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LibDebug: Add ProcessInspector base class

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ProcessInspector is an abstract base class for an object that can
inspect the address space of a process.

Concrete sub classes need to implement methods for peeking & poking
memory and walking the loaded libraries.

It is currently only implemented by DebugSession.
This commit is contained in:
Itamar 2021-11-19 16:13:07 +02:00 • committed by Linus Groh
parent 38ddf301f6
commit 7950f5cb51
7 changed files with 173 additions and 118 deletions
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65
Userland/Libraries/LibDebug/DebugSession.h
View file

@ -15,6 +15,7 @@
#include <AK/String.h>
#include <LibC/sys/arch/i386/regs.h>
#include <LibDebug/DebugInfo.h>
#include <LibDebug/ProcessInspector.h>
#include <signal.h>
#include <stdio.h>
#include <sys/ptrace.h>
@ -23,19 +24,23 @@
namespace Debug {
class DebugSession {
class DebugSession : public ProcessInspector {
public:
static OwnPtr<DebugSession> exec_and_attach(String const& command, String source_root = {});
~DebugSession();
virtual ~DebugSession() override;
// ^Debug::ProcessInspector
virtual bool poke(void* address, FlatPtr data) override;
virtual Optional<FlatPtr> peek(void* address) const override;
virtual PtraceRegisters get_registers() const override;
virtual void set_registers(PtraceRegisters const&) override;
virtual void for_each_loaded_library(Function<IterationDecision(LoadedLibrary const&)>) const override;
int pid() const { return m_debuggee_pid; }
bool poke(u32* address, u32 data);
Optional<u32> peek(u32* address) const;
bool poke_debug(u32 register_index, u32 data);
Optional<u32> peek_debug(u32 register_index) const;
bool poke_debug(u32 register_index, FlatPtr data);
Optional<FlatPtr> peek_debug(u32 register_index) const;
enum class BreakPointState {
Enabled,
@ -44,7 +49,7 @@ public:
struct BreakPoint {
void* address { nullptr };
u32 original_first_word { 0 };
FlatPtr original_first_word { 0 };
BreakPointState state { BreakPointState::Disabled };
};
@ -88,9 +93,6 @@ public:
}
}
PtraceRegisters get_registers() const;
void set_registers(PtraceRegisters const&);
enum class ContinueType {
FreeRun,
Syscall,
@ -126,45 +128,6 @@ public:
Exited,
};
struct LoadedLibrary {
String name;
NonnullRefPtr<MappedFile> file;
NonnullOwnPtr<ELF::Image> image;
NonnullOwnPtr<DebugInfo> debug_info;
FlatPtr base_address;
LoadedLibrary(String const& name, NonnullRefPtr<MappedFile> file, NonnullOwnPtr<ELF::Image> image, NonnullOwnPtr<DebugInfo>&& debug_info, FlatPtr base_address)
: name(name)
, file(move(file))
, image(move(image))
, debug_info(move(debug_info))
, base_address(base_address)
{
}
};
template<typename Func>
void for_each_loaded_library(Func f) const
{
for (const auto& lib_name : m_loaded_libraries.keys()) {
const auto& lib = *m_loaded_libraries.get(lib_name).value();
if (f(lib) == IterationDecision::Break)
break;
}
}
const LoadedLibrary* library_at(FlatPtr address) const;
struct SymbolicationResult {
String library_name;
String symbol;
};
Optional<SymbolicationResult> symbolicate(FlatPtr address) const;
Optional<DebugInfo::SourcePositionAndAddress> get_address_from_source_position(String const& file, size_t line) const;
Optional<DebugInfo::SourcePosition> get_source_position(FlatPtr address) const;
private:
explicit DebugSession(pid_t, String source_root);
@ -180,7 +143,7 @@ private:
HashMap<void*, BreakPoint> m_breakpoints;
HashMap<void*, WatchPoint> m_watchpoints;
// Maps from base address to loaded library
// Maps from library name to LoadedLibrary obect
HashMap<String, NonnullOwnPtr<LoadedLibrary>> m_loaded_libraries;
};