diff options
Diffstat (limited to 'tools/testing/selftests/arm64/signal/testcases/sve_regs.c')
-rw-r--r-- | tools/testing/selftests/arm64/signal/testcases/sve_regs.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/signal/testcases/sve_regs.c b/tools/testing/selftests/arm64/signal/testcases/sve_regs.c new file mode 100644 index 000000000..8b16eabbb --- /dev/null +++ b/tools/testing/selftests/arm64/signal/testcases/sve_regs.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 ARM Limited + * + * Verify that the SVE 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" + +static union { + ucontext_t uc; + char buf[1024 * 64]; +} context; +static unsigned int vls[SVE_VQ_MAX]; +unsigned int nvls = 0; + +static bool sve_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_SVE_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_sve_regs(void) +{ + /* RDVL x16, #1 so we should have SVE regs; real data is TODO */ + asm volatile(".inst 0x04bf5030" : : : "x16" ); +} + +static int do_one_sve_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc, + unsigned int vl) +{ + size_t offset; + struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context); + struct sve_context *sve; + + fprintf(stderr, "Testing VL %d\n", vl); + + if (prctl(PR_SVE_SET_VL, vl) == -1) { + fprintf(stderr, "Failed to set VL\n"); + return 1; + } + + /* + * Get a signal context which should have a SVE frame and registers + * in it. + */ + setup_sve_regs(); + if (!get_current_context(td, &context.uc, sizeof(context))) + return 1; + + head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context), + &offset); + if (!head) { + fprintf(stderr, "No SVE context\n"); + return 1; + } + + sve = (struct sve_context *)head; + if (sve->vl != vl) { + fprintf(stderr, "Got VL %d, expected %d\n", sve->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, sve->vl); + + return 0; +} + +static int sve_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc) +{ + int i; + + for (i = 0; i < nvls; i++) { + if (do_one_sve_vl(td, si, uc, vls[i])) + return 1; + } + + td->pass = 1; + + return 0; +} + +struct tdescr tde = { + .name = "SVE registers", + .descr = "Check that we get the right SVE registers reported", + .feats_required = FEAT_SVE, + .timeout = 3, + .init = sve_get_vls, + .run = sve_regs, +}; |