mirror of https://gitee.com/openkylin/linux.git
136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
|
|
* Copyright 2015, Cyril Bur, IBM Corp.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This test attempts to see if the FPU registers are correctly reported in a
|
|
* signal context. Each worker just spins checking its FPU registers, at some
|
|
* point a signal will interrupt it and C code will check the signal context
|
|
* ensuring it is also the same.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <stdlib.h>
|
|
#include <pthread.h>
|
|
|
|
#include "utils.h"
|
|
|
|
/* Number of times each thread should receive the signal */
|
|
#define ITERATIONS 10
|
|
/*
|
|
* Factor by which to multiply number of online CPUs for total number of
|
|
* worker threads
|
|
*/
|
|
#define THREAD_FACTOR 8
|
|
|
|
__thread double darray[] = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0,
|
|
1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0,
|
|
2.1};
|
|
|
|
bool bad_context;
|
|
int threads_starting;
|
|
int running;
|
|
|
|
extern long preempt_fpu(double *darray, int *threads_starting, int *running);
|
|
|
|
void signal_fpu_sig(int sig, siginfo_t *info, void *context)
|
|
{
|
|
int i;
|
|
ucontext_t *uc = context;
|
|
mcontext_t *mc = &uc->uc_mcontext;
|
|
|
|
/* Only the non volatiles were loaded up */
|
|
for (i = 14; i < 32; i++) {
|
|
if (mc->fp_regs[i] != darray[i - 14]) {
|
|
bad_context = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void *signal_fpu_c(void *p)
|
|
{
|
|
int i;
|
|
long rc;
|
|
struct sigaction act;
|
|
act.sa_sigaction = signal_fpu_sig;
|
|
act.sa_flags = SA_SIGINFO;
|
|
rc = sigaction(SIGUSR1, &act, NULL);
|
|
if (rc)
|
|
return p;
|
|
|
|
srand(pthread_self());
|
|
for (i = 0; i < 21; i++)
|
|
darray[i] = rand();
|
|
|
|
rc = preempt_fpu(darray, &threads_starting, &running);
|
|
|
|
return (void *) rc;
|
|
}
|
|
|
|
int test_signal_fpu(void)
|
|
{
|
|
int i, j, rc, threads;
|
|
void *rc_p;
|
|
pthread_t *tids;
|
|
|
|
threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
|
|
tids = malloc(threads * sizeof(pthread_t));
|
|
FAIL_IF(!tids);
|
|
|
|
running = true;
|
|
threads_starting = threads;
|
|
for (i = 0; i < threads; i++) {
|
|
rc = pthread_create(&tids[i], NULL, signal_fpu_c, NULL);
|
|
FAIL_IF(rc);
|
|
}
|
|
|
|
setbuf(stdout, NULL);
|
|
printf("\tWaiting for all workers to start...");
|
|
while (threads_starting)
|
|
asm volatile("": : :"memory");
|
|
printf("done\n");
|
|
|
|
printf("\tSending signals to all threads %d times...", ITERATIONS);
|
|
for (i = 0; i < ITERATIONS; i++) {
|
|
for (j = 0; j < threads; j++) {
|
|
pthread_kill(tids[j], SIGUSR1);
|
|
}
|
|
sleep(1);
|
|
}
|
|
printf("done\n");
|
|
|
|
printf("\tStopping workers...");
|
|
running = 0;
|
|
for (i = 0; i < threads; i++) {
|
|
pthread_join(tids[i], &rc_p);
|
|
|
|
/*
|
|
* Harness will say the fail was here, look at why signal_fpu
|
|
* returned
|
|
*/
|
|
if ((long) rc_p || bad_context)
|
|
printf("oops\n");
|
|
if (bad_context)
|
|
fprintf(stderr, "\t!! bad_context is true\n");
|
|
FAIL_IF((long) rc_p || bad_context);
|
|
}
|
|
printf("done\n");
|
|
|
|
free(tids);
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
return test_harness(test_signal_fpu, "fpu_signal");
|
|
}
|