diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 1997-04-29 21:13:14 +0000 |
|---|---|---|
| committer | <ralf@linux-mips.org> | 1997-04-29 21:13:14 +0000 |
| commit | 19c9bba94152148523ba0f7ef7cffe3d45656b11 (patch) | |
| tree | 40b1cb534496a7f1ca0f5c314a523c69f1fee464 /arch/sparc64/lib/strncpy_from_user.S | |
| parent | 7206675c40394c78a90e74812bbdbf8cf3cca1be (diff) | |
Import of Linux/MIPS 2.1.36
Diffstat (limited to 'arch/sparc64/lib/strncpy_from_user.S')
| -rw-r--r-- | arch/sparc64/lib/strncpy_from_user.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/sparc64/lib/strncpy_from_user.S b/arch/sparc64/lib/strncpy_from_user.S new file mode 100644 index 000000000..05a48eb5a --- /dev/null +++ b/arch/sparc64/lib/strncpy_from_user.S @@ -0,0 +1,54 @@ +/* strncpy_from_user.S: Sparc64 strncpy from userspace. + * + * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#include <asm/asi.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 */ + brlez,pn %o2, 3f + add %o1, %o2, %o1 + sub %g0, %o2, %o3 + add %o0, %o2, %o0 +10: + ldub [%o1 + %o3], %o4 +1: + brz,pn %o4, 2f + stb %o4, [%o0 + %o3] + addcc %o3, 1, %o3 + bne,pt %xcc, 1b +11: + ldub [%o1 + %o3], %o4 + retl + mov %o2, %o0 +2: + add %o3, 1, %o3 + retl + add %o2, %o3, %o0 +3: + retl + clr %o0 + + .section .fixup,#alloc,#execinstr + .align 4 +4: + retl + mov -EFAULT, %o0 + + .section __ex_table,#alloc + .align 4 + .word 10b, 4b + .word 11b, 4b |