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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2021 ARM Limited4 *5 * Verify that the SVE 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 * 64];21} context;22 23static bool sve_get_vls(struct tdescr *td)24{25 int res = sve_fill_vls(VLS_USE_SVE, 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_sve_regs(void)37{38 /* RDVL x16, #1 so we should have SVE regs; real data is TODO */39 asm volatile(".inst 0x04bf5030" : : : "x16" );40}41 42static int do_one_sve_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,43 unsigned int vl)44{45 size_t offset;46 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);47 struct sve_context *sve;48 49 fprintf(stderr, "Testing VL %d\n", vl);50 51 if (prctl(PR_SVE_SET_VL, vl) == -1) {52 fprintf(stderr, "Failed to set VL\n");53 return 1;54 }55 56 /*57 * Get a signal context which should have a SVE frame and registers58 * in it.59 */60 setup_sve_regs();61 if (!get_current_context(td, &context.uc, sizeof(context)))62 return 1;63 64 head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),65 &offset);66 if (!head) {67 fprintf(stderr, "No SVE context\n");68 return 1;69 }70 71 sve = (struct sve_context *)head;72 if (sve->vl != vl) {73 fprintf(stderr, "Got VL %d, expected %d\n", sve->vl, vl);74 return 1;75 }76 77 /* The actual size validation is done in get_current_context() */78 fprintf(stderr, "Got expected size %u and VL %d\n",79 head->size, sve->vl);80 81 return 0;82}83 84static int sve_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)85{86 int i;87 88 for (i = 0; i < nvls; i++) {89 if (do_one_sve_vl(td, si, uc, vls[i]))90 return 1;91 }92 93 td->pass = 1;94 95 return 0;96}97 98struct tdescr tde = {99 .name = "SVE registers",100 .descr = "Check that we get the right SVE registers reported",101 .feats_required = FEAT_SVE,102 .timeout = 3,103 .init = sve_get_vls,104 .run = sve_regs,105};106