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
19static union {
20	ucontext_t uc;
21	char buf[1024 * 128];
22} context;
23
24#define SYS_FPMR "S3_3_C4_C4_2"
25
26static 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
39int 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
77struct tdescr tde = {
78	.name = "FPMR",
79	.descr = "Validate that FPMR is present as expected",
80	.timeout = 3,
81	.run = fpmr_present,
82};