1 files changed, 66 insertions, 0 deletions
diff --git a/libgloss/msp430/syscalls.S b/libgloss/msp430/syscalls.S
new file mode 100644
index 000000000..8aa22ae8a
--- /dev/null
+++ b/libgloss/msp430/syscalls.S
@@ -0,0 +1,66 @@
+/* Copyright (c) 2012, 2013 Red Hat, Inc. All rights reserved.
+
+   This copyrighted material is made available to anyone wishing to use, modify,
+   copy, or redistribute it subject to the terms and conditions of the BSD
+   License.   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY expressed or implied, including the implied warranties
+   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  A copy of this license
+   is available at http://www.opensource.org/licenses. Any Red Hat trademarks that
+   are incorporated in the source code or documentation are not subject to the BSD
+   License and may only be used or replicated with the express permission of
+   Red Hat, Inc.
+*/
+
+/* Be wary: the lower N bits of the *address* of the function
+   determines the syscall used by the simulator.  Thus, the addresses
+   listed here depend on the syscall numbers in ../syscalls.h.  */
+
+/* As per the MSP430x200 Family Users Guide, section 1.5, "An
+   instruction fetch from the address range 0x0000 - 0x01FF will reset
+   the device."  We take advantage of that to do syscalls in the
+   simulator, by trying to execute specific addresses in that range
+   and letting the simulator catch them while simulating the CALL
+   instruction.  In theory, this is an operation that the physical
+   hardware will never attempt to do, so it won't interfere with the
+   simulation's accuracy (i.e. we aren't abusing holes in the opcode
+   map, for example).  */
+
+#include "../syscall.h"
+#include "memmodel.h"
+	
+.macro	sc,a
+	sc2 \a,\a
+.endm
+	
+.macro	sc2,name,num
+	.weak	\name
+	.global	\name
+	\name = 0x180 + \num
+.endm
+
+#define SC(n) sc2 n,SYS_##n
+
+	sc2	_exit,SYS_exit
+	SC (exit)
+	SC (open)
+	SC (close)
+	SC (read)
+/*	SC (write)*/
+	SC (fstat)
+	SC (lseek)
+	SC (kill)
+
+	.weak	isatty
+	.global	isatty
+isatty:
+	.weak	_isatty
+	.global	_isatty
+_isatty:
+	MOV	#1,R12
+	ret_
+	
+	.weak	getpid
+	.global	getpid
+getpid:
+	MOV	#42,R12
+	ret_