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Paris Oplopoios
f7d76255ad
Signed-off-by: Paris Oplopoios <21157395+OFFTKP@users.noreply.github.com>
69 lines
949 B
NASM
69 lines
949 B
NASM
%ifdef CONFIG
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{
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"RegData": {
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"R12": "0x55",
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"R13": "0x890",
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"R14": "0x55"
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}
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}
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%endif
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mov rsi, 0xe0000080
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mov rsp, 0xe0001000
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; Zero shift amount
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xor ecx, ecx
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; Zero all flags
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xor eax, eax
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push rax
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popfq
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mov r8b, 255
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mov r10b, 127
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mov r11b, 1
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add r8b, r11b ; Sets CF, ZF, PF, AF, zeroes OF, SF
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; Shift by zero, flags should be unaffected
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; This tests that we didn't optimize away the flag calculations of the add
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shl rax, cl
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; Ensure we can't predict the next block
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lea rdi, [rel .next]
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mov [rsi - 8], rdi
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jmp [rsi - 8]
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.next:
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pushfq
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pop r12
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; Mask with flags we care about
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and r12, 0x8d5
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add r10b, r11b ; Sets OF, SF, AF, zeroes ZF, CF, PF
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shr rax, cl
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lea rdi, [rel .next2]
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mov [rsi - 8], rdi
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jmp [rsi - 8]
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.next2:
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pushfq
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pop r13
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and r13, 0x8d5
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mov r8b, 255
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add r8b, r11b ; Sets CF, ZF, PF, AF, zeroes OF, SF
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sar rax, cl
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lea rdi, [rel .next3]
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mov [rsi - 8], rdi
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jmp [rsi - 8]
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.next3:
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pushfq
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pop r14
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and r14, 0x8d5
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hlt |