mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-19 12:30:32 +00:00
245 lines
5.4 KiB
NASM
245 lines
5.4 KiB
NASM
DebugStub_CallerEBP dd 0
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DebugStub_CallerEIP dd 0
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DebugStub_CallerESP dd 0
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DebugStub_TraceMode dd 0
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DebugStub_DebugStatus dd 0
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DebugStub_PushAllPtr dd 0
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DebugStub_DebugBreakOnNextTrace dd 0
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DebugStub_BreakEBP dd 0
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DebugStub_CommandID dd 0
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DebugStub_BreakOnAddress:
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Pushad
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Call DebugStub_ComReadEAX
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Mov ECX, EAX
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Mov EAX, 0
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Call DebugStub_ComReadAL
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Push EAX
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Mov EBX, DebugStub_DebugBPs
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SHL EAX, 2
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Add EBX, EAX
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Cmp ECX, 0
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JNE DebugStub_BreakOnAddress_Block1_End
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Mov EDI, [EBX + 0]
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Mov AL, 0x90
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Mov [EDI + 0], AL
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Jmp DebugStub_BreakOnAddress_DontSetBP
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DebugStub_BreakOnAddress_Block1_End:
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Mov [EBX + 0], ECX
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Mov EDI, [EBX + 0]
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Mov AL, 0xCC
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Mov [EDI + 0], AL
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DebugStub_BreakOnAddress_DontSetBP:
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Pop EAX
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Mov ECX, 256
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DebugStub_BreakOnAddress_FindBPLoop:
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Dec ECX
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Mov EBX, DebugStub_DebugBPs
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Mov EAX, ECX
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SHL EAX, 2
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Add EBX, EAX
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Mov EAX, [EBX + 0]
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Cmp EAX, 0
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JE DebugStub_BreakOnAddress_Block2_End
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Inc ECX
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Mov [DebugStub_MaxBPId], ECX
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Jmp DebugStub_BreakOnAddress_Continue
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DebugStub_BreakOnAddress_Block2_End:
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Cmp ECX, 0
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JNE DebugStub_BreakOnAddress_Block3_End
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Jmp DebugStub_BreakOnAddress_FindBPLoopExit
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DebugStub_BreakOnAddress_Block3_End:
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Jmp DebugStub_BreakOnAddress_FindBPLoop
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DebugStub_BreakOnAddress_FindBPLoopExit:
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Mov dword [DebugStub_MaxBPId], 0
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DebugStub_BreakOnAddress_Continue:
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DebugStub_BreakOnAddress_Exit:
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Popad
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Ret
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DebugStub_SetINT3:
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Pushad
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Call DebugStub_ComReadEAX
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Mov EDI, EAX
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Mov AL, 0xCC
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Mov [EDI + 0], AL
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DebugStub_SetINT3_Exit:
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Popad
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Ret
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DebugStub_ClearINT3:
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Pushad
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Call DebugStub_ComReadEAX
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Mov EDI, EAX
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Mov AL, 0x90
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Mov [EDI + 0], AL
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DebugStub_ClearINT3_Exit:
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Popad
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Ret
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DebugStub_Executing:
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MOV EAX, DR6
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And EAX, 0x4000
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Cmp EAX, 0x4000
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JNE DebugStub_Executing_Block1_End
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And EAX, 0xBFFF
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MOV DR6, EAX
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Call DebugStub_ResetINT1_TrapFLAG
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Call DebugStub_Break
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Jmp DebugStub_Executing_Normal
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DebugStub_Executing_Block1_End:
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Mov EAX, [DebugStub_CallerEIP]
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Cmp EAX, [DebugStub_AsmBreakEIP]
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JNE DebugStub_Executing_Block2_End
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Call DebugStub_DoAsmBreak
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Jmp DebugStub_Executing_Normal
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DebugStub_Executing_Block2_End:
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Mov EAX, [DebugStub_MaxBPId]
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Cmp EAX, 0
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JNE DebugStub_Executing_Block3_End
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Jmp DebugStub_Executing_SkipBPScan
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DebugStub_Executing_Block3_End:
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Mov EAX, [DebugStub_CallerEIP]
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Mov EDI, DebugStub_DebugBPs
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Mov ECX, [DebugStub_MaxBPId]
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repne scasd
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JNE DebugStub_Executing_Block4_End
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Call DebugStub_Break
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Jmp DebugStub_Executing_Normal
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DebugStub_Executing_Block4_End:
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DebugStub_Executing_SkipBPScan:
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Cmp dword [DebugStub_DebugBreakOnNextTrace], DebugStub_Const_StepTrigger_Into
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JNE DebugStub_Executing_Block5_End
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Call DebugStub_Break
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Jmp DebugStub_Executing_Normal
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DebugStub_Executing_Block5_End:
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Mov EAX, [DebugStub_CallerEBP]
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Cmp dword [DebugStub_DebugBreakOnNextTrace], DebugStub_Const_StepTrigger_Over
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JNE DebugStub_Executing_Block6_End
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Cmp EAX, [DebugStub_BreakEBP]
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JB DebugStub_Executing_Block7_End
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Call DebugStub_Break
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DebugStub_Executing_Block7_End:
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Jmp DebugStub_Executing_Normal
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DebugStub_Executing_Block6_End:
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Cmp dword [DebugStub_DebugBreakOnNextTrace], DebugStub_Const_StepTrigger_Out
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JNE DebugStub_Executing_Block8_End
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Cmp EAX, [DebugStub_BreakEBP]
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JBE DebugStub_Executing_Block9_End
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Call DebugStub_Break
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DebugStub_Executing_Block9_End:
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Jmp DebugStub_Executing_Normal
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DebugStub_Executing_Block8_End:
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DebugStub_Executing_Normal:
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Cmp dword [DebugStub_TraceMode], DebugStub_Const_Tracing_On
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JNE DebugStub_Executing_Block10_End
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Call DebugStub_SendTrace
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DebugStub_Executing_Block10_End:
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DebugStub_Executing_CheckForCmd:
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Mov DX, [DebugStub_ComAddr]
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Add DX, 5
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In AL, DX
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Test AL, 1
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JZ DebugStub_Executing_Block11_End
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Call DebugStub_ProcessCommand
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Jmp DebugStub_Executing_CheckForCmd
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DebugStub_Executing_Block11_End:
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DebugStub_Executing_Exit:
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Ret
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DebugStub_Break:
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Mov dword [DebugStub_DebugBreakOnNextTrace], DebugStub_Const_StepTrigger_None
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Mov dword [DebugStub_BreakEBP], 0
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Mov dword [DebugStub_DebugStatus], DebugStub_Const_Status_Break
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Call DebugStub_SendTrace
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DebugStub_Break_WaitCmd:
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Call DebugStub_ProcessCommand
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Cmp AL, DebugStub_Const_Vs2Ds_Continue
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JE DebugStub_Break_Done
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Cmp AL, DebugStub_Const_Vs2Ds_AsmStepInto
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JNE DebugStub_Break_Block1_End
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Call DebugStub_SetINT1_TrapFLAG
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Jmp DebugStub_Break_Done
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DebugStub_Break_Block1_End:
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Cmp AL, DebugStub_Const_Vs2Ds_SetAsmBreak
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JNE DebugStub_Break_Block2_End
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Call DebugStub_SetAsmBreak
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Call DebugStub_AckCommand
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Jmp DebugStub_Break_WaitCmd
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DebugStub_Break_Block2_End:
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Cmp AL, DebugStub_Const_Vs2Ds_StepInto
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JNE DebugStub_Break_Block3_End
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Mov dword [DebugStub_DebugBreakOnNextTrace], DebugStub_Const_StepTrigger_Into
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Mov [DebugStub_BreakEBP], EAX
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Jmp DebugStub_Break_Done
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DebugStub_Break_Block3_End:
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Cmp AL, DebugStub_Const_Vs2Ds_StepOver
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JNE DebugStub_Break_Block4_End
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Mov dword [DebugStub_DebugBreakOnNextTrace], DebugStub_Const_StepTrigger_Over
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Mov EAX, [DebugStub_CallerEBP]
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Mov [DebugStub_BreakEBP], EAX
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Jmp DebugStub_Break_Done
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DebugStub_Break_Block4_End:
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Cmp AL, DebugStub_Const_Vs2Ds_StepOut
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JNE DebugStub_Break_Block5_End
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Mov dword [DebugStub_DebugBreakOnNextTrace], DebugStub_Const_StepTrigger_Out
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Mov EAX, [DebugStub_CallerEBP]
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Mov [DebugStub_BreakEBP], EAX
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Jmp DebugStub_Break_Done
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DebugStub_Break_Block5_End:
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Jmp DebugStub_Break_WaitCmd
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DebugStub_Break_Done:
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Call DebugStub_AckCommand
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Mov dword [DebugStub_DebugStatus], DebugStub_Const_Status_Run
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DebugStub_Break_Exit:
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Ret
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