diff options
Diffstat (limited to 'arch/powerpc/lib/mem_64.S')
-rw-r--r-- | arch/powerpc/lib/mem_64.S | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/arch/powerpc/lib/mem_64.S b/arch/powerpc/lib/mem_64.S new file mode 100644 index 0000000000..6fd06cd20f --- /dev/null +++ b/arch/powerpc/lib/mem_64.S @@ -0,0 +1,142 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * String handling functions for PowerPC. + * + * Copyright (C) 1996 Paul Mackerras. + */ +#include <linux/export.h> +#include <asm/processor.h> +#include <asm/errno.h> +#include <asm/ppc_asm.h> +#include <asm/kasan.h> + +#ifndef CONFIG_KASAN +_GLOBAL(__memset16) + rlwimi r4,r4,16,0,15 + /* fall through */ + +_GLOBAL(__memset32) + rldimi r4,r4,32,0 + /* fall through */ + +_GLOBAL(__memset64) + neg r0,r3 + andi. r0,r0,7 + cmplw cr1,r5,r0 + b .Lms +EXPORT_SYMBOL(__memset16) +EXPORT_SYMBOL(__memset32) +EXPORT_SYMBOL(__memset64) +#endif + +_GLOBAL_KASAN(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 +.Lms: 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 + .balign 16 +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 +EXPORT_SYMBOL(memset) +EXPORT_SYMBOL_KASAN(memset) + +_GLOBAL_TOC_KASAN(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 + .balign 16 +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 +EXPORT_SYMBOL(memmove) +EXPORT_SYMBOL_KASAN(memmove) |