--- /dev/null
+/* Target-dependent code for the GNU Hurd.
+ Copyright (C) 2024 Free Software Foundation, Inc.
+
+ 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 3 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.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "extract-store-integer.h"
+#include "gdbcore.h"
+#include "osabi.h"
+#include "solib-svr4.h"
+
+#include "amd64-tdep.h"
+#include "glibc-tdep.h"
+
+/* Recognizing signal handler frames. */
+
+/* When the GNU/Hurd libc calls a signal handler, the return address points
+ inside the trampoline assembly snippet.
+
+ If the trampoline function name can not be identified, we resort to reading
+ memory from the process in order to identify it. */
+
+static const gdb_byte gnu_sigtramp_code[] =
+{
+/* rpc_wait_trampoline: */
+ 0x48, 0xc7, 0xc0, 0xe7, 0xff, 0xff, 0xff, /* mov $-25,%rax */
+ 0x0f, 0x05, /* syscall */
+ 0x49, 0x89, 0x04, 0x24, /* mov %rax,(%r12) */
+ 0x48, 0x89, 0xdc, /* mov %rbx,%rsp */
+
+/* trampoline: */
+ 0x5f, /* pop %rdi */
+ 0x5e, /* pop %rsi */
+ 0x5a, /* pop %rdx */
+ 0x48, 0x83, 0xc4, 0x08, /* add $0x8,%rsp */
+ 0x41, 0xff, 0xd5, /* call *%r13 */
+
+/* RA HERE */
+ 0x48, 0x8b, 0x7c, 0x24, 0x10, /* mov 0x10(%rsp),%rdi */
+ 0xc3, /* ret */
+
+/* firewall: */
+ 0xf4, /* hlt */
+};
+
+#define GNU_SIGTRAMP_LEN (sizeof gnu_sigtramp_code)
+#define GNU_SIGTRAMP_TAIL 7 /* length of tail after RA */
+
+/* If THIS_FRAME is a sigtramp routine, return the address of the
+ start of the routine. Otherwise, return 0. */
+
+static CORE_ADDR
+amd64_gnu_sigtramp_start (frame_info_ptr this_frame)
+{
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ gdb_byte buf[GNU_SIGTRAMP_LEN];
+
+ if (!safe_frame_unwind_memory (this_frame,
+ pc + GNU_SIGTRAMP_TAIL - GNU_SIGTRAMP_LEN,
+ buf))
+ return 0;
+
+ if (memcmp (buf, gnu_sigtramp_code, GNU_SIGTRAMP_LEN) != 0)
+ return 0;
+
+ return pc;
+}
+
+/* Return whether THIS_FRAME corresponds to a Hurd sigtramp routine. */
+
+static int
+amd64_gnu_sigtramp_p (const frame_info_ptr &this_frame)
+{
+ CORE_ADDR pc = get_frame_pc (this_frame);
+ const char *name;
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+
+ /* If we have a NAME, we can check for the trampoline function */
+ if (name != NULL && strcmp (name, "trampoline") == 0)
+ return 1;
+
+ return amd64_gnu_sigtramp_start (this_frame) != 0;
+}
+
+/* Offset to sc_i386_thread_state in sigcontext, from <bits/sigcontext.h>. */
+#define AMD64_GNU_SIGCONTEXT_THREAD_STATE_OFFSET 32
+
+/* Assuming THIS_FRAME is a Hurd sigtramp routine, return the
+ address of the associated sigcontext structure. */
+
+static CORE_ADDR
+amd64_gnu_sigcontext_addr (const frame_info_ptr &this_frame)
+{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR pc;
+ CORE_ADDR sp;
+ gdb_byte buf[8];
+
+ get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
+ sp = extract_unsigned_integer (buf, 8, byte_order);
+
+ pc = amd64_gnu_sigtramp_start (this_frame);
+ if (pc)
+ {
+ CORE_ADDR sigcontext_addr;
+
+ /* The sigcontext structure address is passed as the third argument
+ * of the signal handler but %RDX is not saved across calls. Luckily,
+ * the structured is saved underneath the &__sigreturn and a dummy word
+ * to fill the slot for the address for __sigreturn to return to.
+ */
+ read_memory (sp + 16, buf, 8);
+ sigcontext_addr = extract_unsigned_integer (buf, 8, byte_order);
+ return sigcontext_addr + AMD64_GNU_SIGCONTEXT_THREAD_STATE_OFFSET;
+ }
+
+ error (_("Couldn't recognize signal trampoline."));
+ return 0;
+}
+
+/* Mapping between the general-purpose registers in `struct
+ sigcontext' format (starting at sc_i386_thread_state)
+ and GDB's register cache layout. */
+
+/* From <bits/sigcontext.h>. */
+static int amd64_gnu_sc_reg_offset[] =
+{
+ 15 * 8, /* %rax */
+ 12 * 8, /* %rbx */
+ 14 * 8, /* %rcx */
+ 13 * 8, /* %rdx */
+ 10 * 8, /* %rsi */
+ 9 * 8, /* %rdi */
+ 10 * 8, /* %rbp */
+ 11 * 8, /* %rsp */
+ 0 * 8, /* %r8 ... */
+ 8 * 8,
+ 7 * 8,
+ 6 * 8,
+ 3 * 8,
+ 2 * 8,
+ 1 * 8,
+ 0 * 8, /* ... %r15 */
+ 16 * 8, /* %rip */
+ 18 * 8, /* %eflags */
+ 17 * 8, /* %cs */
+};
+
+/* From <sys/ucontext.h>. */
+static int amd64_gnu_gregset_reg_offset[] =
+{
+ 10 * 8, /* %rax */
+ 5 * 8, /* %rbx */
+ 11 * 8, /* %rcx */
+ 12 * 8, /* %rdx */
+ 13 * 8, /* %rsi */
+ 14 * 8, /* %rdi */
+ 4 * 8, /* %rbp */
+ 19 * 8, /* %rsp */
+ 9 * 8, /* %r8 ... */
+ 8 * 8,
+ 7 * 8,
+ 6 * 8,
+ 3 * 8,
+ 2 * 8,
+ 1 * 8,
+ 0 * 8, /* ... %r15 */
+ 16 * 8, /* %rip */
+ 18 * 8, /* %eflags */
+ 17 * 8, /* %cs */
+ -1, /* %ss */
+ -1, /* %ds */
+ -1, /* %es */
+ -1, /* %fs */
+ -1, /* %gs */
+};
+
+static void
+amd64_gnu_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ i386_gdbarch_tdep *tdep = gdbarch_tdep<i386_gdbarch_tdep> (gdbarch);
+
+ amd64_init_abi (info, gdbarch,
+ amd64_target_description (X86_XSTATE_SSE_MASK, true));
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+
+ /* Hurd uses SVR4-style shared libraries. */
+ set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+
+ /* Hurd uses the dynamic linker included in the GNU C Library. */
+ set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
+
+ tdep->gregset_reg_offset = amd64_gnu_gregset_reg_offset;
+ tdep->gregset_num_regs = ARRAY_SIZE (amd64_gnu_gregset_reg_offset);
+ tdep->sizeof_gregset = 21 * 8; /* sizeof (struct i386_thread_state); */
+
+ tdep->sigtramp_p = amd64_gnu_sigtramp_p;
+ tdep->sigcontext_addr = amd64_gnu_sigcontext_addr;
+ tdep->sc_reg_offset = amd64_gnu_sc_reg_offset;
+ tdep->sc_num_regs = ARRAY_SIZE (amd64_gnu_sc_reg_offset);
+
+ /* Hurd uses SVR4-style shared libraries. */
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
+}
+
+void _initialize_amd64_gnu_tdep ();
+void
+_initialize_amd64_gnu_tdep ()
+{
+ gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64,
+ GDB_OSABI_HURD, amd64_gnu_init_abi);
+}
#include "floatformat.h"
#include "regcache.h"
+
+#ifdef __x86_64__
+#include "amd64-tdep.h"
+#include "amd64-nat.h"
+#else
#include "i386-tdep.h"
+#endif
#include "inf-child.h"
#include "i387-tdep.h"
/* Offset to the thread_state_t location where REG is stored. */
#define REG_OFFSET(reg) offsetof (struct i386_thread_state, reg)
+#ifdef __x86_64__
+
/* At REG_OFFSET[N] is the offset to the thread_state_t location where
the GDB register N is stored. */
-static int reg_offset[] =
+static int amd64_gnu_thread_state_reg_offset[] =
{
- REG_OFFSET (eax), REG_OFFSET (ecx), REG_OFFSET (edx), REG_OFFSET (ebx),
- REG_OFFSET (uesp), REG_OFFSET (ebp), REG_OFFSET (esi), REG_OFFSET (edi),
- REG_OFFSET (eip), REG_OFFSET (efl), REG_OFFSET (cs), REG_OFFSET (ss),
- REG_OFFSET (ds), REG_OFFSET (es), REG_OFFSET (fs), REG_OFFSET (gs)
+ REG_OFFSET (rax), /* %rax */
+ REG_OFFSET (rbx), /* %rbx */
+ REG_OFFSET (rcx), /* %rcx */
+ REG_OFFSET (rdx), /* %rdx */
+ REG_OFFSET (rsi), /* %rsi */
+ REG_OFFSET (rdi), /* %rdi */
+ REG_OFFSET (rbp), /* %rbp */
+ REG_OFFSET (ursp), /* %rsp */
+ REG_OFFSET (r8), /* %r8 ... */
+ REG_OFFSET (r9),
+ REG_OFFSET (r10),
+ REG_OFFSET (r11),
+ REG_OFFSET (r12),
+ REG_OFFSET (r13),
+ REG_OFFSET (r14),
+ REG_OFFSET (r15), /* ... %r15 */
+ REG_OFFSET (rip), /* %rip */
+ REG_OFFSET (rfl), /* %rflags */
+ REG_OFFSET (cs) /* %cs */
};
-#define REG_ADDR(state, regnum) ((char *)(state) + reg_offset[regnum])
+static const int amd64_gnu_thread_state_num_regs =
+ ARRAY_SIZE (amd64_gnu_thread_state_reg_offset);
+
+#define REG_ADDR(state, regnum) \
+ ((char *)(state) + amd64_gnu_thread_state_reg_offset[regnum])
+#define VALID_REGISTER(regnum) \
+ ((regnum) >= 0 && (regnum) < amd64_gnu_thread_state_num_regs)
+#define NUM_GREGS amd64_gnu_thread_state_num_regs
+#define FLAGS_REGISTER rfl
+
+#else
+
+/* At REG_OFFSET[N] is the offset to the thread_state_t location where
+ the GDB register N is stored. */
+static int i386_gnu_thread_state_reg_offset[] =
+{
+ REG_OFFSET (eax), /* %eax */
+ REG_OFFSET (ecx), /* %ecx */
+ REG_OFFSET (edx), /* %edx */
+ REG_OFFSET (ebx), /* %ebx */
+ REG_OFFSET (uesp), /* %esp */
+ REG_OFFSET (ebp), /* %ebp */
+ REG_OFFSET (esi), /* %esi */
+ REG_OFFSET (edi), /* %edi */
+ REG_OFFSET (eip), /* %eip */
+ REG_OFFSET (efl), /* %efl */
+ REG_OFFSET (cs), /* %cs */
+ REG_OFFSET (ss), /* %ss */
+ REG_OFFSET (ds), /* %ds */
+ REG_OFFSET (es), /* %es */
+ REG_OFFSET (fs), /* %fs */
+ REG_OFFSET (gs) /* gs */
+};
+
+static const int i386_gnu_thread_state_num_regs =
+ ARRAY_SIZE (i386_gnu_thread_state_reg_offset);
+
+#define REG_ADDR(state, regnum) \
+ ((char *)(state) + i386_gnu_thread_state_reg_offset[regnum])
+#define VALID_REGISTER(regnum) \
+ ((regnum) >= 0 && (regnum) < i386_gnu_thread_state_num_regs)
+#define NUM_GREGS i386_gnu_thread_state_num_regs
+#define FLAGS_REGISTER efl
+
+#endif /* __x86_64__ */
\f
-/* The i386 GNU Hurd target. */
+/* The x86 GNU Hurd target. */
#ifdef i386_DEBUG_STATE
using gnu_base_target = x86_nat_target<gnu_nat_target>;
using gnu_base_target = gnu_nat_target;
#endif
-struct i386_gnu_nat_target final : public gnu_base_target
+struct x86_gnu_nat_target final : public gnu_base_target
{
void fetch_registers (struct regcache *, int) override;
void store_registers (struct regcache *, int) override;
};
-static i386_gnu_nat_target the_i386_gnu_nat_target;
+static x86_gnu_nat_target the_x86_gnu_nat_target;
/* Get the whole floating-point state of THREAD and record the values
of the corresponding (pseudo) registers. */
/* Fetch register REGNO, or all regs if REGNO is -1. */
void
-i386_gnu_nat_target::fetch_registers (struct regcache *regcache, int regno)
+x86_gnu_nat_target::fetch_registers (struct regcache *regcache, int regno)
{
struct proc *thread;
ptid_t ptid = regcache->ptid ();
error (_("Can't fetch registers from thread %s: No such thread"),
target_pid_to_str (ptid).c_str ());
- if (regno < I386_NUM_GREGS || regno == -1)
+ if (VALID_REGISTER (regno) || regno == -1)
{
thread_state_t state;
proc_debug (thread, "fetching all register");
- for (i = 0; i < I386_NUM_GREGS; i++)
+ for (i = 0; i < NUM_GREGS; i++)
regcache->raw_supply (i, REG_ADDR (state, i));
thread->fetched_regs = ~0;
}
}
}
- if (regno >= I386_NUM_GREGS || regno == -1)
+ if (!VALID_REGISTER(regno) || regno == -1)
{
proc_debug (thread, "fetching floating-point registers");
/* Store at least register REGNO, or all regs if REGNO == -1. */
void
-i386_gnu_nat_target::store_registers (struct regcache *regcache, int regno)
+x86_gnu_nat_target::store_registers (struct regcache *regcache, int regno)
{
struct proc *thread;
struct gdbarch *gdbarch = regcache->arch ();
error (_("Couldn't store registers into thread %s: No such thread"),
target_pid_to_str (ptid).c_str ());
- if (regno < I386_NUM_GREGS || regno == -1)
+ if (VALID_REGISTER (regno) || regno == -1)
{
thread_state_t state;
thread_state_data_t old_state;
/* Save the T bit. We might try to restore the %eflags register
below, but changing the T bit would seriously confuse GDB. */
- trace = ((struct i386_thread_state *)state)->efl & 0x100;
+ trace = ((struct i386_thread_state *)state)->FLAGS_REGISTER & 0x100;
if (!was_aborted && was_valid)
/* See which registers have changed after aborting the thread. */
{
int check_regno;
- for (check_regno = 0; check_regno < I386_NUM_GREGS; check_regno++)
+ for (check_regno = 0; check_regno < NUM_GREGS; check_regno++)
if ((thread->fetched_regs & (1 << check_regno))
&& memcpy (REG_ADDR (&old_state, check_regno),
REG_ADDR (state, check_regno),
proc_debug (thread, "storing all registers");
- for (i = 0; i < I386_NUM_GREGS; i++)
+ for (i = 0; i < NUM_GREGS; i++)
if (REG_VALID == regcache->get_register_status (i))
regcache->raw_collect (i, REG_ADDR (state, i));
}
}
/* Restore the T bit. */
- ((struct i386_thread_state *)state)->efl &= ~0x100;
- ((struct i386_thread_state *)state)->efl |= trace;
+ ((struct i386_thread_state *)state)->FLAGS_REGISTER &= ~0x100;
+ ((struct i386_thread_state *)state)->FLAGS_REGISTER |= trace;
}
- if (regno >= I386_NUM_GREGS || regno == -1)
+ if (!VALID_REGISTER (regno) || regno == -1)
{
proc_debug (thread, "storing floating-point registers");
/* Get debug registers for thread THREAD. */
static void
-i386_gnu_dr_get (struct i386_debug_state *regs, struct proc *thread)
+x86_gnu_dr_get (struct i386_debug_state *regs, struct proc *thread)
{
mach_msg_type_number_t count = i386_DEBUG_STATE_COUNT;
kern_return_t err;
/* Set debug registers for thread THREAD. */
static void
-i386_gnu_dr_set (const struct i386_debug_state *regs, struct proc *thread)
+x86_gnu_dr_set (const struct i386_debug_state *regs, struct proc *thread)
{
kern_return_t err;
/* Set DR_CONTROL in THREAD. */
static void
-i386_gnu_dr_set_control_one (struct proc *thread, void *arg)
+x86_gnu_dr_set_control_one (struct proc *thread, void *arg)
{
unsigned long *control = (unsigned long *) arg;
struct i386_debug_state regs;
- i386_gnu_dr_get (®s, thread);
+ x86_gnu_dr_get (®s, thread);
regs.dr[DR_CONTROL] = *control;
- i386_gnu_dr_set (®s, thread);
+ x86_gnu_dr_set (®s, thread);
}
/* Set DR_CONTROL to CONTROL in all threads. */
static void
-i386_gnu_dr_set_control (unsigned long control)
+x86_gnu_dr_set_control (unsigned long control)
{
inf_update_procs (gnu_current_inf);
- inf_threads (gnu_current_inf, i386_gnu_dr_set_control_one, &control);
+ inf_threads (gnu_current_inf, x86_gnu_dr_set_control_one, &control);
}
/* Parameters to set a debugging address. */
/* Set address REGNUM (zero based) to ADDR in THREAD. */
static void
-i386_gnu_dr_set_addr_one (struct proc *thread, void *arg)
+x86_gnu_dr_set_addr_one (struct proc *thread, void *arg)
{
struct reg_addr *reg_addr = (struct reg_addr *) arg;
struct i386_debug_state regs;
- i386_gnu_dr_get (®s, thread);
+ x86_gnu_dr_get (®s, thread);
regs.dr[reg_addr->regnum] = reg_addr->addr;
- i386_gnu_dr_set (®s, thread);
+ x86_gnu_dr_set (®s, thread);
}
/* Set address REGNUM (zero based) to ADDR in all threads. */
static void
-i386_gnu_dr_set_addr (int regnum, CORE_ADDR addr)
+x86_gnu_dr_set_addr (int regnum, CORE_ADDR addr)
{
struct reg_addr reg_addr;
reg_addr.addr = addr;
inf_update_procs (gnu_current_inf);
- inf_threads (gnu_current_inf, i386_gnu_dr_set_addr_one, ®_addr);
+ inf_threads (gnu_current_inf, x86_gnu_dr_set_addr_one, ®_addr);
}
/* Get debug register REGNUM value from only the one LWP of PTID. */
static unsigned long
-i386_gnu_dr_get_reg (ptid_t ptid, int regnum)
+x86_gnu_dr_get_reg (ptid_t ptid, int regnum)
{
struct i386_debug_state regs;
struct proc *thread;
inf_update_procs (gnu_current_inf);
thread = inf_tid_to_thread (gnu_current_inf, ptid.lwp ());
- i386_gnu_dr_get (®s, thread);
+ x86_gnu_dr_get (®s, thread);
return regs.dr[regnum];
}
/* Return the inferior's debug register REGNUM. */
static CORE_ADDR
-i386_gnu_dr_get_addr (int regnum)
+x86_gnu_dr_get_addr (int regnum)
{
gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
- return i386_gnu_dr_get_reg (inferior_ptid, regnum);
+ return x86_gnu_dr_get_reg (inferior_ptid, regnum);
}
/* Get DR_STATUS from only the one thread of INFERIOR_PTID. */
static unsigned long
-i386_gnu_dr_get_status (void)
+x86_gnu_dr_get_status (void)
{
- return i386_gnu_dr_get_reg (inferior_ptid, DR_STATUS);
+ return x86_gnu_dr_get_reg (inferior_ptid, DR_STATUS);
}
/* Return the inferior's DR7 debug control register. */
static unsigned long
-i386_gnu_dr_get_control (void)
+x86_gnu_dr_get_control (void)
{
- return i386_gnu_dr_get_reg (inferior_ptid, DR_CONTROL);
+ return x86_gnu_dr_get_reg (inferior_ptid, DR_CONTROL);
}
#endif /* i386_DEBUG_STATE */
-void _initialize_i386gnu_nat ();
+void _initialize_x86_gnu_nat ();
void
-_initialize_i386gnu_nat ()
+_initialize_x86_gnu_nat ()
{
#ifdef i386_DEBUG_STATE
- x86_dr_low.set_control = i386_gnu_dr_set_control;
+ x86_dr_low.set_control = x86_gnu_dr_set_control;
gdb_assert (DR_FIRSTADDR == 0 && DR_LASTADDR < i386_DEBUG_STATE_COUNT);
- x86_dr_low.set_addr = i386_gnu_dr_set_addr;
- x86_dr_low.get_addr = i386_gnu_dr_get_addr;
- x86_dr_low.get_status = i386_gnu_dr_get_status;
- x86_dr_low.get_control = i386_gnu_dr_get_control;
+ x86_dr_low.set_addr = x86_gnu_dr_set_addr;
+ x86_dr_low.get_addr = x86_gnu_dr_get_addr;
+ x86_dr_low.get_status = x86_gnu_dr_get_status;
+ x86_dr_low.get_control = x86_gnu_dr_get_control;
+#ifdef __x86_64__
+ x86_set_debug_register_length (8);
+#else
x86_set_debug_register_length (4);
+#endif
#endif /* i386_DEBUG_STATE */
- gnu_target = &the_i386_gnu_nat_target;
+ gnu_target = &the_x86_gnu_nat_target;
/* Register the target. */
- add_inf_child_target (&the_i386_gnu_nat_target);
+ add_inf_child_target (&the_x86_gnu_nat_target);
}
projects / thirdparty / binutils-gdb.git / commitdiff
