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 <string.h>
27#include <signal.h>
28#include <unistd.h>
29
30#include <altivec.h>
31
32#include "utils.h"
33#include "tm.h"
34
35#define MAX_ATTEMPT 500000
36
37#define NV_VSX_REGS 12
38
39long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
40
41static sig_atomic_t fail;
42
43vector int vss[] = {
44	{1, 2, 3, 4 },{5, 6, 7, 8 },{9, 10,11,12},
45	{13,14,15,16},{17,18,19,20},{21,22,23,24},
46	{25,26,27,28},{29,30,31,32},{33,34,35,36},
47	{37,38,39,40},{41,42,43,44},{45,46,47,48},
48	{-1, -2, -3, -4 },{-5, -6, -7, -8 },{-9, -10,-11,-12},
49	{-13,-14,-15,-16},{-17,-18,-19,-20},{-21,-22,-23,-24},
50	{-25,-26,-27,-28},{-29,-30,-31,-32},{-33,-34,-35,-36},
51	{-37,-38,-39,-40},{-41,-42,-43,-44},{-45,-46,-47,-48}
52};
53
54static void signal_usr1(int signum, siginfo_t *info, void *uc)
55{
56	int i;
57	uint8_t vsc[sizeof(vector int)];
58	uint8_t vst[sizeof(vector int)];
59	ucontext_t *ucp = uc;
60	ucontext_t *tm_ucp = ucp->uc_link;
61
62	/*
63	 * The other half of the VSX regs will be after v_regs.
64	 *
65	 * In short, vmx_reserve array holds everything. v_regs is a 16
66	 * byte aligned pointer at the start of vmx_reserve (vmx_reserve
67	 * may or may not be 16 aligned) where the v_regs structure exists.
68	 * (half of) The VSX regsters are directly after v_regs so the
69	 * easiest way to find them below.
70	 */
71	long *vsx_ptr = (long *)(ucp->uc_mcontext.v_regs + 1);
72	long *tm_vsx_ptr = (long *)(tm_ucp->uc_mcontext.v_regs + 1);
73	for (i = 0; i < NV_VSX_REGS && !fail; i++) {
74		memcpy(vsc, &ucp->uc_mcontext.fp_regs[i + 20], 8);
75		memcpy(vsc + 8, &vsx_ptr[20 + i], 8);
76		fail = memcmp(vsc, &vss[i], sizeof(vector int));
77		memcpy(vst, &tm_ucp->uc_mcontext.fp_regs[i + 20], 8);
78		memcpy(vst + 8, &tm_vsx_ptr[20 + i], 8);
79		fail |= memcmp(vst, &vss[i + NV_VSX_REGS], sizeof(vector int));
80
81		if (fail) {
82			int j;
83
84			fprintf(stderr, "Failed on %d vsx 0x", i);
85			for (j = 0; j < 16; j++)
86				fprintf(stderr, "%02x", vsc[j]);
87			fprintf(stderr, " vs 0x");
88			for (j = 0; j < 16; j++)
89				fprintf(stderr, "%02x", vst[j]);
90			fprintf(stderr, "\n");
91		}
92	}
93}
94
95static int tm_signal_context_chk()
96{
97	struct sigaction act;
98	int i;
99	long rc;
100	pid_t pid = getpid();
101
102	SKIP_IF(!have_htm());
103
104	act.sa_sigaction = signal_usr1;
105	sigemptyset(&act.sa_mask);
106	act.sa_flags = SA_SIGINFO;
107	if (sigaction(SIGUSR1, &act, NULL) < 0) {
108		perror("sigaction sigusr1");
109		exit(1);
110	}
111
112	i = 0;
113	while (i < MAX_ATTEMPT && !fail) {
114		rc = tm_signal_self_context_load(pid, NULL, NULL, NULL, vss);
115		FAIL_IF(rc != pid);
116		i++;
117	}
118
119	return fail;
120}
121
122int main(void)
123{
124	return test_harness(tm_signal_context_chk, "tm_signal_context_chk_vsx");
125}
126