diff options
Diffstat (limited to 'arch/nds32/lib/copy_to_user.S')
| -rw-r--r-- | arch/nds32/lib/copy_to_user.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/nds32/lib/copy_to_user.S b/arch/nds32/lib/copy_to_user.S new file mode 100644 index 000000000000..3230044dcfb8 --- /dev/null +++ b/arch/nds32/lib/copy_to_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 +lbi.bi \dst, [\addr], \adj +.endm + +.macro sbi1 src, addr, adj +USER( sbi.bi, \src, [\addr], \adj) +.endm + +.macro lmw1 start_reg, addr, end_reg +lmw.bim \start_reg, [\addr], \end_reg +.endm + +.macro smw1 start_reg, addr, end_reg +USER( smw.bim, \start_reg, [\addr], \end_reg) +.endm + + +/* Prototype: int __arch_copy_to_user(void *to, const char *from, size_t n) + * Purpose : copy a block to user memory from kernel memory + * Params : to - user memory + * : from - kernel memory + * : n - number of bytes to copy + * Returns : Number of bytes NOT copied. + */ + +.text +ENTRY(__arch_copy_to_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_to_user) |