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 = unw_create_addr_space(&mc_unw_vmread_accessors, __BYTE_ORDER);
231 this->unw_underlying_context = _UPT_create(this->pid_);
236 if (this->memory_file >= 0)
237 close(this->memory_file);
239 if (this->unw_underlying_addr_space != unw_local_addr_space) {
240 unw_destroy_addr_space(this->unw_underlying_addr_space);
241 _UPT_destroy(this->unw_underlying_context);
244 unw_destroy_addr_space(this->unw_addr_space);
246 if (this->clear_refs_fd_ >= 0)
247 close(this->clear_refs_fd_);
248 if (this->pagemap_fd_ >= 0)
249 close(this->pagemap_fd_);
252 /** Refresh the information about the process
254 * Do not use direclty, this is used by the getters when appropriate
255 * in order to have fresh data.
257 void Process::refresh_heap()
259 xbt_assert(mc_mode == MC_MODE_SERVER);
260 // Read/dereference/refresh the std_heap pointer:
262 this->heap = std::unique_ptr<s_xbt_mheap_t>(new s_xbt_mheap_t());
263 this->read_bytes(this->heap.get(), sizeof(struct mdesc),
264 remote(this->heap_address), simgrid::mc::ProcessIndexDisabled);
265 this->cache_flags |= MC_PROCESS_CACHE_FLAG_HEAP;
268 /** Refresh the information about the process
270 * Do not use direclty, this is used by the getters when appropriate
271 * in order to have fresh data.
273 void Process::refresh_malloc_info()
275 xbt_assert(mc_mode == MC_MODE_SERVER);
276 if (!(this->cache_flags & MC_PROCESS_CACHE_FLAG_HEAP))
277 this->refresh_heap();
278 // Refresh process->heapinfo:
279 size_t count = this->heap->heaplimit + 1;
280 if (this->heap_info.size() < count)
281 this->heap_info.resize(count);
282 this->read_bytes(this->heap_info.data(), count * sizeof(malloc_info),
283 remote(this->heap->heapinfo), simgrid::mc::ProcessIndexDisabled);
284 this->cache_flags |= MC_PROCESS_CACHE_FLAG_MALLOC_INFO;
287 /** @brief Finds the range of the different memory segments and binary paths */
288 void Process::init_memory_map_info()
290 XBT_DEBUG("Get debug information ...");
291 this->maestro_stack_start_ = nullptr;
292 this->maestro_stack_end_ = nullptr;
293 this->object_infos.resize(0);
294 this->binary_info = nullptr;
295 this->libsimgrid_info = nullptr;
297 struct s_mc_memory_map_re res;
299 if(regcomp(&res.so_re, SO_RE, 0) || regcomp(&res.version_re, VERSION_RE, 0))
300 xbt_die(".so regexp did not compile");
302 std::vector<simgrid::xbt::VmMap> const& maps = this->memory_map_;
304 const char* current_name = nullptr;
306 this->object_infos.clear();
308 for (size_t i=0; i < maps.size(); i++) {
309 simgrid::xbt::VmMap const& reg = maps[i];
310 const char* pathname = maps[i].pathname.c_str();
313 if (maps[i].pathname.empty()) {
314 current_name = nullptr;
318 // [stack], [vvar], [vsyscall], [vdso] ...
319 if (pathname[0] == '[') {
320 if ((reg.prot & PROT_WRITE) && !memcmp(pathname, "[stack]", 7)) {
321 this->maestro_stack_start_ = remote(reg.start_addr);
322 this->maestro_stack_end_ = remote(reg.end_addr);
324 current_name = nullptr;
328 if (current_name && strcmp(current_name, pathname)==0)
331 current_name = pathname;
332 if (!(reg.prot & PROT_READ) && (reg.prot & PROT_EXEC))
335 const bool is_executable = !i;
336 char* libname = nullptr;
337 if (!is_executable) {
338 libname = get_lib_name(pathname, &res);
341 if (is_filtered_lib(libname)) {
347 std::shared_ptr<simgrid::mc::ObjectInformation> info =
348 simgrid::mc::createObjectInformation(this->memory_map_, pathname);
349 this->object_infos.push_back(info);
351 this->binary_info = info;
352 else if (libname && is_simgrid_lib(libname))
353 this->libsimgrid_info = info;
358 regfree(&res.version_re);
360 // Resolve time (including accross differents objects):
361 for (auto const& object_info : this->object_infos)
362 postProcessObjectInformation(this, object_info.get());
364 xbt_assert(this->maestro_stack_start_, "Did not find maestro_stack_start");
365 xbt_assert(this->maestro_stack_end_, "Did not find maestro_stack_end");
367 XBT_DEBUG("Get debug information done !");
370 std::shared_ptr<simgrid::mc::ObjectInformation> Process::find_object_info(RemotePtr<void> addr) const
372 for (auto const& object_info : this->object_infos)
373 if (addr.address() >= (std::uint64_t)object_info->start
374 && addr.address() <= (std::uint64_t)object_info->end)
379 std::shared_ptr<ObjectInformation> Process::find_object_info_exec(RemotePtr<void> addr) const
381 for (std::shared_ptr<ObjectInformation> const& info : this->object_infos)
382 if (addr.address() >= (std::uint64_t) info->start_exec
383 && addr.address() <= (std::uint64_t) info->end_exec)
388 std::shared_ptr<ObjectInformation> Process::find_object_info_rw(RemotePtr<void> addr) const
390 for (std::shared_ptr<ObjectInformation> const& info : this->object_infos)
391 if (addr.address() >= (std::uint64_t)info->start_rw
392 && addr.address() <= (std::uint64_t)info->end_rw)
397 simgrid::mc::Frame* Process::find_function(RemotePtr<void> ip) const
399 std::shared_ptr<simgrid::mc::ObjectInformation> info = this->find_object_info_exec(ip);
400 return info ? info->find_function((void*) ip.address()) : nullptr;
403 /** Find (one occurence of) the named variable definition
405 simgrid::mc::Variable* Process::find_variable(const char* name) const
407 // First lookup the variable in the executable shared object.
408 // A global variable used directly by the executable code from a library
409 // is reinstanciated in the executable memory .data/.bss.
410 // We need to look up the variable in the execvutable first.
411 if (this->binary_info) {
412 std::shared_ptr<simgrid::mc::ObjectInformation> const& info = this->binary_info;
413 simgrid::mc::Variable* var = info->find_variable(name);
418 for (std::shared_ptr<simgrid::mc::ObjectInformation> const& info : this->object_infos) {
419 simgrid::mc::Variable* var = info->find_variable(name);
427 void Process::read_variable(const char* name, void* target, size_t size) const
429 simgrid::mc::Variable* var = this->find_variable(name);
431 xbt_die("No simple location for this variable");
432 if (!var->type->full_type)
433 xbt_die("Partial type for %s, cannot check size", name);
434 if ((size_t) var->type->full_type->byte_size != size)
435 xbt_die("Unexpected size for %s (expected %zi, was %zi)",
436 name, size, (size_t) var->type->full_type->byte_size);
437 this->read_bytes(target, size, remote(var->address));
440 char* Process::read_string(RemotePtr<void> address) const
446 char* res = (char*) malloc(len);
450 ssize_t c = pread(this->memory_file, res + off, len - off, (off_t) address.address() + off);
455 xbt_die("Could not read from from remote process");
458 xbt_die("Could not read string from remote process");
460 void* p = memchr(res + off, '\0', c);
467 res = (char*) realloc(res, len);
472 const void *Process::read_bytes(void* buffer, std::size_t size,
473 RemotePtr<void> address, int process_index,
474 ReadOptions options) const
476 if (process_index != simgrid::mc::ProcessIndexDisabled) {
477 std::shared_ptr<simgrid::mc::ObjectInformation> const& info =
478 this->find_object_info_rw((void*)address.address());
479 // Segment overlap is not handled.
481 if (info.get() && this->privatized(*info)) {
482 if (process_index < 0)
483 xbt_die("Missing process index");
484 if (process_index >= (int) MC_smpi_process_count())
485 xbt_die("Invalid process index");
487 // Read smpi_privatisation_regions from MCed:
488 smpi_privatisation_region_t remote_smpi_privatisation_regions =
489 mc_model_checker->process().read_variable<smpi_privatisation_region_t>(
490 "smpi_privatisation_regions");
492 s_smpi_privatisation_region_t privatisation_region =
493 mc_model_checker->process().read<s_smpi_privatisation_region_t>(
494 remote(remote_smpi_privatisation_regions + process_index));
496 // Address translation in the privaization segment:
497 size_t offset = address.address() - (std::uint64_t)info->start_rw;
498 address = remote((char*)privatisation_region.address + offset);
503 if (pread_whole(this->memory_file, buffer, size, address.address()) < 0)
504 xbt_die("Read from process %lli failed", (long long) this->pid_);
508 /** Write data to a process memory
510 * @param process the process
511 * @param local local memory address (source)
512 * @param remote target process memory address (target)
513 * @param len data size
515 void Process::write_bytes(const void* buffer, size_t len, RemotePtr<void> address)
517 if (pwrite_whole(this->memory_file, buffer, len, address.address()) < 0)
518 xbt_die("Write to process %lli failed", (long long) this->pid_);
521 void Process::clear_bytes(RemotePtr<void> address, size_t len)
523 pthread_once(&zero_buffer_flag, zero_buffer_init);
525 size_t s = len > zero_buffer_size ? zero_buffer_size : len;
526 this->write_bytes(zero_buffer, s, address);
527 address = remote((char*) address.address() + s);
532 void Process::ignore_region(std::uint64_t addr, std::size_t size)
534 IgnoredRegion region;
538 if (ignored_regions_.empty()) {
539 ignored_regions_.push_back(region);
543 unsigned int cursor = 0;
544 IgnoredRegion* current_region = nullptr;
547 int end = ignored_regions_.size() - 1;
548 while (start <= end) {
549 cursor = (start + end) / 2;
550 current_region = &ignored_regions_[cursor];
551 if (current_region->addr == addr) {
552 if (current_region->size == size)
554 else if (current_region->size < size)
558 } else if (current_region->addr < addr)
564 std::size_t position;
565 if (current_region->addr == addr) {
566 if (current_region->size < size)
567 position = cursor + 1;
570 } else if (current_region->addr < addr)
571 position = cursor + 1;
574 ignored_regions_.insert(
575 ignored_regions_.begin() + position, region);
578 void Process::reset_soft_dirty()
580 if (this->clear_refs_fd_ < 0) {
581 this->clear_refs_fd_ = open_process_file(pid_, "clear_refs", O_WRONLY|O_CLOEXEC);
582 if (this->clear_refs_fd_ < 0)
583 xbt_die("Could not open clear_refs file for soft-dirty tracking. Run as root?");
585 if(::write(this->clear_refs_fd_, "4\n", 2) != 2)
586 xbt_die("Could not reset softdirty bits");
589 void Process::read_pagemap(uint64_t* pagemap, size_t page_start, size_t page_count)
591 if (pagemap_fd_ < 0) {
592 pagemap_fd_ = open_process_file(pid_, "pagemap", O_RDONLY|O_CLOEXEC);
594 xbt_die("Could not open pagemap file for soft-dirty tracking. Run as root?");
596 ssize_t bytesize = sizeof(uint64_t) * page_count;
597 off_t offset = sizeof(uint64_t) * page_start;
598 if (pread_whole(pagemap_fd_, pagemap, bytesize, offset) != bytesize)
599 xbt_die("Could not read pagemap");
602 void Process::ignore_heap(IgnoredHeapRegion const& region)
604 if (ignored_heap_.empty()) {
605 ignored_heap_.push_back(std::move(region));
609 typedef std::vector<IgnoredHeapRegion>::size_type size_type;
612 size_type end = ignored_heap_.size() - 1;
614 // Binary search the position of insertion:
616 while (start <= end) {
617 cursor = start + (end - start) / 2;
618 auto& current_region = ignored_heap_[cursor];
619 if (current_region.address == region.address)
621 else if (current_region.address < region.address)
623 else if (cursor != 0)
630 // Insert it mc_heap_ignore_region_t:
631 if (ignored_heap_[cursor].address < region.address)
633 ignored_heap_.insert( ignored_heap_.begin() + cursor, region);
636 void Process::unignore_heap(void *address, size_t size)
638 typedef std::vector<IgnoredHeapRegion>::size_type size_type;
641 size_type end = ignored_heap_.size() - 1;
645 while (start <= end) {
646 cursor = (start + end) / 2;
647 auto& region = ignored_heap_[cursor];
648 if (region.address == address) {
649 ignored_heap_.erase(ignored_heap_.begin() + cursor);
651 } else if (region.address < address)
653 else if ((char *) region.address <= ((char *) address + size)) {
654 ignored_heap_.erase(ignored_heap_.begin() + cursor);
656 } else if (cursor != 0)
664 void Process::ignore_local_variable(const char *var_name, const char *frame_name)
666 if (frame_name != nullptr && strcmp(frame_name, "*") == 0)
667 frame_name = nullptr;
668 for (std::shared_ptr<simgrid::mc::ObjectInformation> const& info :
670 info->remove_local_variable(var_name, frame_name);
673 std::vector<simgrid::mc::SimixProcessInformation>& Process::simix_processes()
675 xbt_assert(mc_mode != MC_MODE_CLIENT);
676 this->refresh_simix();
677 return smx_process_infos;
680 std::vector<simgrid::mc::SimixProcessInformation>& Process::old_simix_processes()
682 xbt_assert(mc_mode != MC_MODE_CLIENT);
683 this->refresh_simix();
684 return smx_old_process_infos;