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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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212b0426bc
Add a small testcase that attempts to do a clone() with ZA enabled and verifies that it remains enabled with the same contents. We only check one word in one horizontal vector of ZA since there's already other tests that check for data corruption more broadly, we're just looking to make sure that ZA is still enabled and it looks like the data got copied. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20220419112247.711548-40-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
61 lines
979 B
ArmAsm
61 lines
979 B
ArmAsm
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (C) 2021 ARM Limited.
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#include "sme-inst.h"
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.arch_extension sve
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#define MAGIC 42
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#define MAXVL 2048
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#define MAXVL_B (MAXVL / 8)
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.pushsection .text
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.data
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.align 4
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scratch:
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.space MAXVL_B
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.popsection
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.globl fork_test
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fork_test:
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smstart_za
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// For simplicity just set one word in one vector, other tests
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// cover general data corruption issues.
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ldr x0, =scratch
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mov x1, #MAGIC
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str x1, [x0]
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mov w12, wzr
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_ldr_za 12, 0 // ZA.H[W12] loaded from [X0]
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// Tail call into the C portion that does the fork & verify
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b fork_test_c
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.globl verify_fork
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verify_fork:
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// SVCR should have ZA=1, SM=0
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mrs x0, S3_3_C4_C2_2
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and x1, x0, #3
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cmp x1, #2
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beq 1f
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mov x0, xzr
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b 100f
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1:
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// ZA should still have the value we loaded
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ldr x0, =scratch
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mov w12, wzr
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_str_za 12, 0 // ZA.H[W12] stored to [X0]
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ldr x1, [x0]
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cmp x1, #MAGIC
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beq 2f
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mov x0, xzr
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b 100f
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2:
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// All tests passed
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mov x0, #1
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100:
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ret
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