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/* linux/arch/sparc64/lib/memset.S: Sparc optimized memset, bzero and clear_user code
* Copyright (C) 1991,1996 Free Software Foundation
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
*
* Returns 0, if ok, and number of bytes not yet set if exception
* occurs and we were called as clear_user.
*/
#include <asm/asi.h>
#include <asm/ptrace.h>
#define EX(x,y,a,b,z) \
98: x,y; \
.section .fixup,z##alloc,z##execinstr; \
.align 4; \
99: ba,pt %xcc, 30f; \
a, b, %o0; \
.section __ex_table,z##alloc; \
.align 4; \
.word 98b, 99b; \
.text; \
.align 4
#define EXT(start,end,handler,z) \
.section __ex_table,z##alloc; \
.align 4; \
.word start, 0, end, handler; \
.text; \
.align 4
/* Please don't change these macros, unless you change the logic
* in the .fixup section below as well.
* Store 64 bytes at (BASE + OFFSET) using value SOURCE. */
#define ZERO_BIG_BLOCK(base, offset, source) \
stxa source, [base + offset + 0x00] %asi; \
stxa source, [base + offset + 0x08] %asi; \
stxa source, [base + offset + 0x10] %asi; \
stxa source, [base + offset + 0x18] %asi; \
stxa source, [base + offset + 0x20] %asi; \
stxa source, [base + offset + 0x28] %asi; \
stxa source, [base + offset + 0x30] %asi; \
stxa source, [base + offset + 0x38] %asi;
#define ZERO_LAST_BLOCKS(base, offset, source) \
stxa source, [base - offset - 0x38] %asi; \
stxa source, [base - offset - 0x30] %asi; \
stxa source, [base - offset - 0x28] %asi; \
stxa source, [base - offset - 0x20] %asi; \
stxa source, [base - offset - 0x18] %asi; \
stxa source, [base - offset - 0x10] %asi; \
stxa source, [base - offset - 0x08] %asi; \
stxa source, [base - offset - 0x00] %asi;
.text
.align 4
.globl __bzero, __memset, __bzero_noasi
.globl memset, __memset_start, __memset_end
__memset_start:
__memset:
memset:
and %o1, 0xff, %g3
sll %g3, 8, %g2
or %g3, %g2, %g3
sll %g3, 16, %g2
or %g3, %g2, %g3
mov %o2, %o1
wr %g0, ASI_P, %asi
sllx %g3, 32, %g2
ba,pt %xcc, 1f
or %g3, %g2, %g3
__bzero:
wr %g0, ASI_P, %asi
__bzero_noasi:
mov %g0, %g3
1:
cmp %o1, 7
bleu,pn %xcc, 7f
andcc %o0, 3, %o2
be,a,pt %icc, 4f
andcc %o0, 4, %g0
cmp %o2, 3
be,pn %icc, 2f
EX(stba %g3, [%o0] %asi, sub %o1, 0,#)
cmp %o2, 2
be,pt %icc, 2f
EX(stba %g3, [%o0 + 0x01] %asi, sub %o1, 1,#)
EX(stba %g3, [%o0 + 0x02] %asi, sub %o1, 2,#)
2:
sub %o2, 4, %o2
sub %o0, %o2, %o0
add %o1, %o2, %o1
andcc %o0, 4, %g0
4:
be,a,pt %icc, 2f
andncc %o1, 0x7f, %o3
EX(sta %g3, [%o0] %asi, sub %o1, 0,#)
sub %o1, 4, %o1
add %o0, 4, %o0
andncc %o1, 0x7f, %o3 ! Now everything is 8 aligned and o1 is len to run
2:
be,pn %xcc, 9f
andcc %o1, 0x78, %o2
10:
ZERO_BIG_BLOCK(%o0, 0x00, %g3)
subcc %o3, 128, %o3
ZERO_BIG_BLOCK(%o0, 0x40, %g3)
11:
EXT(10b, 11b, 20f,#)
bne,pt %xcc, 10b
add %o0, 128, %o0
tst %o2
9:
be,pn %xcc, 13f
andcc %o1, 7, %o1
14:
rd %pc, %o4
srl %o2, 1, %o3
sub %o4, %o3, %o4
jmpl %o4 + (13f - 14b), %g0
add %o0, %o2, %o0
12:
ZERO_LAST_BLOCKS(%o0, 0x48, %g3)
ZERO_LAST_BLOCKS(%o0, 0x08, %g3)
13:
be,pn %icc, 8f
andcc %o1, 4, %g0
be,pn %icc, 1f
andcc %o1, 2, %g0
EX(sta %g3, [%o0] %asi, and %o1, 7,#)
add %o0, 4, %o0
1:
be,pn %icc, 1f
andcc %o1, 1, %g0
EX(stha %g3, [%o0] %asi, and %o1, 3,#)
add %o0, 2, %o0
1:
bne,a,pn %icc, 8f
EX(stba %g3, [%o0] %asi, and %o1, 1,#)
8:
retl
clr %o0
7:
be,pn %icc, 13b
orcc %o1, 0, %g0
be,pn %icc, 0f
8:
add %o0, 1, %o0
subcc %o1, 1, %o1
bne,a,pt %icc, 8b
EX(stba %g3, [%o0 - 1] %asi, add %o1, 1,#)
0:
retl
clr %o0
__memset_end:
.section .fixup,#alloc,#execinstr
.align 4
20:
cmp %g2, 8
bleu,pn %xcc, 1f
and %o1, 0x7f, %o1
sub %g2, 9, %g2
add %o3, 64, %o3
1:
sll %g2, 3, %g2
add %o3, %o1, %o0
ba,pt %xcc, 30f
sub %o0, %g2, %o0
21:
mov 8, %o0
and %o1, 7, %o1
sub %o0, %g2, %o0
sll %o0, 3, %o0
ba,pt %xcc, 30f
add %o0, %o1, %o0
30:
/* %o4 is faulting address, %o5 is %pc where fault occured */
save %sp, -160, %sp
mov %i5, %o0
mov %i7, %o1
call lookup_fault
mov %i4, %o2
ret
restore
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