diff options
Diffstat (limited to 'arch/sparc/lib/strncpy_from_user.S')
| -rw-r--r-- | arch/sparc/lib/strncpy_from_user.S | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/sparc/lib/strncpy_from_user.S b/arch/sparc/lib/strncpy_from_user.S new file mode 100644 index 00000000000..d77198976a6 --- /dev/null +++ b/arch/sparc/lib/strncpy_from_user.S @@ -0,0 +1,47 @@ +/* strncpy_from_user.S: Sparc strncpy from userspace. + * + * Copyright(C) 1996 David S. Miller + */ + +#include <asm/ptrace.h> +#include <asm/errno.h> + + .text + .align 4 + + /* Must return: + * + * -EFAULT for an exception + * count if we hit the buffer limit + * bytes copied if we hit a null byte + */ + + .globl __strncpy_from_user +__strncpy_from_user: + /* %o0=dest, %o1=src, %o2=count */ + mov %o2, %o3 +1: + subcc %o2, 1, %o2 + bneg 2f + nop +10: + ldub [%o1], %o4 + add %o0, 1, %o0 + cmp %o4, 0 + add %o1, 1, %o1 + bne 1b + stb %o4, [%o0 - 1] +2: + add %o2, 1, %o0 + retl + sub %o3, %o0, %o0 + + .section .fixup,#alloc,#execinstr + .align 4 +4: + retl + mov -EFAULT, %o0 + + .section __ex_table,#alloc + .align 4 + .word 10b, 4b |