forked from OSchip/llvm-project
236 lines
7.3 KiB
C++
236 lines
7.3 KiB
C++
//===-- sanitizer_mac.cc --------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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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 shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries and implements mac-specific functions from
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// sanitizer_libc.h.
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//===----------------------------------------------------------------------===//
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#ifdef __APPLE__
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#include "sanitizer_common.h"
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_libc.h"
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#include "sanitizer_procmaps.h"
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#include <crt_externs.h> // for _NSGetEnviron
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#include <fcntl.h>
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#include <mach-o/dyld.h>
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#include <mach-o/loader.h>
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#include <pthread.h>
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#include <sched.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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namespace __sanitizer {
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// ---------------------- sanitizer_libc.h
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void *internal_mmap(void *addr, size_t length, int prot, int flags,
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int fd, u64 offset) {
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return mmap(addr, length, prot, flags, fd, offset);
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}
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int internal_munmap(void *addr, uptr length) {
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return munmap(addr, length);
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}
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int internal_close(fd_t fd) {
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return close(fd);
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}
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fd_t internal_open(const char *filename, bool write) {
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return open(filename,
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write ? O_WRONLY | O_CREAT : O_RDONLY, 0660);
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}
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uptr internal_read(fd_t fd, void *buf, uptr count) {
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return read(fd, buf, count);
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}
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uptr internal_write(fd_t fd, const void *buf, uptr count) {
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return write(fd, buf, count);
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}
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uptr internal_filesize(fd_t fd) {
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struct stat st;
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if (fstat(fd, &st))
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return -1;
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return (uptr)st.st_size;
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}
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int internal_dup2(int oldfd, int newfd) {
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return dup2(oldfd, newfd);
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}
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uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
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return readlink(path, buf, bufsize);
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}
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int internal_sched_yield() {
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return sched_yield();
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}
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// ----------------- sanitizer_common.h
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void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
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uptr *stack_bottom) {
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CHECK(stack_top);
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CHECK(stack_bottom);
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uptr stacksize = pthread_get_stacksize_np(pthread_self());
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void *stackaddr = pthread_get_stackaddr_np(pthread_self());
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*stack_top = (uptr)stackaddr;
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*stack_bottom = *stack_top - stacksize;
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}
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const char *GetEnv(const char *name) {
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char ***env_ptr = _NSGetEnviron();
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CHECK(env_ptr);
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char **environ = *env_ptr;
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CHECK(environ);
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uptr name_len = internal_strlen(name);
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while (*environ != 0) {
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uptr len = internal_strlen(*environ);
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if (len > name_len) {
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const char *p = *environ;
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if (!internal_memcmp(p, name, name_len) &&
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p[name_len] == '=') { // Match.
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return *environ + name_len + 1; // String starting after =.
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}
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}
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environ++;
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}
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return 0;
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}
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// ----------------- sanitizer_procmaps.h
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MemoryMappingLayout::MemoryMappingLayout() {
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Reset();
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}
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MemoryMappingLayout::~MemoryMappingLayout() {
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}
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// More information about Mach-O headers can be found in mach-o/loader.h
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// Each Mach-O image has a header (mach_header or mach_header_64) starting with
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// a magic number, and a list of linker load commands directly following the
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// header.
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// A load command is at least two 32-bit words: the command type and the
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// command size in bytes. We're interested only in segment load commands
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// (LC_SEGMENT and LC_SEGMENT_64), which tell that a part of the file is mapped
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// into the task's address space.
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// The |vmaddr|, |vmsize| and |fileoff| fields of segment_command or
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// segment_command_64 correspond to the memory address, memory size and the
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// file offset of the current memory segment.
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// Because these fields are taken from the images as is, one needs to add
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// _dyld_get_image_vmaddr_slide() to get the actual addresses at runtime.
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void MemoryMappingLayout::Reset() {
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// Count down from the top.
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// TODO(glider): as per man 3 dyld, iterating over the headers with
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// _dyld_image_count is thread-unsafe. We need to register callbacks for
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// adding and removing images which will invalidate the MemoryMappingLayout
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// state.
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current_image_ = _dyld_image_count();
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current_load_cmd_count_ = -1;
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current_load_cmd_addr_ = 0;
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current_magic_ = 0;
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}
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// Next and NextSegmentLoad were inspired by base/sysinfo.cc in
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// Google Perftools, http://code.google.com/p/google-perftools.
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// NextSegmentLoad scans the current image for the next segment load command
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// and returns the start and end addresses and file offset of the corresponding
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// segment.
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// Note that the segment addresses are not necessarily sorted.
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template<u32 kLCSegment, typename SegmentCommand>
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bool MemoryMappingLayout::NextSegmentLoad(
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uptr *start, uptr *end, uptr *offset,
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char filename[], uptr filename_size) {
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const char* lc = current_load_cmd_addr_;
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current_load_cmd_addr_ += ((const load_command *)lc)->cmdsize;
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if (((const load_command *)lc)->cmd == kLCSegment) {
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const sptr dlloff = _dyld_get_image_vmaddr_slide(current_image_);
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const SegmentCommand* sc = (const SegmentCommand *)lc;
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if (start) *start = sc->vmaddr + dlloff;
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if (end) *end = sc->vmaddr + sc->vmsize + dlloff;
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if (offset) *offset = sc->fileoff;
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if (filename) {
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internal_strncpy(filename, _dyld_get_image_name(current_image_),
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filename_size);
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}
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return true;
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}
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return false;
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}
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bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
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char filename[], uptr filename_size) {
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for (; current_image_ >= 0; current_image_--) {
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const mach_header* hdr = _dyld_get_image_header(current_image_);
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if (!hdr) continue;
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if (current_load_cmd_count_ < 0) {
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// Set up for this image;
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current_load_cmd_count_ = hdr->ncmds;
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current_magic_ = hdr->magic;
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switch (current_magic_) {
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#ifdef MH_MAGIC_64
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case MH_MAGIC_64: {
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current_load_cmd_addr_ = (char*)hdr + sizeof(mach_header_64);
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break;
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}
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#endif
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case MH_MAGIC: {
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current_load_cmd_addr_ = (char*)hdr + sizeof(mach_header);
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break;
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}
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default: {
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continue;
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}
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}
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}
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for (; current_load_cmd_count_ >= 0; current_load_cmd_count_--) {
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switch (current_magic_) {
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// current_magic_ may be only one of MH_MAGIC, MH_MAGIC_64.
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#ifdef MH_MAGIC_64
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case MH_MAGIC_64: {
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if (NextSegmentLoad<LC_SEGMENT_64, struct segment_command_64>(
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start, end, offset, filename, filename_size))
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return true;
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break;
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}
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#endif
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case MH_MAGIC: {
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if (NextSegmentLoad<LC_SEGMENT, struct segment_command>(
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start, end, offset, filename, filename_size))
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return true;
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break;
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}
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}
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}
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// If we get here, no more load_cmd's in this image talk about
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// segments. Go on to the next image.
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}
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return false;
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}
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bool MemoryMappingLayout::GetObjectNameAndOffset(uptr addr, uptr *offset,
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char filename[],
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uptr filename_size) {
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return IterateForObjectNameAndOffset(addr, offset, filename, filename_size);
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}
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} // namespace __sanitizer
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#endif // __APPLE__
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