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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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92
Userland/Libraries/LibDebug/DebugSession.cpp
View file

@ -44,6 +44,15 @@ DebugSession::~DebugSession()
}
}
void DebugSession::for_each_loaded_library(Function<IterationDecision(LoadedLibrary const&)> func) const
{
for (const auto& lib_name : m_loaded_libraries.keys()) {
const auto& lib = *m_loaded_libraries.get(lib_name).value();
if (func(lib) == IterationDecision::Break)
break;
}
}
OwnPtr<DebugSession> DebugSession::exec_and_attach(String const& command, String source_root)
{
auto pid = fork();
@ -110,39 +119,39 @@ OwnPtr<DebugSession> DebugSession::exec_and_attach(String const& command, String
return debug_session;
}
bool DebugSession::poke(u32* address, u32 data)
bool DebugSession::poke(void* address, FlatPtr data)
{
if (ptrace(PT_POKE, m_debuggee_pid, (void*)address, data) < 0) {
if (ptrace(PT_POKE, m_debuggee_pid, (void*)address, (void*)data) < 0) {
perror("PT_POKE");
return false;
}
return true;
}
Optional<u32> DebugSession::peek(u32* address) const
Optional<FlatPtr> DebugSession::peek(void* address) const
{
Optional<u32> result;
int rc = ptrace(PT_PEEK, m_debuggee_pid, (void*)address, 0);
Optional<FlatPtr> result;
auto rc = ptrace(PT_PEEK, m_debuggee_pid, address, nullptr);
if (errno == 0)
result = static_cast<u32>(rc);
result = static_cast<FlatPtr>(rc);
return result;
}
bool DebugSession::poke_debug(u32 register_index, u32 data)
bool DebugSession::poke_debug(u32 register_index, FlatPtr data)
{
if (ptrace(PT_POKEDEBUG, m_debuggee_pid, reinterpret_cast<u32*>(register_index), data) < 0) {
if (ptrace(PT_POKEDEBUG, m_debuggee_pid, reinterpret_cast<void*>(register_index), (void*)data) < 0) {
perror("PT_POKEDEBUG");
return false;
}
return true;
}
Optional<u32> DebugSession::peek_debug(u32 register_index) const
Optional<FlatPtr> DebugSession::peek_debug(u32 register_index) const
{
Optional<u32> result;
int rc = ptrace(PT_PEEKDEBUG, m_debuggee_pid, reinterpret_cast<u32*>(register_index), 0);
Optional<FlatPtr> result;
int rc = ptrace(PT_PEEKDEBUG, m_debuggee_pid, reinterpret_cast<FlatPtr*>(register_index), nullptr);
if (errno == 0)
result = static_cast<u32>(rc);
result = static_cast<FlatPtr>(rc);
return result;
}
@ -155,7 +164,7 @@ bool DebugSession::insert_breakpoint(void* address)
if (m_breakpoints.contains(address))
return false;
auto original_bytes = peek(reinterpret_cast<u32*>(address));
auto original_bytes = peek(reinterpret_cast<FlatPtr*>(address));
if (!original_bytes.has_value())
return false;
@ -175,7 +184,7 @@ bool DebugSession::disable_breakpoint(void* address)
{
auto breakpoint = m_breakpoints.get(address);
VERIFY(breakpoint.has_value());
if (!poke(reinterpret_cast<u32*>(reinterpret_cast<char*>(breakpoint.value().address)), breakpoint.value().original_first_word))
if (!poke(reinterpret_cast<FlatPtr*>(reinterpret_cast<char*>(breakpoint.value().address)), breakpoint.value().original_first_word))
return false;
auto bp = m_breakpoints.get(breakpoint.value().address).value();
@ -191,7 +200,7 @@ bool DebugSession::enable_breakpoint(void* address)
VERIFY(breakpoint.value().state == BreakPointState::Disabled);
if (!poke(reinterpret_cast<u32*>(breakpoint.value().address), (breakpoint.value().original_first_word & ~(uint32_t)0xff) | BREAKPOINT_INSTRUCTION))
if (!poke(reinterpret_cast<FlatPtr*>(breakpoint.value().address), (breakpoint.value().original_first_word & ~(FlatPtr)0xff) | BREAKPOINT_INSTRUCTION))
return false;
auto bp = m_breakpoints.get(breakpoint.value().address).value();
@ -219,7 +228,8 @@ bool DebugSession::insert_watchpoint(void* address, u32 ebp)
auto current_register_status = peek_debug(DEBUG_CONTROL_REGISTER);
if (!current_register_status.has_value())
return false;
u32 dr7_value = current_register_status.value();
// FIXME: 64 bit support
u32 dr7_value = static_cast<u32>(current_register_status.value());
u32 next_available_index;
for (next_available_index = 0; next_available_index < 4; next_available_index++) {
auto bitmask = 1 << (next_available_index * 2);
@ -455,54 +465,4 @@ void DebugSession::update_loaded_libs()
});
}
const DebugSession::LoadedLibrary* DebugSession::library_at(FlatPtr address) const
{
const LoadedLibrary* result = nullptr;
for_each_loaded_library([&result, address](const auto& lib) {
if (address >= lib.base_address && address < lib.base_address + lib.debug_info->elf().size()) {
result = &lib;
return IterationDecision::Break;
}
return IterationDecision::Continue;
});
return result;
}
Optional<DebugSession::SymbolicationResult> DebugSession::symbolicate(FlatPtr address) const
{
auto* lib = library_at(address);
if (!lib)
return {};
//FIXME: ELF::Image symlicate() API should return String::empty() if symbol is not found (It currently returns ??)
auto symbol = lib->debug_info->elf().symbolicate(address - lib->base_address);
return { { lib->name, symbol } };
}
Optional<DebugInfo::SourcePositionAndAddress> DebugSession::get_address_from_source_position(String const& file, size_t line) const
{
Optional<DebugInfo::SourcePositionAndAddress> result;
for_each_loaded_library([file, line, &result](auto& lib) {
// The loader contains its own definitions for LibC symbols, so we don't want to include it in the search.
if (lib.name == "Loader.so")
return IterationDecision::Continue;
auto source_position_and_address = lib.debug_info->get_address_from_source_position(file, line);
if (!source_position_and_address.has_value())
return IterationDecision::Continue;
result = source_position_and_address;
result.value().address += lib.base_address;
return IterationDecision::Break;
});
return result;
}
Optional<DebugInfo::SourcePosition> DebugSession::get_source_position(FlatPtr address) const
{
auto* lib = library_at(address);
if (!lib)
return {};
return lib->debug_info->get_source_position(address - lib->base_address);
}
}