| /* 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> |
| |
| #define XCC xcc |
| |
| #define EX(x,y) \ |
| 98: x,y; \ |
| .section __ex_table,"a";\ |
| .align 4; \ |
| .word 98b, __retl_one; \ |
| .text; \ |
| .align 4; |
| |
| .register %g2,#scratch |
| .register %g3,#scratch |
| |
| .text |
| .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(ldxa [%o1] %asi, %o5) |
| EX(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(lduwa [%o1] %asi, %o5) |
| EX(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(lduwa [%o1] %asi, %g1) |
| EX(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(lduba [%o1] %asi, %g1) |
| EX(stba %g1, [%o0] %asi) |
| add %o1, 1, %o1 |
| bgu,pt %XCC, 90b |
| add %o0, 1, %o0 |
| retl |
| clr %o0 |
| ENDPROC(___copy_in_user) |
