Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / blackfin / lib / memset.S

diff --git a/qemu/roms/u-boot/arch/blackfin/lib/memset.S b/qemu/roms/u-boot/arch/blackfin/lib/memset.S
new file mode 100644 (file)
index 0000000..21cbabd
--- /dev/null
+++ b/qemu/roms/u-boot/arch/blackfin/lib/memset.S
@@ -0,0 +1,83 @@
+/*
+ * File: memset.S
+ *
+ * Copyright 2004-2007 Analog Devices Inc.
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+.align 2
+
+/*
+ * C Library function MEMSET
+ * R0 = address (leave unchanged to form result)
+ * R1 = filler byte
+ * R2 = count
+ * Favours word aligned data.
+ */
+
+.globl _memset;
+.type _memset, STT_FUNC;
+_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;
+
+.size _memset, .-_memset