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linux/arch/sh/lib/copy_page.S

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sh: Fixup various PAGE_SIZE == 4096 assumptions. There were a number of places that made evil PAGE_SIZE == 4k assumptions that ended up breaking when trying to play with 8k and 64k page sizes, this fixes those up. The most significant change is the way we load THREAD_SIZE, previously this was done via: mov #(THREAD_SIZE >> 8), reg shll8 reg to avoid a memory access and allow the immediate load. With a 64k PAGE_SIZE, we're out of range for the immediate load size without resorting to special instructions available in later ISAs (movi20s and so on). The "workaround" for this is to bump up the shift to 10 and insert a shll2, which gives a bit more flexibility while still being much cheaper than a memory access. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-11-27 11:06:26 +08:00
/*
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
* copy_page, __copy_user_page, __copy_user implementation of SuperH
*
* Copyright (C) 2001 Niibe Yutaka & Kaz Kojima
* Copyright (C) 2002 Toshinobu Sugioka
sh: Fixup various PAGE_SIZE == 4096 assumptions. There were a number of places that made evil PAGE_SIZE == 4k assumptions that ended up breaking when trying to play with 8k and 64k page sizes, this fixes those up. The most significant change is the way we load THREAD_SIZE, previously this was done via: mov #(THREAD_SIZE >> 8), reg shll8 reg to avoid a memory access and allow the immediate load. With a 64k PAGE_SIZE, we're out of range for the immediate load size without resorting to special instructions available in later ISAs (movi20s and so on). The "workaround" for this is to bump up the shift to 10 and insert a shll2, which gives a bit more flexibility while still being much cheaper than a memory access. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-11-27 11:06:26 +08:00
* Copyright (C) 2006 Paul Mundt
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
*/
#include <linux/linkage.h>
sh: Fixup various PAGE_SIZE == 4096 assumptions. There were a number of places that made evil PAGE_SIZE == 4k assumptions that ended up breaking when trying to play with 8k and 64k page sizes, this fixes those up. The most significant change is the way we load THREAD_SIZE, previously this was done via: mov #(THREAD_SIZE >> 8), reg shll8 reg to avoid a memory access and allow the immediate load. With a 64k PAGE_SIZE, we're out of range for the immediate load size without resorting to special instructions available in later ISAs (movi20s and so on). The "workaround" for this is to bump up the shift to 10 and insert a shll2, which gives a bit more flexibility while still being much cheaper than a memory access. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-11-27 11:06:26 +08:00
#include <asm/page.h>
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
sh: Tidy up various clear_page()/copy_page() definitions. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-11-20 15:51:28 +08:00
* copy_page
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
* @to: P1 address
* @from: P1 address
*
sh: Tidy up various clear_page()/copy_page() definitions. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-11-20 15:51:28 +08:00
* void copy_page(void *to, void *from)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
*/
/*
* r0, r1, r2, r3, r4, r5, r6, r7 --- scratch
sh: Fixup various PAGE_SIZE == 4096 assumptions. There were a number of places that made evil PAGE_SIZE == 4k assumptions that ended up breaking when trying to play with 8k and 64k page sizes, this fixes those up. The most significant change is the way we load THREAD_SIZE, previously this was done via: mov #(THREAD_SIZE >> 8), reg shll8 reg to avoid a memory access and allow the immediate load. With a 64k PAGE_SIZE, we're out of range for the immediate load size without resorting to special instructions available in later ISAs (movi20s and so on). The "workaround" for this is to bump up the shift to 10 and insert a shll2, which gives a bit more flexibility while still being much cheaper than a memory access. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-11-27 11:06:26 +08:00
* r8 --- from + PAGE_SIZE
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
* r9 --- not used
* r10 --- to
* r11 --- from
*/
sh: Tidy up various clear_page()/copy_page() definitions. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-11-20 15:51:28 +08:00
ENTRY(copy_page)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
mov.l r8,@-r15
mov.l r10,@-r15
mov.l r11,@-r15
mov r4,r10
mov r5,r11
mov r5,r8
sh: Fixup various PAGE_SIZE == 4096 assumptions. There were a number of places that made evil PAGE_SIZE == 4k assumptions that ended up breaking when trying to play with 8k and 64k page sizes, this fixes those up. The most significant change is the way we load THREAD_SIZE, previously this was done via: mov #(THREAD_SIZE >> 8), reg shll8 reg to avoid a memory access and allow the immediate load. With a 64k PAGE_SIZE, we're out of range for the immediate load size without resorting to special instructions available in later ISAs (movi20s and so on). The "workaround" for this is to bump up the shift to 10 and insert a shll2, which gives a bit more flexibility while still being much cheaper than a memory access. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-11-27 11:06:26 +08:00
mov.l .Lpsz,r0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
add r0,r8
!
1: mov.l @r11+,r0
mov.l @r11+,r1
mov.l @r11+,r2
mov.l @r11+,r3
mov.l @r11+,r4
mov.l @r11+,r5
mov.l @r11+,r6
mov.l @r11+,r7
#if defined(CONFIG_CPU_SH3)
mov.l r0,@r10
#elif defined(CONFIG_CPU_SH4)
movca.l r0,@r10
mov r10,r0
#endif
add #32,r10
mov.l r7,@-r10
mov.l r6,@-r10
mov.l r5,@-r10
mov.l r4,@-r10
mov.l r3,@-r10
mov.l r2,@-r10
mov.l r1,@-r10
#if defined(CONFIG_CPU_SH4)
ocbwb @r0
#endif
cmp/eq r11,r8
bf/s 1b
add #28,r10
!
mov.l @r15+,r11
mov.l @r15+,r10
mov.l @r15+,r8
rts
nop
sh: Explicit alignment for PAGE_SIZE in copy/clear_page(). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-11-30 15:34:26 +08:00
.balign 4
sh: Fixup various PAGE_SIZE == 4096 assumptions. There were a number of places that made evil PAGE_SIZE == 4k assumptions that ended up breaking when trying to play with 8k and 64k page sizes, this fixes those up. The most significant change is the way we load THREAD_SIZE, previously this was done via: mov #(THREAD_SIZE >> 8), reg shll8 reg to avoid a memory access and allow the immediate load. With a 64k PAGE_SIZE, we're out of range for the immediate load size without resorting to special instructions available in later ISAs (movi20s and so on). The "workaround" for this is to bump up the shift to 10 and insert a shll2, which gives a bit more flexibility while still being much cheaper than a memory access. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2006-11-27 11:06:26 +08:00
.Lpsz: .long PAGE_SIZE
sh: Explicit alignment for PAGE_SIZE in copy/clear_page(). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-11-30 15:34:26 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
* Return the number of bytes NOT copied
*/
#define EX(...) \
9999: __VA_ARGS__ ; \
.section __ex_table, "a"; \
.long 9999b, 6000f ; \
.previous
ENTRY(__copy_user)
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
! Check if small number of bytes
mov #11,r0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
mov r4,r3
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
cmp/gt r0,r6 ! r6 (len) > r0 (11)
bf/s .L_cleanup_loop_no_pop
add r6,r3 ! last destination address
! Calculate bytes needed to align to src
mov.l r11,@-r15
neg r5,r0
mov.l r10,@-r15
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
add #4,r0
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
mov.l r9,@-r15
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
and #3,r0
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
mov.l r8,@-r15
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
tst r0,r0
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
bt 2f
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
1:
! Copy bytes to long word align src
EX( mov.b @r5+,r1 )
dt r0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
add #-1,r6
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
EX( mov.b r1,@r4 )
bf/s 1b
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
add #1,r4
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
! Jump to appropriate routine depending on dest
2: mov #3,r1
mov r6, r2
and r4,r1
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
shlr2 r2
shll2 r1
mova .L_jump_tbl,r0
mov.l @(r0,r1),r1
jmp @r1
nop
.align 2
.L_jump_tbl:
.long .L_dest00
.long .L_dest01
.long .L_dest10
.long .L_dest11
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
/*
* Come here if there are less than 12 bytes to copy
*
* Keep the branch target close, so the bf/s callee doesn't overflow
* and result in a more expensive branch being inserted. This is the
* fast-path for small copies, the jump via the jump table will hit the
* default slow-path cleanup. -PFM.
*/
.L_cleanup_loop_no_pop:
tst r6,r6 ! Check explicitly for zero
bt 1f
2:
EX( mov.b @r5+,r0 )
dt r6
EX( mov.b r0,@r4 )
bf/s 2b
add #1,r4
1: mov #0,r0 ! normal return
5000:
# Exception handler:
.section .fixup, "ax"
6000:
mov.l 8000f,r1
mov r3,r0
jmp @r1
sub r4,r0
.align 2
8000: .long 5000b
.previous
rts
nop
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
! Destination = 00
.L_dest00:
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
! Skip the large copy for small transfers
mov #(32+32-4), r0
cmp/gt r6, r0 ! r0 (60) > r6 (len)
bt 1f
! Align dest to a 32 byte boundary
neg r4,r0
add #0x20, r0
and #0x1f, r0
tst r0, r0
bt 2f
sub r0, r6
shlr2 r0
3:
EX( mov.l @r5+,r1 )
dt r0
EX( mov.l r1,@r4 )
bf/s 3b
add #4,r4
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
2:
EX( mov.l @r5+,r0 )
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
EX( mov.l @r5+,r1 )
EX( mov.l @r5+,r2 )
EX( mov.l @r5+,r7 )
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
EX( mov.l @r5+,r8 )
EX( mov.l @r5+,r9 )
EX( mov.l @r5+,r10 )
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
EX( mov.l @r5+,r11 )
sh: Fix optimized __copy_user() movca.l usage. movca.l is restricted to SH-4 and up only, though compilers that are unable to support ISA tuning (especially older versions of binutils) will happily compile in the bogus opcode on older parts. Conditionalize it to fix SH-3 regressions noted by Kristoffer. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-11-02 11:14:09 +08:00
#ifdef CONFIG_CPU_SH4
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
EX( movca.l r0,@r4 )
sh: Fix optimized __copy_user() movca.l usage. movca.l is restricted to SH-4 and up only, though compilers that are unable to support ISA tuning (especially older versions of binutils) will happily compile in the bogus opcode on older parts. Conditionalize it to fix SH-3 regressions noted by Kristoffer. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-11-02 11:14:09 +08:00
#else
EX( mov.l r0,@r4 )
#endif
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
add #-32, r6
EX( mov.l r1,@(4,r4) )
mov #32, r0
EX( mov.l r2,@(8,r4) )
cmp/gt r6, r0 ! r0 (32) > r6 (len)
EX( mov.l r7,@(12,r4) )
EX( mov.l r8,@(16,r4) )
EX( mov.l r9,@(20,r4) )
EX( mov.l r10,@(24,r4) )
EX( mov.l r11,@(28,r4) )
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
bf/s 2b
add #32,r4
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
1: mov r6, r0
shlr2 r0
tst r0, r0
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
bt .L_cleanup
1:
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
EX( mov.l @r5+,r1 )
dt r0
EX( mov.l r1,@r4 )
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
bf/s 1b
add #4,r4
bra .L_cleanup
nop
! Destination = 10
.L_dest10:
mov r2,r7
shlr2 r7
shlr r7
tst r7,r7
mov #7,r0
bt/s 1f
and r0,r2
2:
dt r7
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
#ifdef CONFIG_CPU_LITTLE_ENDIAN
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
EX( mov.l @r5+,r0 )
EX( mov.l @r5+,r1 )
EX( mov.l @r5+,r8 )
EX( mov.l @r5+,r9 )
EX( mov.l @r5+,r10 )
EX( mov.w r0,@r4 )
add #2,r4
xtrct r1,r0
xtrct r8,r1
xtrct r9,r8
xtrct r10,r9
EX( mov.l r0,@r4 )
EX( mov.l r1,@(4,r4) )
EX( mov.l r8,@(8,r4) )
EX( mov.l r9,@(12,r4) )
EX( mov.l @r5+,r1 )
EX( mov.l @r5+,r8 )
EX( mov.l @r5+,r0 )
xtrct r1,r10
xtrct r8,r1
xtrct r0,r8
shlr16 r0
EX( mov.l r10,@(16,r4) )
EX( mov.l r1,@(20,r4) )
EX( mov.l r8,@(24,r4) )
EX( mov.w r0,@(28,r4) )
bf/s 2b
add #30,r4
#else
EX( mov.l @(28,r5),r0 )
EX( mov.l @(24,r5),r8 )
EX( mov.l @(20,r5),r9 )
EX( mov.l @(16,r5),r10 )
EX( mov.w r0,@(30,r4) )
add #-2,r4
xtrct r8,r0
xtrct r9,r8
xtrct r10,r9
EX( mov.l r0,@(28,r4) )
EX( mov.l r8,@(24,r4) )
EX( mov.l r9,@(20,r4) )
EX( mov.l @(12,r5),r0 )
EX( mov.l @(8,r5),r8 )
xtrct r0,r10
EX( mov.l @(4,r5),r9 )
mov.l r10,@(16,r4)
EX( mov.l @r5,r10 )
xtrct r8,r0
xtrct r9,r8
xtrct r10,r9
EX( mov.l r0,@(12,r4) )
EX( mov.l r8,@(8,r4) )
swap.w r10,r0
EX( mov.l r9,@(4,r4) )
EX( mov.w r0,@(2,r4) )
add #32,r5
bf/s 2b
add #34,r4
#endif
tst r2,r2
bt .L_cleanup
1: ! Read longword, write two words per iteration
EX( mov.l @r5+,r0 )
dt r2
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
#ifdef CONFIG_CPU_LITTLE_ENDIAN
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
EX( mov.w r0,@r4 )
shlr16 r0
EX( mov.w r0,@(2,r4) )
#else
EX( mov.w r0,@(2,r4) )
shlr16 r0
EX( mov.w r0,@r4 )
#endif
bf/s 1b
add #4,r4
bra .L_cleanup
nop
! Destination = 01 or 11
.L_dest01:
.L_dest11:
! Read longword, write byte, word, byte per iteration
EX( mov.l @r5+,r0 )
dt r2
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
#ifdef CONFIG_CPU_LITTLE_ENDIAN
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
EX( mov.b r0,@r4 )
shlr8 r0
add #1,r4
EX( mov.w r0,@r4 )
shlr16 r0
EX( mov.b r0,@(2,r4) )
bf/s .L_dest01
add #3,r4
#else
EX( mov.b r0,@(3,r4) )
shlr8 r0
swap.w r0,r7
EX( mov.b r7,@r4 )
add #1,r4
EX( mov.w r0,@r4 )
bf/s .L_dest01
add #3,r4
#endif
! Cleanup last few bytes
.L_cleanup:
mov r6,r0
and #3,r0
tst r0,r0
bt .L_exit
mov r0,r6
.L_cleanup_loop:
EX( mov.b @r5+,r0 )
dt r6
EX( mov.b r0,@r4 )
bf/s .L_cleanup_loop
add #1,r4
.L_exit:
mov #0,r0 ! normal return
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
5000:
# Exception handler:
.section .fixup, "ax"
6000:
mov.l 8000f,r1
mov r3,r0
jmp @r1
sub r4,r0
.align 2
8000: .long 5000b
.previous
mov.l @r15+,r8
mov.l @r15+,r9
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
mov.l @r15+,r10
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
rts
sh: __copy_user() optimizations for small copies. This implements a fast-path for small (less than 12 bytes) copies, with the existing path treated as the slow-path and left as the default behaviour for all other copy sizes. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-09-28 11:36:35 +08:00
mov.l @r15+,r11