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96 lines
1.8 KiB
96 lines
1.8 KiB
20 years ago
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/* strlen_user.S: Sparc64 optimized strlen_user code
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*
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* Return length of string in userspace including terminating 0
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* or 0 for error
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*
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* Copyright (C) 1991,1996 Free Software Foundation
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* Copyright (C) 1996,1999 David S. Miller (davem@redhat.com)
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* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <asm/asi.h>
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#define LO_MAGIC 0x01010101
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#define HI_MAGIC 0x80808080
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.align 4
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.global __strlen_user, __strnlen_user
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__strlen_user:
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sethi %hi(32768), %o1
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__strnlen_user:
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mov %o1, %g1
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mov %o0, %o1
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andcc %o0, 3, %g0
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be,pt %icc, 9f
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sethi %hi(HI_MAGIC), %o4
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10: lduba [%o0] %asi, %o5
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brz,pn %o5, 21f
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add %o0, 1, %o0
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andcc %o0, 3, %g0
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be,pn %icc, 4f
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or %o4, %lo(HI_MAGIC), %o3
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11: lduba [%o0] %asi, %o5
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brz,pn %o5, 22f
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add %o0, 1, %o0
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andcc %o0, 3, %g0
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be,pt %icc, 13f
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srl %o3, 7, %o2
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12: lduba [%o0] %asi, %o5
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brz,pn %o5, 23f
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add %o0, 1, %o0
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ba,pt %icc, 2f
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15: lda [%o0] %asi, %o5
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9: or %o4, %lo(HI_MAGIC), %o3
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4: srl %o3, 7, %o2
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13: lda [%o0] %asi, %o5
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2: sub %o5, %o2, %o4
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andcc %o4, %o3, %g0
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bne,pn %icc, 82f
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add %o0, 4, %o0
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sub %o0, %o1, %g2
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81: cmp %g2, %g1
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blu,pt %icc, 13b
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mov %o0, %o4
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ba,a,pt %xcc, 1f
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/* Check every byte. */
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82: srl %o5, 24, %g7
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andcc %g7, 0xff, %g0
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be,pn %icc, 1f
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add %o0, -3, %o4
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srl %o5, 16, %g7
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andcc %g7, 0xff, %g0
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be,pn %icc, 1f
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add %o4, 1, %o4
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srl %o5, 8, %g7
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andcc %g7, 0xff, %g0
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be,pn %icc, 1f
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add %o4, 1, %o4
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andcc %o5, 0xff, %g0
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bne,pt %icc, 81b
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sub %o0, %o1, %g2
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add %o4, 1, %o4
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1: retl
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sub %o4, %o1, %o0
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21: retl
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mov 1, %o0
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22: retl
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mov 2, %o0
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23: retl
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mov 3, %o0
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.section .fixup,#alloc,#execinstr
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.align 4
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30:
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retl
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clr %o0
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.section __ex_table,#alloc
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.align 4
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.word 10b, 30b
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.word 11b, 30b
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.word 12b, 30b
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.word 15b, 30b
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.word 13b, 30b
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