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gdb: xtensa: fix frame initialization when PC is invalid 

When gdb is used on core dump and PC is not pointing to a readable
memory read_memory_integer call in the xtensa_frame_cache throws an
error, making register inspection/backtracing impossible in that thread.

Use safe_read_memory_integer instead.

2016-03-29  Max Filippov  <jcmvbkbc@gmail.com>
gdb/
	* xtensa-tdep.c (xtensa_frame_cache): Change op1 type to LONGEST.
	Use safe_read_memory_integer instead of read_memory_integer.
This commit is contained in:
Max Filippov 2016-03-27 20:45:54 +03:00
parent c37c0ba69b
commit a08b52b5c4
2 changed files with 8 additions and 3 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2016-03-29 Max Filippov <jcmvbkbc@gmail.com>
* xtensa-tdep.c (xtensa_frame_cache): Change op1 type to LONGEST.
Use safe_read_memory_integer instead of read_memory_integer.
2016-03-29 Marcin Kościelnicki <koriakin@0x04.net>
* NEWS: Mention support for tracepoints on s390*-linux.

6
gdb/xtensa-tdep.c
View File

@ -1285,7 +1285,7 @@ xtensa_frame_cache (struct frame_info *this_frame, void **this_cache)
if (windowed)
{
char op1;
LONGEST op1;
/* Get WINDOWBASE, WINDOWSTART, and PS registers. */
wb = get_frame_register_unsigned (this_frame,
@ -1293,8 +1293,8 @@ xtensa_frame_cache (struct frame_info *this_frame, void **this_cache)
ws = get_frame_register_unsigned (this_frame,
gdbarch_tdep (gdbarch)->ws_regnum);
op1 = read_memory_integer (pc, 1, byte_order);
if (XTENSA_IS_ENTRY (gdbarch, op1))
if (safe_read_memory_integer (pc, 1, byte_order, &op1)
&& XTENSA_IS_ENTRY (gdbarch, op1))
{
int callinc = CALLINC (ps);
ra = get_frame_register_unsigned