diff options
Diffstat (limited to 'libsanitizer/asan/asan_linux.cc')
-rw-r--r-- | libsanitizer/asan/asan_linux.cc | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/libsanitizer/asan/asan_linux.cc b/libsanitizer/asan/asan_linux.cc new file mode 100644 index 00000000000..2922740e7f2 --- /dev/null +++ b/libsanitizer/asan/asan_linux.cc @@ -0,0 +1,150 @@ +//===-- asan_linux.cc -----------------------------------------------------===// +// +// 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]; +#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__ |