151 lines
2.2 KiB
ArmAsm
151 lines
2.2 KiB
ArmAsm
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/*
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* String handling functions for PowerPC.
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*
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* Copyright (C) 1996 Paul Mackerras.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define r0 0
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#define r3 3
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#define r4 4
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#define r5 5
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#define r6 6
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#define r7 7
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#define r8 8
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.globl strlen
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strlen:
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addi r4,r3,-1
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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bne 1b
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subf r3,r3,r4
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blr
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.globl memset
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memset:
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rlwimi r4,r4,8,16,23
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rlwimi r4,r4,16,0,15
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addi r6,r3,-4
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cmplwi 0,r5,4
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blt 7f
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stwu r4,4(r6)
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beqlr
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andi. r0,r6,3
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add r5,r0,r5
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subf r6,r0,r6
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rlwinm r0,r5,32-2,2,31
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mtctr r0
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bdz 6f
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1: stwu r4,4(r6)
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bdnz 1b
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6: andi. r5,r5,3
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7: cmpwi 0,r5,0
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beqlr
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mtctr r5
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addi r6,r6,3
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8: stbu r4,1(r6)
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bdnz 8b
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blr
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.globl memmove
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memmove:
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cmplw 0,r3,r4
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bgt backwards_memcpy
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/* fall through */
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.globl memcpy
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memcpy:
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rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */
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addi r6,r3,-4
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addi r4,r4,-4
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beq 2f /* if less than 8 bytes to do */
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andi. r0,r6,3 /* get dest word aligned */
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mtctr r7
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bne 5f
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1: lwz r7,4(r4)
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lwzu r8,8(r4)
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stw r7,4(r6)
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stwu r8,8(r6)
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bdnz 1b
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andi. r5,r5,7
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2: cmplwi 0,r5,4
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blt 3f
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lwzu r0,4(r4)
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addi r5,r5,-4
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stwu r0,4(r6)
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3: cmpwi 0,r5,0
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beqlr
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mtctr r5
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addi r4,r4,3
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addi r6,r6,3
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4: lbzu r0,1(r4)
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stbu r0,1(r6)
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bdnz 4b
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blr
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5: subfic r0,r0,4
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mtctr r0
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6: lbz r7,4(r4)
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addi r4,r4,1
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stb r7,4(r6)
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addi r6,r6,1
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bdnz 6b
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subf r5,r0,r5
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rlwinm. r7,r5,32-3,3,31
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beq 2b
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mtctr r7
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b 1b
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.globl backwards_memcpy
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backwards_memcpy:
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rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */
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add r6,r3,r5
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add r4,r4,r5
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beq 2f
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andi. r0,r6,3
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mtctr r7
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bne 5f
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1: lwz r7,-4(r4)
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lwzu r8,-8(r4)
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stw r7,-4(r6)
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stwu r8,-8(r6)
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bdnz 1b
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andi. r5,r5,7
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2: cmplwi 0,r5,4
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blt 3f
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lwzu r0,-4(r4)
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subi r5,r5,4
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stwu r0,-4(r6)
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3: cmpwi 0,r5,0
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beqlr
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mtctr r5
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4: lbzu r0,-1(r4)
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stbu r0,-1(r6)
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bdnz 4b
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blr
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5: mtctr r0
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6: lbzu r7,-1(r4)
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stbu r7,-1(r6)
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bdnz 6b
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subf r5,r0,r5
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rlwinm. r7,r5,32-3,3,31
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beq 2b
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mtctr r7
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b 1b
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.globl memcmp
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memcmp:
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cmpwi 0,r5,0
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blelr
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mtctr r5
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addi r6,r3,-1
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addi r4,r4,-1
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1: lbzu r3,1(r6)
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lbzu r0,1(r4)
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subf. r3,r0,r3
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bdnzt 2,1b
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blr
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