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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
| commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
| tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/loongarch/lib/clear_user.S | |
| parent | Initial commit. (diff) | |
| download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip | |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/loongarch/lib/clear_user.S')
| -rw-r--r-- | arch/loongarch/lib/clear_user.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/arch/loongarch/lib/clear_user.S b/arch/loongarch/lib/clear_user.S new file mode 100644 index 000000000..16ba2b8dd --- /dev/null +++ b/arch/loongarch/lib/clear_user.S @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + */ + +#include <asm/asm.h> +#include <asm/asmmacro.h> +#include <asm/export.h> +#include <asm/regdef.h> + +.macro fixup_ex from, to, offset, fix +.if \fix + .section .fixup, "ax" +\to: addi.d a0, a1, \offset + jr ra + .previous +.endif + .section __ex_table, "a" + PTR \from\()b, \to\()b + .previous +.endm + +/* + * unsigned long __clear_user(void *addr, size_t size) + * + * a0: addr + * a1: size + */ +SYM_FUNC_START(__clear_user) + beqz a1, 2f + +1: st.b zero, a0, 0 + addi.d a0, a0, 1 + addi.d a1, a1, -1 + bgtz a1, 1b + +2: move a0, a1 + jr ra + + fixup_ex 1, 3, 0, 1 +SYM_FUNC_END(__clear_user) + +EXPORT_SYMBOL(__clear_user) |