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 
51