[981b99f] | 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 | * $Id$ |
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| 9 | * |
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| 10 | ************************************************************************** |
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| 11 | */ |
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| 12 | |
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| 13 | #include <rtems.h> |
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| 14 | #include <rtems/error.h> |
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| 15 | #include <assert.h> |
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| 16 | #include <errno.h> |
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| 17 | #include <rdbg/rdbg.h> |
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| 18 | #include <rdbg/servrpc.h> |
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| 19 | |
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| 20 | /* ----------------------------------------------------------------- |
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| 21 | Maping of hardware exceptions into Unix-like signal numbers. |
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| 22 | It is identical to the one used by the PM and the AM. |
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| 23 | ----------------------------------------------------------------- */ |
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| 24 | |
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| 25 | int |
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| 26 | ExcepToSig (Exception_context *ctx) |
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| 27 | { |
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| 28 | int excep = getExcNum (ctx); |
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| 29 | |
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| 30 | |
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| 31 | switch (excep) { |
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| 32 | |
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| 33 | case I386_EXCEPTION_MATH_COPROC_UNAVAIL: |
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| 34 | case I386_EXCEPTION_I386_COPROC_SEG_ERR: |
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| 35 | case I386_EXCEPTION_FLOAT_ERROR: |
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| 36 | case I386_EXCEPTION_BOUND: |
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| 37 | return SIGFPE; |
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| 38 | |
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| 39 | case I386_EXCEPTION_DEBUG: |
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| 40 | case I386_EXCEPTION_BREAKPOINT: |
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| 41 | case I386_EXCEPTION_ENTER_RDBG: |
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| 42 | return SIGTRAP; |
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| 43 | |
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| 44 | case I386_EXCEPTION_OVERFLOW: |
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| 45 | case I386_EXCEPTION_DIVIDE_BY_ZERO: |
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| 46 | case I386_EXCEPTION_ILLEGAL_INSTR: |
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| 47 | return SIGILL; |
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| 48 | |
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| 49 | case I386_EXCEPTION_SEGMENT_NOT_PRESENT: |
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| 50 | case I386_EXCEPTION_STACK_SEGMENT_FAULT: |
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| 51 | case I386_EXCEPTION_GENERAL_PROT_ERR: |
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| 52 | case I386_EXCEPTION_PAGE_FAULT: |
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| 53 | return SIGSEGV; |
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| 54 | |
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| 55 | default: |
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| 56 | break; |
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| 57 | } |
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| 58 | return SIGKILL; |
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| 59 | } |
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| 60 | |
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| 61 | |
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| 62 | /*----- Breakpoint Exception management -----*/ |
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| 63 | |
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| 64 | /* |
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| 65 | * Handler for Breakpoint Exceptions : |
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| 66 | * software breakpoints. |
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| 67 | */ |
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| 68 | |
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| 69 | void |
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| 70 | BreakPointExcHdl(CPU_Exception_frame *ctx) |
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| 71 | { |
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| 72 | rtems_status_code status; |
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| 73 | rtems_id continueSemId; |
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| 74 | |
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| 75 | if ( (justSaveContext) && (ctx->idtIndex == I386_EXCEPTION_ENTER_RDBG) ) { |
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| 76 | PushSavedExceptCtx (_Thread_Executing->Object.id, ctx); |
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| 77 | justSaveContext = 0; |
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| 78 | } |
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| 79 | else { |
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| 80 | if (ctx->idtIndex != I386_EXCEPTION_DEBUG){ |
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| 81 | NbSerializedCtx++; |
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| 82 | rtems_semaphore_obtain(serializeSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 83 | NbSerializedCtx--; |
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| 84 | } |
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| 85 | |
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| 86 | currentTargetThread = _Thread_Executing->Object.id; |
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| 87 | |
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| 88 | #ifdef DDEBUG |
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| 89 | printk("----------------------------------------------------------\n"); |
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| 90 | printk("Exception %d caught at PC %x by thread %d\n", |
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| 91 | ctx->idtIndex, |
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| 92 | ctx->eip, |
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| 93 | _Thread_Executing->Object.id); |
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| 94 | printk("----------------------------------------------------------\n"); |
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| 95 | printk("Processor execution context at time of the fault was :\n"); |
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| 96 | printk("----------------------------------------------------------\n"); |
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| 97 | printk(" EAX = %x EBX = %x ECX = %x EDX = %x\n", |
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| 98 | ctx->eax, ctx->ebx, ctx->ecx, ctx->edx); |
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| 99 | printk(" ESI = %x EDI = %x EBP = %x ESP = %x\n", |
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| 100 | ctx->esi, ctx->edi, ctx->ebp, ctx->esp0); |
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| 101 | printk("----------------------------------------------------------\n"); |
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| 102 | printk("Error code pushed by processor itself (if not 0) = %x\n", |
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| 103 | ctx->faultCode); |
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| 104 | printk("----------------------------------------------------------\n\n"); |
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| 105 | #endif |
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| 106 | |
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| 107 | status = rtems_semaphore_create (rtems_build_name('D', 'B', 'G', 'c'), |
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| 108 | 0, |
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| 109 | RTEMS_FIFO | |
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| 110 | RTEMS_COUNTING_SEMAPHORE | |
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| 111 | RTEMS_NO_INHERIT_PRIORITY | |
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| 112 | RTEMS_NO_PRIORITY_CEILING | |
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| 113 | RTEMS_LOCAL, |
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| 114 | 0, |
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| 115 | &continueSemId); |
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| 116 | if (status != RTEMS_SUCCESSFUL) |
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| 117 | rtems_panic ("Can't create continue semaphore: `%s'\n",rtems_status_text(status)); |
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| 118 | |
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| 119 | PushExceptCtx (_Thread_Executing->Object.id, continueSemId, ctx); |
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| 120 | |
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| 121 | switch (ctx->idtIndex){ |
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| 122 | case I386_EXCEPTION_DEBUG: |
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| 123 | DPRINTF((" DEBUG EXCEPTION !!!\n")); |
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| 124 | ctx->eflags &= ~EFLAGS_TF; |
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| 125 | ExitForSingleStep-- ; |
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| 126 | rtems_semaphore_release( wakeupEventSemId ); |
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| 127 | break; |
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| 128 | |
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| 129 | case I386_EXCEPTION_BREAKPOINT: |
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| 130 | DPRINTF((" BREAKPOINT EXCEPTION !!!\n")); |
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| 131 | rtems_semaphore_release( wakeupEventSemId ); |
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| 132 | break; |
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| 133 | |
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| 134 | case I386_EXCEPTION_ENTER_RDBG: |
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| 135 | DPRINTF((" ENTER RDBG !!!\n")); |
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| 136 | rtems_semaphore_release( wakeupEventSemId ); |
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| 137 | break; |
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| 138 | |
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| 139 | default: |
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| 140 | DPRINTF((" OTHER EXCEPTION !!!\n")); |
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| 141 | rtems_semaphore_release( wakeupEventSemId ); |
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| 142 | break; |
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| 143 | } |
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| 144 | |
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| 145 | rtems_semaphore_obtain(continueSemId, RTEMS_WAIT, RTEMS_NO_TIMEOUT); |
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| 146 | |
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| 147 | PopExceptCtx (_Thread_Executing->Object.id); |
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| 148 | rtems_semaphore_delete(continueSemId); |
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| 149 | } |
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| 150 | } |
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| 151 | |
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| 152 | |
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| 153 | |
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