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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2023 Arm Limited
*
* Verify that the POR_EL0 register context in signal frames is set up as
* expected.
*/
#include <signal.h>
#include <ucontext.h>
#include <sys/auxv.h>
#include <sys/prctl.h>
#include <unistd.h>
#include <asm/sigcontext.h>
#include "test_signals_utils.h"
#include "testcases.h"
static union {
ucontext_t uc;
char buf[1024 * 128];
} context;
#define SYS_POR_EL0 "S3_3_C10_C2_4"
static uint64_t get_por_el0(void)
{
uint64_t val;
asm volatile(
"mrs %0, " SYS_POR_EL0 "\n"
: "=r"(val)
:
: );
return val;
}
int poe_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
{
struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
struct poe_context *poe_ctx;
size_t offset;
bool in_sigframe;
bool have_poe;
__u64 orig_poe;
have_poe = getauxval(AT_HWCAP2) & HWCAP2_POE;
if (have_poe)
orig_poe = get_por_el0();
if (!get_current_context(td, &context.uc, sizeof(context)))
return 1;
poe_ctx = (struct poe_context *)
get_header(head, POE_MAGIC, td->live_sz, &offset);
in_sigframe = poe_ctx != NULL;
fprintf(stderr, "POR_EL0 sigframe %s on system %s POE\n",
in_sigframe ? "present" : "absent",
have_poe ? "with" : "without");
td->pass = (in_sigframe == have_poe);
/*
* Check that the value we read back was the one present at
* the time that the signal was triggered.
*/
if (have_poe && poe_ctx) {
if (poe_ctx->por_el0 != orig_poe) {
fprintf(stderr, "POR_EL0 in frame is %llx, was %llx\n",
poe_ctx->por_el0, orig_poe);
td->pass = false;
}
}
return 0;
}
struct tdescr tde = {
.name = "POR_EL0",
.descr = "Validate that POR_EL0 is present as expected",
.timeout = 3,
.run = poe_present,
};
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