1 /* Copyright (c) 2014-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #define _FILE_OFFSET_BITS 64
14 #include <sys/types.h>
18 #include <sys/mman.h> // PROT_*
24 #include <libunwind.h>
25 #include <libunwind-ptrace.h>
27 #include <xbt/dynar.h>
30 #include <xbt/mmalloc.h>
32 #include "src/mc/mc_unw.h"
33 #include "src/mc/mc_snapshot.h"
34 #include "src/mc/mc_ignore.h"
35 #include "src/mc/mc_smx.h"
37 #include "src/mc/Process.hpp"
38 #include "src/mc/AddressSpace.hpp"
39 #include "src/mc/ObjectInformation.hpp"
40 #include "src/mc/Variable.hpp"
42 using simgrid::mc::remote;
44 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_process, mc,
45 "MC process information");
52 #define SO_RE "\\.so[\\.0-9]*$"
53 #define VERSION_RE "-[\\.0-9-]*$"
55 // In lexicographic order (but this is currently not used in the code):
56 static const char *const filtered_libraries[] = {
86 static bool is_simgrid_lib(const char* libname)
88 return !strcmp(libname, "libsimgrid");
91 static bool is_filtered_lib(const char* libname)
93 for (const char* filtered_lib : filtered_libraries)
94 if (strcmp(libname, filtered_lib)==0)
99 struct s_mc_memory_map_re {
104 static char* get_lib_name(const char* pathname, struct s_mc_memory_map_re* res)
106 char* map_basename = xbt_basename(pathname);
109 if(regexec(&res->so_re, map_basename, 1, &match, 0)) {
114 char* libname = strndup(map_basename, match.rm_so);
116 map_basename = nullptr;
118 // Strip the version suffix:
119 if(libname && !regexec(&res->version_re, libname, 1, &match, 0)) {
120 char* temp = libname;
121 libname = strndup(temp, match.rm_so);
128 static ssize_t pread_whole(int fd, void *buf, size_t count, std::uint64_t offset)
130 char* buffer = (char*) buf;
131 ssize_t real_count = count;
133 ssize_t res = pread(fd, buffer, count, (std::int64_t) offset);
140 else if (errno != EINTR) {
141 perror("pread_whole");
148 static ssize_t pwrite_whole(int fd, const void *buf, size_t count, off_t offset)
150 const char* buffer = (const char*) buf;
151 ssize_t real_count = count;
153 ssize_t res = pwrite(fd, buffer, count, offset);
160 else if (errno != EINTR)
166 static pthread_once_t zero_buffer_flag = PTHREAD_ONCE_INIT;
167 static const void* zero_buffer;
168 static const size_t zero_buffer_size = 10 * 4096;
170 static void zero_buffer_init(void)
172 int fd = open("/dev/zero", O_RDONLY);
174 xbt_die("Could not open /dev/zero");
175 zero_buffer = mmap(nullptr, zero_buffer_size, PROT_READ, MAP_SHARED, fd, 0);
176 if (zero_buffer == MAP_FAILED)
177 xbt_die("Could not map the zero buffer");
182 int open_process_file(pid_t pid, const char* file, int flags)
185 snprintf(buff, sizeof(buff), "/proc/%li/%s", (long) pid, file);
186 return open(buff, flags);
189 int open_vm(pid_t pid, int flags)
191 const size_t buffer_size = 30;
192 char buffer[buffer_size];
193 int res = snprintf(buffer, buffer_size, "/proc/%lli/mem", (long long) pid);
194 if (res < 0 || (size_t) res >= buffer_size) {
195 errno = ENAMETOOLONG;
198 return open(buffer, flags);
203 Process::Process(pid_t pid, int sockfd) :
204 AddressSpace(this), pid_(pid), channel_(sockfd), running_(true)
209 this->memory_map_ = simgrid::xbt::get_memory_map(this->pid_);
210 this->init_memory_map_info();
212 int fd = open_vm(this->pid_, O_RDWR);
214 xbt_die("Could not open file for process virtual address space");
215 this->memory_file = fd;
217 // Read std_heap (is a struct mdesc*):
218 simgrid::mc::Variable* std_heap_var = this->find_variable("__mmalloc_default_mdp");
220 xbt_die("No heap information in the target process");
221 if(!std_heap_var->address)
222 xbt_die("No constant address for this variable");
223 this->read_bytes(&this->heap_address, sizeof(struct mdesc*),
224 remote(std_heap_var->address),
225 simgrid::mc::ProcessIndexDisabled);
227 this->smx_process_infos.clear();
228 this->smx_old_process_infos.clear();
229 this->unw_addr_space = unw_create_addr_space(&mc_unw_accessors , __BYTE_ORDER);
230 this->unw_underlying_addr_space = simgrid::unw::create_addr_space();
231 this->unw_underlying_context = simgrid::unw::create_context(
232 this->unw_underlying_addr_space, this->pid_);
237 if (this->memory_file >= 0)
238 close(this->memory_file);
240 if (this->unw_underlying_addr_space != unw_local_addr_space) {
241 unw_destroy_addr_space(this->unw_underlying_addr_space);
242 _UPT_destroy(this->unw_underlying_context);
245 unw_destroy_addr_space(this->unw_addr_space);
247 if (this->clear_refs_fd_ >= 0)
248 close(this->clear_refs_fd_);
249 if (this->pagemap_fd_ >= 0)
250 close(this->pagemap_fd_);
253 /** Refresh the information about the process
255 * Do not use direclty, this is used by the getters when appropriate
256 * in order to have fresh data.
258 void Process::refresh_heap()
260 xbt_assert(mc_mode == MC_MODE_SERVER);
261 // Read/dereference/refresh the std_heap pointer:
263 this->heap = std::unique_ptr<s_xbt_mheap_t>(new s_xbt_mheap_t());
264 this->read_bytes(this->heap.get(), sizeof(struct mdesc),
265 remote(this->heap_address), simgrid::mc::ProcessIndexDisabled);
266 this->cache_flags_ |= Process::cache_heap;
269 /** Refresh the information about the process
271 * Do not use direclty, this is used by the getters when appropriate
272 * in order to have fresh data.
274 void Process::refresh_malloc_info()
276 xbt_assert(mc_mode == MC_MODE_SERVER);
277 // Refresh process->heapinfo:
278 if (this->cache_flags_ & Process::cache_malloc)
280 size_t count = this->heap->heaplimit + 1;
281 if (this->heap_info.size() < count)
282 this->heap_info.resize(count);
283 this->read_bytes(this->heap_info.data(), count * sizeof(malloc_info),
284 remote(this->heap->heapinfo), simgrid::mc::ProcessIndexDisabled);
285 this->cache_flags_ |= Process::cache_malloc;
288 /** @brief Finds the range of the different memory segments and binary paths */
289 void Process::init_memory_map_info()
291 XBT_DEBUG("Get debug information ...");
292 this->maestro_stack_start_ = nullptr;
293 this->maestro_stack_end_ = nullptr;
294 this->object_infos.resize(0);
295 this->binary_info = nullptr;
296 this->libsimgrid_info = nullptr;
298 struct s_mc_memory_map_re res;
300 if(regcomp(&res.so_re, SO_RE, 0) || regcomp(&res.version_re, VERSION_RE, 0))
301 xbt_die(".so regexp did not compile");
303 std::vector<simgrid::xbt::VmMap> const& maps = this->memory_map_;
305 const char* current_name = nullptr;
307 this->object_infos.clear();
309 for (size_t i=0; i < maps.size(); i++) {
310 simgrid::xbt::VmMap const& reg = maps[i];
311 const char* pathname = maps[i].pathname.c_str();
314 if (maps[i].pathname.empty()) {
315 current_name = nullptr;
319 // [stack], [vvar], [vsyscall], [vdso] ...
320 if (pathname[0] == '[') {
321 if ((reg.prot & PROT_WRITE) && !memcmp(pathname, "[stack]", 7)) {
322 this->maestro_stack_start_ = remote(reg.start_addr);
323 this->maestro_stack_end_ = remote(reg.end_addr);
325 current_name = nullptr;
329 if (current_name && strcmp(current_name, pathname)==0)
332 current_name = pathname;
333 if (!(reg.prot & PROT_READ) && (reg.prot & PROT_EXEC))
336 const bool is_executable = !i;
337 char* libname = nullptr;
338 if (!is_executable) {
339 libname = get_lib_name(pathname, &res);
342 if (is_filtered_lib(libname)) {
348 std::shared_ptr<simgrid::mc::ObjectInformation> info =
349 simgrid::mc::createObjectInformation(this->memory_map_, pathname);
350 this->object_infos.push_back(info);
352 this->binary_info = info;
353 else if (libname && is_simgrid_lib(libname))
354 this->libsimgrid_info = info;
359 regfree(&res.version_re);
361 // Resolve time (including accross differents objects):
362 for (auto const& object_info : this->object_infos)
363 postProcessObjectInformation(this, object_info.get());
365 xbt_assert(this->maestro_stack_start_, "Did not find maestro_stack_start");
366 xbt_assert(this->maestro_stack_end_, "Did not find maestro_stack_end");
368 XBT_DEBUG("Get debug information done !");
371 std::shared_ptr<simgrid::mc::ObjectInformation> Process::find_object_info(RemotePtr<void> addr) const
373 for (auto const& object_info : this->object_infos)
374 if (addr.address() >= (std::uint64_t)object_info->start
375 && addr.address() <= (std::uint64_t)object_info->end)
380 std::shared_ptr<ObjectInformation> Process::find_object_info_exec(RemotePtr<void> addr) const
382 for (std::shared_ptr<ObjectInformation> const& info : this->object_infos)
383 if (addr.address() >= (std::uint64_t) info->start_exec
384 && addr.address() <= (std::uint64_t) info->end_exec)
389 std::shared_ptr<ObjectInformation> Process::find_object_info_rw(RemotePtr<void> addr) const
391 for (std::shared_ptr<ObjectInformation> const& info : this->object_infos)
392 if (addr.address() >= (std::uint64_t)info->start_rw
393 && addr.address() <= (std::uint64_t)info->end_rw)
398 simgrid::mc::Frame* Process::find_function(RemotePtr<void> ip) const
400 std::shared_ptr<simgrid::mc::ObjectInformation> info = this->find_object_info_exec(ip);
401 return info ? info->find_function((void*) ip.address()) : nullptr;
404 /** Find (one occurence of) the named variable definition
406 simgrid::mc::Variable* Process::find_variable(const char* name) const
408 // First lookup the variable in the executable shared object.
409 // A global variable used directly by the executable code from a library
410 // is reinstanciated in the executable memory .data/.bss.
411 // We need to look up the variable in the execvutable first.
412 if (this->binary_info) {
413 std::shared_ptr<simgrid::mc::ObjectInformation> const& info = this->binary_info;
414 simgrid::mc::Variable* var = info->find_variable(name);
419 for (std::shared_ptr<simgrid::mc::ObjectInformation> const& info : this->object_infos) {
420 simgrid::mc::Variable* var = info->find_variable(name);
428 void Process::read_variable(const char* name, void* target, size_t size) const
430 simgrid::mc::Variable* var = this->find_variable(name);
432 xbt_die("No simple location for this variable");
433 if (!var->type->full_type)
434 xbt_die("Partial type for %s, cannot check size", name);
435 if ((size_t) var->type->full_type->byte_size != size)
436 xbt_die("Unexpected size for %s (expected %zi, was %zi)",
437 name, size, (size_t) var->type->full_type->byte_size);
438 this->read_bytes(target, size, remote(var->address));
441 char* Process::read_string(RemotePtr<void> address) const
447 char* res = (char*) malloc(len);
451 ssize_t c = pread(this->memory_file, res + off, len - off, (off_t) address.address() + off);
456 xbt_die("Could not read from from remote process");
459 xbt_die("Could not read string from remote process");
461 void* p = memchr(res + off, '\0', c);
468 res = (char*) realloc(res, len);
473 const void *Process::read_bytes(void* buffer, std::size_t size,
474 RemotePtr<void> address, int process_index,
475 ReadOptions options) const
477 if (process_index != simgrid::mc::ProcessIndexDisabled) {
478 std::shared_ptr<simgrid::mc::ObjectInformation> const& info =
479 this->find_object_info_rw((void*)address.address());
480 // Segment overlap is not handled.
482 if (info.get() && this->privatized(*info)) {
483 if (process_index < 0)
484 xbt_die("Missing process index");
485 if (process_index >= (int) MC_smpi_process_count())
486 xbt_die("Invalid process index");
488 // Read smpi_privatisation_regions from MCed:
489 smpi_privatisation_region_t remote_smpi_privatisation_regions =
490 mc_model_checker->process().read_variable<smpi_privatisation_region_t>(
491 "smpi_privatisation_regions");
493 s_smpi_privatisation_region_t privatisation_region =
494 mc_model_checker->process().read<s_smpi_privatisation_region_t>(
495 remote(remote_smpi_privatisation_regions + process_index));
497 // Address translation in the privaization segment:
498 size_t offset = address.address() - (std::uint64_t)info->start_rw;
499 address = remote((char*)privatisation_region.address + offset);
504 if (pread_whole(this->memory_file, buffer, size, address.address()) < 0)
505 xbt_die("Read from process %lli failed", (long long) this->pid_);
509 /** Write data to a process memory
511 * @param process the process
512 * @param local local memory address (source)
513 * @param remote target process memory address (target)
514 * @param len data size
516 void Process::write_bytes(const void* buffer, size_t len, RemotePtr<void> address)
518 if (pwrite_whole(this->memory_file, buffer, len, address.address()) < 0)
519 xbt_die("Write to process %lli failed", (long long) this->pid_);
522 void Process::clear_bytes(RemotePtr<void> address, size_t len)
524 pthread_once(&zero_buffer_flag, zero_buffer_init);
526 size_t s = len > zero_buffer_size ? zero_buffer_size : len;
527 this->write_bytes(zero_buffer, s, address);
528 address = remote((char*) address.address() + s);
533 void Process::ignore_region(std::uint64_t addr, std::size_t size)
535 IgnoredRegion region;
539 if (ignored_regions_.empty()) {
540 ignored_regions_.push_back(region);
544 unsigned int cursor = 0;
545 IgnoredRegion* current_region = nullptr;
548 int end = ignored_regions_.size() - 1;
549 while (start <= end) {
550 cursor = (start + end) / 2;
551 current_region = &ignored_regions_[cursor];
552 if (current_region->addr == addr) {
553 if (current_region->size == size)
555 else if (current_region->size < size)
559 } else if (current_region->addr < addr)
565 std::size_t position;
566 if (current_region->addr == addr) {
567 if (current_region->size < size)
568 position = cursor + 1;
571 } else if (current_region->addr < addr)
572 position = cursor + 1;
575 ignored_regions_.insert(
576 ignored_regions_.begin() + position, region);
579 void Process::reset_soft_dirty()
581 if (this->clear_refs_fd_ < 0) {
582 this->clear_refs_fd_ = open_process_file(pid_, "clear_refs", O_WRONLY|O_CLOEXEC);
583 if (this->clear_refs_fd_ < 0)
584 xbt_die("Could not open clear_refs file for soft-dirty tracking. Run as root?");
586 if(::write(this->clear_refs_fd_, "4\n", 2) != 2)
587 xbt_die("Could not reset softdirty bits");
590 void Process::read_pagemap(uint64_t* pagemap, size_t page_start, size_t page_count)
592 if (pagemap_fd_ < 0) {
593 pagemap_fd_ = open_process_file(pid_, "pagemap", O_RDONLY|O_CLOEXEC);
595 xbt_die("Could not open pagemap file for soft-dirty tracking. Run as root?");
597 ssize_t bytesize = sizeof(uint64_t) * page_count;
598 off_t offset = sizeof(uint64_t) * page_start;
599 if (pread_whole(pagemap_fd_, pagemap, bytesize, offset) != bytesize)
600 xbt_die("Could not read pagemap");
603 void Process::ignore_heap(IgnoredHeapRegion const& region)
605 if (ignored_heap_.empty()) {
606 ignored_heap_.push_back(std::move(region));
610 typedef std::vector<IgnoredHeapRegion>::size_type size_type;
613 size_type end = ignored_heap_.size() - 1;
615 // Binary search the position of insertion:
617 while (start <= end) {
618 cursor = start + (end - start) / 2;
619 auto& current_region = ignored_heap_[cursor];
620 if (current_region.address == region.address)
622 else if (current_region.address < region.address)
624 else if (cursor != 0)
631 // Insert it mc_heap_ignore_region_t:
632 if (ignored_heap_[cursor].address < region.address)
634 ignored_heap_.insert( ignored_heap_.begin() + cursor, region);
637 void Process::unignore_heap(void *address, size_t size)
639 typedef std::vector<IgnoredHeapRegion>::size_type size_type;
642 size_type end = ignored_heap_.size() - 1;
646 while (start <= end) {
647 cursor = (start + end) / 2;
648 auto& region = ignored_heap_[cursor];
649 if (region.address == address) {
650 ignored_heap_.erase(ignored_heap_.begin() + cursor);
652 } else if (region.address < address)
654 else if ((char *) region.address <= ((char *) address + size)) {
655 ignored_heap_.erase(ignored_heap_.begin() + cursor);
657 } else if (cursor != 0)
665 void Process::ignore_local_variable(const char *var_name, const char *frame_name)
667 if (frame_name != nullptr && strcmp(frame_name, "*") == 0)
668 frame_name = nullptr;
669 for (std::shared_ptr<simgrid::mc::ObjectInformation> const& info :
671 info->remove_local_variable(var_name, frame_name);
674 std::vector<simgrid::mc::SimixProcessInformation>& Process::simix_processes()
676 xbt_assert(mc_mode != MC_MODE_CLIENT);
677 this->refresh_simix();
678 return smx_process_infos;
681 std::vector<simgrid::mc::SimixProcessInformation>& Process::old_simix_processes()
683 xbt_assert(mc_mode != MC_MODE_CLIENT);
684 this->refresh_simix();
685 return smx_old_process_infos;