diff options
Diffstat (limited to 'arch/blackfin/lib/memcpy.S')
| -rw-r--r-- | arch/blackfin/lib/memcpy.S | 60 |
1 files changed, 21 insertions, 39 deletions
diff --git a/arch/blackfin/lib/memcpy.S b/arch/blackfin/lib/memcpy.S index c1e00eff541..53cb3698ab3 100644 --- a/arch/blackfin/lib/memcpy.S +++ b/arch/blackfin/lib/memcpy.S @@ -1,36 +1,13 @@ /* - * File: arch/blackfin/lib/memcpy.S - * Based on: - * Author: + * internal version of memcpy(), issued by the compiler to copy blocks of + * data around. This is really memmove() - it has to be able to deal with + * possible overlaps, because that ambiguity is when the compiler gives up + * and calls a function. We have our own, internal version so that we get + * something we trust, even if the user has redefined the normal symbol. * - * Created: - * Description: internal version of memcpy(), issued by the compiler - * to copy blocks of data around. - * This is really memmove() - it has to be able to deal with - * possible overlaps, because that ambiguity is when the compiler - * gives up and calls a function. We have our own, internal version - * so that we get something we trust, even if the user has redefined - * the normal symbol. + * Copyright 2004-2009 Analog Devices Inc. * - * Modified: - * Copyright 2004-2006 Analog Devices Inc. - * - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see the file COPYING, or write - * to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * Licensed under the Clear BSD license or the GPL-2 (or later) */ #include <linux/linkage.h> @@ -70,8 +47,8 @@ ENTRY(_memcpy) /* Check for aligned data.*/ R3 = R1 | R0; - R0 = 0x3; - R3 = R3 & R0; + R1 = 0x3; + R3 = R3 & R1; CC = R3; /* low bits set on either address? */ IF CC JUMP .Lnot_aligned; @@ -83,7 +60,6 @@ ENTRY(_memcpy) /* less than eight bytes... */ P2 = R2; LSETUP(.Lthree_start, .Lthree_end) LC0=P2; - R0 = R1; /* setup src address for return */ .Lthree_start: R3 = B[P1++] (X); .Lthree_end: @@ -94,13 +70,19 @@ ENTRY(_memcpy) .Lmore_than_seven: /* There's at least eight bytes to copy. */ P2 += -1; /* because we unroll one iteration */ - LSETUP(.Lword_loop, .Lword_loop) LC0=P2; - R0 = R1; + LSETUP(.Lword_loops, .Lword_loope) LC0=P2; I1 = P1; R3 = [I1++]; -.Lword_loop: +#if ANOMALY_05000202 +.Lword_loops: + [P0++] = R3; +.Lword_loope: + R3 = [I1++]; +#else +.Lword_loops: +.Lword_loope: MNOP || [P0++] = R3 || R3 = [I1++]; - +#endif [P0++] = R3; /* Any remaining bytes to copy? */ R3 = 0x3; @@ -113,7 +95,6 @@ ENTRY(_memcpy) .Lnot_aligned: /* From here, we're copying byte-by-byte. */ LSETUP (.Lbyte_start, .Lbyte_end) LC0=P2; - R0 = R1; /* Save src address for return */ .Lbyte_start: R1 = B[P1++] (X); .Lbyte_end: @@ -128,7 +109,6 @@ ENTRY(_memcpy) * Don't bother to work out alignment for * the reverse case. */ - R0 = R1; /* save src for later. */ P0 = P0 + P2; P0 += -1; P1 = P1 + P2; @@ -140,3 +120,5 @@ ENTRY(_memcpy) B[P0--] = R1; RTS; + +ENDPROC(_memcpy) |