Modifed debug target type representation

src/debug_target.rs

@@ -1,8 +1,8 @@
+use crate::syscall_info::{syscall_info, SyscallInfo, SyscallInfoError};
 use either::{Either, Left, Right};
 use nix::libc::user_regs_struct;
 use nix::sys::wait::{waitid, Id, WaitPidFlag, WaitStatus};
 use nix::unistd::Pid;
-use crate::syscall_info::{SyscallInfo, SyscallInfoError, syscall_info};
 
 #[derive(thiserror::Error, Debug)]
 #[error("Error when calling ptrace: {0}")]
@@ -24,85 +24,82 @@ pub enum DebugError {
 	UnexpectedWaitStatus(nix::sys::wait::WaitStatus),
 }
 
-pub struct DebugTarget<S: DebugState> {
-	state: S,
+pub struct StoppedTarget {
+	pub pid: Pid,
 }
 
-pub trait DebugState {
-	#[allow(dead_code)]
-	fn pid(&self) -> Pid;
-}
-
-pub struct Stopped {
-	pid: Pid,
-}
-
-impl DebugState for Stopped {
-	fn pid(&self) -> Pid { self.pid }
-}
 
 #[allow(dead_code)]
-impl DebugTarget<Stopped> {
+impl StoppedTarget {
+	fn to_running(self) -> RunningTarget {
+		RunningTarget { pid: self.pid }
+	}
+
 	pub fn new(pid: Pid) -> Result<Self, DebugError> {
 		waitid(Id::Pid(pid), WaitPidFlag::WSTOPPED).map_err(WaitError)?;
 		// Needed for waiting on syscalls and apparently also for getting syscall info (can not get it to work without this)
 		nix::sys::ptrace::setoptions(pid, nix::sys::ptrace::Options::PTRACE_O_TRACESYSGOOD).map_err(PTraceError)?;
-		Ok(DebugTarget { state: Stopped { pid } })
+		Ok(Self { pid })
 	}
 
-	pub fn cont(self) -> Result<DebugTarget<Running>, PTraceError> {
-		nix::sys::ptrace::cont(self.state.pid, None).map_err(PTraceError)?;
-		Ok(DebugTarget { state: Running { pid: self.state.pid } })
+	pub fn cont(self) -> Result<RunningTarget, PTraceError> {
+		nix::sys::ptrace::cont(self.pid, None).map_err(PTraceError)?;
+		Ok(self.to_running())
 	}
 
-	pub fn stepi(self) -> Result<DebugTarget<Running>, PTraceError> {
-		nix::sys::ptrace::step(self.state.pid, None).map_err(PTraceError)?;
-		Ok(DebugTarget { state: Running { pid: self.state.pid } })
+	pub fn stepi(self) -> Result<RunningTarget, PTraceError> {
+		nix::sys::ptrace::step(self.pid, None).map_err(PTraceError)?;
+		Ok(self.to_running())
 	}
 
-	pub fn cont_syscall(self) -> Result<DebugTarget<Running>, PTraceError> {
-		nix::sys::ptrace::syscall(self.state.pid, None).map_err(PTraceError)?;
-		Ok(DebugTarget { state: Running { pid: self.state.pid } })
+	pub fn cont_syscall(self) -> Result<RunningTarget, PTraceError> {
+		nix::sys::ptrace::syscall(self.pid, None).map_err(PTraceError)?;
+		Ok(self.to_running())
 	}
 
 	pub fn get_registers(&self) -> Result<user_regs_struct, PTraceError> {
-		Ok(nix::sys::ptrace::getregs(self.state.pid)?)
+		Ok(nix::sys::ptrace::getregs(self.pid)?)
 	}
 
 	pub fn get_syscall_info(&self) -> Result<SyscallInfo, SyscallInfoError> {
-		Ok(syscall_info(self.state.pid.as_raw())?)
+		Ok(syscall_info(self.pid.as_raw())?)
 	}
 }
 
-pub struct Running {
-	pid: Pid,
-}
-
-impl DebugState for Running {
-	fn pid(&self) -> Pid { self.pid }
+pub struct RunningTarget {
+	pub pid: Pid,
 }
 
 #[allow(dead_code)]
-impl DebugTarget<Running> {
-	pub fn wait_for_something(self) -> Result<Either<DebugTarget<Stopped>, i32>, DebugError> {
-		match waitid(Id::Pid(self.state.pid), WaitPidFlag::WSTOPPED | WaitPidFlag::WEXITED).map_err(WaitError)? {
-			WaitStatus::Exited(_pid, exit_code) => Ok(Right(exit_code)),
-			WaitStatus::PtraceEvent(..) | WaitStatus::PtraceSyscall(..) => Ok(Left(DebugTarget { state: Stopped { pid: self.state.pid } })),
+impl RunningTarget {
+	fn to_stopped(self) -> StoppedTarget {
+		StoppedTarget { pid: self.pid }
+	}
+
+	pub fn wait_for_something(self) -> Result<Either<StoppedTarget, ExitedTarget>, DebugError> {
+		match waitid(Id::Pid(self.pid), WaitPidFlag::WSTOPPED | WaitPidFlag::WEXITED).map_err(WaitError)? {
+			WaitStatus::Exited(_pid, exit_code) => Ok(Right(ExitedTarget { exit_code, was_pid: self.pid })),
+			WaitStatus::PtraceEvent(..) | WaitStatus::PtraceSyscall(..) => Ok(Left(self.to_stopped())),
 			status => Err(DebugError::UnexpectedWaitStatus(status)),
 		}
 	}
 
-	pub fn wait_for_syscall(self) -> Result<DebugTarget<Stopped>, DebugError> {
-		match waitid(Id::Pid(self.state.pid), WaitPidFlag::WSTOPPED).map_err(WaitError)? {
-			WaitStatus::PtraceSyscall(..) => Ok(DebugTarget { state: Stopped { pid: self.state.pid } }),
+	pub fn wait_for_syscall(self) -> Result<StoppedTarget, DebugError> {
+		match waitid(Id::Pid(self.pid), WaitPidFlag::WSTOPPED).map_err(WaitError)? {
+			WaitStatus::PtraceSyscall(..) => Ok(self.to_stopped()),
 			status => Err(DebugError::UnexpectedWaitStatus(status)),
 		}
 	}
 
-	pub fn wait_for_exit(self) -> Result<i32, DebugError> {
-		match waitid(Id::Pid(self.state.pid), WaitPidFlag::WEXITED).map_err(WaitError)? {
-			WaitStatus::Exited(_pid, exit_code) => Ok(exit_code),
+	pub fn wait_for_exit(self) -> Result<ExitedTarget, DebugError> {
+		match waitid(Id::Pid(self.pid), WaitPidFlag::WEXITED).map_err(WaitError)? {
+			WaitStatus::Exited(_pid, exit_code) => Ok(ExitedTarget { exit_code, was_pid: self.pid }),
 			status => Err(DebugError::UnexpectedWaitStatus(status))
 		}
 	}
 }
+
+pub struct ExitedTarget {
+	pub exit_code: i32,
+	pub was_pid: Pid,
+}

src/main.rs

@@ -3,7 +3,7 @@ mod debug_target;
 mod syscall_info;
 mod syscall_names;
 
-use crate::debug_target::{DebugTarget, Stopped};
+use crate::debug_target::{ExitedTarget, StoppedTarget};
 use color_eyre::eyre::eyre;
 use either::Either;
 use nix::libc::user_regs_struct;
@@ -14,7 +14,7 @@ use nix::unistd::{fork, ForkResult, Pid};
 use std::ffi::{c_long, c_void, CString};
 
 #[allow(dead_code)]
-fn single_step_all(mut target: DebugTarget<Stopped>) -> color_eyre::Result<()> {
+fn single_step_all(mut target: StoppedTarget) -> color_eyre::Result<()> {
 	let mut instruction_number = 0;
 	loop {
 		instruction_number += 1;
@@ -22,7 +22,7 @@ fn single_step_all(mut target: DebugTarget<Stopped>) -> color_eyre::Result<()> {
 		println!("🔎 [==> {}] rip= {:#016x}, rax = 0x{rax:x} ({rax})", instruction_number, regs.rip, rax = regs.rax);
 		match target.stepi()?.wait_for_something()? {
 			Either::Left(t) => target = t,
-			Either::Right(exit_code) => {
+			Either::Right(ExitedTarget { exit_code, was_pid: _was_pid }) => {
 				println!("👋 Child exited with code {exit_code}");
 				return Ok(());
 			}
@@ -31,14 +31,14 @@ fn single_step_all(mut target: DebugTarget<Stopped>) -> color_eyre::Result<()> {
 }
 
 #[allow(dead_code)]
-fn strace(mut target: DebugTarget<Stopped>) -> color_eyre::Result<()> {
+fn strace(mut target: StoppedTarget) -> color_eyre::Result<()> {
 	loop {
 		match target.cont_syscall()?.wait_for_something()? {
 			Either::Left(t) => {
 				println!("{:?}", t.get_syscall_info());
 				target = t;
 			}
-			Either::Right(exit_code) => {
+			Either::Right(ExitedTarget { exit_code, was_pid: _was_pid }) => {
 				println!("👋 Child exited with code {exit_code}");
 				return Ok(());
 			}
@@ -100,16 +100,17 @@ fn breakpoint_fun(child_pid: Pid) -> color_eyre::Result<()> {
 
 fn main() -> color_eyre::Result<()> {
 	color_eyre::install()?;
-	let child_exec_path = CString::new(env!("C_PROG_PATH"))?;
+	let child_exec_path = CString::new(env!("ASM_PROG_PATH"))?;
 
 	match unsafe { fork() } {
 		Ok(ForkResult::Child) => child::starti(child_exec_path),
 		Ok(ForkResult::Parent { child: child_pid }) => {
 			println!("✔️ Created child {child_pid}");
 
-			let target = DebugTarget::new(child_pid)?;
+			let target = StoppedTarget::new(child_pid)?;
 			println!("✔️ Child ready!");
 
+
 			// println!("🔎 rip: {:#x}", target.get_registers()?.rip);
 			//
 			//