forked from Minki/linux
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>
98 lines
2.1 KiB
ArmAsm
98 lines
2.1 KiB
ArmAsm
/*
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* linux/arch/arm/lib/csumpartialcopyuser.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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* 27/03/03 Ian Molton Clean up CONFIG_CPU
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*
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/errno.h>
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#include <asm/asm-offsets.h>
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.text
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#ifdef CONFIG_CPU_SW_DOMAIN_PAN
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.macro save_regs
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mrc p15, 0, ip, c3, c0, 0
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stmfd sp!, {r1, r2, r4 - r8, ip, lr}
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uaccess_enable ip
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.endm
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.macro load_regs
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ldmfd sp!, {r1, r2, r4 - r8, ip, lr}
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mcr p15, 0, ip, c3, c0, 0
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ret lr
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.endm
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#else
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.macro save_regs
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stmfd sp!, {r1, r2, r4 - r8, lr}
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.endm
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.macro load_regs
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ldmfd sp!, {r1, r2, r4 - r8, pc}
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.endm
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#endif
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.macro load1b, reg1
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ldrusr \reg1, r0, 1
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.endm
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.macro load2b, reg1, reg2
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ldrusr \reg1, r0, 1
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ldrusr \reg2, r0, 1
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.endm
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.macro load1l, reg1
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ldrusr \reg1, r0, 4
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.endm
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.macro load2l, reg1, reg2
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ldrusr \reg1, r0, 4
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ldrusr \reg2, r0, 4
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.endm
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.macro load4l, reg1, reg2, reg3, reg4
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ldrusr \reg1, r0, 4
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ldrusr \reg2, r0, 4
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ldrusr \reg3, r0, 4
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ldrusr \reg4, r0, 4
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.endm
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/*
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* unsigned int
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* csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
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* r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
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* Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
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*/
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#define FN_ENTRY ENTRY(csum_partial_copy_from_user)
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#define FN_EXIT ENDPROC(csum_partial_copy_from_user)
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#include "csumpartialcopygeneric.S"
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/*
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* FIXME: minor buglet here
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* We don't return the checksum for the data present in the buffer. To do
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* so properly, we would have to add in whatever registers were loaded before
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* the fault, which, with the current asm above is not predictable.
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*/
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.pushsection .text.fixup,"ax"
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.align 4
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9001: mov r4, #-EFAULT
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ldr r5, [sp, #8*4] @ *err_ptr
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str r4, [r5]
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ldmia sp, {r1, r2} @ retrieve dst, len
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add r2, r2, r1
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mov r0, #0 @ zero the buffer
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9002: teq r2, r1
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strneb r0, [r1], #1
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bne 9002b
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load_regs
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.popsection
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