source: trunk/libs/newlib/src/libgloss/msp430/syscalls.S @ 616

Last change on this file since 616 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 2.0 KB
Line 
1/* Copyright (c) 2012, 2013 Red Hat, Inc. All rights reserved.
2
3   This copyrighted material is made available to anyone wishing to use, modify,
4   copy, or redistribute it subject to the terms and conditions of the BSD
5   License.   This program is distributed in the hope that it will be useful,
6   but WITHOUT ANY WARRANTY expressed or implied, including the implied warranties
7   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  A copy of this license
8   is available at http://www.opensource.org/licenses. Any Red Hat trademarks that
9   are incorporated in the source code or documentation are not subject to the BSD
10   License and may only be used or replicated with the express permission of
11   Red Hat, Inc.
12*/
13
14/* Be wary: the lower N bits of the *address* of the function
15   determines the syscall used by the simulator.  Thus, the addresses
16   listed here depend on the syscall numbers in ../syscalls.h.  */
17
18/* As per the MSP430x200 Family Users Guide, section 1.5, "An
19   instruction fetch from the address range 0x0000 - 0x01FF will reset
20   the device."  We take advantage of that to do syscalls in the
21   simulator, by trying to execute specific addresses in that range
22   and letting the simulator catch them while simulating the CALL
23   instruction.  In theory, this is an operation that the physical
24   hardware will never attempt to do, so it won't interfere with the
25   simulation's accuracy (i.e. we aren't abusing holes in the opcode
26   map, for example).  */
27
28#include "../syscall.h"
29#include "memmodel.h"
30       
31.macro  sc,a
32        sc2 \a,\a
33.endm
34       
35.macro  sc2,name,num
36        .weak   \name
37        .global \name
38        \name = 0x180 + \num
39.endm
40
41#define SC(n) sc2 n,SYS_##n
42
43        sc2     _exit,SYS_exit
44        SC (exit)
45        SC (open)
46        SC (close)
47        SC (read)
48/*      SC (write)*/
49        SC (fstat)
50        SC (lseek)
51        SC (kill)
52
53        .weak   isatty
54        .global isatty
55isatty:
56        .weak   _isatty
57        .global _isatty
58_isatty:
59        MOV     #1,R12
60        ret_
61       
62        .weak   getpid
63        .global getpid
64getpid:
65        MOV     #42,R12
66        ret_
67
68        .weak   gettimeofday
69        .global gettimeofday
70gettimeofday:
71        MOV     #0,R12
72        ret_
73        .size gettimeofday , . - gettimeofday
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