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- /* copy_in_user.S: Copy from userspace to userspace.
- *
- * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
- */
- #include <linux/linkage.h>
- #include <asm/asi.h>
- #include <asm/export.h>
- #define XCC xcc
- #define EX(x,y,z) \
- 98: x,y; \
- .section __ex_table,"a";\
- .align 4; \
- .word 98b, z; \
- .text; \
- .align 4;
- #define EX_O4(x,y) EX(x,y,__retl_o4_plus_8)
- #define EX_O2_4(x,y) EX(x,y,__retl_o2_plus_4)
- #define EX_O2_1(x,y) EX(x,y,__retl_o2_plus_1)
- .register %g2,#scratch
- .register %g3,#scratch
- .text
- __retl_o4_plus_8:
- add %o4, %o2, %o4
- retl
- add %o4, 8, %o0
- __retl_o2_plus_4:
- retl
- add %o2, 4, %o0
- __retl_o2_plus_1:
- retl
- add %o2, 1, %o0
- .align 32
- /* Don't try to get too fancy here, just nice and
- * simple. This is predominantly used for well aligned
- * small copies in the compat layer. It is also used
- * to copy register windows around during thread cloning.
- */
- ENTRY(___copy_in_user) /* %o0=dst, %o1=src, %o2=len */
- cmp %o2, 0
- be,pn %XCC, 85f
- or %o0, %o1, %o3
- cmp %o2, 16
- bleu,a,pn %XCC, 80f
- or %o3, %o2, %o3
- /* 16 < len <= 64 */
- andcc %o3, 0x7, %g0
- bne,pn %XCC, 90f
- nop
- andn %o2, 0x7, %o4
- and %o2, 0x7, %o2
- 1: subcc %o4, 0x8, %o4
- EX_O4(ldxa [%o1] %asi, %o5)
- EX_O4(stxa %o5, [%o0] %asi)
- add %o1, 0x8, %o1
- bgu,pt %XCC, 1b
- add %o0, 0x8, %o0
- andcc %o2, 0x4, %g0
- be,pt %XCC, 1f
- nop
- sub %o2, 0x4, %o2
- EX_O2_4(lduwa [%o1] %asi, %o5)
- EX_O2_4(stwa %o5, [%o0] %asi)
- add %o1, 0x4, %o1
- add %o0, 0x4, %o0
- 1: cmp %o2, 0
- be,pt %XCC, 85f
- nop
- ba,pt %xcc, 90f
- nop
- 80: /* 0 < len <= 16 */
- andcc %o3, 0x3, %g0
- bne,pn %XCC, 90f
- nop
- 82:
- subcc %o2, 4, %o2
- EX_O2_4(lduwa [%o1] %asi, %g1)
- EX_O2_4(stwa %g1, [%o0] %asi)
- add %o1, 4, %o1
- bgu,pt %XCC, 82b
- add %o0, 4, %o0
- 85: retl
- clr %o0
- .align 32
- 90:
- subcc %o2, 1, %o2
- EX_O2_1(lduba [%o1] %asi, %g1)
- EX_O2_1(stba %g1, [%o0] %asi)
- add %o1, 1, %o1
- bgu,pt %XCC, 90b
- add %o0, 1, %o0
- retl
- clr %o0
- ENDPROC(___copy_in_user)
- EXPORT_SYMBOL(___copy_in_user)
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