87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2023 Arm Limited
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*
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* Verify that the POR_EL0 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_POR_EL0 "S3_3_C10_C2_4"
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static uint64_t get_por_el0(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_POR_EL0 "\n"
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: "=r"(val)
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:
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: );
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return val;
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}
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int poe_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 poe_context *poe_ctx;
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size_t offset;
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bool in_sigframe;
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bool have_poe;
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__u64 orig_poe;
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have_poe = getauxval(AT_HWCAP2) & HWCAP2_POE;
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if (have_poe)
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orig_poe = get_por_el0();
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if (!get_current_context(td, &context.uc, sizeof(context)))
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return 1;
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poe_ctx = (struct poe_context *)
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get_header(head, POE_MAGIC, td->live_sz, &offset);
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in_sigframe = poe_ctx != NULL;
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fprintf(stderr, "POR_EL0 sigframe %s on system %s POE\n",
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in_sigframe ? "present" : "absent",
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have_poe ? "with" : "without");
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td->pass = (in_sigframe == have_poe);
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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.
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*/
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if (have_poe && poe_ctx) {
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if (poe_ctx->por_el0 != orig_poe) {
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fprintf(stderr, "POR_EL0 in frame is %llx, was %llx\n",
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poe_ctx->por_el0, orig_poe);
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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 = "POR_EL0",
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.descr = "Validate that POR_EL0 is present as expected",
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.timeout = 3,
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.run = poe_present,
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};
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