C语言 热从 GRUB2 获取 ELF 符号

Question

我正在为我的内核使用 multiboot2，我正在尝试从 GRUB2 获取 ELF 符号，但我不知道该怎么做。

我已经在boot.s中设置了.long MULTIBOOT_TAG_TYPE_ELF_SECTIONS，我也从grub2中获得了精灵类型，大小，数字，entsize和shndx。

.section .multiboot_header
.align 8
multiboot_header:
  .long MULTIBOOT2_HEADER_MAGIC
  .long MULTIBOOT_ARCHITECTURE_I386
  .long multiboot_header_end - multiboot_header
  .long -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT_ARCHITECTURE_I386 + multiboot_header_end - multiboot_header)
# multiboot2 information request
.align 8
mbi_tag_start:
  .short MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST
  .short MULTIBOOT_HEADER_TAG_OPTIONAL
  .long mbi_tag_end - mbi_tag_start
  .long MULTIBOOT_TAG_TYPE_CMDLINE
  .long MULTIBOOT_TAG_TYPE_MODULE
  .long MULTIBOOT_TAG_TYPE_BOOTDEV
  .long MULTIBOOT_TAG_TYPE_MMAP
  .long MULTIBOOT_TAG_TYPE_ELF_SECTIONS
  .long MULTIBOOT_TAG_TYPE_APM
.align 8
mbi_tag_end:
    .short MULTIBOOT_HEADER_TAG_END
  .short 0
  .long 8
multiboot_header_end:

struct multiboot_tag_elf_sections {
    multiboot_uint32_t type;
    multiboot_uint32_t size;
    multiboot_uint32_t num;
    multiboot_uint32_t entsize;
    multiboot_uint32_t shndx;
    char sections[0];
};

Answer 1

在多重引导信息中搜索类型=9的标记。