Quelle  copy_mc_64.S

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) IBM Corporation, 2011
 * Derived from copyuser_power7.s by Anton Blanchard <anton@au.ibm.com>
 * Author - Balbir Singh <bsingharora@gmail.com>
 */
#include <linux/export.h>
#include <asm/ppc_asm.h>
#include <asm/errno.h>

 .macro err1
100:
 EX_TABLE(100b,.Ldo_err1)
 .endm

 .macro err2
200:
 EX_TABLE(200b,.Ldo_err2)
 .endm

 .macro err3
300: EX_TABLE(300b,.Ldone)
 .endm

.Ldo_err2:
 ld r22,STK_REG(R22)(r1)
 ld r21,STK_REG(R21)(r1)
 ld r20,STK_REG(R20)(r1)
 ld r19,STK_REG(R19)(r1)
 ld r18,STK_REG(R18)(r1)
 ld r17,STK_REG(R17)(r1)
 ld r16,STK_REG(R16)(r1)
 ld r15,STK_REG(R15)(r1)
 ld r14,STK_REG(R14)(r1)
 addi r1,r1,STACKFRAMESIZE
.Ldo_err1:
 /* Do a byte by byte copy to get the exact remaining size */
 mtctr r7
46:
err3; lbz r0,0(r4)
 addi r4,r4,1
err3; stb r0,0(r3)
 addi r3,r3,1
 bdnz 46b
 li r3,0
 blr

.Ldone:
 mfctr r3
 blr


_GLOBAL(copy_mc_generic)
 mr r7,r5
 cmpldi r5,16
 blt .Lshort_copy

.Lcopy:
 /* Get the source 8B aligned */
 neg r6,r4
 mtocrf 0x01,r6
 clrldi r6,r6,(64-3)

 bf cr7*4+3,1f
err1; lbz r0,0(r4)
 addi r4,r4,1
err1; stb r0,0(r3)
 addi r3,r3,1
 subi r7,r7,1

1: bf cr7*4+2,2f
err1; lhz r0,0(r4)
 addi r4,r4,2
err1; sth r0,0(r3)
 addi r3,r3,2
 subi r7,r7,2

2: bf cr7*4+1,3f
err1; lwz r0,0(r4)
 addi r4,r4,4
err1; stw r0,0(r3)
 addi r3,r3,4
 subi r7,r7,4

3: sub r5,r5,r6
 cmpldi r5,128

 mflr r0
 stdu r1,-STACKFRAMESIZE(r1)
 std r14,STK_REG(R14)(r1)
 std r15,STK_REG(R15)(r1)
 std r16,STK_REG(R16)(r1)
 std r17,STK_REG(R17)(r1)
 std r18,STK_REG(R18)(r1)
 std r19,STK_REG(R19)(r1)
 std r20,STK_REG(R20)(r1)
 std r21,STK_REG(R21)(r1)
 std r22,STK_REG(R22)(r1)
 std r0,STACKFRAMESIZE+16(r1)

 blt 5f
 srdi r6,r5,7
 mtctr r6

 /* Now do cacheline (128B) sized loads and stores. */
 .align 5
4:
err2; ld r0,0(r4)
err2; ld r6,8(r4)
err2; ld r8,16(r4)
err2; ld r9,24(r4)
err2; ld r10,32(r4)
err2; ld r11,40(r4)
err2; ld r12,48(r4)
err2; ld r14,56(r4)
err2; ld r15,64(r4)
err2; ld r16,72(r4)
err2; ld r17,80(r4)
err2; ld r18,88(r4)
err2; ld r19,96(r4)
err2; ld r20,104(r4)
err2; ld r21,112(r4)
err2; ld r22,120(r4)
 addi r4,r4,128
err2; std r0,0(r3)
err2; std r6,8(r3)
err2; std r8,16(r3)
err2; std r9,24(r3)
err2; std r10,32(r3)
err2; std r11,40(r3)
err2; std r12,48(r3)
err2; std r14,56(r3)
err2; std r15,64(r3)
err2; std r16,72(r3)
err2; std r17,80(r3)
err2; std r18,88(r3)
err2; std r19,96(r3)
err2; std r20,104(r3)
err2; std r21,112(r3)
err2; std r22,120(r3)
 addi r3,r3,128
 subi r7,r7,128
 bdnz 4b

 clrldi r5,r5,(64-7)

 /* Up to 127B to go */
5: srdi r6,r5,4
 mtocrf 0x01,r6

6: bf cr7*4+1,7f
err2; ld r0,0(r4)
err2; ld r6,8(r4)
err2; ld r8,16(r4)
err2; ld r9,24(r4)
err2; ld r10,32(r4)
err2; ld r11,40(r4)
err2; ld r12,48(r4)
err2; ld r14,56(r4)
 addi r4,r4,64
err2; std r0,0(r3)
err2; std r6,8(r3)
err2; std r8,16(r3)
err2; std r9,24(r3)
err2; std r10,32(r3)
err2; std r11,40(r3)
err2; std r12,48(r3)
err2; std r14,56(r3)
 addi r3,r3,64
 subi r7,r7,64

7: ld r14,STK_REG(R14)(r1)
 ld r15,STK_REG(R15)(r1)
 ld r16,STK_REG(R16)(r1)
 ld r17,STK_REG(R17)(r1)
 ld r18,STK_REG(R18)(r1)
 ld r19,STK_REG(R19)(r1)
 ld r20,STK_REG(R20)(r1)
 ld r21,STK_REG(R21)(r1)
 ld r22,STK_REG(R22)(r1)
 addi r1,r1,STACKFRAMESIZE

 /* Up to 63B to go */
 bf cr7*4+2,8f
err1; ld r0,0(r4)
err1; ld r6,8(r4)
err1; ld r8,16(r4)
err1; ld r9,24(r4)
 addi r4,r4,32
err1; std r0,0(r3)
err1; std r6,8(r3)
err1; std r8,16(r3)
err1; std r9,24(r3)
 addi r3,r3,32
 subi r7,r7,32

 /* Up to 31B to go */
8: bf cr7*4+3,9f
err1; ld r0,0(r4)
err1; ld r6,8(r4)
 addi r4,r4,16
err1; std r0,0(r3)
err1; std r6,8(r3)
 addi r3,r3,16
 subi r7,r7,16

9: clrldi r5,r5,(64-4)

 /* Up to 15B to go */
.Lshort_copy:
 mtocrf 0x01,r5
 bf cr7*4+0,12f
err1; lwz r0,0(r4) /* Less chance of a reject with word ops */
err1; lwz r6,4(r4)
 addi r4,r4,8
err1; stw r0,0(r3)
err1; stw r6,4(r3)
 addi r3,r3,8
 subi r7,r7,8

12: bf cr7*4+1,13f
err1; lwz r0,0(r4)
 addi r4,r4,4
err1; stw r0,0(r3)
 addi r3,r3,4
 subi r7,r7,4

13: bf cr7*4+2,14f
err1; lhz r0,0(r4)
 addi r4,r4,2
err1; sth r0,0(r3)
 addi r3,r3,2
 subi r7,r7,2

14: bf cr7*4+3,15f
err1; lbz r0,0(r4)
err1; stb r0,0(r3)

15: li r3,0
 blr

EXPORT_SYMBOL_GPL(copy_mc_generic);