![David S. Miller](/assets/img/avatar_default.png)
Both csum_partial() and the csum_partial_copy*() family of routines forget to do a final fold on the computed checksum value on sparc64. So do the standard Sparc "add + set condition codes, add carry" sequence, then make sure the high 32-bits of the return value are clear. Based upon some excellent detective work and debugging done by Richard Braun and Samuel Thibault. Signed-off-by: David S. Miller <davem@davemloft.net>
310 lines
6.9 KiB
ArmAsm
310 lines
6.9 KiB
ArmAsm
/* csum_copy.S: Checksum+copy code for sparc64
|
|
*
|
|
* Copyright (C) 2005 David S. Miller <davem@davemloft.net>
|
|
*/
|
|
|
|
#ifdef __KERNEL__
|
|
#define GLOBAL_SPARE %g7
|
|
#else
|
|
#define GLOBAL_SPARE %g5
|
|
#endif
|
|
|
|
#ifndef EX_LD
|
|
#define EX_LD(x) x
|
|
#endif
|
|
|
|
#ifndef EX_ST
|
|
#define EX_ST(x) x
|
|
#endif
|
|
|
|
#ifndef EX_RETVAL
|
|
#define EX_RETVAL(x) x
|
|
#endif
|
|
|
|
#ifndef LOAD
|
|
#define LOAD(type,addr,dest) type [addr], dest
|
|
#endif
|
|
|
|
#ifndef STORE
|
|
#define STORE(type,src,addr) type src, [addr]
|
|
#endif
|
|
|
|
#ifndef FUNC_NAME
|
|
#define FUNC_NAME csum_partial_copy_nocheck
|
|
#endif
|
|
|
|
.register %g2, #scratch
|
|
.register %g3, #scratch
|
|
|
|
.text
|
|
|
|
90:
|
|
/* We checked for zero length already, so there must be
|
|
* at least one byte.
|
|
*/
|
|
be,pt %icc, 1f
|
|
nop
|
|
EX_LD(LOAD(ldub, %o0 + 0x00, %o4))
|
|
add %o0, 1, %o0
|
|
sub %o2, 1, %o2
|
|
EX_ST(STORE(stb, %o4, %o1 + 0x00))
|
|
add %o1, 1, %o1
|
|
1: andcc %o0, 0x2, %g0
|
|
be,pn %icc, 80f
|
|
cmp %o2, 2
|
|
blu,pn %icc, 60f
|
|
nop
|
|
EX_LD(LOAD(lduh, %o0 + 0x00, %o5))
|
|
add %o0, 2, %o0
|
|
sub %o2, 2, %o2
|
|
EX_ST(STORE(sth, %o5, %o1 + 0x00))
|
|
add %o1, 2, %o1
|
|
ba,pt %xcc, 80f
|
|
add %o5, %o4, %o4
|
|
|
|
.globl FUNC_NAME
|
|
FUNC_NAME: /* %o0=src, %o1=dst, %o2=len, %o3=sum */
|
|
LOAD(prefetch, %o0 + 0x000, #n_reads)
|
|
xor %o0, %o1, %g1
|
|
clr %o4
|
|
andcc %g1, 0x3, %g0
|
|
bne,pn %icc, 95f
|
|
LOAD(prefetch, %o0 + 0x040, #n_reads)
|
|
|
|
brz,pn %o2, 70f
|
|
andcc %o0, 0x3, %g0
|
|
|
|
/* We "remember" whether the lowest bit in the address
|
|
* was set in GLOBAL_SPARE. Because if it is, we have to swap
|
|
* upper and lower 8 bit fields of the sum we calculate.
|
|
*/
|
|
bne,pn %icc, 90b
|
|
andcc %o0, 0x1, GLOBAL_SPARE
|
|
|
|
80:
|
|
LOAD(prefetch, %o0 + 0x080, #n_reads)
|
|
andncc %o2, 0x3f, %g3
|
|
|
|
LOAD(prefetch, %o0 + 0x0c0, #n_reads)
|
|
sub %o2, %g3, %o2
|
|
brz,pn %g3, 2f
|
|
LOAD(prefetch, %o0 + 0x100, #n_reads)
|
|
|
|
/* So that we don't need to use the non-pairing
|
|
* add-with-carry instructions we accumulate 32-bit
|
|
* values into a 64-bit register. At the end of the
|
|
* loop we fold it down to 32-bits and so on.
|
|
*/
|
|
ba,pt %xcc, 1f
|
|
LOAD(prefetch, %o0 + 0x140, #n_reads)
|
|
|
|
.align 32
|
|
1: EX_LD(LOAD(lduw, %o0 + 0x00, %o5))
|
|
EX_LD(LOAD(lduw, %o0 + 0x04, %g1))
|
|
EX_LD(LOAD(lduw, %o0 + 0x08, %g2))
|
|
add %o4, %o5, %o4
|
|
EX_ST(STORE(stw, %o5, %o1 + 0x00))
|
|
EX_LD(LOAD(lduw, %o0 + 0x0c, %o5))
|
|
add %o4, %g1, %o4
|
|
EX_ST(STORE(stw, %g1, %o1 + 0x04))
|
|
EX_LD(LOAD(lduw, %o0 + 0x10, %g1))
|
|
add %o4, %g2, %o4
|
|
EX_ST(STORE(stw, %g2, %o1 + 0x08))
|
|
EX_LD(LOAD(lduw, %o0 + 0x14, %g2))
|
|
add %o4, %o5, %o4
|
|
EX_ST(STORE(stw, %o5, %o1 + 0x0c))
|
|
EX_LD(LOAD(lduw, %o0 + 0x18, %o5))
|
|
add %o4, %g1, %o4
|
|
EX_ST(STORE(stw, %g1, %o1 + 0x10))
|
|
EX_LD(LOAD(lduw, %o0 + 0x1c, %g1))
|
|
add %o4, %g2, %o4
|
|
EX_ST(STORE(stw, %g2, %o1 + 0x14))
|
|
EX_LD(LOAD(lduw, %o0 + 0x20, %g2))
|
|
add %o4, %o5, %o4
|
|
EX_ST(STORE(stw, %o5, %o1 + 0x18))
|
|
EX_LD(LOAD(lduw, %o0 + 0x24, %o5))
|
|
add %o4, %g1, %o4
|
|
EX_ST(STORE(stw, %g1, %o1 + 0x1c))
|
|
EX_LD(LOAD(lduw, %o0 + 0x28, %g1))
|
|
add %o4, %g2, %o4
|
|
EX_ST(STORE(stw, %g2, %o1 + 0x20))
|
|
EX_LD(LOAD(lduw, %o0 + 0x2c, %g2))
|
|
add %o4, %o5, %o4
|
|
EX_ST(STORE(stw, %o5, %o1 + 0x24))
|
|
EX_LD(LOAD(lduw, %o0 + 0x30, %o5))
|
|
add %o4, %g1, %o4
|
|
EX_ST(STORE(stw, %g1, %o1 + 0x28))
|
|
EX_LD(LOAD(lduw, %o0 + 0x34, %g1))
|
|
add %o4, %g2, %o4
|
|
EX_ST(STORE(stw, %g2, %o1 + 0x2c))
|
|
EX_LD(LOAD(lduw, %o0 + 0x38, %g2))
|
|
add %o4, %o5, %o4
|
|
EX_ST(STORE(stw, %o5, %o1 + 0x30))
|
|
EX_LD(LOAD(lduw, %o0 + 0x3c, %o5))
|
|
add %o4, %g1, %o4
|
|
EX_ST(STORE(stw, %g1, %o1 + 0x34))
|
|
LOAD(prefetch, %o0 + 0x180, #n_reads)
|
|
add %o4, %g2, %o4
|
|
EX_ST(STORE(stw, %g2, %o1 + 0x38))
|
|
subcc %g3, 0x40, %g3
|
|
add %o0, 0x40, %o0
|
|
add %o4, %o5, %o4
|
|
EX_ST(STORE(stw, %o5, %o1 + 0x3c))
|
|
bne,pt %icc, 1b
|
|
add %o1, 0x40, %o1
|
|
|
|
2: and %o2, 0x3c, %g3
|
|
brz,pn %g3, 2f
|
|
sub %o2, %g3, %o2
|
|
1: EX_LD(LOAD(lduw, %o0 + 0x00, %o5))
|
|
subcc %g3, 0x4, %g3
|
|
add %o0, 0x4, %o0
|
|
add %o4, %o5, %o4
|
|
EX_ST(STORE(stw, %o5, %o1 + 0x00))
|
|
bne,pt %icc, 1b
|
|
add %o1, 0x4, %o1
|
|
|
|
2:
|
|
/* fold 64-->32 */
|
|
srlx %o4, 32, %o5
|
|
srl %o4, 0, %o4
|
|
add %o4, %o5, %o4
|
|
srlx %o4, 32, %o5
|
|
srl %o4, 0, %o4
|
|
add %o4, %o5, %o4
|
|
|
|
/* fold 32-->16 */
|
|
sethi %hi(0xffff0000), %g1
|
|
srl %o4, 16, %o5
|
|
andn %o4, %g1, %g2
|
|
add %o5, %g2, %o4
|
|
srl %o4, 16, %o5
|
|
andn %o4, %g1, %g2
|
|
add %o5, %g2, %o4
|
|
|
|
60:
|
|
/* %o4 has the 16-bit sum we have calculated so-far. */
|
|
cmp %o2, 2
|
|
blu,pt %icc, 1f
|
|
nop
|
|
EX_LD(LOAD(lduh, %o0 + 0x00, %o5))
|
|
sub %o2, 2, %o2
|
|
add %o0, 2, %o0
|
|
add %o4, %o5, %o4
|
|
EX_ST(STORE(sth, %o5, %o1 + 0x00))
|
|
add %o1, 0x2, %o1
|
|
1: brz,pt %o2, 1f
|
|
nop
|
|
EX_LD(LOAD(ldub, %o0 + 0x00, %o5))
|
|
sub %o2, 1, %o2
|
|
add %o0, 1, %o0
|
|
EX_ST(STORE(stb, %o5, %o1 + 0x00))
|
|
sllx %o5, 8, %o5
|
|
add %o1, 1, %o1
|
|
add %o4, %o5, %o4
|
|
1:
|
|
/* fold 32-->16 */
|
|
sethi %hi(0xffff0000), %g1
|
|
srl %o4, 16, %o5
|
|
andn %o4, %g1, %g2
|
|
add %o5, %g2, %o4
|
|
srl %o4, 16, %o5
|
|
andn %o4, %g1, %g2
|
|
add %o5, %g2, %o4
|
|
|
|
1: brz,pt GLOBAL_SPARE, 1f
|
|
nop
|
|
|
|
/* We started with an odd byte, byte-swap the result. */
|
|
srl %o4, 8, %o5
|
|
and %o4, 0xff, %g1
|
|
sll %g1, 8, %g1
|
|
or %o5, %g1, %o4
|
|
|
|
1: addcc %o3, %o4, %o3
|
|
addc %g0, %o3, %o3
|
|
|
|
70:
|
|
retl
|
|
srl %o3, 0, %o0
|
|
|
|
95: mov 0, GLOBAL_SPARE
|
|
brlez,pn %o2, 4f
|
|
andcc %o0, 1, %o5
|
|
be,a,pt %icc, 1f
|
|
srl %o2, 1, %g1
|
|
sub %o2, 1, %o2
|
|
EX_LD(LOAD(ldub, %o0, GLOBAL_SPARE))
|
|
add %o0, 1, %o0
|
|
EX_ST(STORE(stb, GLOBAL_SPARE, %o1))
|
|
srl %o2, 1, %g1
|
|
add %o1, 1, %o1
|
|
1: brz,a,pn %g1, 3f
|
|
andcc %o2, 1, %g0
|
|
andcc %o0, 2, %g0
|
|
be,a,pt %icc, 1f
|
|
srl %g1, 1, %g1
|
|
EX_LD(LOAD(lduh, %o0, %o4))
|
|
sub %o2, 2, %o2
|
|
srl %o4, 8, %g2
|
|
sub %g1, 1, %g1
|
|
EX_ST(STORE(stb, %g2, %o1))
|
|
add %o4, GLOBAL_SPARE, GLOBAL_SPARE
|
|
EX_ST(STORE(stb, %o4, %o1 + 1))
|
|
add %o0, 2, %o0
|
|
srl %g1, 1, %g1
|
|
add %o1, 2, %o1
|
|
1: brz,a,pn %g1, 2f
|
|
andcc %o2, 2, %g0
|
|
EX_LD(LOAD(lduw, %o0, %o4))
|
|
5: srl %o4, 24, %g2
|
|
srl %o4, 16, %g3
|
|
EX_ST(STORE(stb, %g2, %o1))
|
|
srl %o4, 8, %g2
|
|
EX_ST(STORE(stb, %g3, %o1 + 1))
|
|
add %o0, 4, %o0
|
|
EX_ST(STORE(stb, %g2, %o1 + 2))
|
|
addcc %o4, GLOBAL_SPARE, GLOBAL_SPARE
|
|
EX_ST(STORE(stb, %o4, %o1 + 3))
|
|
addc GLOBAL_SPARE, %g0, GLOBAL_SPARE
|
|
add %o1, 4, %o1
|
|
subcc %g1, 1, %g1
|
|
bne,a,pt %icc, 5b
|
|
EX_LD(LOAD(lduw, %o0, %o4))
|
|
sll GLOBAL_SPARE, 16, %g2
|
|
srl GLOBAL_SPARE, 16, GLOBAL_SPARE
|
|
srl %g2, 16, %g2
|
|
andcc %o2, 2, %g0
|
|
add %g2, GLOBAL_SPARE, GLOBAL_SPARE
|
|
2: be,a,pt %icc, 3f
|
|
andcc %o2, 1, %g0
|
|
EX_LD(LOAD(lduh, %o0, %o4))
|
|
andcc %o2, 1, %g0
|
|
srl %o4, 8, %g2
|
|
add %o0, 2, %o0
|
|
EX_ST(STORE(stb, %g2, %o1))
|
|
add GLOBAL_SPARE, %o4, GLOBAL_SPARE
|
|
EX_ST(STORE(stb, %o4, %o1 + 1))
|
|
add %o1, 2, %o1
|
|
3: be,a,pt %icc, 1f
|
|
sll GLOBAL_SPARE, 16, %o4
|
|
EX_LD(LOAD(ldub, %o0, %g2))
|
|
sll %g2, 8, %o4
|
|
EX_ST(STORE(stb, %g2, %o1))
|
|
add GLOBAL_SPARE, %o4, GLOBAL_SPARE
|
|
sll GLOBAL_SPARE, 16, %o4
|
|
1: addcc %o4, GLOBAL_SPARE, GLOBAL_SPARE
|
|
srl GLOBAL_SPARE, 16, %o4
|
|
addc %g0, %o4, GLOBAL_SPARE
|
|
brz,pt %o5, 4f
|
|
srl GLOBAL_SPARE, 8, %o4
|
|
and GLOBAL_SPARE, 0xff, %g2
|
|
and %o4, 0xff, %o4
|
|
sll %g2, 8, %g2
|
|
or %g2, %o4, GLOBAL_SPARE
|
|
4: addcc %o3, GLOBAL_SPARE, %o3
|
|
addc %g0, %o3, %o0
|
|
retl
|
|
srl %o0, 0, %o0
|
|
.size FUNC_NAME, .-FUNC_NAME
|