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arch/parisc/lib/lusercopy.S
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/* * User Space Access Routines * * Copyright (C) 2000-2002 Hewlett-Packard (John Marvin) * Copyright (C) 2000 Richard Hirst <rhirst with parisc-linux.org> * Copyright (C) 2001 Matthieu Delahaye <delahaym at esiee.fr> * Copyright (C) 2003 Randolph Chung <tausq with parisc-linux.org> * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * These routines still have plenty of room for optimization * (word & doubleword load/store, dual issue, store hints, etc.). */ /* * The following routines assume that space register 3 (sr3) contains * the space id associated with the current users address space. */ |
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.text |
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#include <asm/assembly.h> #include <asm/errno.h> |
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#include <linux/linkage.h> |
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/* * get_sr gets the appropriate space value into * sr1 for kernel/user space access, depending * on the flag stored in the task structure. */ .macro get_sr mfctl %cr30,%r1 ldw TI_SEGMENT(%r1),%r22 mfsp %sr3,%r1 or,<> %r22,%r0,%r0 copy %r0,%r1 mtsp %r1,%sr1 .endm .macro fixup_branch lbl ldil L%\lbl, %r1 ldo R%\lbl(%r1), %r1 bv %r0(%r1) .endm /* * long lstrncpy_from_user(char *dst, const char *src, long n) * * Returns -EFAULT if exception before terminator, * N if the entire buffer filled, * otherwise strlen (i.e. excludes zero byte) */ |
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ENTRY(lstrncpy_from_user) |
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.proc .callinfo NO_CALLS .entry comib,= 0,%r24,$lsfu_done copy %r24,%r23 get_sr 1: ldbs,ma 1(%sr1,%r25),%r1 $lsfu_loop: stbs,ma %r1,1(%r26) comib,=,n 0,%r1,$lsfu_done addib,<>,n -1,%r24,$lsfu_loop 2: ldbs,ma 1(%sr1,%r25),%r1 $lsfu_done: sub %r23,%r24,%r28 $lsfu_exit: bv %r0(%r2) nop .exit |
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ENDPROC(lstrncpy_from_user) |
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.section .fixup,"ax" 3: fixup_branch $lsfu_exit ldi -EFAULT,%r28 .previous .section __ex_table,"aw" |
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ASM_ULONG_INSN 1b,3b ASM_ULONG_INSN 2b,3b |
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.previous .procend /* * unsigned long lclear_user(void *to, unsigned long n) * * Returns 0 for success. * otherwise, returns number of bytes not transferred. */ |
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ENTRY(lclear_user) |
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.proc .callinfo NO_CALLS .entry comib,=,n 0,%r25,$lclu_done get_sr $lclu_loop: addib,<> -1,%r25,$lclu_loop 1: stbs,ma %r0,1(%sr1,%r26) $lclu_done: bv %r0(%r2) copy %r25,%r28 .exit |
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ENDPROC(lclear_user) |
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.section .fixup,"ax" 2: fixup_branch $lclu_done ldo 1(%r25),%r25 .previous .section __ex_table,"aw" |
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ASM_ULONG_INSN 1b,2b |
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.previous .procend /* * long lstrnlen_user(char *s, long n) * * Returns 0 if exception before zero byte or reaching N, * N+1 if N would be exceeded, * else strlen + 1 (i.e. includes zero byte). */ |
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ENTRY(lstrnlen_user) |
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.proc .callinfo NO_CALLS .entry comib,= 0,%r25,$lslen_nzero copy %r26,%r24 get_sr 1: ldbs,ma 1(%sr1,%r26),%r1 $lslen_loop: comib,=,n 0,%r1,$lslen_done addib,<> -1,%r25,$lslen_loop 2: ldbs,ma 1(%sr1,%r26),%r1 $lslen_done: bv %r0(%r2) sub %r26,%r24,%r28 .exit $lslen_nzero: b $lslen_done ldo 1(%r26),%r26 /* special case for N == 0 */ |
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ENDPROC(lstrnlen_user) |
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.section .fixup,"ax" 3: fixup_branch $lslen_done copy %r24,%r26 /* reset r26 so 0 is returned on fault */ .previous .section __ex_table,"aw" |
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ASM_ULONG_INSN 1b,3b ASM_ULONG_INSN 2b,3b |
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.previous .procend .end |