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UserspaceEmulator: Capture backtraces of malloc/free events

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This lets us show backtraces for each leaked mallocation in the leak
report at the end. :^)
This commit is contained in:
Andreas Kling 2020-07-16 17:14:58 +02:00
parent f6584bfc36
commit 441918be7e
4 changed files with 32 additions and 14 deletions
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32
DevTools/UserspaceEmulator/Emulator.cpp
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@ -188,24 +188,34 @@ bool Emulator::is_in_malloc_or_free() const
static pid_t s_pid = getpid();
void Emulator::dump_backtrace()
Vector<FlatPtr> Emulator::raw_backtrace()
{
u32 offset = 0;
String symbol = m_elf->symbolicate(m_cpu.eip(), &offset);
dbgprintf("==%d== %#08x %s +%#x\n", s_pid, m_cpu.eip(), symbol.characters(), offset);
Vector<FlatPtr> backtrace;
backtrace.append(m_cpu.eip());
u32 frame_ptr = m_cpu.ebp();
while (frame_ptr) {
u32 ret_ptr = m_mmu.read32({ 0x20, frame_ptr + 4 });
if (!ret_ptr)
return;
symbol = m_elf->symbolicate(ret_ptr, &offset);
if (!symbol.is_null())
dbgprintf("==%d== %#08x %s +%#x\n", s_pid, ret_ptr, symbol.characters(), offset);
break;
backtrace.append(ret_ptr);
frame_ptr = m_mmu.read32({ 0x20, frame_ptr });
}
return backtrace;
}
void Emulator::dump_backtrace(const Vector<FlatPtr>& backtrace)
{
for (auto& address : backtrace) {
u32 offset = 0;
String symbol = m_elf->symbolicate(address, &offset);
dbgprintf("==%d== %#08x %s +%#x\n", s_pid, m_cpu.eip(), symbol.characters(), offset);
}
}
void Emulator::dump_backtrace()
{
dump_backtrace(raw_backtrace());
}
u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
@ -306,7 +316,7 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
case SC_clock_gettime:
return virt$clock_gettime(arg1, arg2);
case SC_getrandom:
return virt$getrandom(arg1, arg2, arg3) ;
return virt$getrandom(arg1, arg2, arg3);
default:
warn() << "Unimplemented syscall: " << Syscall::to_string((Syscall::Function)function);