diff options
Diffstat (limited to 'libc/string/bfin/memset.S')
| -rw-r--r-- | libc/string/bfin/memset.S | 88 |
1 files changed, 49 insertions, 39 deletions
diff --git a/libc/string/bfin/memset.S b/libc/string/bfin/memset.S index bd8eb4b6a..c8ee0835f 100644 --- a/libc/string/bfin/memset.S +++ b/libc/string/bfin/memset.S @@ -1,5 +1,5 @@ /* memset.S - * Copyright (C) 2003, 2005, 2006 Analog Devices Inc., All Rights Reserved. + * Copyright (C) 2003-2007 Analog Devices Inc., All Rights Reserved. * * This file is subject to the terms and conditions of the GNU Library General * Public License. See the file "COPYING.LIB" in the main directory of this @@ -9,6 +9,8 @@ * http://www.analog.com/processors/resources/crosscore/visualDspDevSoftware.html */ +#include <sysdep.h> + /* void *memset(void *s, int c, size_t n); * R0 = address (s) (leave unchanged to form result) * R1 = filler byte (c) @@ -21,66 +23,74 @@ .align 2 -.global _memset -.type _memset, STT_FUNC -_memset: - P0 = R0 ; // P0 = address - P2 = R2 ; // P2 = count - R3 = R0 + R2; // end +/* We have to bypass the libc-symbols.h machinery to make sure we get + * a weak symbol for memcpy (some crummy gcc tests want to redefine it). + */ +.global ___GI_memset +.type ___GI_memset, STT_FUNC +___GI_memset: + P0 = R0 ; /* P0 = address */ + P2 = R2 ; /* P2 = count */ + R3 = R0 + R2; /* end */ CC = R2 <= 7(IU); - IF CC JUMP too_small; - R1 = R1.B (Z); // R1 = fill char + IF CC JUMP .Ltoo_small; + R1 = R1.B (Z); /* R1 = fill char */ R2 = 3; - R2 = R0 & R2; // addr bottom two bits - CC = R2 == 0; // AZ set if zero. - IF !CC JUMP force_align ; // Jump if addr not aligned. + R2 = R0 & R2; /* addr bottom two bits */ + CC = R2 == 0; /* AZ set if zero. */ + IF !CC JUMP .Lforce_align ; /* Jump if addr not aligned. */ -aligned: - P1 = P2 >> 2; // count = n/4 - R2 = R1 << 8; // create quad filler +.Laligned: + P1 = P2 >> 2; /* count = n/4 */ + R2 = R1 << 8; /* create quad filler */ R2.L = R2.L + R1.L(NS); R2.H = R2.L + R1.H(NS); P2 = R3; - LSETUP (quad_loop , quad_loop) LC0=P1; -quad_loop: + LSETUP (.Lquad_loop , .Lquad_loop) LC0=P1; +.Lquad_loop: [P0++] = R2; CC = P0 == P2; - IF !CC JUMP bytes_left; + IF !CC JUMP .Lbytes_left; RTS; -bytes_left: - R2 = R3; // end point - R3 = P0; // current position - R2 = R2 - R3; // bytes left +.Lbytes_left: + R2 = R3; /* end point */ + R3 = P0; /* current position */ + R2 = R2 - R3; /* bytes left */ P2 = R2; -too_small: - CC = P2 == 0; //Check zero count - IF CC JUMP finished; // Unusual +.Ltoo_small: + CC = P2 == 0; /* Check zero count */ + IF CC JUMP .Lfinished; /* Unusual */ -bytes: LSETUP (byte_loop , byte_loop) LC0=P2; -byte_loop: B[P0++] = R1; +.Lbytes: + LSETUP (.Lbyte_loop , .Lbyte_loop) LC0=P2; +.Lbyte_loop: + B[P0++] = R1; -finished: +.Lfinished: RTS; -force_align: - CC = BITTST (R0, 0 ); // odd byte +.Lforce_align: + CC = BITTST (R0, 0); /* odd byte */ R0 = 4; R0 = R0 - R2; P1 = R0; - R0 = P0; // Recover return address - IF !CC JUMP skip1; + R0 = P0; /* Recover return address */ + IF !CC JUMP .Lskip1; B[P0++] = R1; -skip1: - CC = R2 <= 2; // 2 bytes - P2 -= P1; // reduce count - IF !CC JUMP aligned; +.Lskip1: + CC = R2 <= 2; /* 2 bytes */ + P2 -= P1; /* reduce count */ + IF !CC JUMP .Laligned; B[P0++] = R1; B[P0++] = R1; - JUMP aligned; -.size _memset,.-_memset + JUMP .Laligned; + +.size ___GI_memset,.-___GI_memset -libc_hidden_def (memset) +.hidden ___GI_memset +.weak _memset +.set _memset,___GI_memset |