+#include <assert.h>
#include <stddef.h>
#include <stdbool.h>
#include <stdint.h>
+#include <errno.h>
#include <sys/types.h>
+#include <fcntl.h>
#include <unistd.h>
#include <regex.h>
#include <sys/mman.h> // PROT_*
+#include <pthread.h>
+
#include <libgen.h>
+#include <libunwind.h>
+#include <libunwind-ptrace.h>
+
+#include <xbt/mmalloc.h>
+
#include "mc_process.h"
#include "mc_object_info.h"
+#include "mc_address_space.h"
+#include "mc_unw.h"
+#include "mc_snapshot.h"
+#include "mc_ignore.h"
+#include "mc_smx.h"
+#include "mc_server.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_process, mc,
"MC process information");
-static void MC_init_memory_map_info(mc_process_t process);
+static void MC_process_init_memory_map_info(mc_process_t process);
+static void MC_process_open_memory_file(mc_process_t process);
+
+// ***** Destructor callbacks
+
+// ***** mc_address_space methods for mc_process
+
+static mc_process_t MC_process_get_process(mc_process_t p) {
+ return p;
+}
+
+static const s_mc_address_space_class_t mc_process_class = {
+ .read = (void*) &MC_process_read,
+ .get_process = (void*) MC_process_get_process
+};
-void MC_process_init(mc_process_t process, pid_t pid)
+bool MC_is_process(mc_address_space_t p)
{
+ return p->address_space_class == &mc_process_class;
+}
+
+// ***** mc_process
+
+void MC_process_init(mc_process_t process, pid_t pid, int sockfd)
+{
+ process->address_space.address_space_class = &mc_process_class;
process->process_flags = MC_PROCESS_NO_FLAG;
+ process->socket = sockfd;
process->pid = pid;
if (pid==getpid())
process->process_flags |= MC_PROCESS_SELF_FLAG;
+ process->running = true;
+ process->status = 0;
process->memory_map = MC_get_memory_map(pid);
- MC_init_memory_map_info(process);
+ 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);
+
+ process->smx_process_infos = MC_smx_process_info_list_new();
+ process->smx_old_process_infos = MC_smx_process_info_list_new();
+
+ process->checkpoint_ignore = MC_checkpoint_ignore_new();
+
+ process->unw_addr_space = unw_create_addr_space(&mc_unw_accessors , __BYTE_ORDER);
+ if (process->process_flags & MC_PROCESS_SELF_FLAG) {
+ process->unw_underlying_addr_space = unw_local_addr_space;
+ process->unw_underlying_context = NULL;
+ } else {
+ process->unw_underlying_addr_space = unw_create_addr_space(&mc_unw_vmread_accessors, __BYTE_ORDER);
+ process->unw_underlying_context = _UPT_create(pid);
+ }
}
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;
process->maestro_stack_start = NULL;
process->maestro_stack_end = NULL;
+ xbt_dynar_free(&process->checkpoint_ignore);
+
+ xbt_dynar_free(&process->smx_process_infos);
+ xbt_dynar_free(&process->smx_old_process_infos);
+
size_t i;
for (i=0; i!=process->object_infos_size; ++i) {
MC_free_object_info(&process->object_infos[i]);
free(process->object_infos);
process->object_infos = NULL;
process->object_infos_size = 0;
+ if (process->memory_file >= 0) {
+ close(process->memory_file);
+ }
+
+ if (process->unw_underlying_addr_space != unw_local_addr_space) {
+ unw_destroy_addr_space(process->unw_underlying_addr_space);
+ _UPT_destroy(process->unw_underlying_context);
+ }
+ process->unw_underlying_context = NULL;
+ process->unw_underlying_addr_space = NULL;
+
+ unw_destroy_addr_space(process->unw_addr_space);
+ process->unw_addr_space = NULL;
+
+ 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_set_current_heap(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 + 1) * sizeof(malloc_info);
+
+ xbt_mheap_t heap = mmalloc_set_current_heap(mc_heap);
+ process->heap_info = realloc(process->heap_info, malloc_info_bytesize);
+ mmalloc_set_current_heap(heap);
+
+ 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]*$"
"libunwind",
"libunwind-x86_64",
"libunwind-x86",
+ "libunwind-ptrace",
"libdw",
"libdl",
"librt",
}
/** @brief Finds the range of the different memory segments and binary paths */
-static void MC_init_memory_map_info(mc_process_t process)
+static void MC_process_init_memory_map_info(mc_process_t process)
{
- XBT_INFO("Get debug information ...");
+ XBT_DEBUG("Get debug information ...");
process->maestro_stack_start = NULL;
process->maestro_stack_end = NULL;
process->object_infos = NULL;
for (i=0; i!=process->object_infos_size; ++i)
MC_post_process_object_info(process, process->object_infos[i]);
- xbt_assert(process->maestro_stack_start, "maestro_stack_start");
- xbt_assert(process->maestro_stack_end, "maestro_stack_end");
+ xbt_assert(process->maestro_stack_start, "Did not find maestro_stack_start");
+ xbt_assert(process->maestro_stack_end, "Did not find maestro_stack_end");
+
+ XBT_DEBUG("Get debug information done !");
+}
+
+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;
+}
- XBT_INFO("Get debug information done !");
+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(mc_process_t process, void *ip)
+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;
+
+ // First lookup the variable in the executable shared object.
+ // A global variable used directly by the executable code from a library
+ // is reinstanciated in the executable memory .data/.bss.
+ // We need to look up the variable in the execvutable first.
+ if (process->binary_info) {
+ mc_object_info_t info = process->binary_info;
+ dw_variable_t var = MC_file_object_info_find_variable_by_name(info, name);
+ if (var)
+ return var;
+ }
+
+ 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;
+}
+
+void MC_process_read_variable(mc_process_t process, const char* name, void* target, size_t size)
+{
+ dw_variable_t var = MC_process_find_variable_by_name(process, name);
+ if (!var->address)
+ xbt_die("No simple location for this variable");
+ if (!var->type->full_type)
+ xbt_die("Partial type for %s, cannot check size", name);
+ if (var->type->full_type->byte_size != size)
+ xbt_die("Unexpected size for %s (expected %zi, was %zi)",
+ name, size, (size_t) var->type->full_type->byte_size);
+ MC_process_read(process, MC_PROCESS_NO_FLAG, target, var->address, size,
+ MC_PROCESS_INDEX_ANY);
+}
+
+char* MC_process_read_string(mc_process_t process, void* address)
+{
+ if (!address)
+ return NULL;
+ if (MC_process_is_self(process))
+ return strdup((char*) address);
+
+ size_t len = 128;
+ char* res = malloc(len);
+ off_t off = 0;
+
+ while (1) {
+ ssize_t c = pread(process->memory_file, res + off, len - off, (off_t) address + off);
+ if (c == -1) {
+ if (errno == EINTR)
+ continue;
+ else
+ xbt_die("Could not read from from remote process");
+ }
+ if (c==0)
+ xbt_die("Could not read string from remote process");
+
+ void* p = memchr(res + off, '\0', c);
+ if (p)
+ return res;
+
+ off += c;
+ if (off == len) {
+ len *= 2;
+ res = realloc(res, len);
+ }
+ }
+}
+
+// ***** Memory access
+
+int MC_process_vm_open(pid_t pid, int flags)
+{
+ const size_t buffer_size = 30;
+ char buffer[buffer_size];
+ int res = snprintf(buffer, buffer_size, "/proc/%lli/mem", (long long) pid);
+ if (res < 0 || res >= buffer_size) {
+ errno = ENAMETOOLONG;
+ return -1;
+ }
+ return open(buffer, flags);
+}
+
+static void MC_process_open_memory_file(mc_process_t process)
+{
+ if (MC_process_is_self(process) || process->memory_file >= 0)
+ return;
+
+ int fd = MC_process_vm_open(process->pid, O_RDWR);
+ if (fd<0)
+ xbt_die("Could not open file for process virtual address space");
+ process->memory_file = fd;
+}
+
+static ssize_t pread_whole(int fd, void *buf, size_t count, off_t offset)
+{
+ char* buffer = (char*) buf;
+ ssize_t real_count = count;
+ while (count) {
+ ssize_t res = pread(fd, buffer, count, offset);
+ if (res > 0) {
+ count -= res;
+ buffer += res;
+ offset += res;
+ } else if (res==0) {
+ return -1;
+ } else if (errno != EINTR) {
+ return -1;
+ }
+ }
+ return real_count;
+}
+
+static ssize_t pwrite_whole(int fd, const void *buf, size_t count, off_t offset)
+{
+ const char* buffer = (const char*) buf;
+ ssize_t real_count = count;
+ while (count) {
+ ssize_t res = pwrite(fd, buffer, count, offset);
+ if (res > 0) {
+ count -= res;
+ buffer += res;
+ offset += res;
+ } else if (res==0) {
+ return -1;
+ } else if (errno != EINTR) {
+ return -1;
+ }
+ }
+ return real_count;
+}
+
+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)) {
+ 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;
+ }
+}
+
+const void* MC_process_read_simple(mc_process_t process,
+ void* local, const void* remote, size_t len)
+{
+ e_adress_space_read_flags_t flags = MC_PROCESS_NO_FLAG;
+ int index = MC_PROCESS_INDEX_ANY;
+ MC_process_read(process, flags, local, remote, len, index);
+ return local;
+}
+
+const void* MC_process_read_dynar_element(mc_process_t process,
+ void* local, const void* remote_dynar, size_t i, size_t len)
+{
+ s_xbt_dynar_t d;
+ MC_process_read_simple(process, &d, remote_dynar, sizeof(d));
+ if (i >= d.used)
+ xbt_die("Out of bound index %zi/%zi", i, d.used);
+ if (len != d.elmsize)
+ xbt_die("Bad size in MC_process_read_dynar_element");
+ MC_process_read_simple(process, local, xbt_dynar_get_ptr(&d, i), len);
+ return local;
+}
+
+void MC_process_write(mc_process_t process, const void* local, void* remote, size_t len)
+{
+ if (MC_process_is_self(process)) {
+ memcpy(remote, local, len);
+ } else {
+ if (pwrite_whole(process->memory_file, local, len, (off_t) remote) < 0)
+ xbt_die("Write to process %lli failed", (long long) process->pid);
+ }
+}
+
+unsigned long MC_process_read_dynar_length(mc_process_t process, const void* remote_dynar)
+{
+ if (!remote_dynar)
+ return 0;
+ unsigned long res;
+ MC_process_read_simple(process, &res,
+ &((xbt_dynar_t)remote_dynar)->used, sizeof(res));
+ return res;
+}
+
+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;
+ }
+ }
+}
+
+void MC_simcall_handle(smx_simcall_t req, int value)
+{
+ if (MC_process_is_self(&mc_model_checker->process)) {
+ SIMIX_simcall_handle(req, value);
+ return;
+ }
+
+ unsigned i;
+ mc_smx_process_info_t pi = NULL;
+
+ xbt_dynar_foreach_ptr(mc_model_checker->process.smx_process_infos, i, pi) {
+ if (req == &pi->copy.simcall) {
+ MC_server_simcall_handle(&mc_model_checker->process, pi->copy.pid, value);
+ return;
+ }
+ }
+
+ xbt_die("Could not find the request");
+}
