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https://github.com/FEX-Emu/FEX.git
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56 lines
877 B
NASM
56 lines
877 B
NASM
%ifdef CONFIG
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{
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"Match": "All",
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"RegData": {
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"RAX": "0",
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"RCX": "0",
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"RDI": "0xE8000100"
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},
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"MemoryRegions": {
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"0x100000000": "4096"
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}
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}
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%endif
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; Starting address to store to
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mov rdi, 0xe8000000
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; How many elements we want to store
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; Additional just in case STOS continues past for some reason
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mov rcx, 0x100
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; Data we want to store
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mov rax, 0xDEADBEEFBAD0DAD1
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; Direction to increment (Increment when cleared)
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cld
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; First fill the area with garbage without using STOS
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mov rdx, 0
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loop_header:
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mov [rdi + rdx * 8], rax
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add rdx, 1
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cmp rdx, rcx
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jne loop_header
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; Now use STOS to fill the data with zero
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mov rax, 0x0
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mov rcx, 0x20
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rep stosq
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; Now read the data back and ensure it is zero
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mov r14, 0xe8000000
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mov r13, 0x20
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mov r12, 0
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mov r11, 0
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loop_header2:
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add r11, [r14 + r12 * 8]
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add r12, 1
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cmp r12, r13
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jne loop_header2
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hlt
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