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Inline breakpoint support in core.

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This commit is contained in:
losfair 2019-10-11 21:04:53 +08:00
parent 2e1fb7abca
commit db59127f71
3 changed files with 148 additions and 22 deletions
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72
lib/runtime-core/src/backend.rs
View File

@ -70,6 +70,78 @@ impl std::str::FromStr for Backend {
}
}
#[derive(Copy, Clone, Debug)]
pub enum Architecture {
X64,
Aarch64,
}
#[repr(u8)]
#[derive(Copy, Clone, Debug)]
pub enum InlineBreakpointType {
Trace,
Middleware,
Unknown,
}
#[derive(Clone, Debug)]
pub struct InlineBreakpoint {
pub size: usize,
pub ty: InlineBreakpointType,
}
pub fn get_inline_breakpoint_size(arch: Architecture, backend: Backend) -> Option<usize> {
match (arch, backend) {
(Architecture::X64, Backend::Singlepass) => Some(7),
(Architecture::Aarch64, Backend::Singlepass) => Some(12),
_ => None
}
}
pub fn read_inline_breakpoint(arch: Architecture, backend: Backend, code: &[u8]) -> Option<InlineBreakpoint> {
match arch {
Architecture::X64 => match backend {
Backend::Singlepass => {
if code.len() < 7 {
None
} else if &code[..6] == &[0x0f, 0x0b, 0x0f, 0xb9, 0xcd, 0xff] {
// ud2 ud (int 0xff) code
Some(InlineBreakpoint {
size: 7,
ty: match code[6] {
0 => InlineBreakpointType::Trace,
1 => InlineBreakpointType::Middleware,
_ => InlineBreakpointType::Unknown,
},
})
} else {
None
}
}
_ => None
},
Architecture::Aarch64 => match backend {
Backend::Singlepass => {
if code.len() < 12 {
None
} else if &code[..8] == &[0, 0, 0, 0, 0xff, 0xff, 0xff, 0xff] {
Some(InlineBreakpoint {
size: 12,
ty: match code[8] {
0 => InlineBreakpointType::Trace,
1 => InlineBreakpointType::Middleware,
_ => InlineBreakpointType::Unknown,
}
})
} else {
None
}
},
_ => None,
}
}
}
#[cfg(test)]
mod backend_test {
use super::*;

96
lib/runtime-core/src/fault.rs
View File

@ -244,9 +244,59 @@ extern "C" fn signal_trap_handler(
siginfo: *mut siginfo_t,
ucontext: *mut c_void,
) {
use crate::backend::{Architecture, InlineBreakpointType, get_inline_breakpoint_size, read_inline_breakpoint};
#[cfg(target_arch = "x86_64")]
static ARCH: Architecture = Architecture::X64;
#[cfg(target_arch = "aarch64")]
static ARCH: Architecture = Architecture::Aarch64;
unsafe {
let fault = get_fault_info(siginfo as _, ucontext);
println!("Fault: {:?}", fault);
let early_return = CURRENT_CODE_VERSIONS.with(|versions| {
let versions = versions.borrow();
for v in versions.iter() {
let magic_size = if let Some(x) = get_inline_breakpoint_size(ARCH, v.backend) {
x
} else {
continue
};
let ip = fault.ip.get();
let end = v.base + v.msm.total_size;
if ip >= v.base && ip < end && ip + magic_size <= end {
if let Some(ib) = read_inline_breakpoint(ARCH, v.backend, unsafe {
std::slice::from_raw_parts(ip as *const u8, magic_size)
}) {
fault.ip.set(ip + magic_size);
match ib.ty {
InlineBreakpointType::Trace => {},
InlineBreakpointType::Middleware => {
let out: Option<Result<(), Box<dyn Any>>> = with_breakpoint_map(|bkpt_map| {
bkpt_map.and_then(|x| x.get(&ip)).map(|x| {
x(BreakpointInfo {
fault: Some(&fault),
})
})
});
if let Some(Ok(())) = out {
} else {
println!("Failed calling middleware: {:?}", out);
}
}
_ => println!("Unknown breakpoint type: {:?}", ib.ty)
}
return true;
}
break;
}
}
false
});
if early_return {
return;
}
let mut unwind_result: Box<dyn Any> = Box::new(());
@ -259,7 +309,7 @@ extern "C" fn signal_trap_handler(
Ok(SIGTRAP) => {
// breakpoint
let out: Option<Result<(), Box<dyn Any>>> = with_breakpoint_map(|bkpt_map| {
bkpt_map.and_then(|x| x.get(&(fault.ip as usize))).map(|x| {
bkpt_map.and_then(|x| x.get(&(fault.ip.get()))).map(|x| {
x(BreakpointInfo {
fault: Some(&fault),
})
@ -293,12 +343,11 @@ extern "C" fn signal_trap_handler(
let es_image = CURRENT_CODE_VERSIONS.with(|versions| {
let versions = versions.borrow();
println!("V = {}", versions.len());
read_stack(
|| versions.iter(),
rsp as usize as *const u64,
fault.known_registers,
Some(fault.ip as usize as u64),
Some(fault.ip.get() as u64),
)
});
@ -307,7 +356,6 @@ extern "C" fn signal_trap_handler(
unwind_result = Box::new(image);
} else {
use colored::*;
println!("F = {}", es_image.frames.len());
if es_image.frames.len() > 0 {
eprintln!(
"\n{}",
@ -374,12 +422,12 @@ unsafe fn install_sighandler() {
#[derive(Debug, Clone)]
pub struct FaultInfo {
pub faulting_addr: *const c_void,
pub ip: *const c_void,
pub ip: &'static Cell<usize>,
pub known_registers: [Option<u64>; 24],
}
#[cfg(all(target_os = "linux", target_arch = "aarch64"))]
pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) -> FaultInfo {
pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *mut c_void) -> FaultInfo {
#[allow(dead_code)]
#[repr(packed)]
struct sigcontext {
@ -411,7 +459,7 @@ pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) ->
let siginfo = siginfo as *const siginfo_t;
let si_addr = (*siginfo).si_addr;
let ucontext = ucontext as *const ucontext;
let ucontext = ucontext as *mut ucontext;
let gregs = &(*ucontext).uc_mcontext.regs;
let mut known_registers: [Option<u64>; 24] = [None; 24];
@ -436,13 +484,13 @@ pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) ->
FaultInfo {
faulting_addr: si_addr as usize as _,
ip: (*ucontext).uc_mcontext.pc as _,
ip: std::mem::transmute::<&mut u64, &'static Cell<usize>>(&mut (*ucontext).uc_mcontext.pc),
known_registers,
}
}
#[cfg(all(target_os = "linux", target_arch = "x86_64"))]
pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) -> FaultInfo {
pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *mut c_void) -> FaultInfo {
use libc::{
_libc_xmmreg, ucontext_t, REG_R10, REG_R11, REG_R12, REG_R13, REG_R14, REG_R15, REG_R8,
REG_R9, REG_RAX, REG_RBP, REG_RBX, REG_RCX, REG_RDI, REG_RDX, REG_RIP, REG_RSI, REG_RSP,
@ -465,9 +513,8 @@ pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) ->
let siginfo = siginfo as *const siginfo_t;
let si_addr = (*siginfo).si_addr;
let ucontext = ucontext as *const ucontext_t;
let gregs = &(*ucontext).uc_mcontext.gregs;
let fpregs = &*(*ucontext).uc_mcontext.fpregs;
let ucontext = ucontext as *mut ucontext_t;
let gregs = &mut (*ucontext).uc_mcontext.gregs;
let mut known_registers: [Option<u64>; 24] = [None; 24];
known_registers[X64Register::GPR(GPR::R15).to_index().0] = Some(gregs[REG_R15 as usize] as _);
@ -488,18 +535,23 @@ pub unsafe fn get_fault_info(siginfo: *const c_void, ucontext: *const c_void) ->
known_registers[X64Register::GPR(GPR::RBP).to_index().0] = Some(gregs[REG_RBP as usize] as _);
known_registers[X64Register::GPR(GPR::RSP).to_index().0] = Some(gregs[REG_RSP as usize] as _);
known_registers[X64Register::XMM(XMM::XMM0).to_index().0] = Some(read_xmm(&fpregs._xmm[0]));
known_registers[X64Register::XMM(XMM::XMM1).to_index().0] = Some(read_xmm(&fpregs._xmm[1]));
known_registers[X64Register::XMM(XMM::XMM2).to_index().0] = Some(read_xmm(&fpregs._xmm[2]));
known_registers[X64Register::XMM(XMM::XMM3).to_index().0] = Some(read_xmm(&fpregs._xmm[3]));
known_registers[X64Register::XMM(XMM::XMM4).to_index().0] = Some(read_xmm(&fpregs._xmm[4]));
known_registers[X64Register::XMM(XMM::XMM5).to_index().0] = Some(read_xmm(&fpregs._xmm[5]));
known_registers[X64Register::XMM(XMM::XMM6).to_index().0] = Some(read_xmm(&fpregs._xmm[6]));
known_registers[X64Register::XMM(XMM::XMM7).to_index().0] = Some(read_xmm(&fpregs._xmm[7]));
// WSL bug
if !(*ucontext).uc_mcontext.fpregs.is_null() {
let fpregs = &*(*ucontext).uc_mcontext.fpregs;
known_registers[X64Register::XMM(XMM::XMM0).to_index().0] = Some(read_xmm(&fpregs._xmm[0]));
known_registers[X64Register::XMM(XMM::XMM1).to_index().0] = Some(read_xmm(&fpregs._xmm[1]));
known_registers[X64Register::XMM(XMM::XMM2).to_index().0] = Some(read_xmm(&fpregs._xmm[2]));
known_registers[X64Register::XMM(XMM::XMM3).to_index().0] = Some(read_xmm(&fpregs._xmm[3]));
known_registers[X64Register::XMM(XMM::XMM4).to_index().0] = Some(read_xmm(&fpregs._xmm[4]));
known_registers[X64Register::XMM(XMM::XMM5).to_index().0] = Some(read_xmm(&fpregs._xmm[5]));
known_registers[X64Register::XMM(XMM::XMM6).to_index().0] = Some(read_xmm(&fpregs._xmm[6]));
known_registers[X64Register::XMM(XMM::XMM7).to_index().0] = Some(read_xmm(&fpregs._xmm[7]));
}
FaultInfo {
faulting_addr: si_addr as usize as _,
ip: gregs[REG_RIP as usize] as _,
ip: std::mem::transmute::<&mut i64, &'static Cell<usize>>(&mut gregs[REG_RIP as usize]),
known_registers,
}
}

2
lib/runtime-core/src/state.rs
View File

@ -1,5 +1,6 @@
use std::collections::BTreeMap;
use std::ops::Bound::{Included, Unbounded};
use crate::backend::Backend;
#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
pub struct RegisterIndex(pub usize);
@ -111,6 +112,7 @@ pub struct CodeVersion {
pub baseline: bool,
pub msm: ModuleStateMap,
pub base: usize,
pub backend: Backend,
}
impl ModuleStateMap {