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

   1/*
   2 * Copyright 2016, Cyril Bur, IBM Corp.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * as published by the Free Software Foundation; either version
   7 * 2 of the License, or (at your option) any later version.
   8 *
   9 * Sending one self a signal should always get delivered.
  10 */
  11
  12#include <errno.h>
  13#include <stdlib.h>
  14#include <stdio.h>
  15#include <string.h>
  16#include <signal.h>
  17#include <unistd.h>
  18
  19#include <altivec.h>
  20
  21#include "utils.h"
  22#include "../tm/tm.h"
  23
  24#define MAX_ATTEMPT 500000
  25#define TIMEOUT 10
  26
  27extern long tm_signal_self(pid_t pid, int sig, long *ret);
  28
  29static sig_atomic_t signaled;
  30static sig_atomic_t fail;
  31
  32static void signal_handler(int sig)
  33{
  34        if (tcheck_active()) {
  35                fail = 2;
  36                return;
  37        }
  38
  39        if (sig == SIGUSR1)
  40                signaled = 1;
  41        else
  42                fail = 1;
  43}
  44
  45static int test_signal_tm()
  46{
  47        int i;
  48        struct sigaction act;
  49
  50        act.sa_handler = signal_handler;
  51        act.sa_flags = 0;
  52        sigemptyset(&act.sa_mask);
  53        if (sigaction(SIGUSR1, &act, NULL) < 0) {
  54                perror("sigaction SIGUSR1");
  55                exit(1);
  56        }
  57        if (sigaction(SIGALRM, &act, NULL) < 0) {
  58                perror("sigaction SIGALRM");
  59                exit(1);
  60        }
  61
  62        SKIP_IF(!have_htm());
  63
  64        for (i = 0; i < MAX_ATTEMPT; i++) {
  65                /*
  66                 * If anything bad happens in ASM and we fail to set ret
  67                 * because *handwave* TM this will cause failure
  68                 */
  69                long ret = 0xdead;
  70                long rc = 0xbeef;
  71
  72                alarm(0); /* Disable any pending */
  73                signaled = 0;
  74                alarm(TIMEOUT);
  75                FAIL_IF(tcheck_transactional());
  76                rc = tm_signal_self(getpid(), SIGUSR1, &ret);
  77                if (ret == 0xdead)
  78                        /*
  79                         * This basically means the transaction aborted before we
  80                         * even got to the suspend... this is crazy but it
  81                         * happens.
  82                         * Yes this also means we might never make forward
  83                         * progress... the alarm() will trip eventually...
  84                         */
  85                        continue;
  86
  87                if (rc || ret) {
  88                        /* Ret is actually an errno */
  89                        printf("TEXASR 0x%016lx, TFIAR 0x%016lx\n",
  90                                        __builtin_get_texasr(), __builtin_get_tfiar());
  91                        fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
  92                                        i, fail, rc, ret);
  93                        FAIL_IF(ret);
  94                }
  95                while(!signaled && !fail)
  96                        asm volatile("": : :"memory");
  97                if (!signaled) {
  98                        fprintf(stderr, "(%d) Fail reason: %d rc=0x%lx ret=0x%lx\n",
  99                                        i, fail, rc, ret);
 100                        FAIL_IF(fail); /* For the line number */
 101                }
 102        }
 103
 104        return 0;
 105}
 106
 107int main(void)
 108{
 109        return test_harness(test_signal_tm, "signal_tm");
 110}
 111