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Diffstat (limited to 'bsps/powerpc/mvme5500/include/bsp/bspException.h')
-rw-r--r-- | bsps/powerpc/mvme5500/include/bsp/bspException.h | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/bsps/powerpc/mvme5500/include/bsp/bspException.h b/bsps/powerpc/mvme5500/include/bsp/bspException.h new file mode 100644 index 0000000000..7cd816e818 --- /dev/null +++ b/bsps/powerpc/mvme5500/include/bsp/bspException.h @@ -0,0 +1,99 @@ +#ifndef BSP_EXCEPTION_HANDLER_H +#define BSP_EXCEPTION_HANDLER_H + +/* A slightly improved exception 'default' exception handler for RTEMS / SVGM */ + +/* + * Authorship + * ---------- + * This software was created by + * Till Straumann <strauman@slac.stanford.edu>, 5/2002, + * Stanford Linear Accelerator Center, Stanford University. + * + * Acknowledgement of sponsorship + * ------------------------------ + * This software was produced by + * the Stanford Linear Accelerator Center, Stanford University, + * under Contract DE-AC03-76SFO0515 with the Department of Energy. + * + * Government disclaimer of liability + * ---------------------------------- + * Neither the United States nor the United States Department of Energy, + * nor any of their employees, makes any warranty, express or implied, or + * assumes any legal liability or responsibility for the accuracy, + * completeness, or usefulness of any data, apparatus, product, or process + * disclosed, or represents that its use would not infringe privately owned + * rights. + * + * Stanford disclaimer of liability + * -------------------------------- + * Stanford University makes no representations or warranties, express or + * implied, nor assumes any liability for the use of this software. + * + * Stanford disclaimer of copyright + * -------------------------------- + * Stanford University, owner of the copyright, hereby disclaims its + * copyright and all other rights in this software. Hence, anyone may + * freely use it for any purpose without restriction. + * + * Maintenance of notices + * ---------------------- + * In the interest of clarity regarding the origin and status of this + * SLAC software, this and all the preceding Stanford University notices + * are to remain affixed to any copy or derivative of this software made + * or distributed by the recipient and are to be affixed to any copy of + * software made or distributed by the recipient that contains a copy or + * derivative of this software. + * + * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03 + */ + +#include <bsp/vectors.h> + +/* Two types of exception intercepting / catching is supported: + * + * - lowlevel handling (runs at IRQ level, before restoring any + * task context). + * - highlevel handling. + * + * A lowlevel user hook is invoked twice, before and after processing + * (printing) the exception. + * If the user hook returns a nonzero value, normal processing + * is skipped (including the second call to the hook) + * + * If the hook returns nonzero to the second call, no default + * 'panic' occurs. + * + * Default 'panic': + * - if a task context is available: + * - if a highlevel handler is installed, pass control + * to the highlevel handler when returning from the + * exception (the highlevel handler should probably + * do a longjmp()). Otherwise: + * - try to suspend interrupted task. + * - hang if no task context is available. + * + */ + +typedef struct BSP_ExceptionExtensionRec_ *BSP_ExceptionExtension; + +typedef int (*BSP_ExceptionHookProc)(BSP_Exception_frame *frame, BSP_ExceptionExtension ext, int after); + +typedef struct BSP_ExceptionExtensionRec_ { + BSP_ExceptionHookProc lowlevelHook; + int quiet; /* silence the exception handler */ + void (*highlevelHook)(BSP_ExceptionExtension); + /* user fields may be added after this */ +} BSP_ExceptionExtensionRec; + +#define SRR1_TEA_EXC (1<<(31-13)) +#define SRR1_MCP_EXC (1<<(31-12)) + +void +BSP_exceptionHandler(BSP_Exception_frame* excPtr); + +/* install an exception handler to the current task context */ +BSP_ExceptionExtension +BSP_exceptionHandlerInstall(BSP_ExceptionExtension e); + +#endif |