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// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2021 ARM Limited.
#include "sme-inst.h"
.arch_extension sve
#define MAGIC 42
#define MAXVL 2048
#define MAXVL_B (MAXVL / 8)
.pushsection .text
.data
.align 4
scratch:
.space MAXVL_B
.popsection
.globl fork_test
fork_test:
smstart_za
// For simplicity just set one word in one vector, other tests
// cover general data corruption issues.
ldr x0, =scratch
mov x1, #MAGIC
str x1, [x0]
mov w12, wzr
_ldr_za 12, 0 // ZA.H[W12] loaded from [X0]
// Tail call into the C portion that does the fork & verify
b fork_test_c
.globl verify_fork
verify_fork:
// SVCR should have ZA=1, SM=0
mrs x0, S3_3_C4_C2_2
and x1, x0, #3
cmp x1, #2
beq 1f
mov x0, xzr
b 100f
1:
// ZA should still have the value we loaded
ldr x0, =scratch
mov w12, wzr
_str_za 12, 0 // ZA.H[W12] stored to [X0]
ldr x1, [x0]
cmp x1, #MAGIC
beq 2f
mov x0, xzr
b 100f
2:
// All tests passed
mov x0, #1
100:
ret
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