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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2026 Arm Ltd
*
* Verify that the POR_EL0 register is left untouched on sigreturn if the
* POE frame record is missing.
*/
#include <asm/sigcontext.h>
#include "test_signals_utils.h"
#include "testcases.h"
#define POR_EL0_INIT 0x07ul
#define POR_EL0_CUSTOM 0x77ul
static bool failed_check;
static bool modify_por_el0(struct tdescr *td)
{
set_por_el0(POR_EL0_CUSTOM);
return true;
}
static int signal_remove_poe_context(struct tdescr *td, siginfo_t *si,
ucontext_t *uc)
{
struct _aarch64_ctx *ctx = GET_UC_RESV_HEAD(uc);
size_t resv_size = GET_UCP_RESV_SIZE(uc);
struct _aarch64_ctx *poe_ctx_head;
poe_ctx_head = get_header(ctx, POE_MAGIC, resv_size, NULL);
if (!poe_ctx_head) {
fprintf(stderr, "Missing poe_context record\n");
failed_check = true;
return 0;
}
/*
* Actually removing the record would require moving down the next
* records. An easier option is to turn it into an ESR record, which is
* ignored by sigreturn().
*/
poe_ctx_head->magic = ESR_MAGIC;
return 0;
}
static void check_por_el0_preserved(struct tdescr *td)
{
uint64_t por_el0 = get_por_el0();
if (por_el0 == POR_EL0_INIT) {
fprintf(stderr, "POR_EL0 preserved\n");
} else {
fprintf(stderr, "POR_EL0 unexpectedly set to %lx\n", por_el0);
failed_check = true;
}
td->pass = !failed_check;
}
struct tdescr tde = {
.name = "POR_EL0 missing poe_context",
.descr = "Remove poe_context record and check POR_EL0 is preserved",
.feats_required = FEAT_POE,
.timeout = 3,
.sig_trig = SIGUSR1,
.init = modify_por_el0,
.run = signal_remove_poe_context,
.check_result = check_por_el0_preserved,
};
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