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This commit is contained in:
kudzu_cp 2008-09-17 03:33:11 +00:00
parent 0a0d636910
commit 7e48564529
1 changed files with 7 additions and 1 deletions
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8
source/Indy.IL2CPU.Assembler.X86/SpecialDebug/DebugStub.cs
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@ -143,7 +143,11 @@ namespace Indy.IL2CPU.Assembler.X86 {
Return();
}
// Input: ESI
// Output: None
// Modifies: EAX, EDX
//
// Sends byte at [ESI] to com port and does esi + 1
protected void WriteByteToComPort() {
// This sucks to use the stack, but x86 can only read and write ports from AL and
// we need to read a port before we can write out the value to another port.
@ -154,8 +158,10 @@ namespace Indy.IL2CPU.Assembler.X86 {
// the code and causes interaction with other code. DebugStub should be
// as isolated as possible from any other code.
Label = "WriteByteToComPort";
Label = "WriteByteToComPort_Wait";
// Sucks again to use DX just for this, but x86 only supports
// 8 bit address for literals on ports
DX = mComStatusAddr;
Label = "WriteByteToComPort_Wait";
AL = Port[DX];
AL.Test(0x20);
JumpIf(Flags.Zero, "WriteByteToComPort_Wait");