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Diagnostics: SIGSEGV logger also lists code addresses on the stack

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The412Banner committed 2026-10-02 19:31:24 -04:00
1 parent 5f4b62fc8b
commit 8ecadacd12
1 file changed
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tools/diag/segvlog.c
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@@ -38,6 +38,16 @@ static void handler(int sig, siginfo_t *si, void *ctx) {
snprintf(buf, sizeof buf, "=== pid %d signal %d code %d fault addr %p\n", getpid(), sig, si->si_code, si->si_addr);
if (out >= 0) write(out, buf, strlen(buf));
line("pc", pc);
// Leaf functions (strlen, memcpy) keep no frame: the caller's return address is on the stack.
#if defined(__i386__)
void **sp = (void **)uc->uc_mcontext.gregs[REG_ESP];
#else
void **sp = (void **)uc->uc_mcontext.gregs[REG_RSP];
#endif
for (int i = 0; i < 48 && sp; i++) {
Dl_info di;
if (sp[i] && dladdr(sp[i], &di) && di.dli_fname) line(" sp", sp[i]);
}
for (int i = 0; i < 24 && fp && ((unsigned long)fp & 3) == 0; i++) {
void *ret = fp[1];
if (!ret) break;