diff options
Diffstat (limited to 'bfd/elf32-i386.c')
| -rw-r--r-- | bfd/elf32-i386.c | 276 |
1 files changed, 144 insertions, 132 deletions
diff --git a/bfd/elf32-i386.c b/bfd/elf32-i386.c index cf4798e..59513e8 100644 --- a/bfd/elf32-i386.c +++ b/bfd/elf32-i386.c @@ -31,7 +31,11 @@ static void elf_i386_info_to_howto static void elf_i386_info_to_howto_rel PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); static boolean elf_i386_is_local_label_name PARAMS ((bfd *, const char *)); -static struct bfd_hash_entry *elf_i386_link_hash_newfunc +static boolean elf_i386_grok_prstatus + PARAMS ((bfd *abfd, Elf_Internal_Note *note)); +static boolean elf_i386_grok_psinfo + PARAMS ((bfd *abfd, Elf_Internal_Note *note)); +static struct bfd_hash_entry *link_hash_newfunc PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); static struct bfd_link_hash_table *elf_i386_link_hash_table_create PARAMS ((bfd *)); @@ -53,6 +57,8 @@ static boolean allocate_dynrelocs PARAMS ((struct elf_link_hash_entry *, PTR)); static boolean readonly_dynrelocs PARAMS ((struct elf_link_hash_entry *, PTR)); +static boolean elf_i386_fake_sections + PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *)); static boolean elf_i386_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); static boolean elf_i386_relocate_section @@ -61,16 +67,10 @@ static boolean elf_i386_relocate_section static boolean elf_i386_finish_dynamic_symbol PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, Elf_Internal_Sym *)); -static boolean elf_i386_finish_dynamic_sections - PARAMS ((bfd *, struct bfd_link_info *)); -static boolean elf_i386_fake_sections - PARAMS ((bfd *, Elf32_Internal_Shdr *, asection *)); static enum elf_reloc_type_class elf_i386_reloc_type_class PARAMS ((const Elf_Internal_Rela *)); -static boolean elf_i386_grok_prstatus - PARAMS ((bfd *abfd, Elf_Internal_Note *note)); -static boolean elf_i386_grok_psinfo - PARAMS ((bfd *abfd, Elf_Internal_Note *note)); +static boolean elf_i386_finish_dynamic_sections + PARAMS ((bfd *, struct bfd_link_info *)); #define USE_REL 1 /* 386 uses REL relocations instead of RELA */ @@ -315,7 +315,84 @@ elf_i386_is_local_label_name (abfd, name) return _bfd_elf_is_local_label_name (abfd, name); } -/* Functions for the i386 ELF linker. */ +/* Support for core dump NOTE sections. */ +static boolean +elf_i386_grok_prstatus (abfd, note) + bfd *abfd; + Elf_Internal_Note *note; +{ + int offset; + size_t raw_size; + + switch (note->descsz) + { + default: + return false; + + case 144: /* Linux/i386 */ + /* pr_cursig */ + elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); + + /* pr_pid */ + elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); + + /* pr_reg */ + offset = 72; + raw_size = 68; + + break; + } + + /* Make a ".reg/999" section. */ + return _bfd_elfcore_make_pseudosection (abfd, ".reg", + raw_size, note->descpos + offset); +} + +static boolean +elf_i386_grok_psinfo (abfd, note) + bfd *abfd; + Elf_Internal_Note *note; +{ + switch (note->descsz) + { + default: + return false; + + case 128: /* Linux/MIPS elf_prpsinfo */ + elf_tdata (abfd)->core_program + = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); + elf_tdata (abfd)->core_command + = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); + } + + /* Note that for some reason, a spurious space is tacked + onto the end of the args in some (at least one anyway) + implementations, so strip it off if it exists. */ + + { + char *command = elf_tdata (abfd)->core_command; + int n = strlen (command); + + if (0 < n && command[n - 1] == ' ') + command[n - 1] = '\0'; + } + + return true; +} + +/* Functions for the i386 ELF linker. + + In order to gain some understanding of code in this file without + knowing all the intricate details of the linker, note the + following: + + Functions named elf_i386_* are called by external routines, other + functions are only called locally. elf_i386_* functions appear + in this file more or less in the order in which they are called + from external routines. eg. elf_i386_check_relocs is called + early in the link process, elf_i386_finish_dynamic_sections is + one of the last functions. */ + /* The name of the dynamic interpreter. This is put in the .interp section. */ @@ -426,7 +503,7 @@ struct elf_i386_link_hash_table /* Create an entry in an i386 ELF linker hash table. */ static struct bfd_hash_entry * -elf_i386_link_hash_newfunc (entry, table, string) +link_hash_newfunc (entry, table, string) struct bfd_hash_entry *entry; struct bfd_hash_table *table; const char *string; @@ -468,8 +545,7 @@ elf_i386_link_hash_table_create (abfd) if (ret == (struct elf_i386_link_hash_table *) NULL) return NULL; - if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, - elf_i386_link_hash_newfunc)) + if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, link_hash_newfunc)) { bfd_release (abfd, ret); return NULL; @@ -1508,6 +1584,41 @@ elf_i386_size_dynamic_sections (output_bfd, info) return true; } +/* Set the correct type for an x86 ELF section. We do this by the + section name, which is a hack, but ought to work. */ + +static boolean +elf_i386_fake_sections (abfd, hdr, sec) + bfd *abfd ATTRIBUTE_UNUSED; + Elf32_Internal_Shdr *hdr; + asection *sec; +{ + register const char *name; + + name = bfd_get_section_name (abfd, sec); + + /* This is an ugly, but unfortunately necessary hack that is + needed when producing EFI binaries on x86. It tells + elf.c:elf_fake_sections() not to consider ".reloc" as a section + containing ELF relocation info. We need this hack in order to + be able to generate ELF binaries that can be translated into + EFI applications (which are essentially COFF objects). Those + files contain a COFF ".reloc" section inside an ELFNN object, + which would normally cause BFD to segfault because it would + attempt to interpret this section as containing relocation + entries for section "oc". With this hack enabled, ".reloc" + will be treated as a normal data section, which will avoid the + segfault. However, you won't be able to create an ELFNN binary + with a section named "oc" that needs relocations, but that's + the kind of ugly side-effects you get when detecting section + types based on their names... In practice, this limitation is + unlikely to bite. */ + if (strcmp (name, ".reloc") == 0) + hdr->sh_type = SHT_PROGBITS; + + return true; +} + /* Relocate an i386 ELF section. */ static boolean @@ -2096,6 +2207,26 @@ elf_i386_finish_dynamic_symbol (output_bfd, info, h, sym) return true; } +/* Used to decide how to sort relocs in an optimal manner for the + dynamic linker, before writing them out. */ + +static enum elf_reloc_type_class +elf_i386_reloc_type_class (rela) + const Elf_Internal_Rela *rela; +{ + switch ((int) ELF32_R_TYPE (rela->r_info)) + { + case R_386_RELATIVE: + return reloc_class_relative; + case R_386_JUMP_SLOT: + return reloc_class_plt; + case R_386_COPY: + return reloc_class_copy; + default: + return reloc_class_normal; + } +} + /* Finish up the dynamic sections. */ static boolean @@ -2218,125 +2349,6 @@ elf_i386_finish_dynamic_sections (output_bfd, info) return true; } -/* Set the correct type for an x86 ELF section. We do this by the - section name, which is a hack, but ought to work. */ - -static boolean -elf_i386_fake_sections (abfd, hdr, sec) - bfd *abfd ATTRIBUTE_UNUSED; - Elf32_Internal_Shdr *hdr; - asection *sec; -{ - register const char *name; - - name = bfd_get_section_name (abfd, sec); - - if (strcmp (name, ".reloc") == 0) - /* - * This is an ugly, but unfortunately necessary hack that is - * needed when producing EFI binaries on x86. It tells - * elf.c:elf_fake_sections() not to consider ".reloc" as a section - * containing ELF relocation info. We need this hack in order to - * be able to generate ELF binaries that can be translated into - * EFI applications (which are essentially COFF objects). Those - * files contain a COFF ".reloc" section inside an ELFNN object, - * which would normally cause BFD to segfault because it would - * attempt to interpret this section as containing relocation - * entries for section "oc". With this hack enabled, ".reloc" - * will be treated as a normal data section, which will avoid the - * segfault. However, you won't be able to create an ELFNN binary - * with a section named "oc" that needs relocations, but that's - * the kind of ugly side-effects you get when detecting section - * types based on their names... In practice, this limitation is - * unlikely to bite. - */ - hdr->sh_type = SHT_PROGBITS; - - return true; -} - -static enum elf_reloc_type_class -elf_i386_reloc_type_class (rela) - const Elf_Internal_Rela *rela; -{ - switch ((int) ELF32_R_TYPE (rela->r_info)) - { - case R_386_RELATIVE: - return reloc_class_relative; - case R_386_JUMP_SLOT: - return reloc_class_plt; - case R_386_COPY: - return reloc_class_copy; - default: - return reloc_class_normal; - } -} - -/* Support for core dump NOTE sections */ -static boolean -elf_i386_grok_prstatus (abfd, note) - bfd *abfd; - Elf_Internal_Note *note; -{ - int offset; - size_t raw_size; - - switch (note->descsz) - { - default: - return false; - - case 144: /* Linux/i386 */ - /* pr_cursig */ - elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); - - /* pr_pid */ - elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); - - /* pr_reg */ - offset = 72; - raw_size = 68; - - break; - } - - /* Make a ".reg/999" section. */ - return _bfd_elfcore_make_pseudosection (abfd, ".reg", - raw_size, note->descpos + offset); -} - -static boolean -elf_i386_grok_psinfo (abfd, note) - bfd *abfd; - Elf_Internal_Note *note; -{ - switch (note->descsz) - { - default: - return false; - - case 128: /* Linux/MIPS elf_prpsinfo */ - elf_tdata (abfd)->core_program - = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16); - elf_tdata (abfd)->core_command - = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80); - } - - /* Note that for some reason, a spurious space is tacked - onto the end of the args in some (at least one anyway) - implementations, so strip it off if it exists. */ - - { - char *command = elf_tdata (abfd)->core_command; - int n = strlen (command); - - if (0 < n && command[n - 1] == ' ') - command[n - 1] = '\0'; - } - - return true; -} - #define TARGET_LITTLE_SYM bfd_elf32_i386_vec #define TARGET_LITTLE_NAME "elf32-i386" #define ELF_ARCH bfd_arch_i386 |