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hypervisor: x86: use a macro to generate emulate function for movs

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No functional change.

Signed-off-by: Wei Liu <liuwe@microsoft.com>
This commit is contained in:
Wei Liu 2023-01-26 16:24:27 +00:00 committed by Liu Wei
parent 8e682bcb00
commit 1bfa07f48e
1 changed files with 71 additions and 65 deletions
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136
hypervisor/src/arch/x86/emulator/instructions/movs.rs
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@ -15,73 +15,79 @@ use crate::arch::x86::emulator::instructions::*;
use crate::arch::x86::regs::DF;
use crate::arch::x86::Exception;
macro_rules! movs {
($bound:ty) => {
fn emulate(
&self,
insn: &Instruction,
state: &mut T,
platform: &mut dyn PlatformEmulator<CpuState = T>,
) -> Result<(), EmulationError<Exception>> {
let mut count: u64 = if insn.has_rep_prefix() {
state
.read_reg(Register::ECX)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?
} else {
1
};
let mut rsi = state
.read_reg(Register::RSI)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
let mut rdi = state
.read_reg(Register::RDI)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
let df = (state.flags() & DF) != 0;
let len = std::mem::size_of::<$bound>();
while count > 0 {
let mut memory: [u8; 4] = [0; 4];
let src = state
.linearize(Register::DS, rsi, false)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
let dst = state
.linearize(Register::ES, rdi, true)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
platform
.read_memory(src, &mut memory[0..len])
.map_err(EmulationError::PlatformEmulationError)?;
platform
.write_memory(dst, &memory[0..len])
.map_err(EmulationError::PlatformEmulationError)?;
if df {
rsi = rsi.wrapping_sub(len as u64);
rdi = rdi.wrapping_sub(len as u64);
} else {
rsi = rsi.wrapping_add(len as u64);
rdi = rdi.wrapping_add(len as u64);
}
count -= 1;
}
state
.write_reg(Register::RSI, rsi)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
state
.write_reg(Register::RDI, rdi)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
if insn.has_rep_prefix() {
state
.write_reg(Register::ECX, 0)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
}
Ok(())
}
};
}
pub struct Movsd_m32_m32;
impl<T: CpuStateManager> InstructionHandler<T> for Movsd_m32_m32 {
fn emulate(
&self,
insn: &Instruction,
state: &mut T,
platform: &mut dyn PlatformEmulator<CpuState = T>,
) -> Result<(), EmulationError<Exception>> {
let mut count: u64 = if insn.has_rep_prefix() {
state
.read_reg(Register::ECX)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?
} else {
1
};
let mut rsi = state
.read_reg(Register::RSI)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
let mut rdi = state
.read_reg(Register::RDI)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
let df = (state.flags() & DF) != 0;
let len = std::mem::size_of::<u32>();
while count > 0 {
let mut memory: [u8; 4] = [0; 4];
let src = state
.linearize(Register::DS, rsi, false)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
let dst = state
.linearize(Register::ES, rdi, true)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
platform
.read_memory(src, &mut memory[0..len])
.map_err(EmulationError::PlatformEmulationError)?;
platform
.write_memory(dst, &memory[0..len])
.map_err(EmulationError::PlatformEmulationError)?;
if df {
rsi = rsi.wrapping_sub(len as u64);
rdi = rdi.wrapping_sub(len as u64);
} else {
rsi = rsi.wrapping_add(len as u64);
rdi = rdi.wrapping_add(len as u64);
}
count -= 1;
}
state
.write_reg(Register::RSI, rsi)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
state
.write_reg(Register::RDI, rdi)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
if insn.has_rep_prefix() {
state
.write_reg(Register::ECX, 0)
.map_err(|e| EmulationError::InvalidOperand(anyhow!(e)))?;
}
Ok(())
}
movs!(u32);
}
#[cfg(test)]