copy_in_user.S (2068B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* copy_in_user.S: Copy from userspace to userspace. 3 * 4 * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com) 5 */ 6 7#include <linux/linkage.h> 8#include <asm/asi.h> 9#include <asm/export.h> 10 11#define XCC xcc 12 13#define EX(x,y,z) \ 1498: x,y; \ 15 .section __ex_table,"a";\ 16 .align 4; \ 17 .word 98b, z; \ 18 .text; \ 19 .align 4; 20 21#define EX_O4(x,y) EX(x,y,__retl_o4_plus_8) 22#define EX_O2_4(x,y) EX(x,y,__retl_o2_plus_4) 23#define EX_O2_1(x,y) EX(x,y,__retl_o2_plus_1) 24 25 .register %g2,#scratch 26 .register %g3,#scratch 27 28 .text 29__retl_o4_plus_8: 30 add %o4, %o2, %o4 31 retl 32 add %o4, 8, %o0 33__retl_o2_plus_4: 34 retl 35 add %o2, 4, %o0 36__retl_o2_plus_1: 37 retl 38 add %o2, 1, %o0 39 40 .align 32 41 42 /* Don't try to get too fancy here, just nice and 43 * simple. This is predominantly used for well aligned 44 * small copies in the compat layer. It is also used 45 * to copy register windows around during thread cloning. 46 */ 47 48ENTRY(raw_copy_in_user) /* %o0=dst, %o1=src, %o2=len */ 49 cmp %o2, 0 50 be,pn %XCC, 85f 51 or %o0, %o1, %o3 52 cmp %o2, 16 53 bleu,a,pn %XCC, 80f 54 or %o3, %o2, %o3 55 56 /* 16 < len <= 64 */ 57 andcc %o3, 0x7, %g0 58 bne,pn %XCC, 90f 59 nop 60 61 andn %o2, 0x7, %o4 62 and %o2, 0x7, %o2 631: subcc %o4, 0x8, %o4 64 EX_O4(ldxa [%o1] %asi, %o5) 65 EX_O4(stxa %o5, [%o0] %asi) 66 add %o1, 0x8, %o1 67 bgu,pt %XCC, 1b 68 add %o0, 0x8, %o0 69 andcc %o2, 0x4, %g0 70 be,pt %XCC, 1f 71 nop 72 sub %o2, 0x4, %o2 73 EX_O2_4(lduwa [%o1] %asi, %o5) 74 EX_O2_4(stwa %o5, [%o0] %asi) 75 add %o1, 0x4, %o1 76 add %o0, 0x4, %o0 771: cmp %o2, 0 78 be,pt %XCC, 85f 79 nop 80 ba,pt %xcc, 90f 81 nop 82 8380: /* 0 < len <= 16 */ 84 andcc %o3, 0x3, %g0 85 bne,pn %XCC, 90f 86 nop 87 8882: 89 subcc %o2, 4, %o2 90 EX_O2_4(lduwa [%o1] %asi, %g1) 91 EX_O2_4(stwa %g1, [%o0] %asi) 92 add %o1, 4, %o1 93 bgu,pt %XCC, 82b 94 add %o0, 4, %o0 95 9685: retl 97 clr %o0 98 99 .align 32 10090: 101 subcc %o2, 1, %o2 102 EX_O2_1(lduba [%o1] %asi, %g1) 103 EX_O2_1(stba %g1, [%o0] %asi) 104 add %o1, 1, %o1 105 bgu,pt %XCC, 90b 106 add %o0, 1, %o0 107 retl 108 clr %o0 109ENDPROC(raw_copy_in_user) 110EXPORT_SYMBOL(raw_copy_in_user)