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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2023 ARM Limited
*
* Verify that the FPMR register context in signal frames is set up as
* expected.
*/
#include <signal.h>
#include <ucontext.h>
#include <sys/auxv.h>
#include <sys/prctl.h>
#include <unistd.h>
#include <asm/sigcontext.h>
#include "test_signals_utils.h"
#include "testcases.h"
static union {
ucontext_t uc;
char buf[1024 * 128];
} context;
#define SYS_FPMR "S3_3_C4_C4_2"
static uint64_t get_fpmr(void)
{
uint64_t val;
asm volatile (
"mrs %0, " SYS_FPMR "\n"
: "=r"(val)
:
: "cc");
return val;
}
int fpmr_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
{
struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
struct fpmr_context *fpmr_ctx;
size_t offset;
bool in_sigframe;
bool have_fpmr;
__u64 orig_fpmr;
have_fpmr = getauxval(AT_HWCAP2) & HWCAP2_FPMR;
if (have_fpmr)
orig_fpmr = get_fpmr();
if (!get_current_context(td, &context.uc, sizeof(context)))
return 1;
fpmr_ctx = (struct fpmr_context *)
get_header(head, FPMR_MAGIC, td->live_sz, &offset);
in_sigframe = fpmr_ctx != NULL;
fprintf(stderr, "FPMR sigframe %s on system %s FPMR\n",
in_sigframe ? "present" : "absent",
have_fpmr ? "with" : "without");
td->pass = (in_sigframe == have_fpmr);
if (have_fpmr && fpmr_ctx) {
if (fpmr_ctx->fpmr != orig_fpmr) {
fprintf(stderr, "FPMR in frame is %llx, was %llx\n",
fpmr_ctx->fpmr, orig_fpmr);
td->pass = false;
}
}
return 0;
}
struct tdescr tde = {
.name = "FPMR",
.descr = "Validate that FPMR is present as expected",
.timeout = 3,
.run = fpmr_present,
};
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