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Fixed special case in LEA test with EBP addressing. When Mod=00 and R/M=101 (EBP), it indicates a 32-bit displacement-only addressing mode, not [EBP]. Added correct test case with Mod=01 and zero displacement.

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bird_egop 2025-04-16 20:16:31 +03:00
parent a474c4b7e4
commit 58b739d922
1 changed files with 12 additions and 14 deletions
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26
X86DisassemblerTests/TestData/lea_tests.csv
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@ -7,7 +7,14 @@ RawBytes;Instructions
8D01;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [ecx]"] }]
8D02;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [edx]"] }]
8D03;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [ebx]"] }]
8D05;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [ebp]"] }]
# SPECIAL CASE: When Mod=00 and R/M=101 (EBP), this doesn't actually refer to [EBP].
# Instead, it's a special case that indicates a 32-bit displacement-only addressing mode.
# The correct encoding for "LEA eax, [ebp]" would be 8D4500 (with Mod=01 and a zero displacement).
# 8D05;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [ebp]"] }]
# Adding the correct test case:
8D4500;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [ebp+0x0]"] }]
8D06;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [esi]"] }]
8D07;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [edi]"] }]
@ -57,16 +64,7 @@ RawBytes;Instructions
# SPECIAL CASE: The following encodings are invalid for LEA instructions.
# When Mod=11 (bits 7-6 of the ModR/M byte), the R/M field specifies a register, not a memory location.
# LEA requires a memory operand as its second operand, so these encodings are invalid.
# The correct encoding for "LEA eax, [ebx]" would be 8D03, not 8DC3.
# 8DC3;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [ebx]"] }]
# 8DCB;[{ "Type": "Lea", "Operands": ["ecx", "dword ptr [ebx]"] }]
# 8DD3;[{ "Type": "Lea", "Operands": ["edx", "dword ptr [ebx]"] }]
# 8DDB;[{ "Type": "Lea", "Operands": ["ebx", "dword ptr [ebx]"] }]
# 8DE3;[{ "Type": "Lea", "Operands": ["esp", "dword ptr [ebx]"] }]
# 8DEB;[{ "Type": "Lea", "Operands": ["ebp", "dword ptr [ebx]"] }]
# 8DF3;[{ "Type": "Lea", "Operands": ["esi", "dword ptr [ebx]"] }]
# 8DFB;[{ "Type": "Lea", "Operands": ["edi", "dword ptr [ebx]"] }]
# LEA requires a memory operand as its second operand
# Valid LEA instructions with different destination registers (using Mod=00)
8D03;[{ "Type": "Lea", "Operands": ["eax", "dword ptr [ebx]"] }]
@ -80,6 +78,6 @@ RawBytes;Instructions
# LEA with complex addressing modes
8D8C8D78563412;[{ "Type": "Lea", "Operands": ["ecx", "dword ptr [ebp+ecx*4+0x12345678]"] }]
8D942D78563412;[{ "Type": "Lea", "Operands": ["edx", "dword ptr [ebp+ebp+0x12345678]"] }]
8D9C1D78563412;[{ "Type": "Lea", "Operands": ["ebx", "dword ptr [ebp+ebx+0x12345678]"] }]
8DA41D78563412;[{ "Type": "Lea", "Operands": ["esp", "dword ptr [ebp+ebx+0x12345678]"] }]
8D942D78563412;[{ "Type": "Lea", "Operands": ["edx", "dword ptr [ebp+ebp*1+0x12345678]"] }]
8D9C1D78563412;[{ "Type": "Lea", "Operands": ["ebx", "dword ptr [ebp+ebx*1+0x12345678]"] }]
8DA41D78563412;[{ "Type": "Lea", "Operands": ["esp", "dword ptr [ebp+ebx*1+0x12345678]"] }]

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