223 lines
4.4 KiB
ArmAsm
223 lines
4.4 KiB
ArmAsm
/*
|
|
* Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
#ifdef __LITTLE_ENDIAN__
|
|
# define SHIFT_1(RX,RY,IMM) asl RX, RY, IMM ; <<
|
|
# define SHIFT_2(RX,RY,IMM) lsr RX, RY, IMM ; >>
|
|
# define MERGE_1(RX,RY,IMM) asl RX, RY, IMM
|
|
# define MERGE_2(RX,RY,IMM)
|
|
# define EXTRACT_1(RX,RY,IMM) and RX, RY, 0xFFFF
|
|
# define EXTRACT_2(RX,RY,IMM) lsr RX, RY, IMM
|
|
#else
|
|
# define SHIFT_1(RX,RY,IMM) lsr RX, RY, IMM ; >>
|
|
# define SHIFT_2(RX,RY,IMM) asl RX, RY, IMM ; <<
|
|
# define MERGE_1(RX,RY,IMM) asl RX, RY, IMM ; <<
|
|
# define MERGE_2(RX,RY,IMM) asl RX, RY, IMM ; <<
|
|
# define EXTRACT_1(RX,RY,IMM) lsr RX, RY, IMM
|
|
# define EXTRACT_2(RX,RY,IMM) lsr RX, RY, 0x08
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARC_HAS_LL64
|
|
# define LOADX(DST,RX) ldd.ab DST, [RX, 8]
|
|
# define STOREX(SRC,RX) std.ab SRC, [RX, 8]
|
|
# define ZOLSHFT 5
|
|
# define ZOLAND 0x1F
|
|
#else
|
|
# define LOADX(DST,RX) ld.ab DST, [RX, 4]
|
|
# define STOREX(SRC,RX) st.ab SRC, [RX, 4]
|
|
# define ZOLSHFT 4
|
|
# define ZOLAND 0xF
|
|
#endif
|
|
|
|
ENTRY_CFI(memcpy)
|
|
mov.f 0, r2
|
|
;;; if size is zero
|
|
jz.d [blink]
|
|
mov r3, r0 ; don;t clobber ret val
|
|
|
|
;;; if size <= 8
|
|
cmp r2, 8
|
|
bls.d @.Lsmallchunk
|
|
mov.f lp_count, r2
|
|
|
|
and.f r4, r0, 0x03
|
|
rsub lp_count, r4, 4
|
|
lpnz @.Laligndestination
|
|
;; LOOP BEGIN
|
|
ldb.ab r5, [r1,1]
|
|
sub r2, r2, 1
|
|
stb.ab r5, [r3,1]
|
|
.Laligndestination:
|
|
|
|
;;; Check the alignment of the source
|
|
and.f r4, r1, 0x03
|
|
bnz.d @.Lsourceunaligned
|
|
|
|
;;; CASE 0: Both source and destination are 32bit aligned
|
|
;;; Convert len to Dwords, unfold x4
|
|
lsr.f lp_count, r2, ZOLSHFT
|
|
lpnz @.Lcopy32_64bytes
|
|
;; LOOP START
|
|
LOADX (r6, r1)
|
|
LOADX (r8, r1)
|
|
LOADX (r10, r1)
|
|
LOADX (r4, r1)
|
|
STOREX (r6, r3)
|
|
STOREX (r8, r3)
|
|
STOREX (r10, r3)
|
|
STOREX (r4, r3)
|
|
.Lcopy32_64bytes:
|
|
|
|
and.f lp_count, r2, ZOLAND ;Last remaining 31 bytes
|
|
.Lsmallchunk:
|
|
lpnz @.Lcopyremainingbytes
|
|
;; LOOP START
|
|
ldb.ab r5, [r1,1]
|
|
stb.ab r5, [r3,1]
|
|
.Lcopyremainingbytes:
|
|
|
|
j [blink]
|
|
;;; END CASE 0
|
|
|
|
.Lsourceunaligned:
|
|
cmp r4, 2
|
|
beq.d @.LunalignedOffby2
|
|
sub r2, r2, 1
|
|
|
|
bhi.d @.LunalignedOffby3
|
|
ldb.ab r5, [r1, 1]
|
|
|
|
;;; CASE 1: The source is unaligned, off by 1
|
|
;; Hence I need to read 1 byte for a 16bit alignment
|
|
;; and 2bytes to reach 32bit alignment
|
|
ldh.ab r6, [r1, 2]
|
|
sub r2, r2, 2
|
|
;; Convert to words, unfold x2
|
|
lsr.f lp_count, r2, 3
|
|
MERGE_1 (r6, r6, 8)
|
|
MERGE_2 (r5, r5, 24)
|
|
or r5, r5, r6
|
|
|
|
;; Both src and dst are aligned
|
|
lpnz @.Lcopy8bytes_1
|
|
;; LOOP START
|
|
ld.ab r6, [r1, 4]
|
|
ld.ab r8, [r1,4]
|
|
|
|
SHIFT_1 (r7, r6, 24)
|
|
or r7, r7, r5
|
|
SHIFT_2 (r5, r6, 8)
|
|
|
|
SHIFT_1 (r9, r8, 24)
|
|
or r9, r9, r5
|
|
SHIFT_2 (r5, r8, 8)
|
|
|
|
st.ab r7, [r3, 4]
|
|
st.ab r9, [r3, 4]
|
|
.Lcopy8bytes_1:
|
|
|
|
;; Write back the remaining 16bits
|
|
EXTRACT_1 (r6, r5, 16)
|
|
sth.ab r6, [r3, 2]
|
|
;; Write back the remaining 8bits
|
|
EXTRACT_2 (r5, r5, 16)
|
|
stb.ab r5, [r3, 1]
|
|
|
|
and.f lp_count, r2, 0x07 ;Last 8bytes
|
|
lpnz @.Lcopybytewise_1
|
|
;; LOOP START
|
|
ldb.ab r6, [r1,1]
|
|
stb.ab r6, [r3,1]
|
|
.Lcopybytewise_1:
|
|
j [blink]
|
|
|
|
.LunalignedOffby2:
|
|
;;; CASE 2: The source is unaligned, off by 2
|
|
ldh.ab r5, [r1, 2]
|
|
sub r2, r2, 1
|
|
|
|
;; Both src and dst are aligned
|
|
;; Convert to words, unfold x2
|
|
lsr.f lp_count, r2, 3
|
|
#ifdef __BIG_ENDIAN__
|
|
asl.nz r5, r5, 16
|
|
#endif
|
|
lpnz @.Lcopy8bytes_2
|
|
;; LOOP START
|
|
ld.ab r6, [r1, 4]
|
|
ld.ab r8, [r1,4]
|
|
|
|
SHIFT_1 (r7, r6, 16)
|
|
or r7, r7, r5
|
|
SHIFT_2 (r5, r6, 16)
|
|
|
|
SHIFT_1 (r9, r8, 16)
|
|
or r9, r9, r5
|
|
SHIFT_2 (r5, r8, 16)
|
|
|
|
st.ab r7, [r3, 4]
|
|
st.ab r9, [r3, 4]
|
|
.Lcopy8bytes_2:
|
|
|
|
#ifdef __BIG_ENDIAN__
|
|
lsr.nz r5, r5, 16
|
|
#endif
|
|
sth.ab r5, [r3, 2]
|
|
|
|
and.f lp_count, r2, 0x07 ;Last 8bytes
|
|
lpnz @.Lcopybytewise_2
|
|
;; LOOP START
|
|
ldb.ab r6, [r1,1]
|
|
stb.ab r6, [r3,1]
|
|
.Lcopybytewise_2:
|
|
j [blink]
|
|
|
|
.LunalignedOffby3:
|
|
;;; CASE 3: The source is unaligned, off by 3
|
|
;;; Hence, I need to read 1byte for achieve the 32bit alignment
|
|
|
|
;; Both src and dst are aligned
|
|
;; Convert to words, unfold x2
|
|
lsr.f lp_count, r2, 3
|
|
#ifdef __BIG_ENDIAN__
|
|
asl.ne r5, r5, 24
|
|
#endif
|
|
lpnz @.Lcopy8bytes_3
|
|
;; LOOP START
|
|
ld.ab r6, [r1, 4]
|
|
ld.ab r8, [r1,4]
|
|
|
|
SHIFT_1 (r7, r6, 8)
|
|
or r7, r7, r5
|
|
SHIFT_2 (r5, r6, 24)
|
|
|
|
SHIFT_1 (r9, r8, 8)
|
|
or r9, r9, r5
|
|
SHIFT_2 (r5, r8, 24)
|
|
|
|
st.ab r7, [r3, 4]
|
|
st.ab r9, [r3, 4]
|
|
.Lcopy8bytes_3:
|
|
|
|
#ifdef __BIG_ENDIAN__
|
|
lsr.nz r5, r5, 24
|
|
#endif
|
|
stb.ab r5, [r3, 1]
|
|
|
|
and.f lp_count, r2, 0x07 ;Last 8bytes
|
|
lpnz @.Lcopybytewise_3
|
|
;; LOOP START
|
|
ldb.ab r6, [r1,1]
|
|
stb.ab r6, [r3,1]
|
|
.Lcopybytewise_3:
|
|
j [blink]
|
|
|
|
END_CFI(memcpy)
|