-/* $Id: U3copy_in_user.S,v 1.4 2001/03/21 05:58:47 davem Exp $
- * U3memcpy.S: UltraSparc-III optimized copy within userspace.
+/* U3copy_in_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>
-#undef SMALL_COPY_USES_FPU
+#include <asm/dcu.h>
+#include <asm/spitfire.h>
+
+#define XCC xcc
+
#define EXNV(x,y,a,b) \
98: x,y; \
.section .fixup; \
.word 98b, 99b; \
.text; \
.align 4;
-#define EXNV2(x,y,a,b) \
+#define EXNV1(x,y,a,b) \
98: x,y; \
.section .fixup; \
.align 4; \
.word 98b, 99b; \
.text; \
.align 4;
-#define EXNV3(x,y,a,b) \
+#define EXNV4(x,y,a,b) \
98: x,y; \
.section .fixup; \
.align 4; \
99: a, b, %o0; \
retl; \
- add %o0, 8, %o0; \
- .section __ex_table; \
- .align 4; \
- .word 98b, 99b; \
- .text; \
- .align 4;
-#define EX(x,y,a,b) \
-98: x,y; \
- .section .fixup; \
- .align 4; \
-99: VISExitHalf; \
- retl; \
- a, b, %o0; \
+ add %o0, 4, %o0; \
.section __ex_table; \
.align 4; \
.word 98b, 99b; \
.text; \
.align 4;
-#define EXBLK1(x,y) \
+#define EXNV8(x,y,a,b) \
98: x,y; \
.section .fixup; \
.align 4; \
-99: VISExitHalf; \
- add %o4, 0x1c0, %o1; \
- and %o2, (0x40 - 1), %o2; \
- retl; \
- add %o1, %o2, %o0; \
- .section __ex_table; \
- .align 4; \
- .word 98b, 99b; \
- .text; \
- .align 4;
-#define EXBLK2(x,y) \
-98: x,y; \
- .section .fixup; \
- .align 4; \
-99: VISExitHalf; \
- sll %o3, 6, %o3; \
- and %o2, (0x40 - 1), %o2; \
- add %o3, 0x80, %o1; \
- retl; \
- add %o1, %o2, %o0; \
- .section __ex_table; \
- .align 4; \
- .word 98b, 99b; \
- .text; \
- .align 4;
-#define EXBLK3(x,y) \
-98: x,y; \
- .section .fixup; \
- .align 4; \
-99: VISExitHalf; \
- and %o2, (0x40 - 1), %o2; \
- retl; \
- add %o2, 0x80, %o0; \
- .section __ex_table; \
- .align 4; \
- .word 98b, 99b; \
- .text; \
- .align 4;
-#define EXBLK4(x,y) \
-98: x,y; \
- .section .fixup; \
- .align 4; \
-99: VISExitHalf; \
- and %o2, (0x40 - 1), %o2; \
+99: a, b, %o0; \
retl; \
- add %o2, 0x40, %o0; \
+ add %o0, 8, %o0; \
.section __ex_table; \
.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
- /* Special/non-trivial issues of this code:
- *
- * 1) %o5 is preserved from VISEntryHalf to VISExitHalf
- * 2) Only low 32 FPU registers are used so that only the
- * lower half of the FPU register set is dirtied by this
- * code. This is especially important in the kernel.
- * 3) This code never prefetches cachelines past the end
- * of the source buffer.
- *
- * XXX Actually, Cheetah can buffer up to 8 concurrent
- * XXX prefetches, revisit this...
- */
+ .register %g2,#scratch
+ .register %g3,#scratch
.text
.align 32
- /* The cheetah's flexible spine, oversized liver, enlarged heart,
- * slender muscular body, and claws make it the swiftest hunter
- * in Africa and the fastest animal on land. Can reach speeds
- * of up to 2.4GB per second.
+ /* Don't try to get too fancy here, just nice and
+ * simple. This is predominantly used for well aligned
+ * small copies in the compat layer. It is also used
+ * to copy register windows around during thread cloning.
*/
- .globl U3copy_in_user
-U3copy_in_user: /* %o0=dst, %o1=src, %o2=len */
+ .globl U3copy_in_user
+U3copy_in_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_in_user_short_ret ! BR
-
- /* Extremely small copy? */
- cmp %o2, 31 ! A0 Group
- ble,pn %icc, U3copy_in_user_short ! BR
-
- /* Large enough to use unrolled prefetch loops? */
- cmp %o2, 0x100 ! A1
- bge,a,pt %icc, U3copy_in_user_enter ! BR Group
- andcc %o0, 0x3f, %g2 ! A0
-
- ba,pt %xcc, U3copy_in_user_toosmall ! BR Group
- andcc %o0, 0x7, %g2 ! A0
-
- .align 32
-U3copy_in_user_short:
- /* Copy %o2 bytes from src to dst, one byte at a time. */
- EXNV(lduba [%o1 + 0x00] %asi, %o3, add %o2, %g0)! MS Group
- add %o1, 0x1, %o1 ! A0
- add %o0, 0x1, %o0 ! A1
- subcc %o2, 1, %o2 ! A0 Group
-
- bg,pt %icc, U3copy_in_user_short ! BR
- EXNV(stba %o3, [%o0 + -1] %asi, add %o2, 1) ! MS Group (1-cycle stall)
-
-U3copy_in_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
- * of "andcc %o0, 0x7, %g2", done by caller.
- */
- .align 64
-U3copy_in_user_enter:
- /* Is 'dst' already aligned on an 64-byte boundary? */
- be,pt %xcc, 2f ! BR
-
- /* 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
-
- /* Copy %g2 bytes from src to dst, one byte at a time. */
-1: EXNV(lduba [%o1 + 0x00] %asi, %o3, add %o2, %g2)! MS (Group)
- add %o1, 0x1, %o1 ! A1
- add %o0, 0x1, %o0 ! A0 Group
- subcc %g2, 0x1, %g2 ! A1
-
- bg,pt %icc, 1b ! BR Group
- EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2) ! MS Group
-
-2: VISEntryHalf ! MS+MS
- and %o1, 0x7, %g1 ! A1
- ba,pt %xcc, U3copy_in_user_begin ! BR
- alignaddr %o1, %g0, %o1 ! MS (Break-after)
-
- .align 64
-U3copy_in_user_begin:
- prefetcha [%o1 + 0x000] %asi, #one_read ! MS Group1
- prefetcha [%o1 + 0x040] %asi, #one_read ! MS Group2
- andn %o2, (0x40 - 1), %o4 ! A0
- prefetcha [%o1 + 0x080] %asi, #one_read ! MS Group3
- cmp %o4, 0x140 ! A0
- prefetcha [%o1 + 0x0c0] %asi, #one_read ! MS Group4
- EX(ldda [%o1 + 0x000] %asi, %f0, add %o2, %g0) ! MS Group5 (%f0 results at G8)
- bge,a,pt %icc, 1f ! BR
-
- prefetcha [%o1 + 0x100] %asi, #one_read ! MS Group6
-1: EX(ldda [%o1 + 0x008] %asi, %f2, add %o2, %g0) ! AX (%f2 results at G9)
- cmp %o4, 0x180 ! A1
- bge,a,pt %icc, 1f ! BR
- prefetcha [%o1 + 0x140] %asi, #one_read ! MS Group7
-1: EX(ldda [%o1 + 0x010] %asi, %f4, add %o2, %g0) ! AX (%f4 results at G10)
- cmp %o4, 0x1c0 ! A1
- bge,a,pt %icc, 1f ! BR
-
- prefetcha [%o1 + 0x180] %asi, #one_read ! MS Group8
-1: faligndata %f0, %f2, %f16 ! FGA Group9 (%f16 at G12)
- EX(ldda [%o1 + 0x018] %asi, %f6, add %o2, %g0) ! AX (%f6 results at G12)
- faligndata %f2, %f4, %f18 ! FGA Group10 (%f18 results at G13)
- EX(ldda [%o1 + 0x020] %asi, %f8, add %o2, %g0) ! MS (%f8 results at G13)
- faligndata %f4, %f6, %f20 ! FGA Group12 (1-cycle stall,%f20 at G15)
- EX(ldda [%o1 + 0x028] %asi, %f10, add %o2, %g0) ! MS (%f10 results at G15)
- faligndata %f6, %f8, %f22 ! FGA Group13 (%f22 results at G16)
-
- EX(ldda [%o1 + 0x030] %asi, %f12, add %o2, %g0) ! MS (%f12 results at G16)
- faligndata %f8, %f10, %f24 ! FGA Group15 (1-cycle stall,%f24 at G18)
- EX(ldda [%o1 + 0x038] %asi, %f14, add %o2, %g0) ! MS (%f14 results at G18)
- faligndata %f10, %f12, %f26 ! FGA Group16 (%f26 results at G19)
- EX(ldda [%o1 + 0x040] %asi, %f0, add %o2, %g0) ! 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_in_user_loop1 ! BR
- add %o1, 0x40, %o1 ! A1
-
- add %o4, 0x140, %o4 ! A0 Group18
- ba,pt %xcc, U3copy_in_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_in_user_loop1:
- EXBLK1(ldda [%o1 + 0x008] %asi, %f2) ! MS Group2 (%f2 results at G5)
- faligndata %f12, %f14, %f28 ! FGA (%f28 results at G5)
- EXBLK1(ldda [%o1 + 0x010] %asi, %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
- EXBLK1(ldda [%o1 + 0x018] %asi, %f6) ! AX (%f6 results at G7)
-
- faligndata %f0, %f2, %f16 ! FGA Group12 (7-cycle stall)
- EXBLK1(ldda [%o1 + 0x020] %asi, %f8) ! MS (%f8 results at G15)
- faligndata %f2, %f4, %f18 ! FGA Group13 (%f18 results at G16)
- EXBLK1(ldda [%o1 + 0x028] %asi, %f10) ! MS (%f10 results at G16)
- faligndata %f4, %f6, %f20 ! FGA Group14 (%f20 results at G17)
- EXBLK1(ldda [%o1 + 0x030] %asi, %f12) ! MS (%f12 results at G17)
- faligndata %f6, %f8, %f22 ! FGA Group15 (%f22 results at G18)
- EXBLK1(ldda [%o1 + 0x038] %asi, %f14) ! MS (%f14 results at G18)
-
- faligndata %f8, %f10, %f24 ! FGA Group16 (%f24 results at G19)
- EXBLK1(ldda [%o1 + 0x040] %asi, %f0) ! AX (%f0 results at G19)
- prefetcha [%o1 + 0x180] %asi, #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_in_user_loop1 ! BR
- add %o0, 0x40, %o0 ! A0 Group18
-
-U3copy_in_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_in_user_loop2:
- EXBLK2(ldda [%o1 + 0x008] %asi, %f2) ! MS
- faligndata %f12, %f14, %f28 ! FGA Group2
- EXBLK2(ldda [%o1 + 0x010] %asi, %f4) ! MS
- faligndata %f14, %f0, %f30 ! FGA Group4 (1-cycle stall)
- EXBLK2(stda %f16, [%o0] ASI_BLK_AIUS) ! MS
- EXBLK2(ldda [%o1 + 0x018] %asi, %f6) ! AX
- faligndata %f0, %f2, %f16 ! FGA Group12 (7-cycle stall)
-
- EXBLK2(ldda [%o1 + 0x020] %asi, %f8) ! MS
- faligndata %f2, %f4, %f18 ! FGA Group13
- EXBLK2(ldda [%o1 + 0x028] %asi, %f10) ! MS
- faligndata %f4, %f6, %f20 ! FGA Group14
- EXBLK2(ldda [%o1 + 0x030] %asi, %f12) ! MS
- faligndata %f6, %f8, %f22 ! FGA Group15
- EXBLK2(ldda [%o1 + 0x038] %asi, %f14) ! MS
- faligndata %f8, %f10, %f24 ! FGA Group16
-
- EXBLK2(ldda [%o1 + 0x040] %asi, %f0) ! AX
- faligndata %f10, %f12, %f26 ! FGA Group17
- subcc %o3, 0x01, %o3 ! A0
- add %o1, 0x40, %o1 ! A1
- bg,pt %xcc, U3copy_in_user_loop2 ! BR
- add %o0, 0x40, %o0 ! A0 Group18
-
- /* Finally we copy the last full 64-byte block. */
-U3copy_in_user_loopfini:
- EXBLK3(ldda [%o1 + 0x008] %asi, %f2) ! MS
- faligndata %f12, %f14, %f28 ! FGA
- EXBLK3(ldda [%o1 + 0x010] %asi, %f4) ! MS Group19
- faligndata %f14, %f0, %f30 ! FGA
- EXBLK3(stda %f16, [%o0] ASI_BLK_AIUS) ! MS Group20
- EXBLK4(ldda [%o1 + 0x018] %asi, %f6) ! AX
- faligndata %f0, %f2, %f16 ! FGA Group11 (7-cycle stall)
- EXBLK4(ldda [%o1 + 0x020] %asi, %f8) ! MS
- faligndata %f2, %f4, %f18 ! FGA Group12
- EXBLK4(ldda [%o1 + 0x028] %asi, %f10) ! MS
- faligndata %f4, %f6, %f20 ! FGA Group13
- EXBLK4(ldda [%o1 + 0x030] %asi, %f12) ! MS
- faligndata %f6, %f8, %f22 ! FGA Group14
- EXBLK4(ldda [%o1 + 0x038] %asi, %f14) ! MS
- faligndata %f8, %f10, %f24 ! FGA Group15
- cmp %g1, 0 ! A0
- be,pt %icc, 1f ! BR
- add %o0, 0x40, %o0 ! A1
- EXBLK4(ldda [%o1 + 0x040] %asi, %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
- membar #Sync ! MS Group26 (7-cycle stall)
-
- /* 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_in_user_toosmall processing.
- */
-U3copy_in_user_loopend:
- and %o2, 0x3f, %o2 ! A0 Group
- andcc %o2, 0x38, %g2 ! A0 Group
- be,pn %icc, U3copy_in_user_endcruft ! BR
- subcc %g2, 0x8, %g2 ! A1
- be,pn %icc, U3copy_in_user_endcruft ! BR Group
- cmp %g1, 0 ! A0
-
- be,a,pt %icc, 1f ! BR Group
- EX(ldda [%o1 + 0x00] %asi, %f0, add %o2, %g0) ! MS
-
-1: EX(ldda [%o1 + 0x08] %asi, %f2, add %o2, %g0) ! 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_in_user_endcruft ! BR
- add %o0, 0x8, %o0 ! A0
- EX(ldda [%o1 + 0x08] %asi, %f0, add %o2, %g0) ! 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
+ rd %asi, %g1
+ cmp %g1, ASI_AIUS
+ bne,pn %icc, U3memcpy_user_stub
+ nop
- /* 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_in_user_endcruft:
cmp %o2, 0
- add %o1, %g1, %o1
- VISExitHalf
- be,pn %icc, U3copy_in_user_short_ret
+ be,pn %XCC, out
+ or %o0, %o1, %o3
+ cmp %o2, 16
+ bleu,a,pn %XCC, small_copy
+ or %o3, %o2, %o3
+
+medium_copy: /* 16 < len <= 64 */
+ andcc %o3, 0x7, %g0
+ bne,pn %XCC, small_copy_unaligned
+ sub %o0, %o1, %o3
+
+medium_copy_aligned:
+ andn %o2, 0x7, %o4
+ and %o2, 0x7, %o2
+1: subcc %o4, 0x8, %o4
+ EXNV8(ldxa [%o1] %asi, %o5, add %o4, %o2)
+ EXNV8(stxa %o5, [%o1 + %o3] ASI_AIUS, add %o4, %o2)
+ bgu,pt %XCC, 1b
+ add %o1, 0x8, %o1
+ andcc %o2, 0x4, %g0
+ be,pt %XCC, 1f
+ nop
+ sub %o2, 0x4, %o2
+ EXNV4(lduwa [%o1] %asi, %o5, add %o4, %o2)
+ EXNV4(stwa %o5, [%o1 + %o3] ASI_AIUS, add %o4, %o2)
+ add %o1, 0x4, %o1
+1: cmp %o2, 0
+ be,pt %XCC, out
+ nop
+ ba,pt %xcc, small_copy_unaligned
nop
- ba,a,pt %xcc, U3copy_in_user_short
-
- /* If we get here, then 32 <= len < (6 * 64) */
-U3copy_in_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: EXNV2(lduba [%o1 + 0x00] %asi, %o3, add %o2, %g2)! MS (Group) (%o3 in 3 cycles)
- add %o1, 0x1, %o1 ! A1
- add %o0, 0x1, %o0 ! A0 Group
- subcc %g2, 0x1, %g2 ! A1
-
- bg,pt %icc, 1b ! BR Group
- EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2) ! MS Group
-
-2: VISEntryHalf ! MS+MS
-
- /* 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)
- EX(ldda [%g1 + 0x00] %asi, %f0, add %o2, %g0) ! MS Group (1-cycle stall)
- add %g1, 0x8, %g1 ! A0
-
-1: EX(ldda [%g1 + 0x00] %asi, %f2, add %o2, %g0) ! 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
- EX(ldda [%g1 + 0x00] %asi, %f0, add %o2, %g0) ! 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_in_user_short_ret ! BR Group
- nop ! A0
- ba,a,pt %xcc, U3copy_in_user_short ! BR Group
-
-#else /* !(SMALL_COPY_USES_FPU) */
-
- xor %o1, %o0, %g2
- andcc %g2, 0x7, %g0
- bne,pn %icc, U3copy_in_user_short
- andcc %o1, 0x7, %g2
-
- be,pt %xcc, 2f
- sub %g2, 0x8, %g2
- sub %g0, %g2, %g2
- sub %o2, %g2, %o2
-
-1: EXNV2(lduba [%o1 + 0x00] %asi, %o3, add %o2, %g2)
- 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)
-2: andn %o2, 0x7, %g2
- sub %o2, %g2, %o2
+small_copy: /* 0 < len <= 16 */
+ andcc %o3, 0x3, %g0
+ bne,pn %XCC, small_copy_unaligned
+ sub %o0, %o1, %o3
-3: EXNV3(ldxa [%o1 + 0x00] %asi, %o3, add %o2, %g2)
- 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)
+small_copy_aligned:
+ subcc %o2, 4, %o2
+ EXNV4(lduwa [%o1] %asi, %g1, add %o2, %g0)
+ EXNV4(stwa %g1, [%o1 + %o3] ASI_AIUS, add %o2, %g0)
+ bgu,pt %XCC, small_copy_aligned
+ add %o1, 4, %o1
- cmp %o2, 0
- bne,pn %icc, U3copy_in_user_short
- nop
- ba,a,pt %xcc, U3copy_in_user_short_ret
+out: retl
+ clr %o0
-#endif /* !(SMALL_COPY_USES_FPU) */
+ .align 32
+small_copy_unaligned:
+ subcc %o2, 1, %o2
+ EXNV1(lduba [%o1] %asi, %g1, add %o2, %g0)
+ EXNV1(stba %g1, [%o1 + %o3] ASI_AIUS, add %o2, %g0)
+ bgu,pt %XCC, small_copy_unaligned
+ add %o1, 1, %o1
+ retl
+ clr %o0
git://git.onelab.eu / linux-2.6.git / blobdiff