source: rtems/cpukit/score/include/rtems/score/context.h @ 48816d7

4.104.114.95
Last change on this file since 48816d7 was 48816d7, checked in by Joel Sherrill <joel.sherrill@…>, on Nov 2, 2007 at 1:35:02 PM

2007-11-02 Joel Sherrill <joel.sherrill@…>

  • score/cpu/sparc/cpu.c, score/cpu/sparc/rtems/score/cpu.h, score/include/rtems/score/context.h, score/src/threadhandler.c: Fix stack so gdb backtrace does not print corrupted frame message after _Thread_Handler. Daniel Hellstrom <daniel@…> provided the SPARC implementation and I made it more general.
  • Property mode set to 100644
File size: 4.8 KB
Line 
1/**
2 *  @file  rtems/score/context.h
3 *
4 *  This include file contains all information about each thread's context.
5 */
6
7/*
8 *  COPYRIGHT (c) 1989-2006.
9 *  On-Line Applications Research Corporation (OAR).
10 *
11 *  The license and distribution terms for this file may be
12 *  found in the file LICENSE in this distribution or at
13 *  http://www.rtems.com/license/LICENSE.
14 *
15 *  $Id$
16 */
17
18#ifndef _RTEMS_SCORE_CONTEXT_H
19#define _RTEMS_SCORE_CONTEXT_H
20
21/**
22 *  @defgroup ScoreContext Context Handler
23 *
24 *  This handler encapsulates functionality which abstracts thread context
25 *  management in a portable manner.
26 */
27/**@{*/
28
29#ifdef __cplusplus
30extern "C" {
31#endif
32
33#include <rtems/score/cpu.h>
34
35/**
36 *  @brief Size of Floating Point Context Area
37 *
38 *  This constant defines the number of bytes required
39 *  to store a full floating point context.
40 */
41#define CONTEXT_FP_SIZE CPU_CONTEXT_FP_SIZE
42
43/**
44 *  @brief Is Context Switch Needed?
45 *
46 *  This variable is set to TRUE when a reschedule operation
47 *  has determined that the processor should be taken away from the
48 *  currently executing thread and given to the heir thread.
49 */
50
51SCORE_EXTERN volatile boolean _Context_Switch_necessary;
52
53/**
54 *  @brief Initialize Context Area
55 *  This routine initializes @a _the_context such that the stack
56 *  pointer, interrupt level, and entry point are correct for the
57 *  thread's initial state.
58 *
59 *  @param[in] _the_context will be initialized
60 *  @param[in] _stack is the lowest physical address of the thread's
61 *         context
62 *  @param[in] _size is the size in octets of the thread's context
63 *  @param[in] _isr is the ISR enable level for this thread
64 *  @param[in] _entry is this thread's entry point
65 *  @param[in] _is_fp is set to TRUE if this thread has floating point
66 *         enabled
67 */
68#define _Context_Initialize(_the_context, _stack, _size, _isr, _entry, _is_fp) \
69   _CPU_Context_Initialize( _the_context, _stack, _size, _isr, _entry, _is_fp )
70
71/**
72 *  This macro is invoked from _Thread_Handler to do whatever CPU
73 *  specific magic is required that must be done in the context of
74 *  the thread when it starts.
75 *
76 *  If the CPU architecture does not require any magic, then this
77 *  macro is empty.
78 */
79
80#if defined(_CPU_Context_Initialization_at_thread_begin)
81  #define _Context_Initialization_at_thread_begin() \
82     _CPU_Context_Initialization_at_thread_begin()
83#else
84  #define _Context_Initialization_at_thread_begin()
85#endif
86
87/**
88 *  @brief Perform Context Switch
89 *
90 *  This routine saves the current context into the @a _executing
91 *  context record and restores the context specified by @a _heir.
92 *
93 *  @param[in] _executing is the currently executing thread's context
94 *  @param[in] _heir is the context of the thread to be switched to
95 */
96#define _Context_Switch( _executing, _heir ) \
97   _CPU_Context_switch( _executing, _heir )
98
99/**
100 *  @brief Restart Currently Executing Thread
101 *
102 *  This routine restarts the calling thread by restoring its initial
103 *  stack pointer and returning to the thread's entry point.
104 *
105 *  @param[in] _the_context is the context of the thread to restart
106 */
107#define _Context_Restart_self( _the_context ) \
108   _CPU_Context_Restart_self( _the_context )
109
110/**
111 *  @brief Return Starting Address of Floating Point Context
112 *
113 *  This function returns the starting address of the floating
114 *  point context save area.  It is assumed that the are reserved
115 *  for the floating point save area is large enough.
116 *
117 *  @param[in] _base is lowest physical address of the floating point
118 *         context save area.
119 *  @param[in] _offset is the offset into the floating point area
120 *
121 *  @return the initial FP context pointer
122 */
123#define _Context_Fp_start( _base, _offset ) \
124   _CPU_Context_Fp_start( (_base), (_offset) )
125
126/**
127 *  @brief Initialize Floating Point Context Area
128 *
129 *  This routine initializes the floating point context save
130 *  area to contain an initial known state.
131 *
132 *  @param[in] _fp_area is the base address of the floating point
133 *         context save area to initialize.
134 */
135#define _Context_Initialize_fp( _fp_area ) \
136   _CPU_Context_Initialize_fp( _fp_area )
137
138/**
139 *  @brief Restore Floating Point Context Area
140 *
141 *  This routine restores the floating point context contained
142 *  in the @a _fp area.  It is assumed that the current
143 *  floating point context has been saved by a previous invocation
144 *  of @a _Context_Save_fp.
145 *
146 *  @param[in] _fp points to the floating point context area to restore.
147 */
148#define _Context_Restore_fp( _fp ) \
149   _CPU_Context_restore_fp( _fp )
150
151/**
152 *  @brief Save Floating Point Context Area
153 *
154 *  This routine saves the current floating point context
155 *  in the @a _fp area.
156 *
157 *  @param[in] _fp points to the floating point context area to restore.
158 */
159#define _Context_Save_fp( _fp ) \
160   _CPU_Context_save_fp( _fp )
161
162#ifdef __cplusplus
163}
164#endif
165
166/**@}*/
167
168#endif
169/* end of include file */
Note: See TracBrowser for help on using the repository browser.