mirror of
https://github.com/danbulant/Cosmos
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40 lines
809 B
Text
40 lines
809 B
Text
namespace DebugStub
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// Location where INT3 has been injected.
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// 0 if no INT3 is active.
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var AsmBreakEIP
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// Old byte before INT3 was injected.
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// Only 1 byte is used.
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var AsmOrigByte
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function SetAsmBreak {
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ClearAsmBreak()
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ComReadEAX()
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EDI = EAX
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// Save EIP of the break
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.AsmBreakEIP = EDI
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// Save the old byte
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AL = EDI[0]
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.AsmOrigByte = AL
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// Inject INT3
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// Do in 2 steps to force a byte move to RAM (till X# can do byte in one step)
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AL = $CC
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EDI[0] = AL
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}
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function ClearAsmBreak {
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EDI = .AsmBreakEIP
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// If 0, we don't need to clear an older one.
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if EDI = 0 return
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// Clear old break point and set back to original opcode / partial opcode
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AL = .AsmOrigByte
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EDI[0] = AL
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.AsmBreakEIP = 0
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}
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