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 <stdlib.h>
14 #include <signal.h>
15 
16 #include "utils.h"
17 
18 void trap_signal_handler(int signo, siginfo_t *si, void *uc)
19 {
20 	ucontext_t *ucp = (ucontext_t *) uc;
21 
22 	asm("tbegin.; tsuspend.;");
23 
24 	/* Skip 'trap' instruction if it succeed */
25 	ucp->uc_mcontext.regs->nip += 4;
26 }
27 
28 int tm_signal_sigreturn_nt(void)
29 {
30 	struct sigaction trap_sa;
31 
32 	trap_sa.sa_flags = SA_SIGINFO;
33 	trap_sa.sa_sigaction = trap_signal_handler;
34 
35 	sigaction(SIGTRAP, &trap_sa, NULL);
36 
37 	raise(SIGTRAP);
38 
39 	return EXIT_SUCCESS;
40 }
41 
42 int main(int argc, char **argv)
43 {
44 	test_harness(tm_signal_sigreturn_nt, "tm_signal_sigreturn_nt");
45 }
46 
47