1 /* Copyright (c) 2008-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
13 #include <sys/types.h>
17 # include <mach/mach_init.h>
18 # include <mach/mach_traps.h>
19 # include <mach/mach_port.h>
20 # include <mach/mach_vm.h>
21 # include <sys/mman.h>
22 # include <sys/param.h>
23 # if __MAC_OS_X_VERSION_MIN_REQUIRED < 1050
24 # define mach_vm_address_t vm_address_t
25 # define mach_vm_size_t vm_size_t
26 # if defined __ppc64__ || defined __x86_64__
27 # define mach_vm_region vm_region64
29 # define mach_vm_region vm_region
35 # include <sys/mman.h>
38 #if defined __FreeBSD__
39 # include <sys/types.h>
40 # include <sys/mman.h>
41 # include <sys/param.h>
42 # include <sys/queue.h>
43 # include <sys/socket.h>
44 # include <sys/sysctl.h>
45 # include <sys/user.h>
46 # include <libprocstat.h>
52 #include <xbt/sysdep.h>
54 #include "memory_map.hpp"
56 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_memory_map, xbt, "Logging specific to algorithms for memory_map");
62 * \todo This function contains many cases that do not allow for a
63 * recovery. Currently, xbt_abort() is called but we should
64 * much rather die with the specific reason so that it's easier
65 * to find out what's going on.
67 XBT_PRIVATE std::vector<VmMap> get_memory_map(pid_t pid)
69 std::vector<VmMap> ret;
73 /* Request authorization to read mappings */
74 if (task_for_pid(mach_task_self(), pid, &map) != KERN_SUCCESS) {
75 std::perror("task_for_pid failed");
76 xbt_die("Cannot request authorization for kernel information access");
80 * Darwin do not give us the number of mappings, so we read entries until
81 * we get an KERN_INVALID_ADDRESS return.
83 mach_vm_address_t address = VM_MIN_ADDRESS;
86 memory_object_name_t object;
88 #if defined __ppc64__ || defined __x86_64__
89 vm_region_flavor_t flavor = VM_REGION_BASIC_INFO_64;
90 struct vm_region_basic_info_64 info;
91 mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT_64;
93 vm_region_flavor_t flavor = VM_REGION_BASIC_INFO;
94 struct vm_region_basic_info info;
95 mach_msg_type_number_t info_count = VM_REGION_BASIC_INFO_COUNT;
104 (vm_region_info_t)&info,
107 if (kr == KERN_INVALID_ADDRESS) {
110 else if (kr != KERN_SUCCESS) {
111 std::perror("mach_vm_region failed");
112 xbt_die("Cannot request authorization for kernel information access");
118 memreg.start_addr = address;
119 memreg.end_addr = address + size;
122 memreg.prot = PROT_NONE;
123 if (info.protection & VM_PROT_READ)
124 memreg.prot |= PROT_READ;
125 if (info.protection & VM_PROT_WRITE)
126 memreg.prot |= PROT_WRITE;
127 if (info.protection & VM_PROT_EXECUTE)
128 memreg.prot |= PROT_EXEC;
130 /* Private (copy-on-write) or shared? */
133 memreg.flags |= MAP_SHARED;
135 memreg.flags |= MAP_PRIVATE;
138 memreg.offset = info.offset;
140 /* Device : not sure this can be mapped to something outside of Linux? */
141 memreg.dev_major = 0;
142 memreg.dev_minor = 0;
149 if (dladdr(reinterpret_cast<void*>(address), &dlinfo))
150 memreg.pathname = dlinfo.dli_fname;
152 XBT_DEBUG("Region: %016" PRIx64 "-%016" PRIx64 " | %c%c%c | %s", memreg.start_addr, memreg.end_addr,
153 (memreg.prot & PROT_READ) ? 'r' : '-', (memreg.prot & PROT_WRITE) ? 'w' : '-',
154 (memreg.prot & PROT_EXEC) ? 'x' : '-', memreg.pathname.c_str());
156 ret.push_back(std::move(memreg));
160 mach_port_deallocate(mach_task_self(), map);
161 #elif defined __linux__
162 /* Open the actual process's proc maps file and create the memory_map_t */
163 /* to be returned. */
164 std::string path = std::string("/proc/") + std::to_string(pid) + "/maps";
166 fp.rdbuf()->pubsetbuf(0, 0);
169 std::perror("open failed");
170 xbt_die("Cannot open %s to investigate the memory map of the process.", path.c_str());
173 /* Read one line at the time, parse it and add it to the memory map to be returned */
175 while (std::getline(fp, sline)) {
177 * The lines that we read have this format: (This is just an example)
178 * 00602000-00603000 rw-p 00002000 00:28 1837264 <complete-path-to-file>
180 char* line = &sline[0];
182 /* Tokenize the line using spaces as delimiters and store each token in lfields array. We expect 5 tokens for 6 fields */
183 char* saveptr = nullptr; // for strtok_r()
185 lfields[0] = strtok_r(line, " ", &saveptr);
188 for (i = 1; i < 6 && lfields[i - 1] != nullptr; i++) {
189 lfields[i] = strtok_r(nullptr, " ", &saveptr);
192 /* Check to see if we got the expected amount of columns */
194 xbt_die("The memory map apparently only supplied less than 6 columns. Recovery impossible.");
196 /* Ok we are good enough to try to get the info we need */
197 /* First get the start and the end address of the map */
198 char* tok = strtok_r(lfields[0], "-", &saveptr);
200 xbt_die("Start and end address of the map are not concatenated by a hyphen (-). Recovery impossible.");
204 memreg.start_addr = std::strtoull(tok, &endptr, 16);
205 /* Make sure that the entire string was an hex number */
209 tok = strtok_r(nullptr, "-", &saveptr);
213 memreg.end_addr = std::strtoull(tok, &endptr, 16);
214 /* Make sure that the entire string was an hex number */
218 /* Get the permissions flags */
219 if (std::strlen(lfields[1]) < 4)
223 for (i = 0; i < 3; i++){
224 switch(lfields[1][i]){
226 memreg.prot |= PROT_READ;
229 memreg.prot |= PROT_WRITE;
232 memreg.prot |= PROT_EXEC;
238 if (memreg.prot == 0)
239 memreg.prot |= PROT_NONE;
242 if (lfields[1][3] == 'p') {
243 memreg.flags |= MAP_PRIVATE;
245 memreg.flags |= MAP_SHARED;
246 if (lfields[1][3] != 's')
247 XBT_WARN("The protection is neither 'p' (private) nor 's' (shared) but '%s'. Let's assume shared, as on b0rken "
248 "win-ubuntu systems.\nFull line: %s\n",
252 /* Get the offset value */
253 memreg.offset = std::strtoull(lfields[2], &endptr, 16);
254 /* Make sure that the entire string was an hex number */
258 /* Get the device major:minor bytes */
259 tok = strtok_r(lfields[3], ":", &saveptr);
263 memreg.dev_major = (char) strtoul(tok, &endptr, 16);
264 /* Make sure that the entire string was an hex number */
268 tok = strtok_r(nullptr, ":", &saveptr);
272 memreg.dev_minor = (char) std::strtoul(tok, &endptr, 16);
273 /* Make sure that the entire string was an hex number */
277 /* Get the inode number and make sure that the entire string was a long int */
278 memreg.inode = strtoul(lfields[4], &endptr, 10);
282 /* And finally get the pathname */
284 memreg.pathname = lfields[5];
286 /* Create space for a new map region in the region's array and copy the */
287 /* parsed stuff from the temporal memreg variable */
288 XBT_DEBUG("Found region for %s", not memreg.pathname.empty() ? memreg.pathname.c_str() : "(null)");
290 ret.push_back(std::move(memreg));
294 #elif defined __FreeBSD__
295 struct procstat *prstat;
296 struct kinfo_proc *proc;
297 struct kinfo_vmentry *vmentries;
300 if ((prstat = procstat_open_sysctl()) == NULL) {
301 std::perror("procstat_open_sysctl failed");
302 xbt_die("Cannot access kernel state information");
304 if ((proc = procstat_getprocs(prstat, KERN_PROC_PID, pid, &cnt)) == NULL) {
305 std::perror("procstat_open_sysctl failed");
306 xbt_die("Cannot access process information");
308 if ((vmentries = procstat_getvmmap(prstat, proc, &cnt)) == NULL) {
309 std::perror("procstat_getvmmap failed");
310 xbt_die("Cannot access process memory mappings");
312 for (unsigned int i = 0; i < cnt; i++) {
316 memreg.start_addr = vmentries[i].kve_start;
317 memreg.end_addr = vmentries[i].kve_end;
320 memreg.prot = PROT_NONE;
321 if (vmentries[i].kve_protection & KVME_PROT_READ)
322 memreg.prot |= PROT_READ;
323 if (vmentries[i].kve_protection & KVME_PROT_WRITE)
324 memreg.prot |= PROT_WRITE;
325 if (vmentries[i].kve_protection & KVME_PROT_EXEC)
326 memreg.prot |= PROT_EXEC;
328 /* Private (copy-on-write) or shared? */
330 if (vmentries[i].kve_flags & KVME_FLAG_COW)
331 memreg.flags |= MAP_PRIVATE;
333 memreg.flags |= MAP_SHARED;
336 memreg.offset = vmentries[i].kve_offset;
338 /* Device : not sure this can be mapped to something outside of Linux? */
339 memreg.dev_major = 0;
340 memreg.dev_minor = 0;
343 memreg.inode = vmentries[i].kve_vn_fileid;
346 * Path. Linuxize result by giving an anonymous mapping a path from
347 * the previous mapping, provided previous is vnode and has a path,
348 * and mark the stack.
350 if (vmentries[i].kve_path[0] != '\0')
351 memreg.pathname = vmentries[i].kve_path;
352 else if (vmentries[i].kve_type == KVME_TYPE_DEFAULT && vmentries[i - 1].kve_type == KVME_TYPE_VNODE &&
353 vmentries[i - 1].kve_path[0] != '\0')
354 memreg.pathname = vmentries[i-1].kve_path;
355 else if (vmentries[i].kve_type == KVME_TYPE_DEFAULT
356 && vmentries[i].kve_flags & KVME_FLAG_GROWS_DOWN)
357 memreg.pathname = "[stack]";
360 * One last dirty modification: remove write permission from shared
361 * libraries private clean pages. This is necessary because simgrid
362 * later identifies mappings based on the permissions that are expected
363 * when running the Linux kernel.
365 if (vmentries[i].kve_type == KVME_TYPE_VNODE && not(vmentries[i].kve_flags & KVME_FLAG_NEEDS_COPY))
366 memreg.prot &= ~PROT_WRITE;
368 ret.push_back(std::move(memreg));
370 procstat_freevmmap(prstat, vmentries);
371 procstat_freeprocs(prstat, proc);
372 procstat_close(prstat);
374 xbt_die("Could not get memory map from process %lli", (long long int) pid);