int setup_mmap_aux(int which_fd, int which_mmap) {
int i,flags,prot,size;
i=find_empty_mmap();
if (i<0) return -1;
size=mmap_random_size(0);
prot=mmap_random_prot();
flags=mmap_random_flags();
/* need locking? */
mmaps[i].addr=MAP_FAILED;
mmaps[i].prot=prot;
mmaps[i].flags=flags;
mmaps[i].size=size;
mmaps[i].aux=1;
mmaps[i].parent_mmap=which_mmap;
if (!ignore_but_dont_skip.mmap) {
stats.mmap_aux_attempts++;
/* Hook into existing mmap */
struct perf_event_mmap_page *mmap_control;
mmap_control = (struct perf_event_mmap_page *)
mmaps[which_mmap].addr;
if ((mmap_control!=NULL) &&
(mmaps[which_mmap].prot&PROT_WRITE)) {
mmap_control->aux_offset=mmaps[which_mmap].size;
mmap_control->aux_size=mmaps[i].size;
}
mmaps[i].addr=mmap(NULL, size,
prot, flags,
event_data[which_fd].fd, mmaps[which_mmap].size);
if (mmaps[i].addr==MAP_FAILED) {
mmaps[i].addr=MAP_FAILED;
#if LOG_FAILURES
if (logging&TYPE_MMAP) {
if (trigger_failure_logging) {
sprintf(log_buffer,"# M %d %d %p\n",
mmaps[i].size,
event_data[which_fd].fd,
mmaps[i].addr);
write(log_fd,log_buffer,
strlen(log_buffer));
}
}
#endif
return -1;
}
else {
active_mmaps++;
event_data[which_fd].mmap=i;
mmaps[i].fd=event_data[which_fd].fd;
if (logging&TYPE_MMAP) {
sprintf(log_buffer,"M %d %d %p\n",
mmaps[i].size,
event_data[which_fd].fd,
mmaps[i].addr);
write(log_fd,log_buffer,strlen(log_buffer));
}
stats.mmap_aux_successful++;
}
}
mmaps[i].active=1;
// if (mmaps[i].addr==NULL) printf("b%d.active=1 %p\n",i,mmaps[i].addr);
return 0;
}
int setup_mmap_aux(int which_fd, int which_mmap) {
int i,flags,prot;
i=find_empty_mmap();
if (i<0) return -1;
/* need locking? */
mmaps[i].active=1;
/* to be valid we really want to be 2^x pages */
switch(rand()%3) {
case 0: mmaps[i].size=(rand()%64)*getpagesize();
break;
case 1: mmaps[i].size=
((1<<rand()%10) )*getpagesize();
break;
default: mmaps[i].size=rand()%65535;
}
mmaps[i].addr=NULL;
prot=mmap_random_prot();
flags=mmap_random_flags();
mmaps[i].prot=prot;
mmaps[i].flags=flags;
mmaps[i].aux=1;
mmaps[i].parent_mmap=which_mmap;
if (!ignore_but_dont_skip.mmap) {
stats.mmap_aux_attempts++;
/* Hook into existing mmap */
struct perf_event_mmap_page *mmap_control;
mmap_control = (struct perf_event_mmap_page *)
mmaps[which_mmap].addr;
if ((mmap_control!=NULL) &&
(mmaps[which_mmap].prot&PROT_WRITE)) {
mmap_control->aux_offset=mmaps[which_mmap].size;
mmap_control->aux_size=mmaps[i].size;
}
mmaps[i].addr=mmap(NULL, mmaps[i].size,
prot, flags,
event_data[which_fd].fd, mmaps[which_mmap].size);
if (mmaps[i].addr==MAP_FAILED) {
mmaps[i].addr=NULL;
mmaps[i].active=0;
#if LOG_FAILURES
if (logging&TYPE_MMAP) {
if (trigger_failure_logging) {
sprintf(log_buffer,"# M %d %d %p\n",
mmaps[i].size,
event_data[which_fd].fd,
mmaps[i].addr);
write(log_fd,log_buffer,
strlen(log_buffer));
}
}
#endif
}
else {
active_mmaps++;
event_data[which_fd].mmap=i;
mmaps[i].fd=event_data[which_fd].fd;
if (logging&TYPE_MMAP) {
sprintf(log_buffer,"M %d %d %p\n",
mmaps[i].size,
event_data[which_fd].fd,
mmaps[i].addr);
write(log_fd,log_buffer,strlen(log_buffer));
}
stats.mmap_aux_successful++;
}
}
return 0;
}
/* active is set to 1 but addr is not valid. */
int setup_mmap(int which) {
int i,prot,flags,size;
i=find_empty_mmap();
if (i<0) return -1;
size=mmap_random_size(1);
prot=mmap_random_prot();
flags=mmap_random_flags();
/* need locking? */
// mmaps[i].active=1;
mmaps[i].addr=MAP_FAILED;
mmaps[i].prot=prot;
mmaps[i].flags=flags;
mmaps[i].size=size;
mmaps[i].aux=0;
if (!ignore_but_dont_skip.mmap) {
stats.mmap_attempts++;
mmaps[i].addr=mmap(NULL, size,
prot, flags,
event_data[which].fd, 0);
/* If running as root, with MAP_FIXED, NULL is a valid addr */
// if (mmaps[i].addr==NULL) {
// printf("This can't happen???\n");
// }
if (mmaps[i].addr==MAP_FAILED) {
mmaps[i].addr=MAP_FAILED;
#if LOG_FAILURES
if (logging&TYPE_MMAP) {
if (trigger_failure_logging) {
sprintf(log_buffer,"# M %d %d %p\n",
mmaps[i].size,
event_data[which].fd,
mmaps[i].addr);
write(log_fd,log_buffer,
strlen(log_buffer));
}
}
#endif
return -1;
}
else {
active_mmaps++;
event_data[which].mmap=i;
mmaps[i].fd=event_data[which].fd;
mmaps[i].which_event=which;
if (logging&TYPE_MMAP) {
sprintf(log_buffer,"M %d %d %p\n",
mmaps[i].size,
event_data[which].fd,
mmaps[i].addr);
write(log_fd,log_buffer,strlen(log_buffer));
}
stats.mmap_successful++;
}
}
mmaps[i].active=1;
// if (mmaps[i].addr==NULL) printf("%d.active=1 %p\n",i,mmaps[i].addr);
/* Randomly try to set up an aux mmap too */
if (rand()%4==0) {
setup_mmap_aux(which,i);
}
return 0;
}
int setup_mmap(int which) {
int i,prot,flags;
i=find_empty_mmap();
if (i<0) return -1;
/* need locking? */
mmaps[i].active=1;
/* to be valid we really want to be 1+2^x pages */
switch(rand()%3) {
case 0: mmaps[i].size=(rand()%64)*getpagesize();
break;
case 1: mmaps[i].size=
(1 + (1<<rand()%10) )*getpagesize();
break;
default: mmaps[i].size=rand()%65535;
}
mmaps[i].addr=NULL;
prot=mmap_random_prot();
flags=mmap_random_flags();
mmaps[i].prot=prot;
mmaps[i].flags=flags;
mmaps[i].aux=0;
if (!ignore_but_dont_skip.mmap) {
stats.mmap_attempts++;
mmaps[i].addr=mmap(NULL, mmaps[i].size,
prot, flags,
event_data[which].fd, 0);
if (mmaps[i].addr==MAP_FAILED) {
mmaps[i].addr=NULL;
mmaps[i].active=0;
#if LOG_FAILURES
if (logging&TYPE_MMAP) {
if (trigger_failure_logging) {
sprintf(log_buffer,"# M %d %d %p\n",
mmaps[i].size,
event_data[which].fd,
mmaps[i].addr);
write(log_fd,log_buffer,
strlen(log_buffer));
}
}
#endif
}
else {
active_mmaps++;
event_data[which].mmap=i;
mmaps[i].fd=event_data[which].fd;
if (logging&TYPE_MMAP) {
sprintf(log_buffer,"M %d %d %p\n",
mmaps[i].size,
event_data[which].fd,
mmaps[i].addr);
write(log_fd,log_buffer,strlen(log_buffer));
}
stats.mmap_successful++;
}
}
/* Randomly try to set up an aux mmap too */
if (rand()%4==0) {
setup_mmap_aux(which,i);
}
return 0;
}