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|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2004-2005 by Jens Arnold
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#ifdef CPU_ARM
.section .icode,"ax",%progbits
#else
.section .icode,"ax",@progbits
#endif
#if CONFIG_CPU == SH7034
.align 2
.global _memcpy
.global ___memcpy_fwd_entry
.type _memcpy,@function
/* Copies <length> bytes of data in memory from <source> to <dest>
* This version is optimized for speed
*
* arguments:
* r4 - destination address
* r5 - source address
* r6 - length
*
* return value:
* r0 - destination address (like ANSI version)
*
* register usage:
* r0 - data / scratch
* r1 - 2nd data / scratch
* r2 - scratch
* r3 - first long bound / adjusted end address (only if >= 11 bytes)
* r4 - current dest address
* r5 - current source address
* r6 - source end address
* r7 - stored dest start address
*
* The instruction order is devised in a way to utilize the pipelining
* of the SH1 to the max. The routine also tries to utilize fast page mode.
*/
_memcpy:
mov r4,r7 /* store dest for returning */
___memcpy_fwd_entry:
add #-8,r4 /* offset for early increment (max. 2 longs) */
mov #11,r0
cmp/hs r0,r6 /* at least 11 bytes to copy? (ensures 2 aligned longs) */
add r5,r6 /* r6 = source_end */
bf .start_b2 /* no: jump directly to byte loop */
mov #3,r0
neg r5,r3
and r0,r3 /* r3 = (4 - align_offset) % 4 */
tst r3,r3 /* already aligned? */
bt .end_b1 /* yes: skip leading byte loop */
add r5,r3 /* r3 = first source long bound */
/* leading byte loop: copies 0..3 bytes */
.loop_b1:
mov.b @r5+,r0 /* load byte & increment source addr */
add #1,r4 /* increment dest addr */
mov.b r0,@(7,r4) /* store byte */
cmp/hi r5,r3 /* runs r5 up to first long bound */
bt .loop_b1
/* now r5 is always at a long boundary */
/* -> memory reading is done in longs for all dest alignments */
/* selector for main copy loop */
.end_b1:
mov #3,r1
and r4,r1 /* r1 = dest alignment offset */
mova .jmptab,r0
mov.b @(r0,r1),r1 /* select appropriate main loop */
add r0,r1
mov r6,r3 /* move end address to r3 */
jmp @r1 /* and jump to it */
add #-7,r3 /* adjust end addr for main loops doing 2 longs/pass */
/** main loops, copying 2 longs per pass to profit from fast page mode **/
/* long aligned destination (fastest) */
.align 2
.loop_do0:
mov.l @r5+,r1 /* load first long & increment source addr */
add #16,r4 /* increment dest addr & account for decrementing stores */
mov.l @r5+,r0 /* load second long & increment source addr */
cmp/hi r5,r3 /* runs r5 up to last or second last long bound */
mov.l r0,@-r4 /* store second long */
mov.l r1,@-r4 /* store first long; NOT ALIGNED - no speed loss here! */
bt .loop_do0
add #4,r3 /* readjust end address */
cmp/hi r5,r3 /* one long left? */
bf .start_b2 /* no, jump to trailing byte loop */
mov.l @r5+,r0 /* load last long & increment source addr */
add #4,r4 /* increment dest addr */
bra .start_b2 /* jump to trailing byte loop */
mov.l r0,@(4,r4) /* store last long */
/* word aligned destination (long + 2) */
.align 2
.loop_do2:
mov.l @r5+,r1 /* load first long & increment source addr */
add #16,r4 /* increment dest addr */
mov.l @r5+,r0 /* load second long & increment source addr */
cmp/hi r5,r3 /* runs r5 up to last or second last long bound */
mov.w r0,@-r4 /* store low word of second long */
xtrct r1,r0 /* extract low word of first long & high word of second long */
mov.l r0,@-r4 /* and store as long */
swap.w r1,r0 /* get high word of first long */
mov.w r0,@-r4 /* and store it */
bt .loop_do2
add #4,r3 /* readjust end address */
cmp/hi r5,r3 /* one long left? */
bf .start_b2 /* no, jump to trailing byte loop */
mov.l @r5+,r0 /* load last long & increment source addr */
add #4,r4 /* increment dest addr */
mov.w r0,@(6,r4) /* store low word */
shlr16 r0 /* get high word */
bra .start_b2 /* jump to trailing byte loop */
mov.w r0,@(4,r4) /* and store it */
/* jumptable for loop selector */
.align 2
.jmptab:
.byte .loop_do0 - .jmptab /* placed in the middle because the SH1 */
.byte .loop_do1 - .jmptab /* loads bytes sign-extended. Otherwise */
.byte .loop_do2 - .jmptab /* the last loop would be out of reach */
.byte .loop_do3 - .jmptab /* of the offset range. */
/* byte aligned destination (long + 1) */
.align 2
.loop_do1:
mov.l @r5+,r1 /* load first long & increment source addr */
add #16,r4 /* increment dest addr */
mov.l @r5+,r0 /* load second long & increment source addr */
cmp/hi r5,r3 /* runs r5 up to last or second last long bound */
mov.b r0,@-r4 /* store low byte of second long */
shlr8 r0 /* get upper 3 bytes */
mov r1,r2 /* copy first long */
shll16 r2 /* move low byte of first long all the way up, .. */
shll8 r2
or r2,r0 /* ..combine with the 3 bytes of second long.. */
mov.l r0,@-r4 /* ..and store as long */
shlr8 r1 /* get middle 2 bytes */
mov.w r1,@-r4 /* store as word */
shlr16 r1 /* get upper byte */
mov.b r1,@-r4 /* and store */
bt .loop_do1
add #4,r3 /* readjust end address */
.last_do13:
cmp/hi r5,r3 /* one long left? */
bf .start_b2 /* no, jump to trailing byte loop */
mov.l @r5+,r0 /* load last long & increment source addr */
add #12,r4 /* increment dest addr */
mov.b r0,@-r4 /* store low byte */
shlr8 r0 /* get middle 2 bytes */
mov.w r0,@-r4 /* store as word */
shlr16 r0 /* get upper byte */
mov.b r0,@-r4 /* and store */
bra .start_b2 /* jump to trailing byte loop */
add #-4,r4 /* readjust destination */
/* byte aligned destination (long + 3) */
.align 2
.loop_do3:
mov.l @r5+,r1 /* load first long & increment source addr */
add #16,r4 /* increment dest addr */
mov.l @r5+,r0 /* load second long & increment source addr */
mov r1,r2 /* copy first long */
mov.b r0,@-r4 /* store low byte of second long */
shlr8 r0 /* get middle 2 bytes */
mov.w r0,@-r4 /* store as word */
shlr16 r0 /* get upper byte */
shll8 r2 /* move lower 3 bytes of first long one up.. */
or r2,r0 /* ..combine with the 1 byte of second long.. */
mov.l r0,@-r4 /* ..and store as long */
shlr16 r1 /* get upper byte of first long.. */
shlr8 r1
cmp/hi r5,r3 /* runs r5 up to last or second last long bound */
mov.b r1,@-r4 /* ..and store */
bt .loop_do3
bra .last_do13 /* handle last longword: reuse routine for (long + 1) */
add #4,r3 /* readjust end address */
/* trailing byte loop: copies 0..3 bytes (or all for < 11 in total) */
.align 2
.loop_b2:
mov.b @r5+,r0 /* load byte & increment source addr */
add #1,r4 /* increment dest addr */
mov.b r0,@(7,r4) /* store byte */
.start_b2:
cmp/hi r5,r6 /* runs r5 up to end address */
bt .loop_b2
rts
mov r7,r0 /* return dest start address */
.end:
.size _memcpy,.end-_memcpy
#elif defined(CPU_COLDFIRE)
#define FULLSPEED /* use burst writing for word aligned destinations */
.align 2
.global memcpy
.global __memcpy_fwd_entry
.type memcpy,@function
/* Copies <length> bytes of data in memory from <source> to <dest>
* This version is optimized for speed
*
* arguments:
* (4,%sp) - destination address
* (8,%sp) - source address
* (12,%sp) - length
*
* return value:
* %d0 - destination address (like ANSI version)
*
* register usage:
* %a0 - current source address
* %a1 - current dest address
* %a2 - source end address (in line-copy loops)
* %d0 - data / scratch
* %d1 - source end address (byte and longword copy) / data / scratch
* %d2 - data / scratch
* %d3..%d7 - data
*
* For maximum speed this routine reads and writes whole lines using burst
* move (movem.l) where possible. For byte aligned destinations (long+1 and
* long+3) it writes longwords only. Same goes for word aligned destinations
* if FULLSPEED is undefined.
*/
memcpy:
move.l (4,%sp),%a1 /* Destination */
move.l (8,%sp),%a0 /* Source */
move.l (12,%sp),%d1 /* Length */
__memcpy_fwd_entry:
add.l %a0,%d1 /* %d1 = source end */
move.l %a0,%d0
addq.l #7,%d0
and.l #0xFFFFFFFC,%d0 /* %d0 = first source long bound + 4 */
cmp.l %d0,%d1 /* at least one aligned longword to copy? */
blo.w .bytes2_start /* no, jump directly to trailing byte loop */
subq.l #4,%d0 /* %d0 = first source long bound */
cmp.l %a0,%d0 /* any bytes to copy? */
jls .bytes1_end /* no: skip byte loop */
/* leading byte loop: copies 0..3 bytes */
.bytes1_loop:
move.b (%a0)+,(%a1)+ /* copy byte */
cmp.l %a0,%d0 /* runs %a0 up to first long bound */
jhi .bytes1_loop
.bytes1_end:
moveq.l #31,%d0
add.l %a0,%d0
and.l #0xFFFFFFF0,%d0 /* %d0 = first source line bound + 16 */
cmp.l %d0,%d1 /* at least one aligned line to copy? */
blo.w .long_start /* no: jump to longword copy loop */
lea.l (-28,%sp),%sp /* free up some registers */
movem.l %d2-%d7/%a2,(%sp)
moveq.l #16,%d2
sub.l %d2,%d0 /* %d0 = first source line bound */
move.l %d1,%a2 /* %a2 = end address */
lea.l (-15,%a2),%a2 /* adjust end address for loops doing 16 bytes/ pass */
move.l %a1,%d1
moveq.l #3,%d2 /* mask */
and.l %d2,%d1
jmp.l (2,%pc,%d1.l*4) /* switch (dest_addr & 3) */
bra.w .lines_do0_start
bra.w .lines_do1_start
bra.w .lines_do2_start
/* bra.w .lines_do3_start implicit */
/* byte aligned destination (long + 3): use line burst reads in main loop */
.lines_do3_start:
moveq.l #24,%d1 /* shift count for shifting by 3 bytes */
cmp.l %a0,%d0 /* any leading longwords? */
jhi .lines_do3_head_start /* yes: leading longword copy */
movem.l (%a0),%d4-%d7 /* load first line */
lea.l (16,%a0),%a0
move.l %d4,%d2
lsr.l %d1,%d2 /* get high byte of first longword */
move.b %d2,(%a1)+ /* store byte */
jra .lines_do3_entry /* jump into main loop */
.lines_do3_head_start:
move.l (%a0)+,%d7 /* load first longword */
move.l %d7,%d2
lsr.l %d1,%d2 /* get high byte */
move.b %d2,(%a1)+ /* store byte */
jra .lines_do3_head_entry /* jump into leading longword loop */
.lines_do3_head_loop:
move.l %d7,%d6 /* move old longword away */
move.l (%a0)+,%d7 /* load new longword */
move.l %d7,%d2
lsr.l %d1,%d2 /* get high byte */
or.l %d2,%d6 /* combine with old lower 3 bytes */
move.l %d6,(%a1)+ /* store longword */
.lines_do3_head_entry:
lsl.l #8,%d7 /* shift up lower 3 bytes */
cmp.l %a0,%d0 /* runs %a0 up to first line bound */
jhi .lines_do3_head_loop
.lines_do3_loop:
move.l %d7,%d3 /* move last longword of old line away */
movem.l (%a0),%d4-%d7 /* load new line */
lea.l (16,%a0),%a0
move.l %d4,%d2
lsr.l %d1,%d2 /* get high byte of 1st longword */
or.l %d2,%d3 /* combine with old lower 3 bytes */
move.l %d3,(%a1)+ /* store longword */
.lines_do3_entry:
lsl.l #8,%d4 /* shift up lower 3 bytes */
move.l %d5,%d2
lsr.l %d1,%d2 /* get high byte of 2nd longword */
or.l %d2,%d4 /* combine with 1st lower 3 bytes */
move.l %d4,(%a1)+ /* store longword */
lsl.l #8,%d5 /* shift up lower 3 bytes */
move.l %d6,%d2
lsr.l %d1,%d2 /* get high byte of 3rd longword */
or.l %d2,%d5 /* combine with 2nd lower 3 bytes */
move.l %d5,(%a1)+ /* store longword */
lsl.l #8,%d6 /* shift up lower 3 bytes */
move.l %d7,%d2
lsr.l %d1,%d2 /* get high byte of 4th longword */
or.l %d2,%d6 /* combine with 3rd lower 3 bytes */
move.l %d6,(%a1)+ /* store longword */
lsl.l #8,%d7 /* shift up lower 3 bytes */
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_do3_loop
lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
cmp.l %a0,%a2 /* any trailing longwords? */
jls .lines_do3_tail_end /* no: just store last lower 3 bytes */
.lines_do3_tail_loop:
move.l %d7,%d6 /* move old longword away */
move.l (%a0)+,%d7 /* load new longword */
move.l %d7,%d2
lsr.l %d1,%d2 /* get high byte */
or.l %d2,%d6 /* combine with old lower 3 bytes */
move.l %d6,(%a1)+ /* store longword */
lsl.l #8,%d7 /* shift up lower 3 bytes */
cmp.l %a0,%a2 /* runs %a0 up to last long bound */
jhi .lines_do3_tail_loop
.lines_do3_tail_end:
swap %d7 /* get high word */
move.w %d7,(%a1)+ /* store word */
lsr.l %d1,%d7 /* get moved-up low byte */
move.b %d7,(%a1)+ /* store byte */
jra .lines_end
/* byte aligned destination (long + 1): use line burst reads in main loop */
.lines_do1_start:
moveq.l #24,%d1 /* shift count for shifting by 3 bytes */
cmp.l %a0,%d0 /* any leading longwords? */
jhi .lines_do1_head_start /* yes: leading longword copy */
movem.l (%a0),%d4-%d7 /* load first line */
lea.l (16,%a0),%a0
move.l %d4,%d2 /* first longword, bytes 3210 */
lsr.l #8,%d2 /* first longword, bytes .321 */
swap %d2 /* first longword, bytes 21.3 */
move.b %d2,(%a1)+ /* store byte */
swap %d2 /* first longword, bytes .321 */
move.w %d2,(%a1)+ /* store word */
jra .lines_do1_entry
.lines_do1_head_start:
move.l (%a0)+,%d7 /* load first longword */
move.l %d7,%d2 /* first longword, bytes 3210 */
lsr.l #8,%d2 /* first longword, bytes .321 */
swap %d2 /* first longword, bytes 21.3 */
move.b %d2,(%a1)+ /* store byte */
swap %d2 /* first longword, bytes .321 */
move.w %d2,(%a1)+ /* store word */
jra .lines_do1_head_entry
.lines_do1_head_loop:
move.l %d7,%d6 /* move old longword away */
move.l (%a0)+,%d7 /* load new longword */
move.l %d7,%d2
lsr.l #8,%d2 /* get upper 3 bytes */
or.l %d2,%d6 /* combine with old low byte */
move.l %d6,(%a1)+ /* store longword */
.lines_do1_head_entry:
lsl.l %d1,%d7 /* shift up low byte */
cmp.l %a0,%d0 /* runs %a0 up to first line bound */
jhi .lines_do1_head_loop
.lines_do1_loop:
move.l %d7,%d3 /* move last longword of old line away */
movem.l (%a0),%d4-%d7 /* load new line */
lea.l (16,%a0),%a0
move.l %d4,%d2
lsr.l #8,%d2 /* get upper 3 bytes of 1st longword */
or.l %d2,%d3 /* combine with low byte of old longword */
move.l %d3,(%a1)+ /* store longword */
.lines_do1_entry:
lsl.l %d1,%d4 /* shift up low byte */
move.l %d5,%d2
lsr.l #8,%d2 /* get upper 3 bytes of 2nd longword */
or.l %d2,%d4 /* combine with low byte of 1st longword */
move.l %d4,(%a1)+ /* store longword */
lsl.l %d1,%d5 /* shift up low byte */
move.l %d6,%d2
lsr.l #8,%d2 /* get upper 3 bytes of 3rd longword */
or.l %d2,%d5 /* combine with low byte of 2nd longword */
move.l %d5,(%a1)+ /* store longword */
lsl.l %d1,%d6 /* shift up low byte */
move.l %d7,%d2
lsr.l #8,%d2 /* get upper 3 bytes of 4th longword */
or.l %d2,%d6 /* combine with low byte of 4th longword */
move.l %d6,(%a1)+ /* store longword */
lsl.l %d1,%d7 /* shift up low byte */
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_do1_loop
lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
cmp.l %a0,%a2 /* any trailing longwords? */
jls .lines_do1_tail_end /* no: just store last low byte */
.lines_do1_tail_loop:
move.l %d7,%d6 /* move old longword away */
move.l (%a0)+,%d7 /* load new longword */
move.l %d7,%d2
lsr.l #8,%d2 /* get upper 3 bytes */
or.l %d2,%d6 /* combine with old low byte */
move.l %d6,(%a1)+ /* store longword */
lsl.l %d1,%d7 /* shift up low byte */
cmp.l %a0,%a2 /* runs %a0 up to last long bound */
jhi .lines_do1_tail_loop
.lines_do1_tail_end:
lsr.l %d1,%d7 /* get shifted-up low byte */
move.b %d7,(%a1)+ /* store byte */
jra .lines_end
/* long aligned destination (line + 0/4/8/12): head */
.lines_do0_head_loop:
move.l (%a0)+,(%a1)+ /* copy longword */
.lines_do0_start:
cmp.l %a0,%d0 /* runs %a0 up to first line bound */
jhi .lines_do0_head_loop
.lines_do0_head_end:
move.l %a1,%d1
lsr.l #2,%d1
moveq.l #3,%d0 /* mask */
and.l %d0,%d1
moveq.l #16,%d0 /* address increment for one main loop pass */
jmp.l (2,%pc,%d1.l*2) /* switch ((dest_addr >> 2) & 3) */
bra.b .lines_lo0_start
bra.b .lines_lo4_start
bra.b .lines_lo8_start
/* bra.b .lines_lo12_start implicit */
/* long aligned destination (line + 12): use line bursts in the loop */
.lines_lo12_start:
movem.l (%a0),%d4-%d7 /* load first line */
add.l %d0,%a0
move.l %d4,(%a1)+ /* store 1st longword */
cmp.l %a0,%a2 /* any full lines? */
jls .lines_lo12_end /* no: skip main loop */
.lines_lo12_loop:
move.l %d5,%d1 /* move last 3 longwords of old line away */
move.l %d6,%d2
move.l %d7,%d3
movem.l (%a0),%d4-%d7 /* load new line */
add.l %d0,%a0
movem.l %d1-%d4,(%a1) /* store line (3 old + 1 new longwords) */
add.l %d0,%a1
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_lo12_loop
/* long aligned destination (line + 0/4/8/12): tail */
.lines_lo12_end:
move.l %d5,(%a1)+ /* store 3rd last longword */
.lines_lo8_end:
move.l %d6,(%a1)+ /* store 2nd last longword */
.lines_lo4_end:
move.l %d7,(%a1)+ /* store last longword */
.lines_lo0_end:
lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
cmp.l %a0,%a2 /* any trailing longwords? */
jls .lines_end /* no: get outta here */
.lines_do0_tail_loop:
move.l (%a0)+,(%a1)+ /* copy longword */
cmp.l %a0,%a2 /* runs %a0 up to last long bound */
jhi .lines_do0_tail_loop
jra .lines_end
/* line aligned destination: use line bursts in the loop */
.lines_lo0_start:
.lines_lo0_loop:
movem.l (%a0),%d4-%d7 /* load line */
add.l %d0,%a0
movem.l %d4-%d7,(%a1) /* store line */
add.l %d0,%a1
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_lo0_loop
jra .lines_lo0_end /* handle trailing longwords */
/* long aligned destination (line + 4): use line bursts in the loop */
.lines_lo4_start:
movem.l (%a0),%d4-%d7 /* load first line */
add.l %d0,%a0
move.l %d4,(%a1)+ /* store 1st longword */
move.l %d5,(%a1)+ /* store 2nd longword */
move.l %d6,(%a1)+ /* store 3rd longword */
cmp.l %a0,%a2 /* any full lines? */
jls .lines_lo4_end /* no: skip main loop */
.lines_lo4_loop:
move.l %d7,%d3 /* move last longword of old line away */
movem.l (%a0),%d4-%d7 /* load new line */
add.l %d0,%a0
movem.l %d3-%d6,(%a1) /* store line (1 old + 3 new longwords) */
add.l %d0,%a1
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_lo4_loop
jra .lines_lo4_end /* handle trailing longwords */
/* long aligned destination (line + 8): use line bursts in the loop */
.lines_lo8_start:
movem.l (%a0),%d4-%d7 /* load first line */
add.l %d0,%a0
move.l %d4,(%a1)+ /* store 1st longword */
move.l %d5,(%a1)+ /* store 2nd longword */
cmp.l %a0,%a2
jls .lines_lo8_end
.lines_lo8_loop:
move.l %d6,%d2 /* move last 2 longwords of old line away */
move.l %d7,%d3
movem.l (%a0),%d4-%d7 /* load new line */
add.l %d0,%a0
movem.l %d2-%d5,(%a1) /* store line (2 old + 2 new longwords) */
add.l %d0,%a1
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_lo8_loop
jra .lines_lo8_end /* handle trailing longwords */
#ifdef FULLSPEED
/* word aligned destination (line + 2/6/10/14): head */
.lines_do2_start:
cmp.l %a0,%d0 /* any leading longwords? */
jls .lines_do2_selector /* no: jump to mainloop selector */
move.l (%a0)+,%d7 /* load first longword */
swap %d7 /* swap words */
move.w %d7,(%a1)+ /* store high word */
cmp.l %a0,%d0 /* any more longword? */
jls .lines_do2_head_end /* no: skip head loop */
.lines_do2_head_loop:
move.l %d7,%d6 /* move old longword away */
move.l (%a0)+,%d7 /* load new longword */
swap %d7 /* swap words */
move.w %d7,%d6 /* combine high word with old low word */
move.l %d6,(%a1)+ /* store longword */
cmp.l %a0,%d0 /* runs %a0 up to first line bound */
jhi .lines_do2_head_loop
.lines_do2_head_end:
swap %d7 /* undo swap */
move.w %d7,(%a1)+ /* store word */
.lines_do2_selector:
move.l %a1,%d1
lsr.l #2,%d1
moveq.l #3,%d0 /* mask */
and.l %d0,%d1
moveq.l #16,%d0 /* address increment for one main loop pass */
jmp.l (2,%pc,%d1.l*4) /* switch ((dest_addr >> 2) & 3) */
bra.w .lines_lo2_start
bra.w .lines_lo6_start
bra.w .lines_lo10_start
/* bra.w .lines_lo14_start implicit */
/* word aligned destination (line + 14): use line bursts in the loop */
.lines_lo14_start:
movem.l (%a0),%d4-%d7 /* load first line */
add.l %d0,%a0
swap %d4 /* swap words of 1st long */
move.w %d4,(%a1)+ /* store word */
jra .lines_lo14_entry /* jump into main loop */
.lines_lo14_loop:
move.l %d4,%d0 /* move old line away */
move.l %d5,%d1
move.l %d6,%d2
move.l %d7,%d3
movem.l (%a0),%d4-%d7 /* load new line */
lea.l (16,%a0),%a0
swap %d4 /* swap words of 1st long */
move.w %d4,%d3 /* combine 1st high word with old low word */
movem.l %d0-%d3,(%a1) /* store line */
lea.l (16,%a1),%a1
.lines_lo14_entry:
swap %d5 /* swap words of 2nd long */
move.w %d5,%d4 /* combine 2nd high word with 1st low word */
swap %d6 /* swap words of 3rd long */
move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
swap %d7 /* swap words of 4th long */
move.w %d7,%d6 /* combine 4th high word with 3rd low word */
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_lo14_loop
/* word aligned destination (line + 2/6/10/14): tail */
.lines_lo14_end:
move.l %d4,(%a1)+ /* store third last longword */
.lines_lo10_end:
move.l %d5,(%a1)+ /* store second last longword */
.lines_lo6_end:
move.l %d6,(%a1)+ /* store last longword */
.lines_lo2_end:
lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
cmp.l %a0,%a2 /* any trailing longwords? */
jls .lines_do2_tail_end /* no: skip tail loop */
.lines_do2_tail_loop:
move.l %d7,%d6 /* move old longword away */
move.l (%a0)+,%d7 /* load new longword */
swap %d7 /* swap words */
move.w %d7,%d6 /* combine high word with old low word */
move.l %d6,(%a1)+ /* store longword */
cmp.l %a0,%a2 /* runs %a0 up to last long bound */
jhi .lines_do2_tail_loop
.lines_do2_tail_end:
swap %d7 /* undo swap */
move.w %d7,(%a1)+ /* store last word */
jra .lines_end
/* word aligned destination (line + 2): use line bursts in the loop */
.lines_lo2_start:
movem.l (%a0),%d4-%d7 /* load first line */
add.l %d0,%a0
swap %d4 /* swap words of 1st long */
move.w %d4,(%a1)+ /* store high word */
swap %d5 /* swap words of 2nd long */
move.w %d5,%d4 /* combine 2nd high word with 1st low word */
swap %d6 /* swap words of 3rd long */
move.w %d6,%d5 /* combine 3nd high word with 2nd low word */
swap %d7 /* swap words of 4th long */
move.w %d7,%d6 /* combine 4th high word with 3rd low word */
move.l %d4,(%a1)+ /* store 1st longword */
move.l %d5,(%a1)+ /* store 2nd longword */
move.l %d6,(%a1)+ /* store 3rd longword */
cmp.l %a0,%a2 /* any full lines? */
jls .lines_lo2_end /* no: skip main loop */
.lines_lo2_loop:
move.l %d7,%d3 /* move last longword of old line away */
movem.l (%a0),%d4-%d7 /* load line */
add.l %d0,%a0
swap %d4 /* swap words of 1st long */
move.w %d4,%d3 /* combine 1st high word with old low word */
swap %d5 /* swap words of 2nd long */
move.w %d5,%d4 /* combine 2nd high word with 1st low word */
swap %d6 /* swap words of 3rd long */
move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
swap %d7 /* swap words of 4th long */
move.w %d7,%d6 /* combine 4th high word with 3rd low word */
movem.l %d3-%d6,(%a1) /* store line */
add.l %d0,%a1
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_lo2_loop
jra .lines_lo2_end /* handle trailing longwords */
/* word aligned destination (line + 6): use line bursts in the loop */
.lines_lo6_start:
movem.l (%a0),%d4-%d7 /* load first line */
add.l %d0,%a0
swap %d4 /* swap words of 1st long */
move.w %d4,(%a1)+ /* store high word */
swap %d5 /* swap words of 2nd long */
move.w %d5,%d4 /* combine 2nd high word with 1st low word */
swap %d6 /* swap words of 3rd long */
move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
move.l %d4,(%a1)+ /* store 1st longword */
move.l %d5,(%a1)+ /* store 2nd longword */
jra .lines_lo6_entry /* jump into main loop */
.lines_lo6_loop:
move.l %d6,%d2 /* move last 2 longwords of old line away */
move.l %d7,%d3
movem.l (%a0),%d4-%d7 /* load line */
add.l %d0,%a0
swap %d4 /* swap words of 1st long */
move.w %d4,%d3 /* combine 1st high word with old low word */
swap %d5 /* swap words of 2nd long */
move.w %d5,%d4 /* combine 2nd high word with 1st low word */
swap %d6 /* swap words of 3rd long */
move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
movem.l %d2-%d5,(%a1) /* store line */
add.l %d0,%a1
.lines_lo6_entry:
swap %d7 /* swap words of 4th long */
move.w %d7,%d6 /* combine 4th high word with 3rd low word */
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_lo6_loop
jra .lines_lo6_end /* handle trailing longwords */
/* word aligned destination (line + 10): use line bursts in the loop */
.lines_lo10_start:
movem.l (%a0),%d4-%d7 /* load first line */
add.l %d0,%a0
swap %d4 /* swap words of 1st long */
move.w %d4,(%a1)+ /* store high word */
swap %d5 /* swap words of 2nd long */
move.w %d5,%d4 /* combine 2nd high word with 1st low word */
move.l %d4,(%a1)+ /* store 1st longword */
jra .lines_lo10_entry /* jump into main loop */
.lines_lo10_loop:
move.l %d5,%d1 /* move last 3 longwords of old line away */
move.l %d6,%d2
move.l %d7,%d3
movem.l (%a0),%d4-%d7 /* load line */
add.l %d0,%a0
swap %d4 /* swap words of 1st long */
move.w %d4,%d3 /* combine 1st high word with old low word */
swap %d5 /* swap words of 2nd long */
move.w %d5,%d4 /* combine 2nd high word with 1st low word */
movem.l %d1-%d4,(%a1) /* store line */
add.l %d0,%a1
.lines_lo10_entry:
swap %d6 /* swap words of 3rd long */
move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
swap %d7 /* swap words of 4th long */
move.w %d7,%d6 /* combine 4th high word with 3rd low word */
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_lo10_loop
jra .lines_lo10_end /* handle trailing longwords */
#else /* !FULLSPEED */
/* word aligned destination (long + 2): use line burst reads in the loop */
.lines_do2_start:
cmp.l %a0,%d0 /* any leading longwords? */
jhi .lines_do2_head_start /* yes: leading longword copy */
movem.l (%a0),%d4-%d7 /* load first line */
lea.l (16,%a0),%a0
swap %d4 /* swap words of 1st long */
move.w %d4,(%a1)+ /* store high word */
jra .lines_do2_entry /* jump into main loop */
.lines_do2_head_start:
move.l (%a0)+,%d7 /* load first longword */
swap %d7 /* swap words */
move.w %d7,(%a1)+ /* store high word */
cmp.l %a0,%d0 /* any full longword? */
jls .lines_do2_loop /* no: skip head loop */
.lines_do2_head_loop:
move.l %d7,%d6 /* move old longword away */
move.l (%a0)+,%d7 /* load new longword */
swap %d7 /* swap words */
move.w %d7,%d6 /* combine high word with old low word */
move.l %d6,(%a1)+ /* store longword */
cmp.l %a0,%d0 /* runs %a0 up to first line bound */
jhi .lines_do2_head_loop
.lines_do2_loop:
move.l %d7,%d3 /* move last longword of old line away */
movem.l (%a0),%d4-%d7 /* load line */
lea.l (16,%a0),%a0
swap %d4 /* swap words of 1st long */
move.w %d4,%d3 /* combine 1st high word with old low word */
move.l %d3,(%a1)+ /* store 1st longword */
.lines_do2_entry:
swap %d5 /* swap words of 2nd long */
move.w %d5,%d4 /* combine 2nd high word with 1st low word */
move.l %d4,(%a1)+ /* store 2nd longword */
swap %d6 /* swap words of 3rd long */
move.w %d6,%d5 /* combine 3rd high word with 2nd low word */
move.l %d5,(%a1)+ /* store 3rd longword */
swap %d7 /* swap words of 4th long */
move.w %d7,%d6 /* combine 4th high word with 3rd low word */
move.l %d6,(%a1)+ /* store 4th longword */
cmp.l %a0,%a2 /* runs %a0 up to last line bound */
jhi .lines_do2_loop
.lines_do2_end:
lea.l (12,%a2),%a2 /* readjust end address for doing longwords */
cmp.l %a0,%a2 /* any trailing longwords? */
jls .lines_do2_tail_end /* no: skip tail loop */
.lines_do2_tail_loop:
move.l %d7,%d6 /* move old longword away */
move.l (%a0)+,%d7 /* load new longword */
swap %d7 /* swap words */
move.w %d7,%d6 /* combine high word with old low word */
move.l %d6,(%a1)+ /* store longword */
cmp.l %a0,%a2 /* runs %a0 up to last long bound */
jhi .lines_do2_tail_loop
.lines_do2_tail_end:
swap %d7 /* undo swap */
move.w %d7,(%a1)+ /* store last word */
/* jra .lines_end implicit */
#endif /* !FULLSPEED */
.lines_end:
addq.l #3,%a2 /* readjust end address */
move.l %a2,%d1 /* end address in %d1 again */
movem.l (%sp),%d2-%d7/%a2 /* restore registers */
lea.l (28,%sp),%sp
jra .bytes2_start /* jump to trailing byte loop */
.long_start:
subq.l #3,%d1 /* adjust end address for doing 4 bytes/ pass */
/* longword copy loop - no lines */
.long_loop:
move.l (%a0)+,(%a1)+ /* copy longword (write can be unaligned) */
cmp.l %a0,%d1 /* runs %a0 up to last long bound */
jhi .long_loop
addq.l #3,%d1 /* readjust end address */
cmp.l %a0,%d1 /* any bytes left? */
jls .bytes2_end /* no: skip trailing byte loop */
/* trailing byte loop */
.bytes2_loop:
move.b (%a0)+,(%a1)+ /* copy byte */
.bytes2_start:
cmp.l %a0,%d1 /* runs %a0 up to end address */
jhi .bytes2_loop
.bytes2_end:
move.l (4,%sp),%d0 /* return destination */
rts
.end:
.size memcpy,.end-memcpy
#elif defined(CPU_ARM)
/*
* linux/arch/arm/lib/memcpy.S and copy_template.S
*
* Author: Nicolas Pitre
* Created: Sep 28, 2005
* Copyright: MontaVista Software, Inc.
*
* 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.
*/
.macro ldr1w ptr reg abort
ldr \reg, [\ptr], #4
.endm
.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
.endm
.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
.endm
.macro ldr1b ptr reg cond=al abort
ldr\cond\()b \reg, [\ptr], #1
.endm
.macro str1w ptr reg abort
str \reg, [\ptr], #4
.endm
.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
.endm
.macro str1b ptr reg cond=al abort
str\cond\()b \reg, [\ptr], #1
.endm
.macro enter reg1 reg2
stmdb sp!, {r0, \reg1, \reg2}
.endm
.macro exit reg1 reg2
ldmfd sp!, {r0, \reg1, \reg2}
.endm
.text
/* Prototype: void *memcpy(void *dest, const void *src, size_t n); */
.global memcpy
.type memcpy,%function
memcpy:
/*
* This can be used to enable code to cacheline align the source pointer.
* Experiments on tested architectures (StrongARM and XScale) didn't show
* this a worthwhile thing to do. That might be different in the future.
*/
//#define CALGN(code...) code
#define CALGN(code...)
#define PLD(code...)
enter r4, lr
subs r2, r2, #4
blt 8f
ands ip, r0, #3
PLD( pld [r1, #0] )
bne 9f
ands ip, r1, #3
bne 10f
1: subs r2, r2, #(28)
stmfd sp!, {r5 - r8}
blt 5f
CALGN( ands ip, r1, #31 )
CALGN( rsb r3, ip, #32 )
CALGN( sbcnes r4, r3, r2 ) @ C is always set here
CALGN( bcs 2f )
CALGN( adr r4, 6f )
CALGN( subs r2, r2, r3 ) @ C gets set
CALGN( add pc, r4, ip )
PLD( pld [r1, #0] )
2: PLD( subs r2, r2, #96 )
PLD( pld [r1, #28] )
PLD( blt 4f )
PLD( pld [r1, #60] )
PLD( pld [r1, #92] )
3: PLD( pld [r1, #124] )
4: ldr8w r1, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
subs r2, r2, #32
str8w r0, r3, r4, r5, r6, r7, r8, ip, lr, abort=20f
bge 3b
PLD( cmn r2, #96 )
PLD( bge 4b )
5: ands ip, r2, #28
rsb ip, ip, #32
addne pc, pc, ip @ C is always clear here
b 7f
6: nop
ldr1w r1, r3, abort=20f
ldr1w r1, r4, abort=20f
ldr1w r1, r5, abort=20f
ldr1w r1, r6, abort=20f
ldr1w r1, r7, abort=20f
ldr1w r1, r8, abort=20f
ldr1w r1, lr, abort=20f
add pc, pc, ip
nop
nop
str1w r0, r3, abort=20f
str1w r0, r4, abort=20f
str1w r0, r5, abort=20f
str1w r0, r6, abort=20f
str1w r0, r7, abort=20f
str1w r0, r8, abort=20f
str1w r0, lr, abort=20f
CALGN( bcs 2b )
7: ldmfd sp!, {r5 - r8}
8: movs r2, r2, lsl #31
ldr1b r1, r3, ne, abort=21f
ldr1b r1, r4, cs, abort=21f
ldr1b r1, ip, cs, abort=21f
str1b r0, r3, ne, abort=21f
str1b r0, r4, cs, abort=21f
str1b r0, ip, cs, abort=21f
exit r4, pc
9: rsb ip, ip, #4
cmp ip, #2
ldr1b r1, r3, gt, abort=21f
ldr1b r1, r4, ge, abort=21f
ldr1b r1, lr, abort=21f
str1b r0, r3, gt, abort=21f
str1b r0, r4, ge, abort=21f
subs r2, r2, ip
str1b r0, lr, abort=21f
blt 8b
ands ip, r1, #3
beq 1b
10: bic r1, r1, #3
cmp ip, #2
ldr1w r1, lr, abort=21f
beq 17f
bgt 18f
.macro forward_copy_shift pull push
subs r2, r2, #28
blt 14f
CALGN( ands ip, r1, #31 )
CALGN( rsb ip, ip, #32 )
CALGN( sbcnes r4, ip, r2 ) @ C is always set here
CALGN( subcc r2, r2, ip )
CALGN( bcc 15f )
11: stmfd sp!, {r5 - r9}
PLD( pld [r1, #0] )
PLD( subs r2, r2, #96 )
PLD( pld [r1, #28] )
PLD( blt 13f )
PLD( pld [r1, #60] )
PLD( pld [r1, #92] )
12: PLD( pld [r1, #124] )
13: ldr4w r1, r4, r5, r6, r7, abort=19f
mov r3, lr, pull #\pull
subs r2, r2, #32
ldr4w r1, r8, r9, ip, lr, abort=19f
orr r3, r3, r4, push #\push
mov r4, r4, pull #\pull
orr r4, r4, r5, push #\push
mov r5, r5, pull #\pull
orr r5, r5, r6, push #\push
mov r6, r6, pull #\pull
orr r6, r6, r7, push #\push
mov r7, r7, pull #\pull
orr r7, r7, r8, push #\push
mov r8, r8, pull #\pull
orr r8, r8, r9, push #\push
mov r9, r9, pull #\pull
orr r9, r9, ip, push #\push
mov ip, ip, pull #\pull
orr ip, ip, lr, push #\push
str8w r0, r3, r4, r5, r6, r7, r8, r9, ip, , abort=19f
bge 12b
PLD( cmn r2, #96 )
PLD( bge 13b )
ldmfd sp!, {r5 - r9}
14: ands ip, r2, #28
beq 16f
15: mov r3, lr, pull #\pull
ldr1w r1, lr, abort=21f
subs ip, ip, #4
orr r3, r3, lr, push #\push
str1w r0, r3, abort=21f
bgt 15b
CALGN( cmp r2, #0 )
CALGN( bge 11b )
16: sub r1, r1, #(\push / 8)
b 8b
.endm
forward_copy_shift pull=8 push=24
17: forward_copy_shift pull=16 push=16
18: forward_copy_shift pull=24 push=8
/*
* Abort preanble and completion macros.
* If a fixup handler is required then those macros must surround it.
* It is assumed that the fixup code will handle the private part of
* the exit macro.
*/
.macro copy_abort_preamble
19: ldmfd sp!, {r5 - r9}
b 21f
20: ldmfd sp!, {r5 - r8}
21:
.endm
.macro copy_abort_end
ldmfd sp!, {r4, pc}
.endm
end:
.size memcpy,.end-memcpy
#endif
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