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/sparc/lib/strlen_user.S | |
| parent | 7206675c40394c78a90e74812bbdbf8cf3cca1be (diff) | |
Import of Linux/MIPS 2.1.36
Diffstat (limited to 'arch/sparc/lib/strlen_user.S')
| -rw-r--r-- | arch/sparc/lib/strlen_user.S | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/arch/sparc/lib/strlen_user.S b/arch/sparc/lib/strlen_user.S new file mode 100644 index 000000000..6f2328e06 --- /dev/null +++ b/arch/sparc/lib/strlen_user.S @@ -0,0 +1,104 @@ +/* strlen_user.S: Sparc optimized strlen_user code + * + * Return length of string in userspace including terminating 0 + * or 0 for error + * + * Copyright (C) 1991,1996 Free Software Foundation + * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) + * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#include <asm/cprefix.h> + +#define LO_MAGIC 0x01010101 +#define HI_MAGIC 0x80808080 + +10: + ldub [%o0], %o5 + cmp %o5, 0 + be 1f + add %o0, 1, %o0 + andcc %o0, 3, %g0 + be 4f + or %o4, %lo(HI_MAGIC), %o3 +11: + ldub [%o0], %o5 + cmp %o5, 0 + be 2f + add %o0, 1, %o0 + andcc %o0, 3, %g0 + be 5f + sethi %hi(LO_MAGIC), %o4 +12: + ldub [%o0], %o5 + cmp %o5, 0 + be 3f + add %o0, 1, %o0 + b 13f + or %o4, %lo(LO_MAGIC), %o2 +1: + retl + mov 1, %o0 +2: + retl + mov 2, %o0 +3: + retl + mov 3, %o0 + + .align 4 + .global C_LABEL(__strlen_user) +C_LABEL(__strlen_user): + mov %o0, %o1 + andcc %o0, 3, %g0 + bne 10b + sethi %hi(HI_MAGIC), %o4 + or %o4, %lo(HI_MAGIC), %o3 +4: + sethi %hi(LO_MAGIC), %o4 +5: + or %o4, %lo(LO_MAGIC), %o2 +13: + ld [%o0], %o5 +2: + sub %o5, %o2, %o4 + andcc %o4, %o3, %g0 + be 13b + add %o0, 4, %o0 + + /* Check every byte. */ + srl %o5, 24, %g5 + andcc %g5, 0xff, %g0 + be 1f + add %o0, -3, %o4 + srl %o5, 16, %g5 + andcc %g5, 0xff, %g0 + be 1f + add %o4, 1, %o4 + srl %o5, 8, %g5 + andcc %g5, 0xff, %g0 + be 1f + add %o4, 1, %o4 + andcc %o5, 0xff, %g0 + bne,a 2b +14: + ld [%o0], %o5 + add %o4, 1, %o4 +1: + retl + sub %o4, %o1, %o0 + + .section .fixup,#alloc,#execinstr + .align 4 +9: + retl + clr %o0 + + .section __ex_table,#alloc + .align 4 + + .word 10b, 9b + .word 11b, 9b + .word 12b, 9b + .word 13b, 9b + .word 14b, 9b |