Commit 5262b216 authored by Mark Brown's avatar Mark Brown Committed by Catalin Marinas
Browse files

kselftest/arm64: signal: Add test case for SVE register state in signals 



Currently this doesn't actually verify that the register contents do the
right thing, it just verifes that a SVE context with appropriate size
appears.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210819134245.13935-6-broonie@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent d25ac50c

tools/testing/selftests/arm64/signal/testcases/sve_regs.c

0 → 100644
+126 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2021 ARM Limited

 *

 * Verify that the SVE register context in signal frames is set up as

 * expected.

 */



#include <signal.h>

#include <ucontext.h>

#include <sys/prctl.h>



#include "test_signals_utils.h"

#include "testcases.h"



struct fake_sigframe sf;

static unsigned int vls[SVE_VQ_MAX];

unsigned int nvls = 0;



static bool sve_get_vls(struct tdescr *td)

{

	int vq, vl;



	/*

	 * Enumerate up to SVE_VQ_MAX vector lengths

	 */

	for (vq = SVE_VQ_MAX; vq > 0; --vq) {

		vl = prctl(PR_SVE_SET_VL, vq * 16);

		if (vl == -1)

			return false;



		vl &= PR_SVE_VL_LEN_MASK;



		/* Skip missing VLs */

		vq = sve_vq_from_vl(vl);



		vls[nvls++] = vl;

	}



	/* We need at least one VL */

	if (nvls < 1) {

		fprintf(stderr, "Only %d VL supported\n", nvls);

		return false;

	}



	return true;

}



static void setup_sve_regs(void)

{

	/* RDVL x16, #1 so we should have SVE regs; real data is TODO */

	asm volatile(".inst 0x04bf5030" : : : "x16" );

}



static int do_one_sve_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,

			 unsigned int vl)

{

	size_t resv_sz, offset;

	struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf);

	struct sve_context *sve;



	fprintf(stderr, "Testing VL %d\n", vl);



	if (prctl(PR_SVE_SET_VL, vl) == -1) {

		fprintf(stderr, "Failed to set VL\n");

		return 1;

	}



	/*

	 * Get a signal context which should have a SVE frame and registers

	 * in it.

	 */

	setup_sve_regs();

	if (!get_current_context(td, &sf.uc))

		return 1;



	resv_sz = GET_SF_RESV_SIZE(sf);

	head = get_header(head, SVE_MAGIC, resv_sz, &offset);

	if (!head) {

		fprintf(stderr, "No SVE context\n");

		return 1;

	}



	sve = (struct sve_context *)head;

	if (sve->vl != vl) {

		fprintf(stderr, "Got VL %d, expected %d\n", sve->vl, vl);

		return 1;

	}



	/* The actual size validation is done in get_current_context() */

	fprintf(stderr, "Got expected size %u and VL %d\n",

		head->size, sve->vl);



	return 0;

}



static int sve_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)

{

	int i;



	for (i = 0; i < nvls; i++) {

		/*

		 * TODO: the signal test helpers can't currently cope

		 * with signal frames bigger than struct sigcontext,

		 * skip VLs that will trigger that.

		 */

		if (vls[i] > 64)

			continue;



		if (do_one_sve_vl(td, si, uc, vls[i]))

			return 1;

	}



	td->pass = 1;



	return 0;

}



struct tdescr tde = {

	.name = "SVE registers",

	.descr = "Check that we get the right SVE registers reported",

	.feats_required = FEAT_SVE,

	.timeout = 3,

	.init = sve_get_vls,

	.run = sve_regs,

};