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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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><P
>Most synchronous exception VSR table entries will point to a default
exception VSR which is responsible for handling all exceptions in a
generic manner. The default VSR simply saves the CPU state, makes any
adjustments to the CPU state that is necessary, and calls
<TT
CLASS="FUNCTION"
>cyg_hal_exception_handler()</TT
>.</P
><P
><TT
CLASS="FUNCTION"
>cyg_hal_exception_handler()</TT
> needs to pass the
exception on to some handling code.  There are two basic destinations:
enter GDB or pass the exception up to eCos. Exactly which
destination is taken depends on the configuration. When the GDB stubs are
included then the exception is passed to them, otherwise it is passed
to eCos.</P
><P
>If an eCos application has been loaded by RedBoot then the VSR table
entries will all point into RedBoot's exception VSR, and will
therefore enter GDB if an exception occurs. If the eCos application
wants to handle an exception itself, it needs to replace the the VSR
table entry with one pointing to its own VSR. It can do this with the
<TT
CLASS="FUNCTION"
>HAL_VSR_SET_TO_ECOS_HANDLER()</TT
> macro.</P
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Line No.	Rev	Author	Line
1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>Default Synchronous Exception Handling</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos Reference Manual"`
20			`HREF="ecos-ref.html"><LINK`
21			`REL="UP"`
22			`TITLE="Exception Handling"`
23			`HREF="hal-exception-handling.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="Vectors and VSRs"`
26			`HREF="hal-vectors-and-vsrs.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Default Interrupt Handling"`
29			`HREF="hal-default-interrupt-handling.html"></HEAD`
30			`><BODY`
31			`CLASS="SECTION"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
35			`VLINK="#840084"`
36			`ALINK="#0000FF"`
37			`><DIV`
38			`CLASS="NAVHEADER"`
39			`><TABLE`
40			`SUMMARY="Header navigation table"`
41			`WIDTH="100%"`
42			`BORDER="0"`
43			`CELLPADDING="0"`
44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos Reference Manual</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="hal-vectors-and-vsrs.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`>Chapter 10. Exception Handling</TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="hal-default-interrupt-handling.html"`
72			`ACCESSKEY="N"`
73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="SECTION"`
82			`><H1`
83			`CLASS="SECTION"`
84			`><A`
85			`NAME="HAL-DEFAULT-SYNCHRONOUS-EXCEPTION-HANDLING">Default Synchronous Exception Handling</H1`
86			`><P`
87			`>Most synchronous exception VSR table entries will point to a default`
88			`exception VSR which is responsible for handling all exceptions in a`
89			`generic manner. The default VSR simply saves the CPU state, makes any`
90			`adjustments to the CPU state that is necessary, and calls`
91			`<TT`
92			`CLASS="FUNCTION"`
93			`>cyg_hal_exception_handler()</TT`
94			`>.</P`
95			`><P`
96			`><TT`
97			`CLASS="FUNCTION"`
98			`>cyg_hal_exception_handler()</TT`
99			`> needs to pass the`
100			`exception on to some handling code. There are two basic destinations:`
101			`enter GDB or pass the exception up to eCos. Exactly which`
102			`destination is taken depends on the configuration. When the GDB stubs are`
103			`included then the exception is passed to them, otherwise it is passed`
104			`to eCos.</P`
105			`><P`
106			`>If an eCos application has been loaded by RedBoot then the VSR table`
107			`entries will all point into RedBoot's exception VSR, and will`
108			`therefore enter GDB if an exception occurs. If the eCos application`
109			`wants to handle an exception itself, it needs to replace the the VSR`
110			`table entry with one pointing to its own VSR. It can do this with the`
111			`<TT`
112			`CLASS="FUNCTION"`
113			`>HAL_VSR_SET_TO_ECOS_HANDLER()</TT`
114			`> macro.</P`
115			`></DIV`
116			`><DIV`
117			`CLASS="NAVFOOTER"`
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120			`WIDTH="100%"><TABLE`
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129			`ALIGN="left"`
130			`VALIGN="top"`
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132			`HREF="hal-vectors-and-vsrs.html"`
133			`ACCESSKEY="P"`
134			`>Prev</A`
135			`></TD`
136			`><TD`
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143			`>Home</A`
144			`></TD`
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147			`ALIGN="right"`
148			`VALIGN="top"`
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150			`HREF="hal-default-interrupt-handling.html"`
151			`ACCESSKEY="N"`
152			`>Next</A`
153			`></TD`
154			`></TR`
155			`><TR`
156			`><TD`
157			`WIDTH="33%"`
158			`ALIGN="left"`
159			`VALIGN="top"`
160			`>Vectors and VSRs</TD`
161			`><TD`
162			`WIDTH="34%"`
163			`ALIGN="center"`
164			`VALIGN="top"`
165			`><A`
166			`HREF="hal-exception-handling.html"`
167			`ACCESSKEY="U"`
168			`>Up</A`
169			`></TD`
170			`><TD`
171			`WIDTH="33%"`
172			`ALIGN="right"`
173			`VALIGN="top"`
174			`>Default Interrupt Handling</TD`
175			`></TR`
176			`></TABLE`
177			`></DIV`
178			`></BODY`
179			`></HTML`
180			`>`

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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [doc/] [html/] [ref/] [hal-default-synchronous-exception-handling.html] - Blame information for rev 174