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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2021 ARM Limited4 *5 * Verify that the ZA register context in signal frames is set up as6 * expected.7 */8 9#include <kselftest.h>10#include <signal.h>11#include <ucontext.h>12#include <sys/prctl.h>13 14#include "test_signals_utils.h"15#include "sve_helpers.h"16#include "testcases.h"17 18static union {19 ucontext_t uc;20 char buf[1024 * 128];21} context;22 23static bool sme_get_vls(struct tdescr *td)24{25 int res = sve_fill_vls(VLS_USE_SME, 1);26 27 if (!res)28 return true;29 30 if (res == KSFT_SKIP)31 td->result = KSFT_SKIP;32 33 return false;34}35 36static void setup_za_regs(void)37{38 /* smstart za; real data is TODO */39 asm volatile(".inst 0xd503457f" : : : );40}41 42static char zeros[ZA_SIG_REGS_SIZE(SVE_VQ_MAX)];43 44static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,45 unsigned int vl)46{47 size_t offset;48 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);49 struct za_context *za;50 51 fprintf(stderr, "Testing VL %d\n", vl);52 53 if (prctl(PR_SME_SET_VL, vl) != vl) {54 fprintf(stderr, "Failed to set VL\n");55 return 1;56 }57 58 /*59 * Get a signal context which should have a SVE frame and registers60 * in it.61 */62 setup_za_regs();63 if (!get_current_context(td, &context.uc, sizeof(context)))64 return 1;65 66 head = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context), &offset);67 if (!head) {68 fprintf(stderr, "No ZA context\n");69 return 1;70 }71 72 za = (struct za_context *)head;73 if (za->vl != vl) {74 fprintf(stderr, "Got VL %d, expected %d\n", za->vl, vl);75 return 1;76 }77 78 if (head->size != ZA_SIG_CONTEXT_SIZE(sve_vq_from_vl(vl))) {79 fprintf(stderr, "ZA context size %u, expected %lu\n",80 head->size, ZA_SIG_CONTEXT_SIZE(sve_vq_from_vl(vl)));81 return 1;82 }83 84 fprintf(stderr, "Got expected size %u and VL %d\n",85 head->size, za->vl);86 87 /* We didn't load any data into ZA so it should be all zeros */88 if (memcmp(zeros, (char *)za + ZA_SIG_REGS_OFFSET,89 ZA_SIG_REGS_SIZE(sve_vq_from_vl(za->vl))) != 0) {90 fprintf(stderr, "ZA data invalid\n");91 return 1;92 }93 94 return 0;95}96 97static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)98{99 int i;100 101 for (i = 0; i < nvls; i++) {102 if (do_one_sme_vl(td, si, uc, vls[i]))103 return 1;104 }105 106 td->pass = 1;107 108 return 0;109}110 111struct tdescr tde = {112 .name = "ZA register",113 .descr = "Check that we get the right ZA registers reported",114 .feats_required = FEAT_SME,115 .timeout = 3,116 .init = sme_get_vls,117 .run = sme_regs,118};119