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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2022 ARM Limited
*
* Verify that the TPIDR2 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_TPIDR2 "S3_3_C13_C0_5"
static uint64_t get_tpidr2(void)
{
uint64_t val;
asm volatile (
"mrs %0, " SYS_TPIDR2 "\n"
: "=r"(val)
:
: "cc");
return val;
}
int tpidr2_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
{
struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
struct tpidr2_context *tpidr2_ctx;
size_t offset;
bool in_sigframe;
bool have_sme;
__u64 orig_tpidr2;
have_sme = getauxval(AT_HWCAP2) & HWCAP2_SME;
if (have_sme)
orig_tpidr2 = get_tpidr2();
if (!get_current_context(td, &context.uc, sizeof(context)))
return 1;
tpidr2_ctx = (struct tpidr2_context *)
get_header(head, TPIDR2_MAGIC, td->live_sz, &offset);
in_sigframe = tpidr2_ctx != NULL;
fprintf(stderr, "TPIDR2 sigframe %s on system %s SME\n",
in_sigframe ? "present" : "absent",
have_sme ? "with" : "without");
td->pass = (in_sigframe == have_sme);
/*
* Check that the value we read back was the one present at
* the time that the signal was triggered. TPIDR2 is owned by
* libc so we can't safely choose the value and it is possible
* that we may need to revisit this in future if something
* starts deciding to set a new TPIDR2 between us reading and
* the signal.
*/
if (have_sme && tpidr2_ctx) {
if (tpidr2_ctx->tpidr2 != orig_tpidr2) {
fprintf(stderr, "TPIDR2 in frame is %llx, was %llx\n",
tpidr2_ctx->tpidr2, orig_tpidr2);
td->pass = false;
}
}
return 0;
}
struct tdescr tde = {
.name = "TPIDR2",
.descr = "Validate that TPIDR2 is present as expected",
.timeout = 3,
.run = tpidr2_present,
};
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