diff options
Diffstat (limited to 'vm_dump.c')
| -rw-r--r-- | vm_dump.c | 9 |
1 files changed, 7 insertions, 2 deletions
@@ -413,6 +413,7 @@ rb_vmdebug_thread_dump_state(VALUE self) # elif defined(__APPLE__) && defined(__x86_64__) && defined(HAVE_LIBUNWIND_H) # define UNW_LOCAL_ONLY # include <libunwind.h> +# include <sys/mman.h> # undef backtrace int backtrace(void **trace, int size) @@ -439,6 +440,8 @@ darwin_sigtramp: /* darwin's bundled libunwind doesn't support signal trampoline */ { ucontext_t *uctx; + char vec[1]; + int r; /* get _sigtramp's ucontext_t and set values to cursor * http://www.opensource.apple.com/source/Libc/Libc-825.25/i386/sys/_sigtramp.s * http://www.opensource.apple.com/source/libunwind/libunwind-35.1/src/unw_getcontext.s @@ -462,8 +465,10 @@ darwin_sigtramp: unw_set_reg(&cursor, UNW_X86_64_R14, uctx->uc_mcontext->__ss.__r14); unw_set_reg(&cursor, UNW_X86_64_R15, uctx->uc_mcontext->__ss.__r15); ip = uctx->uc_mcontext->__ss.__rip; - if (!ip || (((char*)ip)[-2] == 0x0f && ((char*)ip)[-1] == 5)) { - /* NULL reference or signal received in syscall */ + r = mincore((const void *)ip, 1, vec); + if (r || !vec[0] || memcmp((const char *)ip-2, "\x0f\x05", 2) == 0) { + /* if segv is caused by invalid call or signal received in syscall */ + /* the frame is invalid; skip */ trace[n++] = (void *)ip; ip = *(unw_word_t*)uctx->uc_mcontext->__ss.__rsp; } |