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>
197 lines
4.8 KiB
ArmAsm
197 lines
4.8 KiB
ArmAsm
/*
|
|
* linux/arch/arm/lib/findbit.S
|
|
*
|
|
* Copyright (C) 1995-2000 Russell King
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* 16th March 2001 - John Ripley <jripley@sonicblue.com>
|
|
* Fixed so that "size" is an exclusive not an inclusive quantity.
|
|
* All users of these functions expect exclusive sizes, and may
|
|
* also call with zero size.
|
|
* Reworked by rmk.
|
|
*/
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
.text
|
|
|
|
/*
|
|
* Purpose : Find a 'zero' bit
|
|
* Prototype: int find_first_zero_bit(void *addr, unsigned int maxbit);
|
|
*/
|
|
ENTRY(_find_first_zero_bit_le)
|
|
teq r1, #0
|
|
beq 3f
|
|
mov r2, #0
|
|
1:
|
|
ARM( ldrb r3, [r0, r2, lsr #3] )
|
|
THUMB( lsr r3, r2, #3 )
|
|
THUMB( ldrb r3, [r0, r3] )
|
|
eors r3, r3, #0xff @ invert bits
|
|
bne .L_found @ any now set - found zero bit
|
|
add r2, r2, #8 @ next bit pointer
|
|
2: cmp r2, r1 @ any more?
|
|
blo 1b
|
|
3: mov r0, r1 @ no free bits
|
|
ret lr
|
|
ENDPROC(_find_first_zero_bit_le)
|
|
|
|
/*
|
|
* Purpose : Find next 'zero' bit
|
|
* Prototype: int find_next_zero_bit(void *addr, unsigned int maxbit, int offset)
|
|
*/
|
|
ENTRY(_find_next_zero_bit_le)
|
|
teq r1, #0
|
|
beq 3b
|
|
ands ip, r2, #7
|
|
beq 1b @ If new byte, goto old routine
|
|
ARM( ldrb r3, [r0, r2, lsr #3] )
|
|
THUMB( lsr r3, r2, #3 )
|
|
THUMB( ldrb r3, [r0, r3] )
|
|
eor r3, r3, #0xff @ now looking for a 1 bit
|
|
movs r3, r3, lsr ip @ shift off unused bits
|
|
bne .L_found
|
|
orr r2, r2, #7 @ if zero, then no bits here
|
|
add r2, r2, #1 @ align bit pointer
|
|
b 2b @ loop for next bit
|
|
ENDPROC(_find_next_zero_bit_le)
|
|
|
|
/*
|
|
* Purpose : Find a 'one' bit
|
|
* Prototype: int find_first_bit(const unsigned long *addr, unsigned int maxbit);
|
|
*/
|
|
ENTRY(_find_first_bit_le)
|
|
teq r1, #0
|
|
beq 3f
|
|
mov r2, #0
|
|
1:
|
|
ARM( ldrb r3, [r0, r2, lsr #3] )
|
|
THUMB( lsr r3, r2, #3 )
|
|
THUMB( ldrb r3, [r0, r3] )
|
|
movs r3, r3
|
|
bne .L_found @ any now set - found zero bit
|
|
add r2, r2, #8 @ next bit pointer
|
|
2: cmp r2, r1 @ any more?
|
|
blo 1b
|
|
3: mov r0, r1 @ no free bits
|
|
ret lr
|
|
ENDPROC(_find_first_bit_le)
|
|
|
|
/*
|
|
* Purpose : Find next 'one' bit
|
|
* Prototype: int find_next_zero_bit(void *addr, unsigned int maxbit, int offset)
|
|
*/
|
|
ENTRY(_find_next_bit_le)
|
|
teq r1, #0
|
|
beq 3b
|
|
ands ip, r2, #7
|
|
beq 1b @ If new byte, goto old routine
|
|
ARM( ldrb r3, [r0, r2, lsr #3] )
|
|
THUMB( lsr r3, r2, #3 )
|
|
THUMB( ldrb r3, [r0, r3] )
|
|
movs r3, r3, lsr ip @ shift off unused bits
|
|
bne .L_found
|
|
orr r2, r2, #7 @ if zero, then no bits here
|
|
add r2, r2, #1 @ align bit pointer
|
|
b 2b @ loop for next bit
|
|
ENDPROC(_find_next_bit_le)
|
|
|
|
#ifdef __ARMEB__
|
|
|
|
ENTRY(_find_first_zero_bit_be)
|
|
teq r1, #0
|
|
beq 3f
|
|
mov r2, #0
|
|
1: eor r3, r2, #0x18 @ big endian byte ordering
|
|
ARM( ldrb r3, [r0, r3, lsr #3] )
|
|
THUMB( lsr r3, #3 )
|
|
THUMB( ldrb r3, [r0, r3] )
|
|
eors r3, r3, #0xff @ invert bits
|
|
bne .L_found @ any now set - found zero bit
|
|
add r2, r2, #8 @ next bit pointer
|
|
2: cmp r2, r1 @ any more?
|
|
blo 1b
|
|
3: mov r0, r1 @ no free bits
|
|
ret lr
|
|
ENDPROC(_find_first_zero_bit_be)
|
|
|
|
ENTRY(_find_next_zero_bit_be)
|
|
teq r1, #0
|
|
beq 3b
|
|
ands ip, r2, #7
|
|
beq 1b @ If new byte, goto old routine
|
|
eor r3, r2, #0x18 @ big endian byte ordering
|
|
ARM( ldrb r3, [r0, r3, lsr #3] )
|
|
THUMB( lsr r3, #3 )
|
|
THUMB( ldrb r3, [r0, r3] )
|
|
eor r3, r3, #0xff @ now looking for a 1 bit
|
|
movs r3, r3, lsr ip @ shift off unused bits
|
|
bne .L_found
|
|
orr r2, r2, #7 @ if zero, then no bits here
|
|
add r2, r2, #1 @ align bit pointer
|
|
b 2b @ loop for next bit
|
|
ENDPROC(_find_next_zero_bit_be)
|
|
|
|
ENTRY(_find_first_bit_be)
|
|
teq r1, #0
|
|
beq 3f
|
|
mov r2, #0
|
|
1: eor r3, r2, #0x18 @ big endian byte ordering
|
|
ARM( ldrb r3, [r0, r3, lsr #3] )
|
|
THUMB( lsr r3, #3 )
|
|
THUMB( ldrb r3, [r0, r3] )
|
|
movs r3, r3
|
|
bne .L_found @ any now set - found zero bit
|
|
add r2, r2, #8 @ next bit pointer
|
|
2: cmp r2, r1 @ any more?
|
|
blo 1b
|
|
3: mov r0, r1 @ no free bits
|
|
ret lr
|
|
ENDPROC(_find_first_bit_be)
|
|
|
|
ENTRY(_find_next_bit_be)
|
|
teq r1, #0
|
|
beq 3b
|
|
ands ip, r2, #7
|
|
beq 1b @ If new byte, goto old routine
|
|
eor r3, r2, #0x18 @ big endian byte ordering
|
|
ARM( ldrb r3, [r0, r3, lsr #3] )
|
|
THUMB( lsr r3, #3 )
|
|
THUMB( ldrb r3, [r0, r3] )
|
|
movs r3, r3, lsr ip @ shift off unused bits
|
|
bne .L_found
|
|
orr r2, r2, #7 @ if zero, then no bits here
|
|
add r2, r2, #1 @ align bit pointer
|
|
b 2b @ loop for next bit
|
|
ENDPROC(_find_next_bit_be)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* One or more bits in the LSB of r3 are assumed to be set.
|
|
*/
|
|
.L_found:
|
|
#if __LINUX_ARM_ARCH__ >= 5
|
|
rsb r0, r3, #0
|
|
and r3, r3, r0
|
|
clz r3, r3
|
|
rsb r3, r3, #31
|
|
add r0, r2, r3
|
|
#else
|
|
tst r3, #0x0f
|
|
addeq r2, r2, #4
|
|
movne r3, r3, lsl #4
|
|
tst r3, #0x30
|
|
addeq r2, r2, #2
|
|
movne r3, r3, lsl #2
|
|
tst r3, #0x40
|
|
addeq r2, r2, #1
|
|
mov r0, r2
|
|
#endif
|
|
cmp r1, r0 @ Clamp to maxbit
|
|
movlo r0, r1
|
|
ret lr
|
|
|