asan_linux.cc revision 40527a579131210fcfa2373620a0c2200800e7c4
1//===-- asan_linux.cc -----------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file is a part of AddressSanitizer, an address sanity checker. 11// 12// Linux-specific details. 13//===----------------------------------------------------------------------===// 14 15#include "sanitizer_common/sanitizer_platform.h" 16#if SANITIZER_LINUX 17 18#include "asan_interceptors.h" 19#include "asan_internal.h" 20#include "asan_thread.h" 21#include "sanitizer_common/sanitizer_libc.h" 22#include "sanitizer_common/sanitizer_procmaps.h" 23 24#include <sys/time.h> 25#include <sys/resource.h> 26#include <sys/mman.h> 27#include <sys/syscall.h> 28#include <sys/types.h> 29#include <fcntl.h> 30#include <pthread.h> 31#include <stdio.h> 32#include <unistd.h> 33#include <unwind.h> 34 35#if !SANITIZER_ANDROID 36// FIXME: where to get ucontext on Android? 37#include <sys/ucontext.h> 38#endif 39 40extern "C" void* _DYNAMIC; 41 42namespace __asan { 43 44void MaybeReexec() { 45 // No need to re-exec on Linux. 46} 47 48void *AsanDoesNotSupportStaticLinkage() { 49 // This will fail to link with -static. 50 return &_DYNAMIC; // defined in link.h 51} 52 53void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) { 54#if SANITIZER_ANDROID 55 *pc = *sp = *bp = 0; 56#elif defined(__arm__) 57 ucontext_t *ucontext = (ucontext_t*)context; 58 *pc = ucontext->uc_mcontext.arm_pc; 59 *bp = ucontext->uc_mcontext.arm_fp; 60 *sp = ucontext->uc_mcontext.arm_sp; 61# elif defined(__x86_64__) 62 ucontext_t *ucontext = (ucontext_t*)context; 63 *pc = ucontext->uc_mcontext.gregs[REG_RIP]; 64 *bp = ucontext->uc_mcontext.gregs[REG_RBP]; 65 *sp = ucontext->uc_mcontext.gregs[REG_RSP]; 66# elif defined(__i386__) 67 ucontext_t *ucontext = (ucontext_t*)context; 68 *pc = ucontext->uc_mcontext.gregs[REG_EIP]; 69 *bp = ucontext->uc_mcontext.gregs[REG_EBP]; 70 *sp = ucontext->uc_mcontext.gregs[REG_ESP]; 71# elif defined(__powerpc__) || defined(__powerpc64__) 72 ucontext_t *ucontext = (ucontext_t*)context; 73 *pc = ucontext->uc_mcontext.regs->nip; 74 *sp = ucontext->uc_mcontext.regs->gpr[PT_R1]; 75 // The powerpc{,64}-linux ABIs do not specify r31 as the frame 76 // pointer, but GCC always uses r31 when we need a frame pointer. 77 *bp = ucontext->uc_mcontext.regs->gpr[PT_R31]; 78# elif defined(__sparc__) 79 ucontext_t *ucontext = (ucontext_t*)context; 80 uptr *stk_ptr; 81# if defined (__arch64__) 82 *pc = ucontext->uc_mcontext.mc_gregs[MC_PC]; 83 *sp = ucontext->uc_mcontext.mc_gregs[MC_O6]; 84 stk_ptr = (uptr *) (*sp + 2047); 85 *bp = stk_ptr[15]; 86# else 87 *pc = ucontext->uc_mcontext.gregs[REG_PC]; 88 *sp = ucontext->uc_mcontext.gregs[REG_O6]; 89 stk_ptr = (uptr *) *sp; 90 *bp = stk_ptr[15]; 91# endif 92# elif defined(__mips__) 93 ucontext_t *ucontext = (ucontext_t*)context; 94 *pc = ucontext->uc_mcontext.gregs[31]; 95 *bp = ucontext->uc_mcontext.gregs[30]; 96 *sp = ucontext->uc_mcontext.gregs[29]; 97#else 98# error "Unsupported arch" 99#endif 100} 101 102bool AsanInterceptsSignal(int signum) { 103 return signum == SIGSEGV && flags()->handle_segv; 104} 105 106void AsanPlatformThreadInit() { 107 // Nothing here for now. 108} 109 110#if !SANITIZER_ANDROID 111void ReadContextStack(void *context, uptr *stack, uptr *ssize) { 112 ucontext_t *ucp = (ucontext_t*)context; 113 *stack = (uptr)ucp->uc_stack.ss_sp; 114 *ssize = ucp->uc_stack.ss_size; 115} 116#else 117void ReadContextStack(void *context, uptr *stack, uptr *ssize) { 118 UNIMPLEMENTED(); 119} 120#endif 121 122} // namespace __asan 123 124#endif // SANITIZER_LINUX 125