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https://github.com/edk2-porting/linux-next.git
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59fd6b8cc0
I noticed, when trying to use, e.g., node = find_node_by_prop_value(prev, "booleanprop", "", 0)) to search for all nodes with a certain boolean property, that memcmp() returns garbage when comparing zero bytes. It should return zero. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
270 lines
3.7 KiB
ArmAsm
270 lines
3.7 KiB
ArmAsm
/*
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* Copyright (C) Paul Mackerras 1997.
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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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* NOTE: this code runs in 32 bit mode and is packaged as ELF32.
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*/
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#include "ppc_asm.h"
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.text
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.globl strcpy
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strcpy:
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addi r5,r3,-1
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addi r4,r4,-1
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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stbu r0,1(r5)
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bne 1b
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blr
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.globl strncpy
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strncpy:
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cmpwi 0,r5,0
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beqlr
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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 r0,1(r4)
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cmpwi 0,r0,0
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stbu r0,1(r6)
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bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */
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blr
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.globl strcat
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strcat:
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addi r5,r3,-1
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addi r4,r4,-1
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1: lbzu r0,1(r5)
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cmpwi 0,r0,0
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bne 1b
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addi r5,r5,-1
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1: lbzu r0,1(r4)
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cmpwi 0,r0,0
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stbu r0,1(r5)
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bne 1b
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blr
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.globl strchr
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strchr:
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addi r3,r3,-1
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1: lbzu r0,1(r3)
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cmpw 0,r0,r4
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beqlr
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cmpwi 0,r0,0
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bne 1b
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li r3,0
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blr
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.globl strcmp
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strcmp:
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addi r5,r3,-1
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addi r4,r4,-1
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1: lbzu r3,1(r5)
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cmpwi 1,r3,0
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lbzu r0,1(r4)
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subf. r3,r0,r3
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beqlr 1
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beq 1b
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blr
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.globl strncmp
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strncmp:
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mtctr r5
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addi r5,r3,-1
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addi r4,r4,-1
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1: lbzu r3,1(r5)
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cmpwi 1,r3,0
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lbzu r0,1(r4)
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subf. r3,r0,r3
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beqlr 1
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bdnzt eq,1b
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blr
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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 /* r7 = r5 >> 3 */
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addi r6,r3,-4
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addi r4,r4,-4
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beq 3f /* 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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andi. r0,r4,3 /* check src word aligned too */
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bne 3f
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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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cmpw cr1,r0,r5
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add r7,r0,r4
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andi. r7,r7,3 /* will source be word-aligned too? */
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ble cr1,3b
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bne 3b /* do byte-by-byte if not */
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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 /* r7 = r5 >> 3 */
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add r6,r3,r5
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add r4,r4,r5
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beq 3f
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andi. r0,r6,3
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mtctr r7
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bne 5f
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andi. r0,r4,3
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bne 3f
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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: cmpw cr1,r0,r5
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subf r7,r0,r4
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andi. r7,r7,3
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ble cr1,3b
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bne 3b
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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 memchr
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memchr:
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cmpwi 0,r5,0
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blelr
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mtctr r5
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addi r3,r3,-1
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1: lbzu r0,1(r3)
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cmpw r0,r4
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beqlr
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bdnz 1b
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li r3,0
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blr
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.globl memcmp
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memcmp:
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cmpwi 0,r5,0
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ble 2f
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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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2: li r3,0
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blr
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/*
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* Flush the dcache and invalidate the icache for a range of addresses.
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*
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* flush_cache(addr, len)
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*/
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.global flush_cache
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flush_cache:
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addi 4,4,0x1f /* len = (len + 0x1f) / 0x20 */
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rlwinm. 4,4,27,5,31
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mtctr 4
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beqlr
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1: dcbf 0,3
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icbi 0,3
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addi 3,3,0x20
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bdnz 1b
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sync
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isync
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blr
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