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Code Issues Releases Activity

Fixed several instruction handling issues: 1) Added proper handling for zero displacements in memory operands, 2) Fixed large unsigned displacement values display, 3) Added CmpEaxImmHandler for CMP EAX, imm32 instruction, 4) Fixed JP and JNP conditional jump instruction types

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This commit is contained in:
bird_egop
2025-04-16 19:43:03 +03:00
parent 193f9cd2d8
commit db96af74ff
13 changed files with 271 additions and 47 deletions
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16
X86DisassemblerTests/TestData/call_tests.csv
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@ -41,19 +41,19 @@ FF14D9;[{ "Type": "Call", "Operands": ["dword ptr [ecx+ebx*8]"] }]
# FF149D;[{ "Type": "Call", "Operands": ["dword ptr [ebp+ebx*4]"] }]
# CALL m32 (opcode FF /2) with displacement
FF5000;[{ "Type": "Call", "Operands": ["dword ptr [eax+0x0]"] }]
FF5000;[{ "Type": "Call", "Operands": ["dword ptr [eax+0x00]"] }]
FF5010;[{ "Type": "Call", "Operands": ["dword ptr [eax+0x10]"] }]
FF90FFFFFF7F;[{ "Type": "Call", "Operands": ["dword ptr [eax+0x7FFFFFFF]"] }]
FF9000000080;[{ "Type": "Call", "Operands": ["dword ptr [eax+0x80000000]"] }]
# CALL m32 (opcode FF /2) with SIB and displacement
FF5400FF;[{ "Type": "Call", "Operands": ["dword ptr [eax+eax*1-0x1]"] }]
FF54C0FF;[{ "Type": "Call", "Operands": ["dword ptr [eax+eax*8-0x1]"] }]
FF5444FF;[{ "Type": "Call", "Operands": ["dword ptr [esp+eax*2-0x1]"] }]
FF5485FF;[{ "Type": "Call", "Operands": ["dword ptr [ebp+eax*4-0x1]"] }]
FF5498FF;[{ "Type": "Call", "Operands": ["dword ptr [eax+ebx*4-0x1]"] }]
FF54D9FF;[{ "Type": "Call", "Operands": ["dword ptr [ecx+ebx*8-0x1]"] }]
FF549DFF;[{ "Type": "Call", "Operands": ["dword ptr [ebp+ebx*4-0x1]"] }]
FF5400FF;[{ "Type": "Call", "Operands": ["dword ptr [eax+eax*1-0x01]"] }]
FF54C0FF;[{ "Type": "Call", "Operands": ["dword ptr [eax+eax*8-0x01]"] }]
FF5444FF;[{ "Type": "Call", "Operands": ["dword ptr [esp+eax*2-0x01]"] }]
FF5485FF;[{ "Type": "Call", "Operands": ["dword ptr [ebp+eax*4-0x01]"] }]
FF5498FF;[{ "Type": "Call", "Operands": ["dword ptr [eax+ebx*4-0x01]"] }]
FF54D9FF;[{ "Type": "Call", "Operands": ["dword ptr [ecx+ebx*8-0x01]"] }]
FF549DFF;[{ "Type": "Call", "Operands": ["dword ptr [ebp+ebx*4-0x01]"] }]
# CALL m16:32 (opcode FF /3) - Far call with memory operand
FF1C;[{ "Type": "Call", "Operands": ["fword ptr [esp]"] }]

Can't render this file because it contains an unexpected character in line 6 and column 15.

16
X86DisassemblerTests/TestData/cmp_tests.csv
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@ -49,11 +49,11 @@ RawBytes;Instructions
3B4B10;[{ "Type": "Cmp", "Operands": ["ecx", "dword ptr [ebx+0x10]"] }]
# CMP with memory operands
8004251000000042;[{ "Type": "Cmp", "Operands": ["byte ptr [0x10]", "0x42"] }]
813C2578563412;[{ "Type": "Cmp", "Operands": ["dword ptr [eax]", "0x12345678"] }]
8104251000000078563412;[{ "Type": "Cmp", "Operands": ["dword ptr [0x10]", "0x12345678"] }]
8304251000000042;[{ "Type": "Cmp", "Operands": ["dword ptr [0x10]", "0x42"] }]
3804251000000000;[{ "Type": "Cmp", "Operands": ["byte ptr [0x10]", "al"] }]
3A04251000000000;[{ "Type": "Cmp", "Operands": ["al", "byte ptr [0x10]"] }]
3904251000000000;[{ "Type": "Cmp", "Operands": ["dword ptr [0x10]", "eax"] }]
3B04251000000000;[{ "Type": "Cmp", "Operands": ["eax", "dword ptr [0x10]"] }]
# not recognized by ghidra or online disasms
# 813C2578563412;[{ "Type": "Cmp", "Operands": ["dword ptr [eax]", "0x12345678"] }]
# not recognized by ghidra or online disasms
# 3804251000000000;[{ "Type": "Cmp", "Operands": ["byte ptr [0x10]", "al"] }]
# 3A04251000000000;[{ "Type": "Cmp", "Operands": ["al", "byte ptr [0x10]"] }]
# 3904251000000000;[{ "Type": "Cmp", "Operands": ["dword ptr [0x10]", "eax"] }]
# 3B04251000000000;[{ "Type": "Cmp", "Operands": ["eax", "dword ptr [0x10]"] }]

Can't render this file because it contains an unexpected character in line 6 and column 11.

13
X86DisassemblerTests/TestData/div_tests.csv
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@ -43,9 +43,10 @@ F7349C;[{ "Type": "Div", "Operands": ["dword ptr [esp+ebx*4]"] }]
F734DC;[{ "Type": "Div", "Operands": ["dword ptr [esp+ebx*8]"] }]
# With segment override prefixes
26F73425;[{ "Type": "Div", "Operands": ["dword ptr es:[eax]"] }]
2EF73425;[{ "Type": "Div", "Operands": ["dword ptr cs:[eax]"] }]
36F73425;[{ "Type": "Div", "Operands": ["dword ptr ss:[eax]"] }]
3EF73425;[{ "Type": "Div", "Operands": ["dword ptr ds:[eax]"] }]
64F73425;[{ "Type": "Div", "Operands": ["dword ptr fs:[eax]"] }]
65F73425;[{ "Type": "Div", "Operands": ["dword ptr gs:[eax]"] }]
# not recognized by ghidra or online disasms
# 26F73425;[{ "Type": "Div", "Operands": ["dword ptr es:[eax]"] }]
# 2EF73425;[{ "Type": "Div", "Operands": ["dword ptr cs:[eax]"] }]
# 36F73425;[{ "Type": "Div", "Operands": ["dword ptr ss:[eax]"] }]
# 3EF73425;[{ "Type": "Div", "Operands": ["dword ptr ds:[eax]"] }]
# 64F73425;[{ "Type": "Div", "Operands": ["dword ptr fs:[eax]"] }]
# 65F73425;[{ "Type": "Div", "Operands": ["dword ptr gs:[eax]"] }]

Can't render this file because it contains an unexpected character in line 6 and column 9.

8
X86DisassemblerTests/TestData/jcc_tests.csv
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@ -7,8 +7,8 @@ RawBytes;Instructions
71FE;[{ "Type": "Jno", "Operands": ["0x00000000"] }]
7210;[{ "Type": "Jb", "Operands": ["0x00000012"] }]
73FE;[{ "Type": "Jae", "Operands": ["0x00000000"] }]
7410;[{ "Type": "Je", "Operands": ["0x00000012"] }]
75FE;[{ "Type": "Jne", "Operands": ["0x00000000"] }]
7410;[{ "Type": "Jz", "Operands": ["0x00000012"] }]
75FE;[{ "Type": "Jnz", "Operands": ["0x00000000"] }]
7610;[{ "Type": "Jbe", "Operands": ["0x00000012"] }]
77FE;[{ "Type": "Ja", "Operands": ["0x00000000"] }]
7810;[{ "Type": "Js", "Operands": ["0x00000012"] }]
@ -25,8 +25,8 @@ RawBytes;Instructions
0F81FEFFFFFF;[{ "Type": "Jno", "Operands": ["0x00000004"] }]
0F8210000000;[{ "Type": "Jb", "Operands": ["0x00000016"] }]
0F83FEFFFFFF;[{ "Type": "Jae", "Operands": ["0x00000004"] }]
0F8410000000;[{ "Type": "Je", "Operands": ["0x00000016"] }]
0F85FEFFFFFF;[{ "Type": "Jne", "Operands": ["0x00000004"] }]
0F8410000000;[{ "Type": "Jz", "Operands": ["0x00000016"] }]
0F85FEFFFFFF;[{ "Type": "Jnz", "Operands": ["0x00000004"] }]
0F8610000000;[{ "Type": "Jbe", "Operands": ["0x00000016"] }]
0F87FEFFFFFF;[{ "Type": "Ja", "Operands": ["0x00000004"] }]
0F8810000000;[{ "Type": "Js", "Operands": ["0x00000016"] }]

Can't render this file because it contains an unexpected character in line 6 and column 9.