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On Thu, May 06, 2004 at 04:54:55PM -0400, Andrew Cagney wrote:
>At present I know of the following problems:
4. backtrace changes:
#0 handler (sig=26, info=0xfeed7c50, context=0xfeed7cd0) at /home/cygnus/cagney
/PENDING/2004-05-06-add-vsyscall/src/gdb/testsuite/gdb.base/siginfo.c:31
#1 0x0093e440 in __kernel_sigreturn ()
#2 0x0804848a in main () at /home/cygnus/cagney/PENDING/2004-05-06-add-vsyscall
/src/gdb/testsuite/gdb.base/siginfo.c:66
vs
#0 handler (sig=26, info=0xfee1ea80, context=0xfee1eb00) at /home/cygnus/cagney
/GDB/src/gdb/testsuite/gdb.base/siginfo.c:31
#1 <signal handler called>
#2 0x0804848a in main () at /home/cygnus/cagney/GDB/src/gdb/testsuite/gdb.base/
but remember I intend changing the second to:
... #1 0x1234 in <signal trampoline> ...
In the meantime, here's the patch from my Debian backport which should fix this. Pending a way to indicate 'abnormal frame' status in the CFI, we don't want to use it; frame_unwind_address_in_block will hit. 2004-01-25 Daniel Jacobowitz <drow@mvista.com>
* i386-tdep.c (i386_gdbarch_init): Check for signal frame first. * i386-linux-tdep.c (i386_linux_pc_in_sigtramp): Handle __kernel_sigreturn.
Index: gdb-6.1/gdb/i386-linux-tdep.c
===================================================================
--- gdb-6.1.orig/gdb/i386-linux-tdep.c 2004-04-05 13:26:42.000000000 -0400
+++ gdb-6.1/gdb/i386-linux-tdep.c 2004-04-05 13:26:46.000000000 -0400
@@ -227,6 +227,10 @@ i386_linux_pc_in_sigtramp (CORE_ADDR pc,
exported from the shared C library, so the trampoline may appear to
be part of the preceding function. This should always be sigaction,
__sigaction, or __libc_sigaction (all aliases to the same function). */
+
+ if (name && strcmp (name, "__kernel_sigreturn") == 0)
+ return 1;
+
if (name == NULL || strstr (name, "sigaction") != NULL)
return (i386_linux_sigtramp_start (pc) != 0
|| i386_linux_rt_sigtramp_start (pc) != 0);
Index: gdb-6.1/gdb/i386-tdep.c
===================================================================
--- gdb-6.1.orig/gdb/i386-tdep.c 2004-04-05 13:26:42.000000000 -0400
+++ gdb-6.1/gdb/i386-tdep.c 2004-04-05 13:26:46.000000000 -0400
@@ -2013,6 +2013,10 @@ i386_gdbarch_init (struct gdbarch_info i
/* Helper for function argument information. */
set_gdbarch_fetch_pointer_argument (gdbarch, i386_fetch_pointer_argument);
+ /* The signal handler might have dwarf2 CFI, via the vsyscall DSO, so check
+ for this first. */
+ frame_unwind_append_sniffer (gdbarch, i386_sigtramp_frame_sniffer);
+
/* Hook in the DWARF CFI frame unwinder. */
frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
@@ -2021,7 +2025,6 @@ i386_gdbarch_init (struct gdbarch_info i
/* Hook in ABI-specific overrides, if they have been registered. */
gdbarch_init_osabi (info, gdbarch);
- frame_unwind_append_sniffer (gdbarch, i386_sigtramp_frame_sniffer);
frame_unwind_append_sniffer (gdbarch, i386_frame_sniffer);
/* If we have a register mapping, enable the generic core file
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