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* amd64-tdep.c (amd64_get_longjmp_target): New.

Browse source 
(amd64_init_abi): Register amd64_get_longjmp_target as
	gdbarch_get_longjmp_target callback.
	* i386-tdep.c (i386_get_longjmp_target): Remove 64-bit handling.
This commit is contained in:
Pedro Alves 2008-04-25 14:57:30 +00:00
parent ddeca4680f
commit 436675d3af
3 changed files with 47 additions and 13 deletions
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7
gdb/ChangeLog
View file

@ -1,3 +1,10 @@
2008-04-25 Pedro Alves <pedro@codesourcery.com>
* amd64-tdep.c (amd64_get_longjmp_target): New.
(amd64_init_abi): Register amd64_get_longjmp_target as
gdbarch_get_longjmp_target callback.
* i386-tdep.c (i386_get_longjmp_target): Remove 64-bit handling.
2008-04-25 Pedro Alves <pedro@codesourcery.com>
* breakpoint.h (enum bpstat_what_main_action): Delete

32
gdb/amd64-tdep.c
View file

@ -1101,6 +1101,36 @@ amd64_regset_from_core_section (struct gdbarch *gdbarch,
}
/* Figure out where the longjmp will land. Slurp the jmp_buf out of
%rdi. We expect its value to be a pointer to the jmp_buf structure
from which we extract the address that we will land at. This
address is copied into PC. This routine returns non-zero on
success. */
static int
amd64_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
gdb_byte buf[8];
CORE_ADDR jb_addr;
struct gdbarch *gdbarch = get_frame_arch (frame);
int jb_pc_offset = gdbarch_tdep (gdbarch)->jb_pc_offset;
int len = TYPE_LENGTH (builtin_type_void_func_ptr);
/* If JB_PC_OFFSET is -1, we have no way to find out where the
longjmp will land. */
if (jb_pc_offset == -1)
return 0;
get_frame_register (frame, AMD64_RDI_REGNUM, buf);
jb_addr = extract_typed_address (buf, builtin_type_void_data_ptr);
if (target_read_memory (jb_addr + jb_pc_offset, buf, len))
return 0;
*pc = extract_typed_address (buf, builtin_type_void_func_ptr);
return 1;
}
void
amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
@ -1174,6 +1204,8 @@ amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
if (tdep->gregset_reg_offset)
set_gdbarch_regset_from_core_section (gdbarch,
amd64_regset_from_core_section);
set_gdbarch_get_longjmp_target (gdbarch, amd64_get_longjmp_target);
}

21
gdb/i386-tdep.c
View file

@ -1295,36 +1295,31 @@ i386_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
stack. We expect the first arg to be a pointer to the jmp_buf
structure from which we extract the address that we will land at.
This address is copied into PC. This routine returns non-zero on
success.
This function is 64-bit safe. */
success. */
static int
i386_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
{
gdb_byte buf[8];
gdb_byte buf[4];
CORE_ADDR sp, jb_addr;
struct gdbarch *gdbarch = get_frame_arch (frame);
int jb_pc_offset = gdbarch_tdep (gdbarch)->jb_pc_offset;
int len = TYPE_LENGTH (builtin_type_void_func_ptr);
/* If JB_PC_OFFSET is -1, we have no way to find out where the
longjmp will land. */
if (jb_pc_offset == -1)
return 0;
/* Don't use I386_ESP_REGNUM here, since this function is also used
for AMD64. */
get_frame_register (frame, gdbarch_sp_regnum (gdbarch), buf);
sp = extract_typed_address (buf, builtin_type_void_data_ptr);
if (target_read_memory (sp + len, buf, len))
get_frame_register (frame, I386_ESP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 4);
if (target_read_memory (sp + 4, buf, 4))
return 0;
jb_addr = extract_typed_address (buf, builtin_type_void_data_ptr);
if (target_read_memory (jb_addr + jb_pc_offset, buf, len))
jb_addr = extract_unsigned_integer (buf, 4);
if (target_read_memory (jb_addr + jb_pc_offset, buf, 4))
return 0;
*pc = extract_typed_address (buf, builtin_type_void_func_ptr);
*pc = extract_unsigned_integer (buf, 4);
return 1;
}