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| /* SPDX-License-Identifier: GPL-2.0 */
| /* 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(raw_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(raw_copy_in_user)
| EXPORT_SYMBOL(raw_copy_in_user)
|
|
