| /* 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) 1996,1999 David S. Miller (davem@redhat.com) |
| * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/asi.h> |
| |
| #define LO_MAGIC 0x01010101 |
| #define HI_MAGIC 0x80808080 |
| |
| .align 4 |
| ENTRY(__strlen_user) |
| sethi %hi(32768), %o1 |
| ENTRY(__strnlen_user) |
| mov %o1, %g1 |
| 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 |
| bne,pn %icc, 82f |
| add %o0, 4, %o0 |
| sub %o0, %o1, %g2 |
| 81: cmp %g2, %g1 |
| blu,pt %icc, 13b |
| mov %o0, %o4 |
| ba,a,pt %xcc, 1f |
| |
| /* Check every byte. */ |
| 82: srl %o5, 24, %g7 |
| andcc %g7, 0xff, %g0 |
| be,pn %icc, 1f |
| add %o0, -3, %o4 |
| srl %o5, 16, %g7 |
| andcc %g7, 0xff, %g0 |
| be,pn %icc, 1f |
| add %o4, 1, %o4 |
| srl %o5, 8, %g7 |
| andcc %g7, 0xff, %g0 |
| be,pn %icc, 1f |
| add %o4, 1, %o4 |
| andcc %o5, 0xff, %g0 |
| bne,pt %icc, 81b |
| sub %o0, %o1, %g2 |
| 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 |
| ENDPROC(__strlen_user) |
| ENDPROC(__strnlen_user) |
| |
| .section .fixup,#alloc,#execinstr |
| .align 4 |
| 30: |
| retl |
| clr %o0 |
| |
| .section __ex_table,"a" |
| .align 4 |
| |
| .word 10b, 30b |
| .word 11b, 30b |
| .word 12b, 30b |
| .word 15b, 30b |
| .word 13b, 30b |