mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-20 21:08:51 +00:00
88 lines
3.3 KiB
C#
88 lines
3.3 KiB
C#
using System;
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using System.Linq;
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using Cosmos.Assembler;
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using Cosmos.Assembler.x86;
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namespace Cosmos.Debug.DebugStub {
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public class CmdAsmBreak : Cosmos.Assembler.Code {
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public CmdAsmBreak(Assembler.Assembler aAssembler) : base(aAssembler) {}
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public override void Assemble() {
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new Comment("X#: Group DebugStub");
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new Comment("Location where INT3 has been injected.");
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new Comment("0 if no INT3 is active.");
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new Comment("X#: var AsmBreakEIP");
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mAssembler.DataMembers.Add(new DataMember("DebugStub_AsmBreakEIP", 0));
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new Comment("Old byte before INT3 was injected.");
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new Comment("Only 1 byte is used.");
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new Comment("X#: var AsmOrigByte");
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mAssembler.DataMembers.Add(new DataMember("DebugStub_AsmOrigByte", 0));
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new Comment("X#: procedure SetAsmBreak {");
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new Label("DebugStub_SetAsmBreak");
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new Comment("X#: Call .ComReadEAX");
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new Call { DestinationLabel = "DebugStub_ComReadEAX" };
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new Comment("X#: EDI = EAX");
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new Mov{ DestinationReg = RegistersEnum.EDI, SourceReg = RegistersEnum.EAX };
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new Comment("Save the old byte");
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new Comment("X#: EAX = EDI[0]");
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new Mov{ DestinationReg = RegistersEnum.EAX, SourceReg = RegistersEnum.EDI, SourceIsIndirect = true, SourceDisplacement = 0 };
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new Comment("X#: .AsmOrigByte = EAX");
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new Mov { DestinationRef = Cosmos.Assembler.ElementReference.New("DebugStub_AsmOrigByte"), DestinationIsIndirect = true , SourceReg = RegistersEnum.EAX };
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new Comment("Inject INT3");
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new Comment("X#: EDI[0] = $CC");
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new Mov{ DestinationReg = RegistersEnum.EDI, DestinationIsIndirect = true, DestinationDisplacement = 0, SourceValue = 0xCC };
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new Comment("Save EIP of the break");
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new Comment("X#: .AsmBreakEIP = EDI");
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new Mov { DestinationRef = Cosmos.Assembler.ElementReference.New("DebugStub_AsmBreakEIP"), DestinationIsIndirect = true , SourceReg = RegistersEnum.EDI };
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new Comment("X#: }");
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new Label("DebugStub_SetAsmBreak_Exit");
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new Return();
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new Comment("X#: procedure ClearAsmBreak {");
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new Label("DebugStub_ClearAsmBreak");
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new Comment("X#: EDI = .AsmBreakEIP");
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new Mov { DestinationReg = RegistersEnum.EDI , SourceRef = Cosmos.Assembler.ElementReference.New("DebugStub_AsmBreakEIP"), SourceIsIndirect = true };
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new Comment("If 0, we don't need to clear an older one.");
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new Comment("X#: If (EDI = 0) exit");
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new Compare { DestinationReg = RegistersEnum.EDI, SourceValue = 0 };
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new ConditionalJump { Condition = ConditionalTestEnum.Zero, DestinationLabel = "DebugStub_ClearAsmBreak_Exit" };
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new Comment("Clear old break point and set back to original opcode / partial opcode");
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new Comment("X#: EAX = .AsmOrigByte");
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new Mov { DestinationReg = RegistersEnum.EAX , SourceRef = Cosmos.Assembler.ElementReference.New("DebugStub_AsmOrigByte"), SourceIsIndirect = true };
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new Comment("X#: EDI[0] = EAX");
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new Mov{ DestinationReg = RegistersEnum.EDI, DestinationIsIndirect = true, DestinationDisplacement = 0, SourceReg = RegistersEnum.EAX };
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new Comment("X#: .AsmOrigByte = 0");
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new Mov { DestinationRef = Cosmos.Assembler.ElementReference.New("DebugStub_AsmOrigByte"), DestinationIsIndirect = true , SourceValue = 0 };
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new Comment("X#: }");
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new Label("DebugStub_ClearAsmBreak_Exit");
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new Return();
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}
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}
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}
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