91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2022 ARM Limited
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*
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* Verify that the TPIDR2 register context in signal frames is set up as
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* expected.
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*/
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#include <signal.h>
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#include <ucontext.h>
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#include <sys/auxv.h>
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#include <sys/prctl.h>
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#include <unistd.h>
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#include <asm/sigcontext.h>
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#include "test_signals_utils.h"
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#include "testcases.h"
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static union {
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ucontext_t uc;
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char buf[1024 * 128];
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} context;
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#define SYS_TPIDR2 "S3_3_C13_C0_5"
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static uint64_t get_tpidr2(void)
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{
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uint64_t val;
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asm volatile (
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"mrs %0, " SYS_TPIDR2 "\n"
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: "=r"(val)
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:
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: "cc");
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return val;
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}
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int tpidr2_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
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{
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struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
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struct tpidr2_context *tpidr2_ctx;
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size_t offset;
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bool in_sigframe;
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bool have_sme;
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__u64 orig_tpidr2;
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have_sme = getauxval(AT_HWCAP2) & HWCAP2_SME;
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if (have_sme)
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orig_tpidr2 = get_tpidr2();
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if (!get_current_context(td, &context.uc, sizeof(context)))
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return 1;
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tpidr2_ctx = (struct tpidr2_context *)
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get_header(head, TPIDR2_MAGIC, td->live_sz, &offset);
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in_sigframe = tpidr2_ctx != NULL;
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fprintf(stderr, "TPIDR2 sigframe %s on system %s SME\n",
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in_sigframe ? "present" : "absent",
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have_sme ? "with" : "without");
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td->pass = (in_sigframe == have_sme);
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/*
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* Check that the value we read back was the one present at
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* the time that the signal was triggered. TPIDR2 is owned by
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* libc so we can't safely choose the value and it is possible
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* that we may need to revisit this in future if something
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* starts deciding to set a new TPIDR2 between us reading and
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* the signal.
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*/
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if (have_sme && tpidr2_ctx) {
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if (tpidr2_ctx->tpidr2 != orig_tpidr2) {
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fprintf(stderr, "TPIDR2 in frame is %llx, was %llx\n",
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tpidr2_ctx->tpidr2, orig_tpidr2);
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td->pass = false;
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}
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}
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return 0;
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}
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struct tdescr tde = {
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.name = "TPIDR2",
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.descr = "Validate that TPIDR2 is present as expected",
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.timeout = 3,
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.run = tpidr2_present,
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};
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