-/* $Id: U3copy_to_user.S,v 1.3 2000/11/01 09:29:19 davem Exp $
- * U3memcpy.S: UltraSparc-III optimized copy to userspace.
+/* U3copy_to_user.S: UltraSparc-III optimized memcpy.
*
- * Copyright (C) 1999, 2000 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
*/
-#ifdef __KERNEL__
#include <asm/visasm.h>
#include <asm/asi.h>
#include <asm/dcu.h>
#include <asm/spitfire.h>
-#undef SMALL_COPY_USES_FPU
+
+#define XCC xcc
+
#define EXNV(x,y,a,b) \
98: x,y; \
.section .fixup; \
.text; \
.align 4;
#define EXNV3(x,y,a,b) \
+98: x,y; \
+ .section .fixup; \
+ .align 4; \
+99: a, b, %o0; \
+ retl; \
+ add %o0, 4, %o0; \
+ .section __ex_table; \
+ .align 4; \
+ .word 98b, 99b; \
+ .text; \
+ .align 4;
+#define EXNV4(x,y,a,b) \
98: x,y; \
.section .fixup; \
.align 4; \
.word 98b, 99b; \
.text; \
.align 4;
-#else
-#define ASI_AIUS 0x80
-#define ASI_BLK_AIUS 0xf0
-#define FPRS_FEF 0x04
-#define VISEntryHalf rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
-#define VISExitHalf and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
-#define SMALL_COPY_USES_FPU
-#define EXNV(x,y,a,b) x,y;
-#define EXNV2(x,y,a,b) x,y;
-#define EXNV3(x,y,a,b) x,y;
-#define EX(x,y,a,b) x,y;
-#define EXBLK1(x,y) x,y;
-#define EXBLK2(x,y) x,y;
-#define EXBLK3(x,y) x,y;
-#define EXBLK4(x,y) x,y;
-#endif
+
+ .register %g2,#scratch
+ .register %g3,#scratch
/* Special/non-trivial issues of this code:
*
* of up to 2.4GB per second.
*/
- .globl U3copy_to_user
-U3copy_to_user: /* %o0=dst, %o1=src, %o2=len */
+ .globl U3copy_to_user
+U3copy_to_user: /* %o0=dst, %o1=src, %o2=len */
/* Writing to %asi is _expensive_ so we hardcode it.
* Reading %asi to check for KERNEL_DS is comparatively
* cheap.
*/
- rd %asi, %g1 ! MS Group (4 cycles)
- cmp %g1, ASI_AIUS ! A0 Group
- bne U3memcpy ! BR
- nop ! A1
-#ifndef __KERNEL__
- /* Save away original 'dst' for memcpy return value. */
- mov %o0, %g3 ! A0 Group
-#endif
- /* Anything to copy at all? */
- cmp %o2, 0 ! A1
- ble,pn %icc, U3copy_to_user_short_ret ! BR
-
- /* Extremely small copy? */
- cmp %o2, 31 ! A0 Group
- ble,pn %icc, U3copy_to_user_short ! BR
-
- /* Large enough to use unrolled prefetch loops? */
- cmp %o2, 0x100 ! A1
- bge,a,pt %icc, U3copy_to_user_enter ! BR Group
- andcc %o0, 0x3f, %g2 ! A0
-
- ba,pt %xcc, U3copy_to_user_toosmall ! BR Group
- andcc %o0, 0x7, %g2 ! A0
-
- .align 32
-U3copy_to_user_short:
- /* Copy %o2 bytes from src to dst, one byte at a time. */
- ldub [%o1 + 0x00], %o3 ! MS Group
- add %o1, 0x1, %o1 ! A0
- add %o0, 0x1, %o0 ! A1
- subcc %o2, 1, %o2 ! A0 Group
-
- bg,pt %icc, U3copy_to_user_short ! BR
- EXNV(stba %o3, [%o0 + -1] %asi, add %o2, 1) ! MS Group (1-cycle stall)
-
-U3copy_to_user_short_ret:
-#ifdef __KERNEL__
- retl ! BR Group (0-4 cycle stall)
- clr %o0 ! A0
-#else
- retl ! BR Group (0-4 cycle stall)
- mov %g3, %o0 ! A0
-#endif
-
- /* Here len >= (6 * 64) and condition codes reflect execution
+ rd %asi, %g1
+ cmp %g1, ASI_AIUS
+ bne,pn %icc, U3memcpy_user_stub
+ nop
+
+ cmp %o2, 0
+ be,pn %XCC, 85f
+ or %o0, %o1, %o3
+ cmp %o2, 16
+ bleu,a,pn %XCC, 80f
+ or %o3, %o2, %o3
+
+ cmp %o2, 256
+ blu,pt %XCC, 70f
+ andcc %o3, 0x7, %g0
+
+ ba,pt %xcc, 1f
+ andcc %o0, 0x3f, %g2
+
+ /* Here len >= 256 and condition codes reflect execution
* of "andcc %o0, 0x7, %g2", done by caller.
*/
.align 64
-U3copy_to_user_enter:
+1:
/* Is 'dst' already aligned on an 64-byte boundary? */
- be,pt %xcc, 2f ! BR
+ be,pt %XCC, 2f
/* Compute abs((dst & 0x3f) - 0x40) into %g2. This is the number
* of bytes to copy to make 'dst' 64-byte aligned. We pre-
* subtract this from 'len'.
*/
- sub %g2, 0x40, %g2 ! A0 Group
- sub %g0, %g2, %g2 ! A0 Group
- sub %o2, %g2, %o2 ! A0 Group
+ sub %g2, 0x40, %g2
+ sub %g0, %g2, %g2
+ sub %o2, %g2, %o2
/* Copy %g2 bytes from src to dst, one byte at a time. */
-1: ldub [%o1 + 0x00], %o3 ! MS (Group)
- add %o1, 0x1, %o1 ! A1
- add %o0, 0x1, %o0 ! A0 Group
- subcc %g2, 0x1, %g2 ! A1
+1: ldub [%o1 + 0x00], %o3
+ add %o1, 0x1, %o1
+ add %o0, 0x1, %o0
+ subcc %g2, 0x1, %g2
- bg,pt %icc, 1b ! BR Group
- EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2) ! MS Group
+ bg,pt %XCC, 1b
+ EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2)
-2: VISEntryHalf ! MS+MS
- and %o1, 0x7, %g1 ! A1
- ba,pt %xcc, U3copy_to_user_begin ! BR
- alignaddr %o1, %g0, %o1 ! MS (Break-after)
+2: VISEntryHalf
+ and %o1, 0x7, %g1
+ ba,pt %xcc, 1f
+ alignaddr %o1, %g0, %o1
.align 64
-U3copy_to_user_begin:
-#ifdef __KERNEL__
- .globl U3copy_to_user_nop_1_6
-U3copy_to_user_nop_1_6:
- ldxa [%g0] ASI_DCU_CONTROL_REG, %g3
- sethi %uhi(DCU_PE), %o3
- sllx %o3, 32, %o3
- or %g3, %o3, %o3
- stxa %o3, [%g0] ASI_DCU_CONTROL_REG ! Enable P-cache
- membar #Sync
-#endif
- prefetch [%o1 + 0x000], #one_read ! MS Group1
- prefetch [%o1 + 0x040], #one_read ! MS Group2
- andn %o2, (0x40 - 1), %o4 ! A0
- prefetch [%o1 + 0x080], #one_read ! MS Group3
- cmp %o4, 0x140 ! A0
- prefetch [%o1 + 0x0c0], #one_read ! MS Group4
- ldd [%o1 + 0x000], %f0 ! MS Group5 (%f0 results at G8)
- bge,a,pt %icc, 1f ! BR
-
- prefetch [%o1 + 0x100], #one_read ! MS Group6
-1: ldd [%o1 + 0x008], %f2 ! AX (%f2 results at G9)
- cmp %o4, 0x180 ! A1
- bge,a,pt %icc, 1f ! BR
- prefetch [%o1 + 0x140], #one_read ! MS Group7
-1: ldd [%o1 + 0x010], %f4 ! AX (%f4 results at G10)
- cmp %o4, 0x1c0 ! A1
- bge,a,pt %icc, 1f ! BR
-
- prefetch [%o1 + 0x180], #one_read ! MS Group8
-1: faligndata %f0, %f2, %f16 ! FGA Group9 (%f16 at G12)
- ldd [%o1 + 0x018], %f6 ! AX (%f6 results at G12)
- faligndata %f2, %f4, %f18 ! FGA Group10 (%f18 results at G13)
- ldd [%o1 + 0x020], %f8 ! MS (%f8 results at G13)
- faligndata %f4, %f6, %f20 ! FGA Group12 (1-cycle stall,%f20 at G15)
- ldd [%o1 + 0x028], %f10 ! MS (%f10 results at G15)
- faligndata %f6, %f8, %f22 ! FGA Group13 (%f22 results at G16)
-
- ldd [%o1 + 0x030], %f12 ! MS (%f12 results at G16)
- faligndata %f8, %f10, %f24 ! FGA Group15 (1-cycle stall,%f24 at G18)
- ldd [%o1 + 0x038], %f14 ! MS (%f14 results at G18)
- faligndata %f10, %f12, %f26 ! FGA Group16 (%f26 results at G19)
- ldd [%o1 + 0x040], %f0 ! MS (%f0 results at G19)
-
- /* We only use the first loop if len > (7 * 64). */
- subcc %o4, 0x1c0, %o4 ! A0 Group17
- bg,pt %icc, U3copy_to_user_loop1 ! BR
- add %o1, 0x40, %o1 ! A1
-
- add %o4, 0x140, %o4 ! A0 Group18
- ba,pt %xcc, U3copy_to_user_loop2 ! BR
- srl %o4, 6, %o3 ! A0 Group19
- nop
- nop
- nop
- nop
- nop
-
- nop
- nop
-
- /* This loop performs the copy and queues new prefetches.
- * We drop into the second loop when len <= (5 * 64). Note
- * that this (5 * 64) factor has been subtracted from len
- * already.
- */
-U3copy_to_user_loop1:
- ldd [%o1 + 0x008], %f2 ! MS Group2 (%f2 results at G5)
- faligndata %f12, %f14, %f28 ! FGA (%f28 results at G5)
- ldd [%o1 + 0x010], %f4 ! MS Group3 (%f4 results at G6)
- faligndata %f14, %f0, %f30 ! FGA Group4 (1-cycle stall, %f30 at G7)
- EXBLK1(stda %f16, [%o0] ASI_BLK_AIUS) ! MS
- ldd [%o1 + 0x018], %f6 ! AX (%f6 results at G7)
-
- faligndata %f0, %f2, %f16 ! FGA Group12 (7-cycle stall)
- ldd [%o1 + 0x020], %f8 ! MS (%f8 results at G15)
- faligndata %f2, %f4, %f18 ! FGA Group13 (%f18 results at G16)
- ldd [%o1 + 0x028], %f10 ! MS (%f10 results at G16)
- faligndata %f4, %f6, %f20 ! FGA Group14 (%f20 results at G17)
- ldd [%o1 + 0x030], %f12 ! MS (%f12 results at G17)
- faligndata %f6, %f8, %f22 ! FGA Group15 (%f22 results at G18)
- ldd [%o1 + 0x038], %f14 ! MS (%f14 results at G18)
-
- faligndata %f8, %f10, %f24 ! FGA Group16 (%f24 results at G19)
- ldd [%o1 + 0x040], %f0 ! AX (%f0 results at G19)
- prefetch [%o1 + 0x180], #one_read ! MS
- faligndata %f10, %f12, %f26 ! FGA Group17 (%f26 results at G20)
- subcc %o4, 0x40, %o4 ! A0
- add %o1, 0x40, %o1 ! A1
- bg,pt %xcc, U3copy_to_user_loop1 ! BR
- add %o0, 0x40, %o0 ! A0 Group18
-
-U3copy_to_user_loop2_enter:
- mov 5, %o3 ! A1
-
- /* This loop performs on the copy, no new prefetches are
- * queued. We do things this way so that we do not perform
- * any spurious prefetches past the end of the src buffer.
- */
-U3copy_to_user_loop2:
- ldd [%o1 + 0x008], %f2 ! MS
- faligndata %f12, %f14, %f28 ! FGA Group2
- ldd [%o1 + 0x010], %f4 ! MS
- faligndata %f14, %f0, %f30 ! FGA Group4 (1-cycle stall)
- EXBLK2(stda %f16, [%o0] ASI_BLK_AIUS) ! MS
- ldd [%o1 + 0x018], %f6 ! AX
- faligndata %f0, %f2, %f16 ! FGA Group12 (7-cycle stall)
-
- ldd [%o1 + 0x020], %f8 ! MS
- faligndata %f2, %f4, %f18 ! FGA Group13
- ldd [%o1 + 0x028], %f10 ! MS
- faligndata %f4, %f6, %f20 ! FGA Group14
- ldd [%o1 + 0x030], %f12 ! MS
- faligndata %f6, %f8, %f22 ! FGA Group15
- ldd [%o1 + 0x038], %f14 ! MS
- faligndata %f8, %f10, %f24 ! FGA Group16
-
- ldd [%o1 + 0x040], %f0 ! AX
- faligndata %f10, %f12, %f26 ! FGA Group17
- subcc %o3, 0x01, %o3 ! A0
- add %o1, 0x40, %o1 ! A1
- bg,pt %xcc, U3copy_to_user_loop2 ! BR
- add %o0, 0x40, %o0 ! A0 Group18
+1:
+ membar #StoreLoad | #StoreStore | #LoadStore
+ prefetch [%o1 + 0x000], #one_read
+ prefetch [%o1 + 0x040], #one_read
+ andn %o2, (0x40 - 1), %o4
+ prefetch [%o1 + 0x080], #one_read
+ prefetch [%o1 + 0x0c0], #one_read
+ ldd [%o1 + 0x000], %f0
+ prefetch [%o1 + 0x100], #one_read
+ ldd [%o1 + 0x008], %f2
+ prefetch [%o1 + 0x140], #one_read
+ ldd [%o1 + 0x010], %f4
+ prefetch [%o1 + 0x180], #one_read
+ faligndata %f0, %f2, %f16
+ ldd [%o1 + 0x018], %f6
+ faligndata %f2, %f4, %f18
+ ldd [%o1 + 0x020], %f8
+ faligndata %f4, %f6, %f20
+ ldd [%o1 + 0x028], %f10
+ faligndata %f6, %f8, %f22
+
+ ldd [%o1 + 0x030], %f12
+ faligndata %f8, %f10, %f24
+ ldd [%o1 + 0x038], %f14
+ faligndata %f10, %f12, %f26
+ ldd [%o1 + 0x040], %f0
+
+ sub %o4, 0x80, %o4
+ add %o1, 0x40, %o1
+ ba,pt %xcc, 1f
+ srl %o4, 6, %o3
+
+ .align 64
+1:
+ ldd [%o1 + 0x008], %f2
+ faligndata %f12, %f14, %f28
+ ldd [%o1 + 0x010], %f4
+ faligndata %f14, %f0, %f30
+ EXBLK2(stda %f16, [%o0] ASI_BLK_AIUS)
+ ldd [%o1 + 0x018], %f6
+ faligndata %f0, %f2, %f16
+
+ ldd [%o1 + 0x020], %f8
+ faligndata %f2, %f4, %f18
+ ldd [%o1 + 0x028], %f10
+ faligndata %f4, %f6, %f20
+ ldd [%o1 + 0x030], %f12
+ faligndata %f6, %f8, %f22
+ ldd [%o1 + 0x038], %f14
+ faligndata %f8, %f10, %f24
+
+ ldd [%o1 + 0x040], %f0
+ prefetch [%o1 + 0x180], #one_read
+ faligndata %f10, %f12, %f26
+ subcc %o3, 0x01, %o3
+ add %o1, 0x40, %o1
+ bg,pt %XCC, 1b
+ add %o0, 0x40, %o0
/* Finally we copy the last full 64-byte block. */
-U3copy_to_user_loopfini:
- ldd [%o1 + 0x008], %f2 ! MS
- faligndata %f12, %f14, %f28 ! FGA
- ldd [%o1 + 0x010], %f4 ! MS Group19
- faligndata %f14, %f0, %f30 ! FGA
- EXBLK3(stda %f16, [%o0] ASI_BLK_AIUS) ! MS Group20
- ldd [%o1 + 0x018], %f6 ! AX
- faligndata %f0, %f2, %f16 ! FGA Group11 (7-cycle stall)
- ldd [%o1 + 0x020], %f8 ! MS
- faligndata %f2, %f4, %f18 ! FGA Group12
- ldd [%o1 + 0x028], %f10 ! MS
- faligndata %f4, %f6, %f20 ! FGA Group13
- ldd [%o1 + 0x030], %f12 ! MS
- faligndata %f6, %f8, %f22 ! FGA Group14
- ldd [%o1 + 0x038], %f14 ! MS
- faligndata %f8, %f10, %f24 ! FGA Group15
- cmp %g1, 0 ! A0
- be,pt %icc, 1f ! BR
- add %o0, 0x40, %o0 ! A1
- ldd [%o1 + 0x040], %f0 ! MS
-1: faligndata %f10, %f12, %f26 ! FGA Group16
- faligndata %f12, %f14, %f28 ! FGA Group17
- faligndata %f14, %f0, %f30 ! FGA Group18
- EXBLK4(stda %f16, [%o0] ASI_BLK_AIUS) ! MS
- add %o0, 0x40, %o0 ! A0
- add %o1, 0x40, %o1 ! A1
-#ifdef __KERNEL__
- .globl U3copy_to_user_nop_2_3
-U3copy_to_user_nop_2_3:
- mov PRIMARY_CONTEXT, %o3
- stxa %g0, [%o3] ASI_DMMU ! Flush P-cache
- stxa %g3, [%g0] ASI_DCU_CONTROL_REG ! Disable P-cache
-#endif
- membar #Sync ! MS Group26 (7-cycle stall)
+ ldd [%o1 + 0x008], %f2
+ faligndata %f12, %f14, %f28
+ ldd [%o1 + 0x010], %f4
+ faligndata %f14, %f0, %f30
+ EXBLK3(stda %f16, [%o0] ASI_BLK_AIUS)
+ ldd [%o1 + 0x018], %f6
+ faligndata %f0, %f2, %f16
+ ldd [%o1 + 0x020], %f8
+ faligndata %f2, %f4, %f18
+ ldd [%o1 + 0x028], %f10
+ faligndata %f4, %f6, %f20
+ ldd [%o1 + 0x030], %f12
+ faligndata %f6, %f8, %f22
+ ldd [%o1 + 0x038], %f14
+ faligndata %f8, %f10, %f24
+ cmp %g1, 0
+ be,pt %XCC, 1f
+ add %o0, 0x40, %o0
+ ldd [%o1 + 0x040], %f0
+1: faligndata %f10, %f12, %f26
+ faligndata %f12, %f14, %f28
+ faligndata %f14, %f0, %f30
+ EXBLK4(stda %f16, [%o0] ASI_BLK_AIUS)
+ add %o0, 0x40, %o0
+ add %o1, 0x40, %o1
+
+ membar #Sync
/* Now we copy the (len modulo 64) bytes at the end.
* Note how we borrow the %f0 loaded above.
*
* Also notice how this code is careful not to perform a
- * load past the end of the src buffer just like similar
- * code found in U3copy_to_user_toosmall processing.
+ * load past the end of the src buffer.
*/
-U3copy_to_user_loopend:
- and %o2, 0x3f, %o2 ! A0 Group
- andcc %o2, 0x38, %g2 ! A0 Group
- be,pn %icc, U3copy_to_user_endcruft ! BR
- subcc %g2, 0x8, %g2 ! A1
- be,pn %icc, U3copy_to_user_endcruft ! BR Group
- cmp %g1, 0 ! A0
-
- be,a,pt %icc, 1f ! BR Group
- ldd [%o1 + 0x00], %f0 ! MS
-
-1: ldd [%o1 + 0x08], %f2 ! MS Group
- add %o1, 0x8, %o1 ! A0
- sub %o2, 0x8, %o2 ! A1
- subcc %g2, 0x8, %g2 ! A0 Group
- faligndata %f0, %f2, %f8 ! FGA Group
- EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8) ! MS (XXX does it stall here? XXX)
- be,pn %icc, U3copy_to_user_endcruft ! BR
- add %o0, 0x8, %o0 ! A0
- ldd [%o1 + 0x08], %f0 ! MS Group
- add %o1, 0x8, %o1 ! A0
- sub %o2, 0x8, %o2 ! A1
- subcc %g2, 0x8, %g2 ! A0 Group
- faligndata %f2, %f0, %f8 ! FGA
- EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8) ! MS (XXX does it stall here? XXX)
- bne,pn %icc, 1b ! BR
- add %o0, 0x8, %o0 ! A0 Group
+ and %o2, 0x3f, %o2
+ andcc %o2, 0x38, %g2
+ be,pn %XCC, 2f
+ subcc %g2, 0x8, %g2
+ be,pn %XCC, 2f
+ cmp %g1, 0
+
+ be,a,pt %XCC, 1f
+ ldd [%o1 + 0x00], %f0
+
+1: ldd [%o1 + 0x08], %f2
+ add %o1, 0x8, %o1
+ sub %o2, 0x8, %o2
+ subcc %g2, 0x8, %g2
+ faligndata %f0, %f2, %f8
+ EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8)
+ be,pn %XCC, 2f
+ add %o0, 0x8, %o0
+ ldd [%o1 + 0x08], %f0
+ add %o1, 0x8, %o1
+ sub %o2, 0x8, %o2
+ subcc %g2, 0x8, %g2
+ faligndata %f2, %f0, %f8
+ EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8)
+ bne,pn %XCC, 1b
+ add %o0, 0x8, %o0
/* If anything is left, we copy it one byte at a time.
* Note that %g1 is (src & 0x3) saved above before the
* alignaddr was performed.
*/
-U3copy_to_user_endcruft:
+2:
cmp %o2, 0
add %o1, %g1, %o1
VISExitHalf
- be,pn %icc, U3copy_to_user_short_ret
- nop
- ba,a,pt %xcc, U3copy_to_user_short
-
- /* If we get here, then 32 <= len < (6 * 64) */
-U3copy_to_user_toosmall:
-
-#ifdef SMALL_COPY_USES_FPU
-
- /* Is 'dst' already aligned on an 8-byte boundary? */
- be,pt %xcc, 2f ! BR Group
-
- /* Compute abs((dst & 7) - 8) into %g2. This is the number
- * of bytes to copy to make 'dst' 8-byte aligned. We pre-
- * subtract this from 'len'.
- */
- sub %g2, 0x8, %g2 ! A0
- sub %g0, %g2, %g2 ! A0 Group (reg-dep)
- sub %o2, %g2, %o2 ! A0 Group (reg-dep)
-
- /* Copy %g2 bytes from src to dst, one byte at a time. */
-1: ldub [%o1 + 0x00], %o3 ! MS (Group) (%o3 in 3 cycles)
- add %o1, 0x1, %o1 ! A1
- add %o0, 0x1, %o0 ! A0 Group
- subcc %g2, 0x1, %g2 ! A1
+ be,pn %XCC, 85f
+ sub %o0, %o1, %o3
- bg,pt %icc, 1b ! BR Group
- EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2) ! MS Group
+ andcc %g1, 0x7, %g0
+ bne,pn %icc, 90f
+ andcc %o2, 0x8, %g0
+ be,pt %icc, 1f
+ nop
+ ldx [%o1], %o5
+ EXNV(stxa %o5, [%o1 + %o3] ASI_AIUS, add %o2, %g0)
+ add %o1, 0x8, %o1
-2: VISEntryHalf ! MS+MS
+1: andcc %o2, 0x4, %g0
+ be,pt %icc, 1f
+ nop
+ lduw [%o1], %o5
+ EXNV(stwa %o5, [%o1 + %o3] ASI_AIUS, and %o2, 0x7)
+ add %o1, 0x4, %o1
- /* Compute (len - (len % 8)) into %g2. This is guaranteed
- * to be nonzero.
- */
- andn %o2, 0x7, %g2 ! A0 Group
-
- /* You may read this and believe that it allows reading
- * one 8-byte longword past the end of src. It actually
- * does not, as %g2 is subtracted as loads are done from
- * src, so we always stop before running off the end.
- * Also, we are guaranteed to have at least 0x10 bytes
- * to move here.
- */
- sub %g2, 0x8, %g2 ! A0 Group (reg-dep)
- alignaddr %o1, %g0, %g1 ! MS (Break-after)
- ldd [%g1 + 0x00], %f0 ! MS Group (1-cycle stall)
- add %g1, 0x8, %g1 ! A0
-
-1: ldd [%g1 + 0x00], %f2 ! MS Group
- add %g1, 0x8, %g1 ! A0
- sub %o2, 0x8, %o2 ! A1
- subcc %g2, 0x8, %g2 ! A0 Group
-
- faligndata %f0, %f2, %f8 ! FGA Group (1-cycle stall)
- EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8) ! MS Group (2-cycle stall)
- add %o1, 0x8, %o1 ! A0
- be,pn %icc, 2f ! BR
-
- add %o0, 0x8, %o0 ! A1
- ldd [%g1 + 0x00], %f0 ! MS Group
- add %g1, 0x8, %g1 ! A0
- sub %o2, 0x8, %o2 ! A1
-
- subcc %g2, 0x8, %g2 ! A0 Group
- faligndata %f2, %f0, %f8 ! FGA Group (1-cycle stall)
- EX(stda %f8, [%o0 + 0x00] %asi, add %o2, 0x8) ! MS Group (2-cycle stall)
- add %o1, 0x8, %o1 ! A0
-
- bne,pn %icc, 1b ! BR
- add %o0, 0x8, %o0 ! A1
-
- /* Nothing left to copy? */
-2: cmp %o2, 0 ! A0 Group
- VISExitHalf ! A0+MS
- be,pn %icc, U3copy_to_user_short_ret ! BR Group
- nop ! A0
- ba,a,pt %xcc, U3copy_to_user_short ! BR Group
-
-#else /* !(SMALL_COPY_USES_FPU) */
-
- xor %o1, %o0, %g2
- andcc %g2, 0x7, %g0
- bne,pn %icc, U3copy_to_user_short
- andcc %o1, 0x7, %g2
-
- be,pt %xcc, 2f
- sub %g2, 0x8, %g2
- sub %g0, %g2, %g2
- sub %o2, %g2, %o2
+1: andcc %o2, 0x2, %g0
+ be,pt %icc, 1f
+ nop
+ lduh [%o1], %o5
+ EXNV(stha %o5, [%o1 + %o3] ASI_AIUS, and %o2, 0x3)
+ add %o1, 0x2, %o1
-1: ldub [%o1 + 0x00], %o3
- add %o1, 0x1, %o1
- add %o0, 0x1, %o0
- subcc %g2, 0x1, %g2
- bg,pt %icc, 1b
- EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2)
+1: andcc %o2, 0x1, %g0
+ be,pt %icc, 85f
+ nop
+ ldub [%o1], %o5
+ ba,pt %xcc, 85f
+ EXNV(stba %o5, [%o1 + %o3] ASI_AIUS, and %o2, 0x1)
+
+70: /* 16 < len <= 64 */
+ bne,pn %XCC, 90f
+ sub %o0, %o1, %o3
+
+ andn %o2, 0x7, %o4
+ and %o2, 0x7, %o2
+1: subcc %o4, 0x8, %o4
+ ldx [%o1], %o5
+ EXNV4(stxa %o5, [%o1 + %o3] ASI_AIUS, add %o2, %o4)
+ bgu,pt %XCC, 1b
+ add %o1, 0x8, %o1
+ andcc %o2, 0x4, %g0
+ be,pt %XCC, 1f
+ nop
+ sub %o2, 0x4, %o2
+ lduw [%o1], %o5
+ EXNV3(stwa %o5, [%o1 + %o3] ASI_AIUS, add %o2, %g0)
+ add %o1, 0x4, %o1
+1: cmp %o2, 0
+ be,pt %XCC, 85f
+ nop
+ ba,pt %xcc, 90f
+ nop
-2: andn %o2, 0x7, %g2
- sub %o2, %g2, %o2
+80: /* 0 < len <= 16 */
+ andcc %o3, 0x3, %g0
+ bne,pn %XCC, 90f
+ sub %o0, %o1, %o3
-3: ldx [%o1 + 0x00], %o3
- add %o1, 0x8, %o1
- add %o0, 0x8, %o0
- subcc %g2, 0x8, %g2
- bg,pt %icc, 3b
- EXNV3(stxa %o3, [%o0 + -8] %asi, add %o2, %g2)
+1:
+ subcc %o2, 4, %o2
+ lduw [%o1], %g1
+ EXNV3(stwa %g1, [%o1 + %o3] ASI_AIUS, add %o2, %g0)
+ bgu,pt %XCC, 1b
+ add %o1, 4, %o1
- cmp %o2, 0
- bne,pn %icc, U3copy_to_user_short
- nop
- ba,a,pt %xcc, U3copy_to_user_short_ret
+85: retl
+ clr %o0
-#endif /* !(SMALL_COPY_USES_FPU) */
+ .align 32
+90:
+ subcc %o2, 1, %o2
+ ldub [%o1], %g1
+ EXNV2(stba %g1, [%o1 + %o3] ASI_AIUS, add %o2, %g0)
+ bgu,pt %XCC, 90b
+ add %o1, 1, %o1
+ retl
+ clr %o0
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