X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fsparc64%2Flib%2FU3copy_to_user.S;h=2334f111bb0c81c36f4b1016725a238650e28d97;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=715227156dac0c36d96962d5912b86aa39211393;hpb=9bf4aaab3e101692164d49b7ca357651eb691cb6;p=linux-2.6.git diff --git a/arch/sparc64/lib/U3copy_to_user.S b/arch/sparc64/lib/U3copy_to_user.S index 715227156..2334f111b 100644 --- a/arch/sparc64/lib/U3copy_to_user.S +++ b/arch/sparc64/lib/U3copy_to_user.S @@ -1,415 +1,33 @@ -/* U3copy_to_user.S: UltraSparc-III optimized memcpy. +/* U3copy_to_user.S: UltraSparc-III optimized copy to userspace. * * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com) */ -#include -#include -#include -#include - -#define XCC xcc - -#define EXNV(x,y,a,b) \ -98: x,y; \ - .section .fixup; \ - .align 4; \ -99: retl; \ - a, b, %o0; \ - .section __ex_table; \ - .align 4; \ - .word 98b, 99b; \ - .text; \ - .align 4; -#define EXNV2(x,y,a,b) \ -98: x,y; \ - .section .fixup; \ - .align 4; \ -99: a, b, %o0; \ - retl; \ - add %o0, 1, %o0; \ - .section __ex_table; \ - .align 4; \ - .word 98b, 99b; \ - .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; \ -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; \ - .section __ex_table; \ - .align 4; \ - .word 98b, 99b; \ - .text; \ +#define EX_ST(x) \ +98: x; \ + .section .fixup; \ + .align 4; \ +99: retl; \ + mov 1, %o0; \ + .section __ex_table,"a";\ + .align 4; \ + .word 98b, 99b; \ + .text; \ .align 4; -#define EXBLK1(x,y) \ -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; \ - retl; \ - add %o2, 0x40, %o0; \ - .section __ex_table; \ - .align 4; \ - .word 98b, 99b; \ - .text; \ - .align 4; - - .register %g2,#scratch - .register %g3,#scratch - - /* 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. - */ - - .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. - */ +#define FUNC_NAME U3copy_to_user +#define STORE(type,src,addr) type##a src, [addr] ASI_AIUS +#define STORE_BLK(src,addr) stda src, [addr] ASI_BLK_AIUS +#define EX_RETVAL(x) 0 - .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 - 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 -1: - /* Is 'dst' already aligned on an 64-byte boundary? */ - 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 - 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 - add %o1, 0x1, %o1 - add %o0, 0x1, %o0 - subcc %g2, 0x1, %g2 - - bg,pt %XCC, 1b - EXNV2(stba %o3, [%o0 + -1] %asi, add %o2, %g2) - -2: VISEntryHalf - and %o1, 0x7, %g1 - ba,pt %xcc, 1f - alignaddr %o1, %g0, %o1 - - .align 64 -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. */ - 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. - */ - 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. - */ -2: - cmp %o2, 0 - add %o1, %g1, %o1 - VISExitHalf - be,pn %XCC, 85f - sub %o0, %o1, %o3 - - 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 - -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 - -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: 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 - -80: /* 0 < len <= 16 */ - andcc %o3, 0x3, %g0 - bne,pn %XCC, 90f - sub %o0, %o1, %o3 - -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 - -85: retl - clr %o0 +#define PREAMBLE \ + rd %asi, %g1; \ + cmp %g1, ASI_AIUS; \ + bne,pn %icc, memcpy_user_stub; \ + nop; \ - .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 +#include "U3memcpy.S"