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Fixes to tests and ModRM + SIB

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This commit is contained in:
bird_egop
2025-04-17 20:06:18 +03:00
parent 7c0e6d7f3a
commit 124493cd94
17 changed files with 215 additions and 188 deletions
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15
X86Disassembler/X86/Handlers/Idiv/IdivRm32Handler.cs
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@ -23,16 +23,19 @@ public class IdivRm32Handler : InstructionHandler
/// <returns>True if this handler can decode the opcode</returns>
public override bool CanHandle(byte opcode)
{
// IDIV r/m32 is encoded as 0xF7 with reg field 7
if (opcode != 0xF7)
return false;
// Check if the reg field of the ModR/M byte is 7 (IDIV)
// Check if we can read the ModR/M byte
if (!Decoder.CanReadByte())
return false;
// Check if the reg field of the ModR/M byte is 7 (IDIV)
var reg = ModRMDecoder.PeakModRMReg();
return reg == 7; // 7 = IDIV
// reg = 7 means IDIV operation
return reg == 7;
}
/// <summary>
@ -54,7 +57,13 @@ public class IdivRm32Handler : InstructionHandler
// Read the ModR/M byte
// For IDIV r/m32 (0xF7 /7):
// - The r/m field with mod specifies the operand (register or memory)
var (_, _, _, operand) = ModRMDecoder.ReadModRM();
var (mod, reg, rm, operand) = ModRMDecoder.ReadModRM();
// Verify that the reg field is 7 (IDIV)
if (reg != RegisterIndex.Di)
{
return false;
}
// Set the structured operands
// IDIV has only one operand