8478132a87
This reverts commit 4dd1837d75.
Moving the exports for assembly code into the assembly files breaks
KSYM trimming, but also breaks modversions.
While fixing the KSYM trimming is trivial, fixing modversions brings
us to a technically worse position that we had prior to the above
change:
- We end up with the prototype definitions divorsed from everything
else, which means that adding or removing assembly level ksyms
become more fragile:
* if adding a new assembly ksyms export, a missed prototype in
asm-prototypes.h results in a successful build if no module in
the selected configuration makes use of the symbol.
* when removing a ksyms export, asm-prototypes.h will get forgotten,
with armksyms.c, you'll get a build error if you forget to touch
the file.
- We end up with the same amount of include files and prototypes,
they're just in a header file instead of a .c file with their
exports.
As for lines of code, we don't get much of a size reduction:
(original commit)
47 files changed, 131 insertions(+), 208 deletions(-)
(fix for ksyms trimming)
7 files changed, 18 insertions(+), 5 deletions(-)
(two fixes for modversions)
1 file changed, 34 insertions(+)
3 files changed, 7 insertions(+), 2 deletions(-)
which results in a net total of only 25 lines deleted.
As there does not seem to be much benefit from this change of approach,
revert the change.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
143 lines
3 KiB
ArmAsm
143 lines
3 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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ret 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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ENDPROC(csum_partial)
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