/* Target-dependent code for the ALPHA architecture, for GDB, the GNU Debugger.
Copyright 1993, 94, 95, 96, 97, 1998 Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-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
-(at your option) any later version.
+ 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
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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. */
+ 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. */
#include "defs.h"
#include "frame.h"
static alpha_extra_func_info_t heuristic_proc_desc PARAMS ((CORE_ADDR,
CORE_ADDR,
- struct frame_info *));
+ struct frame_info *));
static alpha_extra_func_info_t find_proc_desc PARAMS ((CORE_ADDR,
struct frame_info *));
alpha_extra_func_info_t proc_desc));
static int alpha_in_prologue PARAMS ((CORE_ADDR pc,
- alpha_extra_func_info_t proc_desc));
+ alpha_extra_func_info_t proc_desc));
static int alpha_about_to_return PARAMS ((CORE_ADDR pc));
time across a 2400 baud serial line. Allows the user to limit this
search. */
static unsigned int heuristic_fence_post = 0;
-
+/* *INDENT-OFF* */
/* Layout of a stack frame on the alpha:
| |
-------------|-------------------------------|<-- sp
| |
*/
+/* *INDENT-ON* */
+
+
-#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
+#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
/* These next two fields are kind of being hijacked. I wonder if
iline is too small for the values it needs to hold, if GDB is
running on a 32-bit host. */
-#define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
-#define PROC_DUMMY_FRAME(proc) ((proc)->pdr.cbLineOffset) /*CALL_DUMMY frame */
+#define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
+#define PROC_DUMMY_FRAME(proc) ((proc)->pdr.cbLineOffset) /*CALL_DUMMY frame */
#define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
#define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
#define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym = _PROC_MAGIC_)
struct linked_proc_info
-{
- struct alpha_extra_func_info info;
- struct linked_proc_info *next;
-} *linked_proc_desc_table = NULL;
-
+ {
+ struct alpha_extra_func_info info;
+ struct linked_proc_info *next;
+ }
+ *linked_proc_desc_table = NULL;
\f
+
/* Under GNU/Linux, signal handler invocations can be identified by the
designated code sequence that is used to return from a signal
handler. In particular, the return address of a signal handler
points to the following sequence (the first instruction is quadword
aligned):
- bis $30,$30,$16
- addq $31,0x67,$0
- call_pal callsys
+ bis $30,$30,$16
+ addq $31,0x67,$0
+ call_pal callsys
Each instruction has a unique encoding, so we simply attempt to
match the instruction the pc is pointing to with any of the above
middle of the designated sequence, in which case there is no
guarantee that we are in the middle of a sigreturn syscall. Don't
think this will be a problem in praxis, though.
-*/
+ */
#ifndef TM_LINUXALPHA_H
/* HACK: Provide a prototype when compiling this file for non
unsigned int i[3], w;
long off;
- if (read_memory_nobpt(pc, (char *) &w, 4) != 0)
+ if (read_memory_nobpt (pc, (char *) &w, 4) != 0)
return -1;
off = -1;
switch (w)
{
- case 0x47de0410: off = 0; break; /* bis $30,$30,$16 */
- case 0x43ecf400: off = 4; break; /* addq $31,0x67,$0 */
- case 0x00000083: off = 8; break; /* call_pal callsys */
- default: return -1;
+ case 0x47de0410:
+ off = 0;
+ break; /* bis $30,$30,$16 */
+ case 0x43ecf400:
+ off = 4;
+ break; /* addq $31,0x67,$0 */
+ case 0x00000083:
+ off = 8;
+ break; /* call_pal callsys */
+ default:
+ return -1;
}
pc -= off;
if (pc & 0x7)
return -1;
}
- if (read_memory_nobpt(pc, (char *) i, sizeof(i)) != 0)
+ if (read_memory_nobpt (pc, (char *) i, sizeof (i)) != 0)
return -1;
if (i[0] == 0x47de0410 && i[1] == 0x43ecf400 && i[2] == 0x00000083)
return -1;
}
-
\f
+
/* Under OSF/1, the __sigtramp routine is frameless and has a frame
size of zero, but we are able to backtrace through it. */
CORE_ADDR
CORE_ADDR pc;
{
char *name;
- find_pc_partial_function (pc, &name, (CORE_ADDR *)NULL, (CORE_ADDR *)NULL);
+ find_pc_partial_function (pc, &name, (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
if (IN_SIGTRAMP (pc, name))
return frame->frame;
else
return 0;
}
-
\f
+
/* Dynamically create a signal-handler caller procedure descriptor for
the signal-handler return code starting at address LOW_ADDR. The
descriptor is added to the linked_proc_desc_table. */
proc_desc = &link->info;
proc_desc->numargs = 0;
- PROC_LOW_ADDR (proc_desc) = low_addr;
- PROC_HIGH_ADDR (proc_desc) = low_addr + 3 * 4;
- PROC_DUMMY_FRAME (proc_desc) = 0;
- PROC_FRAME_OFFSET (proc_desc) = 0x298; /* sizeof(struct sigcontext_struct) */
- PROC_FRAME_REG (proc_desc) = SP_REGNUM;
- PROC_REG_MASK (proc_desc) = 0xffff;
- PROC_FREG_MASK (proc_desc) = 0xffff;
- PROC_PC_REG (proc_desc) = 26;
- PROC_LOCALOFF (proc_desc) = 0;
+ PROC_LOW_ADDR (proc_desc) = low_addr;
+ PROC_HIGH_ADDR (proc_desc) = low_addr + 3 * 4;
+ PROC_DUMMY_FRAME (proc_desc) = 0;
+ PROC_FRAME_OFFSET (proc_desc) = 0x298; /* sizeof(struct sigcontext_struct) */
+ PROC_FRAME_REG (proc_desc) = SP_REGNUM;
+ PROC_REG_MASK (proc_desc) = 0xffff;
+ PROC_FREG_MASK (proc_desc) = 0xffff;
+ PROC_PC_REG (proc_desc) = 26;
+ PROC_LOCALOFF (proc_desc) = 0;
SET_PROC_DESC_IS_DYN_SIGTRAMP (proc_desc);
return (proc_desc);
}
-
\f
+
/* Guaranteed to set frame->saved_regs to some values (it never leaves it
NULL). */
sigcontext_addr = SIGCONTEXT_ADDR (frame);
for (ireg = 0; ireg < 32; ireg++)
{
- reg_position = sigcontext_addr + SIGFRAME_REGSAVE_OFF + ireg * 8;
- frame->saved_regs[ireg] = reg_position;
+ reg_position = sigcontext_addr + SIGFRAME_REGSAVE_OFF + ireg * 8;
+ frame->saved_regs[ireg] = reg_position;
}
for (ireg = 0; ireg < 32; ireg++)
{
- reg_position = sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + ireg * 8;
- frame->saved_regs[FP0_REGNUM + ireg] = reg_position;
+ reg_position = sigcontext_addr + SIGFRAME_FPREGSAVE_OFF + ireg * 8;
+ frame->saved_regs[FP0_REGNUM + ireg] = reg_position;
}
frame->saved_regs[PC_REGNUM] = sigcontext_addr + SIGFRAME_PC_OFF;
return;
{
frame->saved_regs[returnreg] = reg_position;
reg_position += 8;
- mask &= ~(1 << returnreg); /* Clear bit for RA so we
- don't save again later. */
+ mask &= ~(1 << returnreg); /* Clear bit for RA so we
+ don't save again later. */
}
- for (ireg = 0; ireg <= 31 ; ++ireg)
+ for (ireg = 0; ireg <= 31; ++ireg)
if (mask & (1 << ireg))
{
frame->saved_regs[ireg] = reg_position;
reg_position = frame->frame + PROC_FREG_OFFSET (proc_desc);
mask = PROC_FREG_MASK (proc_desc);
- for (ireg = 0; ireg <= 31 ; ++ireg)
+ for (ireg = 0; ireg <= 31; ++ireg)
if (mask & (1 << ireg))
{
- frame->saved_regs[FP0_REGNUM+ireg] = reg_position;
+ frame->saved_regs[FP0_REGNUM + ireg] = reg_position;
reg_position += 8;
}
}
static CORE_ADDR
-read_next_frame_reg(fi, regno)
+read_next_frame_reg (fi, regno)
struct frame_info *fi;
int regno;
{
for (; fi; fi = fi->next)
{
/* We have to get the saved sp from the sigcontext
- if it is a signal handler frame. */
+ if it is a signal handler frame. */
if (regno == SP_REGNUM && !fi->signal_handler_caller)
return fi->frame;
else
if (fi->saved_regs == NULL)
alpha_find_saved_regs (fi);
if (fi->saved_regs[regno])
- return read_memory_integer(fi->saved_regs[regno], 8);
+ return read_memory_integer (fi->saved_regs[regno], 8);
}
}
- return read_register(regno);
+ return read_register (regno);
}
CORE_ADDR
-alpha_frame_saved_pc(frame)
+alpha_frame_saved_pc (frame)
struct frame_info *frame;
{
alpha_extra_func_info_t proc_desc = frame->proc_desc;
if it is a signal handler frame. */
int pcreg = frame->signal_handler_caller ? PC_REGNUM : frame->pc_reg;
- if (proc_desc && PROC_DESC_IS_DUMMY(proc_desc))
- return read_memory_integer(frame->frame - 8, 8);
+ if (proc_desc && PROC_DESC_IS_DUMMY (proc_desc))
+ return read_memory_integer (frame->frame - 8, 8);
- return read_next_frame_reg(frame, pcreg);
+ return read_next_frame_reg (frame, pcreg);
}
CORE_ADDR
lines. */
static CORE_ADDR
-heuristic_proc_start(pc)
- CORE_ADDR pc;
+heuristic_proc_start (pc)
+ CORE_ADDR pc;
{
- CORE_ADDR start_pc = pc;
- CORE_ADDR fence = start_pc - heuristic_fence_post;
+ CORE_ADDR start_pc = pc;
+ CORE_ADDR fence = start_pc - heuristic_fence_post;
- if (start_pc == 0) return 0;
+ if (start_pc == 0)
+ return 0;
- if (heuristic_fence_post == UINT_MAX
- || fence < VM_MIN_ADDRESS)
- fence = VM_MIN_ADDRESS;
+ if (heuristic_fence_post == UINT_MAX
+ || fence < VM_MIN_ADDRESS)
+ fence = VM_MIN_ADDRESS;
- /* search back for previous return */
- for (start_pc -= 4; ; start_pc -= 4)
- if (start_pc < fence)
+ /* search back for previous return */
+ for (start_pc -= 4;; start_pc -= 4)
+ if (start_pc < fence)
+ {
+ /* It's not clear to me why we reach this point when
+ stop_soon_quietly, but with this test, at least we
+ don't print out warnings for every child forked (eg, on
+ decstation). 22apr93 rich@cygnus.com. */
+ if (!stop_soon_quietly)
{
- /* It's not clear to me why we reach this point when
- stop_soon_quietly, but with this test, at least we
- don't print out warnings for every child forked (eg, on
- decstation). 22apr93 rich@cygnus.com. */
- if (!stop_soon_quietly)
+ static int blurb_printed = 0;
+
+ if (fence == VM_MIN_ADDRESS)
+ warning ("Hit beginning of text section without finding");
+ else
+ warning ("Hit heuristic-fence-post without finding");
+
+ warning ("enclosing function for address 0x%lx", pc);
+ if (!blurb_printed)
{
- static int blurb_printed = 0;
-
- if (fence == VM_MIN_ADDRESS)
- warning("Hit beginning of text section without finding");
- else
- warning("Hit heuristic-fence-post without finding");
-
- warning("enclosing function for address 0x%lx", pc);
- if (!blurb_printed)
- {
- printf_filtered ("\
+ printf_filtered ("\
This warning occurs if you are debugging a function without any symbols\n\
(for example, in a stripped executable). In that case, you may wish to\n\
increase the size of the search with the `set heuristic-fence-post' command.\n\
\n\
Otherwise, you told GDB there was a function where there isn't one, or\n\
(more likely) you have encountered a bug in GDB.\n");
- blurb_printed = 1;
- }
+ blurb_printed = 1;
}
-
- return 0;
}
- else if (alpha_about_to_return (start_pc))
- break;
- start_pc += 4; /* skip return */
- return start_pc;
+ return 0;
+ }
+ else if (alpha_about_to_return (start_pc))
+ break;
+
+ start_pc += 4; /* skip return */
+ return start_pc;
}
static alpha_extra_func_info_t
-heuristic_proc_desc(start_pc, limit_pc, next_frame)
- CORE_ADDR start_pc, limit_pc;
- struct frame_info *next_frame;
+heuristic_proc_desc (start_pc, limit_pc, next_frame)
+ CORE_ADDR start_pc, limit_pc;
+ struct frame_info *next_frame;
{
- CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
- CORE_ADDR cur_pc;
- int frame_size;
- int has_frame_reg = 0;
- unsigned long reg_mask = 0;
- int pcreg = -1;
-
- if (start_pc == 0)
- return NULL;
- memset (&temp_proc_desc, '\0', sizeof(temp_proc_desc));
- memset (&temp_saved_regs, '\0', sizeof(struct frame_saved_regs));
- PROC_LOW_ADDR (&temp_proc_desc) = start_pc;
-
- if (start_pc + 200 < limit_pc)
- limit_pc = start_pc + 200;
- frame_size = 0;
- for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
- {
- char buf[4];
- unsigned long word;
- int status;
+ CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
+ CORE_ADDR cur_pc;
+ int frame_size;
+ int has_frame_reg = 0;
+ unsigned long reg_mask = 0;
+ int pcreg = -1;
+
+ if (start_pc == 0)
+ return NULL;
+ memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc));
+ memset (&temp_saved_regs, '\0', sizeof (struct frame_saved_regs));
+ PROC_LOW_ADDR (&temp_proc_desc) = start_pc;
+
+ if (start_pc + 200 < limit_pc)
+ limit_pc = start_pc + 200;
+ frame_size = 0;
+ for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
+ {
+ char buf[4];
+ unsigned long word;
+ int status;
- status = read_memory_nobpt (cur_pc, buf, 4);
- if (status)
- memory_error (status, cur_pc);
- word = extract_unsigned_integer (buf, 4);
+ status = read_memory_nobpt (cur_pc, buf, 4);
+ if (status)
+ memory_error (status, cur_pc);
+ word = extract_unsigned_integer (buf, 4);
- if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
- {
- if (word & 0x8000)
- frame_size += (-word) & 0xffff;
- else
- /* Exit loop if a positive stack adjustment is found, which
- usually means that the stack cleanup code in the function
- epilogue is reached. */
- break;
- }
- else if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
- && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
- {
- int reg = (word & 0x03e00000) >> 21;
- reg_mask |= 1 << reg;
- temp_saved_regs.regs[reg] = sp + (short)word;
-
- /* Starting with OSF/1-3.2C, the system libraries are shipped
- without local symbols, but they still contain procedure
- descriptors without a symbol reference. GDB is currently
- unable to find these procedure descriptors and uses
- heuristic_proc_desc instead.
- As some low level compiler support routines (__div*, __add*)
- use a non-standard return address register, we have to
- add some heuristics to determine the return address register,
- or stepping over these routines will fail.
- Usually the return address register is the first register
- saved on the stack, but assembler optimization might
- rearrange the register saves.
- So we recognize only a few registers (t7, t9, ra) within
- the procedure prologue as valid return address registers.
- If we encounter a return instruction, we extract the
- the return address register from it.
-
- FIXME: Rewriting GDB to access the procedure descriptors,
- e.g. via the minimal symbol table, might obviate this hack. */
- if (pcreg == -1
- && cur_pc < (start_pc + 80)
- && (reg == T7_REGNUM || reg == T9_REGNUM || reg == RA_REGNUM))
- pcreg = reg;
- }
- else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
- pcreg = (word >> 16) & 0x1f;
- else if (word == 0x47de040f) /* bis sp,sp fp */
- has_frame_reg = 1;
- }
- if (pcreg == -1)
- {
- /* If we haven't found a valid return address register yet,
- keep searching in the procedure prologue. */
- while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
- {
- char buf[4];
- unsigned long word;
+ if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
+ {
+ if (word & 0x8000)
+ frame_size += (-word) & 0xffff;
+ else
+ /* Exit loop if a positive stack adjustment is found, which
+ usually means that the stack cleanup code in the function
+ epilogue is reached. */
+ break;
+ }
+ else if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
+ && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
+ {
+ int reg = (word & 0x03e00000) >> 21;
+ reg_mask |= 1 << reg;
+ temp_saved_regs.regs[reg] = sp + (short) word;
+
+ /* Starting with OSF/1-3.2C, the system libraries are shipped
+ without local symbols, but they still contain procedure
+ descriptors without a symbol reference. GDB is currently
+ unable to find these procedure descriptors and uses
+ heuristic_proc_desc instead.
+ As some low level compiler support routines (__div*, __add*)
+ use a non-standard return address register, we have to
+ add some heuristics to determine the return address register,
+ or stepping over these routines will fail.
+ Usually the return address register is the first register
+ saved on the stack, but assembler optimization might
+ rearrange the register saves.
+ So we recognize only a few registers (t7, t9, ra) within
+ the procedure prologue as valid return address registers.
+ If we encounter a return instruction, we extract the
+ the return address register from it.
+
+ FIXME: Rewriting GDB to access the procedure descriptors,
+ e.g. via the minimal symbol table, might obviate this hack. */
+ if (pcreg == -1
+ && cur_pc < (start_pc + 80)
+ && (reg == T7_REGNUM || reg == T9_REGNUM || reg == RA_REGNUM))
+ pcreg = reg;
+ }
+ else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
+ pcreg = (word >> 16) & 0x1f;
+ else if (word == 0x47de040f) /* bis sp,sp fp */
+ has_frame_reg = 1;
+ }
+ if (pcreg == -1)
+ {
+ /* If we haven't found a valid return address register yet,
+ keep searching in the procedure prologue. */
+ while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
+ {
+ char buf[4];
+ unsigned long word;
- if (read_memory_nobpt (cur_pc, buf, 4))
- break;
- cur_pc += 4;
- word = extract_unsigned_integer (buf, 4);
+ if (read_memory_nobpt (cur_pc, buf, 4))
+ break;
+ cur_pc += 4;
+ word = extract_unsigned_integer (buf, 4);
- if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
- && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
- {
- int reg = (word & 0x03e00000) >> 21;
- if (reg == T7_REGNUM || reg == T9_REGNUM || reg == RA_REGNUM)
- {
- pcreg = reg;
- break;
- }
- }
- else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
- {
- pcreg = (word >> 16) & 0x1f;
- break;
- }
- }
- }
+ if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
+ && (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
+ {
+ int reg = (word & 0x03e00000) >> 21;
+ if (reg == T7_REGNUM || reg == T9_REGNUM || reg == RA_REGNUM)
+ {
+ pcreg = reg;
+ break;
+ }
+ }
+ else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
+ {
+ pcreg = (word >> 16) & 0x1f;
+ break;
+ }
+ }
+ }
- if (has_frame_reg)
- PROC_FRAME_REG(&temp_proc_desc) = GCC_FP_REGNUM;
- else
- PROC_FRAME_REG(&temp_proc_desc) = SP_REGNUM;
- PROC_FRAME_OFFSET(&temp_proc_desc) = frame_size;
- PROC_REG_MASK(&temp_proc_desc) = reg_mask;
- PROC_PC_REG(&temp_proc_desc) = (pcreg == -1) ? RA_REGNUM : pcreg;
- PROC_LOCALOFF(&temp_proc_desc) = 0; /* XXX - bogus */
- return &temp_proc_desc;
+ if (has_frame_reg)
+ PROC_FRAME_REG (&temp_proc_desc) = GCC_FP_REGNUM;
+ else
+ PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM;
+ PROC_FRAME_OFFSET (&temp_proc_desc) = frame_size;
+ PROC_REG_MASK (&temp_proc_desc) = reg_mask;
+ PROC_PC_REG (&temp_proc_desc) = (pcreg == -1) ? RA_REGNUM : pcreg;
+ PROC_LOCALOFF (&temp_proc_desc) = 0; /* XXX - bogus */
+ return &temp_proc_desc;
}
/* This returns the PC of the first inst after the prologue. If we can't
return PROC_LOW_ADDR (proc_desc); /* "prologue" is in kernel */
/* If function is frameless, then we need to do it the hard way. I
- strongly suspect that frameless always means prologueless... */
+ strongly suspect that frameless always means prologueless... */
if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
&& PROC_FRAME_OFFSET (proc_desc) == 0)
return 0;
static alpha_extra_func_info_t
find_proc_desc (pc, next_frame)
- CORE_ADDR pc;
- struct frame_info *next_frame;
+ CORE_ADDR pc;
+ struct frame_info *next_frame;
{
alpha_extra_func_info_t proc_desc;
struct block *b;
return found_proc_desc;
}
- b = block_for_pc(pc);
+ b = block_for_pc (pc);
find_pc_partial_function (pc, NULL, &startaddr, NULL);
if (b == NULL)
if (sym)
{
- /* IF this is the topmost frame AND
- * (this proc does not have debugging information OR
- * the PC is in the procedure prologue)
- * THEN create a "heuristic" proc_desc (by analyzing
- * the actual code) to replace the "official" proc_desc.
- */
- proc_desc = (alpha_extra_func_info_t)SYMBOL_VALUE(sym);
- if (next_frame == NULL)
- {
- if (PROC_DESC_IS_DUMMY (proc_desc) || alpha_in_prologue (pc, proc_desc))
- {
- alpha_extra_func_info_t found_heuristic =
- heuristic_proc_desc (PROC_LOW_ADDR (proc_desc),
- pc, next_frame);
- if (found_heuristic)
- {
- PROC_LOCALOFF (found_heuristic) =
- PROC_LOCALOFF (proc_desc);
- PROC_PC_REG (found_heuristic) = PROC_PC_REG (proc_desc);
- proc_desc = found_heuristic;
- }
- }
- }
+ /* IF this is the topmost frame AND
+ * (this proc does not have debugging information OR
+ * the PC is in the procedure prologue)
+ * THEN create a "heuristic" proc_desc (by analyzing
+ * the actual code) to replace the "official" proc_desc.
+ */
+ proc_desc = (alpha_extra_func_info_t) SYMBOL_VALUE (sym);
+ if (next_frame == NULL)
+ {
+ if (PROC_DESC_IS_DUMMY (proc_desc) || alpha_in_prologue (pc, proc_desc))
+ {
+ alpha_extra_func_info_t found_heuristic =
+ heuristic_proc_desc (PROC_LOW_ADDR (proc_desc),
+ pc, next_frame);
+ if (found_heuristic)
+ {
+ PROC_LOCALOFF (found_heuristic) =
+ PROC_LOCALOFF (proc_desc);
+ PROC_PC_REG (found_heuristic) = PROC_PC_REG (proc_desc);
+ proc_desc = found_heuristic;
+ }
+ }
+ }
}
else
{
long offset;
/* Is linked_proc_desc_table really necessary? It only seems to be used
- by procedure call dummys. However, the procedures being called ought
- to have their own proc_descs, and even if they don't,
- heuristic_proc_desc knows how to create them! */
+ by procedure call dummys. However, the procedures being called ought
+ to have their own proc_descs, and even if they don't,
+ heuristic_proc_desc knows how to create them! */
register struct linked_proc_info *link;
for (link = linked_proc_desc_table; link; link = link->next)
- if (PROC_LOW_ADDR(&link->info) <= pc
- && PROC_HIGH_ADDR(&link->info) > pc)
- return &link->info;
+ if (PROC_LOW_ADDR (&link->info) <= pc
+ && PROC_HIGH_ADDR (&link->info) > pc)
+ return &link->info;
/* If PC is inside a dynamically generated sigtramp handler,
- create and push a procedure descriptor for that code: */
+ create and push a procedure descriptor for that code: */
offset = DYNAMIC_SIGTRAMP_OFFSET (pc);
if (offset >= 0)
return push_sigtramp_desc (pc - offset);
/* If heuristic_fence_post is non-zero, determine the procedure
- start address by examining the instructions.
- This allows us to find the start address of static functions which
- have no symbolic information, as startaddr would have been set to
- the preceding global function start address by the
- find_pc_partial_function call above. */
+ start address by examining the instructions.
+ This allows us to find the start address of static functions which
+ have no symbolic information, as startaddr would have been set to
+ the preceding global function start address by the
+ find_pc_partial_function call above. */
if (startaddr == 0 || heuristic_fence_post != 0)
startaddr = heuristic_proc_start (pc);
alpha_extra_func_info_t cached_proc_desc;
CORE_ADDR
-alpha_frame_chain(frame)
- struct frame_info *frame;
+alpha_frame_chain (frame)
+ struct frame_info *frame;
{
- alpha_extra_func_info_t proc_desc;
- CORE_ADDR saved_pc = FRAME_SAVED_PC(frame);
-
- if (saved_pc == 0 || inside_entry_file (saved_pc))
- return 0;
-
- proc_desc = find_proc_desc(saved_pc, frame);
- if (!proc_desc)
- return 0;
-
- cached_proc_desc = proc_desc;
-
- /* Fetch the frame pointer for a dummy frame from the procedure
- descriptor. */
- if (PROC_DESC_IS_DUMMY(proc_desc))
- return (CORE_ADDR) PROC_DUMMY_FRAME(proc_desc);
-
- /* If no frame pointer and frame size is zero, we must be at end
- of stack (or otherwise hosed). If we don't check frame size,
- we loop forever if we see a zero size frame. */
- if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
- && PROC_FRAME_OFFSET (proc_desc) == 0
- /* The previous frame from a sigtramp frame might be frameless
- and have frame size zero. */
- && !frame->signal_handler_caller)
- return FRAME_PAST_SIGTRAMP_FRAME (frame, saved_pc);
- else
- return read_next_frame_reg(frame, PROC_FRAME_REG(proc_desc))
- + PROC_FRAME_OFFSET(proc_desc);
+ alpha_extra_func_info_t proc_desc;
+ CORE_ADDR saved_pc = FRAME_SAVED_PC (frame);
+
+ if (saved_pc == 0 || inside_entry_file (saved_pc))
+ return 0;
+
+ proc_desc = find_proc_desc (saved_pc, frame);
+ if (!proc_desc)
+ return 0;
+
+ cached_proc_desc = proc_desc;
+
+ /* Fetch the frame pointer for a dummy frame from the procedure
+ descriptor. */
+ if (PROC_DESC_IS_DUMMY (proc_desc))
+ return (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc);
+
+ /* If no frame pointer and frame size is zero, we must be at end
+ of stack (or otherwise hosed). If we don't check frame size,
+ we loop forever if we see a zero size frame. */
+ if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
+ && PROC_FRAME_OFFSET (proc_desc) == 0
+ /* The previous frame from a sigtramp frame might be frameless
+ and have frame size zero. */
+ && !frame->signal_handler_caller)
+ return FRAME_PAST_SIGTRAMP_FRAME (frame, saved_pc);
+ else
+ return read_next_frame_reg (frame, PROC_FRAME_REG (proc_desc))
+ + PROC_FRAME_OFFSET (proc_desc);
}
void
{
/* Use proc_desc calculated in frame_chain */
alpha_extra_func_info_t proc_desc =
- frame->next ? cached_proc_desc : find_proc_desc(frame->pc, frame->next);
+ frame->next ? cached_proc_desc : find_proc_desc (frame->pc, frame->next);
frame->saved_regs = NULL;
frame->localoff = 0;
if (proc_desc)
{
/* Get the locals offset and the saved pc register from the
- procedure descriptor, they are valid even if we are in the
- middle of the prologue. */
- frame->localoff = PROC_LOCALOFF(proc_desc);
- frame->pc_reg = PROC_PC_REG(proc_desc);
+ procedure descriptor, they are valid even if we are in the
+ middle of the prologue. */
+ frame->localoff = PROC_LOCALOFF (proc_desc);
+ frame->pc_reg = PROC_PC_REG (proc_desc);
/* Fixup frame-pointer - only needed for top frame */
/* Fetch the frame pointer for a dummy frame from the procedure
- descriptor. */
- if (PROC_DESC_IS_DUMMY(proc_desc))
- frame->frame = (CORE_ADDR) PROC_DUMMY_FRAME(proc_desc);
+ descriptor. */
+ if (PROC_DESC_IS_DUMMY (proc_desc))
+ frame->frame = (CORE_ADDR) PROC_DUMMY_FRAME (proc_desc);
/* This may not be quite right, if proc has a real frame register.
- Get the value of the frame relative sp, procedure might have been
- interrupted by a signal at it's very start. */
+ Get the value of the frame relative sp, procedure might have been
+ interrupted by a signal at it's very start. */
else if (frame->pc == PROC_LOW_ADDR (proc_desc)
&& !PROC_DESC_IS_DYN_SIGTRAMP (proc_desc))
frame->frame = read_next_frame_reg (frame->next, SP_REGNUM);
alpha_find_saved_registers will do that for us.
We can't use frame->signal_handler_caller, it is not yet set. */
find_pc_partial_function (frame->pc, &name,
- (CORE_ADDR *)NULL,(CORE_ADDR *)NULL);
+ (CORE_ADDR *) NULL, (CORE_ADDR *) NULL);
if (!IN_SIGTRAMP (frame->pc, name))
{
- frame->saved_regs = (CORE_ADDR*)
+ frame->saved_regs = (CORE_ADDR *)
frame_obstack_alloc (SIZEOF_FRAME_SAVED_REGS);
memcpy (frame->saved_regs, temp_saved_regs.regs, SIZEOF_FRAME_SAVED_REGS);
frame->saved_regs[PC_REGNUM]
int i;
int accumulate_size = struct_return ? 8 : 0;
int arg_regs_size = ALPHA_NUM_ARG_REGS * 8;
- struct alpha_arg { char *contents; int len; int offset; };
+ struct alpha_arg
+ {
+ char *contents;
+ int len;
+ int offset;
+ };
struct alpha_arg *alpha_args =
- (struct alpha_arg*)alloca (nargs * sizeof (struct alpha_arg));
+ (struct alpha_arg *) alloca (nargs * sizeof (struct alpha_arg));
register struct alpha_arg *m_arg;
char raw_buffer[sizeof (CORE_ADDR)];
int required_arg_regs;
m_arg->len = TYPE_LENGTH (arg_type);
m_arg->offset = accumulate_size;
accumulate_size = (accumulate_size + m_arg->len + 7) & ~7;
- m_arg->contents = VALUE_CONTENTS(arg);
+ m_arg->contents = VALUE_CONTENTS (arg);
}
/* Determine required argument register loads, loading an argument register
/* Make room for the arguments on the stack. */
if (accumulate_size < arg_regs_size)
- accumulate_size = arg_regs_size;
+ accumulate_size = arg_regs_size;
sp -= accumulate_size;
/* Keep sp aligned to a multiple of 16 as the compiler does it too. */
sp &= ~15;
/* `Push' arguments on the stack. */
- for (i = nargs; m_arg--, --i >= 0; )
- write_memory(sp + m_arg->offset, m_arg->contents, m_arg->len);
+ for (i = nargs; m_arg--, --i >= 0;)
+ write_memory (sp + m_arg->offset, m_arg->contents, m_arg->len);
if (struct_return)
{
store_address (raw_buffer, sizeof (CORE_ADDR), struct_addr);
}
void
-alpha_push_dummy_frame()
+alpha_push_dummy_frame ()
{
int ireg;
struct linked_proc_info *link;
char raw_buffer[MAX_REGISTER_RAW_SIZE];
unsigned long mask;
- link = (struct linked_proc_info *) xmalloc(sizeof (struct linked_proc_info));
+ link = (struct linked_proc_info *) xmalloc (sizeof (struct linked_proc_info));
link->next = linked_proc_desc_table;
linked_proc_desc_table = link;
-
+
proc_desc = &link->info;
/*
*
* Dummy frame layout:
* (high memory)
- * Saved PC
+ * Saved PC
* Saved F30
* ...
* Saved F0
- * Saved R29
- * ...
- * Saved R0
- * Saved R26 (RA)
- * Parameter build area
+ * Saved R29
+ * ...
+ * Saved R0
+ * Saved R26 (RA)
+ * Parameter build area
* (low memory)
*/
alpha_frame_saved_pc knows where the pc is saved in a dummy frame. */
#define SPECIAL_REG_SAVE_COUNT 1
- PROC_REG_MASK(proc_desc) = GEN_REG_SAVE_MASK;
- PROC_FREG_MASK(proc_desc) = FLOAT_REG_SAVE_MASK;
+ PROC_REG_MASK (proc_desc) = GEN_REG_SAVE_MASK;
+ PROC_FREG_MASK (proc_desc) = FLOAT_REG_SAVE_MASK;
/* PROC_REG_OFFSET is the offset from the dummy frame to the saved RA,
but keep SP aligned to a multiple of 16. */
- PROC_REG_OFFSET(proc_desc) =
- - ((8 * (SPECIAL_REG_SAVE_COUNT
+ PROC_REG_OFFSET (proc_desc) =
+ -((8 * (SPECIAL_REG_SAVE_COUNT
+ GEN_REG_SAVE_COUNT
+ FLOAT_REG_SAVE_COUNT)
- + 15) & ~15);
- PROC_FREG_OFFSET(proc_desc) =
- PROC_REG_OFFSET(proc_desc) + 8 * GEN_REG_SAVE_COUNT;
+ + 15) & ~15);
+ PROC_FREG_OFFSET (proc_desc) =
+ PROC_REG_OFFSET (proc_desc) + 8 * GEN_REG_SAVE_COUNT;
/* Save general registers.
The return address register is the first saved register, all other
registers follow in ascending order.
The PC is saved immediately below the SP. */
- save_address = sp + PROC_REG_OFFSET(proc_desc);
+ save_address = sp + PROC_REG_OFFSET (proc_desc);
store_address (raw_buffer, 8, read_register (RA_REGNUM));
write_memory (save_address, raw_buffer, 8);
save_address += 8;
- mask = PROC_REG_MASK(proc_desc) & 0xffffffffL;
+ mask = PROC_REG_MASK (proc_desc) & 0xffffffffL;
for (ireg = 0; mask; ireg++, mask >>= 1)
if (mask & 1)
{
write_memory (sp - 8, raw_buffer, 8);
/* Save floating point registers. */
- save_address = sp + PROC_FREG_OFFSET(proc_desc);
- mask = PROC_FREG_MASK(proc_desc) & 0xffffffffL;
+ save_address = sp + PROC_FREG_OFFSET (proc_desc);
+ mask = PROC_FREG_MASK (proc_desc) & 0xffffffffL;
for (ireg = 0; mask; ireg++, mask >>= 1)
if (mask & 1)
{
is set to the virtual frame (pseudo) register, it's value will always
be read as zero and will help us to catch any errors in the dummy frame
retrieval code. */
- PROC_DUMMY_FRAME(proc_desc) = sp;
- PROC_FRAME_REG(proc_desc) = FP_REGNUM;
- PROC_FRAME_OFFSET(proc_desc) = 0;
- sp += PROC_REG_OFFSET(proc_desc);
+ PROC_DUMMY_FRAME (proc_desc) = sp;
+ PROC_FRAME_REG (proc_desc) = FP_REGNUM;
+ PROC_FRAME_OFFSET (proc_desc) = 0;
+ sp += PROC_REG_OFFSET (proc_desc);
write_register (SP_REGNUM, sp);
- PROC_LOW_ADDR(proc_desc) = CALL_DUMMY_ADDRESS ();
- PROC_HIGH_ADDR(proc_desc) = PROC_LOW_ADDR(proc_desc) + 4;
+ PROC_LOW_ADDR (proc_desc) = CALL_DUMMY_ADDRESS ();
+ PROC_HIGH_ADDR (proc_desc) = PROC_LOW_ADDR (proc_desc) + 4;
- SET_PROC_DESC_IS_DUMMY(proc_desc);
- PROC_PC_REG(proc_desc) = RA_REGNUM;
+ SET_PROC_DESC_IS_DUMMY (proc_desc);
+ PROC_PC_REG (proc_desc) = RA_REGNUM;
}
void
-alpha_pop_frame()
+alpha_pop_frame ()
{
register int regnum;
struct frame_info *frame = get_current_frame ();
/* we need proc_desc to know how to restore the registers;
if it is NULL, construct (a temporary) one */
if (proc_desc == NULL)
- proc_desc = find_proc_desc(frame->pc, frame->next);
+ proc_desc = find_proc_desc (frame->pc, frame->next);
/* Question: should we copy this proc_desc and save it in
frame->proc_desc? If we do, who will free it?
For now, we don't save a copy... */
- write_register (PC_REGNUM, FRAME_SAVED_PC(frame));
+ write_register (PC_REGNUM, FRAME_SAVED_PC (frame));
if (frame->saved_regs == NULL)
alpha_find_saved_regs (frame);
if (proc_desc)
{
- for (regnum = 32; --regnum >= 0; )
- if (PROC_REG_MASK(proc_desc) & (1 << regnum))
+ for (regnum = 32; --regnum >= 0;)
+ if (PROC_REG_MASK (proc_desc) & (1 << regnum))
write_register (regnum,
read_memory_integer (frame->saved_regs[regnum],
8));
- for (regnum = 32; --regnum >= 0; )
- if (PROC_FREG_MASK(proc_desc) & (1 << regnum))
+ for (regnum = 32; --regnum >= 0;)
+ if (PROC_FREG_MASK (proc_desc) & (1 << regnum))
write_register (regnum + FP0_REGNUM,
- read_memory_integer (frame->saved_regs[regnum + FP0_REGNUM], 8));
+ read_memory_integer (frame->saved_regs[regnum + FP0_REGNUM], 8));
}
write_register (SP_REGNUM, new_sp);
flush_cached_frames ();
- if (proc_desc && (PROC_DESC_IS_DUMMY(proc_desc)
+ if (proc_desc && (PROC_DESC_IS_DUMMY (proc_desc)
|| PROC_DESC_IS_DYN_SIGTRAMP (proc_desc)))
{
struct linked_proc_info *pi_ptr, *prev_ptr;
CORE_ADDR pc;
int lenient;
{
- unsigned long inst;
- int offset;
- CORE_ADDR post_prologue_pc;
- char buf[4];
+ unsigned long inst;
+ int offset;
+ CORE_ADDR post_prologue_pc;
+ char buf[4];
#ifdef GDB_TARGET_HAS_SHARED_LIBS
- /* Silently return the unaltered pc upon memory errors.
- This could happen on OSF/1 if decode_line_1 tries to skip the
- prologue for quickstarted shared library functions when the
- shared library is not yet mapped in.
- Reading target memory is slow over serial lines, so we perform
- this check only if the target has shared libraries. */
- if (target_read_memory (pc, buf, 4))
- return pc;
+ /* Silently return the unaltered pc upon memory errors.
+ This could happen on OSF/1 if decode_line_1 tries to skip the
+ prologue for quickstarted shared library functions when the
+ shared library is not yet mapped in.
+ Reading target memory is slow over serial lines, so we perform
+ this check only if the target has shared libraries. */
+ if (target_read_memory (pc, buf, 4))
+ return pc;
#endif
- /* See if we can determine the end of the prologue via the symbol table.
- If so, then return either PC, or the PC after the prologue, whichever
- is greater. */
-
- post_prologue_pc = after_prologue (pc, NULL);
+ /* See if we can determine the end of the prologue via the symbol table.
+ If so, then return either PC, or the PC after the prologue, whichever
+ is greater. */
- if (post_prologue_pc != 0)
- return max (pc, post_prologue_pc);
+ post_prologue_pc = after_prologue (pc, NULL);
- /* Can't determine prologue from the symbol table, need to examine
- instructions. */
+ if (post_prologue_pc != 0)
+ return max (pc, post_prologue_pc);
- /* Skip the typical prologue instructions. These are the stack adjustment
- instruction and the instructions that save registers on the stack
- or in the gcc frame. */
- for (offset = 0; offset < 100; offset += 4)
- {
- int status;
+ /* Can't determine prologue from the symbol table, need to examine
+ instructions. */
- status = read_memory_nobpt (pc + offset, buf, 4);
- if (status)
- memory_error (status, pc + offset);
- inst = extract_unsigned_integer (buf, 4);
-
- /* The alpha has no delay slots. But let's keep the lenient stuff,
- we might need it for something else in the future. */
- if (lenient && 0)
- continue;
-
- if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */
- continue;
- if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */
- continue;
- if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
- continue;
- if ((inst & 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */
- continue;
-
- if ((inst & 0xfc1f0000) == 0xb41e0000
- && (inst & 0xffff0000) != 0xb7fe0000)
- continue; /* stq reg,n($sp) */
- /* reg != $zero */
- if ((inst & 0xfc1f0000) == 0x9c1e0000
- && (inst & 0xffff0000) != 0x9ffe0000)
- continue; /* stt reg,n($sp) */
- /* reg != $zero */
- if (inst == 0x47de040f) /* bis sp,sp,fp */
- continue;
-
- break;
+ /* Skip the typical prologue instructions. These are the stack adjustment
+ instruction and the instructions that save registers on the stack
+ or in the gcc frame. */
+ for (offset = 0; offset < 100; offset += 4)
+ {
+ int status;
+
+ status = read_memory_nobpt (pc + offset, buf, 4);
+ if (status)
+ memory_error (status, pc + offset);
+ inst = extract_unsigned_integer (buf, 4);
+
+ /* The alpha has no delay slots. But let's keep the lenient stuff,
+ we might need it for something else in the future. */
+ if (lenient && 0)
+ continue;
+
+ if ((inst & 0xffff0000) == 0x27bb0000) /* ldah $gp,n($t12) */
+ continue;
+ if ((inst & 0xffff0000) == 0x23bd0000) /* lda $gp,n($gp) */
+ continue;
+ if ((inst & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
+ continue;
+ if ((inst & 0xffe01fff) == 0x43c0153e) /* subq $sp,n,$sp */
+ continue;
+
+ if ((inst & 0xfc1f0000) == 0xb41e0000
+ && (inst & 0xffff0000) != 0xb7fe0000)
+ continue; /* stq reg,n($sp) */
+ /* reg != $zero */
+ if ((inst & 0xfc1f0000) == 0x9c1e0000
+ && (inst & 0xffff0000) != 0x9ffe0000)
+ continue; /* stt reg,n($sp) */
+ /* reg != $zero */
+ if (inst == 0x47de040f) /* bis sp,sp,fp */
+ continue;
+
+ break;
}
- return pc + offset;
+ return pc + offset;
}
#if 0
/* The alpha needs a conversion between register and memory format if
the register is a floating point register and
- memory format is float, as the register format must be double
+ memory format is float, as the register format must be double
or
- memory format is an integer with 4 bytes or less, as the representation
- of integers in floating point registers is different. */
+ memory format is an integer with 4 bytes or less, as the representation
+ of integers in floating point registers is different. */
void
alpha_register_convert_to_virtual (regnum, valtype, raw_buffer, virtual_buffer)
- int regnum;
- struct type *valtype;
- char *raw_buffer;
- char *virtual_buffer;
+ int regnum;
+ struct type *valtype;
+ char *raw_buffer;
+ char *virtual_buffer;
{
if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum))
{
void
alpha_register_convert_to_raw (valtype, regnum, virtual_buffer, raw_buffer)
- struct type *valtype;
- int regnum;
- char *virtual_buffer;
- char *raw_buffer;
+ struct type *valtype;
+ int regnum;
+ char *virtual_buffer;
+ char *raw_buffer;
{
if (TYPE_LENGTH (valtype) >= REGISTER_RAW_SIZE (regnum))
{
void
alpha_extract_return_value (valtype, regbuf, valbuf)
- struct type *valtype;
- char regbuf[REGISTER_BYTES];
- char *valbuf;
+ struct type *valtype;
+ char regbuf[REGISTER_BYTES];
+ char *valbuf;
{
if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
alpha_register_convert_to_virtual (FP0_REGNUM, valtype,
void
alpha_store_return_value (valtype, valbuf)
- struct type *valtype;
- char *valbuf;
+ struct type *valtype;
+ char *valbuf;
{
char raw_buffer[MAX_REGISTER_RAW_SIZE];
int regnum = V0_REGNUM;
int length = TYPE_LENGTH (valtype);
-
+
if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
{
regnum = FP0_REGNUM;
projects / thirdparty / binutils-gdb.git / blobdiff