395 строки
9.4 KiB
ArmAsm
395 строки
9.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* copy_user.S: Sparc optimized copy_from_user and copy_to_user code.
|
|
*
|
|
* Copyright(C) 1995 Linus Torvalds
|
|
* Copyright(C) 1996 David S. Miller
|
|
* Copyright(C) 1996 Eddie C. Dost
|
|
* Copyright(C) 1996,1998 Jakub Jelinek
|
|
*
|
|
* derived from:
|
|
* e-mail between David and Eddie.
|
|
*
|
|
* Returns 0 if successful, otherwise count of bytes not copied yet
|
|
*/
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/asmmacro.h>
|
|
#include <asm/page.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/export.h>
|
|
|
|
/* Work around cpp -rob */
|
|
#define ALLOC #alloc
|
|
#define EXECINSTR #execinstr
|
|
|
|
#define EX_ENTRY(l1, l2) \
|
|
.section __ex_table,ALLOC; \
|
|
.align 4; \
|
|
.word l1, l2; \
|
|
.text;
|
|
|
|
#define EX(x,y,a,b) \
|
|
98: x,y; \
|
|
.section .fixup,ALLOC,EXECINSTR; \
|
|
.align 4; \
|
|
99: retl; \
|
|
a, b, %o0; \
|
|
EX_ENTRY(98b, 99b)
|
|
|
|
#define EX2(x,y,c,d,e,a,b) \
|
|
98: x,y; \
|
|
.section .fixup,ALLOC,EXECINSTR; \
|
|
.align 4; \
|
|
99: c, d, e; \
|
|
retl; \
|
|
a, b, %o0; \
|
|
EX_ENTRY(98b, 99b)
|
|
|
|
#define EXO2(x,y) \
|
|
98: x, y; \
|
|
EX_ENTRY(98b, 97f)
|
|
|
|
#define LD(insn, src, offset, reg, label) \
|
|
98: insn [%src + (offset)], %reg; \
|
|
.section .fixup,ALLOC,EXECINSTR; \
|
|
99: ba label; \
|
|
mov offset, %g5; \
|
|
EX_ENTRY(98b, 99b)
|
|
|
|
#define ST(insn, dst, offset, reg, label) \
|
|
98: insn %reg, [%dst + (offset)]; \
|
|
.section .fixup,ALLOC,EXECINSTR; \
|
|
99: ba label; \
|
|
mov offset, %g5; \
|
|
EX_ENTRY(98b, 99b)
|
|
|
|
/* Both these macros have to start with exactly the same insn */
|
|
/* left: g7 + (g1 % 128) - offset */
|
|
#define MOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
|
|
LD(ldd, src, offset + 0x00, t0, bigchunk_fault) \
|
|
LD(ldd, src, offset + 0x08, t2, bigchunk_fault) \
|
|
LD(ldd, src, offset + 0x10, t4, bigchunk_fault) \
|
|
LD(ldd, src, offset + 0x18, t6, bigchunk_fault) \
|
|
ST(st, dst, offset + 0x00, t0, bigchunk_fault) \
|
|
ST(st, dst, offset + 0x04, t1, bigchunk_fault) \
|
|
ST(st, dst, offset + 0x08, t2, bigchunk_fault) \
|
|
ST(st, dst, offset + 0x0c, t3, bigchunk_fault) \
|
|
ST(st, dst, offset + 0x10, t4, bigchunk_fault) \
|
|
ST(st, dst, offset + 0x14, t5, bigchunk_fault) \
|
|
ST(st, dst, offset + 0x18, t6, bigchunk_fault) \
|
|
ST(st, dst, offset + 0x1c, t7, bigchunk_fault)
|
|
|
|
/* left: g7 + (g1 % 128) - offset */
|
|
#define MOVE_BIGALIGNCHUNK(src, dst, offset, t0, t1, t2, t3, t4, t5, t6, t7) \
|
|
LD(ldd, src, offset + 0x00, t0, bigchunk_fault) \
|
|
LD(ldd, src, offset + 0x08, t2, bigchunk_fault) \
|
|
LD(ldd, src, offset + 0x10, t4, bigchunk_fault) \
|
|
LD(ldd, src, offset + 0x18, t6, bigchunk_fault) \
|
|
ST(std, dst, offset + 0x00, t0, bigchunk_fault) \
|
|
ST(std, dst, offset + 0x08, t2, bigchunk_fault) \
|
|
ST(std, dst, offset + 0x10, t4, bigchunk_fault) \
|
|
ST(std, dst, offset + 0x18, t6, bigchunk_fault)
|
|
|
|
.section .fixup,#alloc,#execinstr
|
|
bigchunk_fault:
|
|
sub %g7, %g5, %o0
|
|
and %g1, 127, %g1
|
|
retl
|
|
add %o0, %g1, %o0
|
|
|
|
/* left: offset + 16 + (g1 % 16) */
|
|
#define MOVE_LASTCHUNK(src, dst, offset, t0, t1, t2, t3) \
|
|
LD(ldd, src, -(offset + 0x10), t0, lastchunk_fault) \
|
|
LD(ldd, src, -(offset + 0x08), t2, lastchunk_fault) \
|
|
ST(st, dst, -(offset + 0x10), t0, lastchunk_fault) \
|
|
ST(st, dst, -(offset + 0x0c), t1, lastchunk_fault) \
|
|
ST(st, dst, -(offset + 0x08), t2, lastchunk_fault) \
|
|
ST(st, dst, -(offset + 0x04), t3, lastchunk_fault)
|
|
|
|
.section .fixup,#alloc,#execinstr
|
|
lastchunk_fault:
|
|
and %g1, 15, %g1
|
|
retl
|
|
sub %g1, %g5, %o0
|
|
|
|
/* left: o3 + (o2 % 16) - offset */
|
|
#define MOVE_HALFCHUNK(src, dst, offset, t0, t1, t2, t3) \
|
|
LD(lduh, src, offset + 0x00, t0, halfchunk_fault) \
|
|
LD(lduh, src, offset + 0x02, t1, halfchunk_fault) \
|
|
LD(lduh, src, offset + 0x04, t2, halfchunk_fault) \
|
|
LD(lduh, src, offset + 0x06, t3, halfchunk_fault) \
|
|
ST(sth, dst, offset + 0x00, t0, halfchunk_fault) \
|
|
ST(sth, dst, offset + 0x02, t1, halfchunk_fault) \
|
|
ST(sth, dst, offset + 0x04, t2, halfchunk_fault) \
|
|
ST(sth, dst, offset + 0x06, t3, halfchunk_fault)
|
|
|
|
/* left: o3 + (o2 % 16) + offset + 2 */
|
|
#define MOVE_SHORTCHUNK(src, dst, offset, t0, t1) \
|
|
LD(ldub, src, -(offset + 0x02), t0, halfchunk_fault) \
|
|
LD(ldub, src, -(offset + 0x01), t1, halfchunk_fault) \
|
|
ST(stb, dst, -(offset + 0x02), t0, halfchunk_fault) \
|
|
ST(stb, dst, -(offset + 0x01), t1, halfchunk_fault)
|
|
|
|
.section .fixup,#alloc,#execinstr
|
|
halfchunk_fault:
|
|
and %o2, 15, %o2
|
|
sub %o3, %g5, %o3
|
|
retl
|
|
add %o2, %o3, %o0
|
|
|
|
/* left: offset + 2 + (o2 % 2) */
|
|
#define MOVE_LAST_SHORTCHUNK(src, dst, offset, t0, t1) \
|
|
LD(ldub, src, -(offset + 0x02), t0, last_shortchunk_fault) \
|
|
LD(ldub, src, -(offset + 0x01), t1, last_shortchunk_fault) \
|
|
ST(stb, dst, -(offset + 0x02), t0, last_shortchunk_fault) \
|
|
ST(stb, dst, -(offset + 0x01), t1, last_shortchunk_fault)
|
|
|
|
.section .fixup,#alloc,#execinstr
|
|
last_shortchunk_fault:
|
|
and %o2, 1, %o2
|
|
retl
|
|
sub %o2, %g5, %o0
|
|
|
|
.text
|
|
.align 4
|
|
|
|
.globl __copy_user_begin
|
|
__copy_user_begin:
|
|
|
|
.globl __copy_user
|
|
EXPORT_SYMBOL(__copy_user)
|
|
dword_align:
|
|
andcc %o1, 1, %g0
|
|
be 4f
|
|
andcc %o1, 2, %g0
|
|
|
|
EXO2(ldub [%o1], %g2)
|
|
add %o1, 1, %o1
|
|
EXO2(stb %g2, [%o0])
|
|
sub %o2, 1, %o2
|
|
bne 3f
|
|
add %o0, 1, %o0
|
|
|
|
EXO2(lduh [%o1], %g2)
|
|
add %o1, 2, %o1
|
|
EXO2(sth %g2, [%o0])
|
|
sub %o2, 2, %o2
|
|
b 3f
|
|
add %o0, 2, %o0
|
|
4:
|
|
EXO2(lduh [%o1], %g2)
|
|
add %o1, 2, %o1
|
|
EXO2(sth %g2, [%o0])
|
|
sub %o2, 2, %o2
|
|
b 3f
|
|
add %o0, 2, %o0
|
|
|
|
__copy_user: /* %o0=dst %o1=src %o2=len */
|
|
xor %o0, %o1, %o4
|
|
1:
|
|
andcc %o4, 3, %o5
|
|
2:
|
|
bne cannot_optimize
|
|
cmp %o2, 15
|
|
|
|
bleu short_aligned_end
|
|
andcc %o1, 3, %g0
|
|
|
|
bne dword_align
|
|
3:
|
|
andcc %o1, 4, %g0
|
|
|
|
be 2f
|
|
mov %o2, %g1
|
|
|
|
EXO2(ld [%o1], %o4)
|
|
sub %g1, 4, %g1
|
|
EXO2(st %o4, [%o0])
|
|
add %o1, 4, %o1
|
|
add %o0, 4, %o0
|
|
2:
|
|
andcc %g1, 0xffffff80, %g7
|
|
be 3f
|
|
andcc %o0, 4, %g0
|
|
|
|
be ldd_std + 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)
|
|
subcc %g7, 128, %g7
|
|
add %o1, 128, %o1
|
|
bne 5b
|
|
add %o0, 128, %o0
|
|
3:
|
|
andcc %g1, 0x70, %g7
|
|
be copy_user_table_end
|
|
andcc %g1, 8, %g0
|
|
|
|
sethi %hi(copy_user_table_end), %o5
|
|
srl %g7, 1, %o4
|
|
add %g7, %o4, %o4
|
|
add %o1, %g7, %o1
|
|
sub %o5, %o4, %o5
|
|
jmpl %o5 + %lo(copy_user_table_end), %g0
|
|
add %o0, %g7, %o0
|
|
|
|
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)
|
|
copy_user_table_end:
|
|
be copy_user_last7
|
|
andcc %g1, 4, %g0
|
|
|
|
EX(ldd [%o1], %g2, and %g1, 0xf)
|
|
add %o0, 8, %o0
|
|
add %o1, 8, %o1
|
|
EX(st %g2, [%o0 - 0x08], and %g1, 0xf)
|
|
EX2(st %g3, [%o0 - 0x04], and %g1, 0xf, %g1, sub %g1, 4)
|
|
copy_user_last7:
|
|
be 1f
|
|
andcc %g1, 2, %g0
|
|
|
|
EX(ld [%o1], %g2, and %g1, 7)
|
|
add %o1, 4, %o1
|
|
EX(st %g2, [%o0], and %g1, 7)
|
|
add %o0, 4, %o0
|
|
1:
|
|
be 1f
|
|
andcc %g1, 1, %g0
|
|
|
|
EX(lduh [%o1], %g2, and %g1, 3)
|
|
add %o1, 2, %o1
|
|
EX(sth %g2, [%o0], and %g1, 3)
|
|
add %o0, 2, %o0
|
|
1:
|
|
be 1f
|
|
nop
|
|
|
|
EX(ldub [%o1], %g2, add %g0, 1)
|
|
EX(stb %g2, [%o0], add %g0, 1)
|
|
1:
|
|
retl
|
|
clr %o0
|
|
|
|
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 %g7, 128, %g7
|
|
add %o1, 128, %o1
|
|
bne ldd_std
|
|
add %o0, 128, %o0
|
|
|
|
andcc %g1, 0x70, %g7
|
|
be copy_user_table_end
|
|
andcc %g1, 8, %g0
|
|
|
|
sethi %hi(copy_user_table_end), %o5
|
|
srl %g7, 1, %o4
|
|
add %g7, %o4, %o4
|
|
add %o1, %g7, %o1
|
|
sub %o5, %o4, %o5
|
|
jmpl %o5 + %lo(copy_user_table_end), %g0
|
|
add %o0, %g7, %o0
|
|
|
|
cannot_optimize:
|
|
bleu short_end
|
|
cmp %o5, 2
|
|
|
|
bne byte_chunk
|
|
and %o2, 0xfffffff0, %o3
|
|
|
|
andcc %o1, 1, %g0
|
|
be 10f
|
|
nop
|
|
|
|
EXO2(ldub [%o1], %g2)
|
|
add %o1, 1, %o1
|
|
EXO2(stb %g2, [%o0])
|
|
sub %o2, 1, %o2
|
|
andcc %o2, 0xfffffff0, %o3
|
|
be short_end
|
|
add %o0, 1, %o0
|
|
10:
|
|
MOVE_HALFCHUNK(o1, o0, 0x00, g2, g3, g4, g5)
|
|
MOVE_HALFCHUNK(o1, o0, 0x08, g2, g3, g4, g5)
|
|
subcc %o3, 0x10, %o3
|
|
add %o1, 0x10, %o1
|
|
bne 10b
|
|
add %o0, 0x10, %o0
|
|
b 2f
|
|
and %o2, 0xe, %o3
|
|
|
|
byte_chunk:
|
|
MOVE_SHORTCHUNK(o1, o0, -0x02, g2, g3)
|
|
MOVE_SHORTCHUNK(o1, o0, -0x04, g2, g3)
|
|
MOVE_SHORTCHUNK(o1, o0, -0x06, g2, g3)
|
|
MOVE_SHORTCHUNK(o1, o0, -0x08, g2, g3)
|
|
MOVE_SHORTCHUNK(o1, o0, -0x0a, g2, g3)
|
|
MOVE_SHORTCHUNK(o1, o0, -0x0c, g2, g3)
|
|
MOVE_SHORTCHUNK(o1, o0, -0x0e, g2, g3)
|
|
MOVE_SHORTCHUNK(o1, o0, -0x10, g2, g3)
|
|
subcc %o3, 0x10, %o3
|
|
add %o1, 0x10, %o1
|
|
bne byte_chunk
|
|
add %o0, 0x10, %o0
|
|
|
|
short_end:
|
|
and %o2, 0xe, %o3
|
|
2:
|
|
sethi %hi(short_table_end), %o5
|
|
sll %o3, 3, %o4
|
|
add %o0, %o3, %o0
|
|
sub %o5, %o4, %o5
|
|
add %o1, %o3, %o1
|
|
jmpl %o5 + %lo(short_table_end), %g0
|
|
andcc %o2, 1, %g0
|
|
MOVE_LAST_SHORTCHUNK(o1, o0, 0x0c, g2, g3)
|
|
MOVE_LAST_SHORTCHUNK(o1, o0, 0x0a, g2, g3)
|
|
MOVE_LAST_SHORTCHUNK(o1, o0, 0x08, g2, g3)
|
|
MOVE_LAST_SHORTCHUNK(o1, o0, 0x06, g2, g3)
|
|
MOVE_LAST_SHORTCHUNK(o1, o0, 0x04, g2, g3)
|
|
MOVE_LAST_SHORTCHUNK(o1, o0, 0x02, g2, g3)
|
|
MOVE_LAST_SHORTCHUNK(o1, o0, 0x00, g2, g3)
|
|
short_table_end:
|
|
be 1f
|
|
nop
|
|
EX(ldub [%o1], %g2, add %g0, 1)
|
|
EX(stb %g2, [%o0], add %g0, 1)
|
|
1:
|
|
retl
|
|
clr %o0
|
|
|
|
short_aligned_end:
|
|
bne short_end
|
|
andcc %o2, 8, %g0
|
|
|
|
be 1f
|
|
andcc %o2, 4, %g0
|
|
|
|
EXO2(ld [%o1 + 0x00], %g2)
|
|
EXO2(ld [%o1 + 0x04], %g3)
|
|
add %o1, 8, %o1
|
|
EXO2(st %g2, [%o0 + 0x00])
|
|
EX(st %g3, [%o0 + 0x04], sub %o2, 4)
|
|
add %o0, 8, %o0
|
|
1:
|
|
b copy_user_last7
|
|
mov %o2, %g1
|
|
|
|
.section .fixup,#alloc,#execinstr
|
|
.align 4
|
|
97:
|
|
retl
|
|
mov %o2, %o0
|
|
|
|
.globl __copy_user_end
|
|
__copy_user_end:
|