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kernel
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linux
kselftest/arm64: Add basic FPMR test
Verify that a FPMR frame is generated on systems that support FPMR and not
generated otherwise.
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240306-arm64-2023-dpisa-v5-8-c568edc8ed7f@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
authored by
Mark Brown
and committed by
Catalin Marinas
7bcebadd
f4dcccdd
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tools/testing/selftests/arm64/signal/.gitignore
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tools/testing/selftests/arm64/signal/.gitignore
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tools/testing/selftests/arm64/signal/testcases/fpmr_siginfo.c
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tools/testing/selftests/arm64/signal/testcases/fpmr_siginfo.c
···
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2023 ARM Limited
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*
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* Verify that the FPMR register context in signal frames is set up as
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* expected.
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*/
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#include <signal.h>
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#include <ucontext.h>
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#include <sys/auxv.h>
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#include <sys/prctl.h>
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#include <unistd.h>
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#include <asm/sigcontext.h>
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#include "test_signals_utils.h"
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#include "testcases.h"
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static union {
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ucontext_t uc;
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char buf[1024 * 128];
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} context;
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#define SYS_FPMR "S3_3_C4_C4_2"
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static uint64_t get_fpmr(void)
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{
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uint64_t val;
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asm volatile (
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"mrs %0, " SYS_FPMR "\n"
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: "=r"(val)
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:
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: "cc");
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return val;
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}
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int fpmr_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
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{
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struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
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struct fpmr_context *fpmr_ctx;
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size_t offset;
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bool in_sigframe;
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bool have_fpmr;
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__u64 orig_fpmr;
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have_fpmr = getauxval(AT_HWCAP2) & HWCAP2_FPMR;
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if (have_fpmr)
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orig_fpmr = get_fpmr();
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if (!get_current_context(td, &context.uc, sizeof(context)))
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return 1;
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fpmr_ctx = (struct fpmr_context *)
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get_header(head, FPMR_MAGIC, td->live_sz, &offset);
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in_sigframe = fpmr_ctx != NULL;
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fprintf(stderr, "FPMR sigframe %s on system %s FPMR\n",
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in_sigframe ? "present" : "absent",
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have_fpmr ? "with" : "without");
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td->pass = (in_sigframe == have_fpmr);
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if (have_fpmr && fpmr_ctx) {
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if (fpmr_ctx->fpmr != orig_fpmr) {
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fprintf(stderr, "FPMR in frame is %llx, was %llx\n",
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fpmr_ctx->fpmr, orig_fpmr);
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td->pass = false;
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}
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}
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return 0;
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}
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struct tdescr tde = {
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.name = "FPMR",
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.descr = "Validate that FPMR is present as expected",
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.timeout = 3,
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.run = fpmr_present,
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};