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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm64/lib/copy_to_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/arm64/lib/copy_to_user.S')
-rw-r--r-- | arch/arm64/lib/copy_to_user.S | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S new file mode 100644 index 000000000..802231772 --- /dev/null +++ b/arch/arm64/lib/copy_to_user.S @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2012 ARM Ltd. + */ + +#include <linux/linkage.h> + +#include <asm/asm-uaccess.h> +#include <asm/assembler.h> +#include <asm/cache.h> + +/* + * Copy to user space from a kernel buffer (alignment handled by the hardware) + * + * Parameters: + * x0 - to + * x1 - from + * x2 - n + * Returns: + * x0 - bytes not copied + */ + .macro ldrb1 reg, ptr, val + ldrb \reg, [\ptr], \val + .endm + + .macro strb1 reg, ptr, val + user_ldst 9998f, sttrb, \reg, \ptr, \val + .endm + + .macro ldrh1 reg, ptr, val + ldrh \reg, [\ptr], \val + .endm + + .macro strh1 reg, ptr, val + user_ldst 9997f, sttrh, \reg, \ptr, \val + .endm + + .macro ldr1 reg, ptr, val + ldr \reg, [\ptr], \val + .endm + + .macro str1 reg, ptr, val + user_ldst 9997f, sttr, \reg, \ptr, \val + .endm + + .macro ldp1 reg1, reg2, ptr, val + ldp \reg1, \reg2, [\ptr], \val + .endm + + .macro stp1 reg1, reg2, ptr, val + user_stp 9997f, \reg1, \reg2, \ptr, \val + .endm + +end .req x5 +srcin .req x15 +SYM_FUNC_START(__arch_copy_to_user) + add end, x0, x2 + mov srcin, x1 +#include "copy_template.S" + mov x0, #0 + ret + + // Exception fixups +9997: cmp dst, dstin + b.ne 9998f + // Before being absolutely sure we couldn't copy anything, try harder + ldrb tmp1w, [srcin] +USER(9998f, sttrb tmp1w, [dst]) + add dst, dst, #1 +9998: sub x0, end, dst // bytes not copied + ret +SYM_FUNC_END(__arch_copy_to_user) +EXPORT_SYMBOL(__arch_copy_to_user) |