mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 17:54:13 +08:00
40bdac7dbc
This is an implementation of a suggestion made by Chris Torek:
--------------------
Something else I noticed in passing: the EX and EX_LD/EX_ST macros
scattered throughout the various .S files make a fair bit of .fixup
code, all of which does the same thing. At the cost of one symbol
in copy_in_user.S, you could just have one common two-instruction
retl-and-mov-1 fixup that they all share.
--------------------
The following is with a defconfig build:
text data bss dec hex filename
3972767 344024 584449 4901240 4ac978 vmlinux.orig
3968887 344024 584449 4897360 4aba50 vmlinux
Signed-off-by: David S. Miller <davem@davemloft.net>
157 lines
3.2 KiB
ArmAsm
157 lines
3.2 KiB
ArmAsm
/* GENbzero.S: Generic sparc64 memset/clear_user.
|
|
*
|
|
* Copyright (C) 2007 David S. Miller (davem@davemloft.net)
|
|
*/
|
|
#include <asm/asi.h>
|
|
|
|
#define EX_ST(x,y) \
|
|
98: x,y; \
|
|
.section __ex_table,"a";\
|
|
.align 4; \
|
|
.word 98b, __retl_o1; \
|
|
.text; \
|
|
.align 4;
|
|
|
|
.align 32
|
|
.text
|
|
|
|
.globl GENmemset
|
|
.type GENmemset, #function
|
|
GENmemset: /* %o0=buf, %o1=pat, %o2=len */
|
|
and %o1, 0xff, %o3
|
|
mov %o2, %o1
|
|
sllx %o3, 8, %g1
|
|
or %g1, %o3, %o2
|
|
sllx %o2, 16, %g1
|
|
or %g1, %o2, %o2
|
|
sllx %o2, 32, %g1
|
|
ba,pt %xcc, 1f
|
|
or %g1, %o2, %o2
|
|
|
|
.globl GENbzero
|
|
.type GENbzero, #function
|
|
GENbzero:
|
|
clr %o2
|
|
1: brz,pn %o1, GENbzero_return
|
|
mov %o0, %o3
|
|
|
|
/* %o5: saved %asi, restored at GENbzero_done
|
|
* %o4: store %asi to use
|
|
*/
|
|
rd %asi, %o5
|
|
mov ASI_P, %o4
|
|
wr %o4, 0x0, %asi
|
|
|
|
GENbzero_from_clear_user:
|
|
cmp %o1, 15
|
|
bl,pn %icc, GENbzero_tiny
|
|
andcc %o0, 0x7, %g1
|
|
be,pt %xcc, 2f
|
|
mov 8, %g2
|
|
sub %g2, %g1, %g1
|
|
sub %o1, %g1, %o1
|
|
1: EX_ST(stba %o2, [%o0 + 0x00] %asi)
|
|
subcc %g1, 1, %g1
|
|
bne,pt %xcc, 1b
|
|
add %o0, 1, %o0
|
|
2: cmp %o1, 128
|
|
bl,pn %icc, GENbzero_medium
|
|
andcc %o0, (64 - 1), %g1
|
|
be,pt %xcc, GENbzero_pre_loop
|
|
mov 64, %g2
|
|
sub %g2, %g1, %g1
|
|
sub %o1, %g1, %o1
|
|
1: EX_ST(stxa %o2, [%o0 + 0x00] %asi)
|
|
subcc %g1, 8, %g1
|
|
bne,pt %xcc, 1b
|
|
add %o0, 8, %o0
|
|
|
|
GENbzero_pre_loop:
|
|
andn %o1, (64 - 1), %g1
|
|
sub %o1, %g1, %o1
|
|
GENbzero_loop:
|
|
EX_ST(stxa %o2, [%o0 + 0x00] %asi)
|
|
EX_ST(stxa %o2, [%o0 + 0x08] %asi)
|
|
EX_ST(stxa %o2, [%o0 + 0x10] %asi)
|
|
EX_ST(stxa %o2, [%o0 + 0x18] %asi)
|
|
EX_ST(stxa %o2, [%o0 + 0x20] %asi)
|
|
EX_ST(stxa %o2, [%o0 + 0x28] %asi)
|
|
EX_ST(stxa %o2, [%o0 + 0x30] %asi)
|
|
EX_ST(stxa %o2, [%o0 + 0x38] %asi)
|
|
subcc %g1, 64, %g1
|
|
bne,pt %xcc, GENbzero_loop
|
|
add %o0, 64, %o0
|
|
|
|
membar #Sync
|
|
wr %o4, 0x0, %asi
|
|
brz,pn %o1, GENbzero_done
|
|
GENbzero_medium:
|
|
andncc %o1, 0x7, %g1
|
|
be,pn %xcc, 2f
|
|
sub %o1, %g1, %o1
|
|
1: EX_ST(stxa %o2, [%o0 + 0x00] %asi)
|
|
subcc %g1, 8, %g1
|
|
bne,pt %xcc, 1b
|
|
add %o0, 8, %o0
|
|
2: brz,pt %o1, GENbzero_done
|
|
nop
|
|
|
|
GENbzero_tiny:
|
|
1: EX_ST(stba %o2, [%o0 + 0x00] %asi)
|
|
subcc %o1, 1, %o1
|
|
bne,pt %icc, 1b
|
|
add %o0, 1, %o0
|
|
|
|
/* fallthrough */
|
|
|
|
GENbzero_done:
|
|
wr %o5, 0x0, %asi
|
|
|
|
GENbzero_return:
|
|
retl
|
|
mov %o3, %o0
|
|
.size GENbzero, .-GENbzero
|
|
.size GENmemset, .-GENmemset
|
|
|
|
.globl GENclear_user
|
|
.type GENclear_user, #function
|
|
GENclear_user: /* %o0=buf, %o1=len */
|
|
rd %asi, %o5
|
|
brz,pn %o1, GENbzero_done
|
|
clr %o3
|
|
cmp %o5, ASI_AIUS
|
|
bne,pn %icc, GENbzero
|
|
clr %o2
|
|
ba,pt %xcc, GENbzero_from_clear_user
|
|
mov ASI_AIUS, %o4
|
|
.size GENclear_user, .-GENclear_user
|
|
|
|
#define BRANCH_ALWAYS 0x10680000
|
|
#define NOP 0x01000000
|
|
#define GEN_DO_PATCH(OLD, NEW) \
|
|
sethi %hi(NEW), %g1; \
|
|
or %g1, %lo(NEW), %g1; \
|
|
sethi %hi(OLD), %g2; \
|
|
or %g2, %lo(OLD), %g2; \
|
|
sub %g1, %g2, %g1; \
|
|
sethi %hi(BRANCH_ALWAYS), %g3; \
|
|
sll %g1, 11, %g1; \
|
|
srl %g1, 11 + 2, %g1; \
|
|
or %g3, %lo(BRANCH_ALWAYS), %g3; \
|
|
or %g3, %g1, %g3; \
|
|
stw %g3, [%g2]; \
|
|
sethi %hi(NOP), %g3; \
|
|
or %g3, %lo(NOP), %g3; \
|
|
stw %g3, [%g2 + 0x4]; \
|
|
flush %g2;
|
|
|
|
.globl generic_patch_bzero
|
|
.type generic_patch_bzero,#function
|
|
generic_patch_bzero:
|
|
GEN_DO_PATCH(memset, GENmemset)
|
|
GEN_DO_PATCH(__bzero, GENbzero)
|
|
GEN_DO_PATCH(__clear_user, GENclear_user)
|
|
retl
|
|
nop
|
|
.size generic_patch_bzero,.-generic_patch_bzero
|