backtrace.cpp

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#include <cpu_io.h>
#include <elf.h>
 
#include <array>
#include <cerrno>
#include <cstdint>
 
#include "arch.h"
#include "basic_info.hpp"
#include "kernel.h"
#include "kernel_elf.hpp"
#include "kernel_log.hpp"
 
__always_inline auto backtrace(std::array<uint64_t, kMaxFrameCount>& buffer)
    -> int {
  auto* x29 = reinterpret_cast<uint64_t*>(cpu_io::X29::Read());
  size_t count = 0;
  while ((x29 != nullptr) && (x29[0] != 0U) &&
         x29[0] >= reinterpret_cast<uint64_t>(__executable_start) &&
         x29[0] <= reinterpret_cast<uint64_t>(__etext) &&
         count < buffer.max_size()) {
    auto lr = x29[1];
    x29 = reinterpret_cast<uint64_t*>(x29[0]);
    buffer[count++] = lr;
  }
 
  return static_cast<int>(count);
}
 
auto DumpStack() -> void {
  std::array<uint64_t, kMaxFrameCount> buffer{};
 
  // 获取调用栈中的地址
  auto num_frames = backtrace(buffer);
 
  // 打印函数名
  for (auto current_frame_idx = 0; current_frame_idx < num_frames;
       current_frame_idx++) {
    for (auto symtab : KernelElfSingleton::instance().symtab) {
      if ((ELF64_ST_TYPE(symtab.st_info) == STT_FUNC) &&
          (buffer[current_frame_idx] >= symtab.st_value) &&
          (buffer[current_frame_idx] <= symtab.st_value + symtab.st_size)) {
        klog::Err("[{}] {:#x}",
                  reinterpret_cast<const char*>(
                      KernelElfSingleton::instance().strtab + symtab.st_name),
                  buffer[current_frame_idx]);
      }
    }
  }
}