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/* 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) */ #include <asm/asi.h> #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: lduba [%o0] %asi, %o5 brz,pn %o5, 21f add %o0, 1, %o0 andcc %o0, 3, %g0 be,pn %icc, 4f or %o4, %lo(HI_MAGIC), %o3 11: lduba [%o0] %asi, %o5 brz,pn %o5, 22f add %o0, 1, %o0 andcc %o0, 3, %g0 be,pt %icc, 13f srl %o3, 7, %o2 12: lduba [%o0] %asi, %o5 brz,pn %o5, 23f add %o0, 1, %o0 ba,pt %icc, 2f 15: lda [%o0] %asi, %o5 9: or %o4, %lo(HI_MAGIC), %o3 4: srl %o3, 7, %o2 13: lda [%o0] %asi, %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: lda [%o0] %asi, %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 15b, 30b .word 13b, 30b .word 14b, 30b |