1 /* SPDX-License-Identifier: GPL-2.0-only */ !! 1 /* memmove.S: Simple memmove implementation. 2 /* << 3 * linux/arch/arm/lib/memmove.S << 4 * 2 * 5 * Author: Nicolas Pitre !! 3 * Copyright (C) 1997, 2004 David S. Miller (davem@redhat.com) 6 * Created: Sep 28, 2005 !! 4 * Copyright (C) 1996, 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz) 7 * Copyright: (C) MontaVista Software Inc. << 8 */ 5 */ 9 6 10 #include <linux/linkage.h> !! 7 .text 11 #include <asm/assembler.h> !! 8 .align 32 12 #include <asm/unwind.h> !! 9 .globl memmove 13 !! 10 .type memmove,#function 14 .text !! 11 memmove: /* o0=dst o1=src o2=len */ 15 !! 12 mov %o0, %g1 16 /* !! 13 cmp %o0, %o1 17 * Prototype: void *memmove(void *dest, const !! 14 bleu,pt %xcc, memcpy 18 * !! 15 add %o1, %o2, %g7 19 * Note: !! 16 cmp %g7, %o0 20 * !! 17 bleu,pt %xcc, memcpy 21 * If the memory regions don't overlap, we sim !! 18 add %o0, %o2, %o5 22 * normally a bit faster. Otherwise the copy i !! 19 sub %g7, 1, %o1 23 * is a transposition of the code from copy_te !! 20 24 * occurring in the opposite direction. !! 21 sub %o5, 1, %o0 25 */ !! 22 1: ldub [%o1], %g7 26 !! 23 subcc %o2, 1, %o2 27 ENTRY(__memmove) !! 24 sub %o1, 1, %o1 28 WEAK(memmove) !! 25 stb %g7, [%o0] 29 UNWIND( .fnstart !! 26 bne,pt %icc, 1b 30 !! 27 sub %o0, 1, %o0 31 subs ip, r0, r1 !! 28 32 cmphi r2, ip !! 29 retl 33 bls __memcpy !! 30 mov %g1, %o0 34 UNWIND( .fnend !! 31 .size memmove, .-memmove 35 << 36 UNWIND( .fnstart << 37 UNWIND( .save {r0, r4, fpreg, lr} << 38 stmfd sp!, {r0, r4, UNWIND(f << 39 UNWIND( .setfp fpreg, sp << 40 UNWIND( mov fpreg, sp << 41 add r1, r1, r2 << 42 add r0, r0, r2 << 43 subs r2, r2, #4 << 44 blt 8f << 45 ands ip, r0, #3 << 46 PLD( pld [r1, #-4] << 47 bne 9f << 48 ands ip, r1, #3 << 49 bne 10f << 50 << 51 1: subs r2, r2, #(28) << 52 stmfd sp!, {r5, r6, r8, r9} << 53 blt 5f << 54 << 55 CALGN( ands ip, r0, #31 << 56 CALGN( sbcsne r4, ip, r2 << 57 CALGN( bcs 2f << 58 CALGN( adr r4, 6f << 59 CALGN( subs r2, r2, ip << 60 CALGN( rsb ip, ip, #32 << 61 CALGN( add pc, r4, ip << 62 << 63 PLD( pld [r1, #-4] << 64 2: PLD( subs r2, r2, #96 << 65 PLD( pld [r1, #-32] << 66 PLD( blt 4f << 67 PLD( pld [r1, #-64] << 68 PLD( pld [r1, #-96] << 69 << 70 3: PLD( pld [r1, #-128] << 71 4: ldmdb r1!, {r3, r4, r5, r6, << 72 subs r2, r2, #32 << 73 stmdb r0!, {r3, r4, r5, r6, << 74 bge 3b << 75 PLD( cmn r2, #96 << 76 PLD( bge 4b << 77 << 78 5: ands ip, r2, #28 << 79 rsb ip, ip, #32 << 80 addne pc, pc, ip << 81 b 7f << 82 6: W(nop) << 83 W(ldr) r3, [r1, #-4]! << 84 W(ldr) r4, [r1, #-4]! << 85 W(ldr) r5, [r1, #-4]! << 86 W(ldr) r6, [r1, #-4]! << 87 W(ldr) r8, [r1, #-4]! << 88 W(ldr) r9, [r1, #-4]! << 89 W(ldr) lr, [r1, #-4]! << 90 << 91 add pc, pc, ip << 92 nop << 93 W(nop) << 94 W(str) r3, [r0, #-4]! << 95 W(str) r4, [r0, #-4]! << 96 W(str) r5, [r0, #-4]! << 97 W(str) r6, [r0, #-4]! << 98 W(str) r8, [r0, #-4]! << 99 W(str) r9, [r0, #-4]! << 100 W(str) lr, [r0, #-4]! << 101 << 102 CALGN( bcs 2b << 103 << 104 7: ldmfd sp!, {r5, r6, r8, r9} << 105 << 106 8: movs r2, r2, lsl #31 << 107 ldrbne r3, [r1, #-1]! << 108 ldrbcs r4, [r1, #-1]! << 109 ldrbcs ip, [r1, #-1] << 110 strbne r3, [r0, #-1]! << 111 strbcs r4, [r0, #-1]! << 112 strbcs ip, [r0, #-1] << 113 ldmfd sp!, {r0, r4, UNWIND(f << 114 << 115 9: cmp ip, #2 << 116 ldrbgt r3, [r1, #-1]! << 117 ldrbge r4, [r1, #-1]! << 118 ldrb lr, [r1, #-1]! << 119 strbgt r3, [r0, #-1]! << 120 strbge r4, [r0, #-1]! << 121 subs r2, r2, ip << 122 strb lr, [r0, #-1]! << 123 blt 8b << 124 ands ip, r1, #3 << 125 beq 1b << 126 << 127 10: bic r1, r1, #3 << 128 cmp ip, #2 << 129 ldr r3, [r1, #0] << 130 beq 17f << 131 blt 18f << 132 << 133 << 134 .macro backward_copy_shift pu << 135 << 136 subs r2, r2, #28 << 137 blt 14f << 138 << 139 CALGN( ands ip, r0, #31 << 140 CALGN( sbcsne r4, ip, r2 << 141 CALGN( subcc r2, r2, ip << 142 CALGN( bcc 15f << 143 << 144 11: stmfd sp!, {r5, r6, r8 - r10 << 145 << 146 PLD( pld [r1, #-4] << 147 PLD( subs r2, r2, #96 << 148 PLD( pld [r1, #-32] << 149 PLD( blt 13f << 150 PLD( pld [r1, #-64] << 151 PLD( pld [r1, #-96] << 152 << 153 12: PLD( pld [r1, #-128] << 154 13: ldmdb r1!, {r8, r9, r10, ip} << 155 mov lr, r3, lspush #\push << 156 subs r2, r2, #32 << 157 ldmdb r1!, {r3, r4, r5, r6} << 158 orr lr, lr, ip, lspull #\p << 159 mov ip, ip, lspush #\push << 160 orr ip, ip, r10, lspull #\ << 161 mov r10, r10, lspush #\pus << 162 orr r10, r10, r9, lspull # << 163 mov r9, r9, lspush #\push << 164 orr r9, r9, r8, lspull #\p << 165 mov r8, r8, lspush #\push << 166 orr r8, r8, r6, lspull #\p << 167 mov r6, r6, lspush #\push << 168 orr r6, r6, r5, lspull #\p << 169 mov r5, r5, lspush #\push << 170 orr r5, r5, r4, lspull #\p << 171 mov r4, r4, lspush #\push << 172 orr r4, r4, r3, lspull #\p << 173 stmdb r0!, {r4 - r6, r8 - r1 << 174 bge 12b << 175 PLD( cmn r2, #96 << 176 PLD( bge 13b << 177 << 178 ldmfd sp!, {r5, r6, r8 - r10 << 179 << 180 14: ands ip, r2, #28 << 181 beq 16f << 182 << 183 15: mov lr, r3, lspush #\push << 184 ldr r3, [r1, #-4]! << 185 subs ip, ip, #4 << 186 orr lr, lr, r3, lspull #\p << 187 str lr, [r0, #-4]! << 188 bgt 15b << 189 CALGN( cmp r2, #0 << 190 CALGN( bge 11b << 191 << 192 16: add r1, r1, #(\pull / 8) << 193 b 8b << 194 << 195 .endm << 196 << 197 << 198 backward_copy_shift push=8 << 199 << 200 17: backward_copy_shift push=1 << 201 << 202 18: backward_copy_shift push=2 << 203 << 204 UNWIND( .fnend << 205 ENDPROC(memmove) << 206 ENDPROC(__memmove) <<
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