diff options
Diffstat (limited to 'arch/sparc64/lib/strlen_user.S')
| -rw-r--r-- | arch/sparc64/lib/strlen_user.S | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/sparc64/lib/strlen_user.S b/arch/sparc64/lib/strlen_user.S new file mode 100644 index 000000000..24bea73fd --- /dev/null +++ b/arch/sparc64/lib/strlen_user.S @@ -0,0 +1,99 @@ +/* strlen_user.S: Sparc64 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) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +#define LO_MAGIC 0x01010101 +#define HI_MAGIC 0x80808080 + + .align 4 + .global __strlen_user +__strlen_user: + mov %o0, %o1 + andcc %o0, 3, %g0 + be,pt %icc, 9f + sethi %hi(HI_MAGIC), %o4 +10: + ldub [%o0], %o5 + brz,pn %o5, 21f + add %o0, 1, %o0 + andcc %o0, 3, %g0 + be,pn %icc, 4f + or %o4, %lo(HI_MAGIC), %o3 +11: + ldub [%o0], %o5 + brz,pn %o5, 22f + add %o0, 1, %o0 + andcc %o0, 3, %g0 + be,pt %icc, 5f + sethi %hi(LO_MAGIC), %o4 +12: + ldub [%o0], %o5 + brz,pn %o5, 23f + add %o0, 1, %o0 + ba,pt %icc, 13f + or %o4, %lo(LO_MAGIC), %o2 +9: + 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,pt %icc, 13b + add %o0, 4, %o0 + + /* Check every byte. */ + srl %o5, 24, %g5 + andcc %g5, 0xff, %g0 + be,pn %icc, 1f + add %o0, -3, %o4 + srl %o5, 16, %g5 + andcc %g5, 0xff, %g0 + be,pn %icc, 1f + add %o4, 1, %o4 + srl %o5, 8, %g5 + andcc %g5, 0xff, %g0 + be,pn %icc, 1f + add %o4, 1, %o4 + andcc %o5, 0xff, %g0 + bne,a,pt %icc, 2b +14: + ld [%o0], %o5 + add %o4, 1, %o4 +1: + retl + sub %o4, %o1, %o0 +21: + retl + mov 1, %o0 +22: + retl + mov 2, %o0 +23: + retl + mov 3, %o0 + + .section .fixup,#alloc,#execinstr + .align 4 +30: + retl + clr %o0 + + .section __ex_table,#alloc + .align 4 + + .word 10b, 30b + .word 11b, 30b + .word 12b, 30b + .word 13b, 30b + .word 14b, 30b |