mirror of
https://github.com/LadybirdBrowser/ladybird.git
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196 lines
7 KiB
C++
196 lines
7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Demangle.h>
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#include <AK/TemporaryChange.h>
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#include <Kernel/FileSystem/FileDescription.h>
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#include <Kernel/KSyms.h>
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#include <Kernel/Process.h>
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#include <Kernel/Scheduler.h>
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namespace Kernel {
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FlatPtr g_lowest_kernel_symbol_address = 0xffffffff;
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FlatPtr g_highest_kernel_symbol_address = 0;
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bool g_kernel_symbols_available = false;
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static KernelSymbol* s_symbols;
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static size_t s_symbol_count = 0;
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static u8 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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u32 address_for_kernel_symbol(const StringView& name)
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{
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for (size_t i = 0; i < s_symbol_count; ++i) {
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if (!strncmp(name.characters_without_null_termination(), s_symbols[i].name, name.length()))
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return s_symbols[i].address;
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}
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return 0;
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}
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const KernelSymbol* symbolicate_kernel_address(u32 address)
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{
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if (address < g_lowest_kernel_symbol_address || address > g_highest_kernel_symbol_address)
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return nullptr;
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for (unsigned i = 0; i < s_symbol_count; ++i) {
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if (address < s_symbols[i + 1].address)
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return &s_symbols[i];
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}
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return nullptr;
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}
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UNMAP_AFTER_INIT static void load_kernel_sybols_from_data(const KBuffer& buffer)
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{
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g_lowest_kernel_symbol_address = 0xffffffff;
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g_highest_kernel_symbol_address = 0;
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auto* bufptr = (const char*)buffer.data();
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auto* start_of_name = bufptr;
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FlatPtr address = 0;
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for (size_t i = 0; i < 8; ++i)
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s_symbol_count = (s_symbol_count << 4) | parse_hex_digit(*(bufptr++));
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s_symbols = static_cast<KernelSymbol*>(kmalloc_eternal(sizeof(KernelSymbol) * s_symbol_count));
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++bufptr; // skip newline
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klog() << "Loading kernel symbol table...";
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size_t current_symbol_index = 0;
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while (bufptr < buffer.end_pointer()) {
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for (size_t 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_symbols[current_symbol_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 < g_lowest_kernel_symbol_address)
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g_lowest_kernel_symbol_address = ksym.address;
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if (ksym.address > g_highest_kernel_symbol_address)
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g_highest_kernel_symbol_address = ksym.address;
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++bufptr;
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++current_symbol_index;
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}
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g_kernel_symbols_available = true;
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}
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NEVER_INLINE static void dump_backtrace_impl(FlatPtr base_pointer, bool use_ksyms)
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{
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SmapDisabler disabler;
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if (use_ksyms && !g_kernel_symbols_available) {
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Processor::halt();
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return;
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}
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struct RecognizedSymbol {
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FlatPtr address;
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const KernelSymbol* symbol { nullptr };
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};
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size_t max_recognized_symbol_count = 256;
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RecognizedSymbol recognized_symbols[max_recognized_symbol_count];
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size_t recognized_symbol_count = 0;
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if (use_ksyms) {
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FlatPtr copied_stack_ptr[2];
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for (FlatPtr* stack_ptr = (FlatPtr*)base_pointer; stack_ptr && recognized_symbol_count < max_recognized_symbol_count; stack_ptr = (FlatPtr*)copied_stack_ptr[0]) {
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if ((FlatPtr)stack_ptr < 0xc0000000)
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break;
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void* fault_at;
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if (!safe_memcpy(copied_stack_ptr, stack_ptr, sizeof(copied_stack_ptr), fault_at))
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break;
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FlatPtr retaddr = copied_stack_ptr[1];
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recognized_symbols[recognized_symbol_count++] = { retaddr, symbolicate_kernel_address(retaddr) };
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}
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} else {
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void* fault_at;
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FlatPtr copied_stack_ptr[2];
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FlatPtr* stack_ptr = (FlatPtr*)base_pointer;
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while (stack_ptr && safe_memcpy(copied_stack_ptr, stack_ptr, sizeof(copied_stack_ptr), fault_at)) {
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FlatPtr retaddr = copied_stack_ptr[1];
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dbgln("{:p} (next: {:p})", retaddr, stack_ptr ? (u32*)copied_stack_ptr[0] : 0);
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stack_ptr = (FlatPtr*)copied_stack_ptr[0];
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}
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return;
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}
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ASSERT(recognized_symbol_count <= max_recognized_symbol_count);
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for (size_t i = 0; i < recognized_symbol_count; ++i) {
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auto& symbol = recognized_symbols[i];
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if (!symbol.address)
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break;
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if (!symbol.symbol) {
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dbgln("{:p}", symbol.address);
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continue;
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}
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size_t offset = symbol.address - symbol.symbol->address;
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if (symbol.symbol->address == g_highest_kernel_symbol_address && offset > 4096)
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dbgln("{:p}", symbol.address);
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else
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dbgln("{:p} {} +0x{:x}", symbol.address, demangle(symbol.symbol->name), offset);
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}
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}
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void dump_backtrace()
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{
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static bool in_dump_backtrace = false;
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if (in_dump_backtrace)
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return;
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TemporaryChange change(in_dump_backtrace, true);
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TemporaryChange disable_kmalloc_stacks(g_dump_kmalloc_stacks, false);
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FlatPtr ebp;
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asm volatile("movl %%ebp, %%eax"
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: "=a"(ebp));
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dump_backtrace_impl(ebp, g_kernel_symbols_available);
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}
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UNMAP_AFTER_INIT void load_kernel_symbol_table()
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{
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auto result = VFS::the().open("/res/kernel.map", O_RDONLY, 0, VFS::the().root_custody());
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if (!result.is_error()) {
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auto description = result.value();
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auto buffer = description->read_entire_file();
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if (!buffer.is_error())
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load_kernel_sybols_from_data(*buffer.value());
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}
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}
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}
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