diff options
Diffstat (limited to 'gcc/config/i386/linux-unwind.h')
| -rw-r--r-- | gcc/config/i386/linux-unwind.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/config/i386/linux-unwind.h b/gcc/config/i386/linux-unwind.h index 89f238a..36ee370 100644 --- a/gcc/config/i386/linux-unwind.h +++ b/gcc/config/i386/linux-unwind.h @@ -172,6 +172,25 @@ x86_fallback_frame_state (struct _Unwind_Context *context, fs->signal_frame = 1; return _URC_NO_REASON; } + +#define MD_FROB_UPDATE_CONTEXT x86_frob_update_context + +/* Fix up for kernels that have vDSO, but don't have S flag in it. */ + +static void +x86_frob_update_context (struct _Unwind_Context *context, + _Unwind_FrameState *fs ATTRIBUTE_UNUSED) +{ + unsigned char *pc = context->ra; + + /* movl $__NR_rt_sigreturn,%eax ; {int $0x80 | syscall} */ + if (*(unsigned char *)(pc+0) == 0xb8 + && *(unsigned int *)(pc+1) == 173 + && (*(unsigned short *)(pc+5) == 0x80cd + || *(unsigned short *)(pc+5) == 0x050f)) + _Unwind_SetSignalFrame (context, 1); +} + #endif /* not glibc 2.0 */ #endif /* ifdef __x86_64__ */ #endif /* ifdef inhibit_libc */ |