diff options
Diffstat (limited to 'util/grub-mkimagexx.c')
| -rw-r--r-- | util/grub-mkimagexx.c | 756 |
1 files changed, 756 insertions, 0 deletions
diff --git a/util/grub-mkimagexx.c b/util/grub-mkimagexx.c new file mode 100644 index 0000000..ce51f2f --- /dev/null +++ b/util/grub-mkimagexx.c @@ -0,0 +1,756 @@ +/* grub-mkimage.c - make a bootable image */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009,2010 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#undef ELF_R_SYM +#undef ELF_R_TYPE + +#if defined(MKIMAGE_ELF32) +# define SUFFIX(x) x ## 32 +# define ELFCLASSXX ELFCLASS32 +# define Elf_Ehdr Elf32_Ehdr +# define Elf_Phdr Elf32_Phdr +# define Elf_Addr Elf32_Addr +# define Elf_Sym Elf32_Sym +# define Elf_Off Elf32_Off +# define Elf_Shdr Elf32_Shdr +# define Elf_Rela Elf32_Rela +# define Elf_Rel Elf32_Rel +# define ELF_R_SYM(val) ELF32_R_SYM(val) +# define ELF_R_TYPE(val) ELF32_R_TYPE(val) +#elif defined(MKIMAGE_ELF64) +# define SUFFIX(x) x ## 64 +# define ELFCLASSXX ELFCLASS64 +# define Elf_Ehdr Elf64_Ehdr +# define Elf_Phdr Elf64_Phdr +# define Elf_Addr Elf64_Addr +# define Elf_Sym Elf64_Sym +# define Elf_Off Elf64_Off +# define Elf_Shdr Elf64_Shdr +# define Elf_Rela Elf64_Rela +# define Elf_Rel Elf64_Rel +# define ELF_R_SYM(val) ELF64_R_SYM(val) +# define ELF_R_TYPE(val) ELF64_R_TYPE(val) +#else +#error "I'm confused" +#endif + +/* Relocate symbols; note that this function overwrites the symbol table. + Return the address of a start symbol. */ +static Elf_Addr +SUFFIX (relocate_symbols) (Elf_Ehdr *e, Elf_Shdr *sections, + Elf_Shdr *symtab_section, Elf_Addr *section_addresses, + Elf_Half section_entsize, Elf_Half num_sections, + struct image_target_desc *image_target) +{ + Elf_Word symtab_size, sym_size, num_syms; + Elf_Off symtab_offset; + Elf_Addr start_address = 0; + Elf_Sym *sym; + Elf_Word i; + Elf_Shdr *strtab_section; + const char *strtab; + + strtab_section + = (Elf_Shdr *) ((char *) sections + + (grub_target_to_host32 (symtab_section->sh_link) + * section_entsize)); + strtab = (char *) e + grub_target_to_host (strtab_section->sh_offset); + + symtab_size = grub_target_to_host (symtab_section->sh_size); + sym_size = grub_target_to_host (symtab_section->sh_entsize); + symtab_offset = grub_target_to_host (symtab_section->sh_offset); + num_syms = symtab_size / sym_size; + + for (i = 0, sym = (Elf_Sym *) ((char *) e + symtab_offset); + i < num_syms; + i++, sym = (Elf_Sym *) ((char *) sym + sym_size)) + { + Elf_Section index; + const char *name; + + name = strtab + grub_target_to_host32 (sym->st_name); + + index = grub_target_to_host16 (sym->st_shndx); + if (index == STN_ABS) + { + continue; + } + else if ((index == STN_UNDEF)) + { + if (sym->st_name) + grub_util_error ("undefined symbol %s", name); + else + continue; + } + else if (index >= num_sections) + grub_util_error ("section %d does not exist", index); + + sym->st_value = (grub_target_to_host32 (sym->st_value) + + section_addresses[index]); + grub_util_info ("locating %s at 0x%x", name, sym->st_value); + + if (! start_address) + if (strcmp (name, "_start") == 0 || strcmp (name, "start") == 0) + start_address = sym->st_value; + } + + return start_address; +} + +/* Return the address of a symbol at the index I in the section S. */ +static Elf_Addr +SUFFIX (get_symbol_address) (Elf_Ehdr *e, Elf_Shdr *s, Elf_Word i, + struct image_target_desc *image_target) +{ + Elf_Sym *sym; + + sym = (Elf_Sym *) ((char *) e + + grub_target_to_host32 (s->sh_offset) + + i * grub_target_to_host32 (s->sh_entsize)); + return sym->st_value; +} + +/* Return the address of a modified value. */ +static Elf_Addr * +SUFFIX (get_target_address) (Elf_Ehdr *e, Elf_Shdr *s, Elf_Addr offset, + struct image_target_desc *image_target) +{ + return (Elf_Addr *) ((char *) e + grub_target_to_host32 (s->sh_offset) + offset); +} + +/* Deal with relocation information. This function relocates addresses + within the virtual address space starting from 0. So only relative + addresses can be fully resolved. Absolute addresses must be relocated + again by a PE32 relocator when loaded. */ +static void +SUFFIX (relocate_addresses) (Elf_Ehdr *e, Elf_Shdr *sections, + Elf_Addr *section_addresses, + Elf_Half section_entsize, Elf_Half num_sections, + const char *strtab, struct image_target_desc *image_target) +{ + Elf_Half i; + Elf_Shdr *s; + + for (i = 0, s = sections; + i < num_sections; + i++, s = (Elf_Shdr *) ((char *) s + section_entsize)) + if ((s->sh_type == grub_host_to_target32 (SHT_REL)) || + (s->sh_type == grub_host_to_target32 (SHT_RELA))) + { + Elf_Rela *r; + Elf_Word rtab_size, r_size, num_rs; + Elf_Off rtab_offset; + Elf_Shdr *symtab_section; + Elf_Word target_section_index; + Elf_Addr target_section_addr; + Elf_Shdr *target_section; + Elf_Word j; + + symtab_section = (Elf_Shdr *) ((char *) sections + + (grub_target_to_host32 (s->sh_link) + * section_entsize)); + target_section_index = grub_target_to_host32 (s->sh_info); + target_section_addr = section_addresses[target_section_index]; + target_section = (Elf_Shdr *) ((char *) sections + + (target_section_index + * section_entsize)); + + grub_util_info ("dealing with the relocation section %s for %s", + strtab + grub_target_to_host32 (s->sh_name), + strtab + grub_target_to_host32 (target_section->sh_name)); + + rtab_size = grub_target_to_host32 (s->sh_size); + r_size = grub_target_to_host32 (s->sh_entsize); + rtab_offset = grub_target_to_host32 (s->sh_offset); + num_rs = rtab_size / r_size; + + for (j = 0, r = (Elf_Rela *) ((char *) e + rtab_offset); + j < num_rs; + j++, r = (Elf_Rela *) ((char *) r + r_size)) + { + Elf_Addr info; + Elf_Addr offset; + Elf_Addr sym_addr; + Elf_Addr *target; + Elf_Addr addend; + + offset = grub_target_to_host (r->r_offset); + target = SUFFIX (get_target_address) (e, target_section, + offset, image_target); + info = grub_target_to_host (r->r_info); + sym_addr = SUFFIX (get_symbol_address) (e, symtab_section, + ELF_R_SYM (info), image_target); + + addend = (s->sh_type == grub_target_to_host32 (SHT_RELA)) ? + r->r_addend : 0; + + if (image_target->voidp_sizeof == 4) + switch (ELF_R_TYPE (info)) + { + case R_386_NONE: + break; + + case R_386_32: + /* This is absolute. */ + *target = grub_host_to_target32 (grub_target_to_host32 (*target) + + addend + sym_addr); + grub_util_info ("relocating an R_386_32 entry to 0x%x at the offset 0x%x", + *target, offset); + break; + + case R_386_PC32: + /* This is relative. */ + *target = grub_host_to_target32 (grub_target_to_host32 (*target) + + addend + sym_addr + - target_section_addr - offset + - image_target->vaddr_offset); + grub_util_info ("relocating an R_386_PC32 entry to 0x%x at the offset 0x%x", + *target, offset); + break; + default: + grub_util_error ("unknown relocation type %d", + ELF_R_TYPE (info)); + break; + } + else + switch (ELF_R_TYPE (info)) + { + + case R_X86_64_NONE: + break; + + case R_X86_64_64: + *target = grub_host_to_target64 (grub_target_to_host64 (*target) + + addend + sym_addr); + grub_util_info ("relocating an R_X86_64_64 entry to 0x%llx at the offset 0x%llx", + *target, offset); + break; + + case R_X86_64_PC32: + { + grub_uint32_t *t32 = (grub_uint32_t *) target; + *t32 = grub_host_to_target64 (grub_target_to_host32 (*t32) + + addend + sym_addr + - target_section_addr - offset + - image_target->vaddr_offset); + grub_util_info ("relocating an R_X86_64_PC32 entry to 0x%x at the offset 0x%llx", + *t32, offset); + break; + } + + case R_X86_64_32: + case R_X86_64_32S: + { + grub_uint32_t *t32 = (grub_uint32_t *) target; + *t32 = grub_host_to_target64 (grub_target_to_host32 (*t32) + + addend + sym_addr); + grub_util_info ("relocating an R_X86_64_32(S) entry to 0x%x at the offset 0x%llx", + *t32, offset); + break; + } + + default: + grub_util_error ("unknown relocation type %d", + ELF_R_TYPE (info)); + break; + } + } + } +} + +/* Add a PE32's fixup entry for a relocation. Return the resulting address + after having written to the file OUT. */ +static Elf_Addr +SUFFIX (add_fixup_entry) (struct fixup_block_list **cblock, grub_uint16_t type, + Elf_Addr addr, int flush, Elf_Addr current_address, + struct image_target_desc *image_target) +{ + struct grub_pe32_fixup_block *b; + + b = &((*cblock)->b); + + /* First, check if it is necessary to write out the current block. */ + if ((*cblock)->state) + { + if (flush || addr < b->page_rva || b->page_rva + 0x1000 <= addr) + { + grub_uint32_t size; + + if (flush) + { + /* Add as much padding as necessary to align the address + with a section boundary. */ + Elf_Addr next_address; + unsigned padding_size; + size_t index; + + next_address = current_address + b->block_size; + padding_size = ((ALIGN_UP (next_address, image_target->section_align) + - next_address) + >> 1); + index = ((b->block_size - sizeof (*b)) >> 1); + grub_util_info ("adding %d padding fixup entries", padding_size); + while (padding_size--) + { + b->entries[index++] = 0; + b->block_size += 2; + } + } + else if (b->block_size & (8 - 1)) + { + /* If not aligned with a 32-bit boundary, add + a padding entry. */ + size_t index; + + grub_util_info ("adding a padding fixup entry"); + index = ((b->block_size - sizeof (*b)) >> 1); + b->entries[index] = 0; + b->block_size += 2; + } + + /* Flush it. */ + grub_util_info ("writing %d bytes of a fixup block starting at 0x%x", + b->block_size, b->page_rva); + size = b->block_size; + current_address += size; + b->page_rva = grub_host_to_target32 (b->page_rva); + b->block_size = grub_host_to_target32 (b->block_size); + (*cblock)->next = xmalloc (sizeof (**cblock) + 2 * 0x1000); + memset ((*cblock)->next, 0, sizeof (**cblock) + 2 * 0x1000); + *cblock = (*cblock)->next; + } + } + + b = &((*cblock)->b); + + if (! flush) + { + grub_uint16_t entry; + size_t index; + + /* If not allocated yet, allocate a block with enough entries. */ + if (! (*cblock)->state) + { + (*cblock)->state = 1; + + /* The spec does not mention the requirement of a Page RVA. + Here, align the address with a 4K boundary for safety. */ + b->page_rva = (addr & ~(0x1000 - 1)); + b->block_size = sizeof (*b); + } + + /* Sanity check. */ + if (b->block_size >= sizeof (*b) + 2 * 0x1000) + grub_util_error ("too many fixup entries"); + + /* Add a new entry. */ + index = ((b->block_size - sizeof (*b)) >> 1); + entry = GRUB_PE32_FIXUP_ENTRY (type, addr - b->page_rva); + b->entries[index] = grub_host_to_target16 (entry); + b->block_size += 2; + } + + return current_address; +} + +/* Make a .reloc section. */ +static Elf_Addr +SUFFIX (make_reloc_section) (Elf_Ehdr *e, void **out, + Elf_Addr *section_addresses, Elf_Shdr *sections, + Elf_Half section_entsize, Elf_Half num_sections, + const char *strtab, struct image_target_desc *image_target) +{ + Elf_Half i; + Elf_Shdr *s; + struct fixup_block_list *lst, *lst0; + Elf_Addr current_address = 0; + + lst = lst0 = xmalloc (sizeof (*lst) + 2 * 0x1000); + memset (lst, 0, sizeof (*lst) + 2 * 0x1000); + + for (i = 0, s = sections; + i < num_sections; + i++, s = (Elf_Shdr *) ((char *) s + section_entsize)) + if ((s->sh_type == grub_cpu_to_le32 (SHT_REL)) || + (s->sh_type == grub_cpu_to_le32 (SHT_RELA))) + { + Elf_Rel *r; + Elf_Word rtab_size, r_size, num_rs; + Elf_Off rtab_offset; + Elf_Addr section_address; + Elf_Word j; + + grub_util_info ("translating the relocation section %s", + strtab + grub_le_to_cpu32 (s->sh_name)); + + rtab_size = grub_le_to_cpu32 (s->sh_size); + r_size = grub_le_to_cpu32 (s->sh_entsize); + rtab_offset = grub_le_to_cpu32 (s->sh_offset); + num_rs = rtab_size / r_size; + + section_address = section_addresses[grub_le_to_cpu32 (s->sh_info)]; + + for (j = 0, r = (Elf_Rel *) ((char *) e + rtab_offset); + j < num_rs; + j++, r = (Elf_Rel *) ((char *) r + r_size)) + { + Elf_Addr info; + Elf_Addr offset; + + offset = grub_le_to_cpu32 (r->r_offset); + info = grub_le_to_cpu32 (r->r_info); + + /* Necessary to relocate only absolute addresses. */ + if (image_target->voidp_sizeof == 4) + { + if (ELF_R_TYPE (info) == R_386_32) + { + Elf_Addr addr; + + addr = section_address + offset; + grub_util_info ("adding a relocation entry for 0x%x", addr); + current_address + = SUFFIX (add_fixup_entry) (&lst, + GRUB_PE32_REL_BASED_HIGHLOW, + addr, 0, current_address, + image_target); + } + } + else + { + if ((ELF_R_TYPE (info) == R_X86_64_32) || + (ELF_R_TYPE (info) == R_X86_64_32S)) + { + grub_util_error ("can\'t add fixup entry for R_X86_64_32(S)"); + } + else if (ELF_R_TYPE (info) == R_X86_64_64) + { + Elf_Addr addr; + + addr = section_address + offset; + grub_util_info ("adding a relocation entry for 0x%llx", addr); + current_address + = SUFFIX (add_fixup_entry) (&lst, + GRUB_PE32_REL_BASED_DIR64, + addr, + 0, current_address, + image_target); + } + } + } + } + + current_address = SUFFIX (add_fixup_entry) (&lst, 0, 0, 1, current_address, image_target); + + { + grub_uint8_t *ptr; + ptr = *out = xmalloc (current_address); + for (lst = lst0; lst; lst = lst->next) + if (lst->state) + { + memcpy (ptr, &lst->b, grub_target_to_host32 (lst->b.block_size)); + ptr += grub_target_to_host32 (lst->b.block_size); + } + if (current_address + *out != ptr) + { + grub_util_error ("Bug detected %d != %d\n", ptr - (grub_uint8_t *) *out, + current_address); + } + } + + return current_address; +} + +/* Determine if this section is a text section. Return false if this + section is not allocated. */ +static int +SUFFIX (is_text_section) (Elf_Shdr *s, struct image_target_desc *image_target) +{ + if (image_target->id != IMAGE_EFI + && grub_target_to_host32 (s->sh_type) != SHT_PROGBITS) + return 0; + return ((grub_target_to_host (s->sh_flags) & (SHF_EXECINSTR | SHF_ALLOC)) + == (SHF_EXECINSTR | SHF_ALLOC)); +} + +/* Determine if this section is a data section. This assumes that + BSS is also a data section, since the converter initializes BSS + when producing PE32 to avoid a bug in EFI implementations. */ +static int +SUFFIX (is_data_section) (Elf_Shdr *s, struct image_target_desc *image_target) +{ + if (image_target->id != IMAGE_EFI + && grub_target_to_host32 (s->sh_type) != SHT_PROGBITS) + return 0; + return ((grub_target_to_host (s->sh_flags) & (SHF_EXECINSTR | SHF_ALLOC)) + == SHF_ALLOC); +} + +/* Return if the ELF header is valid. */ +static int +SUFFIX (check_elf_header) (Elf_Ehdr *e, size_t size, struct image_target_desc *image_target) +{ + if (size < sizeof (*e) + || e->e_ident[EI_MAG0] != ELFMAG0 + || e->e_ident[EI_MAG1] != ELFMAG1 + || e->e_ident[EI_MAG2] != ELFMAG2 + || e->e_ident[EI_MAG3] != ELFMAG3 + || e->e_ident[EI_VERSION] != EV_CURRENT + || e->e_ident[EI_CLASS] != ELFCLASSXX + || e->e_version != grub_host_to_target32 (EV_CURRENT)) + return 0; + + return 1; +} + +/* Locate section addresses by merging code sections and data sections + into .text and .data, respectively. Return the array of section + addresses. */ +static Elf_Addr * +SUFFIX (locate_sections) (Elf_Shdr *sections, Elf_Half section_entsize, + Elf_Half num_sections, const char *strtab, + grub_size_t *exec_size, grub_size_t *kernel_sz, + grub_size_t *all_align, + struct image_target_desc *image_target) +{ + int i; + Elf_Addr current_address; + Elf_Addr *section_addresses; + Elf_Shdr *s; + + *all_align = 1; + + section_addresses = xmalloc (sizeof (*section_addresses) * num_sections); + memset (section_addresses, 0, sizeof (*section_addresses) * num_sections); + + current_address = 0; + + for (i = 0, s = sections; + i < num_sections; + i++, s = (Elf_Shdr *) ((char *) s + section_entsize)) + if ((grub_target_to_host (s->sh_flags) & SHF_ALLOC) + && grub_host_to_target32 (s->sh_addralign) > *all_align) + *all_align = grub_host_to_target32 (s->sh_addralign); + + + /* .text */ + for (i = 0, s = sections; + i < num_sections; + i++, s = (Elf_Shdr *) ((char *) s + section_entsize)) + if (SUFFIX (is_text_section) (s, image_target)) + { + Elf_Word align = grub_host_to_target_addr (s->sh_addralign); + const char *name = strtab + grub_host_to_target32 (s->sh_name); + if (align) + current_address = ALIGN_UP (current_address + image_target->vaddr_offset, + align) - image_target->vaddr_offset; + grub_util_info ("locating the section %s at 0x%x", + name, current_address); + section_addresses[i] = current_address; + current_address += grub_host_to_target_addr (s->sh_size); + } + + current_address = ALIGN_UP (current_address + image_target->vaddr_offset, + image_target->section_align) + - image_target->vaddr_offset; + *exec_size = current_address; + + /* .data */ + for (i = 0, s = sections; + i < num_sections; + i++, s = (Elf_Shdr *) ((char *) s + section_entsize)) + if (SUFFIX (is_data_section) (s, image_target)) + { + Elf_Word align = grub_host_to_target_addr (s->sh_addralign); + const char *name = strtab + grub_host_to_target32 (s->sh_name); + + if (align) + current_address = ALIGN_UP (current_address + image_target->vaddr_offset, + align) + - image_target->vaddr_offset; + + grub_util_info ("locating the section %s at 0x%x", + name, current_address); + section_addresses[i] = current_address; + current_address += grub_host_to_target_addr (s->sh_size); + } + + current_address = ALIGN_UP (current_address + image_target->vaddr_offset, + image_target->section_align) - image_target->vaddr_offset; + *kernel_sz = current_address; + return section_addresses; +} + +static char * +SUFFIX (load_image) (const char *kernel_path, grub_size_t *exec_size, + grub_size_t *kernel_sz, grub_size_t *bss_size, + grub_size_t total_module_size, grub_uint64_t *start, + void **reloc_section, grub_size_t *reloc_size, + grub_size_t *align, + struct image_target_desc *image_target) +{ + char *kernel_img, *out_img; + const char *strtab; + Elf_Ehdr *e; + Elf_Shdr *sections; + Elf_Addr *section_addresses; + Elf_Addr *section_vaddresses; + int i; + Elf_Shdr *s; + Elf_Half num_sections; + Elf_Off section_offset; + Elf_Half section_entsize; + grub_size_t kernel_size; + Elf_Shdr *symtab_section; + + *start = 0; + + kernel_size = grub_util_get_image_size (kernel_path); + kernel_img = xmalloc (kernel_size); + grub_util_load_image (kernel_path, kernel_img); + + e = (Elf_Ehdr *) kernel_img; + if (! SUFFIX (check_elf_header) (e, kernel_size, image_target)) + grub_util_error ("invalid ELF header"); + + section_offset = grub_target_to_host (e->e_shoff); + section_entsize = grub_target_to_host16 (e->e_shentsize); + num_sections = grub_target_to_host16 (e->e_shnum); + + if (kernel_size < section_offset + section_entsize * num_sections) + grub_util_error ("invalid ELF format"); + + sections = (Elf_Shdr *) (kernel_img + section_offset); + + /* Relocate sections then symbols in the virtual address space. */ + s = (Elf_Shdr *) ((char *) sections + + grub_host_to_target16 (e->e_shstrndx) * section_entsize); + strtab = (char *) e + grub_host_to_target_addr (s->sh_offset); + + section_addresses = SUFFIX (locate_sections) (sections, section_entsize, + num_sections, strtab, + exec_size, kernel_sz, align, + image_target); + + section_vaddresses = xmalloc (sizeof (*section_addresses) * num_sections); + + for (i = 0; i < num_sections; i++) + section_vaddresses[i] = section_addresses[i] + image_target->vaddr_offset; + + if (image_target->id != IMAGE_EFI) + { + Elf_Addr current_address = *kernel_sz; + + for (i = 0, s = sections; + i < num_sections; + i++, s = (Elf_Shdr *) ((char *) s + section_entsize)) + if (grub_target_to_host32 (s->sh_type) == SHT_NOBITS) + { + Elf_Word align = grub_host_to_target_addr (s->sh_addralign); + const char *name = strtab + grub_host_to_target32 (s->sh_name); + + if (align) + current_address = ALIGN_UP (current_address + + image_target->vaddr_offset, align) + - image_target->vaddr_offset; + + grub_util_info ("locating the section %s at 0x%x", + name, current_address); + section_vaddresses[i] = current_address + + image_target->vaddr_offset; + current_address += grub_host_to_target_addr (s->sh_size); + } + current_address = ALIGN_UP (current_address + image_target->vaddr_offset, + image_target->section_align) + - image_target->vaddr_offset; + *bss_size = current_address - *kernel_sz; + } + else + *bss_size = 0; + + if (image_target->id == IMAGE_EFI) + { + symtab_section = NULL; + for (i = 0, s = sections; + i < num_sections; + i++, s = (Elf_Shdr *) ((char *) s + section_entsize)) + if (s->sh_type == grub_host_to_target32 (SHT_SYMTAB)) + { + symtab_section = s; + break; + } + + if (! symtab_section) + grub_util_error ("no symbol table"); + + *start = SUFFIX (relocate_symbols) (e, sections, symtab_section, + section_vaddresses, section_entsize, + num_sections, image_target); + if (*start == 0) + grub_util_error ("start symbol is not defined"); + + /* Resolve addresses in the virtual address space. */ + SUFFIX (relocate_addresses) (e, sections, section_addresses, section_entsize, + num_sections, strtab, image_target); + + *reloc_size = SUFFIX (make_reloc_section) (e, reloc_section, + section_vaddresses, sections, + section_entsize, num_sections, + strtab, image_target); + } + else + { + *reloc_size = 0; + *reloc_section = NULL; + } + + out_img = xmalloc (*kernel_sz + total_module_size); + + for (i = 0, s = sections; + i < num_sections; + i++, s = (Elf_Shdr *) ((char *) s + section_entsize)) + if (SUFFIX (is_data_section) (s, image_target) + || SUFFIX (is_text_section) (s, image_target)) + { + if (grub_target_to_host32 (s->sh_type) == SHT_NOBITS) + memset (out_img + section_addresses[i], 0, + grub_host_to_target_addr (s->sh_size)); + else + memcpy (out_img + section_addresses[i], + kernel_img + grub_host_to_target_addr (s->sh_offset), + grub_host_to_target_addr (s->sh_size)); + } + free (kernel_img); + + return out_img; +} + + +#undef SUFFIX +#undef ELFCLASSXX +#undef Elf_Ehdr +#undef Elf_Phdr +#undef Elf_Shdr +#undef Elf_Addr +#undef Elf_Sym +#undef Elf_Off +#undef Elf_Rela +#undef Elf_Rel +#undef ELF_R_TYPE +#undef ELF_R_SYM |