[4721cf1] | 1 | /* |
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| 2 | ************************************************************************** |
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| 3 | * |
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| 4 | * Component = |
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| 5 | * |
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| 6 | * Synopsis = rdbg/i386/excep.c |
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| 7 | * |
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| 8 | ************************************************************************** |
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| 9 | */ |
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| 10 | |
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| 11 | #include <rtems.h> |
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| 12 | #include <rtems/error.h> |
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| 13 | #include <rdbg/rdbg_f.h> |
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| 14 | #include <assert.h> |
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| 15 | #include <errno.h> |
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| 16 | #include <rdbg/rdbg.h> |
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| 17 | #include <rdbg/servrpc.h> |
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| 18 | |
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| 19 | |
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| 20 | extern rtems_id serializeSemId; |
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| 21 | extern rtems_id wakeupEventSemId; |
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| 22 | |
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| 23 | |
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| 24 | unsigned int NbExceptCtx; |
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| 25 | volatile unsigned int NbSerializedCtx; |
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| 26 | Exception_context *FirstCtx = NULL; |
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| 27 | Exception_context *LastCtx = NULL; |
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| 28 | |
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| 29 | CPU_Exception_frame SavedContext; |
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| 30 | |
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| 31 | |
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| 32 | /********* Save an exception context at the end of a list *****/ |
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| 33 | |
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| 34 | int PushExceptCtx ( Objects_Id Id, Objects_Id semId, CPU_Exception_frame *ctx ) { |
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| 35 | |
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| 36 | Exception_context *SaveCtx; |
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| 37 | |
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| 38 | SaveCtx = (Exception_context *)malloc(sizeof(Exception_context)); |
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| 39 | if (SaveCtx == NULL) |
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| 40 | rtems_panic("Can't allocate memory to save Exception context"); |
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| 41 | |
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| 42 | SaveCtx->id = Id; |
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| 43 | SaveCtx->ctx = ctx; |
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| 44 | SaveCtx->semaphoreId = semId; |
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| 45 | SaveCtx->previous = NULL; |
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| 46 | SaveCtx->next = NULL; |
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| 47 | |
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| 48 | if (FirstCtx == NULL){ /* initialization */ |
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| 49 | FirstCtx = SaveCtx; |
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| 50 | LastCtx = SaveCtx; |
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| 51 | NbExceptCtx = 1; |
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| 52 | } |
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| 53 | else { |
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| 54 | NbExceptCtx ++; |
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| 55 | LastCtx->next = SaveCtx; |
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| 56 | SaveCtx->previous = LastCtx; |
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| 57 | LastCtx = SaveCtx; |
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| 58 | } |
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| 59 | return 0; |
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| 60 | } |
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| 61 | |
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| 62 | /********* Save an temporary exception context in a ******/ |
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| 63 | /********* global variable ******/ |
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| 64 | |
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| 65 | int PushSavedExceptCtx ( Objects_Id Id, CPU_Exception_frame *ctx ) { |
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| 66 | |
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| 67 | memcpy (&(SavedContext), ctx, sizeof(CPU_Exception_frame)); |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |
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| 71 | |
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| 72 | /****** Remove the context of the specified Id thread *********/ |
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| 73 | /****** If Id = -1, then return the first context *********/ |
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| 74 | |
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| 75 | |
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| 76 | int PopExceptCtx ( Objects_Id Id ) { |
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| 77 | |
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| 78 | Exception_context *ExtractCtx; |
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| 79 | |
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| 80 | if (FirstCtx == NULL) return -1; |
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| 81 | |
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| 82 | if (Id == -1) { |
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| 83 | ExtractCtx = LastCtx; |
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| 84 | LastCtx = LastCtx->previous; |
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| 85 | free(ExtractCtx); |
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| 86 | NbExceptCtx --; |
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| 87 | return 0; |
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| 88 | } |
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| 89 | |
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| 90 | ExtractCtx = LastCtx; |
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| 91 | |
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| 92 | while (ExtractCtx->id != Id && ExtractCtx != NULL) { |
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| 93 | ExtractCtx = ExtractCtx->previous; |
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| 94 | } |
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| 95 | |
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| 96 | if (ExtractCtx == NULL) |
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| 97 | return -1; |
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| 98 | |
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| 99 | if ( ExtractCtx->previous != NULL) |
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| 100 | (ExtractCtx->previous)->next = ExtractCtx->next; |
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| 101 | |
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| 102 | if ( ExtractCtx->next != NULL) |
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| 103 | (ExtractCtx->next)->previous = ExtractCtx->previous; |
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| 104 | |
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| 105 | if (ExtractCtx == FirstCtx) |
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| 106 | FirstCtx = FirstCtx->next; |
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| 107 | else |
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| 108 | if (ExtractCtx == LastCtx) |
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| 109 | LastCtx = LastCtx->previous; |
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| 110 | |
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| 111 | free(ExtractCtx); |
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| 112 | NbExceptCtx --; |
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| 113 | return 0; |
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| 114 | } |
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| 115 | |
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| 116 | /****** Return the context of the specified Id thread *********/ |
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| 117 | /****** If Id = -1, then return the first context *********/ |
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| 118 | |
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| 119 | |
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| 120 | Exception_context *GetExceptCtx ( Objects_Id Id ) { |
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| 121 | |
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| 122 | Exception_context *ExtractCtx; |
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| 123 | |
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| 124 | if (FirstCtx == NULL) return NULL; |
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| 125 | |
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| 126 | if (Id == -1) { |
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| 127 | return LastCtx; |
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| 128 | } |
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| 129 | |
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| 130 | ExtractCtx = LastCtx; |
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| 131 | |
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| 132 | while (ExtractCtx->id != Id && ExtractCtx != NULL) { |
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| 133 | ExtractCtx = ExtractCtx->previous; |
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| 134 | } |
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| 135 | |
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| 136 | if (ExtractCtx == NULL) |
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| 137 | return NULL; |
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| 138 | |
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| 139 | return ExtractCtx; |
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| 140 | } |
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| 141 | |
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| 142 | /*----- Breakpoint Exception management -----*/ |
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| 143 | |
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| 144 | /* |
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| 145 | * Handler for Breakpoint Exceptions : |
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| 146 | * software breakpoints. |
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| 147 | */ |
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| 148 | |
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| 149 | void |
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| 150 | BreakPointExcHdl(CPU_Exception_frame *ctx) |
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| 151 | { |
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| 152 | rtems_status_code status; |
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| 153 | rtems_id continueSemId; |
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| 154 | |
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| 155 | if ( (justSaveContext) && (ctx->idtIndex == I386_EXCEPTION_ENTER_RDBG) ) { |
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| 156 | PushSavedExceptCtx (_Thread_Executing->Object.id, ctx); |
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| 157 | justSaveContext = 0; |
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| 158 | } |
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| 159 | else { |
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[eaefca90] | 160 | if (ctx->idtIndex != I386_EXCEPTION_DEBUG){ |
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[4721cf1] | 161 | NbSerializedCtx++; |
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| 162 | rtems_semaphore_obtain(serializeSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 163 | NbSerializedCtx--; |
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| 164 | } |
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| 165 | |
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| 166 | currentTargetThread = _Thread_Executing->Object.id; |
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| 167 | |
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| 168 | #ifdef DDEBUG |
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| 169 | printk("----------------------------------------------------------\n"); |
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| 170 | printk("Exception %d caught at PC %x by thread %d\n", |
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| 171 | ctx->idtIndex, |
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| 172 | ctx->eip, |
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| 173 | _Thread_Executing->Object.id); |
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| 174 | printk("----------------------------------------------------------\n"); |
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| 175 | printk("Processor execution context at time of the fault was :\n"); |
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| 176 | printk("----------------------------------------------------------\n"); |
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| 177 | printk(" EAX = %x EBX = %x ECX = %x EDX = %x\n", |
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| 178 | ctx->eax, ctx->ebx, ctx->ecx, ctx->edx); |
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| 179 | printk(" ESI = %x EDI = %x EBP = %x ESP = %x\n", |
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| 180 | ctx->esi, ctx->edi, ctx->ebp, ctx->esp0); |
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| 181 | printk("----------------------------------------------------------\n"); |
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| 182 | printk("Error code pushed by processor itself (if not 0) = %x\n", |
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| 183 | ctx->faultCode); |
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| 184 | printk("----------------------------------------------------------\n\n"); |
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| 185 | #endif |
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| 186 | |
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| 187 | status = rtems_semaphore_create (rtems_build_name('D', 'B', 'G', 'c'), |
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| 188 | 0, |
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| 189 | RTEMS_FIFO | |
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| 190 | RTEMS_COUNTING_SEMAPHORE | |
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| 191 | RTEMS_NO_INHERIT_PRIORITY | |
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| 192 | RTEMS_NO_PRIORITY_CEILING | |
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| 193 | RTEMS_LOCAL, |
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| 194 | 0, |
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| 195 | &continueSemId); |
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| 196 | if (status != RTEMS_SUCCESSFUL) |
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| 197 | rtems_panic ("Can't create continue semaphore: `%s'\n",rtems_status_text(status)); |
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| 198 | |
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| 199 | PushExceptCtx (_Thread_Executing->Object.id, continueSemId, ctx); |
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| 200 | |
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| 201 | switch (ctx->idtIndex){ |
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| 202 | case I386_EXCEPTION_DEBUG: |
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| 203 | DPRINTF((" DEBUG EXCEPTION !!!\n")); |
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| 204 | ctx->eflags &= ~EFLAGS_TF; |
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| 205 | ExitForSingleStep-- ; |
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| 206 | rtems_semaphore_release( wakeupEventSemId ); |
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| 207 | break; |
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| 208 | |
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| 209 | case I386_EXCEPTION_BREAKPOINT: |
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| 210 | DPRINTF((" BREAKPOINT EXCEPTION !!!\n")); |
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| 211 | rtems_semaphore_release( wakeupEventSemId ); |
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| 212 | break; |
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| 213 | |
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| 214 | case I386_EXCEPTION_ENTER_RDBG: |
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| 215 | DPRINTF((" ENTER RDBG !!!\n")); |
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| 216 | rtems_semaphore_release( wakeupEventSemId ); |
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| 217 | break; |
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| 218 | |
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| 219 | default: |
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| 220 | DPRINTF((" OTHER EXCEPTION !!!\n")); |
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| 221 | rtems_semaphore_release( wakeupEventSemId ); |
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| 222 | break; |
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| 223 | } |
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| 224 | |
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| 225 | rtems_semaphore_obtain(continueSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 226 | |
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| 227 | PopExceptCtx (_Thread_Executing->Object.id); |
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| 228 | rtems_semaphore_delete(continueSemId); |
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| 229 | } |
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| 230 | } |
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| 231 | |
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| 232 | |
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| 233 | |
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