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2004-03-24 Andrew Cagney <cagney@redhat.com>

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* tramp-frame.h (TRAMP_SENTINEL_INSN): Define, document.
	* tramp-frame.c: Include "gdb_assert.h".
	(tramp_frame_start): Use TRAMP_SENTINEL_INSN.  Use ULONGEST and
	correct sizeof.
	(tramp_frame_append): Validate the tramp frame's instructions.
	* Makefile.in (tramp-frame.o): Update dependencies.
This commit is contained in:
Andrew Cagney 2004-03-24 23:14:39 +00:00
parent 38f443c80e
commit 1196bfdaf9
3 changed files with 30 additions and 5 deletions
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9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2004-03-24 Andrew Cagney <cagney@redhat.com>
* tramp-frame.h (TRAMP_SENTINEL_INSN): Define, document.
* tramp-frame.c: Include "gdb_assert.h".
(tramp_frame_start): Use TRAMP_SENTINEL_INSN. Use ULONGEST and
correct sizeof.
(tramp_frame_append): Validate the tramp frame's instructions.
* Makefile.in (tramp-frame.o): Update dependencies.
2004-03-23 Andrew Cagney <cagney@redhat.com>
* trad-frame.h (trad_frame_set_reg_addr): Declare.

19
gdb/tramp-frame.c
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@ -28,6 +28,7 @@
#include "target.h"
#include "trad-frame.h"
#include "frame-base.h"
#include "gdb_assert.h"
struct frame_data
{
@ -89,15 +90,15 @@ tramp_frame_start (CORE_ADDR pc, const struct tramp_frame *tramp)
int ti;
/* Search through the trampoline for one that matches the
instruction sequence around PC. */
for (ti = 0; tramp->insn[ti] != 0; ti++)
for (ti = 0; tramp->insn[ti] != TRAMP_SENTINEL_INSN; ti++)
{
CORE_ADDR func = pc - tramp->insn_size * ti;
int i;
for (i = 0; 1; i++)
{
bfd_byte buf[sizeof (LONGEST)];
CORE_ADDR insn;
if (tramp->insn[i] == 0)
bfd_byte buf[sizeof (tramp->insn[0])];
ULONGEST insn;
if (tramp->insn[i] == TRAMP_SENTINEL_INSN)
return func;
if (target_read_memory (func + i * tramp->insn_size, buf,
tramp->insn_size) != 0)
@ -148,6 +149,16 @@ tramp_frame_append (struct gdbarch *gdbarch,
{
struct frame_data *data;
struct frame_unwind *unwinder;
int i;
/* Check that the instruction sequence contains a sentinel. */
for (i = 0; i < ARRAY_SIZE (tramp_frame->insn); i++)
{
if (tramp_frame->insn[i] == TRAMP_SENTINEL_INSN)
break;
}
gdb_assert (i < ARRAY_SIZE (tramp_frame->insn));
gdb_assert (tramp_frame->insn_size <= sizeof (tramp_frame->insn[0]));
data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_data);
unwinder = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind);

7
gdb/tramp-frame.h
View File

@ -39,6 +39,10 @@ struct trad_frame_cache;
/* A trampoline descriptor. */
/* Magic instruction that to mark the end of the signal trampoline
instruction sequence. */
#define TRAMP_SENTINEL_INSN ((LONGEST) -1)
struct tramp_frame
{
/* The trampoline's entire instruction sequence. Search for this in
@ -47,7 +51,8 @@ struct tramp_frame
one INSN_SIZE instruction. It is also assumed that TRAMP[0]
contains the first instruction of the trampoline and hence the
address of the instruction matching TRAMP[0] is the trampoline's
"func" address. */
"func" address. The instruction sequence shall be terminated by
TRAMP_SENTINEL_INSN. */
int insn_size;
ULONGEST insn[8];
/* Initialize a trad-frame cache corresponding to the tramp-frame.