LXR linux/tools/testing/selftests/powerpc/signal/signal

   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
  60        for (i = 0; i < MAX_ATTEMPT; i++) {
  61                /*
  62                 * If anything bad happens in ASM and we fail to set ret
  63                 * because *handwave* TM this will cause failure
  64                 */
  65                long ret = 0xdead;
  66                long rc = 0xbeef;
  67
  68                alarm(0); /* Disable any pending */
  69                signaled = 0;
  70                alarm(TIMEOUT);
  71                FAIL_IF(tcheck_transactional());
  72                rc = tm_signal_self(getpid(), SIGUSR1, &ret);
  73                if (ret == 0xdead)
  74                        /*
  75                         * This basically means the transaction aborted before we
  76                         * even got to the suspend... this is crazy but it
  77                         * happens.
  78                         * Yes this also means we might never make forward
  79                         * progress... the alarm() will trip eventually...
  80                         */
  81                        continue;
  82
  83                if (rc || ret) {
  84                        /* Ret is actually an errno */
  85                        printf("TEXASR 0x%016lx, TFIAR 0x%016lx\n",
  86                                        __builtin_get_texasr(), __builtin_get_tfiar());
  87                        fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
  88                                        i, fail, rc, ret);
  89                        FAIL_IF(ret);
  90                }
  91                while(!signaled && !fail)
  92                        asm volatile("": : :"memory");
  93                if (!signaled) {
  94                        fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
  95                                        i, fail, rc, ret);
  96                        FAIL_IF(fail); /* For the line number */
  97                }
  98        }
  99
 100        return 0;
 101}
 102
 103int main(void)
 104{
 105        return test_harness(test_signal_tm, "signal_tm");
 106}
 107