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Simplified jump instruction handlers by using consistent decoder methods and improving code organization

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bird_egop
2025-04-14 00:09:44 +03:00
parent 5daab494e1
commit 38770de005
3 changed files with 23 additions and 55 deletions
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24
X86Disassembler/X86/Handlers/Jump/ConditionalJumpHandler.cs
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@ -46,30 +46,18 @@ public class ConditionalJumpHandler : InstructionHandler
int index = opcode - 0x70;
instruction.Mnemonic = Mnemonics[index];
// Get the current position in the code buffer
int position = Decoder.GetPosition();
if (position >= Length)
// Check if we can read the offset byte
if (!Decoder.CanReadByte())
{
return false;
}
// Read the relative offset
sbyte offset = (sbyte)CodeBuffer[position];
// According to x86 architecture, the jump offset is relative to the instruction following the jump
// For a conditional jump, the instruction is 2 bytes: opcode (1 byte) + offset (1 byte)
// Calculate the target address:
// 1. Start with the current position (where the offset byte is)
// 2. Add 1 to account for the size of the offset byte itself
// 3. Add the offset value
// Read the offset and calculate target address
int position = Decoder.GetPosition();
sbyte offset = (sbyte)Decoder.ReadByte();
int targetAddress = position + 1 + offset;
// Move the decoder position past the offset byte
Decoder.SetPosition(position + 1);
// Set the operands to the calculated target address
// Format the target address as a hexadecimal value
instruction.Operands = $"0x{targetAddress:X8}";
return true;