1 | #ifndef BSP_EXCEPTION_HANDLER_H |
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2 | #define BSP_EXCEPTION_HANDLER_H |
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3 | |
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4 | /* A slightly improved exception 'default' exception handler for RTEMS / SVGM */ |
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5 | |
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6 | /* |
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7 | * Authorship |
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8 | * ---------- |
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9 | * This software was created by |
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10 | * Till Straumann <strauman@slac.stanford.edu>, 5/2002, |
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11 | * Stanford Linear Accelerator Center, Stanford University. |
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12 | * |
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13 | * Acknowledgement of sponsorship |
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14 | * ------------------------------ |
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15 | * This software was produced by |
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16 | * the Stanford Linear Accelerator Center, Stanford University, |
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17 | * under Contract DE-AC03-76SFO0515 with the Department of Energy. |
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18 | * |
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19 | * Government disclaimer of liability |
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20 | * ---------------------------------- |
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21 | * Neither the United States nor the United States Department of Energy, |
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22 | * nor any of their employees, makes any warranty, express or implied, or |
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23 | * assumes any legal liability or responsibility for the accuracy, |
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24 | * completeness, or usefulness of any data, apparatus, product, or process |
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25 | * disclosed, or represents that its use would not infringe privately owned |
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26 | * rights. |
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27 | * |
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28 | * Stanford disclaimer of liability |
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29 | * -------------------------------- |
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30 | * Stanford University makes no representations or warranties, express or |
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31 | * implied, nor assumes any liability for the use of this software. |
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32 | * |
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33 | * Stanford disclaimer of copyright |
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34 | * -------------------------------- |
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35 | * Stanford University, owner of the copyright, hereby disclaims its |
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36 | * copyright and all other rights in this software. Hence, anyone may |
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37 | * freely use it for any purpose without restriction. |
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38 | * |
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39 | * Maintenance of notices |
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40 | * ---------------------- |
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41 | * In the interest of clarity regarding the origin and status of this |
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42 | * SLAC software, this and all the preceding Stanford University notices |
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43 | * are to remain affixed to any copy or derivative of this software made |
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44 | * or distributed by the recipient and are to be affixed to any copy of |
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45 | * software made or distributed by the recipient that contains a copy or |
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46 | * derivative of this software. |
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47 | * |
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48 | * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03 |
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49 | */ |
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50 | |
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51 | #include <bsp/vectors.h> |
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52 | |
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53 | /* Two types of exception intercepting / catching is supported: |
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54 | * |
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55 | * - lowlevel handling (runs at IRQ level, before restoring any |
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56 | * task context). |
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57 | * - highlevel handling. |
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58 | * |
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59 | * A lowlevel user hook is invoked twice, before and after processing |
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60 | * (printing) the exception. |
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61 | * If the user hook returns a nonzero value, normal processing |
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62 | * is skipped (including the second call to the hook) |
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63 | * |
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64 | * If the hook returns nonzero to the second call, no default |
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65 | * 'panic' occurs. |
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66 | * |
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67 | * Default 'panic': |
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68 | * - if a task context is available: |
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69 | * - if a highlevel handler is installed, pass control |
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70 | * to the highlevel handler when returning from the |
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71 | * exception (the highlevel handler should probably |
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72 | * do a longjmp()). Otherwise: |
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73 | * - try to suspend interrupted task. |
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74 | * - hang if no task context is available. |
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75 | * |
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76 | */ |
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77 | |
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78 | typedef struct BSP_ExceptionExtensionRec_ *BSP_ExceptionExtension; |
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79 | |
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80 | typedef int (*BSP_ExceptionHookProc)(BSP_Exception_frame *frame, BSP_ExceptionExtension ext, int after); |
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81 | |
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82 | typedef struct BSP_ExceptionExtensionRec_ { |
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83 | BSP_ExceptionHookProc lowlevelHook; |
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84 | int quiet; /* silence the exception handler */ |
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85 | void (*highlevelHook)(BSP_ExceptionExtension); |
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86 | /* user fields may be added after this */ |
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87 | } BSP_ExceptionExtensionRec; |
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88 | |
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89 | #define SRR1_TEA_EXC (1<<(31-13)) |
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90 | #define SRR1_MCP_EXC (1<<(31-12)) |
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91 | |
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92 | void |
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93 | BSP_exceptionHandler(BSP_Exception_frame* excPtr); |
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94 | |
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95 | /* install an exception handler to the current task context */ |
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96 | BSP_ExceptionExtension |
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97 | BSP_exceptionHandlerInstall(BSP_ExceptionExtension e); |
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98 | |
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99 | #endif |
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