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comparison packages/hal/mips/arch/current/src/hal_syscall.c @ 156:b939e9cada46

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Merge from eCos master repository on 2001-03-29-21:44:39-BST
author jlarmour
date Fri, 06 Apr 2001 17:20:13 +0000
parents
children e0c0827131d1
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155:70a4cc6d69d2 156:b939e9cada46
1 //=============================================================================
2 //
3 // hal_syscall.c
4 //
5 //
6 //
7 //=============================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Red Hat eCos Public License
12 // Version 1.1 (the "License"); you may not use this file except in
13 // compliance with the License. You may obtain a copy of the License at
14 // http://www.redhat.com/
15 //
16 // Software distributed under the License is distributed on an "AS IS"
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
18 // License for the specific language governing rights and limitations under
19 // the License.
20 //
21 // The Original Code is eCos - Embedded Configurable Operating System,
22 // released September 30, 1998.
23 //
24 // The Initial Developer of the Original Code is Red Hat.
25 // Portions created by Red Hat are
26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
27 // All Rights Reserved.
28 // -------------------------------------------
29 //
30 //####COPYRIGHTEND####
31 //=============================================================================
32 //#####DESCRIPTIONBEGIN####
33 //
34 // Author(s): msalter
35 // Contributors:msalter
36 // Date: 2000-11-5
37 // Purpose:
38 // Description:
39 //
40 //
41 //
42 //####DESCRIPTIONEND####
43 //
44 //=============================================================================
45
46 #include <pkgconf/hal.h>
47
48 #ifdef CYGPKG_REDBOOT
49 #include <pkgconf/redboot.h>
50 #endif
51
52 #if defined(CYGSEM_REDBOOT_BSP_SYSCALLS)
53
54 #include <cyg/hal/hal_stub.h> // Our header
55 #include <cyg/hal/hal_arch.h> // HAL_BREAKINST
56 #include <cyg/hal/hal_cache.h> // HAL_xCACHE_x
57 #include <cyg/hal/hal_intr.h> // interrupt disable/restore
58
59 #include <cyg/hal/hal_if.h> // ROM calling interface
60 #include <cyg/hal/hal_misc.h> // Helper functions
61
62 extern CYG_ADDRWORD __do_syscall(CYG_ADDRWORD func, // syscall function number
63 CYG_ADDRWORD arg1, CYG_ADDRWORD arg2, // up to four args.
64 CYG_ADDRWORD arg3, CYG_ADDRWORD arg4,
65 CYG_ADDRWORD *retval); // syscall return value
66
67 #define SYS_exit 1
68 #define SYS_interrupt 1000
69
70 int
71 hal_syscall_handler(void)
72 {
73 CYG_ADDRWORD func, arg1, arg2, arg3, arg4;
74 CYG_ADDRWORD err;
75
76 func = get_register(REG_A0);
77 arg1 = get_register(REG_A1);
78 arg2 = get_register(REG_A2);
79 arg3 = get_register(REG_A3);
80 arg4 = 0;
81
82 put_register(REG_PC, get_register(REG_PC)+4);
83
84 if (func == SYS_exit) {
85 // We want to stop in exit so that the user may poke around
86 // to see why his app exited.
87 return SIGTRAP;
88 }
89
90 if (func == SYS_interrupt) {
91 // A console interrupt landed us here.
92 // Invoke the debug agent so as to cause a SIGINT.
93 return SIGINT;
94 }
95
96 if (__do_syscall(func, arg1, arg2, arg3, arg4, &err)) {
97 put_register(REG_V0, err);
98 return 0;
99 }
100
101 return SIGTRAP;
102 }
103
104 #endif // CYGSEM_REDBOOT_BSP_SYSCALLS