tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright 2016, Cyril Bur, IBM Corp.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 *
10 * Test the kernel's signal frame code.
11 *
12 * The kernel sets up two sets of ucontexts if the signal was to be
13 * delivered while the thread was in a transaction.
14 * Expected behaviour is that the checkpointed state is in the user
15 * context passed to the signal handler. The speculated state can be
16 * accessed with the uc_link pointer.
17 *
18 * The rationale for this is that if TM unaware code (which linked
19 * against TM libs) installs a signal handler it will not know of the
20 * speculative nature of the 'live' registers and may infer the wrong
21 * thing.
22 */
23
24#include <stdlib.h>
25#include <stdio.h>
26#include <signal.h>
27#include <unistd.h>
28
29#include <altivec.h>
30
31#include "utils.h"
32#include "tm.h"
33
34#define MAX_ATTEMPT 500000
35
36#define NV_GPR_REGS 18
37
38long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
39
40static sig_atomic_t fail;
41
42static long gps[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
43 -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18};
44
45static void signal_usr1(int signum, siginfo_t *info, void *uc)
46{
47 int i;
48 ucontext_t *ucp = uc;
49 ucontext_t *tm_ucp = ucp->uc_link;
50
51 for (i = 0; i < NV_GPR_REGS && !fail; i++) {
52 fail = (ucp->uc_mcontext.gp_regs[i + 14] != gps[i]);
53 fail |= (tm_ucp->uc_mcontext.gp_regs[i + 14] != gps[i + NV_GPR_REGS]);
54 if (fail)
55 printf("Failed on %d GPR %lu or %lu\n", i,
56 ucp->uc_mcontext.gp_regs[i + 14], tm_ucp->uc_mcontext.gp_regs[i + 14]);
57 }
58}
59
60static int tm_signal_context_chk_gpr()
61{
62 struct sigaction act;
63 int i;
64 long rc;
65 pid_t pid = getpid();
66
67 SKIP_IF(!have_htm());
68
69 act.sa_sigaction = signal_usr1;
70 sigemptyset(&act.sa_mask);
71 act.sa_flags = SA_SIGINFO;
72 if (sigaction(SIGUSR1, &act, NULL) < 0) {
73 perror("sigaction sigusr1");
74 exit(1);
75 }
76
77 i = 0;
78 while (i < MAX_ATTEMPT && !fail) {
79 rc = tm_signal_self_context_load(pid, gps, NULL, NULL, NULL);
80 FAIL_IF(rc != pid);
81 i++;
82 }
83
84 return fail;
85}
86
87int main(void)
88{
89 return test_harness(tm_signal_context_chk_gpr, "tm_signal_context_chk_gpr");
90}