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Enhance GDB's abillity WRT stack traces where signal handlers are involved.

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Correct backtrace was made more complex when the new signal trampoline
was introduced to support more than 32 signals, while keeping a modified
version of the old signal trampoline.

The 'where' command will now show:

	#2  <signal handler called>

where appropiate.

Submitted by:	Tor.Egge@fast.no
This commit is contained in:
obrien 2002-03-27 04:55:43 +00:00
parent 2cf6bc353f
commit 4865cbe281
2 changed files with 53 additions and 4 deletions
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45
gnu/usr.bin/binutils/gdb/i386/freebsd-nat.c
View File

@ -663,3 +663,48 @@ remove_watchpoint(addr, len, type)
}
#endif /* PT_GETDBREGS */
CORE_ADDR
fbsd_sigtramp_saved_pc (frame)
struct frame_info *frame;
{
CORE_ADDR sigcontext_addr;
CORE_ADDR sigcode_addr;
char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT;
int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
int sigcode_offs = (-1 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
/* Get sigcontext address, it is the third parameter on the stack. */
if (frame->next)
sigcontext_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next)
+ FRAME_ARGS_SKIP
+ sigcontext_offs,
ptrbytes);
else
sigcontext_addr = read_memory_integer (read_register (SP_REGNUM)
+ sigcontext_offs,
ptrbytes);
#ifdef OSIGCODE_MAGIC_OFFSET
if (frame->next)
sigcode_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next)
+ FRAME_ARGS_SKIP
+ sigcode_offs,
ptrbytes);
else
sigcode_addr = read_memory_integer (read_register (SP_REGNUM)
+ sigcode_offs,
ptrbytes);
target_read_memory (sigcode_addr + OSIGCODE_MAGIC_OFFSET,
buf, ptrbytes);
if (extract_unsigned_integer(buf, ptrbytes) == 0x01d516) {
target_read_memory (sigcontext_addr + OSIGCONTEXT_PC_OFFSET,
buf, ptrbytes);
} else
#endif
/* Don't cause a memory_error when accessing sigcontext in case the stack
layout has changed or the stack is corrupt. */
target_read_memory (sigcontext_addr + NSIGCONTEXT_PC_OFFSET, buf, ptrbytes);
return extract_unsigned_integer (buf, ptrbytes);
}

12
gnu/usr.bin/binutils/gdb/i386/tm.h
View File

@ -43,18 +43,22 @@ extern CORE_ADDR fbsd_kern_frame_saved_pc (struct frame_info *);
#define FRAME_SAVED_PC(FRAME) \
(kernel_debugging ? fbsd_kern_frame_saved_pc(FRAME) : \
(((FRAME)->signal_handler_caller \
? sigtramp_saved_pc (FRAME) \
? fbsd_sigtramp_saved_pc (FRAME) \
: read_memory_integer ((FRAME)->frame + 4, 4)) \
))
/* On FreeBSD, sigtramp has size 0x18 and is immediately below the
/* On FreeBSD, sigtramp has size 0x48 and is immediately below the
ps_strings struct which has size 0x10 and is at the top of the
user stack. */
#undef SIGTRAMP_START
#undef SIGTRAMP_END
#define SIGTRAMP_START(pc) 0xbfbfdfd8
#define SIGTRAMP_END(pc) 0xbfbfdff0
#define SIGTRAMP_START(pc) 0xbfbfffa8
#define SIGTRAMP_END(pc) 0xbfbffff0
#undef SIGCONTEXT_PC_OFFSET
#define OSIGCONTEXT_PC_OFFSET 20
#define NSIGCONTEXT_PC_OFFSET 76
#define OSIGCODE_MAGIC_OFFSET 20
struct objfile;
void freebsd_uthread_new_objfile PARAMS ((struct objfile *objfile));