1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright 2023 Oxide Computer Company
14 */
15
16 /*
17 * This test goes through and verifies that the FPU contents are properly
18 * restored with a setcontext call.
19 */
20
21 #include <err.h>
22 #include <stdlib.h>
23 #include <ucontext.h>
24 #include <limits.h>
25
26 #include "xsave_util.h"
27
28 xsu_fpu_t init_set, override, found;
29 volatile int exit_status = EXIT_SUCCESS;
30
31 static void
setcontext_restore_check(uint32_t hwsup)32 setcontext_restore_check(uint32_t hwsup)
33 {
34 xsu_getfpu(&found, hwsup);
35 if (xsu_same(&init_set, &found, hwsup)) {
36 (void) printf("TEST PASSED: setcontext() correctly restored "
37 "clobbered FPU contents\n");
38 exit(exit_status);
39 } else {
40 errx(EXIT_FAILURE, "TEST_FAILED: setcontext() did not properly "
41 "restore clobbered FPU contents");
42 }
43 }
44
45 int
main(void)46 main(void)
47 {
48 ucontext_t *ctx;
49 uint32_t start = arc4random();
50 uint32_t hwsup = xsu_hwsupport();
51
52 ctx = ucontext_alloc(0);
53 if (ctx == NULL) {
54 err(EXIT_FAILURE, "failed to get allocate ucontext_t");
55 }
56 (void) printf("filling starting at 0x%x\n", start);
57 xsu_fill(&init_set, hwsup, start);
58 xsu_fill(&override, hwsup, start + INT_MAX);
59 xsu_setfpu(&init_set, hwsup);
60
61 if (getcontext_extd(ctx, 0) != 0) {
62 err(EXIT_FAILURE, "failed to get extended context");
63 }
64
65 xsu_ustack_alloc(ctx);
66 makecontext(ctx, setcontext_restore_check, 1, hwsup);
67 xsu_setfpu(&override, hwsup);
68 xsu_getfpu(&found, hwsup);
69 if (!xsu_same(&override, &found, hwsup)) {
70 warnx("TEST FAILED: override FPU data not found!");
71 exit_status = EXIT_FAILURE;
72 }
73 (void) setcontext(ctx);
74
75 err(EXIT_FAILURE, "TEST FAILED: set context did not work!");
76 }
77