129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
//===-- asan_linux.cc -----------------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// Linux-specific details.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_LINUX
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#include "asan_interceptors.h"
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#include "asan_internal.h"
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#include "asan_thread.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_procmaps.h"
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/mman.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <unwind.h>
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#if !SANITIZER_ANDROID
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// FIXME: where to get ucontext on Android?
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#include <sys/ucontext.h>
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#endif
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extern "C" void* _DYNAMIC;
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namespace __asan {
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void MaybeReexec() {
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// No need to re-exec on Linux.
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}
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void *AsanDoesNotSupportStaticLinkage() {
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// This will fail to link with -static.
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return &_DYNAMIC; // defined in link.h
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}
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void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
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#if SANITIZER_ANDROID
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*pc = *sp = *bp = 0;
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#elif defined(__arm__)
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ucontext_t *ucontext = (ucontext_t*)context;
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*pc = ucontext->uc_mcontext.arm_pc;
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*bp = ucontext->uc_mcontext.arm_fp;
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*sp = ucontext->uc_mcontext.arm_sp;
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# elif defined(__hppa__)
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ucontext_t *ucontext = (ucontext_t*)context;
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*pc = ucontext->uc_mcontext.sc_iaoq[0];
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/* GCC uses %r3 whenever a frame pointer is needed. */
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*bp = ucontext->uc_mcontext.sc_gr[3];
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*sp = ucontext->uc_mcontext.sc_gr[30];
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# elif defined(__x86_64__)
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ucontext_t *ucontext = (ucontext_t*)context;
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*pc = ucontext->uc_mcontext.gregs[REG_RIP];
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*bp = ucontext->uc_mcontext.gregs[REG_RBP];
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*sp = ucontext->uc_mcontext.gregs[REG_RSP];
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# elif defined(__i386__)
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ucontext_t *ucontext = (ucontext_t*)context;
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*pc = ucontext->uc_mcontext.gregs[REG_EIP];
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*bp = ucontext->uc_mcontext.gregs[REG_EBP];
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*sp = ucontext->uc_mcontext.gregs[REG_ESP];
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# elif defined(__powerpc__) || defined(__powerpc64__)
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ucontext_t *ucontext = (ucontext_t*)context;
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*pc = ucontext->uc_mcontext.regs->nip;
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*sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
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// The powerpc{,64}-linux ABIs do not specify r31 as the frame
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// pointer, but GCC always uses r31 when we need a frame pointer.
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*bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
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# elif defined(__sparc__)
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ucontext_t *ucontext = (ucontext_t*)context;
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uptr *stk_ptr;
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# if defined (__arch64__)
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*pc = ucontext->uc_mcontext.mc_gregs[MC_PC];
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*sp = ucontext->uc_mcontext.mc_gregs[MC_O6];
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stk_ptr = (uptr *) (*sp + 2047);
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*bp = stk_ptr[15];
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# else
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*pc = ucontext->uc_mcontext.gregs[REG_PC];
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*sp = ucontext->uc_mcontext.gregs[REG_O6];
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stk_ptr = (uptr *) *sp;
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*bp = stk_ptr[15];
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# endif
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# elif defined(__mips__)
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ucontext_t *ucontext = (ucontext_t*)context;
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*pc = ucontext->uc_mcontext.gregs[31];
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*bp = ucontext->uc_mcontext.gregs[30];
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*sp = ucontext->uc_mcontext.gregs[29];
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#else
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# error "Unsupported arch"
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#endif
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}
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bool AsanInterceptsSignal(int signum) {
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return signum == SIGSEGV && flags()->handle_segv;
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}
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void AsanPlatformThreadInit() {
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// Nothing here for now.
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}
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#if !SANITIZER_ANDROID
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void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
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ucontext_t *ucp = (ucontext_t*)context;
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*stack = (uptr)ucp->uc_stack.ss_sp;
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*ssize = ucp->uc_stack.ss_size;
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}
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#else
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void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
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UNIMPLEMENTED();
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}
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#endif
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} // namespace __asan
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#endif // SANITIZER_LINUX
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