sim: bfin: new port

This can boot Das U-Boot and a Linux kernel.  It also supports Linux
userspace FLAT and FDPIC (dynamic and static) ELFs.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 85 insertions, 0 deletions

diff --git a/sim/bfin/linux-fixed-code.s b/sim/bfin/linux-fixed-code.s
new file mode 100644
index 0000000..c1dd358
--- /dev/null
+++ b/sim/bfin/linux-fixed-code.s
@@ -0,0 +1,85 @@
+/* Linux fixed code userspace ABI
+
+   Copyright (C) 2005-2011 Free Software Foundation, Inc.
+   Contributed by Analog Devices, Inc.
+
+   This file is part of simulators.
+
+   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 <http://www.gnu.org/licenses/>.  */
+
+/* For more info, see this page:
+   http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:fixed-code  */
+
+.text
+
+.align 16
+_sigreturn_stub:
+	P0 = 173;
+	EXCPT 0;
+0:	JUMP.S 0b;
+
+.align 16
+_atomic_xchg32:
+	R0 = [P0];
+	[P0] = R1;
+	rts;
+
+.align 16
+_atomic_cas32:
+	R0 = [P0];
+	CC = R0 == R1;
+	IF !CC JUMP 1f;
+	[P0] = R2;
+1:
+	rts;
+
+.align 16
+_atomic_add32:
+	R1 = [P0];
+	R0 = R1 + R0;
+	[P0] = R0;
+	rts;
+
+.align 16
+_atomic_sub32:
+	R1 = [P0];
+	R0 = R1 - R0;
+	[P0] = R0;
+	rts;
+
+.align 16
+_atomic_ior32:
+	R1 = [P0];
+	R0 = R1 | R0;
+	[P0] = R0;
+	rts;
+
+.align 16
+_atomic_and32:
+	R1 = [P0];
+	R0 = R1 & R0;
+	[P0] = R0;
+	rts;
+
+.align 16
+_atomic_xor32:
+	R1 = [P0];
+	R0 = R1 ^ R0;
+	[P0] = R0;
+	rts;
+
+.align 16
+_safe_user_instruction:
+	NOP; NOP; NOP; NOP;
+	EXCPT 0x4;