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Fixed special case in INC/DEC tests 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 cases with Mod=01 and zero displacement.

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bird_egop 2025-04-16 20:18:14 +03:00
parent 58b739d922
commit 41a4e5884d
1 changed files with 13 additions and 4 deletions
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17
X86DisassemblerTests/TestData/misc_tests.csv
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@ -34,10 +34,19 @@ F4;[{ "Type": "Hlt", "Operands": [] }]
# LOCK prefix
F0;[{ "Type": "Lock", "Operands": [] }]
F0FE05;[{ "Type": "Inc", "Operands": ["byte ptr [ebp]"], "Prefix": "Lock" }]
F0FF05;[{ "Type": "Inc", "Operands": ["dword ptr [ebp]"], "Prefix": "Lock" }]
F0FE0D;[{ "Type": "Dec", "Operands": ["byte ptr [ebp]"], "Prefix": "Lock" }]
F0FF0D;[{ "Type": "Dec", "Operands": ["dword ptr [ebp]"], "Prefix": "Lock" }]
# 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 instructions with [ebp] would use Mod=01 and a zero displacement.
# F0FE05;[{ "Type": "Inc", "Operands": ["byte ptr [ebp]"], "Prefix": "Lock" }]
# F0FF05;[{ "Type": "Inc", "Operands": ["dword ptr [ebp]"], "Prefix": "Lock" }]
# F0FE0D;[{ "Type": "Dec", "Operands": ["byte ptr [ebp]"], "Prefix": "Lock" }]
# F0FF0D;[{ "Type": "Dec", "Operands": ["dword ptr [ebp]"], "Prefix": "Lock" }]
# Adding the correct test cases:
F0FE4500;[{ "Type": "Inc", "Operands": ["byte ptr [ebp+0x0]"], "Prefix": "Lock" }]
F0FF4500;[{ "Type": "Inc", "Operands": ["dword ptr [ebp+0x0]"], "Prefix": "Lock" }]
F0FE4D00;[{ "Type": "Dec", "Operands": ["byte ptr [ebp+0x0]"], "Prefix": "Lock" }]
F0FF4D00;[{ "Type": "Dec", "Operands": ["dword ptr [ebp+0x0]"], "Prefix": "Lock" }]
# IN - Input from Port
E410;[{ "Type": "In", "Operands": ["al", "0x10"] }]

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