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Kernel: Make dump_backtrace() kinda sorta work.

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This commit is contained in:
Andreas Kling 2019-02-24 14:51:48 +01:00
parent d218686c0a
commit 9fd4f4862b
2 changed files with 13 additions and 4 deletions
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15
Kernel/KSyms.cpp
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@ -71,7 +71,7 @@ static void load_ksyms_from_data(const ByteBuffer& buffer)
ksyms_ready = true; ksyms_ready = true;
} }
void dump_backtrace(bool use_ksyms) [[gnu::noinline]] void dump_backtrace_impl(dword ebp, bool use_ksyms)
{ {
if (!current) { if (!current) {
hang(); hang();
@ -87,13 +87,13 @@ void dump_backtrace(bool use_ksyms)
}; };
Vector<RecognizedSymbol> recognized_symbols; Vector<RecognizedSymbol> recognized_symbols;
if (use_ksyms) { if (use_ksyms) {
for (dword* stack_ptr = (dword*)&use_ksyms; current->validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) { for (dword* stack_ptr = (dword*)ebp; current->validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
dword retaddr = stack_ptr[1]; dword retaddr = stack_ptr[1];
if (auto* ksym = ksymbolicate(retaddr)) if (auto* ksym = ksymbolicate(retaddr))
recognized_symbols.append({ retaddr, ksym }); recognized_symbols.append({ retaddr, ksym });
} }
} else{ } else{
for (dword* stack_ptr = (dword*)&use_ksyms; current->validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) { for (dword* stack_ptr = (dword*)ebp; current->validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
dword retaddr = stack_ptr[1]; dword retaddr = stack_ptr[1];
kprintf("%x (next: %x)\n", retaddr, stack_ptr ? (dword*)*stack_ptr : 0); kprintf("%x (next: %x)\n", retaddr, stack_ptr ? (dword*)*stack_ptr : 0);
} }
@ -105,10 +105,17 @@ void dump_backtrace(bool use_ksyms)
} }
for (auto& symbol : recognized_symbols) { for (auto& symbol : recognized_symbols) {
unsigned offset = symbol.address - symbol.ksym->address; unsigned offset = symbol.address - symbol.ksym->address;
dbgprintf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset); kprintf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset);
} }
} }
void dump_backtrace(bool use_ksyms)
{
dword ebp;
asm volatile("movl %%ebp, %%eax":"=a"(ebp));
dump_backtrace_impl(ebp, use_ksyms);
}
void init_ksyms() void init_ksyms()
{ {
ksyms_ready = false; ksyms_ready = false;

2
Kernel/KSyms.h
View file

@ -15,3 +15,5 @@ void init_ksyms();
extern bool ksyms_ready; extern bool ksyms_ready;
extern dword ksym_lowest_address; extern dword ksym_lowest_address;
extern dword ksym_highest_address; extern dword ksym_highest_address;
void dump_backtrace(bool use_ksyms);