| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 2021 ARM Limited |
| * |
| * Verify that the ZA 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 sme_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_SME_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_za_regs(void) |
| { |
| /* smstart za; real data is TODO */ |
| asm volatile(".inst 0xd503457f" : : : ); |
| } |
| |
| static int do_one_sme_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 za_context *za; |
| |
| fprintf(stderr, "Testing VL %d\n", vl); |
| |
| if (prctl(PR_SME_SET_VL, vl) != vl) { |
| fprintf(stderr, "Failed to set VL\n"); |
| return 1; |
| } |
| |
| /* |
| * Get a signal context which should have a SVE frame and registers |
| * in it. |
| */ |
| setup_za_regs(); |
| if (!get_current_context(td, &sf.uc)) |
| return 1; |
| |
| resv_sz = GET_SF_RESV_SIZE(sf); |
| head = get_header(head, ZA_MAGIC, resv_sz, &offset); |
| if (!head) { |
| fprintf(stderr, "No ZA context\n"); |
| return 1; |
| } |
| |
| za = (struct za_context *)head; |
| if (za->vl != vl) { |
| fprintf(stderr, "Got VL %d, expected %d\n", za->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, za->vl); |
| |
| return 0; |
| } |
| |
| static int sme_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] > 32) { |
| printf("Skipping VL %u due to stack size\n", vls[i]); |
| continue; |
| } |
| |
| if (do_one_sme_vl(td, si, uc, vls[i])) |
| return 1; |
| } |
| |
| td->pass = 1; |
| |
| return 0; |
| } |
| |
| struct tdescr tde = { |
| .name = "ZA register", |
| .descr = "Check that we get the right ZA registers reported", |
| .feats_required = FEAT_SME, |
| .timeout = 3, |
| .init = sme_get_vls, |
| .run = sme_regs, |
| }; |