8adbb3718d
Patch from Nicolas Pitre For assembly labels to actually be local they must start with ".L" and not only "." otherwise they still remain visible in the final link and clutter kallsyms needlessly, and possibly make for unclear symbolic backtrace. This patch simply inserts a"L" where appropriate. The code itself is unchanged. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
142 lines
3.0 KiB
ArmAsm
142 lines
3.0 KiB
ArmAsm
/*
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* linux/arch/arm/lib/csumpartial.S
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*
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* Copyright (C) 1995-1998 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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.text
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/*
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* Function: __u32 csum_partial(const char *src, int len, __u32 sum)
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* Params : r0 = buffer, r1 = len, r2 = checksum
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* Returns : r0 = new checksum
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*/
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buf .req r0
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len .req r1
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sum .req r2
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td0 .req r3
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td1 .req r4 @ save before use
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td2 .req r5 @ save before use
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td3 .req lr
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.Lzero: mov r0, sum
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add sp, sp, #4
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ldr pc, [sp], #4
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/*
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* Handle 0 to 7 bytes, with any alignment of source and
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* destination pointers. Note that when we get here, C = 0
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*/
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.Lless8: teq len, #0 @ check for zero count
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beq .Lzero
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/* we must have at least one byte. */
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tst buf, #1 @ odd address?
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movne sum, sum, ror #8
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ldrneb td0, [buf], #1
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subne len, len, #1
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adcnes sum, sum, td0, put_byte_1
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.Lless4: tst len, #6
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beq .Lless8_byte
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/* we are now half-word aligned */
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.Lless8_wordlp:
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#if __LINUX_ARM_ARCH__ >= 4
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ldrh td0, [buf], #2
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sub len, len, #2
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#else
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ldrb td0, [buf], #1
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ldrb td3, [buf], #1
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sub len, len, #2
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#ifndef __ARMEB__
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orr td0, td0, td3, lsl #8
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#else
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orr td0, td3, td0, lsl #8
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#endif
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#endif
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adcs sum, sum, td0
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tst len, #6
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bne .Lless8_wordlp
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.Lless8_byte: tst len, #1 @ odd number of bytes
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ldrneb td0, [buf], #1 @ include last byte
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adcnes sum, sum, td0, put_byte_0 @ update checksum
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.Ldone: adc r0, sum, #0 @ collect up the last carry
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ldr td0, [sp], #4
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tst td0, #1 @ check buffer alignment
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movne r0, r0, ror #8 @ rotate checksum by 8 bits
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ldr pc, [sp], #4 @ return
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.Lnot_aligned: tst buf, #1 @ odd address
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ldrneb td0, [buf], #1 @ make even
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subne len, len, #1
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adcnes sum, sum, td0, put_byte_1 @ update checksum
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tst buf, #2 @ 32-bit aligned?
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#if __LINUX_ARM_ARCH__ >= 4
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ldrneh td0, [buf], #2 @ make 32-bit aligned
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subne len, len, #2
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#else
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ldrneb td0, [buf], #1
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ldrneb ip, [buf], #1
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subne len, len, #2
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#ifndef __ARMEB__
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orrne td0, td0, ip, lsl #8
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#else
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orrne td0, ip, td0, lsl #8
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#endif
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#endif
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adcnes sum, sum, td0 @ update checksum
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mov pc, lr
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ENTRY(csum_partial)
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stmfd sp!, {buf, lr}
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cmp len, #8 @ Ensure that we have at least
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blo .Lless8 @ 8 bytes to copy.
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tst buf, #1
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movne sum, sum, ror #8
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adds sum, sum, #0 @ C = 0
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tst buf, #3 @ Test destination alignment
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blne .Lnot_aligned @ align destination, return here
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1: bics ip, len, #31
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beq 3f
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stmfd sp!, {r4 - r5}
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2: ldmia buf!, {td0, td1, td2, td3}
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adcs sum, sum, td0
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adcs sum, sum, td1
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adcs sum, sum, td2
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adcs sum, sum, td3
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ldmia buf!, {td0, td1, td2, td3}
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adcs sum, sum, td0
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adcs sum, sum, td1
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adcs sum, sum, td2
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adcs sum, sum, td3
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sub ip, ip, #32
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teq ip, #0
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bne 2b
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ldmfd sp!, {r4 - r5}
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3: tst len, #0x1c @ should not change C
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beq .Lless4
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4: ldr td0, [buf], #4
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sub len, len, #4
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adcs sum, sum, td0
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tst len, #0x1c
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bne 4b
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b .Lless4
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