signal_tm.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright 2016, Cyril Bur, IBM Corp.
  4 *
  5 * Sending one self a signal should always get delivered.
  6 */
  7
  8#include <errno.h>
  9#include <stdlib.h>
 10#include <stdio.h>
 11#include <string.h>
 12#include <signal.h>
 13#include <unistd.h>
 14
 15#include <altivec.h>
 16
 17#include "utils.h"
 18#include "../tm/tm.h"
 19
 20#define MAX_ATTEMPT 500000
 21#define TIMEOUT 10
 22
 23extern long tm_signal_self(pid_t pid, int sig, long *ret);
 24
 25static sig_atomic_t signaled;
 26static sig_atomic_t fail;
 27
 28static void signal_handler(int sig)
 29{
 30	if (tcheck_active()) {
 31		fail = 2;
 32		return;
 33	}
 34
 35	if (sig == SIGUSR1)
 36		signaled = 1;
 37	else
 38		fail = 1;
 39}
 40
 41static int test_signal_tm()
 42{
 43	int i;
 44	struct sigaction act;
 45
 46	act.sa_handler = signal_handler;
 47	act.sa_flags = 0;
 48	sigemptyset(&act.sa_mask);
 49	if (sigaction(SIGUSR1, &act, NULL) < 0) {
 50		perror("sigaction SIGUSR1");
 51		exit(1);
 52	}
 53	if (sigaction(SIGALRM, &act, NULL) < 0) {
 54		perror("sigaction SIGALRM");
 55		exit(1);
 56	}
 57
 58	SKIP_IF(!have_htm());
 59	SKIP_IF(htm_is_synthetic());
 60
 61	for (i = 0; i < MAX_ATTEMPT; i++) {
 62		/*
 63		 * If anything bad happens in ASM and we fail to set ret
 64		 * because *handwave* TM this will cause failure
 65		 */
 66		long ret = 0xdead;
 67		long rc = 0xbeef;
 68
 69		alarm(0); /* Disable any pending */
 70		signaled = 0;
 71		alarm(TIMEOUT);
 72		FAIL_IF(tcheck_transactional());
 73		rc = tm_signal_self(getpid(), SIGUSR1, &ret);
 74		if (ret == 0xdead)
 75			/*
 76			 * This basically means the transaction aborted before we
 77			 * even got to the suspend... this is crazy but it
 78			 * happens.
 79			 * Yes this also means we might never make forward
 80			 * progress... the alarm() will trip eventually...
 81			 */
 82			continue;
 83
 84		if (rc || ret) {
 85			/* Ret is actually an errno */
 86			printf("TEXASR 0x%016lx, TFIAR 0x%016lx\n",
 87					__builtin_get_texasr(), __builtin_get_tfiar());
 88			fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
 89					i, fail, rc, ret);
 90			FAIL_IF(ret);
 91		}
 92		while(!signaled && !fail)
 93			asm volatile("": : :"memory");
 94		if (!signaled) {
 95			fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
 96					i, fail, rc, ret);
 97			FAIL_IF(fail); /* For the line number */
 98		}
 99	}
100
101	return 0;
102}
103
104int main(void)
105{
106	return test_harness(test_signal_tm, "signal_tm");
107}