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

   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
  20void 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
  30int tm_signal_sigreturn_nt(void)
  31{
  32        struct sigaction trap_sa;
  33
  34        SKIP_IF(!have_htm());
  35        SKIP_IF(htm_is_synthetic());
  36
  37        trap_sa.sa_flags = SA_SIGINFO;
  38        trap_sa.sa_sigaction = trap_signal_handler;
  39
  40        sigaction(SIGTRAP, &trap_sa, NULL);
  41
  42        raise(SIGTRAP);
  43
  44        return EXIT_SUCCESS;
  45}
  46
  47int main(int argc, char **argv)
  48{
  49        test_harness(tm_signal_sigreturn_nt, "tm_signal_sigreturn_nt");
  50}
  51
  52