1 /* Copyright (c) 2008-2012 Da 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. */
7 #include "mc_private.h"
8 #include "xbt/module.h"
10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
11 "Logging specific to mc_checkpoint");
13 void *start_text_libsimgrid;
14 void *start_plt, *end_plt;
15 char *libsimgrid_path;
17 static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size);
18 static void MC_region_restore(mc_mem_region_t reg);
19 static void MC_region_destroy(mc_mem_region_t reg);
21 static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size);
23 static int data_program_region_compare(void *d1, void *d2, size_t size);
24 static int data_libsimgrid_region_compare(void *d1, void *d2, size_t size);
26 static mc_mem_region_t MC_region_new(int type, void *start_addr, size_t size)
28 mc_mem_region_t new_reg = xbt_new0(s_mc_mem_region_t, 1);
30 new_reg->start_addr = start_addr;
32 new_reg->data = xbt_malloc0(size);
33 memcpy(new_reg->data, start_addr, size);
35 XBT_DEBUG("New region : type : %d, data : %p, size : %zu", type, new_reg->data, size);
40 static void MC_region_restore(mc_mem_region_t reg)
42 /*FIXME: check if start_addr is still mapped, if it is not, then map it
43 before copying the data */
45 memcpy(reg->start_addr, reg->data, reg->size);
50 static void MC_region_destroy(mc_mem_region_t reg)
56 static void MC_snapshot_add_region(mc_snapshot_t snapshot, int type, void *start_addr, size_t size)
58 mc_mem_region_t new_reg = MC_region_new(type, start_addr, size);
59 snapshot->regions = xbt_realloc(snapshot->regions, (snapshot->num_reg + 1) * sizeof(mc_mem_region_t));
60 snapshot->regions[snapshot->num_reg] = new_reg;
65 void MC_take_snapshot(mc_snapshot_t snapshot)
69 memory_map_t maps = get_memory_map();
71 /* Save the std heap and the writable mapped pages of libsimgrid */
72 while (i < maps->mapsize) {
73 reg = maps->regions[i];
74 if ((reg.prot & PROT_WRITE)){
75 if (maps->regions[i].pathname == NULL){
76 if (reg.start_addr == std_heap){ // only save the std heap (and not the raw one)
77 MC_snapshot_add_region(snapshot, 0, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
80 if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
81 MC_snapshot_add_region(snapshot, 1, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
88 free_memory_map(maps);
91 void MC_take_snapshot_liveness(mc_snapshot_t snapshot)
95 memory_map_t maps = get_memory_map();
98 /* Save the std heap and the writable mapped pages of libsimgrid */
99 while (i < maps->mapsize && nb_reg < 3) {
100 reg = maps->regions[i];
101 if ((reg.prot & PROT_WRITE)){
102 if (maps->regions[i].pathname == NULL){
103 if (reg.start_addr == std_heap){ // only save the std heap (and not the raw one)
104 MC_snapshot_add_region(snapshot, 0, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
108 if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
109 MC_snapshot_add_region(snapshot, 1, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
112 if (!memcmp(basename(maps->regions[i].pathname), basename(xbt_binary_name), strlen(basename(xbt_binary_name)))){
113 MC_snapshot_add_region(snapshot, 2, reg.start_addr, (char*)reg.end_addr - (char*)reg.start_addr);
118 }else if ((reg.prot & PROT_READ)){
119 if (maps->regions[i].pathname != NULL){
120 if (!memcmp(basename(maps->regions[i].pathname), "libsimgrid", 10)){
121 start_text_libsimgrid = reg.start_addr;
122 libsimgrid_path = strdup(maps->regions[i].pathname);
129 free_memory_map(maps);
133 void MC_restore_snapshot(mc_snapshot_t snapshot)
136 for(i=0; i < snapshot->num_reg; i++){
137 MC_region_restore(snapshot->regions[i]);
142 void MC_free_snapshot(mc_snapshot_t snapshot)
145 for(i=0; i < snapshot->num_reg; i++)
146 MC_region_destroy(snapshot->regions[i]);
151 static int data_program_region_compare(void *d1, void *d2, size_t size){
155 for(i=0; i<size; i++){
156 if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
157 XBT_DEBUG("Different byte (offset=%zu) (%p - %p) in data program region", i, (char *)d1 + i, (char *)d2 + i);
162 XBT_DEBUG("Hamming distance between data program regions : %d", distance);
167 static int data_libsimgrid_region_compare(void *d1, void *d2, size_t size){
171 void *addr_pointed1 = NULL, *addr_pointed2 = NULL;
173 for(i=0; i<size; i++){
174 if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
175 pointer_align = (i / sizeof(void*)) * sizeof(void*);
176 addr_pointed1 = *((void **)((char *)d1 + pointer_align));
177 addr_pointed2 = *((void **)((char *)d2 + pointer_align));
178 if((addr_pointed1 > start_plt && addr_pointed1 < end_plt) || (addr_pointed2 > start_plt && addr_pointed2 < end_plt)){
181 XBT_DEBUG("Different byte (offset=%zu) (%p - %p) in data libsimgrid region", i, (char *)d1 + i, (char *)d2 + i);
187 XBT_DEBUG("Hamming distance between data libsimgrid regions : %d", distance); fflush(NULL);
192 int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
196 if(s1->num_reg != s2->num_reg){
197 XBT_DEBUG("Different num_reg (s1 = %u, s2 = %u)", s1->num_reg, s2->num_reg);
201 for(i=0 ; i< s1->num_reg ; i++){
203 if(s1->regions[i]->type != s2->regions[i]->type){
204 XBT_INFO("Different type of region");
208 switch(s1->regions[i]->type){
210 /* Compare heapregion */
211 if(s1->regions[i]->size != s2->regions[i]->size){
212 XBT_DEBUG("Different size of heap (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
215 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
216 XBT_DEBUG("Different start addr of heap (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
219 if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[i]->data, (xbt_mheap_t)s2->regions[i]->data)){
220 XBT_DEBUG("Different heap (mmalloc_compare)");
225 /* Compare data libsimgrid region */
226 if(s1->regions[i]->size != s2->regions[i]->size){
227 XBT_DEBUG("Different size of libsimgrid (data) (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
230 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
231 XBT_DEBUG("Different start addr of libsimgrid (data) (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
234 if(data_libsimgrid_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
235 XBT_DEBUG("Different memcmp for data in libsimgrid");
241 /* Compare data program region */
242 if(s1->regions[i]->size != s2->regions[i]->size){
243 XBT_DEBUG("Different size of data program (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
247 if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
248 XBT_DEBUG("Different start addr of data program (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
252 if(data_program_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
253 XBT_DEBUG("Different memcmp for data in program");
268 void get_plt_section(){
271 char *line = NULL; /* Temporal storage for each line that is readed */
272 ssize_t read; /* Number of bytes readed */
273 size_t n = 0; /* Amount of bytes to read by getline */
276 int i, plt_not_found = 1;
277 unsigned long int size, offset;
280 sprintf(command, "objdump --section-headers %s", libsimgrid_path);
282 fp = popen(command, "r");
285 perror("popen failed");
287 while ((read = getline(&line, &n, fp)) != -1 && plt_not_found) {
292 /* Wipeout the new line character */
293 line[read - 1] = '\0';
295 lfields[0] = strtok(line, " ");
297 if(lfields[0] == NULL)
300 if(strcmp(lfields[0], "Sections:") == 0 || strcmp(lfields[0], "Idx") == 0 || strcmp(lfields[0], "libsimgrid.so:") == 0)
303 for (i = 1; i < 7 && lfields[i - 1] != NULL; i++) {
304 lfields[i] = strtok(NULL, " ");
308 if(strcmp(lfields[1], ".plt") == 0){
309 size = strtoul(lfields[2], NULL, 16);
310 offset = strtoul(lfields[4], NULL, 16);
311 start_plt = (char *)start_text_libsimgrid + offset;
312 end_plt = (char *)start_plt + size;
313 fprintf(stderr, ".plt section : %p - %p \n", start_plt, end_plt);