diff options
Diffstat (limited to 'gcc-4.9/libsanitizer/asan/asan_linux.cc')
| -rw-r--r-- | gcc-4.9/libsanitizer/asan/asan_linux.cc | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/gcc-4.9/libsanitizer/asan/asan_linux.cc b/gcc-4.9/libsanitizer/asan/asan_linux.cc new file mode 100644 index 000000000..0692eb1f4 --- /dev/null +++ b/gcc-4.9/libsanitizer/asan/asan_linux.cc @@ -0,0 +1,128 @@ +//===-- 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. +//===----------------------------------------------------------------------===// + +#include "sanitizer_common/sanitizer_platform.h" +#if SANITIZER_LINUX + +#include "asan_interceptors.h" +#include "asan_internal.h" +#include "asan_thread.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 !SANITIZER_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 SANITIZER_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(__hppa__) + ucontext_t *ucontext = (ucontext_t*)context; + *pc = ucontext->uc_mcontext.sc_iaoq[0]; + /* GCC uses %r3 whenever a frame pointer is needed. */ + *bp = ucontext->uc_mcontext.sc_gr[3]; + *sp = ucontext->uc_mcontext.sc_gr[30]; +# 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(__powerpc__) || defined(__powerpc64__) + ucontext_t *ucontext = (ucontext_t*)context; + *pc = ucontext->uc_mcontext.regs->nip; + *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; + // The powerpc{,64}-linux ABIs do not specify r31 as the frame + // pointer, but GCC always uses r31 when we need a frame pointer. + *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; +# 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 +# elif defined(__mips__) + ucontext_t *ucontext = (ucontext_t*)context; + *pc = ucontext->uc_mcontext.gregs[31]; + *bp = ucontext->uc_mcontext.gregs[30]; + *sp = ucontext->uc_mcontext.gregs[29]; +#else +# error "Unsupported arch" +#endif +} + +bool AsanInterceptsSignal(int signum) { + return signum == SIGSEGV && flags()->handle_segv; +} + +void AsanPlatformThreadInit() { + // Nothing here for now. +} + +#if !SANITIZER_ANDROID +void ReadContextStack(void *context, uptr *stack, uptr *ssize) { + ucontext_t *ucp = (ucontext_t*)context; + *stack = (uptr)ucp->uc_stack.ss_sp; + *ssize = ucp->uc_stack.ss_size; +} +#else +void ReadContextStack(void *context, uptr *stack, uptr *ssize) { + UNIMPLEMENTED(); +} +#endif + +} // namespace __asan + +#endif // SANITIZER_LINUX |