2018-12-24 21:59:10 +00:00
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#include "KSyms.h"
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#include "Process.h"
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#include "Scheduler.h"
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static KSym* s_ksyms;
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dword ksym_lowest_address;
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dword ksym_highest_address;
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dword ksym_count;
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bool ksyms_ready;
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static byte parse_hex_digit(char nibble)
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{
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if (nibble >= '0' && nibble <= '9')
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return nibble - '0';
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ASSERT(nibble >= 'a' && nibble <= 'f');
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return 10 + (nibble - 'a');
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}
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const KSym* ksymbolicate(dword address)
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{
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if (address < ksym_lowest_address || address > ksym_highest_address)
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return nullptr;
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for (unsigned i = 0; i < ksym_count; ++i) {
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if (address < s_ksyms[i + 1].address)
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return &s_ksyms[i];
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}
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return nullptr;
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}
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static void load_ksyms_from_data(const ByteBuffer& buffer)
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{
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auto* bufptr = (const char*)buffer.pointer();
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auto* start_of_name = bufptr;
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dword address = 0;
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for (unsigned i = 0; i < 8; ++i)
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ksym_count = (ksym_count << 4) | parse_hex_digit(*(bufptr++));
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s_ksyms = static_cast<KSym*>(kmalloc_eternal(sizeof(KSym) * ksym_count));
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++bufptr; // skip newline
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2019-02-06 17:52:12 +00:00
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kprintf("Loading ksyms...");
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2018-12-24 21:59:10 +00:00
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unsigned current_ksym_index = 0;
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while (bufptr < buffer.end_pointer()) {
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for (unsigned i = 0; i < 8; ++i)
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address = (address << 4) | parse_hex_digit(*(bufptr++));
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bufptr += 3;
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start_of_name = bufptr;
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while (*(++bufptr)) {
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if (*bufptr == '\n') {
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break;
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}
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}
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auto& ksym = s_ksyms[current_ksym_index];
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ksym.address = address;
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char* name = static_cast<char*>(kmalloc_eternal((bufptr - start_of_name) + 1));
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memcpy(name, start_of_name, bufptr - start_of_name);
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name[bufptr - start_of_name] = '\0';
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ksym.name = name;
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if (ksym.address < ksym_lowest_address)
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ksym_lowest_address = ksym.address;
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if (ksym.address > ksym_highest_address)
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ksym_highest_address = ksym.address;
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++bufptr;
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++current_ksym_index;
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}
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2019-02-06 17:52:12 +00:00
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kprintf("ok\n");
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2018-12-24 21:59:10 +00:00
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ksyms_ready = true;
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}
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2019-02-24 13:51:48 +00:00
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[[gnu::noinline]] void dump_backtrace_impl(dword ebp, bool use_ksyms)
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2018-12-24 21:59:10 +00:00
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{
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if (!current) {
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2019-03-23 21:03:17 +00:00
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//hang();
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2018-12-24 21:59:10 +00:00
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return;
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}
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if (use_ksyms && !ksyms_ready) {
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2019-02-15 11:30:48 +00:00
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hang();
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2018-12-24 21:59:10 +00:00
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return;
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}
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struct RecognizedSymbol {
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dword address;
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const KSym* ksym;
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};
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2019-04-15 21:50:25 +00:00
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int max_recognized_symbol_count = 256;
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RecognizedSymbol recognized_symbols[max_recognized_symbol_count];
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int recognized_symbol_count = 0;
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2018-12-24 21:59:10 +00:00
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if (use_ksyms) {
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2019-03-23 21:03:17 +00:00
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for (dword* stack_ptr = (dword*)ebp; current->process().validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
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2019-01-31 16:31:23 +00:00
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dword retaddr = stack_ptr[1];
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2018-12-24 21:59:10 +00:00
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if (auto* ksym = ksymbolicate(retaddr))
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2019-04-15 21:50:25 +00:00
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recognized_symbols[recognized_symbol_count++] = { retaddr, ksym };
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2018-12-24 21:59:10 +00:00
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}
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2019-04-15 21:50:25 +00:00
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} else {
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2019-03-23 21:03:17 +00:00
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for (dword* stack_ptr = (dword*)ebp; current->process().validate_read_from_kernel(LinearAddress((dword)stack_ptr)); stack_ptr = (dword*)*stack_ptr) {
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2019-01-31 16:31:23 +00:00
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dword retaddr = stack_ptr[1];
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2019-04-15 21:50:25 +00:00
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dbgprintf("%x (next: %x)\n", retaddr, stack_ptr ? (dword*)*stack_ptr : 0);
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2018-12-24 21:59:10 +00:00
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}
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return;
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}
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2019-04-15 21:50:25 +00:00
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ASSERT(recognized_symbol_count < max_recognized_symbol_count);
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2019-01-31 16:31:23 +00:00
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size_t bytes_needed = 0;
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2019-04-15 21:50:25 +00:00
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for (int i = 0; i < recognized_symbol_count; ++i) {
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auto& symbol = recognized_symbols[i];
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2019-01-31 16:31:23 +00:00
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bytes_needed += strlen(symbol.ksym->name) + 8 + 16;
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2018-12-24 21:59:10 +00:00
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}
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2019-04-15 21:50:25 +00:00
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for (int i = 0; i < recognized_symbol_count; ++i) {
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auto& symbol = recognized_symbols[i];
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2018-12-24 21:59:10 +00:00
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unsigned offset = symbol.address - symbol.ksym->address;
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2019-04-15 21:50:25 +00:00
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dbgprintf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset);
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2018-12-24 21:59:10 +00:00
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}
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}
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2019-02-24 13:51:48 +00:00
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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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2018-12-24 21:59:10 +00:00
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void init_ksyms()
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{
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ksyms_ready = false;
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ksym_lowest_address = 0xffffffff;
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ksym_highest_address = 0;
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ksym_count = 0;
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}
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void load_ksyms()
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{
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2019-03-06 21:14:31 +00:00
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auto result = VFS::the().open("/kernel.map", 0, 0, *VFS::the().root_inode());
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ASSERT(!result.is_error());
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auto descriptor = result.value();
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2019-03-23 21:03:17 +00:00
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auto buffer = descriptor->read_entire_file(current->process());
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2019-03-06 21:14:31 +00:00
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ASSERT(buffer);
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load_ksyms_from_data(buffer);
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2018-12-24 21:59:10 +00:00
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}
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