+#include <assert.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
#include <regex.h>
#include <sys/mman.h> // PROT_*
+#include <pthread.h>
+
#include <libgen.h>
#include "mc_process.h"
#include "mc_object_info.h"
+#include "mc_address_space.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_process, mc,
"MC process information");
static void MC_process_init_memory_map_info(mc_process_t process);
static void MC_process_open_memory_file(mc_process_t process);
+static s_mc_address_space_class_t mc_process_class = {
+ .read = (void*) &MC_process_read
+};
void MC_process_init(mc_process_t process, pid_t pid)
{
+ process->address_space.address_space_class = &mc_process_class;
process->process_flags = MC_PROCESS_NO_FLAG;
process->pid = pid;
if (pid==getpid())
process->process_flags |= MC_PROCESS_SELF_FLAG;
process->memory_map = MC_get_memory_map(pid);
process->memory_file = -1;
+ process->cache_flags = 0;
+ process->heap = NULL;
+ process->heap_info = NULL;
MC_process_init_memory_map_info(process);
MC_process_open_memory_file(process);
+
+ // Read std_heap (is a struct mdesc*):
+ dw_variable_t std_heap_var = MC_process_find_variable_by_name(process, "std_heap");
+ if (!std_heap_var)
+ xbt_die("No heap information in the target process");
+ if(!std_heap_var->address)
+ xbt_die("No constant address for this variable");
+ MC_process_read(process, MC_ADDRESS_SPACE_READ_FLAGS_NONE,
+ &process->heap_address, std_heap_var->address, sizeof(struct mdesc*),
+ MC_PROCESS_INDEX_DISABLED);
}
void MC_process_clear(mc_process_t process)
{
+ process->address_space.address_space_class = NULL;
process->process_flags = MC_PROCESS_NO_FLAG;
process->pid = 0;
if (process->memory_file >= 0) {
close(process->memory_file);
}
+
+ process->cache_flags = 0;
+
+ free(process->heap);
+ process->heap = NULL;
+
+ free(process->heap_info);
+ process->heap_info = NULL;
+}
+
+void MC_process_refresh_heap(mc_process_t process)
+{
+ assert(!MC_process_is_self(process));
+ // Read/dereference/refresh the std_heap pointer:
+ if (!process->heap) {
+ xbt_mheap_t oldheap = mmalloc_get_current_heap();
+ MC_SET_MC_HEAP;
+ process->heap = malloc(sizeof(struct mdesc));
+ mmalloc_set_current_heap(oldheap);
+ }
+ MC_process_read(process, MC_ADDRESS_SPACE_READ_FLAGS_NONE,
+ process->heap, process->heap_address, sizeof(struct mdesc),
+ MC_PROCESS_INDEX_DISABLED
+ );
+}
+
+void MC_process_refresh_malloc_info(mc_process_t process)
+{
+ assert(!MC_process_is_self(process));
+ if (!process->cache_flags & MC_PROCESS_CACHE_FLAG_HEAP)
+ MC_process_refresh_heap(process);
+ // Refresh process->heapinfo:
+ size_t malloc_info_bytesize = process->heap->heaplimit * sizeof(malloc_info);
+
+ xbt_mheap_t oldheap = mmalloc_get_current_heap();
+ MC_SET_MC_HEAP;
+ process->heap_info = (malloc_info*) realloc(process->heap_info,
+ malloc_info_bytesize);
+ mmalloc_set_current_heap(oldheap);
+
+ MC_process_read(process, MC_ADDRESS_SPACE_READ_FLAGS_NONE,
+ process->heap_info,
+ process->heap->heapinfo, malloc_info_bytesize,
+ MC_PROCESS_INDEX_DISABLED);
}
#define SO_RE "\\.so[\\.0-9]*$"
XBT_INFO("Get debug information done !");
}
-mc_object_info_t MC_process_find_object_info(mc_process_t process, void *ip)
+mc_object_info_t MC_process_find_object_info(mc_process_t process, const void *addr)
+{
+ size_t i;
+ for (i = 0; i != process->object_infos_size; ++i) {
+ if (addr >= (void *) process->object_infos[i]->start
+ && addr <= (void *) process->object_infos[i]->end) {
+ return process->object_infos[i];
+ }
+ }
+ return NULL;
+}
+
+mc_object_info_t MC_process_find_object_info_exec(mc_process_t process, const void *addr)
+{
+ size_t i;
+ for (i = 0; i != process->object_infos_size; ++i) {
+ if (addr >= (void *) process->object_infos[i]->start_exec
+ && addr <= (void *) process->object_infos[i]->end_exec) {
+ return process->object_infos[i];
+ }
+ }
+ return NULL;
+}
+
+mc_object_info_t MC_process_find_object_info_rw(mc_process_t process, const void *addr)
{
size_t i;
for (i = 0; i != process->object_infos_size; ++i) {
- if (ip >= (void *) process->object_infos[i]->start_exec
- && ip <= (void *) process->object_infos[i]->end_exec) {
+ if (addr >= (void *) process->object_infos[i]->start_rw
+ && addr <= (void *) process->object_infos[i]->end_rw) {
return process->object_infos[i];
}
}
return NULL;
}
-dw_frame_t MC_process_find_function(mc_process_t process, void *ip)
+// Functions, variables…
+
+dw_frame_t MC_process_find_function(mc_process_t process, const void *ip)
{
- mc_object_info_t info = MC_process_find_object_info(process, ip);
+ mc_object_info_t info = MC_process_find_object_info_exec(process, ip);
if (info == NULL)
return NULL;
else
return MC_file_object_info_find_function(info, ip);
}
+dw_variable_t MC_process_find_variable_by_name(mc_process_t process, const char* name)
+{
+ const size_t n = process->object_infos_size;
+ size_t i;
+ for (i=0; i!=n; ++i) {
+ mc_object_info_t info =process->object_infos[i];
+ dw_variable_t var = MC_file_object_info_find_variable_by_name(info, name);
+ if (var)
+ return var;
+ }
+ return NULL;
+}
+
// ***** Memory access
static void MC_process_open_memory_file(mc_process_t process)
return real_count;
}
-void MC_process_read(mc_process_t process, void* local, const void* remote, size_t len)
+const void* MC_process_read(mc_process_t process, e_adress_space_read_flags_t flags,
+ void* local, const void* remote, size_t len,
+ int process_index)
{
+ if (process_index != MC_PROCESS_INDEX_DISABLED) {
+ mc_object_info_t info = MC_process_find_object_info_rw(process, remote);
+ // Segment overlap is not handled.
+ if (MC_object_info_is_privatized(info)) {
+ if (process_index < 0)
+ xbt_die("Missing process index");
+ // Address translation in the privaization segment:
+ size_t offset = (const char*) remote - info->start_rw;
+ remote = (const char*) remote - offset;
+ }
+ }
+
if (MC_process_is_self(process)) {
- memcpy(local, remote, len);
+ if (flags & MC_ADDRESS_SPACE_READ_FLAGS_LAZY)
+ return remote;
+ else {
+ memcpy(local, remote, len);
+ return local;
+ }
} else {
if (pread_whole(process->memory_file, local, len, (off_t) remote) < 0)
xbt_die("Read from process %lli failed", (long long) process->pid);
+ return local;
}
}
xbt_die("Write to process %lli failed", (long long) process->pid);
}
}
+
+static pthread_once_t zero_buffer_flag = PTHREAD_ONCE_INIT;
+static const void* zero_buffer;
+static const int zero_buffer_size = 10 * 4096;
+
+static void MC_zero_buffer_init(void)
+{
+ int fd = open("/dev/zero", O_RDONLY);
+ if (fd<0)
+ xbt_die("Could not open /dev/zero");
+ zero_buffer = mmap(NULL, zero_buffer_size, PROT_READ, MAP_SHARED, fd, 0);
+ if (zero_buffer == MAP_FAILED)
+ xbt_die("Could not map the zero buffer");
+ close(fd);
+}
+
+void MC_process_clear_memory(mc_process_t process, void* remote, size_t len)
+{
+ if (MC_process_is_self(process)) {
+ memset(remote, 0, len);
+ } else {
+ pthread_once(&zero_buffer_flag, MC_zero_buffer_init);
+ while (len) {
+ size_t s = len > zero_buffer_size ? zero_buffer_size : len;
+ MC_process_write(process, zero_buffer, remote, s);
+ remote = (char*) remote + s;
+ len -= s;
+ }
+ }
+}
