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hypervisor: emulator: Use wrapping add for memory offset

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Assume rax is 0xfee003e0 and the displacement is negative 0x60. The effective
address is then 0xfee00380. This is perfectly valid.

Example instruction:
c7 40 a0 00 10 00 00    movl   $0x1000,-0x60(%rax)

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
This commit is contained in:
Philipp Schuster
2023-08-31 14:14:21 +02:00
committed by Rob Bradford
parent 8db85eca1f
commit 556bda74a0
1 changed files with 1 additions and 1 deletions
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hypervisor/src/arch/x86/emulator/instructions/mod.rs
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@@ -124,7 +124,7 @@ fn memory_operand_address<T: CpuStateManager>(
address += index; address += index;
} }
address += insn.memory_displacement64(); address = address.wrapping_add(insn.memory_displacement64());
// Translate to a linear address. // Translate to a linear address.
state.linearize(insn.memory_segment(), address, write) state.linearize(insn.memory_segment(), address, write)