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
15 #include <sys/types.h>
19 #include <sys/mman.h> // PROT_*
25 #include <libunwind.h>
26 #include <libunwind-ptrace.h>
28 #include <xbt/mmalloc.h>
30 #include "mc_process.h"
31 #include "mc_dwarf.hpp"
33 #include "mc_snapshot.h"
34 #include "mc_ignore.h"
36 #include "mc_server.h"
38 #include "mc/AddressSpace.hpp"
39 #include "mc/ObjectInformation.hpp"
40 #include "mc/Variable.hpp"
42 using simgrid::mc::remote;
46 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_process, mc,
47 "MC process information");
51 #define SO_RE "\\.so[\\.0-9]*$"
52 #define VERSION_RE "-[\\.0-9-]*$"
54 static const char *const FILTERED_LIBS[] = {
83 static bool MC_is_simgrid_lib(const char* libname)
85 return !strcmp(libname, "libsimgrid");
88 static bool MC_is_filtered_lib(const char* libname)
90 for (const char* filtered_lib : FILTERED_LIBS)
91 if (strcmp(libname, filtered_lib)==0)
96 struct s_mc_memory_map_re {
101 static char* MC_get_lib_name(const char* pathname, struct s_mc_memory_map_re* res)
103 const char* map_basename = basename((char*) pathname);
106 if(regexec(&res->so_re, map_basename, 1, &match, 0))
109 char* libname = strndup(map_basename, match.rm_so);
111 // Strip the version suffix:
112 if(libname && !regexec(&res->version_re, libname, 1, &match, 0)) {
113 char* temp = libname;
114 libname = strndup(temp, match.rm_so);
121 static ssize_t pread_whole(int fd, void *buf, size_t count, std::uint64_t offset)
123 char* buffer = (char*) buf;
124 ssize_t real_count = count;
126 ssize_t res = pread(fd, buffer, count, (std::int64_t) offset);
133 } else if (errno != EINTR) {
140 static ssize_t pwrite_whole(int fd, const void *buf, size_t count, off_t offset)
142 const char* buffer = (const char*) buf;
143 ssize_t real_count = count;
145 ssize_t res = pwrite(fd, buffer, count, offset);
152 } else if (errno != EINTR) {
159 static pthread_once_t zero_buffer_flag = PTHREAD_ONCE_INIT;
160 static const void* zero_buffer;
161 static const size_t zero_buffer_size = 10 * 4096;
163 static void MC_zero_buffer_init(void)
165 int fd = open("/dev/zero", O_RDONLY);
167 xbt_die("Could not open /dev/zero");
168 zero_buffer = mmap(NULL, zero_buffer_size, PROT_READ, MAP_SHARED, fd, 0);
169 if (zero_buffer == MAP_FAILED)
170 xbt_die("Could not map the zero buffer");
179 int open_vm(pid_t pid, int flags)
181 const size_t buffer_size = 30;
182 char buffer[buffer_size];
183 int res = snprintf(buffer, buffer_size, "/proc/%lli/mem", (long long) pid);
184 if (res < 0 || (size_t) res >= buffer_size) {
185 errno = ENAMETOOLONG;
188 return open(buffer, flags);
200 Process::Process(pid_t pid, int sockfd)
202 Process* process = this;
204 process->process_flags = MC_PROCESS_NO_FLAG;
205 process->socket_ = sockfd;
208 process->process_flags |= MC_PROCESS_SELF_FLAG;
209 process->running_ = true;
210 process->status_ = 0;
211 process->memory_map_ = get_memory_map(pid);
212 process->cache_flags = MC_PROCESS_CACHE_FLAG_NONE;
213 process->heap = NULL;
214 process->heap_info = NULL;
215 process->init_memory_map_info();
217 // Open the memory file
218 if (process->is_self())
219 process->memory_file = -1;
221 int fd = open_vm(process->pid_, O_RDWR);
223 xbt_die("Could not open file for process virtual address space");
224 process->memory_file = fd;
227 // Read std_heap (is a struct mdesc*):
228 simgrid::mc::Variable* std_heap_var = process->find_variable("__mmalloc_default_mdp");
230 xbt_die("No heap information in the target process");
231 if(!std_heap_var->address)
232 xbt_die("No constant address for this variable");
233 process->read_bytes(&process->heap_address, sizeof(struct mdesc*),
234 remote(std_heap_var->address),
235 simgrid::mc::ProcessIndexDisabled);
237 process->smx_process_infos = MC_smx_process_info_list_new();
238 process->smx_old_process_infos = MC_smx_process_info_list_new();
240 process->unw_addr_space = unw_create_addr_space(&mc_unw_accessors , __BYTE_ORDER);
241 if (process->process_flags & MC_PROCESS_SELF_FLAG) {
242 process->unw_underlying_addr_space = unw_local_addr_space;
243 process->unw_underlying_context = NULL;
245 process->unw_underlying_addr_space = unw_create_addr_space(&mc_unw_vmread_accessors, __BYTE_ORDER);
246 process->unw_underlying_context = _UPT_create(pid);
252 Process* process = this;
254 if (this->socket_ >= 0 && close(this->socket_) < 0)
255 xbt_die("Could not close communication socket");
257 process->process_flags = MC_PROCESS_NO_FLAG;
260 process->maestro_stack_start_ = nullptr;
261 process->maestro_stack_end_ = nullptr;
263 xbt_dynar_free(&process->smx_process_infos);
264 xbt_dynar_free(&process->smx_old_process_infos);
266 if (process->memory_file >= 0) {
267 close(process->memory_file);
270 if (process->unw_underlying_addr_space != unw_local_addr_space) {
271 unw_destroy_addr_space(process->unw_underlying_addr_space);
272 _UPT_destroy(process->unw_underlying_context);
274 process->unw_underlying_context = NULL;
275 process->unw_underlying_addr_space = NULL;
277 unw_destroy_addr_space(process->unw_addr_space);
278 process->unw_addr_space = NULL;
280 process->cache_flags = MC_PROCESS_CACHE_FLAG_NONE;
283 process->heap = NULL;
285 free(process->heap_info);
286 process->heap_info = NULL;
289 /** Refresh the information about the process
291 * Do not use direclty, this is used by the getters when appropriate
292 * in order to have fresh data.
294 void Process::refresh_heap()
296 xbt_assert(mc_mode == MC_MODE_SERVER);
297 xbt_assert(!this->is_self());
298 // Read/dereference/refresh the std_heap pointer:
300 this->heap = (struct mdesc*) malloc(sizeof(struct mdesc));
302 this->read_bytes(this->heap, sizeof(struct mdesc), remote(this->heap_address),
303 simgrid::mc::ProcessIndexDisabled);
304 this->cache_flags |= MC_PROCESS_CACHE_FLAG_HEAP;
307 /** Refresh the information about the process
309 * Do not use direclty, this is used by the getters when appropriate
310 * in order to have fresh data.
312 void Process::refresh_malloc_info()
314 xbt_assert(mc_mode == MC_MODE_SERVER);
315 xbt_assert(!this->is_self());
316 if (!(this->cache_flags & MC_PROCESS_CACHE_FLAG_HEAP))
317 this->refresh_heap();
318 // Refresh process->heapinfo:
319 size_t malloc_info_bytesize =
320 (this->heap->heaplimit + 1) * sizeof(malloc_info);
321 this->heap_info = (malloc_info*) realloc(this->heap_info, malloc_info_bytesize);
322 this->read_bytes(this->heap_info, malloc_info_bytesize,
323 remote(this->heap->heapinfo), simgrid::mc::ProcessIndexDisabled);
324 this->cache_flags |= MC_PROCESS_CACHE_FLAG_MALLOC_INFO;
327 /** @brief Finds the range of the different memory segments and binary paths */
328 void Process::init_memory_map_info()
330 XBT_DEBUG("Get debug information ...");
331 this->maestro_stack_start_ = nullptr;
332 this->maestro_stack_end_ = nullptr;
333 this->object_infos.resize(0);
334 this->binary_info = NULL;
335 this->libsimgrid_info = NULL;
337 struct s_mc_memory_map_re res;
339 if(regcomp(&res.so_re, SO_RE, 0) || regcomp(&res.version_re, VERSION_RE, 0))
340 xbt_die(".so regexp did not compile");
342 std::vector<simgrid::mc::VmMap> const& maps = this->memory_map_;
344 const char* current_name = NULL;
346 this->object_infos.resize(0);
348 for (size_t i=0; i < maps.size(); i++) {
349 simgrid::mc::VmMap const& reg = maps[i];
350 const char* pathname = maps[i].pathname.c_str();
353 if (maps[i].pathname.empty()) {
358 // [stack], [vvar], [vsyscall], [vdso] ...
359 if (pathname[0] == '[') {
360 if ((reg.prot & PROT_WRITE) && !memcmp(pathname, "[stack]", 7)) {
361 this->maestro_stack_start_ = remote(reg.start_addr);
362 this->maestro_stack_end_ = remote(reg.end_addr);
368 if (current_name && strcmp(current_name, pathname)==0)
371 current_name = pathname;
372 if (!(reg.prot & PROT_READ) && (reg.prot & PROT_EXEC))
375 const bool is_executable = !i;
376 char* libname = NULL;
377 if (!is_executable) {
378 libname = MC_get_lib_name(pathname, &res);
381 if (MC_is_filtered_lib(libname)) {
387 std::shared_ptr<simgrid::mc::ObjectInformation> info =
388 MC_find_object_info(this->memory_map_, pathname, is_executable);
389 this->object_infos.push_back(info);
391 this->binary_info = info;
392 else if (libname && MC_is_simgrid_lib(libname))
393 this->libsimgrid_info = info;
398 regfree(&res.version_re);
400 // Resolve time (including accross differents objects):
401 for (auto const& object_info : this->object_infos)
402 MC_post_process_object_info(this, object_info.get());
404 xbt_assert(this->maestro_stack_start_, "Did not find maestro_stack_start");
405 xbt_assert(this->maestro_stack_end_, "Did not find maestro_stack_end");
407 XBT_DEBUG("Get debug information done !");
410 std::shared_ptr<simgrid::mc::ObjectInformation> Process::find_object_info(remote_ptr<void> addr) const
412 for (auto const& object_info : this->object_infos) {
413 if (addr.address() >= (std::uint64_t)object_info->start
414 && addr.address() <= (std::uint64_t)object_info->end) {
421 std::shared_ptr<ObjectInformation> Process::find_object_info_exec(remote_ptr<void> addr) const
423 for (std::shared_ptr<ObjectInformation> const& info : this->object_infos) {
424 if (addr.address() >= (std::uint64_t) info->start_exec
425 && addr.address() <= (std::uint64_t) info->end_exec) {
432 std::shared_ptr<ObjectInformation> Process::find_object_info_rw(remote_ptr<void> addr) const
434 for (std::shared_ptr<ObjectInformation> const& info : this->object_infos) {
435 if (addr.address() >= (std::uint64_t)info->start_rw
436 && addr.address() <= (std::uint64_t)info->end_rw) {
443 simgrid::mc::Frame* Process::find_function(remote_ptr<void> ip) const
445 std::shared_ptr<simgrid::mc::ObjectInformation> info = this->find_object_info_exec(ip);
446 return info ? info->find_function((void*) ip.address()) : nullptr;
449 /** Find (one occurence of) the named variable definition
451 simgrid::mc::Variable* Process::find_variable(const char* name) const
453 // First lookup the variable in the executable shared object.
454 // A global variable used directly by the executable code from a library
455 // is reinstanciated in the executable memory .data/.bss.
456 // We need to look up the variable in the execvutable first.
457 if (this->binary_info) {
458 std::shared_ptr<simgrid::mc::ObjectInformation> const& info = this->binary_info;
459 simgrid::mc::Variable* var = info->find_variable(name);
464 for (std::shared_ptr<simgrid::mc::ObjectInformation> const& info : this->object_infos) {
465 simgrid::mc::Variable* var = info->find_variable(name);
473 void Process::read_variable(const char* name, void* target, size_t size) const
475 simgrid::mc::Variable* var = this->find_variable(name);
477 xbt_die("No simple location for this variable");
478 if (!var->type->full_type)
479 xbt_die("Partial type for %s, cannot check size", name);
480 if ((size_t) var->type->full_type->byte_size != size)
481 xbt_die("Unexpected size for %s (expected %zi, was %zi)",
482 name, size, (size_t) var->type->full_type->byte_size);
483 this->read_bytes(target, size, remote(var->address));
486 char* Process::read_string(remote_ptr<void> address) const
491 return xbt_strdup((char*) address.address());
494 char* res = (char*) malloc(len);
498 ssize_t c = pread(this->memory_file, res + off, len - off, (off_t) address.address() + off);
503 xbt_die("Could not read from from remote process");
506 xbt_die("Could not read string from remote process");
508 void* p = memchr(res + off, '\0', c);
515 res = (char*) realloc(res, len);
520 const void *Process::read_bytes(void* buffer, std::size_t size,
521 remote_ptr<void> address, int process_index,
522 AddressSpace::ReadMode mode) const
524 if (process_index != simgrid::mc::ProcessIndexDisabled) {
525 std::shared_ptr<simgrid::mc::ObjectInformation> const& info =
526 this->find_object_info_rw((void*)address.address());
527 // Segment overlap is not handled.
529 if (info.get() && info.get()->privatized()) {
530 if (process_index < 0)
531 xbt_die("Missing process index");
532 if (process_index >= (int) MC_smpi_process_count())
533 xbt_die("Invalid process index");
535 // Read smpi_privatisation_regions from MCed:
536 smpi_privatisation_region_t remote_smpi_privatisation_regions =
537 mc_model_checker->process().read_variable<smpi_privatisation_region_t>(
538 "smpi_privatisation_regions");
540 s_smpi_privatisation_region_t privatisation_region =
541 mc_model_checker->process().read<s_smpi_privatisation_region_t>(
542 remote(remote_smpi_privatisation_regions + process_index));
544 // Address translation in the privaization segment:
545 size_t offset = address.address() - (std::uint64_t)info->start_rw;
546 address = remote((char*)privatisation_region.address + offset);
551 if (this->is_self()) {
552 if (mode == simgrid::mc::AddressSpace::Lazy)
553 return (void*)address.address();
555 memcpy(buffer, (void*)address.address(), size);
559 if (pread_whole(this->memory_file, buffer, size, address.address()) < 0)
560 xbt_die("Read from process %lli failed", (long long) this->pid_);
565 /** Write data to a process memory
567 * @param process the process
568 * @param local local memory address (source)
569 * @param remote target process memory address (target)
570 * @param len data size
572 void Process::write_bytes(const void* buffer, size_t len, remote_ptr<void> address)
574 if (this->is_self()) {
575 memcpy((void*)address.address(), buffer, len);
577 if (pwrite_whole(this->memory_file, buffer, len, address.address()) < 0)
578 xbt_die("Write to process %lli failed", (long long) this->pid_);
582 void Process::clear_bytes(remote_ptr<void> address, size_t len)
584 if (this->is_self()) {
585 memset((void*)address.address(), 0, len);
587 pthread_once(&zero_buffer_flag, MC_zero_buffer_init);
589 size_t s = len > zero_buffer_size ? zero_buffer_size : len;
590 this->write_bytes(zero_buffer, s, address);
591 address = remote((char*) address.address() + s);
597 void Process::ignore_region(std::uint64_t addr, std::size_t size)
599 IgnoredRegion region;
603 if (ignored_regions_.empty()) {
604 ignored_regions_.push_back(region);
608 unsigned int cursor = 0;
609 IgnoredRegion* current_region = nullptr;
612 int end = ignored_regions_.size() - 1;
613 while (start <= end) {
614 cursor = (start + end) / 2;
615 current_region = &ignored_regions_[cursor];
616 if (current_region->addr == addr) {
617 if (current_region->size == size)
619 else if (current_region->size < size)
623 } else if (current_region->addr < addr)
629 std::size_t position;
630 if (current_region->addr == addr) {
631 if (current_region->size < size) {
632 position = cursor + 1;
636 } else if (current_region->addr < addr) {
637 position = cursor + 1;
641 ignored_regions_.insert(
642 ignored_regions_.begin() + position, region);