fi->extra_info)
- {
- fi->extra_info->sig_fixed_saved_pc_valid = 1;
- if (saved_pc)
- {
- if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc))
- saved_pc = sig_pc;
- }
- fi->extra_info->sig_fixed_saved_pc = saved_pc;
- }
- return saved_pc;
-}
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
+ info = FRAME_OBSTACK_ZALLOC (struct s390_stub_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+ /* The return address is in register %r14. */
+ info->saved_regs[S390_PC_REGNUM].realreg = S390_RETADDR_REGNUM;
+ /* Retrieve stack pointer and determine our frame base. */
+ reg = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
+ info->frame_base = reg + 16*word_size + 32;
-/* We want backtraces out of signal handlers so we don't set
- (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */
+ return info;
+}
-CORE_ADDR
-s390_frame_chain (struct frame_info *thisframe)
+static void
+s390_stub_frame_this_id (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
{
- CORE_ADDR prev_fp = 0;
+ struct s390_stub_unwind_cache *info
+ = s390_stub_frame_unwind_cache (next_frame, this_prologue_cache);
+ *this_id = frame_id_build (info->frame_base, frame_pc_unwind (next_frame));
+}
- if (deprecated_generic_find_dummy_frame (get_frame_pc (thisframe),
- get_frame_base (thisframe)))
- return deprecated_read_register_dummy (get_frame_pc (thisframe),
- get_frame_base (thisframe),
- S390_SP_REGNUM);
- else
- {
- int sigreturn = 0;
- CORE_ADDR sregs = 0;
- struct frame_extra_info prev_fextra_info;
+static void
+s390_stub_frame_prev_register (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, gdb_byte *bufferp)
+{
+ struct s390_stub_unwind_cache *info
+ = s390_stub_frame_unwind_cache (next_frame, this_prologue_cache);
+ trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, bufferp);
+}
- memset (&prev_fextra_info, 0, sizeof (prev_fextra_info));
- if (get_frame_pc (thisframe))
- {
- CORE_ADDR saved_pc, sig_pc;
+static const struct frame_unwind s390_stub_frame_unwind = {
+ NORMAL_FRAME,
+ s390_stub_frame_this_id,
+ s390_stub_frame_prev_register
+};
- saved_pc = s390_frame_saved_pc_nofix (thisframe);
- if (saved_pc)
- {
- if ((sigreturn =
- s390_is_sigreturn (saved_pc, thisframe, &sregs, &sig_pc)))
- saved_pc = sig_pc;
- s390_get_frame_info (s390_sniff_pc_function_start
- (saved_pc, NULL), &prev_fextra_info, NULL,
- 1);
- }
- }
- if (sigreturn)
- {
- /* read sigregs,regs.gprs[11 or 15] */
- prev_fp = read_memory_integer (sregs +
- REGISTER_BYTE (S390_GP0_REGNUM +
- (prev_fextra_info.
- frame_pointer_saved_pc
- ? 11 : 15)),
- S390_GPR_SIZE);
- thisframe->extra_info->sigcontext = sregs;
- }
- else
- {
- if (get_frame_saved_regs (thisframe))
- {
- int regno;
-
- if (prev_fextra_info.frame_pointer_saved_pc
- && get_frame_saved_regs (thisframe)[S390_FRAME_REGNUM])
- regno = S390_FRAME_REGNUM;
- else
- regno = S390_SP_REGNUM;
-
- if (get_frame_saved_regs (thisframe)[regno])
- {
- /* The SP's entry of `saved_regs' is special. */
- if (regno == S390_SP_REGNUM)
- prev_fp = get_frame_saved_regs (thisframe)[regno];
- else
- prev_fp =
- read_memory_integer (get_frame_saved_regs (thisframe)[regno],
- S390_GPR_SIZE);
- }
- }
- }
- }
- return ADDR_BITS_REMOVE (prev_fp);
+static const struct frame_unwind *
+s390_stub_frame_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR addr_in_block;
+ bfd_byte insn[S390_MAX_INSTR_SIZE];
+
+ /* If the current PC points to non-readable memory, we assume we
+ have trapped due to an invalid function pointer call. We handle
+ the non-existing current function like a PLT stub. */
+ addr_in_block = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
+ if (in_plt_section (addr_in_block, NULL)
+ || s390_readinstruction (insn, frame_pc_unwind (next_frame)) < 0)
+ return &s390_stub_frame_unwind;
+ return NULL;
}
-/*
- Whether struct frame_extra_info is actually needed I'll have to figure
- out as our frames are similar to rs6000 there is a possibility
- i386 dosen't need it. */
+/* Signal trampoline stack frames. */
+struct s390_sigtramp_unwind_cache {
+ CORE_ADDR frame_base;
+ struct trad_frame_saved_reg *saved_regs;
+};
-/* a given return value in `regbuf' with a type `valtype', extract and copy its
- value into `valbuf' */
-void
-s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
+static struct s390_sigtramp_unwind_cache *
+s390_sigtramp_frame_unwind_cache (struct frame_info *next_frame,
+ void **this_prologue_cache)
{
- /* floats and doubles are returned in fpr0. fpr's have a size of 8 bytes.
- We need to truncate the return value into float size (4 byte) if
- necessary. */
- int len = TYPE_LENGTH (valtype);
+ struct gdbarch *gdbarch = get_frame_arch (next_frame);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ struct s390_sigtramp_unwind_cache *info;
+ ULONGEST this_sp, prev_sp;
+ CORE_ADDR next_ra, next_cfa, sigreg_ptr;
+ int i;
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- memcpy (valbuf, ®buf[REGISTER_BYTE (S390_FP0_REGNUM)], len);
- else
- {
- int offset = 0;
- /* return value is copied starting from r2. */
- if (TYPE_LENGTH (valtype) < S390_GPR_SIZE)
- offset = S390_GPR_SIZE - TYPE_LENGTH (valtype);
- memcpy (valbuf,
- regbuf + REGISTER_BYTE (S390_GP0_REGNUM + 2) + offset,
- TYPE_LENGTH (valtype));
- }
-}
+ if (*this_prologue_cache)
+ return *this_prologue_cache;
+ info = FRAME_OBSTACK_ZALLOC (struct s390_sigtramp_unwind_cache);
+ *this_prologue_cache = info;
+ info->saved_regs = trad_frame_alloc_saved_regs (next_frame);
-static char *
-s390_promote_integer_argument (struct type *valtype, char *valbuf,
- char *reg_buff, int *arglen)
-{
- char *value = valbuf;
- int len = TYPE_LENGTH (valtype);
+ this_sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
+ next_ra = frame_pc_unwind (next_frame);
+ next_cfa = this_sp + 16*word_size + 32;
- if (len < S390_GPR_SIZE)
+ /* New-style RT frame:
+ retcode + alignment (8 bytes)
+ siginfo (128 bytes)
+ ucontext (contains sigregs at offset 5 words) */
+ if (next_ra == next_cfa)
{
- /* We need to upgrade this value to a register to pass it correctly */
- int idx, diff = S390_GPR_SIZE - len, negative =
- (!TYPE_UNSIGNED (valtype) && value[0] & 0x80);
- for (idx = 0; idx < S390_GPR_SIZE; idx++)
- {
- reg_buff[idx] = (idx < diff ? (negative ? 0xff : 0x0) :
- value[idx - diff]);
- }
- value = reg_buff;
- *arglen = S390_GPR_SIZE;
+ sigreg_ptr = next_cfa + 8 + 128 + align_up (5*word_size, 8);
}
+
+ /* Old-style RT frame and all non-RT frames:
+ old signal mask (8 bytes)
+ pointer to sigregs */
else
{
- if (len & (S390_GPR_SIZE - 1))
- {
- fprintf_unfiltered (gdb_stderr,
- "s390_promote_integer_argument detected an argument not "
- "a multiple of S390_GPR_SIZE & greater than S390_GPR_SIZE "
- "we might not deal with this correctly.\n");
- }
- *arglen = len;
+ sigreg_ptr = read_memory_unsigned_integer (next_cfa + 8, word_size);
}
- return (value);
-}
+ /* The sigregs structure looks like this:
+ long psw_mask;
+ long psw_addr;
+ long gprs[16];
+ int acrs[16];
+ int fpc;
+ int __pad;
+ double fprs[16]; */
-void
-s390_store_return_value (struct type *valtype, char *valbuf)
-{
- int arglen;
- char *reg_buff = alloca (max (S390_FPR_SIZE, REGISTER_SIZE)), *value;
+ /* Let's ignore the PSW mask, it will not be restored anyway. */
+ sigreg_ptr += word_size;
+
+ /* Next comes the PSW address. */
+ info->saved_regs[S390_PC_REGNUM].addr = sigreg_ptr;
+ sigreg_ptr += word_size;
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
+ /* Then the GPRs. */
+ for (i = 0; i < 16; i++)
{
- if (TYPE_LENGTH (valtype) == 4
- || TYPE_LENGTH (valtype) == 8)
- deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM),
- valbuf, TYPE_LENGTH (valtype));
- else
- error ("GDB is unable to return `long double' values "
- "on this architecture.");
+ info->saved_regs[S390_R0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += word_size;
}
- else
+
+ /* Then the ACRs. */
+ for (i = 0; i < 16; i++)
{
- value =
- s390_promote_integer_argument (valtype, valbuf, reg_buff, &arglen);
- /* Everything else is returned in GPR2 and up. */
- deprecated_write_register_bytes (REGISTER_BYTE (S390_GP0_REGNUM + 2),
- value, arglen);
+ info->saved_regs[S390_A0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += 4;
}
-}
-static int
-gdb_print_insn_s390 (bfd_vma memaddr, disassemble_info * info)
-{
- bfd_byte instrbuff[S390_MAX_INSTR_SIZE];
- int instrlen, cnt;
- instrlen = s390_readinstruction (instrbuff, (CORE_ADDR) memaddr, info);
- if (instrlen < 0)
+ /* The floating-point control word. */
+ info->saved_regs[S390_FPC_REGNUM].addr = sigreg_ptr;
+ sigreg_ptr += 8;
+
+ /* And finally the FPRs. */
+ for (i = 0; i < 16; i++)
{
- (*info->memory_error_func) (instrlen, memaddr, info);
- return -1;
+ info->saved_regs[S390_F0_REGNUM + i].addr = sigreg_ptr;
+ sigreg_ptr += 8;
}
- for (cnt = 0; cnt < instrlen; cnt++)
- info->fprintf_func (info->stream, "%02X ", instrbuff[cnt]);
- for (cnt = instrlen; cnt < S390_MAX_INSTR_SIZE; cnt++)
- info->fprintf_func (info->stream, " ");
- instrlen = print_insn_s390 (memaddr, info);
- return instrlen;
+
+ /* Restore the previous frame's SP. */
+ prev_sp = read_memory_unsigned_integer (
+ info->saved_regs[S390_SP_REGNUM].addr,
+ word_size);
+
+ /* Determine our frame base. */
+ info->frame_base = prev_sp + 16*word_size + 32;
+
+ return info;
+}
+
+static void
+s390_sigtramp_frame_this_id (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ struct frame_id *this_id)
+{
+ struct s390_sigtramp_unwind_cache *info
+ = s390_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
+ *this_id = frame_id_build (info->frame_base, frame_pc_unwind (next_frame));
+}
+
+static void
+s390_sigtramp_frame_prev_register (struct frame_info *next_frame,
+ void **this_prologue_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, gdb_byte *bufferp)
+{
+ struct s390_sigtramp_unwind_cache *info
+ = s390_sigtramp_frame_unwind_cache (next_frame, this_prologue_cache);
+ trad_frame_get_prev_register (next_frame, info->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, bufferp);
+}
+
+static const struct frame_unwind s390_sigtramp_frame_unwind = {
+ SIGTRAMP_FRAME,
+ s390_sigtramp_frame_this_id,
+ s390_sigtramp_frame_prev_register
+};
+
+static const struct frame_unwind *
+s390_sigtramp_frame_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ bfd_byte sigreturn[2];
+
+ if (read_memory_nobpt (pc, sigreturn, 2))
+ return NULL;
+
+ if (sigreturn[0] != 0x0a /* svc */)
+ return NULL;
+
+ if (sigreturn[1] != 119 /* sigreturn */
+ && sigreturn[1] != 173 /* rt_sigreturn */)
+ return NULL;
+
+ return &s390_sigtramp_frame_unwind;
}
+/* Frame base handling. */
+
+static CORE_ADDR
+s390_frame_base_address (struct frame_info *next_frame, void **this_cache)
+{
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (next_frame, this_cache);
+ return info->frame_base;
+}
-/* Not the most efficent code in the world */
-int
-s390_fp_regnum (void)
+static CORE_ADDR
+s390_local_base_address (struct frame_info *next_frame, void **this_cache)
{
- int regno = S390_SP_REGNUM;
- struct frame_extra_info fextra_info;
+ struct s390_unwind_cache *info
+ = s390_frame_unwind_cache (next_frame, this_cache);
+ return info->local_base;
+}
- CORE_ADDR pc = ADDR_BITS_REMOVE (read_register (S390_PC_REGNUM));
+static const struct frame_base s390_frame_base = {
+ &s390_frame_unwind,
+ s390_frame_base_address,
+ s390_local_base_address,
+ s390_local_base_address
+};
- s390_get_frame_info (s390_sniff_pc_function_start (pc, NULL), &fextra_info,
- NULL, 1);
- if (fextra_info.frame_pointer_saved_pc)
- regno = S390_FRAME_REGNUM;
- return regno;
+static CORE_ADDR
+s390_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
+{
+ ULONGEST pc;
+ pc = frame_unwind_register_unsigned (next_frame, S390_PC_REGNUM);
+ return gdbarch_addr_bits_remove (gdbarch, pc);
}
-CORE_ADDR
-s390_read_fp (void)
+static CORE_ADDR
+s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- return read_register (s390_fp_regnum ());
+ ULONGEST sp;
+ sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
+ return gdbarch_addr_bits_remove (gdbarch, sp);
}
+/* DWARF-2 frame support. */
+
static void
-s390_pop_frame_regular (struct frame_info *frame)
+s390_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
+ struct dwarf2_frame_state_reg *reg,
+ struct frame_info *next_frame)
{
- int regnum;
-
- write_register (S390_PC_REGNUM, FRAME_SAVED_PC (frame));
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Restore any saved registers. */
- if (get_frame_saved_regs (frame))
+ switch (tdep->abi)
{
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (get_frame_saved_regs (frame)[regnum] != 0)
- {
- ULONGEST value;
-
- value = read_memory_unsigned_integer (get_frame_saved_regs (frame)[regnum],
- REGISTER_RAW_SIZE (regnum));
- write_register (regnum, value);
- }
-
- /* Actually cut back the stack. Remember that the SP's element of
- saved_regs is the old SP itself, not the address at which it is
- saved. */
- write_register (S390_SP_REGNUM, get_frame_saved_regs (frame)[S390_SP_REGNUM]);
- }
+ case ABI_LINUX_S390:
+ /* Call-saved registers. */
+ if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
+ || regnum == S390_F4_REGNUM
+ || regnum == S390_F6_REGNUM)
+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
+
+ /* Call-clobbered registers. */
+ else if ((regnum >= S390_R0_REGNUM && regnum <= S390_R5_REGNUM)
+ || (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM
+ && regnum != S390_F4_REGNUM && regnum != S390_F6_REGNUM))
+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
+
+ /* The return address column. */
+ else if (regnum == S390_PC_REGNUM)
+ reg->how = DWARF2_FRAME_REG_RA;
+ break;
- /* Throw away any cached frame information. */
- flush_cached_frames ();
-}
+ case ABI_LINUX_ZSERIES:
+ /* Call-saved registers. */
+ if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
+ || (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM))
+ reg->how = DWARF2_FRAME_REG_SAME_VALUE;
+ /* Call-clobbered registers. */
+ else if ((regnum >= S390_R0_REGNUM && regnum <= S390_R5_REGNUM)
+ || (regnum >= S390_F0_REGNUM && regnum <= S390_F7_REGNUM))
+ reg->how = DWARF2_FRAME_REG_UNDEFINED;
-/* Destroy the innermost (Top-Of-Stack) stack frame, restoring the
- machine state that was in effect before the frame was created.
- Used in the contexts of the "return" command, and of
- target function calls from the debugger. */
-void
-s390_pop_frame (void)
-{
- /* This function checks for and handles generic dummy frames, and
- calls back to our function for ordinary frames. */
- generic_pop_current_frame (s390_pop_frame_regular);
+ /* The return address column. */
+ else if (regnum == S390_PC_REGNUM)
+ reg->how = DWARF2_FRAME_REG_RA;
+ break;
+ }
}
+/* Dummy function calls. */
+
/* Return non-zero if TYPE is an integer-like type, zero otherwise.
"Integer-like" types are those that should be passed the way
integers are: integers, enums, ranges, characters, and booleans. */
|| code == TYPE_CODE_BOOL);
}
-
/* Return non-zero if TYPE is a pointer-like type, zero otherwise.
"Pointer-like" types are those that should be passed the way
pointers are: pointers and references. */
... and so on.
- WHY THE HECK DO WE CARE ABOUT THIS??? Well, it turns out that GCC
- passes all float singletons and double singletons as if they were
- simply floats or doubles. This is *not* what the ABI says it
- should do. */
+ All such structures are passed as if they were floats or doubles,
+ as the (revised) ABI says. */
static int
is_float_singleton (struct type *type)
{
- return (TYPE_CODE (type) == TYPE_CODE_STRUCT
- && TYPE_NFIELDS (type) == 1
- && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_FLT
- || is_float_singleton (TYPE_FIELD_TYPE (type, 0))));
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)
+ {
+ struct type *singleton_type = TYPE_FIELD_TYPE (type, 0);
+ CHECK_TYPEDEF (singleton_type);
+
+ return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT
+ || is_float_singleton (singleton_type));
+ }
+
+ return 0;
}
You'd think this would just be floats, doubles, long doubles, etc.
But as an odd quirk, not mentioned in the ABI, GCC passes float and
double singletons as if they were a plain float, double, etc. (The
- corresponding union types are handled normally.) So we exclude
+ corresponding union types are handled normally.) So we include
those types here. *shrug* */
static int
is_float_like (struct type *type)
}
-/* Return non-zero if TYPE is considered a `DOUBLE_OR_FLOAT', as
- defined by the parameter passing conventions described in the
- "GNU/Linux for S/390 ELF Application Binary Interface Supplement".
- Otherwise, return zero. */
static int
-is_double_or_float (struct type *type)
+is_power_of_two (unsigned int n)
{
- return (is_float_like (type)
- && (TYPE_LENGTH (type) == 4
- || TYPE_LENGTH (type) == 8));
+ return ((n & (n - 1)) == 0);
}
-
-/* Return non-zero if TYPE is considered a `SIMPLE_ARG', as defined by
- the parameter passing conventions described in the "GNU/Linux for
- S/390 ELF Application Binary Interface Supplement". Return zero
- otherwise. */
+/* Return non-zero if TYPE should be passed as a pointer to a copy,
+ zero otherwise. */
static int
-is_simple_arg (struct type *type)
+s390_function_arg_pass_by_reference (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 1;
- /* This is almost a direct translation of the ABI's language, except
- that we have to exclude 8-byte structs; those are DOUBLE_ARGs. */
- return ((is_integer_like (type) && length <= 4)
- || is_pointer_like (type)
- || (is_struct_like (type) && length != 8)
- || (is_float_like (type) && length == 16));
+ /* FIXME: All complex and vector types are also returned by reference. */
+ return is_struct_like (type) && !is_power_of_two (length);
}
-
-/* Return non-zero if TYPE should be passed as a pointer to a copy,
- zero otherwise. TYPE must be a SIMPLE_ARG, as recognized by
- `is_simple_arg'. */
+/* Return non-zero if TYPE should be passed in a float register
+ if possible. */
static int
-pass_by_copy_ref (struct type *type)
+s390_function_arg_float (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 0;
- return ((is_struct_like (type) && length != 1 && length != 2 && length != 4)
- || (is_float_like (type) && length == 16));
+ return is_float_like (type);
}
+/* Return non-zero if TYPE should be passed in an integer register
+ (or a pair of integer registers) if possible. */
+static int
+s390_function_arg_integer (struct type *type)
+{
+ unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 0;
+
+ return is_integer_like (type)
+ || is_pointer_like (type)
+ || (is_struct_like (type) && is_power_of_two (length));
+}
/* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
word as required for the ABI. */
static LONGEST
extend_simple_arg (struct value *arg)
{
- struct type *type = VALUE_TYPE (arg);
+ struct type *type = value_type (arg);
/* Even structs get passed in the least significant bits of the
register / memory word. It's not really right to extract them as
an integer, but it does take care of the extension. */
if (TYPE_UNSIGNED (type))
- return extract_unsigned_integer (VALUE_CONTENTS (arg),
+ return extract_unsigned_integer (value_contents (arg),
TYPE_LENGTH (type));
else
- return extract_signed_integer (VALUE_CONTENTS (arg),
+ return extract_signed_integer (value_contents (arg),
TYPE_LENGTH (type));
}
-/* Return non-zero if TYPE is a `DOUBLE_ARG', as defined by the
- parameter passing conventions described in the "GNU/Linux for S/390
- ELF Application Binary Interface Supplement". Return zero
- otherwise. */
-static int
-is_double_arg (struct type *type)
-{
- unsigned length = TYPE_LENGTH (type);
-
- return ((is_integer_like (type)
- || is_struct_like (type))
- && length == 8);
-}
-
-
-/* Round ADDR up to the next N-byte boundary. N must be a power of
- two. */
-static CORE_ADDR
-round_up (CORE_ADDR addr, int n)
-{
- /* Check that N is really a power of two. */
- gdb_assert (n && (n & (n-1)) == 0);
- return ((addr + n - 1) & -n);
-}
-
-
-/* Round ADDR down to the next N-byte boundary. N must be a power of
- two. */
-static CORE_ADDR
-round_down (CORE_ADDR addr, int n)
-{
- /* Check that N is really a power of two. */
- gdb_assert (n && (n & (n-1)) == 0);
- return (addr & -n);
-}
-
-
/* Return the alignment required by TYPE. */
static int
alignment_of (struct type *type)
Our caller has taken care of any type promotions needed to satisfy
prototypes or the old K&R argument-passing rules. */
-CORE_ADDR
-s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+static CORE_ADDR
+s390_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ ULONGEST orig_sp;
int i;
- int pointer_size = (TARGET_PTR_BIT / TARGET_CHAR_BIT);
-
- /* The number of arguments passed by reference-to-copy. */
- int num_copies;
/* If the i'th argument is passed as a reference to a copy, then
copy_addr[i] is the address of the copy we made. */
CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));
/* Build the reference-to-copy area. */
- num_copies = 0;
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
+ struct type *type = value_type (arg);
unsigned length = TYPE_LENGTH (type);
- if (is_simple_arg (type)
- && pass_by_copy_ref (type))
+ if (s390_function_arg_pass_by_reference (type))
{
sp -= length;
- sp = round_down (sp, alignment_of (type));
- write_memory (sp, VALUE_CONTENTS (arg), length);
+ sp = align_down (sp, alignment_of (type));
+ write_memory (sp, value_contents (arg), length);
copy_addr[i] = sp;
- num_copies++;
}
}
/* Reserve space for the parameter area. As a conservative
simplification, we assume that everything will be passed on the
- stack. */
- {
- int i;
-
- for (i = 0; i < nargs; i++)
- {
- struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
- int length = TYPE_LENGTH (type);
-
- sp = round_down (sp, alignment_of (type));
-
- /* SIMPLE_ARG values get extended to 32 bits. Assume every
- argument is. */
- if (length < 4) length = 4;
- sp -= length;
- }
- }
+ stack. Since every argument larger than 8 bytes will be
+ passed by reference, we use this simple upper bound. */
+ sp -= nargs * 8;
- /* Include space for any reference-to-copy pointers. */
- sp = round_down (sp, pointer_size);
- sp -= num_copies * pointer_size;
-
/* After all that, make sure it's still aligned on an eight-byte
boundary. */
- sp = round_down (sp, 8);
+ sp = align_down (sp, 8);
/* Finally, place the actual parameters, working from SP towards
higher addresses. The code above is supposed to reserve enough
int gr = 2;
CORE_ADDR starg = sp;
+ /* A struct is returned using general register 2. */
+ if (struct_return)
+ {
+ regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+ struct_addr);
+ gr++;
+ }
+
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
-
- if (is_double_or_float (type)
- && fr <= 2)
- {
- /* When we store a single-precision value in an FP register,
- it occupies the leftmost bits. */
- deprecated_write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM + fr),
- VALUE_CONTENTS (arg),
- TYPE_LENGTH (type));
- fr += 2;
- }
- else if (is_simple_arg (type)
- && gr <= 6)
- {
- /* Do we need to pass a pointer to our copy of this
- argument? */
- if (pass_by_copy_ref (type))
- write_register (S390_GP0_REGNUM + gr, copy_addr[i]);
- else
- write_register (S390_GP0_REGNUM + gr, extend_simple_arg (arg));
-
- gr++;
- }
- else if (is_double_arg (type)
- && gr <= 5)
- {
- deprecated_write_register_gen (S390_GP0_REGNUM + gr,
- VALUE_CONTENTS (arg));
- deprecated_write_register_gen (S390_GP0_REGNUM + gr + 1,
- VALUE_CONTENTS (arg) + 4);
- gr += 2;
- }
- else
- {
- /* The `OTHER' case. */
- enum type_code code = TYPE_CODE (type);
- unsigned length = TYPE_LENGTH (type);
-
- /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
- in it, then don't go back and use it again later. */
- if (is_double_arg (type) && gr == 6)
- gr = 7;
-
- if (is_simple_arg (type))
- {
- /* Simple args are always either extended to 32 bits,
- or pointers. */
- starg = round_up (starg, 4);
-
- /* Do we need to pass a pointer to our copy of this
- argument? */
- if (pass_by_copy_ref (type))
- write_memory_signed_integer (starg, pointer_size,
- copy_addr[i]);
- else
- /* Simple args are always extended to 32 bits. */
- write_memory_signed_integer (starg, 4,
- extend_simple_arg (arg));
- starg += 4;
- }
- else
- {
- /* You'd think we should say:
- starg = round_up (starg, alignment_of (type));
- Unfortunately, GCC seems to simply align the stack on
- a four-byte boundary, even when passing doubles. */
- starg = round_up (starg, 4);
- write_memory (starg, VALUE_CONTENTS (arg), length);
- starg += length;
- }
- }
+ struct type *type = value_type (arg);
+ unsigned length = TYPE_LENGTH (type);
+
+ if (s390_function_arg_pass_by_reference (type))
+ {
+ if (gr <= 6)
+ {
+ regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+ copy_addr[i]);
+ gr++;
+ }
+ else
+ {
+ write_memory_unsigned_integer (starg, word_size, copy_addr[i]);
+ starg += word_size;
+ }
+ }
+ else if (s390_function_arg_float (type))
+ {
+ /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments,
+ the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6. */
+ if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr,
+ 0, length, value_contents (arg));
+ fr += 2;
+ }
+ else
+ {
+ /* When we store a single-precision value in a stack slot,
+ it occupies the rightmost bits. */
+ starg = align_up (starg + length, word_size);
+ write_memory (starg - length, value_contents (arg), length);
+ }
+ }
+ else if (s390_function_arg_integer (type) && length <= word_size)
+ {
+ if (gr <= 6)
+ {
+ /* Integer arguments are always extended to word size. */
+ regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr,
+ extend_simple_arg (arg));
+ gr++;
+ }
+ else
+ {
+ /* Integer arguments are always extended to word size. */
+ write_memory_signed_integer (starg, word_size,
+ extend_simple_arg (arg));
+ starg += word_size;
+ }
+ }
+ else if (s390_function_arg_integer (type) && length == 2*word_size)
+ {
+ if (gr <= 5)
+ {
+ regcache_cooked_write (regcache, S390_R0_REGNUM + gr,
+ value_contents (arg));
+ regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1,
+ value_contents (arg) + word_size);
+ gr += 2;
+ }
+ else
+ {
+ /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
+ in it, then don't go back and use it again later. */
+ gr = 7;
+
+ write_memory (starg, value_contents (arg), length);
+ starg += length;
+ }
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("unknown argument type"));
}
}
/* Allocate the standard frame areas: the register save area, the
word reserved for the compiler (which seems kind of meaningless),
and the back chain pointer. */
- sp -= 96;
+ sp -= 16*word_size + 32;
- /* Write the back chain pointer into the first word of the stack
- frame. This will help us get backtraces from within functions
- called from GDB. */
- write_memory_unsigned_integer (sp, (TARGET_PTR_BIT / TARGET_CHAR_BIT),
- read_fp ());
+ /* Store return address. */
+ regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);
+
+ /* Store updated stack pointer. */
+ regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp);
- return sp;
+ /* We need to return the 'stack part' of the frame ID,
+ which is actually the top of the register save area. */
+ return sp + 16*word_size + 32;
}
-
-static int
-s390_use_struct_convention (int gcc_p, struct type *value_type)
+/* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
+ dummy frame. The frame ID's base needs to match the TOS value
+ returned by push_dummy_call, and the PC match the dummy frame's
+ breakpoint. */
+static struct frame_id
+s390_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- enum type_code code = TYPE_CODE (value_type);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ CORE_ADDR sp = s390_unwind_sp (gdbarch, next_frame);
- return (code == TYPE_CODE_STRUCT
- || code == TYPE_CODE_UNION);
+ return frame_id_build (sp + 16*word_size + 32,
+ frame_pc_unwind (next_frame));
}
-
-/* Return the GDB type object for the "standard" data type
- of data in register N. */
-struct type *
-s390_register_virtual_type (int regno)
+static CORE_ADDR
+s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
{
- if (S390_FP0_REGNUM <= regno && regno < S390_FP0_REGNUM + S390_NUM_FPRS)
- return builtin_type_double;
- else
- return builtin_type_int;
+ /* Both the 32- and 64-bit ABI's say that the stack pointer should
+ always be aligned on an eight-byte boundary. */
+ return (addr & -8);
}
-struct type *
-s390x_register_virtual_type (int regno)
+/* Function return value access. */
+
+static enum return_value_convention
+s390_return_value_convention (struct gdbarch *gdbarch, struct type *type)
{
- return (regno == S390_FPC_REGNUM) ||
- (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR) ? builtin_type_int :
- (regno >= S390_FP0_REGNUM) ? builtin_type_double : builtin_type_long;
-}
+ int length = TYPE_LENGTH (type);
+ if (length > 8)
+ return RETURN_VALUE_STRUCT_CONVENTION;
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ case TYPE_CODE_ARRAY:
+ return RETURN_VALUE_STRUCT_CONVENTION;
+ default:
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+}
-void
-s390_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+static enum return_value_convention
+s390_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, gdb_byte *out,
+ const gdb_byte *in)
{
- write_register (S390_GP0_REGNUM + 2, addr);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ int length = TYPE_LENGTH (type);
+ enum return_value_convention rvc =
+ s390_return_value_convention (gdbarch, type);
+ if (in)
+ {
+ switch (rvc)
+ {
+ case RETURN_VALUE_REGISTER_CONVENTION:
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_write_part (regcache, S390_F0_REGNUM,
+ 0, length, in);
+ }
+ else if (length <= word_size)
+ {
+ /* Integer arguments are always extended to word size. */
+ if (TYPE_UNSIGNED (type))
+ regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM,
+ extract_unsigned_integer (in, length));
+ else
+ regcache_cooked_write_signed (regcache, S390_R2_REGNUM,
+ extract_signed_integer (in, length));
+ }
+ else if (length == 2*word_size)
+ {
+ regcache_cooked_write (regcache, S390_R2_REGNUM, in);
+ regcache_cooked_write (regcache, S390_R3_REGNUM, in + word_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("invalid return type"));
+ break;
+
+ case RETURN_VALUE_STRUCT_CONVENTION:
+ error (_("Cannot set function return value."));
+ break;
+ }
+ }
+ else if (out)
+ {
+ switch (rvc)
+ {
+ case RETURN_VALUE_REGISTER_CONVENTION:
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_read_part (regcache, S390_F0_REGNUM,
+ 0, length, out);
+ }
+ else if (length <= word_size)
+ {
+ /* Integer arguments occupy the rightmost bits. */
+ regcache_cooked_read_part (regcache, S390_R2_REGNUM,
+ word_size - length, length, out);
+ }
+ else if (length == 2*word_size)
+ {
+ regcache_cooked_read (regcache, S390_R2_REGNUM, out);
+ regcache_cooked_read (regcache, S390_R3_REGNUM, out + word_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__, _("invalid return type"));
+ break;
+
+ case RETURN_VALUE_STRUCT_CONVENTION:
+ error (_("Function return value unknown."));
+ break;
+ }
+ }
+
+ return rvc;
}
+/* Breakpoints. */
-const static unsigned char *
+static const gdb_byte *
s390_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
{
- static unsigned char breakpoint[] = { 0x0, 0x1 };
+ static const gdb_byte breakpoint[] = { 0x0, 0x1 };
*lenptr = sizeof (breakpoint);
return breakpoint;
}
-/* Advance PC across any function entry prologue instructions to reach some
- "real" code. */
-CORE_ADDR
-s390_skip_prologue (CORE_ADDR pc)
-{
- struct frame_extra_info fextra_info;
- s390_get_frame_info (pc, &fextra_info, NULL, 1);
- return fextra_info.skip_prologue_function_start;
-}
+/* Address handling. */
-/* Immediately after a function call, return the saved pc.
- Can't go through the frames for this because on some machines
- the new frame is not set up until the new function executes
- some instructions. */
-CORE_ADDR
-s390_saved_pc_after_call (struct frame_info *frame)
+static CORE_ADDR
+s390_addr_bits_remove (CORE_ADDR addr)
{
- return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
+ return addr & 0x7fffffff;
}
-static CORE_ADDR
-s390_addr_bits_remove (CORE_ADDR addr)
+static int
+s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
{
- return (addr) & 0x7fffffff;
+ if (byte_size == 4)
+ return TYPE_FLAG_ADDRESS_CLASS_1;
+ else
+ return 0;
}
+static const char *
+s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
+{
+ if (type_flags & TYPE_FLAG_ADDRESS_CLASS_1)
+ return "mode32";
+ else
+ return NULL;
+}
-static CORE_ADDR
-s390_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+static int
+s390_address_class_name_to_type_flags (struct gdbarch *gdbarch, const char *name,
+ int *type_flags_ptr)
{
- write_register (S390_RETADDR_REGNUM, CALL_DUMMY_ADDRESS ());
- return sp;
+ if (strcmp (name, "mode32") == 0)
+ {
+ *type_flags_ptr = TYPE_FLAG_ADDRESS_CLASS_1;
+ return 1;
+ }
+ else
+ return 0;
}
-struct gdbarch *
+/* Set up gdbarch struct. */
+
+static struct gdbarch *
s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
- static LONGEST s390_call_dummy_words[] = { 0 };
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
- int elf_flags;
/* First see if there is already a gdbarch that can satisfy the request. */
arches = gdbarch_list_lookup_by_info (arches, &info);
return NULL; /* No; then it's not for us. */
/* Yes: create a new gdbarch for the specified machine type. */
- gdbarch = gdbarch_alloc (&info, NULL);
-
- /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
- ready to unwind the PC first (see frame.c:get_prev_frame()). */
- set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
+ tdep = XCALLOC (1, struct gdbarch_tdep);
+ gdbarch = gdbarch_alloc (&info, tdep);
set_gdbarch_believe_pcc_promotion (gdbarch, 0);
set_gdbarch_char_signed (gdbarch, 0);
- set_gdbarch_frame_args_skip (gdbarch, 0);
- set_gdbarch_frame_args_address (gdbarch, s390_frame_args_address);
- set_gdbarch_frame_chain (gdbarch, s390_frame_chain);
- set_gdbarch_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs);
- set_gdbarch_frame_locals_address (gdbarch, s390_frame_args_address);
- /* We can't do this */
- set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
- set_gdbarch_store_struct_return (gdbarch, s390_store_struct_return);
- set_gdbarch_deprecated_extract_return_value (gdbarch, s390_extract_return_value);
- set_gdbarch_deprecated_store_return_value (gdbarch, s390_store_return_value);
- /* Amount PC must be decremented by after a breakpoint.
- This is often the number of bytes in BREAKPOINT
- but not always. */
+ /* Amount PC must be decremented by after a breakpoint. This is
+ often the number of bytes returned by gdbarch_breakpoint_from_pc but not
+ always. */
set_gdbarch_decr_pc_after_break (gdbarch, 2);
- set_gdbarch_pop_frame (gdbarch, s390_pop_frame);
/* Stack grows downward. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- /* Offset from address of function to start of its code.
- Zero on most machines. */
- set_gdbarch_function_start_offset (gdbarch, 0);
- set_gdbarch_max_register_raw_size (gdbarch, 8);
- set_gdbarch_max_register_virtual_size (gdbarch, 8);
set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
- set_gdbarch_init_extra_frame_info (gdbarch, s390_init_extra_frame_info);
- set_gdbarch_deprecated_init_frame_pc_first (gdbarch, s390_init_frame_pc_first);
- set_gdbarch_read_fp (gdbarch, s390_read_fp);
- /* This function that tells us whether the function invocation represented
- by FI does not have a frame on the stack associated with it. If it
- does not, FRAMELESS is set to 1, else 0. */
- set_gdbarch_frameless_function_invocation (gdbarch,
- s390_frameless_function_invocation);
- /* Return saved PC from a frame */
- set_gdbarch_frame_saved_pc (gdbarch, s390_frame_saved_pc);
- /* FRAME_CHAIN takes a frame's nominal address
- and produces the frame's chain-pointer. */
- set_gdbarch_frame_chain (gdbarch, s390_frame_chain);
- set_gdbarch_saved_pc_after_call (gdbarch, s390_saved_pc_after_call);
- set_gdbarch_register_byte (gdbarch, s390_register_byte);
+ set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);
+
set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM);
set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
- set_gdbarch_fp_regnum (gdbarch, S390_FP_REGNUM);
- set_gdbarch_fp0_regnum (gdbarch, S390_FP0_REGNUM);
+ set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
- set_gdbarch_cannot_fetch_register (gdbarch, s390_cannot_fetch_register);
- set_gdbarch_cannot_store_register (gdbarch, s390_cannot_fetch_register);
- set_gdbarch_use_struct_convention (gdbarch, s390_use_struct_convention);
+ set_gdbarch_num_pseudo_regs (gdbarch, S390_NUM_PSEUDO_REGS);
set_gdbarch_register_name (gdbarch, s390_register_name);
- set_gdbarch_stab_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_deprecated_extract_struct_value_address
- (gdbarch, generic_cannot_extract_struct_value_address);
-
- /* Parameters for inferior function calls. */
- set_gdbarch_call_dummy_p (gdbarch, 1);
- set_gdbarch_call_dummy_length (gdbarch, 0);
- set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
- set_gdbarch_call_dummy_start_offset (gdbarch, 0);
- set_gdbarch_deprecated_pc_in_call_dummy (gdbarch, deprecated_pc_in_call_dummy_at_entry_point);
- set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame);
- set_gdbarch_push_arguments (gdbarch, s390_push_arguments);
- set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
- set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
- set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
- set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
- set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
- set_gdbarch_push_return_address (gdbarch, s390_push_return_address);
- set_gdbarch_sizeof_call_dummy_words (gdbarch,
- sizeof (s390_call_dummy_words));
- set_gdbarch_call_dummy_words (gdbarch, s390_call_dummy_words);
+ set_gdbarch_register_type (gdbarch, s390_register_type);
+ set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+ set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+ set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
+ set_gdbarch_register_reggroup_p (gdbarch, s390_register_reggroup_p);
+ set_gdbarch_regset_from_core_section (gdbarch,
+ s390_regset_from_core_section);
+
+ /* Inferior function calls. */
+ set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
+ set_gdbarch_unwind_dummy_id (gdbarch, s390_unwind_dummy_id);
+ set_gdbarch_frame_align (gdbarch, s390_frame_align);
+ set_gdbarch_return_value (gdbarch, s390_return_value);
+
+ /* Frame handling. */
+ dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
+ frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
+ frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
+ frame_unwind_append_sniffer (gdbarch, s390_stub_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, s390_sigtramp_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, s390_frame_sniffer);
+ frame_base_set_default (gdbarch, &s390_frame_base);
+ set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
+ set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
switch (info.bfd_arch_info->mach)
{
case bfd_mach_s390_31:
- set_gdbarch_register_size (gdbarch, 4);
- set_gdbarch_register_raw_size (gdbarch, s390_register_raw_size);
- set_gdbarch_register_virtual_size (gdbarch, s390_register_raw_size);
- set_gdbarch_register_virtual_type (gdbarch, s390_register_virtual_type);
+ tdep->abi = ABI_LINUX_S390;
+
+ tdep->gregset = &s390_gregset;
+ tdep->sizeof_gregset = s390_sizeof_gregset;
+ tdep->fpregset = &s390_fpregset;
+ tdep->sizeof_fpregset = s390_sizeof_fpregset;
set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
- set_gdbarch_register_bytes (gdbarch, S390_REGISTER_BYTES);
+ set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_ilp32_fetch_link_map_offsets);
+
break;
case bfd_mach_s390_64:
- set_gdbarch_register_size (gdbarch, 8);
- set_gdbarch_register_raw_size (gdbarch, s390x_register_raw_size);
- set_gdbarch_register_virtual_size (gdbarch, s390x_register_raw_size);
- set_gdbarch_register_virtual_type (gdbarch,
- s390x_register_virtual_type);
+ tdep->abi = ABI_LINUX_ZSERIES;
+
+ tdep->gregset = &s390x_gregset;
+ tdep->sizeof_gregset = s390x_sizeof_gregset;
+ tdep->fpregset = &s390_fpregset;
+ tdep->sizeof_fpregset = s390_sizeof_fpregset;
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
- set_gdbarch_register_bytes (gdbarch, S390X_REGISTER_BYTES);
+ set_gdbarch_pseudo_register_read (gdbarch, s390x_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, s390x_pseudo_register_write);
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
+ set_gdbarch_address_class_type_flags (gdbarch,
+ s390_address_class_type_flags);
+ set_gdbarch_address_class_type_flags_to_name (gdbarch,
+ s390_address_class_type_flags_to_name);
+ set_gdbarch_address_class_name_to_type_flags (gdbarch,
+ s390_address_class_name_to_type_flags);
break;
}
+ set_gdbarch_print_insn (gdbarch, print_insn_s390);
+
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+
return gdbarch;
}
+extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
+
void
_initialize_s390_tdep (void)
{
/* Hook us into the gdbarch mechanism. */
register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
- if (!tm_print_insn) /* Someone may have already set it */
- tm_print_insn = gdb_print_insn_s390;
}
-
-#endif /* GDBSERVER */
projects / thirdparty / binutils-gdb.git / blobdiff