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
27 void 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
52 int tm_sigreturn(void)
53 {
54 struct sigaction sa;
55 uint64_t ret = 0;
56
57 SKIP_IF(!have_htm());
58 SKIP_IF(!is_ppc64le());
59
60 memset(&sa, 0, sizeof(sa));
61 sa.sa_handler = handler;
62 sigemptyset(&sa.sa_mask);
63
64 if (sigaction(SIGSEGV, &sa, NULL))
65 exit(1);
66
67 asm __volatile__(
68 "tbegin. ;"
69 "beq 1f ;"
70 "li 3,0 ;"
71 "std 3,0(3) ;" /* trigger SEGV */
72 "li 3,1 ;"
73 "std%X[ret] 3,%[ret] ;"
74 "tend. ;"
75 "b 2f ;"
76 "1: ;"
77 "li 3,2 ;"
78 "std%X[ret] 3,%[ret] ;"
79 "2: ;"
80 : [ret] "=m"(ret)
81 :
82 : "memory", "3", "cr0");
83
84 if (ret != 2)
85 exit(1);
86
87 exit(0);
88 }
89
90 int main(void)
91 {
92 return test_harness(tm_sigreturn, "tm_sigreturn");
93 }