forked from Minki/linux
b4c6afdc3a
generic_memcpy() is only called from copy_32.S, so there's no reason for it to be global. Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
510 lines
9.5 KiB
ArmAsm
510 lines
9.5 KiB
ArmAsm
/*
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* Memory copy functions for 32-bit PowerPC.
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*
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* Copyright (C) 1996-2005 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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#include <asm/processor.h>
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#include <asm/cache.h>
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#include <asm/errno.h>
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#include <asm/ppc_asm.h>
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#define COPY_16_BYTES \
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lwz r7,4(r4); \
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lwz r8,8(r4); \
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lwz r9,12(r4); \
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lwzu r10,16(r4); \
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stw r7,4(r6); \
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stw r8,8(r6); \
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stw r9,12(r6); \
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stwu r10,16(r6)
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#define COPY_16_BYTES_WITHEX(n) \
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8 ## n ## 0: \
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lwz r7,4(r4); \
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8 ## n ## 1: \
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lwz r8,8(r4); \
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8 ## n ## 2: \
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lwz r9,12(r4); \
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8 ## n ## 3: \
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lwzu r10,16(r4); \
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8 ## n ## 4: \
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stw r7,4(r6); \
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8 ## n ## 5: \
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stw r8,8(r6); \
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8 ## n ## 6: \
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stw r9,12(r6); \
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8 ## n ## 7: \
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stwu r10,16(r6)
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#define COPY_16_BYTES_EXCODE(n) \
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9 ## n ## 0: \
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addi r5,r5,-(16 * n); \
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b 104f; \
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9 ## n ## 1: \
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addi r5,r5,-(16 * n); \
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b 105f; \
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.section __ex_table,"a"; \
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.align 2; \
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.long 8 ## n ## 0b,9 ## n ## 0b; \
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.long 8 ## n ## 1b,9 ## n ## 0b; \
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.long 8 ## n ## 2b,9 ## n ## 0b; \
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.long 8 ## n ## 3b,9 ## n ## 0b; \
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.long 8 ## n ## 4b,9 ## n ## 1b; \
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.long 8 ## n ## 5b,9 ## n ## 1b; \
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.long 8 ## n ## 6b,9 ## n ## 1b; \
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.long 8 ## n ## 7b,9 ## n ## 1b; \
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.text
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.text
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.stabs "arch/powerpc/lib/",N_SO,0,0,0f
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.stabs "copy_32.S",N_SO,0,0,0f
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0:
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CACHELINE_BYTES = L1_CACHE_BYTES
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LG_CACHELINE_BYTES = L1_CACHE_SHIFT
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CACHELINE_MASK = (L1_CACHE_BYTES-1)
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/*
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* Use dcbz on the complete cache lines in the destination
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* to set them to zero. This requires that the destination
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* area is cacheable. -- paulus
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*
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* During early init, cache might not be active yet, so dcbz cannot be used.
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* We therefore skip the optimised bloc that uses dcbz. This jump is
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* replaced by a nop once cache is active. This is done in machine_init()
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*/
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_GLOBAL(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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cmplwi 0,r4,0
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bne 2f /* Use normal procedure if r4 is not zero */
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_GLOBAL(memset_nocache_branch)
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b 2f /* Skip optimised bloc until cache is enabled */
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clrlwi r7,r6,32-LG_CACHELINE_BYTES
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add r8,r7,r5
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srwi r9,r8,LG_CACHELINE_BYTES
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addic. r9,r9,-1 /* total number of complete cachelines */
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ble 2f
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xori r0,r7,CACHELINE_MASK & ~3
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srwi. r0,r0,2
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beq 3f
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mtctr r0
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4: stwu r4,4(r6)
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bdnz 4b
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3: mtctr r9
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li r7,4
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10: dcbz r7,r6
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addi r6,r6,CACHELINE_BYTES
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bdnz 10b
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clrlwi r5,r8,32-LG_CACHELINE_BYTES
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addi r5,r5,4
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2: srwi r0,r5,2
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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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/*
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* This version uses dcbz on the complete cache lines in the
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* destination area to reduce memory traffic. This requires that
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* the destination area is cacheable.
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* We only use this version if the source and dest don't overlap.
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* -- paulus.
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*
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* During early init, cache might not be active yet, so dcbz cannot be used.
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* We therefore jump to generic_memcpy which doesn't use dcbz. This jump is
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* replaced by a nop once cache is active. This is done in machine_init()
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*/
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_GLOBAL(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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_GLOBAL(memcpy)
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b generic_memcpy
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add r7,r3,r5 /* test if the src & dst overlap */
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add r8,r4,r5
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cmplw 0,r4,r7
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cmplw 1,r3,r8
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crand 0,0,4 /* cr0.lt &= cr1.lt */
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blt generic_memcpy /* if regions overlap */
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addi r4,r4,-4
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addi r6,r3,-4
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neg r0,r3
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andi. r0,r0,CACHELINE_MASK /* # bytes to start of cache line */
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beq 58f
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cmplw 0,r5,r0 /* is this more than total to do? */
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blt 63f /* if not much to do */
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andi. r8,r0,3 /* get it word-aligned first */
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subf r5,r0,r5
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mtctr r8
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beq+ 61f
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70: lbz r9,4(r4) /* do some bytes */
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addi r4,r4,1
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addi r6,r6,1
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stb r9,3(r6)
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bdnz 70b
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61: srwi. r0,r0,2
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mtctr r0
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beq 58f
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72: lwzu r9,4(r4) /* do some words */
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stwu r9,4(r6)
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bdnz 72b
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58: srwi. r0,r5,LG_CACHELINE_BYTES /* # complete cachelines */
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clrlwi r5,r5,32-LG_CACHELINE_BYTES
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li r11,4
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mtctr r0
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beq 63f
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53:
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dcbz r11,r6
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COPY_16_BYTES
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#if L1_CACHE_BYTES >= 32
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COPY_16_BYTES
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#if L1_CACHE_BYTES >= 64
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COPY_16_BYTES
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COPY_16_BYTES
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#if L1_CACHE_BYTES >= 128
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COPY_16_BYTES
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COPY_16_BYTES
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COPY_16_BYTES
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COPY_16_BYTES
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#endif
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#endif
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#endif
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bdnz 53b
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63: srwi. r0,r5,2
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mtctr r0
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beq 64f
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30: lwzu r0,4(r4)
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stwu r0,4(r6)
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bdnz 30b
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64: andi. r0,r5,3
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mtctr r0
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beq+ 65f
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addi r4,r4,3
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addi r6,r6,3
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40: lbzu r0,1(r4)
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stbu r0,1(r6)
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bdnz 40b
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65: blr
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generic_memcpy:
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srwi. r7,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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_GLOBAL(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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_GLOBAL(__copy_tofrom_user)
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addi r4,r4,-4
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addi r6,r3,-4
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neg r0,r3
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andi. r0,r0,CACHELINE_MASK /* # bytes to start of cache line */
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beq 58f
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cmplw 0,r5,r0 /* is this more than total to do? */
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blt 63f /* if not much to do */
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andi. r8,r0,3 /* get it word-aligned first */
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mtctr r8
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beq+ 61f
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70: lbz r9,4(r4) /* do some bytes */
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71: stb r9,4(r6)
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addi r4,r4,1
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addi r6,r6,1
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bdnz 70b
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61: subf r5,r0,r5
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srwi. r0,r0,2
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mtctr r0
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beq 58f
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72: lwzu r9,4(r4) /* do some words */
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73: stwu r9,4(r6)
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bdnz 72b
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.section __ex_table,"a"
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.align 2
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.long 70b,100f
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.long 71b,101f
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.long 72b,102f
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.long 73b,103f
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.text
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58: srwi. r0,r5,LG_CACHELINE_BYTES /* # complete cachelines */
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clrlwi r5,r5,32-LG_CACHELINE_BYTES
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li r11,4
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beq 63f
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/* Here we decide how far ahead to prefetch the source */
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li r3,4
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cmpwi r0,1
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li r7,0
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ble 114f
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li r7,1
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#if MAX_COPY_PREFETCH > 1
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/* Heuristically, for large transfers we prefetch
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MAX_COPY_PREFETCH cachelines ahead. For small transfers
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we prefetch 1 cacheline ahead. */
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cmpwi r0,MAX_COPY_PREFETCH
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ble 112f
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li r7,MAX_COPY_PREFETCH
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112: mtctr r7
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111: dcbt r3,r4
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addi r3,r3,CACHELINE_BYTES
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bdnz 111b
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#else
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dcbt r3,r4
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addi r3,r3,CACHELINE_BYTES
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#endif /* MAX_COPY_PREFETCH > 1 */
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114: subf r8,r7,r0
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mr r0,r7
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mtctr r8
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53: dcbt r3,r4
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54: dcbz r11,r6
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.section __ex_table,"a"
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.align 2
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.long 54b,105f
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.text
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/* the main body of the cacheline loop */
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COPY_16_BYTES_WITHEX(0)
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#if L1_CACHE_BYTES >= 32
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COPY_16_BYTES_WITHEX(1)
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#if L1_CACHE_BYTES >= 64
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COPY_16_BYTES_WITHEX(2)
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COPY_16_BYTES_WITHEX(3)
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#if L1_CACHE_BYTES >= 128
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COPY_16_BYTES_WITHEX(4)
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COPY_16_BYTES_WITHEX(5)
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COPY_16_BYTES_WITHEX(6)
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COPY_16_BYTES_WITHEX(7)
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#endif
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#endif
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#endif
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bdnz 53b
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cmpwi r0,0
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li r3,4
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li r7,0
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bne 114b
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63: srwi. r0,r5,2
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mtctr r0
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beq 64f
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30: lwzu r0,4(r4)
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31: stwu r0,4(r6)
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bdnz 30b
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64: andi. r0,r5,3
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mtctr r0
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beq+ 65f
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40: lbz r0,4(r4)
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41: stb r0,4(r6)
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addi r4,r4,1
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addi r6,r6,1
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bdnz 40b
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65: li r3,0
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blr
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/* read fault, initial single-byte copy */
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100: li r9,0
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b 90f
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/* write fault, initial single-byte copy */
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101: li r9,1
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90: subf r5,r8,r5
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li r3,0
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b 99f
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/* read fault, initial word copy */
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102: li r9,0
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b 91f
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/* write fault, initial word copy */
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103: li r9,1
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91: li r3,2
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b 99f
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/*
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* this stuff handles faults in the cacheline loop and branches to either
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* 104f (if in read part) or 105f (if in write part), after updating r5
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*/
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COPY_16_BYTES_EXCODE(0)
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#if L1_CACHE_BYTES >= 32
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COPY_16_BYTES_EXCODE(1)
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#if L1_CACHE_BYTES >= 64
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COPY_16_BYTES_EXCODE(2)
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COPY_16_BYTES_EXCODE(3)
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#if L1_CACHE_BYTES >= 128
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COPY_16_BYTES_EXCODE(4)
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COPY_16_BYTES_EXCODE(5)
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COPY_16_BYTES_EXCODE(6)
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COPY_16_BYTES_EXCODE(7)
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#endif
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#endif
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#endif
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/* read fault in cacheline loop */
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104: li r9,0
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b 92f
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/* fault on dcbz (effectively a write fault) */
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/* or write fault in cacheline loop */
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105: li r9,1
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92: li r3,LG_CACHELINE_BYTES
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mfctr r8
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add r0,r0,r8
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b 106f
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/* read fault in final word loop */
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108: li r9,0
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b 93f
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/* write fault in final word loop */
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109: li r9,1
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93: andi. r5,r5,3
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li r3,2
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b 99f
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/* read fault in final byte loop */
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110: li r9,0
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b 94f
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/* write fault in final byte loop */
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111: li r9,1
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94: li r5,0
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li r3,0
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/*
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* At this stage the number of bytes not copied is
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* r5 + (ctr << r3), and r9 is 0 for read or 1 for write.
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*/
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99: mfctr r0
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106: slw r3,r0,r3
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add. r3,r3,r5
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beq 120f /* shouldn't happen */
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cmpwi 0,r9,0
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bne 120f
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/* for a read fault, first try to continue the copy one byte at a time */
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mtctr r3
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130: lbz r0,4(r4)
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131: stb r0,4(r6)
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addi r4,r4,1
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addi r6,r6,1
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bdnz 130b
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/* then clear out the destination: r3 bytes starting at 4(r6) */
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132: mfctr r3
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srwi. r0,r3,2
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li r9,0
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mtctr r0
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beq 113f
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112: stwu r9,4(r6)
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bdnz 112b
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113: andi. r0,r3,3
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mtctr r0
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beq 120f
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114: stb r9,4(r6)
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addi r6,r6,1
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bdnz 114b
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120: blr
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.section __ex_table,"a"
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.align 2
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.long 30b,108b
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.long 31b,109b
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.long 40b,110b
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.long 41b,111b
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.long 130b,132b
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.long 131b,120b
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.long 112b,120b
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.long 114b,120b
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.text
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