/* * 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 VMX registers are correctly reported in a * signal context. Each worker just spins checking its VMX registers, at some * point a signal will interrupt it and C code will check the signal context * ensuring it is also the same. */ #include #include #include #include #include #include #include #include #include #include #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 vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12}, {13,14,15,16},{17,18,19,20},{21,22,23,24}, {25,26,27,28},{29,30,31,32},{33,34,35,36}, {37,38,39,40},{41,42,43,44},{45,46,47,48}}; bool bad_context; int running; int threads_starting; extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal); void signal_vmx_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 = 20; i < 32; i++) { if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) { int j; /* * Shouldn't printf() in a signal handler, however, this is a * test and we've detected failure. Understanding what failed * is paramount. All that happens after this is tests exit with * failure. */ printf("VMX mismatch at reg %d!\n", i); printf("Reg | Actual | Expected\n"); for (j = 20; j < 32; j++) { printf("%d | 0x%04x%04x%04x%04x | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0], mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3], varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]); } bad_context = true; break; } } } void *signal_vmx_c(void *p) { int i, j; long rc; struct sigaction act; act.sa_sigaction = signal_vmx_sig; act.sa_flags = SA_SIGINFO; rc = sigaction(SIGUSR1, &act, NULL); if (rc) return p; srand(pthread_self()); for (i = 0; i < 12; i++) for (j = 0; j < 4; j++) varray[i][j] = rand(); rc = preempt_vmx(varray, &threads_starting, &running); return (void *) rc; } int test_signal_vmx(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_vmx_c, NULL); FAIL_IF(rc); } setbuf(stdout, NULL); printf("\tWaiting for %d workers to start... %d", threads, threads_starting); while (threads_starting) { asm volatile("": : :"memory"); usleep(1000); printf(", %d", threads_starting); } 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("\tKilling 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_vmx * 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_vmx, "vmx_signal"); } /Makefile
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