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42 lines
1.2 KiB
NASM
42 lines
1.2 KiB
NASM
%ifdef CONFIG
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{
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"RegData": {
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"RAX": "0x4142434445464748",
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"RBX": "0x5152535455565758",
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"RCX": "0x5152535455565758"
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},
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"MemoryRegions": {
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"0x7FFFF000": "4096"
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},
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"MemoryData": {
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"0x7FFFF000": "48 47 46 45 44 43 42 41"
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}
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}
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%endif
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; Tests to ensure that 64-bit displacement encoding works correctly without being RIP relative.
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; x86-64 has two displacement encodings, one is RIP relative, one is 32-bit (signed) displacement only.
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; modrm.mod = 0b00 && modrm.rm = 0b101: Means no SIB, but address mode is RIP + disp32.
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; modrm.mod = 0b00 && modrm.rm = 0b100: Means SIB, but address mode is disp32.
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; - if SIB.base = 0b101 && SIB.index = 0b100. Which means no registers for base and index.
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; Test disp32 by mapping a page at the limit of 2GB and read data from it. Also store and load.
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; If we were accidentally using RIP relative, then it would be 2GB + <low test base address>, which won't be mapped.
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; Test disp32 load.
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mov rax, [abs 0x7FFF_F000]
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mov rbx, 0x5152535455565758
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; LEA with disp32.
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lea rcx, [abs 0x7FFF_FFF8]
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; Test store with disp32 store.
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mov [abs 0x7FFF_FFF8], rbx
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; Load back with the LEA to ensure it's correct.
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mov rcx, [rcx]
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hlt
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