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- /*
- * String handling functions for PowerPC.
- *
- * Copyright (C) 1996 Paul Mackerras.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #include <asm/processor.h>
- #include <asm/errno.h>
- #include <asm/ppc_asm.h>
- _GLOBAL(memset)
- neg r0,r3
- rlwimi r4,r4,8,16,23
- andi. r0,r0,7 /* # bytes to be 8-byte aligned */
- rlwimi r4,r4,16,0,15
- cmplw cr1,r5,r0 /* do we get that far? */
- rldimi r4,r4,32,0
- PPC_MTOCRF(1,r0)
- mr r6,r3
- blt cr1,8f
- beq+ 3f /* if already 8-byte aligned */
- subf r5,r0,r5
- bf 31,1f
- stb r4,0(r6)
- addi r6,r6,1
- 1: bf 30,2f
- sth r4,0(r6)
- addi r6,r6,2
- 2: bf 29,3f
- stw r4,0(r6)
- addi r6,r6,4
- 3: srdi. r0,r5,6
- clrldi r5,r5,58
- mtctr r0
- beq 5f
- 4: std r4,0(r6)
- std r4,8(r6)
- std r4,16(r6)
- std r4,24(r6)
- std r4,32(r6)
- std r4,40(r6)
- std r4,48(r6)
- std r4,56(r6)
- addi r6,r6,64
- bdnz 4b
- 5: srwi. r0,r5,3
- clrlwi r5,r5,29
- PPC_MTOCRF(1,r0)
- beq 8f
- bf 29,6f
- std r4,0(r6)
- std r4,8(r6)
- std r4,16(r6)
- std r4,24(r6)
- addi r6,r6,32
- 6: bf 30,7f
- std r4,0(r6)
- std r4,8(r6)
- addi r6,r6,16
- 7: bf 31,8f
- std r4,0(r6)
- addi r6,r6,8
- 8: cmpwi r5,0
- PPC_MTOCRF(1,r5)
- beqlr+
- bf 29,9f
- stw r4,0(r6)
- addi r6,r6,4
- 9: bf 30,10f
- sth r4,0(r6)
- addi r6,r6,2
- 10: bflr 31
- stb r4,0(r6)
- blr
- _GLOBAL_TOC(memmove)
- cmplw 0,r3,r4
- bgt backwards_memcpy
- b memcpy
- _GLOBAL(backwards_memcpy)
- rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */
- add r6,r3,r5
- add r4,r4,r5
- beq 2f
- andi. r0,r6,3
- mtctr r7
- bne 5f
- 1: lwz r7,-4(r4)
- lwzu r8,-8(r4)
- stw r7,-4(r6)
- stwu r8,-8(r6)
- bdnz 1b
- andi. r5,r5,7
- 2: cmplwi 0,r5,4
- blt 3f
- lwzu r0,-4(r4)
- subi r5,r5,4
- stwu r0,-4(r6)
- 3: cmpwi 0,r5,0
- beqlr
- mtctr r5
- 4: lbzu r0,-1(r4)
- stbu r0,-1(r6)
- bdnz 4b
- blr
- 5: mtctr r0
- 6: lbzu r7,-1(r4)
- stbu r7,-1(r6)
- bdnz 6b
- subf r5,r0,r5
- rlwinm. r7,r5,32-3,3,31
- beq 2b
- mtctr r7
- b 1b
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