+++ /dev/null
-/* Copyright (c) 2014-2015. The SimGrid Team.
- * All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#define _FILE_OFFSET_BITS 64
-
-#include <assert.h>
-#include <stddef.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <errno.h>
-
-#include <sys/types.h>
-#include <fcntl.h>
-#include <unistd.h>
-#include <regex.h>
-#include <sys/mman.h> // PROT_*
-
-#include <pthread.h>
-
-#include <libgen.h>
-
-#include <libunwind.h>
-#include <libunwind-ptrace.h>
-
-#include <xbt/mmalloc.h>
-
-#include "mc_process.h"
-#include "mc_object_info.h"
-#include "mc_unw.h"
-#include "mc_snapshot.h"
-#include "mc_ignore.h"
-#include "mc_smx.h"
-#include "mc_server.h"
-
-#include "mc/AddressSpace.hpp"
-#include "mc/ObjectInformation.hpp"
-#include "mc/Variable.hpp"
-
-using simgrid::mc::remote;
-
-extern "C" {
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_process, mc,
- "MC process information");
-
-// ***** Helper stuff
-
-#define SO_RE "\\.so[\\.0-9]*$"
-#define VERSION_RE "-[\\.0-9-]*$"
-
-static const char *const FILTERED_LIBS[] = {
- "ld",
- "libbz2",
- "libboost_chrono",
- "libboost_context",
- "libboost_system",
- "libboost_thread",
- "libc",
- "libc++",
- "libcdt",
- "libcgraph",
- "libdl",
- "libdw",
- "libelf",
- "libgcc_s",
- "liblua5.1",
- "liblzma",
- "libm",
- "libpthread",
- "librt",
- "libsigc",
- "libstdc++",
- "libunwind",
- "libunwind-x86_64",
- "libunwind-x86",
- "libunwind-ptrace",
- "libz"
-};
-
-static bool MC_is_simgrid_lib(const char* libname)
-{
- return !strcmp(libname, "libsimgrid");
-}
-
-static bool MC_is_filtered_lib(const char* libname)
-{
- for (const char* filtered_lib : FILTERED_LIBS)
- if (strcmp(libname, filtered_lib)==0)
- return true;
- return false;
-}
-
-struct s_mc_memory_map_re {
- regex_t so_re;
- regex_t version_re;
-};
-
-static char* MC_get_lib_name(const char* pathname, struct s_mc_memory_map_re* res)
-{
- const char* map_basename = basename((char*) pathname);
-
- regmatch_t match;
- if(regexec(&res->so_re, map_basename, 1, &match, 0))
- return NULL;
-
- char* libname = strndup(map_basename, match.rm_so);
-
- // Strip the version suffix:
- if(libname && !regexec(&res->version_re, libname, 1, &match, 0)) {
- char* temp = libname;
- libname = strndup(temp, match.rm_so);
- free(temp);
- }
-
- return libname;
-}
-
-static ssize_t pread_whole(int fd, void *buf, size_t count, std::uint64_t offset)
-{
- char* buffer = (char*) buf;
- ssize_t real_count = count;
- while (count) {
- ssize_t res = pread(fd, buffer, count, (std::int64_t) offset);
- if (res > 0) {
- count -= res;
- buffer += res;
- offset += res;
- } else if (res==0) {
- return -1;
- } else if (errno != EINTR) {
- perror("pread_whole");
- return -1;
- }
- }
- return real_count;
-}
-
-static ssize_t pwrite_whole(int fd, const void *buf, size_t count, off_t offset)
-{
- const char* buffer = (const char*) buf;
- ssize_t real_count = count;
- while (count) {
- ssize_t res = pwrite(fd, buffer, count, offset);
- if (res > 0) {
- count -= res;
- buffer += res;
- offset += res;
- } else if (res==0) {
- return -1;
- } else if (errno != EINTR) {
- return -1;
- }
- }
- return real_count;
-}
-
-static pthread_once_t zero_buffer_flag = PTHREAD_ONCE_INIT;
-static const void* zero_buffer;
-static const size_t zero_buffer_size = 10 * 4096;
-
-static void MC_zero_buffer_init(void)
-{
- int fd = open("/dev/zero", O_RDONLY);
- if (fd<0)
- xbt_die("Could not open /dev/zero");
- zero_buffer = mmap(NULL, zero_buffer_size, PROT_READ, MAP_SHARED, fd, 0);
- if (zero_buffer == MAP_FAILED)
- xbt_die("Could not map the zero buffer");
- close(fd);
-}
-
-static
-int open_process_file(pid_t pid, const char* file, int flags)
-{
- char buff[50];
- snprintf(buff, sizeof(buff), "/proc/%li/%s", (long) pid, file);
- return open(buff, flags);
-}
-
-}
-
-namespace simgrid {
-namespace mc {
-
-int open_vm(pid_t pid, int flags)
-{
- const size_t buffer_size = 30;
- char buffer[buffer_size];
- int res = snprintf(buffer, buffer_size, "/proc/%lli/mem", (long long) pid);
- if (res < 0 || (size_t) res >= buffer_size) {
- errno = ENAMETOOLONG;
- return -1;
- }
- return open(buffer, flags);
-}
-
-
-}
-}
-
-// ***** Process
-
-namespace simgrid {
-namespace mc {
-
-Process::Process(pid_t pid, int sockfd)
-{
- Process* process = this;
-
- process->process_flags = MC_PROCESS_NO_FLAG;
- process->socket_ = sockfd;
- process->pid_ = pid;
- if (pid==getpid())
- process->process_flags |= MC_PROCESS_SELF_FLAG;
- process->running_ = true;
- process->status_ = 0;
- process->memory_map_ = get_memory_map(pid);
- process->cache_flags = MC_PROCESS_CACHE_FLAG_NONE;
- process->heap = NULL;
- process->heap_info = NULL;
- process->init_memory_map_info();
- process->clear_refs_fd_ = -1;
- process->pagemap_fd_ = -1;
-
- // Open the memory file
- if (process->is_self())
- process->memory_file = -1;
- else {
- int fd = open_vm(process->pid_, O_RDWR);
- if (fd<0)
- xbt_die("Could not open file for process virtual address space");
- process->memory_file = fd;
- }
-
- // Read std_heap (is a struct mdesc*):
- simgrid::mc::Variable* std_heap_var = process->find_variable("__mmalloc_default_mdp");
- if (!std_heap_var)
- xbt_die("No heap information in the target process");
- if(!std_heap_var->address)
- xbt_die("No constant address for this variable");
- process->read_bytes(&process->heap_address, sizeof(struct mdesc*),
- remote(std_heap_var->address),
- simgrid::mc::ProcessIndexDisabled);
-
- process->smx_process_infos = MC_smx_process_info_list_new();
- process->smx_old_process_infos = MC_smx_process_info_list_new();
-
- process->unw_addr_space = unw_create_addr_space(&mc_unw_accessors , __BYTE_ORDER);
- if (process->process_flags & MC_PROCESS_SELF_FLAG) {
- process->unw_underlying_addr_space = unw_local_addr_space;
- process->unw_underlying_context = NULL;
- } else {
- process->unw_underlying_addr_space = unw_create_addr_space(&mc_unw_vmread_accessors, __BYTE_ORDER);
- process->unw_underlying_context = _UPT_create(pid);
- }
-}
-
-Process::~Process()
-{
- Process* process = this;
-
- if (this->socket_ >= 0 && close(this->socket_) < 0)
- xbt_die("Could not close communication socket");
-
- process->process_flags = MC_PROCESS_NO_FLAG;
- process->pid_ = 0;
-
- process->maestro_stack_start_ = nullptr;
- process->maestro_stack_end_ = nullptr;
-
- xbt_dynar_free(&process->smx_process_infos);
- xbt_dynar_free(&process->smx_old_process_infos);
-
- if (process->memory_file >= 0) {
- close(process->memory_file);
- }
-
- if (process->unw_underlying_addr_space != unw_local_addr_space) {
- unw_destroy_addr_space(process->unw_underlying_addr_space);
- _UPT_destroy(process->unw_underlying_context);
- }
- process->unw_underlying_context = NULL;
- process->unw_underlying_addr_space = NULL;
-
- unw_destroy_addr_space(process->unw_addr_space);
- process->unw_addr_space = NULL;
-
- process->cache_flags = MC_PROCESS_CACHE_FLAG_NONE;
-
- free(process->heap);
- process->heap = NULL;
-
- free(process->heap_info);
- process->heap_info = NULL;
-
- if (process->clear_refs_fd_ >= 0)
- close(process->clear_refs_fd_);
- if (process->pagemap_fd_ >= 0)
- close(process->pagemap_fd_);
-}
-
-/** Refresh the information about the process
- *
- * Do not use direclty, this is used by the getters when appropriate
- * in order to have fresh data.
- */
-void Process::refresh_heap()
-{
- xbt_assert(mc_mode == MC_MODE_SERVER);
- xbt_assert(!this->is_self());
- // Read/dereference/refresh the std_heap pointer:
- if (!this->heap) {
- this->heap = (struct mdesc*) malloc(sizeof(struct mdesc));
- }
- this->read_bytes(this->heap, sizeof(struct mdesc), remote(this->heap_address),
- simgrid::mc::ProcessIndexDisabled);
- this->cache_flags |= MC_PROCESS_CACHE_FLAG_HEAP;
-}
-
-/** Refresh the information about the process
- *
- * Do not use direclty, this is used by the getters when appropriate
- * in order to have fresh data.
- * */
-void Process::refresh_malloc_info()
-{
- xbt_assert(mc_mode == MC_MODE_SERVER);
- xbt_assert(!this->is_self());
- if (!(this->cache_flags & MC_PROCESS_CACHE_FLAG_HEAP))
- this->refresh_heap();
- // Refresh process->heapinfo:
- size_t malloc_info_bytesize =
- (this->heap->heaplimit + 1) * sizeof(malloc_info);
- this->heap_info = (malloc_info*) realloc(this->heap_info, malloc_info_bytesize);
- this->read_bytes(this->heap_info, malloc_info_bytesize,
- remote(this->heap->heapinfo), simgrid::mc::ProcessIndexDisabled);
- this->cache_flags |= MC_PROCESS_CACHE_FLAG_MALLOC_INFO;
-}
-
-/** @brief Finds the range of the different memory segments and binary paths */
-void Process::init_memory_map_info()
-{
- XBT_DEBUG("Get debug information ...");
- this->maestro_stack_start_ = nullptr;
- this->maestro_stack_end_ = nullptr;
- this->object_infos.resize(0);
- this->binary_info = NULL;
- this->libsimgrid_info = NULL;
-
- struct s_mc_memory_map_re res;
-
- if(regcomp(&res.so_re, SO_RE, 0) || regcomp(&res.version_re, VERSION_RE, 0))
- xbt_die(".so regexp did not compile");
-
- std::vector<simgrid::mc::VmMap> const& maps = this->memory_map_;
-
- const char* current_name = NULL;
-
- this->object_infos.resize(0);
-
- for (size_t i=0; i < maps.size(); i++) {
- simgrid::mc::VmMap const& reg = maps[i];
- const char* pathname = maps[i].pathname.c_str();
-
- // Nothing to do
- if (maps[i].pathname.empty()) {
- current_name = NULL;
- continue;
- }
-
- // [stack], [vvar], [vsyscall], [vdso] ...
- if (pathname[0] == '[') {
- if ((reg.prot & PROT_WRITE) && !memcmp(pathname, "[stack]", 7)) {
- this->maestro_stack_start_ = remote(reg.start_addr);
- this->maestro_stack_end_ = remote(reg.end_addr);
- }
- current_name = NULL;
- continue;
- }
-
- if (current_name && strcmp(current_name, pathname)==0)
- continue;
-
- current_name = pathname;
- if (!(reg.prot & PROT_READ) && (reg.prot & PROT_EXEC))
- continue;
-
- const bool is_executable = !i;
- char* libname = NULL;
- if (!is_executable) {
- libname = MC_get_lib_name(pathname, &res);
- if(!libname)
- continue;
- if (MC_is_filtered_lib(libname)) {
- free(libname);
- continue;
- }
- }
-
- std::shared_ptr<simgrid::mc::ObjectInformation> info =
- MC_find_object_info(this->memory_map_, pathname, is_executable);
- this->object_infos.push_back(info);
- if (is_executable)
- this->binary_info = info;
- else if (libname && MC_is_simgrid_lib(libname))
- this->libsimgrid_info = info;
- free(libname);
- }
-
- regfree(&res.so_re);
- regfree(&res.version_re);
-
- // Resolve time (including accross differents objects):
- for (auto const& object_info : this->object_infos)
- MC_post_process_object_info(this, object_info.get());
-
- xbt_assert(this->maestro_stack_start_, "Did not find maestro_stack_start");
- xbt_assert(this->maestro_stack_end_, "Did not find maestro_stack_end");
-
- XBT_DEBUG("Get debug information done !");
-}
-
-std::shared_ptr<simgrid::mc::ObjectInformation> Process::find_object_info(remote_ptr<void> addr) const
-{
- for (auto const& object_info : this->object_infos) {
- if (addr.address() >= (std::uint64_t)object_info->start
- && addr.address() <= (std::uint64_t)object_info->end) {
- return object_info;
- }
- }
- return NULL;
-}
-
-std::shared_ptr<ObjectInformation> Process::find_object_info_exec(remote_ptr<void> addr) const
-{
- for (std::shared_ptr<ObjectInformation> const& info : this->object_infos) {
- if (addr.address() >= (std::uint64_t) info->start_exec
- && addr.address() <= (std::uint64_t) info->end_exec) {
- return info;
- }
- }
- return nullptr;
-}
-
-std::shared_ptr<ObjectInformation> Process::find_object_info_rw(remote_ptr<void> addr) const
-{
- for (std::shared_ptr<ObjectInformation> const& info : this->object_infos) {
- if (addr.address() >= (std::uint64_t)info->start_rw
- && addr.address() <= (std::uint64_t)info->end_rw) {
- return info;
- }
- }
- return nullptr;
-}
-
-simgrid::mc::Frame* Process::find_function(remote_ptr<void> ip) const
-{
- std::shared_ptr<simgrid::mc::ObjectInformation> info = this->find_object_info_exec(ip);
- return info ? info->find_function((void*) ip.address()) : nullptr;
-}
-
-/** Find (one occurence of) the named variable definition
- */
-simgrid::mc::Variable* Process::find_variable(const char* name) const
-{
- // First lookup the variable in the executable shared object.
- // A global variable used directly by the executable code from a library
- // is reinstanciated in the executable memory .data/.bss.
- // We need to look up the variable in the execvutable first.
- if (this->binary_info) {
- std::shared_ptr<simgrid::mc::ObjectInformation> const& info = this->binary_info;
- simgrid::mc::Variable* var = info->find_variable(name);
- if (var)
- return var;
- }
-
- for (std::shared_ptr<simgrid::mc::ObjectInformation> const& info : this->object_infos) {
- simgrid::mc::Variable* var = info->find_variable(name);
- if (var)
- return var;
- }
-
- return NULL;
-}
-
-void Process::read_variable(const char* name, void* target, size_t size) const
-{
- simgrid::mc::Variable* var = this->find_variable(name);
- if (!var->address)
- xbt_die("No simple location for this variable");
- if (!var->type->full_type)
- xbt_die("Partial type for %s, cannot check size", name);
- if ((size_t) var->type->full_type->byte_size != size)
- xbt_die("Unexpected size for %s (expected %zi, was %zi)",
- name, size, (size_t) var->type->full_type->byte_size);
- this->read_bytes(target, size, remote(var->address));
-}
-
-char* Process::read_string(remote_ptr<void> address) const
-{
- if (!address)
- return NULL;
- if (this->is_self())
- return xbt_strdup((char*) address.address());
-
- off_t len = 128;
- char* res = (char*) malloc(len);
- off_t off = 0;
-
- while (1) {
- ssize_t c = pread(this->memory_file, res + off, len - off, (off_t) address.address() + off);
- if (c == -1) {
- if (errno == EINTR)
- continue;
- else
- xbt_die("Could not read from from remote process");
- }
- if (c==0)
- xbt_die("Could not read string from remote process");
-
- void* p = memchr(res + off, '\0', c);
- if (p)
- return res;
-
- off += c;
- if (off == len) {
- len *= 2;
- res = (char*) realloc(res, len);
- }
- }
-}
-
-const void *Process::read_bytes(void* buffer, std::size_t size,
- remote_ptr<void> address, int process_index,
- AddressSpace::ReadMode mode) const
-{
- if (process_index != simgrid::mc::ProcessIndexDisabled) {
- std::shared_ptr<simgrid::mc::ObjectInformation> const& info =
- this->find_object_info_rw((void*)address.address());
- // Segment overlap is not handled.
-#ifdef HAVE_SMPI
- if (info.get() && info.get()->privatized()) {
- if (process_index < 0)
- xbt_die("Missing process index");
- if (process_index >= (int) MC_smpi_process_count())
- xbt_die("Invalid process index");
-
- // Read smpi_privatisation_regions from MCed:
- smpi_privatisation_region_t remote_smpi_privatisation_regions =
- mc_model_checker->process().read_variable<smpi_privatisation_region_t>(
- "smpi_privatisation_regions");
-
- s_smpi_privatisation_region_t privatisation_region =
- mc_model_checker->process().read<s_smpi_privatisation_region_t>(
- remote(remote_smpi_privatisation_regions + process_index));
-
- // Address translation in the privaization segment:
- size_t offset = address.address() - (std::uint64_t)info->start_rw;
- address = remote((char*)privatisation_region.address + offset);
- }
-#endif
- }
-
- if (this->is_self()) {
- if (mode == simgrid::mc::AddressSpace::Lazy)
- return (void*)address.address();
- else {
- memcpy(buffer, (void*)address.address(), size);
- return buffer;
- }
- } else {
- if (pread_whole(this->memory_file, buffer, size, address.address()) < 0)
- xbt_die("Read from process %lli failed", (long long) this->pid_);
- return buffer;
- }
-}
-
-/** Write data to a process memory
- *
- * @param process the process
- * @param local local memory address (source)
- * @param remote target process memory address (target)
- * @param len data size
- */
-void Process::write_bytes(const void* buffer, size_t len, remote_ptr<void> address)
-{
- if (this->is_self()) {
- memcpy((void*)address.address(), buffer, len);
- } else {
- if (pwrite_whole(this->memory_file, buffer, len, address.address()) < 0)
- xbt_die("Write to process %lli failed", (long long) this->pid_);
- }
-}
-
-void Process::clear_bytes(remote_ptr<void> address, size_t len)
-{
- if (this->is_self()) {
- memset((void*)address.address(), 0, len);
- } else {
- pthread_once(&zero_buffer_flag, MC_zero_buffer_init);
- while (len) {
- size_t s = len > zero_buffer_size ? zero_buffer_size : len;
- this->write_bytes(zero_buffer, s, address);
- address = remote((char*) address.address() + s);
- len -= s;
- }
- }
-}
-
-void Process::ignore_region(std::uint64_t addr, std::size_t size)
-{
- IgnoredRegion region;
- region.addr = addr;
- region.size = size;
-
- if (ignored_regions_.empty()) {
- ignored_regions_.push_back(region);
- return;
- }
-
- unsigned int cursor = 0;
- IgnoredRegion* current_region = nullptr;
-
- int start = 0;
- int end = ignored_regions_.size() - 1;
- while (start <= end) {
- cursor = (start + end) / 2;
- current_region = &ignored_regions_[cursor];
- if (current_region->addr == addr) {
- if (current_region->size == size)
- return;
- else if (current_region->size < size)
- start = cursor + 1;
- else
- end = cursor - 1;
- } else if (current_region->addr < addr)
- start = cursor + 1;
- else
- end = cursor - 1;
- }
-
- std::size_t position;
- if (current_region->addr == addr) {
- if (current_region->size < size) {
- position = cursor + 1;
- } else {
- position = cursor;
- }
- } else if (current_region->addr < addr) {
- position = cursor + 1;
- } else {
- position = cursor;
- }
- ignored_regions_.insert(
- ignored_regions_.begin() + position, region);
-}
-
-void Process::reset_soft_dirty()
-{
- if (this->clear_refs_fd_ < 0) {
- this->clear_refs_fd_ = open_process_file(pid_, "clear_refs", O_WRONLY|O_CLOEXEC);
- if (this->clear_refs_fd_ < 0)
- xbt_die("Could not open clear_refs file for soft-dirty tracking. Run as root?");
- }
- if(::write(this->clear_refs_fd_, "4\n", 2) != 2)
- xbt_die("Could not reset softdirty bits");
-}
-
-void Process::read_pagemap(uint64_t* pagemap, size_t page_start, size_t page_count)
-{
- if (pagemap_fd_ < 0) {
- pagemap_fd_ = open_process_file(pid_, "pagemap", O_RDONLY|O_CLOEXEC);
- if (pagemap_fd_ < 0)
- xbt_die("Could not open pagemap file for soft-dirty tracking. Run as root?");
- }
- ssize_t bytesize = sizeof(uint64_t) * page_count;
- off_t offset = sizeof(uint64_t) * page_start;
- if (pread_whole(pagemap_fd_, pagemap, bytesize, offset) != bytesize)
- xbt_die("Could not read pagemap");
-}
-
-}
-}
