root/tools/testing/selftests/powerpc/tm/tm-signal-sigreturn-nt.c

DEFINITIONS

1. trap_signal_handler
2. tm_signal_sigreturn_nt
3. main

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2018, Breno Leitao, Gustavo Romero, IBM Corp.
   4  *
   5  * A test case that creates a signal and starts a suspended transaction
   6  * inside the signal handler.
   7  *
   8  * It returns from the signal handler with the CPU at suspended state, but
   9  * without setting usercontext MSR Transaction State (TS) fields.
  10  */
  11 
  12 #define _GNU_SOURCE
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <signal.h>
  16 
  17 #include "utils.h"
  18 #include "tm.h"
  19 
  20 void trap_signal_handler(int signo, siginfo_t *si, void *uc)
  21 {
  22         ucontext_t *ucp = (ucontext_t *) uc;
  23 
  24         asm("tbegin.; tsuspend.;");
  25 
  26         /* Skip 'trap' instruction if it succeed */
  27         ucp->uc_mcontext.regs->nip += 4;
  28 }
  29 
  30 int tm_signal_sigreturn_nt(void)
  31 {
  32         struct sigaction trap_sa;
  33 
  34         SKIP_IF(!have_htm());
  35 
  36         trap_sa.sa_flags = SA_SIGINFO;
  37         trap_sa.sa_sigaction = trap_signal_handler;
  38 
  39         sigaction(SIGTRAP, &trap_sa, NULL);
  40 
  41         raise(SIGTRAP);
  42 
  43         return EXIT_SUCCESS;
  44 }
  45 
  46 int main(int argc, char **argv)
  47 {
  48         test_harness(tm_signal_sigreturn_nt, "tm_signal_sigreturn_nt");
  49 }
  50