1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
318 lines
5.8 KiB
ArmAsm
318 lines
5.8 KiB
ArmAsm
/*
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* linux/arch/arm26/lib/memcpy.S
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*
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* Copyright (C) 1995-1999 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* ASM optimised string functions
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.text
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#define ENTER \
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mov ip,sp ;\
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stmfd sp!,{r4-r9,fp,ip,lr,pc} ;\
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sub fp,ip,#4
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#define EXIT \
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LOADREGS(ea, fp, {r4 - r9, fp, sp, pc})
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#define EXITEQ \
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LOADREGS(eqea, fp, {r4 - r9, fp, sp, pc})
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/*
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* Prototype: void memcpy(void *to,const void *from,unsigned long n);
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* ARM3: cant use memcopy here!!!
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*/
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ENTRY(memcpy)
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ENTRY(memmove)
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ENTER
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cmp r1, r0
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bcc 19f
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subs r2, r2, #4
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blt 6f
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ands ip, r0, #3
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bne 7f
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ands ip, r1, #3
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bne 8f
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1: subs r2, r2, #8
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blt 5f
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subs r2, r2, #0x14
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blt 3f
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2: ldmia r1!,{r3 - r9, ip}
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stmia r0!,{r3 - r9, ip}
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subs r2, r2, #32
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bge 2b
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cmn r2, #16
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ldmgeia r1!, {r3 - r6}
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stmgeia r0!, {r3 - r6}
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subge r2, r2, #0x10
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3: adds r2, r2, #0x14
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4: ldmgeia r1!, {r3 - r5}
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stmgeia r0!, {r3 - r5}
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subges r2, r2, #12
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bge 4b
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5: adds r2, r2, #8
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blt 6f
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subs r2, r2, #4
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ldrlt r3, [r1], #4
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ldmgeia r1!, {r4, r5}
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strlt r3, [r0], #4
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stmgeia r0!, {r4, r5}
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subge r2, r2, #4
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6: adds r2, r2, #4
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EXITEQ
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cmp r2, #2
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ldrb r3, [r1], #1
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ldrgeb r4, [r1], #1
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ldrgtb r5, [r1], #1
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strb r3, [r0], #1
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strgeb r4, [r0], #1
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strgtb r5, [r0], #1
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EXIT
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7: rsb ip, ip, #4
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cmp ip, #2
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ldrb r3, [r1], #1
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ldrgeb r4, [r1], #1
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ldrgtb r5, [r1], #1
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strb r3, [r0], #1
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strgeb r4, [r0], #1
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strgtb r5, [r0], #1
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subs r2, r2, ip
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blt 6b
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ands ip, r1, #3
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beq 1b
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8: bic r1, r1, #3
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ldr r7, [r1], #4
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cmp ip, #2
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bgt 15f
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beq 11f
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cmp r2, #12
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blt 10f
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sub r2, r2, #12
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9: mov r3, r7, pull #8
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ldmia r1!, {r4 - r7}
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orr r3, r3, r4, push #24
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mov r4, r4, pull #8
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orr r4, r4, r5, push #24
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mov r5, r5, pull #8
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orr r5, r5, r6, push #24
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mov r6, r6, pull #8
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orr r6, r6, r7, push #24
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stmia r0!, {r3 - r6}
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subs r2, r2, #16
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bge 9b
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adds r2, r2, #12
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blt 100f
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10: mov r3, r7, pull #8
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ldr r7, [r1], #4
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subs r2, r2, #4
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orr r3, r3, r7, push #24
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str r3, [r0], #4
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bge 10b
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100: sub r1, r1, #3
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b 6b
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11: cmp r2, #12
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blt 13f /* */
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sub r2, r2, #12
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12: mov r3, r7, pull #16
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ldmia r1!, {r4 - r7}
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orr r3, r3, r4, push #16
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mov r4, r4, pull #16
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orr r4, r4, r5, push #16
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mov r5, r5, pull #16
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orr r5, r5, r6, push #16
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mov r6, r6, pull #16
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orr r6, r6, r7, push #16
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stmia r0!, {r3 - r6}
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subs r2, r2, #16
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bge 12b
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adds r2, r2, #12
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blt 14f
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13: mov r3, r7, pull #16
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ldr r7, [r1], #4
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subs r2, r2, #4
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orr r3, r3, r7, push #16
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str r3, [r0], #4
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bge 13b
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14: sub r1, r1, #2
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b 6b
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15: cmp r2, #12
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blt 17f
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sub r2, r2, #12
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16: mov r3, r7, pull #24
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ldmia r1!, {r4 - r7}
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orr r3, r3, r4, push #8
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mov r4, r4, pull #24
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orr r4, r4, r5, push #8
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mov r5, r5, pull #24
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orr r5, r5, r6, push #8
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mov r6, r6, pull #24
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orr r6, r6, r7, push #8
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stmia r0!, {r3 - r6}
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subs r2, r2, #16
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bge 16b
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adds r2, r2, #12
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blt 18f
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17: mov r3, r7, pull #24
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ldr r7, [r1], #4
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subs r2, r2, #4
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orr r3, r3, r7, push #8
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str r3, [r0], #4
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bge 17b
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18: sub r1, r1, #1
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b 6b
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19: add r1, r1, r2
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add r0, r0, r2
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subs r2, r2, #4
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blt 24f
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ands ip, r0, #3
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bne 25f
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ands ip, r1, #3
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bne 26f
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20: subs r2, r2, #8
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blt 23f
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subs r2, r2, #0x14
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blt 22f
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21: ldmdb r1!, {r3 - r9, ip}
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stmdb r0!, {r3 - r9, ip}
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subs r2, r2, #32
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bge 21b
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22: cmn r2, #16
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ldmgedb r1!, {r3 - r6}
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stmgedb r0!, {r3 - r6}
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subge r2, r2, #16
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adds r2, r2, #20
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ldmgedb r1!, {r3 - r5}
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stmgedb r0!, {r3 - r5}
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subge r2, r2, #12
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23: adds r2, r2, #8
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blt 24f
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subs r2, r2, #4
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ldrlt r3, [r1, #-4]!
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ldmgedb r1!, {r4, r5}
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strlt r3, [r0, #-4]!
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stmgedb r0!, {r4, r5}
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subge r2, r2, #4
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24: adds r2, r2, #4
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EXITEQ
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cmp r2, #2
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ldrb r3, [r1, #-1]!
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ldrgeb r4, [r1, #-1]!
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ldrgtb r5, [r1, #-1]!
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strb r3, [r0, #-1]!
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strgeb r4, [r0, #-1]!
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strgtb r5, [r0, #-1]!
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EXIT
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25: cmp ip, #2
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ldrb r3, [r1, #-1]!
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ldrgeb r4, [r1, #-1]!
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ldrgtb r5, [r1, #-1]!
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strb r3, [r0, #-1]!
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strgeb r4, [r0, #-1]!
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strgtb r5, [r0, #-1]!
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subs r2, r2, ip
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blt 24b
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ands ip, r1, #3
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beq 20b
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26: bic r1, r1, #3
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ldr r3, [r1], #0
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cmp ip, #2
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blt 34f
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beq 30f
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cmp r2, #12
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blt 28f
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sub r2, r2, #12
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27: mov r7, r3, push #8
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ldmdb r1!, {r3, r4, r5, r6}
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orr r7, r7, r6, pull #24
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mov r6, r6, push #8
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orr r6, r6, r5, pull #24
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mov r5, r5, push #8
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orr r5, r5, r4, pull #24
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mov r4, r4, push #8
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orr r4, r4, r3, pull #24
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stmdb r0!, {r4, r5, r6, r7}
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subs r2, r2, #16
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bge 27b
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adds r2, r2, #12
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blt 29f
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28: mov ip, r3, push #8
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ldr r3, [r1, #-4]!
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subs r2, r2, #4
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orr ip, ip, r3, pull #24
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str ip, [r0, #-4]!
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bge 28b
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29: add r1, r1, #3
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b 24b
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30: cmp r2, #12
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blt 32f
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sub r2, r2, #12
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31: mov r7, r3, push #16
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ldmdb r1!, {r3, r4, r5, r6}
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orr r7, r7, r6, pull #16
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mov r6, r6, push #16
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orr r6, r6, r5, pull #16
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mov r5, r5, push #16
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orr r5, r5, r4, pull #16
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mov r4, r4, push #16
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orr r4, r4, r3, pull #16
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stmdb r0!, {r4, r5, r6, r7}
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subs r2, r2, #16
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bge 31b
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adds r2, r2, #12
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blt 33f
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32: mov ip, r3, push #16
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ldr r3, [r1, #-4]!
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subs r2, r2, #4
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orr ip, ip, r3, pull #16
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str ip, [r0, #-4]!
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bge 32b
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33: add r1, r1, #2
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b 24b
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34: cmp r2, #12
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blt 36f
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sub r2, r2, #12
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35: mov r7, r3, push #24
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ldmdb r1!, {r3, r4, r5, r6}
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orr r7, r7, r6, pull #8
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mov r6, r6, push #24
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orr r6, r6, r5, pull #8
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mov r5, r5, push #24
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orr r5, r5, r4, pull #8
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mov r4, r4, push #24
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orr r4, r4, r3, pull #8
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stmdb r0!, {r4, r5, r6, r7}
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subs r2, r2, #16
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bge 35b
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adds r2, r2, #12
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blt 37f
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36: mov ip, r3, push #24
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ldr r3, [r1, #-4]!
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subs r2, r2, #4
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orr ip, ip, r3, pull #8
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str ip, [r0, #-4]!
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bge 36b
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37: add r1, r1, #1
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b 24b
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.align
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