113 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2021 ARM Limited4 *5 * Verify that the streaming SVE register context in signal frames is6 * set up as 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 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_ssve_regs(void)37{38 /* smstart sm; real data is TODO */39 asm volatile(".inst 0xd503437f" : : : );40}41 42static int do_one_sme_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 *ssve;48 int ret;49 50 fprintf(stderr, "Testing VL %d\n", vl);51 52 ret = prctl(PR_SME_SET_VL, vl);53 if (ret != vl) {54 fprintf(stderr, "Failed to set VL, got %d\n", ret);55 return 1;56 }57 58 /*59 * Get a signal context which should have a SVE frame and registers60 * in it.61 */62 setup_ssve_regs();63 if (!get_current_context(td, &context.uc, sizeof(context)))64 return 1;65 66 head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),67 &offset);68 if (!head) {69 fprintf(stderr, "No SVE context\n");70 return 1;71 }72 73 ssve = (struct sve_context *)head;74 if (ssve->vl != vl) {75 fprintf(stderr, "Got VL %d, expected %d\n", ssve->vl, vl);76 return 1;77 }78 79 if (!(ssve->flags & SVE_SIG_FLAG_SM)) {80 fprintf(stderr, "SVE_SIG_FLAG_SM not set in SVE record\n");81 return 1;82 }83 84 /* The actual size validation is done in get_current_context() */85 fprintf(stderr, "Got expected size %u and VL %d\n",86 head->size, ssve->vl);87 88 return 0;89}90 91static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)92{93 int i;94 95 for (i = 0; i < nvls; i++) {96 if (do_one_sme_vl(td, si, uc, vls[i]))97 return 1;98 }99 100 td->pass = 1;101 102 return 0;103}104 105struct tdescr tde = {106 .name = "Streaming SVE registers",107 .descr = "Check that we get the right Streaming SVE registers reported",108 .feats_required = FEAT_SME,109 .timeout = 3,110 .init = sme_get_vls,111 .run = sme_regs,112};113