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linux-stable/arch/sparc/lib/memcpy.S
David S. Miller a52312b88c sparc32: Correct the return value of memcpy. 
Properly return the original destination buffer pointer.

Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Kjetil Oftedal <oftedal@gmail.com>
2011-10-20 15:17:23 -07:00

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ArmAsm
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/* memcpy.S: Sparc optimized memcpy and memmove code
* Hand optimized from GNU libc's memcpy and memmove
* Copyright (C) 1991,1996 Free Software Foundation
* Copyright (C) 1995 Linus Torvalds (Linus.Torvalds@helsinki.fi)
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*/
#define FUNC(x) \
.globl x; \
.type x,@function; \
.align 4; \
x:
/* Both these macros have to start with exactly the same insn */
#define MOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
ldd [%src + (offset) + 0x00], %t0; \
ldd [%src + (offset) + 0x08], %t2; \
ldd [%src + (offset) + 0x10], %t4; \
ldd [%src + (offset) + 0x18], %t6; \
st %t0, [%dst + (offset) + 0x00]; \
st %t1, [%dst + (offset) + 0x04]; \
st %t2, [%dst + (offset) + 0x08]; \
st %t3, [%dst + (offset) + 0x0c]; \
st %t4, [%dst + (offset) + 0x10]; \
st %t5, [%dst + (offset) + 0x14]; \
st %t6, [%dst + (offset) + 0x18]; \
st %t7, [%dst + (offset) + 0x1c];
#define MOVE_BIGALIGNCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
ldd [%src + (offset) + 0x00], %t0; \
ldd [%src + (offset) + 0x08], %t2; \
ldd [%src + (offset) + 0x10], %t4; \
ldd [%src + (offset) + 0x18], %t6; \
std %t0, [%dst + (offset) + 0x00]; \
std %t2, [%dst + (offset) + 0x08]; \
std %t4, [%dst + (offset) + 0x10]; \
std %t6, [%dst + (offset) + 0x18];
#define MOVE_LASTCHUNK(src, dst, offset, t0, t1, t2, t3) \
ldd [%src - (offset) - 0x10], %t0; \
ldd [%src - (offset) - 0x08], %t2; \
st %t0, [%dst - (offset) - 0x10]; \
st %t1, [%dst - (offset) - 0x0c]; \
st %t2, [%dst - (offset) - 0x08]; \
st %t3, [%dst - (offset) - 0x04];
#define MOVE_LASTALIGNCHUNK(src, dst, offset, t0, t1, t2, t3) \
ldd [%src - (offset) - 0x10], %t0; \
ldd [%src - (offset) - 0x08], %t2; \
std %t0, [%dst - (offset) - 0x10]; \
std %t2, [%dst - (offset) - 0x08];
#define MOVE_SHORTCHUNK(src, dst, offset, t0, t1) \
ldub [%src - (offset) - 0x02], %t0; \
ldub [%src - (offset) - 0x01], %t1; \
stb %t0, [%dst - (offset) - 0x02]; \
stb %t1, [%dst - (offset) - 0x01];
/* Both these macros have to start with exactly the same insn */
#define RMOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
ldd [%src - (offset) - 0x20], %t0; \
ldd [%src - (offset) - 0x18], %t2; \
ldd [%src - (offset) - 0x10], %t4; \
ldd [%src - (offset) - 0x08], %t6; \
st %t0, [%dst - (offset) - 0x20]; \
st %t1, [%dst - (offset) - 0x1c]; \
st %t2, [%dst - (offset) - 0x18]; \
st %t3, [%dst - (offset) - 0x14]; \
st %t4, [%dst - (offset) - 0x10]; \
st %t5, [%dst - (offset) - 0x0c]; \
st %t6, [%dst - (offset) - 0x08]; \
st %t7, [%dst - (offset) - 0x04];
#define RMOVE_BIGALIGNCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
ldd [%src - (offset) - 0x20], %t0; \
ldd [%src - (offset) - 0x18], %t2; \
ldd [%src - (offset) - 0x10], %t4; \
ldd [%src - (offset) - 0x08], %t6; \
std %t0, [%dst - (offset) - 0x20]; \
std %t2, [%dst - (offset) - 0x18]; \
std %t4, [%dst - (offset) - 0x10]; \
std %t6, [%dst - (offset) - 0x08];
#define RMOVE_LASTCHUNK(src, dst, offset, t0, t1, t2, t3) \
ldd [%src + (offset) + 0x00], %t0; \
ldd [%src + (offset) + 0x08], %t2; \
st %t0, [%dst + (offset) + 0x00]; \
st %t1, [%dst + (offset) + 0x04]; \
st %t2, [%dst + (offset) + 0x08]; \
st %t3, [%dst + (offset) + 0x0c];
#define RMOVE_SHORTCHUNK(src, dst, offset, t0, t1) \
ldub [%src + (offset) + 0x00], %t0; \
ldub [%src + (offset) + 0x01], %t1; \
stb %t0, [%dst + (offset) + 0x00]; \
stb %t1, [%dst + (offset) + 0x01];
#define SMOVE_CHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, prev, shil, shir, offset2) \
ldd [%src + (offset) + 0x00], %t0; \
ldd [%src + (offset) + 0x08], %t2; \
srl %t0, shir, %t5; \
srl %t1, shir, %t6; \
sll %t0, shil, %t0; \
or %t5, %prev, %t5; \
sll %t1, shil, %prev; \
or %t6, %t0, %t0; \
srl %t2, shir, %t1; \
srl %t3, shir, %t6; \
sll %t2, shil, %t2; \
or %t1, %prev, %t1; \
std %t4, [%dst + (offset) + (offset2) - 0x04]; \
std %t0, [%dst + (offset) + (offset2) + 0x04]; \
sll %t3, shil, %prev; \
or %t6, %t2, %t4;
#define SMOVE_ALIGNCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, prev, shil, shir, offset2) \
ldd [%src + (offset) + 0x00], %t0; \
ldd [%src + (offset) + 0x08], %t2; \
srl %t0, shir, %t4; \
srl %t1, shir, %t5; \
sll %t0, shil, %t6; \
or %t4, %prev, %t0; \
sll %t1, shil, %prev; \
or %t5, %t6, %t1; \
srl %t2, shir, %t4; \
srl %t3, shir, %t5; \
sll %t2, shil, %t6; \
or %t4, %prev, %t2; \
sll %t3, shil, %prev; \
or %t5, %t6, %t3; \
std %t0, [%dst + (offset) + (offset2) + 0x00]; \
std %t2, [%dst + (offset) + (offset2) + 0x08];
.text
.align 4
0:
retl
nop ! Only bcopy returns here and it retuns void...
#ifdef __KERNEL__
FUNC(amemmove)
FUNC(__memmove)
#endif
FUNC(memmove)
cmp %o0, %o1
mov %o0, %g7
bleu 9f
sub %o0, %o1, %o4
add %o1, %o2, %o3
cmp %o3, %o0
bleu 0f
andcc %o4, 3, %o5
add %o1, %o2, %o1
add %o0, %o2, %o0
sub %o1, 1, %o1
sub %o0, 1, %o0
1: /* reverse_bytes */
ldub [%o1], %o4
subcc %o2, 1, %o2
stb %o4, [%o0]
sub %o1, 1, %o1
bne 1b
sub %o0, 1, %o0
retl
mov %g7, %o0
/* NOTE: This code is executed just for the cases,
where %src (=%o1) & 3 is != 0.
We need to align it to 4. So, for (%src & 3)
1 we need to do ldub,lduh
2 lduh
3 just ldub
so even if it looks weird, the branches
are correct here. -jj
*/
78: /* dword_align */
andcc %o1, 1, %g0
be 4f
andcc %o1, 2, %g0
ldub [%o1], %g2
add %o1, 1, %o1
stb %g2, [%o0]
sub %o2, 1, %o2
bne 3f
add %o0, 1, %o0
4:
lduh [%o1], %g2
add %o1, 2, %o1
sth %g2, [%o0]
sub %o2, 2, %o2
b 3f
add %o0, 2, %o0
FUNC(memcpy) /* %o0=dst %o1=src %o2=len */
sub %o0, %o1, %o4
mov %o0, %g7
9:
andcc %o4, 3, %o5
0:
bne 86f
cmp %o2, 15
bleu 90f
andcc %o1, 3, %g0
bne 78b
3:
andcc %o1, 4, %g0
be 2f
mov %o2, %g1
ld [%o1], %o4
sub %g1, 4, %g1
st %o4, [%o0]
add %o1, 4, %o1
add %o0, 4, %o0
2:
andcc %g1, 0xffffff80, %g0
be 3f
andcc %o0, 4, %g0
be 82f + 4
5:
MOVE_BIGCHUNK(o1, o0, 0x00, o2, o3, o4, o5, g2, g3, g4, g5)
MOVE_BIGCHUNK(o1, o0, 0x20, o2, o3, o4, o5, g2, g3, g4, g5)
MOVE_BIGCHUNK(o1, o0, 0x40, o2, o3, o4, o5, g2, g3, g4, g5)
MOVE_BIGCHUNK(o1, o0, 0x60, o2, o3, o4, o5, g2, g3, g4, g5)
sub %g1, 128, %g1
add %o1, 128, %o1
cmp %g1, 128
bge 5b
add %o0, 128, %o0
3:
andcc %g1, 0x70, %g4
be 80f
andcc %g1, 8, %g0
sethi %hi(80f), %o5
srl %g4, 1, %o4
add %g4, %o4, %o4
add %o1, %g4, %o1
sub %o5, %o4, %o5
jmpl %o5 + %lo(80f), %g0
add %o0, %g4, %o0
79: /* memcpy_table */
MOVE_LASTCHUNK(o1, o0, 0x60, g2, g3, g4, g5)
MOVE_LASTCHUNK(o1, o0, 0x50, g2, g3, g4, g5)
MOVE_LASTCHUNK(o1, o0, 0x40, g2, g3, g4, g5)
MOVE_LASTCHUNK(o1, o0, 0x30, g2, g3, g4, g5)
MOVE_LASTCHUNK(o1, o0, 0x20, g2, g3, g4, g5)
MOVE_LASTCHUNK(o1, o0, 0x10, g2, g3, g4, g5)
MOVE_LASTCHUNK(o1, o0, 0x00, g2, g3, g4, g5)
80: /* memcpy_table_end */
be 81f
andcc %g1, 4, %g0
ldd [%o1], %g2
add %o0, 8, %o0
st %g2, [%o0 - 0x08]
add %o1, 8, %o1
st %g3, [%o0 - 0x04]
81: /* memcpy_last7 */
be 1f
andcc %g1, 2, %g0
ld [%o1], %g2
add %o1, 4, %o1
st %g2, [%o0]
add %o0, 4, %o0
1:
be 1f
andcc %g1, 1, %g0
lduh [%o1], %g2
add %o1, 2, %o1
sth %g2, [%o0]
add %o0, 2, %o0
1:
be 1f
nop
ldub [%o1], %g2
stb %g2, [%o0]
1:
retl
mov %g7, %o0
82: /* ldd_std */
MOVE_BIGALIGNCHUNK(o1, o0, 0x00, o2, o3, o4, o5, g2, g3, g4, g5)
MOVE_BIGALIGNCHUNK(o1, o0, 0x20, o2, o3, o4, o5, g2, g3, g4, g5)
MOVE_BIGALIGNCHUNK(o1, o0, 0x40, o2, o3, o4, o5, g2, g3, g4, g5)
MOVE_BIGALIGNCHUNK(o1, o0, 0x60, o2, o3, o4, o5, g2, g3, g4, g5)
subcc %g1, 128, %g1
add %o1, 128, %o1
cmp %g1, 128
bge 82b
add %o0, 128, %o0
andcc %g1, 0x70, %g4
be 84f
andcc %g1, 8, %g0
sethi %hi(84f), %o5
add %o1, %g4, %o1
sub %o5, %g4, %o5
jmpl %o5 + %lo(84f), %g0
add %o0, %g4, %o0
83: /* amemcpy_table */
MOVE_LASTALIGNCHUNK(o1, o0, 0x60, g2, g3, g4, g5)
MOVE_LASTALIGNCHUNK(o1, o0, 0x50, g2, g3, g4, g5)
MOVE_LASTALIGNCHUNK(o1, o0, 0x40, g2, g3, g4, g5)
MOVE_LASTALIGNCHUNK(o1, o0, 0x30, g2, g3, g4, g5)
MOVE_LASTALIGNCHUNK(o1, o0, 0x20, g2, g3, g4, g5)
MOVE_LASTALIGNCHUNK(o1, o0, 0x10, g2, g3, g4, g5)
MOVE_LASTALIGNCHUNK(o1, o0, 0x00, g2, g3, g4, g5)
84: /* amemcpy_table_end */
be 85f
andcc %g1, 4, %g0
ldd [%o1], %g2
add %o0, 8, %o0
std %g2, [%o0 - 0x08]
add %o1, 8, %o1
85: /* amemcpy_last7 */
be 1f
andcc %g1, 2, %g0
ld [%o1], %g2
add %o1, 4, %o1
st %g2, [%o0]
add %o0, 4, %o0
1:
be 1f
andcc %g1, 1, %g0
lduh [%o1], %g2
add %o1, 2, %o1
sth %g2, [%o0]
add %o0, 2, %o0
1:
be 1f
nop
ldub [%o1], %g2
stb %g2, [%o0]
1:
retl
mov %g7, %o0
86: /* non_aligned */
cmp %o2, 6
bleu 88f
nop
save %sp, -96, %sp
andcc %i0, 3, %g0
be 61f
andcc %i0, 1, %g0
be 60f
andcc %i0, 2, %g0
ldub [%i1], %g5
add %i1, 1, %i1
stb %g5, [%i0]
sub %i2, 1, %i2
bne 61f
add %i0, 1, %i0
60:
ldub [%i1], %g3
add %i1, 2, %i1
stb %g3, [%i0]
sub %i2, 2, %i2
ldub [%i1 - 1], %g3
add %i0, 2, %i0
stb %g3, [%i0 - 1]
61:
and %i1, 3, %g2
and %i2, 0xc, %g3
and %i1, -4, %i1
cmp %g3, 4
sll %g2, 3, %g4
mov 32, %g2
be 4f
sub %g2, %g4, %l0
blu 3f
cmp %g3, 0x8
be 2f
srl %i2, 2, %g3
ld [%i1], %i3
add %i0, -8, %i0
ld [%i1 + 4], %i4
b 8f
add %g3, 1, %g3
2:
ld [%i1], %i4
add %i0, -12, %i0
ld [%i1 + 4], %i5
add %g3, 2, %g3
b 9f
add %i1, -4, %i1
3:
ld [%i1], %g1
add %i0, -4, %i0
ld [%i1 + 4], %i3
srl %i2, 2, %g3
b 7f
add %i1, 4, %i1
4:
ld [%i1], %i5
cmp %i2, 7
ld [%i1 + 4], %g1
srl %i2, 2, %g3
bleu 10f
add %i1, 8, %i1
ld [%i1], %i3
add %g3, -1, %g3
5:
sll %i5, %g4, %g2
srl %g1, %l0, %g5
or %g2, %g5, %g2
st %g2, [%i0]
7:
ld [%i1 + 4], %i4
sll %g1, %g4, %g2
srl %i3, %l0, %g5
or %g2, %g5, %g2
st %g2, [%i0 + 4]
8:
ld [%i1 + 8], %i5
sll %i3, %g4, %g2
srl %i4, %l0, %g5
or %g2, %g5, %g2
st %g2, [%i0 + 8]
9:
ld [%i1 + 12], %g1
sll %i4, %g4, %g2
srl %i5, %l0, %g5
addcc %g3, -4, %g3
or %g2, %g5, %g2
add %i1, 16, %i1
st %g2, [%i0 + 12]
add %i0, 16, %i0
bne,a 5b
ld [%i1], %i3
10:
sll %i5, %g4, %g2
srl %g1, %l0, %g5
srl %l0, 3, %g3
or %g2, %g5, %g2
sub %i1, %g3, %i1
andcc %i2, 2, %g0
st %g2, [%i0]
be 1f
andcc %i2, 1, %g0
ldub [%i1], %g2
add %i1, 2, %i1
stb %g2, [%i0 + 4]
add %i0, 2, %i0
ldub [%i1 - 1], %g2
stb %g2, [%i0 + 3]
1:
be 1f
nop
ldub [%i1], %g2
stb %g2, [%i0 + 4]
1:
ret
restore %g7, %g0, %o0
88: /* short_end */
and %o2, 0xe, %o3
20:
sethi %hi(89f), %o5
sll %o3, 3, %o4
add %o0, %o3, %o0
sub %o5, %o4, %o5
add %o1, %o3, %o1
jmpl %o5 + %lo(89f), %g0
andcc %o2, 1, %g0
MOVE_SHORTCHUNK(o1, o0, 0x0c, g2, g3)
MOVE_SHORTCHUNK(o1, o0, 0x0a, g2, g3)
MOVE_SHORTCHUNK(o1, o0, 0x08, g2, g3)
MOVE_SHORTCHUNK(o1, o0, 0x06, g2, g3)
MOVE_SHORTCHUNK(o1, o0, 0x04, g2, g3)
MOVE_SHORTCHUNK(o1, o0, 0x02, g2, g3)
MOVE_SHORTCHUNK(o1, o0, 0x00, g2, g3)
89: /* short_table_end */
be 1f
nop
ldub [%o1], %g2
stb %g2, [%o0]
1:
retl
mov %g7, %o0
90: /* short_aligned_end */
bne 88b
andcc %o2, 8, %g0
be 1f
andcc %o2, 4, %g0
ld [%o1 + 0x00], %g2
ld [%o1 + 0x04], %g3
add %o1, 8, %o1
st %g2, [%o0 + 0x00]
st %g3, [%o0 + 0x04]
add %o0, 8, %o0
1:
b 81b
mov %o2, %g1
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