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https://github.com/SerenityOS/serenity
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Kernel: Make dump_backtrace() kinda sorta work.
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@ -71,7 +71,7 @@ static void load_ksyms_from_data(const ByteBuffer& buffer)
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ksyms_ready = true;
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}
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void dump_backtrace(bool use_ksyms)
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[[gnu::noinline]] void dump_backtrace_impl(dword ebp, bool use_ksyms)
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{
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if (!current) {
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hang();
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@ -87,13 +87,13 @@ void dump_backtrace(bool use_ksyms)
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};
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Vector<RecognizedSymbol> recognized_symbols;
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if (use_ksyms) {
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for (dword* stack_ptr = (dword*)&use_ksyms; current->validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
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for (dword* stack_ptr = (dword*)ebp; current->validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
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dword retaddr = stack_ptr[1];
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if (auto* ksym = ksymbolicate(retaddr))
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recognized_symbols.append({ retaddr, ksym });
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}
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} else{
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for (dword* stack_ptr = (dword*)&use_ksyms; current->validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
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for (dword* stack_ptr = (dword*)ebp; current->validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
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dword retaddr = stack_ptr[1];
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kprintf("%x (next: %x)\n", retaddr, stack_ptr ? (dword*)*stack_ptr : 0);
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}
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@ -105,10 +105,17 @@ void dump_backtrace(bool use_ksyms)
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}
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for (auto& symbol : recognized_symbols) {
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unsigned offset = symbol.address - symbol.ksym->address;
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dbgprintf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset);
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kprintf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset);
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}
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}
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void dump_backtrace(bool use_ksyms)
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{
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dword ebp;
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asm volatile("movl %%ebp, %%eax":"=a"(ebp));
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dump_backtrace_impl(ebp, use_ksyms);
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}
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void init_ksyms()
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{
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ksyms_ready = false;
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@ -15,3 +15,5 @@ void init_ksyms();
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extern bool ksyms_ready;
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extern dword ksym_lowest_address;
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extern dword ksym_highest_address;
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void dump_backtrace(bool use_ksyms);
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