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comparison packages/kernel/current/src/debug/dbg-thread-demux.c @ 0:3111d98ba7b3 ecos-v1_1-release

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Initial commit of eCos version 1.1
author jlarmour
date Tue, 11 May 1999 11:16:07 +0000
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children 443894e2e912
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-1:000000000000 0:3111d98ba7b3
1 /*==========================================================================
2 //
3 // dbg-thread-demux.c
4 //
5 // GDB Stub ROM system calls
6 //
7 //==========================================================================
8 //####COPYRIGHTBEGIN####
9 //
10 // -------------------------------------------
11 // The contents of this file are subject to the Cygnus eCos Public License
12 // Version 1.0 (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://sourceware.cygnus.com/ecos
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 Cygnus Operating System, released
22 // September 30, 1998.
23 //
24 // The Initial Developer of the Original Code is Cygnus. Portions created
25 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved.
26 // -------------------------------------------
27 //
28 //####COPYRIGHTEND####
29 //==========================================================================
30 //#####DESCRIPTIONBEGIN####
31 //
32 // Author(s): nickg
33 // Contributors:
34 // Date: 1998-09-03
35 // Purpose: GDB Stub ROM system calls
36 // Description:
37 //
38 //####DESCRIPTIONEND####
39 //
40 //========================================================================*/
41
42
43 /* This file implements system calls out from the ROM debug stub into
44 the operating environment.
45 We assume they exist in the same address space.
46 This file should be linked into your operating environment, your O.S.
47 or whatever is managing multiple saved process contexts.
48 Your O.S. needs to implement and provide
49 dbg_thread_capabilities
50 dbg_currthread
51 dbg_threadlist
52 dbg_threadinfo
53 dbg_getthreadreg
54 dbg_setthreadreg
55
56 The debug stub will call this function by calling it indirectly
57 vis a pre-assigned location possably somthing like a virtual vector table.
58 Where this is exactly is platform specific.
59
60 The O.S. should call patch_dbg_syscalls() and pass the address of the
61 location to be patched with the dbg_thread_syscall_rmt function.
62 Nothing really calls this by name.
63
64 This scheme would also work if we wanted to use a real trapped system call.
65 */
66
67 // -------------------------------------------------------------------------
68
69 #include <pkgconf/kernel.h>
70
71 #include "cyg/hal/dbg-threads-api.h"
72 #include "dbg-thread-syscall.h"
73
74 // -------------------------------------------------------------------------
75
76 static int dbg_thread_syscall_rmt(
77 enum dbg_syscall_ids id,
78 union dbg_thread_syscall_parms * p
79 )
80 {
81 switch (id)
82 {
83 case dbg_null_func : return 1 ; /* test the syscall apparatus */
84
85 #ifdef CYGDBG_KERNEL_DEBUG_GDB_THREAD_SUPPORT
86 case dbg_capabilities_func :
87 return dbg_thread_capabilities(p->cap_parms.abilities) ;
88 break ;
89 case dbg_currthread_func :
90 return dbg_currthread(p->currthread_parms.ref) ;
91 break ;
92 case dbg_threadlist_func :
93 return dbg_threadlist(p->threadlist_parms.startflag,
94 p->threadlist_parms.lastid,
95 p->threadlist_parms.nextthreadid) ;
96 break ;
97 case dbg_threadinfo_func :
98 return dbg_threadinfo(p->info_parms.ref,
99 p->info_parms.info
100 ) ;
101 break ;
102 case dbg_getthreadreg_func :
103 return dbg_getthreadreg(p->reg_parms.thread,
104 p->reg_parms.regcount,
105 p->reg_parms.registers) ;
106 break ;
107 case dbg_setthreadreg_func :
108 return dbg_setthreadreg(p->reg_parms.thread,
109 p->reg_parms.regcount,
110 p->reg_parms.registers) ;
111 break ;
112 #endif /* CYGDBG_KERNEL_DEBUG_GDB_THREAD_SUPPORT */
113 default :
114 return 0 ; /* failure tue to non-implementation */
115 }
116 }
117
118 // -------------------------------------------------------------------------
119 // When Cygmon calls us on the TX39 It has its own value in GP. We need to
120 // save that and set our own before proceeding.
121
122 #ifdef CYG_HAL_TX39
123 static int dbg_thread_syscall_rmt_1(
124 enum dbg_syscall_ids id,
125 union dbg_thread_syscall_parms * p
126 )
127 {
128
129 register long gp_save;
130 int r;
131 asm ( "move %0,$28;"
132 ".extern _gp;"
133 "la $gp,_gp;"
134 : "=r"(gp_save)
135 );
136
137 r = dbg_thread_syscall_rmt( id, p );
138
139 asm ( "move $gp,%0;" :: "r"(gp_save) );
140
141 return r;
142
143 }
144 #endif
145
146 // -------------------------------------------------------------------------
147
148 void patch_dbg_syscalls(void * vector)
149 {
150 dbg_syscall_func * f ;
151 f = vector ;
152 #ifdef CYG_HAL_TX39
153 *f = dbg_thread_syscall_rmt_1 ;
154 #else
155 *f = dbg_thread_syscall_rmt ;
156 #endif
157 }
158
159 // -------------------------------------------------------------------------
160 // End of dbg-thread-demux.c