X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fsparc64%2Flib%2FU3copy_in_user.S;h=af3961fb05a7b8491b9c7e0a502a30faac793b13;hb=9bf4aaab3e101692164d49b7ca357651eb691cb6;hp=674e232b0a6b39931e644f71dd050f77caaa710f;hpb=db216c3d5e4c040e557a50f8f5d35d5c415e8c1c;p=linux-2.6.git diff --git a/arch/sparc64/lib/U3copy_in_user.S b/arch/sparc64/lib/U3copy_in_user.S index 674e232b0..af3961fb0 100644 --- a/arch/sparc64/lib/U3copy_in_user.S +++ b/arch/sparc64/lib/U3copy_in_user.S @@ -1,13 +1,15 @@ -/* $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 #include -#undef SMALL_COPY_USES_FPU +#include +#include + +#define XCC xcc + #define EXNV(x,y,a,b) \ 98: x,y; \ .section .fixup; \ @@ -19,7 +21,7 @@ .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; \ @@ -31,501 +33,108 @@ .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