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Debugger: Add basic backtrace support

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This adds the "bt" command to the debugger which displays a backtrace
of the current thread.
This commit is contained in:
spigwitmer 2021-05-15 23:47:01 +00:00 • committed by GitHub
parent f70a6ff712
commit 04f26183cb
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1 changed files with 25 additions and 0 deletions
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25
Userland/Applications/Debugger/main.cpp
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@ -78,6 +78,28 @@ static bool handle_disassemble_command(const String& command, void* first_instru
return true; return true;
} }
static bool handle_backtrace_command(const PtraceRegisters& regs)
{
auto ebp_val = regs.ebp;
auto eip_val = regs.eip;
outln("Backtrace:\n");
while (g_debug_session->peek((u32*)eip_val).has_value() && g_debug_session->peek((u32*)ebp_val).has_value()) {
auto eip_symbol = g_debug_session->symbolicate(eip_val);
auto source_position = g_debug_session->get_source_position(eip_val);
String symbol_location = (eip_symbol.has_value() && eip_symbol->symbol != "") ? eip_symbol->symbol : "???";
if (source_position.has_value()) {
outln("{:p} in {} ({}:{})", eip_val, symbol_location, source_position->file_path, source_position->line_number);
} else {
outln("{:p} in {}", eip_val, symbol_location);
}
auto next_eip = g_debug_session->peek((u32*)(ebp_val + 4));
auto next_ebp = g_debug_session->peek((u32*)ebp_val);
eip_val = (u32)next_eip.value();
ebp_val = (u32)next_ebp.value();
}
return true;
}
static bool insert_breakpoint_at_address(FlatPtr address) static bool insert_breakpoint_at_address(FlatPtr address)
{ {
return g_debug_session->insert_breakpoint((void*)address); return g_debug_session->insert_breakpoint((void*)address);
@ -165,6 +187,7 @@ static void print_help()
"regs - Print registers\n" "regs - Print registers\n"
"dis [number of instructions] - Print disassembly\n" "dis [number of instructions] - Print disassembly\n"
"bp <address/symbol/file:line> - Insert a breakpoint\n" "bp <address/symbol/file:line> - Insert a breakpoint\n"
"bt - show backtrace for current thread\n"
"x <address> - examine dword in memory\n"); "x <address> - examine dword in memory\n");
} }
@ -274,6 +297,8 @@ int main(int argc, char** argv)
success = handle_breakpoint_command(command); success = handle_breakpoint_command(command);
} else if (command.starts_with("x")) { } else if (command.starts_with("x")) {
success = handle_examine_command(command); success = handle_examine_command(command);
} else if (command.starts_with("bt")) {
success = handle_backtrace_command(regs);
} }
if (success && !command.is_empty()) { if (success && !command.is_empty()) {