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|
use super::X86SegmentRegs;
use super::X87FpuInternalRegs;
use super::F80;
use core::convert::TryInto;
use gdbstub::arch::Registers;
/// 32-bit x86 core registers (+ SSE extensions).
///
/// Source: <https://github.com/bminor/binutils-gdb/blob/master/gdb/features/i386/32bit-core.xml>
/// Additionally: <https://github.com/bminor/binutils-gdb/blob/master/gdb/features/i386/32bit-sse.xml>
#[derive(Debug, Default, Clone, PartialEq, Eq)]
pub struct X86CoreRegs {
/// Accumulator
pub eax: u32,
/// Count register
pub ecx: u32,
/// Data register
pub edx: u32,
/// Base register
pub ebx: u32,
/// Stack pointer
pub esp: u32,
/// Base pointer
pub ebp: u32,
/// Source index
pub esi: u32,
/// Destination index
pub edi: u32,
/// Instruction pointer
pub eip: u32,
/// Status register
pub eflags: u32,
/// Segment registers: CS, SS, DS, ES, FS, GS
pub segments: X86SegmentRegs,
/// FPU registers: ST0 through ST7
pub st: [F80; 8],
/// FPU internal registers
pub fpu: X87FpuInternalRegs,
/// SIMD Registers: XMM0 through XMM7
pub xmm: [u128; 8],
/// SSE Status/Control Register
pub mxcsr: u32,
}
impl Registers for X86CoreRegs {
type ProgramCounter = u32;
fn pc(&self) -> Self::ProgramCounter {
self.eip
}
fn gdb_serialize(&self, mut write_byte: impl FnMut(Option<u8>)) {
macro_rules! write_bytes {
($bytes:expr) => {
for b in $bytes {
write_byte(Some(*b))
}
};
}
macro_rules! write_regs {
($($reg:ident),*) => {
$(
write_bytes!(&self.$reg.to_le_bytes());
)*
}
}
write_regs!(eax, ecx, edx, ebx, esp, ebp, esi, edi, eip, eflags);
self.segments.gdb_serialize(&mut write_byte);
// st0 to st7
for st_reg in &self.st {
write_bytes!(st_reg);
}
self.fpu.gdb_serialize(&mut write_byte);
// xmm0 to xmm15
for xmm_reg in &self.xmm {
write_bytes!(&xmm_reg.to_le_bytes());
}
// mxcsr
write_bytes!(&self.mxcsr.to_le_bytes());
// padding
(0..4).for_each(|_| write_byte(None))
}
fn gdb_deserialize(&mut self, bytes: &[u8]) -> Result<(), ()> {
if bytes.len() < 0x138 {
return Err(());
}
macro_rules! parse_regs {
($($reg:ident),*) => {
let mut regs = bytes[0..0x28]
.chunks_exact(4)
.map(|x| u32::from_le_bytes(x.try_into().unwrap()));
$(
self.$reg = regs.next().ok_or(())?;
)*
}
}
parse_regs!(eax, ecx, edx, ebx, esp, ebp, esi, edi, eip, eflags);
self.segments.gdb_deserialize(&bytes[0x28..0x40])?;
let mut regs = bytes[0x40..0x90].chunks_exact(10).map(TryInto::try_into);
for reg in self.st.iter_mut() {
*reg = regs.next().ok_or(())?.map_err(|_| ())?;
}
self.fpu.gdb_deserialize(&bytes[0x90..0xb0])?;
let mut regs = bytes[0xb0..0x130]
.chunks_exact(0x10)
.map(|x| u128::from_le_bytes(x.try_into().unwrap()));
for reg in self.xmm.iter_mut() {
*reg = regs.next().ok_or(())?;
}
self.mxcsr = u32::from_le_bytes(bytes[0x130..0x134].try_into().unwrap());
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn x86_core_round_trip() {
let regs_before = X86CoreRegs {
eax: 1,
ecx: 2,
edx: 3,
ebx: 4,
esp: 5,
ebp: 6,
esi: 7,
edi: 8,
eip: 9,
eflags: 10,
segments: X86SegmentRegs {
cs: 11,
ss: 12,
ds: 13,
es: 14,
fs: 15,
gs: 16,
},
st: Default::default(),
fpu: X87FpuInternalRegs {
fctrl: 17,
fstat: 18,
ftag: 19,
fiseg: 20,
fioff: 21,
foseg: 22,
fooff: 23,
fop: 24,
},
xmm: Default::default(),
mxcsr: 99,
};
let mut data = vec![];
regs_before.gdb_serialize(|x| {
data.push(x.unwrap_or(b'x'));
});
let mut regs_after = X86CoreRegs::default();
regs_after.gdb_deserialize(&data).unwrap();
assert_eq!(regs_before, regs_after);
}
}
|
