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//===-- asan_linux.cc -----------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of AddressSanitizer, an address sanity checker.
//
// Linux-specific details.
//===----------------------------------------------------------------------===//
#ifdef __linux__
#include "asan_interceptors.h"
#include "asan_internal.h"
#include "asan_lock.h"
#include "asan_thread.h"
#include "asan_thread_registry.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_procmaps.h"
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <fcntl.h>
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include <unwind.h>
#if !ASAN_ANDROID
// FIXME: where to get ucontext on Android?
#include <sys/ucontext.h>
#endif
extern "C" void* _DYNAMIC;
namespace __asan {
void MaybeReexec() {
// No need to re-exec on Linux.
}
void *AsanDoesNotSupportStaticLinkage() {
// This will fail to link with -static.
return &_DYNAMIC; // defined in link.h
}
void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
#if ASAN_ANDROID
*pc = *sp = *bp = 0;
#elif defined(__arm__)
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.arm_pc;
*bp = ucontext->uc_mcontext.arm_fp;
*sp = ucontext->uc_mcontext.arm_sp;
# elif defined(__x86_64__)
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.gregs[REG_RIP];
*bp = ucontext->uc_mcontext.gregs[REG_RBP];
*sp = ucontext->uc_mcontext.gregs[REG_RSP];
# elif defined(__i386__)
ucontext_t *ucontext = (ucontext_t*)context;
*pc = ucontext->uc_mcontext.gregs[REG_EIP];
*bp = ucontext->uc_mcontext.gregs[REG_EBP];
*sp = ucontext->uc_mcontext.gregs[REG_ESP];
# elif defined(__sparc__)
ucontext_t *ucontext = (ucontext_t*)context;
uptr *stk_ptr;
# if defined (__arch64__)
*pc = ucontext->uc_mcontext.mc_gregs[MC_PC];
*sp = ucontext->uc_mcontext.mc_gregs[MC_O6];
stk_ptr = (uptr *) (*sp + 2047);
*bp = stk_ptr[15];
# else
*pc = ucontext->uc_mcontext.gregs[REG_PC];
*sp = ucontext->uc_mcontext.gregs[REG_O6];
stk_ptr = (uptr *) *sp;
*bp = stk_ptr[15];
# endif
#else
# error "Unsupported arch"
#endif
}
bool AsanInterceptsSignal(int signum) {
return signum == SIGSEGV && flags()->handle_segv;
}
void AsanPlatformThreadInit() {
// Nothing here for now.
}
AsanLock::AsanLock(LinkerInitialized) {
// We assume that pthread_mutex_t initialized to all zeroes is a valid
// unlocked mutex. We can not use PTHREAD_MUTEX_INITIALIZER as it triggers
// a gcc warning:
// extended initializer lists only available with -std=c++0x or -std=gnu++0x
}
void AsanLock::Lock() {
CHECK(sizeof(pthread_mutex_t) <= sizeof(opaque_storage_));
pthread_mutex_lock((pthread_mutex_t*)&opaque_storage_);
CHECK(!owner_);
owner_ = (uptr)pthread_self();
}
void AsanLock::Unlock() {
CHECK(owner_ == (uptr)pthread_self());
owner_ = 0;
pthread_mutex_unlock((pthread_mutex_t*)&opaque_storage_);
}
#ifdef __arm__
#define UNWIND_STOP _URC_END_OF_STACK
#define UNWIND_CONTINUE _URC_NO_REASON
#else
#define UNWIND_STOP _URC_NORMAL_STOP
#define UNWIND_CONTINUE _URC_NO_REASON
#endif
uptr Unwind_GetIP(struct _Unwind_Context *ctx) {
#ifdef __arm__
uptr val;
_Unwind_VRS_Result res = _Unwind_VRS_Get(ctx, _UVRSC_CORE,
15 /* r15 = PC */, _UVRSD_UINT32, &val);
CHECK(res == _UVRSR_OK && "_Unwind_VRS_Get failed");
// Clear the Thumb bit.
return val & ~(uptr)1;
#else
return _Unwind_GetIP(ctx);
#endif
}
_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx,
void *param) {
StackTrace *b = (StackTrace*)param;
CHECK(b->size < b->max_size);
uptr pc = Unwind_GetIP(ctx);
b->trace[b->size++] = pc;
if (b->size == b->max_size) return UNWIND_STOP;
return UNWIND_CONTINUE;
}
void GetStackTrace(StackTrace *stack, uptr max_s, uptr pc, uptr bp) {
stack->size = 0;
stack->trace[0] = pc;
if ((max_s) > 1) {
stack->max_size = max_s;
#ifdef __arm__
_Unwind_Backtrace(Unwind_Trace, stack);
#else
if (!asan_inited) return;
if (AsanThread *t = asanThreadRegistry().GetCurrent())
stack->FastUnwindStack(pc, bp, t->stack_top(), t->stack_bottom());
#endif
}
}
} // namespace __asan
#endif // __linux__
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