mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-06 08:56:40 +00:00
198 lines
7 KiB
C++
198 lines
7 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <AK/Demangle.h>
|
|
#include <AK/TemporaryChange.h>
|
|
#include <Kernel/Arch/x86/SmapDisabler.h>
|
|
#include <Kernel/FileSystem/FileDescription.h>
|
|
#include <Kernel/KSyms.h>
|
|
#include <Kernel/Process.h>
|
|
#include <Kernel/Scheduler.h>
|
|
|
|
namespace Kernel {
|
|
|
|
FlatPtr g_lowest_kernel_symbol_address = 0xffffffff;
|
|
FlatPtr g_highest_kernel_symbol_address = 0;
|
|
bool g_kernel_symbols_available = false;
|
|
|
|
static KernelSymbol* s_symbols;
|
|
static size_t s_symbol_count = 0;
|
|
|
|
static u8 parse_hex_digit(char nibble)
|
|
{
|
|
if (nibble >= '0' && nibble <= '9')
|
|
return nibble - '0';
|
|
VERIFY(nibble >= 'a' && nibble <= 'f');
|
|
return 10 + (nibble - 'a');
|
|
}
|
|
|
|
FlatPtr address_for_kernel_symbol(const StringView& name)
|
|
{
|
|
for (size_t i = 0; i < s_symbol_count; ++i) {
|
|
if (!strncmp(name.characters_without_null_termination(), s_symbols[i].name, name.length()))
|
|
return s_symbols[i].address;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const KernelSymbol* symbolicate_kernel_address(FlatPtr address)
|
|
{
|
|
if (address < g_lowest_kernel_symbol_address || address > g_highest_kernel_symbol_address)
|
|
return nullptr;
|
|
for (unsigned i = 0; i < s_symbol_count; ++i) {
|
|
if (address < s_symbols[i + 1].address)
|
|
return &s_symbols[i];
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
UNMAP_AFTER_INIT static void load_kernel_sybols_from_data(const KBuffer& buffer)
|
|
{
|
|
g_lowest_kernel_symbol_address = 0xffffffff;
|
|
g_highest_kernel_symbol_address = 0;
|
|
|
|
auto* bufptr = (const char*)buffer.data();
|
|
auto* start_of_name = bufptr;
|
|
FlatPtr address = 0;
|
|
|
|
for (size_t i = 0; i < 8; ++i)
|
|
s_symbol_count = (s_symbol_count << 4) | parse_hex_digit(*(bufptr++));
|
|
s_symbols = static_cast<KernelSymbol*>(kmalloc_eternal(sizeof(KernelSymbol) * s_symbol_count));
|
|
++bufptr; // skip newline
|
|
|
|
dmesgln("Loading kernel symbol table...");
|
|
|
|
size_t current_symbol_index = 0;
|
|
|
|
while (bufptr < buffer.end_pointer()) {
|
|
for (size_t i = 0; i < 8; ++i)
|
|
address = (address << 4) | parse_hex_digit(*(bufptr++));
|
|
bufptr += 3;
|
|
start_of_name = bufptr;
|
|
while (*(++bufptr)) {
|
|
if (*bufptr == '\n') {
|
|
break;
|
|
}
|
|
}
|
|
auto& ksym = s_symbols[current_symbol_index];
|
|
ksym.address = address;
|
|
char* name = static_cast<char*>(kmalloc_eternal((bufptr - start_of_name) + 1));
|
|
memcpy(name, start_of_name, bufptr - start_of_name);
|
|
name[bufptr - start_of_name] = '\0';
|
|
ksym.name = name;
|
|
|
|
if (ksym.address < g_lowest_kernel_symbol_address)
|
|
g_lowest_kernel_symbol_address = ksym.address;
|
|
if (ksym.address > g_highest_kernel_symbol_address)
|
|
g_highest_kernel_symbol_address = ksym.address;
|
|
|
|
++bufptr;
|
|
++current_symbol_index;
|
|
}
|
|
g_kernel_symbols_available = true;
|
|
}
|
|
|
|
NEVER_INLINE static void dump_backtrace_impl(FlatPtr base_pointer, bool use_ksyms)
|
|
{
|
|
SmapDisabler disabler;
|
|
if (use_ksyms && !g_kernel_symbols_available) {
|
|
Processor::halt();
|
|
return;
|
|
}
|
|
|
|
struct RecognizedSymbol {
|
|
FlatPtr address;
|
|
const KernelSymbol* symbol { nullptr };
|
|
};
|
|
constexpr size_t max_recognized_symbol_count = 256;
|
|
RecognizedSymbol recognized_symbols[max_recognized_symbol_count];
|
|
size_t recognized_symbol_count = 0;
|
|
if (use_ksyms) {
|
|
FlatPtr copied_stack_ptr[2];
|
|
for (FlatPtr* stack_ptr = (FlatPtr*)base_pointer; stack_ptr && recognized_symbol_count < max_recognized_symbol_count; stack_ptr = (FlatPtr*)copied_stack_ptr[0]) {
|
|
if ((FlatPtr)stack_ptr < 0xc0000000)
|
|
break;
|
|
|
|
void* fault_at;
|
|
if (!safe_memcpy(copied_stack_ptr, stack_ptr, sizeof(copied_stack_ptr), fault_at))
|
|
break;
|
|
FlatPtr retaddr = copied_stack_ptr[1];
|
|
recognized_symbols[recognized_symbol_count++] = { retaddr, symbolicate_kernel_address(retaddr) };
|
|
}
|
|
} else {
|
|
void* fault_at;
|
|
FlatPtr copied_stack_ptr[2];
|
|
FlatPtr* stack_ptr = (FlatPtr*)base_pointer;
|
|
while (stack_ptr && safe_memcpy(copied_stack_ptr, stack_ptr, sizeof(copied_stack_ptr), fault_at)) {
|
|
FlatPtr retaddr = copied_stack_ptr[1];
|
|
dbgln("{:p} (next: {:p})", retaddr, stack_ptr ? (FlatPtr*)copied_stack_ptr[0] : 0);
|
|
stack_ptr = (FlatPtr*)copied_stack_ptr[0];
|
|
}
|
|
return;
|
|
}
|
|
VERIFY(recognized_symbol_count <= max_recognized_symbol_count);
|
|
for (size_t i = 0; i < recognized_symbol_count; ++i) {
|
|
auto& symbol = recognized_symbols[i];
|
|
if (!symbol.address)
|
|
break;
|
|
if (!symbol.symbol) {
|
|
dbgln("{:p}", symbol.address);
|
|
continue;
|
|
}
|
|
size_t offset = symbol.address - symbol.symbol->address;
|
|
if (symbol.symbol->address == g_highest_kernel_symbol_address && offset > 4096)
|
|
dbgln("{:p}", symbol.address);
|
|
else
|
|
dbgln("{:p} {} +0x{:x}", symbol.address, demangle(symbol.symbol->name), offset);
|
|
}
|
|
}
|
|
|
|
void dump_backtrace()
|
|
{
|
|
static bool in_dump_backtrace = false;
|
|
if (in_dump_backtrace)
|
|
return;
|
|
TemporaryChange change(in_dump_backtrace, true);
|
|
TemporaryChange disable_kmalloc_stacks(g_dump_kmalloc_stacks, false);
|
|
FlatPtr ebp;
|
|
asm volatile("movl %%ebp, %%eax"
|
|
: "=a"(ebp));
|
|
dump_backtrace_impl(ebp, g_kernel_symbols_available);
|
|
}
|
|
|
|
UNMAP_AFTER_INIT void load_kernel_symbol_table()
|
|
{
|
|
auto result = VFS::the().open("/res/kernel.map", O_RDONLY, 0, VFS::the().root_custody());
|
|
if (!result.is_error()) {
|
|
auto description = result.value();
|
|
auto buffer = description->read_entire_file();
|
|
if (!buffer.is_error())
|
|
load_kernel_sybols_from_data(*buffer.value());
|
|
}
|
|
}
|
|
|
|
}
|