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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
138 lines
2.7 KiB
ArmAsm
138 lines
2.7 KiB
ArmAsm
/*
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* linux/arch/arm/lib/memset.S
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*
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* Copyright (C) 1995-2000 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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* ASM optimised string functions
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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/unwind.h>
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.text
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.align 5
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ENTRY(mmioset)
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ENTRY(memset)
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UNWIND( .fnstart )
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ands r3, r0, #3 @ 1 unaligned?
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mov ip, r0 @ preserve r0 as return value
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bne 6f @ 1
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/*
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* we know that the pointer in ip is aligned to a word boundary.
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*/
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1: orr r1, r1, r1, lsl #8
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orr r1, r1, r1, lsl #16
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mov r3, r1
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cmp r2, #16
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blt 4f
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#if ! CALGN(1)+0
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/*
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* We need 2 extra registers for this loop - use r8 and the LR
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*/
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stmfd sp!, {r8, lr}
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UNWIND( .fnend )
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UNWIND( .fnstart )
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UNWIND( .save {r8, lr} )
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mov r8, r1
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mov lr, r1
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2: subs r2, r2, #64
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stmgeia ip!, {r1, r3, r8, lr} @ 64 bytes at a time.
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stmgeia ip!, {r1, r3, r8, lr}
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stmgeia ip!, {r1, r3, r8, lr}
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stmgeia ip!, {r1, r3, r8, lr}
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bgt 2b
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ldmeqfd sp!, {r8, pc} @ Now <64 bytes to go.
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/*
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* No need to correct the count; we're only testing bits from now on
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*/
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tst r2, #32
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stmneia ip!, {r1, r3, r8, lr}
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stmneia ip!, {r1, r3, r8, lr}
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tst r2, #16
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stmneia ip!, {r1, r3, r8, lr}
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ldmfd sp!, {r8, lr}
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UNWIND( .fnend )
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#else
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/*
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* This version aligns the destination pointer in order to write
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* whole cache lines at once.
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*/
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stmfd sp!, {r4-r8, lr}
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UNWIND( .fnend )
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UNWIND( .fnstart )
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UNWIND( .save {r4-r8, lr} )
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mov r4, r1
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mov r5, r1
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mov r6, r1
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mov r7, r1
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mov r8, r1
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mov lr, r1
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cmp r2, #96
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tstgt ip, #31
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ble 3f
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and r8, ip, #31
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rsb r8, r8, #32
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sub r2, r2, r8
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movs r8, r8, lsl #(32 - 4)
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stmcsia ip!, {r4, r5, r6, r7}
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stmmiia ip!, {r4, r5}
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tst r8, #(1 << 30)
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mov r8, r1
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strne r1, [ip], #4
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3: subs r2, r2, #64
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stmgeia ip!, {r1, r3-r8, lr}
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stmgeia ip!, {r1, r3-r8, lr}
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bgt 3b
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ldmeqfd sp!, {r4-r8, pc}
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tst r2, #32
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stmneia ip!, {r1, r3-r8, lr}
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tst r2, #16
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stmneia ip!, {r4-r7}
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ldmfd sp!, {r4-r8, lr}
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UNWIND( .fnend )
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#endif
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UNWIND( .fnstart )
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4: tst r2, #8
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stmneia ip!, {r1, r3}
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tst r2, #4
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strne r1, [ip], #4
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/*
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* When we get here, we've got less than 4 bytes to zero. We
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* may have an unaligned pointer as well.
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*/
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5: tst r2, #2
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strneb r1, [ip], #1
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strneb r1, [ip], #1
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tst r2, #1
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strneb r1, [ip], #1
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ret lr
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6: subs r2, r2, #4 @ 1 do we have enough
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blt 5b @ 1 bytes to align with?
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cmp r3, #2 @ 1
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strltb r1, [ip], #1 @ 1
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strleb r1, [ip], #1 @ 1
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strb r1, [ip], #1 @ 1
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add r2, r2, r3 @ 1 (r2 = r2 - (4 - r3))
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b 1b
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UNWIND( .fnend )
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ENDPROC(memset)
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ENDPROC(mmioset)
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