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Check for NULL link registers as found in initial stack frames when doing

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stack unwinding, instead of naively trying to check the instruction at
that location. This fixes signal handling in threaded applications after
recent changes regarding unwinding in libthr. While here, clean up our
MD_FROB_UPDATE_CONTEXT() implementation a little.
This commit is contained in:
Nathan Whitehorn 2010-09-26 14:20:09 +00:00
parent b71de2e057
commit a9f035fdd9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=213185
1 changed files with 5 additions and 6 deletions
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11
contrib/gcc/config/rs6000/freebsd.h
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@ -219,17 +219,16 @@
| (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4)) \
: DW_EH_PE_absptr)
#ifdef __powerpc64__
#define MD_FROB_UPDATE_CONTEXT(CTX, FS) \
if (TARGET_64BIT) { \
if ((FS)->regs.reg[2].how == REG_UNSAVED) \
{ \
unsigned int *insn \
= (unsigned int *) \
unsigned int *insn = (unsigned int *) \
_Unwind_GetGR ((CTX), LINK_REGISTER_REGNUM); \
if (*insn == 0xE8410028) \
if (insn != NULL && *insn == 0xE8410028) \
_Unwind_SetGRPtr ((CTX), 2, (CTX)->cfa + 40); \
} \
}
}
#endif
/* FreeBSD doesn't support saving and restoring 64-bit regs with a 32-bit
kernel. This is supported when running on a 64-bit kernel with