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OSX: Remove use of sigaltstack

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This commit is contained in:
Jonathan G Rennison
2019-11-05 17:57:58 +00:00
parent 2ccd3fb5c7
commit a7404a88bd
2 changed files with 0 additions and 65 deletions
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38
src/os/macosx/crashlog_osx.cpp
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@@ -27,9 +27,6 @@
#ifdef WITH_UCONTEXT
#include <sys/ucontext.h>
#endif
#if defined(WITH_SIGALTSTACK) && defined(WITH_UCONTEXT)
#include <pthread.h>
#endif
#include "../../safeguards.h"
@@ -218,30 +215,6 @@ class CrashLogOSX : public CrashLog {
#if defined(__ppc__) || defined(__ppc64__)
/* Apple says __builtin_frame_address can be broken on PPC. */
__asm__ volatile("mr %0, r1" : "=r" (frame));
#elif defined(WITH_SIGALTSTACK) && defined(WITH_UCONTEXT) && (defined(__x86_64__) || defined(__i386))
if (this->signal_instruction_ptr_valid) {
print_frame(this->signal_instruction_ptr);
i++;
}
pthread_t self = pthread_self();
char *stacktop = (char *) pthread_get_stackaddr_np(self);
char *stackbot = stacktop - pthread_get_stacksize_np(self);
stacktop -= 2 * sizeof(void *);
ucontext_t *ucontext = static_cast<ucontext_t *>(context);
#if defined(__x86_64__)
void **bp = (void **) ucontext->uc_mcontext->__ss.__rbp;
void **sp = (void **) ucontext->uc_mcontext->__ss.__rsp;
#else
void **bp = (void **) ucontext->uc_mcontext->__ss.__ebp;
void **sp = (void **) ucontext->uc_mcontext->__ss.__esp;
#endif
if (IS_ALIGNED(bp) && reinterpret_cast<uintptr_t>(bp) >= reinterpret_cast<uintptr_t>(sp) && reinterpret_cast<uintptr_t>(bp) >= reinterpret_cast<uintptr_t>(stackbot) && reinterpret_cast<uintptr_t>(bp) <= reinterpret_cast<uintptr_t>(stacktop)) {
frame = bp;
} else {
frame = nullptr;
}
#else
frame = (void **)__builtin_frame_address(0);
#endif
@@ -495,21 +468,10 @@ void CDECL HandleCrash(int signum, siginfo_t *si, void *context)
/* static */ void CrashLog::InitialiseCrashLog()
{
#if defined(WITH_SIGALTSTACK) && defined(WITH_UCONTEXT)
const size_t stack_size = max<size_t>(SIGSTKSZ, 512*1024);
stack_t ss;
ss.ss_sp = CallocT<byte>(stack_size);
ss.ss_size = stack_size;
ss.ss_flags = 0;
sigaltstack(&ss, nullptr);
#endif
for (const int *i = _signals_to_handle; i != endof(_signals_to_handle); i++) {
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_SIGINFO | SA_RESTART;
#if defined(WITH_SIGALTSTACK) && defined(WITH_UCONTEXT)
sa.sa_flags |= SA_ONSTACK;
#endif
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = HandleCrash;
sigaction(*i, &sa, nullptr);