1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2021 ARM Limited 4 * 5 * Verify that the SVE register context in signal frames is set up as 6 * 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 18 static union { 19 ucontext_t uc; 20 char buf[1024 * 64]; 21 } context; 22 23 static 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 36 static 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 42 static 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 registers 58 * 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 84 static 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 98 struct 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