1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2023 ARM Limited
4 *
5 * Verify that the FPMR register context in signal frames is set up as
6 * expected.
7 */
8
9 #include <signal.h>
10 #include <ucontext.h>
11 #include <sys/auxv.h>
12 #include <sys/prctl.h>
13 #include <unistd.h>
14 #include <asm/sigcontext.h>
15
16 #include "test_signals_utils.h"
17 #include "testcases.h"
18
19 static union {
20 ucontext_t uc;
21 char buf[1024 * 128];
22 } context;
23
24 #define SYS_FPMR "S3_3_C4_C4_2"
25
26 static uint64_t get_fpmr(void)
27 {
28 uint64_t val;
29
30 asm volatile (
31 "mrs %0, " SYS_FPMR "\n"
32 : "=r"(val)
33 :
34 : "cc");
35
36 return val;
37 }
38
39 int fpmr_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
40 {
41 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
42 struct fpmr_context *fpmr_ctx;
43 size_t offset;
44 bool in_sigframe;
45 bool have_fpmr;
46 __u64 orig_fpmr;
47
48 have_fpmr = getauxval(AT_HWCAP2) & HWCAP2_FPMR;
49 if (have_fpmr)
50 orig_fpmr = get_fpmr();
51
52 if (!get_current_context(td, &context.uc, sizeof(context)))
53 return 1;
54
55 fpmr_ctx = (struct fpmr_context *)
56 get_header(head, FPMR_MAGIC, td->live_sz, &offset);
57
58 in_sigframe = fpmr_ctx != NULL;
59
60 fprintf(stderr, "FPMR sigframe %s on system %s FPMR\n",
61 in_sigframe ? "present" : "absent",
62 have_fpmr ? "with" : "without");
63
64 td->pass = (in_sigframe == have_fpmr);
65
66 if (have_fpmr && fpmr_ctx) {
67 if (fpmr_ctx->fpmr != orig_fpmr) {
68 fprintf(stderr, "FPMR in frame is %llx, was %llx\n",
69 fpmr_ctx->fpmr, orig_fpmr);
70 td->pass = false;
71 }
72 }
73
74 return 0;
75 }
76
77 struct tdescr tde = {
78 .name = "FPMR",
79 .descr = "Validate that FPMR is present as expected",
80 .timeout = 3,
81 .run = fpmr_present,
82 };
83
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