1// SPDX-License-Identifier: GPL-2.0
2
3/*
4 * Copyright 2015, Laurent Dufour, IBM Corp.
5 *
6 * Test the kernel's signal returning code to check reclaim is done if the
7 * sigreturn() is called while in a transaction (suspended since active is
8 * already dropped trough the system call path).
9 *
10 * The kernel must discard the transaction when entering sigreturn, since
11 * restoring the potential TM SPRS from the signal frame is requiring to not be
12 * in a transaction.
13 */
14
15#include <signal.h>
16#include <stdio.h>
17#include <stdlib.h>
18#include <string.h>
19#include <sys/types.h>
20#include <sys/wait.h>
21#include <unistd.h>
22
23#include "tm.h"
24#include "utils.h"
25
26
27void handler(int sig)
28{
29	uint64_t ret;
30
31	asm __volatile__(
32		"li             3,1             ;"
33		"tbegin.                        ;"
34		"beq            1f              ;"
35		"li             3,0             ;"
36		"tsuspend.                      ;"
37		"1:                             ;"
38		"std%X[ret]     3, %[ret]       ;"
39		: [ret] "=m"(ret)
40		:
41		: "memory", "3", "cr0");
42
43	if (ret)
44		exit(1);
45
46	/*
47	 * We return from the signal handle while in a suspended transaction
48	 */
49}
50
51
52int tm_sigreturn(void)
53{
54	struct sigaction sa;
55	uint64_t ret = 0;
56
57	SKIP_IF(!have_htm());
58	SKIP_IF(htm_is_synthetic());
59	SKIP_IF(!is_ppc64le());
60
61	memset(&sa, 0, sizeof(sa));
62	sa.sa_handler = handler;
63	sigemptyset(&sa.sa_mask);
64
65	if (sigaction(SIGSEGV, &sa, NULL))
66		exit(1);
67
68	asm __volatile__(
69		"tbegin.                        ;"
70		"beq            1f              ;"
71		"li             3,0             ;"
72		"std            3,0(3)          ;" /* trigger SEGV */
73		"li             3,1             ;"
74		"std%X[ret]     3,%[ret]        ;"
75		"tend.                          ;"
76		"b              2f              ;"
77		"1:                             ;"
78		"li             3,2             ;"
79		"std%X[ret]     3,%[ret]        ;"
80		"2:                             ;"
81		: [ret] "=m"(ret)
82		:
83		: "memory", "3", "cr0");
84
85	if (ret != 2)
86		exit(1);
87
88	exit(0);
89}
90
91int main(void)
92{
93	return test_harness(tm_sigreturn, "tm_sigreturn");
94}
95