tools/testing/selftests/powerpc/signal/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
  23 extern long tm_signal_self(pid_t pid, int sig, long *ret);
  24
  25 static sig_atomic_t signaled;
  26 static sig_atomic_t fail;
  27
  28 static 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
  41 static 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
 103 int main(void)
 104 {
 105         return test_harness(test_signal_tm, "signal_tm");
 106 }