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