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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 01:02:30 +0000 |
| commit | 76cb841cb886eef6b3bee341a2266c76578724ad (patch) | |
| tree | f5892e5ba6cc11949952a6ce4ecbe6d516d6ce58 /arch/nds32/lib/copy_from_user.S | |
| parent | Initial commit. (diff) | |
| download | linux-76cb841cb886eef6b3bee341a2266c76578724ad.tar.xz linux-76cb841cb886eef6b3bee341a2266c76578724ad.zip | |
Adding upstream version 4.19.249.upstream/4.19.249upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/nds32/lib/copy_from_user.S')
| -rw-r--r-- | arch/nds32/lib/copy_from_user.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/nds32/lib/copy_from_user.S b/arch/nds32/lib/copy_from_user.S new file mode 100644 index 000000000..ad1857b20 --- /dev/null +++ b/arch/nds32/lib/copy_from_user.S @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2005-2017 Andes Technology Corporation + +#include <linux/linkage.h> +#include <asm/assembler.h> +#include <asm/errno.h> + +.macro lbi1 dst, addr, adj +USER( lbi.bi, \dst, [\addr], \adj) +.endm + +.macro sbi1 src, addr, adj +sbi.bi \src, [\addr], \adj +.endm + +.macro lmw1 start_reg, addr, end_reg +USER( lmw.bim, \start_reg, [\addr], \end_reg) +.endm + +.macro smw1 start_reg, addr, end_reg +smw.bim \start_reg, [\addr], \end_reg +.endm + + +/* Prototype: int __arch_copy_from_user(void *to, const char *from, size_t n) + * Purpose : copy a block from user memory to kernel memory + * Params : to - kernel memory + * : from - user memory + * : n - number of bytes to copy + * Returns : Number of bytes NOT copied. + */ + +.text +ENTRY(__arch_copy_from_user) + add $r5, $r0, $r2 +#include "copy_template.S" + move $r0, $r2 + ret +.section .fixup,"ax" +.align 2 +9001: + sub $r0, $r5, $r0 + ret +.previous +ENDPROC(__arch_copy_from_user) |