1 /*
2 * Copyright 2015, 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 * This test attempts to see if the VMX registers are correctly reported in a
10 * signal context. Each worker just spins checking its VMX registers, at some
11 * point a signal will interrupt it and C code will check the signal context
12 * ensuring it is also the same.
13 */
14
15 #include <stdio.h>
16 #include <unistd.h>
17 #include <sys/syscall.h>
18 #include <sys/time.h>
19 #include <sys/types.h>
20 #include <sys/wait.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <pthread.h>
24 #include <altivec.h>
25
26 #include "utils.h"
27
28 /* Number of times each thread should receive the signal */
29 #define ITERATIONS 10
30 /*
31 * Factor by which to multiply number of online CPUs for total number of
32 * worker threads
33 */
34 #define THREAD_FACTOR 8
35
36 __thread vector int varray[] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10,11,12},
37 {13,14,15,16},{17,18,19,20},{21,22,23,24},
38 {25,26,27,28},{29,30,31,32},{33,34,35,36},
39 {37,38,39,40},{41,42,43,44},{45,46,47,48}};
40
41 bool bad_context;
42 int running;
43 int threads_starting;
44
45 extern int preempt_vmx(vector int *varray, int *threads_starting, int *sentinal);
46
signal_vmx_sig(int sig,siginfo_t * info,void * context)47 void signal_vmx_sig(int sig, siginfo_t *info, void *context)
48 {
49 int i;
50 ucontext_t *uc = context;
51 mcontext_t *mc = &uc->uc_mcontext;
52
53 /* Only the non volatiles were loaded up */
54 for (i = 20; i < 32; i++) {
55 if (memcmp(mc->v_regs->vrregs[i], &varray[i - 20], 16)) {
56 int j;
57 /*
58 * Shouldn't printf() in a signal handler, however, this is a
59 * test and we've detected failure. Understanding what failed
60 * is paramount. All that happens after this is tests exit with
61 * failure.
62 */
63 printf("VMX mismatch at reg %d!\n", i);
64 printf("Reg | Actual | Expected\n");
65 for (j = 20; j < 32; j++) {
66 printf("%d | 0x%04x%04x%04x%04x | 0x%04x%04x%04x%04x\n", j, mc->v_regs->vrregs[j][0],
67 mc->v_regs->vrregs[j][1], mc->v_regs->vrregs[j][2], mc->v_regs->vrregs[j][3],
68 varray[j - 20][0], varray[j - 20][1], varray[j - 20][2], varray[j - 20][3]);
69 }
70 bad_context = true;
71 break;
72 }
73 }
74 }
75
signal_vmx_c(void * p)76 void *signal_vmx_c(void *p)
77 {
78 int i, j;
79 long rc;
80 struct sigaction act;
81 act.sa_sigaction = signal_vmx_sig;
82 act.sa_flags = SA_SIGINFO;
83 rc = sigaction(SIGUSR1, &act, NULL);
84 if (rc)
85 return p;
86
87 srand(pthread_self());
88 for (i = 0; i < 12; i++)
89 for (j = 0; j < 4; j++)
90 varray[i][j] = rand();
91
92 rc = preempt_vmx(varray, &threads_starting, &running);
93
94 return (void *) rc;
95 }
96
test_signal_vmx(void)97 int test_signal_vmx(void)
98 {
99 int i, j, rc, threads;
100 void *rc_p;
101 pthread_t *tids;
102
103 threads = sysconf(_SC_NPROCESSORS_ONLN) * THREAD_FACTOR;
104 tids = malloc(threads * sizeof(pthread_t));
105 FAIL_IF(!tids);
106
107 running = true;
108 threads_starting = threads;
109 for (i = 0; i < threads; i++) {
110 rc = pthread_create(&tids[i], NULL, signal_vmx_c, NULL);
111 FAIL_IF(rc);
112 }
113
114 setbuf(stdout, NULL);
115 printf("\tWaiting for %d workers to start... %d", threads, threads_starting);
116 while (threads_starting) {
117 asm volatile("": : :"memory");
118 usleep(1000);
119 printf(", %d", threads_starting);
120 }
121 printf(" ...done\n");
122
123 printf("\tSending signals to all threads %d times...", ITERATIONS);
124 for (i = 0; i < ITERATIONS; i++) {
125 for (j = 0; j < threads; j++) {
126 pthread_kill(tids[j], SIGUSR1);
127 }
128 sleep(1);
129 }
130 printf("done\n");
131
132 printf("\tKilling workers...");
133 running = 0;
134 for (i = 0; i < threads; i++) {
135 pthread_join(tids[i], &rc_p);
136
137 /*
138 * Harness will say the fail was here, look at why signal_vmx
139 * returned
140 */
141 if ((long) rc_p || bad_context)
142 printf("oops\n");
143 if (bad_context)
144 fprintf(stderr, "\t!! bad_context is true\n");
145 FAIL_IF((long) rc_p || bad_context);
146 }
147 printf("done\n");
148
149 free(tids);
150 return 0;
151 }
152
main(int argc,char * argv[])153 int main(int argc, char *argv[])
154 {
155 return test_harness(test_signal_vmx, "vmx_signal");
156 }
157