1 files changed, 93 insertions, 0 deletions
diff --git a/lib_blackfin/memset.S b/lib_blackfin/memset.S
new file mode 100644
index 0000000..c33c551
--- /dev/null
+++ b/lib_blackfin/memset.S
@@ -0,0 +1,93 @@
+/*
+ * File: memset.S
+ *
+ * Copyright 2004-2007 Analog Devices Inc.
+ * 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
+ */
+
+.align 2
+
+/*
+ * C Library function MEMSET
+ * R0 = address (leave unchanged to form result)
+ * R1 = filler byte
+ * R2 = count
+ * Favours word aligned data.
+ */
+
+.globl _memset;
+_memset:
+	P0 = R0 ;              /* P0 = address */
+	P2 = R2 ;              /* P2 = count   */
+	R3 = R0 + R2;          /* end          */
+	CC = R2 <= 7(IU);
+	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  .Lforce_align ;  /* Jump if addr not aligned. */
+
+.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 (.Lquad_loop , .Lquad_loop) LC0=P1;
+.Lquad_loop:
+	[P0++] = R2;
+
+	CC = P0 == P2;
+	IF !CC JUMP .Lbytes_left;
+	RTS;
+
+.Lbytes_left:
+	R2 = R3;                /* end point */
+	R3 = P0;                /* current position */
+	R2 = R2 - R3;           /* bytes left */
+	P2 = R2;
+
+.Ltoo_small:
+	CC = P2 == 0;           /* Check zero count */
+	IF CC JUMP .Lfinished;    /* Unusual */
+
+.Lbytes:
+	LSETUP (.Lbyte_loop , .Lbyte_loop) LC0=P2;
+.Lbyte_loop:
+	B[P0++] = R1;
+
+.Lfinished:
+	RTS;
+
+.Lforce_align:
+	CC = BITTST (R0, 0);  /* odd byte */
+	R0 = 4;
+	R0 = R0 - R2;
+	P1 = R0;
+	R0 = P0;		    /* Recover return address */
+	IF !CC JUMP .Lskip1;
+	B[P0++] = R1;
+.Lskip1:
+	CC = R2 <= 2;          /* 2 bytes */
+	P2 -= P1;              /* reduce count */
+	IF !CC JUMP .Laligned;
+	B[P0++] = R1;
+	B[P0++] = R1;
+	JUMP .Laligned;