# define ELFCLASSXX ELFCLASS32
# define Elf_Ehdr Elf32_Ehdr
# define Elf_Phdr Elf32_Phdr
+# define Elf_Shdr Elf32_Shdr
#elif defined(MULTIBOOT_LOAD_ELF64)
# define XX 64
# define E_MACHINE MULTIBOOT_ELF64_MACHINE
# define ELFCLASSXX ELFCLASS64
# define Elf_Ehdr Elf64_Ehdr
# define Elf_Phdr Elf64_Phdr
+# define Elf_Shdr Elf64_Shdr
#else
#error "I'm confused"
#endif
#define CONCAT(a,b) CONCAT_(a, b)
#define CONCAT_(a,b) a ## b
+#pragma GCC diagnostic ignored "-Wcast-align"
+
/* Check if BUFFER contains ELF32 (or ELF64). */
static int
CONCAT(grub_multiboot_is_elf, XX) (void *buffer)
}
static grub_err_t
-CONCAT(grub_multiboot_load_elf, XX) (grub_file_t file, void *buffer)
+CONCAT(grub_multiboot_load_elf, XX) (mbi_load_data_t *mld)
{
- Elf_Ehdr *ehdr = (Elf_Ehdr *) buffer;
+ Elf_Ehdr *ehdr = (Elf_Ehdr *) mld->buffer;
char *phdr_base;
+ grub_err_t err;
+ grub_relocator_chunk_t ch;
+ grub_uint32_t load_offset, load_size;
int i;
-
- if (ehdr->e_ident[EI_CLASS] != ELFCLASSXX)
- return grub_error (GRUB_ERR_UNKNOWN_OS, "invalid ELF class");
+ void *source;
if (ehdr->e_ident[EI_MAG0] != ELFMAG0
|| ehdr->e_ident[EI_MAG1] != ELFMAG1
|| ehdr->e_ident[EI_MAG2] != ELFMAG2
|| ehdr->e_ident[EI_MAG3] != ELFMAG3
- || ehdr->e_version != EV_CURRENT
- || ehdr->e_ident[EI_DATA] != ELFDATA2LSB
- || ehdr->e_machine != E_MACHINE)
- return grub_error(GRUB_ERR_UNKNOWN_OS, "no valid ELF header found");
+ || ehdr->e_ident[EI_DATA] != ELFDATA2LSB)
+ return grub_error(GRUB_ERR_UNKNOWN_OS, N_("invalid arch-independent ELF magic"));
+
+ if (ehdr->e_ident[EI_CLASS] != ELFCLASSXX || ehdr->e_machine != E_MACHINE
+ || ehdr->e_version != EV_CURRENT)
+ return grub_error (GRUB_ERR_UNKNOWN_OS, N_("invalid arch-dependent ELF magic"));
if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN)
- return grub_error (GRUB_ERR_UNKNOWN_OS, "invalid ELF file type");
+ return grub_error (GRUB_ERR_UNKNOWN_OS, N_("this ELF file is not of the right type"));
/* FIXME: Should we support program headers at strange locations? */
- if (ehdr->e_phoff + ehdr->e_phnum * ehdr->e_phentsize > MULTIBOOT_SEARCH)
+ if (ehdr->e_phoff + (grub_uint32_t) ehdr->e_phnum * ehdr->e_phentsize > MULTIBOOT_SEARCH)
return grub_error (GRUB_ERR_BAD_OS, "program header at a too high offset");
-#if defined (MULTIBOOT_LOAD_ELF64) && defined (__mips)
- /* We still in 32-bit mode. */
- if (ehdr->e_entry < 0xffffffff80000000ULL)
- return grub_error (GRUB_ERR_BAD_OS, "invalid entry point for ELF64");
-#else
- /* We still in 32-bit mode. */
- if (ehdr->e_entry > 0xffffffff)
- return grub_error (GRUB_ERR_BAD_OS, "invalid entry point for ELF64");
+ phdr_base = (char *) mld->buffer + ehdr->e_phoff;
+#define phdr(i) ((Elf_Phdr *) (phdr_base + (i) * ehdr->e_phentsize))
+
+ mld->link_base_addr = ~0;
+
+ /* Calculate lowest and highest load address. */
+ for (i = 0; i < ehdr->e_phnum; i++)
+ if (phdr(i)->p_type == PT_LOAD)
+ {
+ mld->link_base_addr = grub_min (mld->link_base_addr, phdr(i)->p_paddr);
+ highest_load = grub_max (highest_load, phdr(i)->p_paddr + phdr(i)->p_memsz);
+ }
+
+#ifdef MULTIBOOT_LOAD_ELF64
+ if (highest_load >= 0x100000000)
+ return grub_error (GRUB_ERR_BAD_OS, "segment crosses 4 GiB border");
#endif
- phdr_base = (char *) buffer + ehdr->e_phoff;
-#define phdr(i) ((Elf_Phdr *) (phdr_base + (i) * ehdr->e_phentsize))
+ load_size = highest_load - mld->link_base_addr;
+
+ if (mld->relocatable)
+ {
+ if (load_size > mld->max_addr || mld->min_addr > mld->max_addr - load_size)
+ return grub_error (GRUB_ERR_BAD_OS, "invalid min/max address and/or load size");
+
+ err = grub_relocator_alloc_chunk_align (grub_multiboot_relocator, &ch,
+ mld->min_addr, mld->max_addr - load_size,
+ load_size, mld->align ? mld->align : 1,
+ mld->preference, mld->avoid_efi_boot_services);
+ }
+ else
+ err = grub_relocator_alloc_chunk_addr (grub_multiboot_relocator, &ch,
+ mld->link_base_addr, load_size);
+
+ if (err)
+ {
+ grub_dprintf ("multiboot_loader", "Cannot allocate memory for OS image\n");
+ return err;
+ }
+
+ mld->load_base_addr = get_physical_target_address (ch);
+ source = get_virtual_current_address (ch);
+
+ grub_dprintf ("multiboot_loader", "link_base_addr=0x%x, load_base_addr=0x%x, "
+ "load_size=0x%x, relocatable=%d\n", mld->link_base_addr,
+ mld->load_base_addr, load_size, mld->relocatable);
+
+ if (mld->relocatable)
+ grub_dprintf ("multiboot_loader", "align=0x%lx, preference=0x%x, avoid_efi_boot_services=%d\n",
+ (long) mld->align, mld->preference, mld->avoid_efi_boot_services);
/* Load every loadable segment in memory. */
for (i = 0; i < ehdr->e_phnum; i++)
{
if (phdr(i)->p_type == PT_LOAD)
{
- grub_err_t err;
- void *source;
grub_dprintf ("multiboot_loader", "segment %d: paddr=0x%lx, memsz=0x%lx, vaddr=0x%lx\n",
i, (long) phdr(i)->p_paddr, (long) phdr(i)->p_memsz, (long) phdr(i)->p_vaddr);
- {
- grub_relocator_chunk_t ch;
- err = grub_relocator_alloc_chunk_addr (grub_multiboot_relocator,
- &ch, phdr(i)->p_paddr,
- phdr(i)->p_memsz);
- if (err)
- {
- grub_dprintf ("multiboot_loader", "Error loading phdr %d\n", i);
- return err;
- }
- source = get_virtual_current_address (ch);
- }
+ load_offset = phdr(i)->p_paddr - mld->link_base_addr;
if (phdr(i)->p_filesz != 0)
{
- if (grub_file_seek (file, (grub_off_t) phdr(i)->p_offset)
+ if (grub_file_seek (mld->file, (grub_off_t) phdr(i)->p_offset)
== (grub_off_t) -1)
- return grub_error (GRUB_ERR_BAD_OS,
- "invalid offset in program header");
+ return grub_errno;
- if (grub_file_read (file, source, phdr(i)->p_filesz)
+ if (grub_file_read (mld->file, (grub_uint8_t *) source + load_offset, phdr(i)->p_filesz)
!= (grub_ssize_t) phdr(i)->p_filesz)
- return grub_error (GRUB_ERR_BAD_OS,
- "couldn't read segment from file");
+ {
+ if (!grub_errno)
+ grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
+ mld->filename);
+ return grub_errno;
+ }
}
if (phdr(i)->p_filesz < phdr(i)->p_memsz)
- grub_memset ((grub_uint8_t *) source + phdr(i)->p_filesz, 0,
+ grub_memset ((grub_uint8_t *) source + load_offset + phdr(i)->p_filesz, 0,
phdr(i)->p_memsz - phdr(i)->p_filesz);
}
}
{
grub_multiboot_payload_eip = (ehdr->e_entry - phdr(i)->p_vaddr)
+ phdr(i)->p_paddr;
+#ifdef MULTIBOOT_LOAD_ELF64
+# ifdef __mips
+ /* We still in 32-bit mode. */
+ if ((ehdr->e_entry - phdr(i)->p_vaddr)
+ + phdr(i)->p_paddr < 0xffffffff80000000ULL)
+ return grub_error (GRUB_ERR_BAD_OS, "invalid entry point for ELF64");
+# else
+ /* We still in 32-bit mode. */
+ if ((ehdr->e_entry - phdr(i)->p_vaddr)
+ + phdr(i)->p_paddr > 0xffffffff)
+ return grub_error (GRUB_ERR_BAD_OS, "invalid entry point for ELF64");
+# endif
+#endif
break;
}
if (i == ehdr->e_phnum)
return grub_error (GRUB_ERR_BAD_OS, "entry point isn't in a segment");
+#if defined (__i386__) || defined (__x86_64__)
+
+#elif defined (__mips)
+ grub_multiboot_payload_eip |= 0x80000000;
+#else
+#error Please complete this
+#endif
+
if (ehdr->e_shnum)
{
grub_uint8_t *shdr, *shdrptr;
- shdr = grub_malloc (ehdr->e_shnum * ehdr->e_shentsize);
+ shdr = grub_malloc ((grub_uint32_t) ehdr->e_shnum * ehdr->e_shentsize);
if (!shdr)
return grub_errno;
- if (grub_file_seek (file, ehdr->e_shoff) == (grub_off_t) -1)
- return grub_error (GRUB_ERR_BAD_OS,
- "invalid offset to section headers");
+ if (grub_file_seek (mld->file, ehdr->e_shoff) == (grub_off_t) -1)
+ {
+ grub_free (shdr);
+ return grub_errno;
+ }
- if (grub_file_read (file, shdr, ehdr->e_shnum * ehdr->e_shentsize)
+ if (grub_file_read (mld->file, shdr, (grub_uint32_t) ehdr->e_shnum * ehdr->e_shentsize)
!= (grub_ssize_t) ehdr->e_shnum * ehdr->e_shentsize)
- return grub_error (GRUB_ERR_BAD_OS,
- "couldn't read sections headers from file");
+ {
+ if (!grub_errno)
+ grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
+ mld->filename);
+ return grub_errno;
+ }
for (shdrptr = shdr, i = 0; i < ehdr->e_shnum;
shdrptr += ehdr->e_shentsize, i++)
Elf_Shdr *sh = (Elf_Shdr *) shdrptr;
void *src;
grub_addr_t target;
- grub_err_t err;
+
+ if (mld->mbi_ver >= 2 && (sh->sh_type == SHT_REL || sh->sh_type == SHT_RELA))
+ return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "ELF files with relocs are not supported yet");
/* This section is a loaded section,
so we don't care. */
if (sh->sh_size == 0)
continue;
- {
- grub_relocator_chunk_t ch;
- err = grub_relocator_alloc_chunk_align (grub_multiboot_relocator,
- &ch, 0,
- (0xffffffff - sh->sh_size)
- + 1, sh->sh_size,
- sh->sh_addralign,
- GRUB_RELOCATOR_PREFERENCE_NONE);
- if (err)
- {
- grub_dprintf ("multiboot_loader", "Error loading shdr %d\n", i);
- return err;
- }
- src = get_virtual_current_address (ch);
- target = get_physical_target_address (ch);
- }
-
- if (grub_file_seek (file, sh->sh_offset) == (grub_off_t) -1)
- return grub_error (GRUB_ERR_BAD_OS,
- "invalid offset in section header");
-
- if (grub_file_read (file, src, sh->sh_size)
+ err = grub_relocator_alloc_chunk_align (grub_multiboot_relocator, &ch, 0,
+ (0xffffffff - sh->sh_size) + 1,
+ sh->sh_size, sh->sh_addralign,
+ GRUB_RELOCATOR_PREFERENCE_NONE,
+ mld->avoid_efi_boot_services);
+ if (err)
+ {
+ grub_dprintf ("multiboot_loader", "Error loading shdr %d\n", i);
+ return err;
+ }
+ src = get_virtual_current_address (ch);
+ target = get_physical_target_address (ch);
+
+ if (grub_file_seek (mld->file, sh->sh_offset) == (grub_off_t) -1)
+ return grub_errno;
+
+ if (grub_file_read (mld->file, src, sh->sh_size)
!= (grub_ssize_t) sh->sh_size)
- return grub_error (GRUB_ERR_BAD_OS,
- "couldn't read segment from file");
+ {
+ if (!grub_errno)
+ grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
+ mld->filename);
+ return grub_errno;
+ }
sh->sh_addr = target;
}
grub_multiboot_add_elfsyms (ehdr->e_shnum, ehdr->e_shentsize,
#undef ELFCLASSXX
#undef Elf_Ehdr
#undef Elf_Phdr
+#undef Elf_Shdr
projects / grub2.git / blobdiff