diff options
Diffstat (limited to 'binutils-2.25/bfd/elfcode.h')
| -rw-r--r-- | binutils-2.25/bfd/elfcode.h | 1870 |
1 files changed, 1870 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elfcode.h b/binutils-2.25/bfd/elfcode.h new file mode 100644 index 00000000..e296c5ce --- /dev/null +++ b/binutils-2.25/bfd/elfcode.h @@ -0,0 +1,1870 @@ +/* ELF executable support for BFD. + Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, + 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 + Free Software Foundation, Inc. + + Written by Fred Fish @ Cygnus Support, from information published + in "UNIX System V Release 4, Programmers Guide: ANSI C and + Programming Support Tools". Sufficient support for gdb. + + Rewritten by Mark Eichin @ Cygnus Support, from information + published in "System V Application Binary Interface", chapters 4 + and 5, as well as the various "Processor Supplement" documents + derived from it. Added support for assembler and other object file + utilities. Further work done by Ken Raeburn (Cygnus Support), Michael + Meissner (Open Software Foundation), and Peter Hoogenboom (University + of Utah) to finish and extend this. + + This file is part of BFD, the Binary File Descriptor library. + + This program 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. + + This program 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 this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + + +/* Problems and other issues to resolve. + + (1) BFD expects there to be some fixed number of "sections" in + the object file. I.E. there is a "section_count" variable in the + bfd structure which contains the number of sections. However, ELF + supports multiple "views" of a file. In particular, with current + implementations, executable files typically have two tables, a + program header table and a section header table, both of which + partition the executable. + + In ELF-speak, the "linking view" of the file uses the section header + table to access "sections" within the file, and the "execution view" + uses the program header table to access "segments" within the file. + "Segments" typically may contain all the data from one or more + "sections". + + Note that the section header table is optional in ELF executables, + but it is this information that is most useful to gdb. If the + section header table is missing, then gdb should probably try + to make do with the program header table. (FIXME) + + (2) The code in this file is compiled twice, once in 32-bit mode and + once in 64-bit mode. More of it should be made size-independent + and moved into elf.c. + + (3) ELF section symbols are handled rather sloppily now. This should + be cleaned up, and ELF section symbols reconciled with BFD section + symbols. + + (4) We need a published spec for 64-bit ELF. We've got some stuff here + that we're using for SPARC V9 64-bit chips, but don't assume that + it's cast in stone. + */ + +#include "sysdep.h" +#include "bfd.h" +#include "libiberty.h" +#include "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" + +/* Renaming structures, typedefs, macros and functions to be size-specific. */ +#define Elf_External_Ehdr NAME(Elf,External_Ehdr) +#define Elf_External_Sym NAME(Elf,External_Sym) +#define Elf_External_Shdr NAME(Elf,External_Shdr) +#define Elf_External_Phdr NAME(Elf,External_Phdr) +#define Elf_External_Rel NAME(Elf,External_Rel) +#define Elf_External_Rela NAME(Elf,External_Rela) +#define Elf_External_Dyn NAME(Elf,External_Dyn) + +#define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command) +#define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal) +#define elf_core_file_matches_executable_p \ + NAME(bfd_elf,core_file_matches_executable_p) +#define elf_core_file_pid NAME(bfd_elf,core_file_pid) +#define elf_object_p NAME(bfd_elf,object_p) +#define elf_core_file_p NAME(bfd_elf,core_file_p) +#define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound) +#define elf_get_dynamic_symtab_upper_bound \ + NAME(bfd_elf,get_dynamic_symtab_upper_bound) +#define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in) +#define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in) +#define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out) +#define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out) +#define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in) +#define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out) +#define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in) +#define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out) +#define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in) +#define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out) +#define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound) +#define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc) +#define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table) +#define elf_canonicalize_symtab NAME(bfd_elf,canonicalize_symtab) +#define elf_canonicalize_dynamic_symtab \ + NAME(bfd_elf,canonicalize_dynamic_symtab) +#define elf_get_synthetic_symtab \ + NAME(bfd_elf,get_synthetic_symtab) +#define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol) +#define elf_get_symbol_info NAME(bfd_elf,get_symbol_info) +#define elf_get_lineno NAME(bfd_elf,get_lineno) +#define elf_set_arch_mach NAME(bfd_elf,set_arch_mach) +#define elf_find_nearest_line NAME(bfd_elf,find_nearest_line) +#define elf_sizeof_headers NAME(bfd_elf,sizeof_headers) +#define elf_set_section_contents NAME(bfd_elf,set_section_contents) +#define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto) +#define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel) +#define elf_find_section NAME(bfd_elf,find_section) +#define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr) +#define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs) +#define elf_checksum_contents NAME(bfd_elf,checksum_contents) +#define elf_write_relocs NAME(bfd_elf,write_relocs) +#define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table) + +#if ARCH_SIZE == 64 +#define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y) +#define ELF_R_SYM(X) ELF64_R_SYM(X) +#define ELF_R_TYPE(X) ELF64_R_TYPE(X) +#define ELFCLASS ELFCLASS64 +#define FILE_ALIGN 8 +#define LOG_FILE_ALIGN 3 +#endif +#if ARCH_SIZE == 32 +#define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y) +#define ELF_R_SYM(X) ELF32_R_SYM(X) +#define ELF_R_TYPE(X) ELF32_R_TYPE(X) +#define ELFCLASS ELFCLASS32 +#define FILE_ALIGN 4 +#define LOG_FILE_ALIGN 2 +#endif + +#if DEBUG & 2 +static void elf_debug_section (int, Elf_Internal_Shdr *); +#endif +#if DEBUG & 1 +static void elf_debug_file (Elf_Internal_Ehdr *); +#endif + +/* Structure swapping routines */ + +/* Should perhaps use put_offset, put_word, etc. For now, the two versions + can be handled by explicitly specifying 32 bits or "the long type". */ +#if ARCH_SIZE == 64 +#define H_PUT_WORD H_PUT_64 +#define H_PUT_SIGNED_WORD H_PUT_S64 +#define H_GET_WORD H_GET_64 +#define H_GET_SIGNED_WORD H_GET_S64 +#endif +#if ARCH_SIZE == 32 +#define H_PUT_WORD H_PUT_32 +#define H_PUT_SIGNED_WORD H_PUT_S32 +#define H_GET_WORD H_GET_32 +#define H_GET_SIGNED_WORD H_GET_S32 +#endif + +/* Translate an ELF symbol in external format into an ELF symbol in internal + format. */ + +bfd_boolean +elf_swap_symbol_in (bfd *abfd, + const void *psrc, + const void *pshn, + Elf_Internal_Sym *dst) +{ + const Elf_External_Sym *src = (const Elf_External_Sym *) psrc; + const Elf_External_Sym_Shndx *shndx = (const Elf_External_Sym_Shndx *) pshn; + int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; + + dst->st_name = H_GET_32 (abfd, src->st_name); + if (signed_vma) + dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value); + else + dst->st_value = H_GET_WORD (abfd, src->st_value); + dst->st_size = H_GET_WORD (abfd, src->st_size); + dst->st_info = H_GET_8 (abfd, src->st_info); + dst->st_other = H_GET_8 (abfd, src->st_other); + dst->st_shndx = H_GET_16 (abfd, src->st_shndx); + if (dst->st_shndx == (SHN_XINDEX & 0xffff)) + { + if (shndx == NULL) + return FALSE; + dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx); + } + else if (dst->st_shndx >= (SHN_LORESERVE & 0xffff)) + dst->st_shndx += SHN_LORESERVE - (SHN_LORESERVE & 0xffff); + dst->st_target_internal = 0; + return TRUE; +} + +/* Translate an ELF symbol in internal format into an ELF symbol in external + format. */ + +void +elf_swap_symbol_out (bfd *abfd, + const Elf_Internal_Sym *src, + void *cdst, + void *shndx) +{ + unsigned int tmp; + Elf_External_Sym *dst = (Elf_External_Sym *) cdst; + H_PUT_32 (abfd, src->st_name, dst->st_name); + H_PUT_WORD (abfd, src->st_value, dst->st_value); + H_PUT_WORD (abfd, src->st_size, dst->st_size); + H_PUT_8 (abfd, src->st_info, dst->st_info); + H_PUT_8 (abfd, src->st_other, dst->st_other); + tmp = src->st_shndx; + if (tmp >= (SHN_LORESERVE & 0xffff) && tmp < SHN_LORESERVE) + { + if (shndx == NULL) + abort (); + H_PUT_32 (abfd, tmp, shndx); + tmp = SHN_XINDEX & 0xffff; + } + H_PUT_16 (abfd, tmp, dst->st_shndx); +} + +/* Translate an ELF file header in external format into an ELF file header in + internal format. */ + +static void +elf_swap_ehdr_in (bfd *abfd, + const Elf_External_Ehdr *src, + Elf_Internal_Ehdr *dst) +{ + int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; + memcpy (dst->e_ident, src->e_ident, EI_NIDENT); + dst->e_type = H_GET_16 (abfd, src->e_type); + dst->e_machine = H_GET_16 (abfd, src->e_machine); + dst->e_version = H_GET_32 (abfd, src->e_version); + if (signed_vma) + dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry); + else + dst->e_entry = H_GET_WORD (abfd, src->e_entry); + dst->e_phoff = H_GET_WORD (abfd, src->e_phoff); + dst->e_shoff = H_GET_WORD (abfd, src->e_shoff); + dst->e_flags = H_GET_32 (abfd, src->e_flags); + dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize); + dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize); + dst->e_phnum = H_GET_16 (abfd, src->e_phnum); + dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize); + dst->e_shnum = H_GET_16 (abfd, src->e_shnum); + dst->e_shstrndx = H_GET_16 (abfd, src->e_shstrndx); +} + +/* Translate an ELF file header in internal format into an ELF file header in + external format. */ + +static void +elf_swap_ehdr_out (bfd *abfd, + const Elf_Internal_Ehdr *src, + Elf_External_Ehdr *dst) +{ + unsigned int tmp; + int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; + memcpy (dst->e_ident, src->e_ident, EI_NIDENT); + /* note that all elements of dst are *arrays of unsigned char* already... */ + H_PUT_16 (abfd, src->e_type, dst->e_type); + H_PUT_16 (abfd, src->e_machine, dst->e_machine); + H_PUT_32 (abfd, src->e_version, dst->e_version); + if (signed_vma) + H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry); + else + H_PUT_WORD (abfd, src->e_entry, dst->e_entry); + H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff); + H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff); + H_PUT_32 (abfd, src->e_flags, dst->e_flags); + H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize); + H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize); + tmp = src->e_phnum; + if (tmp > PN_XNUM) + tmp = PN_XNUM; + H_PUT_16 (abfd, tmp, dst->e_phnum); + H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize); + tmp = src->e_shnum; + if (tmp >= (SHN_LORESERVE & 0xffff)) + tmp = SHN_UNDEF; + H_PUT_16 (abfd, tmp, dst->e_shnum); + tmp = src->e_shstrndx; + if (tmp >= (SHN_LORESERVE & 0xffff)) + tmp = SHN_XINDEX & 0xffff; + H_PUT_16 (abfd, tmp, dst->e_shstrndx); +} + +/* Translate an ELF section header table entry in external format into an + ELF section header table entry in internal format. */ + +static void +elf_swap_shdr_in (bfd *abfd, + const Elf_External_Shdr *src, + Elf_Internal_Shdr *dst) +{ + int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; + + dst->sh_name = H_GET_32 (abfd, src->sh_name); + dst->sh_type = H_GET_32 (abfd, src->sh_type); + dst->sh_flags = H_GET_WORD (abfd, src->sh_flags); + if (signed_vma) + dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr); + else + dst->sh_addr = H_GET_WORD (abfd, src->sh_addr); + dst->sh_offset = H_GET_WORD (abfd, src->sh_offset); + dst->sh_size = H_GET_WORD (abfd, src->sh_size); + dst->sh_link = H_GET_32 (abfd, src->sh_link); + dst->sh_info = H_GET_32 (abfd, src->sh_info); + dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign); + dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize); + dst->bfd_section = NULL; + dst->contents = NULL; +} + +/* Translate an ELF section header table entry in internal format into an + ELF section header table entry in external format. */ + +static void +elf_swap_shdr_out (bfd *abfd, + const Elf_Internal_Shdr *src, + Elf_External_Shdr *dst) +{ + /* note that all elements of dst are *arrays of unsigned char* already... */ + H_PUT_32 (abfd, src->sh_name, dst->sh_name); + H_PUT_32 (abfd, src->sh_type, dst->sh_type); + H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags); + H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr); + H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset); + H_PUT_WORD (abfd, src->sh_size, dst->sh_size); + H_PUT_32 (abfd, src->sh_link, dst->sh_link); + H_PUT_32 (abfd, src->sh_info, dst->sh_info); + H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign); + H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize); +} + +/* Translate an ELF program header table entry in external format into an + ELF program header table entry in internal format. */ + +void +elf_swap_phdr_in (bfd *abfd, + const Elf_External_Phdr *src, + Elf_Internal_Phdr *dst) +{ + int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; + + dst->p_type = H_GET_32 (abfd, src->p_type); + dst->p_flags = H_GET_32 (abfd, src->p_flags); + dst->p_offset = H_GET_WORD (abfd, src->p_offset); + if (signed_vma) + { + dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr); + dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr); + } + else + { + dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr); + dst->p_paddr = H_GET_WORD (abfd, src->p_paddr); + } + dst->p_filesz = H_GET_WORD (abfd, src->p_filesz); + dst->p_memsz = H_GET_WORD (abfd, src->p_memsz); + dst->p_align = H_GET_WORD (abfd, src->p_align); +} + +void +elf_swap_phdr_out (bfd *abfd, + const Elf_Internal_Phdr *src, + Elf_External_Phdr *dst) +{ + const struct elf_backend_data *bed; + bfd_vma p_paddr; + + bed = get_elf_backend_data (abfd); + p_paddr = bed->want_p_paddr_set_to_zero ? 0 : src->p_paddr; + + /* note that all elements of dst are *arrays of unsigned char* already... */ + H_PUT_32 (abfd, src->p_type, dst->p_type); + H_PUT_WORD (abfd, src->p_offset, dst->p_offset); + H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr); + H_PUT_WORD (abfd, p_paddr, dst->p_paddr); + H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz); + H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz); + H_PUT_32 (abfd, src->p_flags, dst->p_flags); + H_PUT_WORD (abfd, src->p_align, dst->p_align); +} + +/* Translate an ELF reloc from external format to internal format. */ +void +elf_swap_reloc_in (bfd *abfd, + const bfd_byte *s, + Elf_Internal_Rela *dst) +{ + const Elf_External_Rel *src = (const Elf_External_Rel *) s; + dst->r_offset = H_GET_WORD (abfd, src->r_offset); + dst->r_info = H_GET_WORD (abfd, src->r_info); + dst->r_addend = 0; +} + +void +elf_swap_reloca_in (bfd *abfd, + const bfd_byte *s, + Elf_Internal_Rela *dst) +{ + const Elf_External_Rela *src = (const Elf_External_Rela *) s; + dst->r_offset = H_GET_WORD (abfd, src->r_offset); + dst->r_info = H_GET_WORD (abfd, src->r_info); + dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend); +} + +/* Translate an ELF reloc from internal format to external format. */ +void +elf_swap_reloc_out (bfd *abfd, + const Elf_Internal_Rela *src, + bfd_byte *d) +{ + Elf_External_Rel *dst = (Elf_External_Rel *) d; + H_PUT_WORD (abfd, src->r_offset, dst->r_offset); + H_PUT_WORD (abfd, src->r_info, dst->r_info); +} + +void +elf_swap_reloca_out (bfd *abfd, + const Elf_Internal_Rela *src, + bfd_byte *d) +{ + Elf_External_Rela *dst = (Elf_External_Rela *) d; + H_PUT_WORD (abfd, src->r_offset, dst->r_offset); + H_PUT_WORD (abfd, src->r_info, dst->r_info); + H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend); +} + +void +elf_swap_dyn_in (bfd *abfd, + const void *p, + Elf_Internal_Dyn *dst) +{ + const Elf_External_Dyn *src = (const Elf_External_Dyn *) p; + + dst->d_tag = H_GET_WORD (abfd, src->d_tag); + dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val); +} + +void +elf_swap_dyn_out (bfd *abfd, + const Elf_Internal_Dyn *src, + void *p) +{ + Elf_External_Dyn *dst = (Elf_External_Dyn *) p; + + H_PUT_WORD (abfd, src->d_tag, dst->d_tag); + H_PUT_WORD (abfd, src->d_un.d_val, dst->d_un.d_val); +} + +/* ELF .o/exec file reading */ + +/* Begin processing a given object. + + First we validate the file by reading in the ELF header and checking + the magic number. */ + +static inline bfd_boolean +elf_file_p (Elf_External_Ehdr *x_ehdrp) +{ + return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0) + && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1) + && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2) + && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3)); +} + +/* Check to see if the file associated with ABFD matches the target vector + that ABFD points to. + + Note that we may be called several times with the same ABFD, but different + target vectors, most of which will not match. We have to avoid leaving + any side effects in ABFD, or any data it points to (like tdata), if the + file does not match the target vector. */ + +const bfd_target * +elf_object_p (bfd *abfd) +{ + Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ + Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ + Elf_External_Shdr x_shdr; /* Section header table entry, external form */ + Elf_Internal_Shdr i_shdr; + Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ + unsigned int shindex; + const struct elf_backend_data *ebd; + asection *s; + bfd_size_type amt; + const bfd_target *target; + + /* Read in the ELF header in external format. */ + + if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr)) + { + if (bfd_get_error () != bfd_error_system_call) + goto got_wrong_format_error; + else + goto got_no_match; + } + + /* Now check to see if we have a valid ELF file, and one that BFD can + make use of. The magic number must match, the address size ('class') + and byte-swapping must match our XVEC entry, and it must have a + section header table (FIXME: See comments re sections at top of this + file). */ + + if (! elf_file_p (&x_ehdr) + || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT + || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) + goto got_wrong_format_error; + + /* Check that file's byte order matches xvec's */ + switch (x_ehdr.e_ident[EI_DATA]) + { + case ELFDATA2MSB: /* Big-endian */ + if (! bfd_header_big_endian (abfd)) + goto got_wrong_format_error; + break; + case ELFDATA2LSB: /* Little-endian */ + if (! bfd_header_little_endian (abfd)) + goto got_wrong_format_error; + break; + case ELFDATANONE: /* No data encoding specified */ + default: /* Unknown data encoding specified */ + goto got_wrong_format_error; + } + + target = abfd->xvec; + + /* Allocate an instance of the elf_obj_tdata structure and hook it up to + the tdata pointer in the bfd. */ + + if (! (*target->_bfd_set_format[bfd_object]) (abfd)) + goto got_no_match; + + /* Now that we know the byte order, swap in the rest of the header */ + i_ehdrp = elf_elfheader (abfd); + elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); +#if DEBUG & 1 + elf_debug_file (i_ehdrp); +#endif + + /* Reject ET_CORE (header indicates core file, not object file) */ + if (i_ehdrp->e_type == ET_CORE) + goto got_wrong_format_error; + + /* If this is a relocatable file and there is no section header + table, then we're hosed. */ + if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL) + goto got_wrong_format_error; + + /* As a simple sanity check, verify that what BFD thinks is the + size of each section header table entry actually matches the size + recorded in the file, but only if there are any sections. */ + if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0) + goto got_wrong_format_error; + + /* Further sanity check. */ + if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_shnum != 0) + goto got_wrong_format_error; + + ebd = get_elf_backend_data (abfd); + if (ebd->s->arch_size != ARCH_SIZE) + goto got_wrong_format_error; + + /* Check that the ELF e_machine field matches what this particular + BFD format expects. */ + if (ebd->elf_machine_code != i_ehdrp->e_machine + && (ebd->elf_machine_alt1 == 0 + || i_ehdrp->e_machine != ebd->elf_machine_alt1) + && (ebd->elf_machine_alt2 == 0 + || i_ehdrp->e_machine != ebd->elf_machine_alt2) + && ebd->elf_machine_code != EM_NONE) + goto got_wrong_format_error; + + if (i_ehdrp->e_type == ET_EXEC) + abfd->flags |= EXEC_P; + else if (i_ehdrp->e_type == ET_DYN) + abfd->flags |= DYNAMIC; + + if (i_ehdrp->e_phnum > 0) + abfd->flags |= D_PAGED; + + if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) + { + /* It's OK if this fails for the generic target. */ + if (ebd->elf_machine_code != EM_NONE) + goto got_no_match; + } + + if (ebd->elf_machine_code != EM_NONE + && i_ehdrp->e_ident[EI_OSABI] != ebd->elf_osabi + && ebd->elf_osabi != ELFOSABI_NONE) + goto got_wrong_format_error; + + if (i_ehdrp->e_shoff != 0) + { + bfd_signed_vma where = i_ehdrp->e_shoff; + + if (where != (file_ptr) where) + goto got_wrong_format_error; + + /* Seek to the section header table in the file. */ + if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) + goto got_no_match; + + /* Read the first section header at index 0, and convert to internal + form. */ + if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) + goto got_no_match; + elf_swap_shdr_in (abfd, &x_shdr, &i_shdr); + + /* If the section count is zero, the actual count is in the first + section header. */ + if (i_ehdrp->e_shnum == SHN_UNDEF) + { + i_ehdrp->e_shnum = i_shdr.sh_size; + if (i_ehdrp->e_shnum >= SHN_LORESERVE + || i_ehdrp->e_shnum != i_shdr.sh_size + || i_ehdrp->e_shnum == 0) + goto got_wrong_format_error; + } + + /* And similarly for the string table index. */ + if (i_ehdrp->e_shstrndx == (SHN_XINDEX & 0xffff)) + { + i_ehdrp->e_shstrndx = i_shdr.sh_link; + if (i_ehdrp->e_shstrndx != i_shdr.sh_link) + goto got_wrong_format_error; + } + + /* And program headers. */ + if (i_ehdrp->e_phnum == PN_XNUM && i_shdr.sh_info != 0) + { + i_ehdrp->e_phnum = i_shdr.sh_info; + if (i_ehdrp->e_phnum != i_shdr.sh_info) + goto got_wrong_format_error; + } + + /* Sanity check that we can read all of the section headers. + It ought to be good enough to just read the last one. */ + if (i_ehdrp->e_shnum != 1) + { + /* Check that we don't have a totally silly number of sections. */ + if (i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (x_shdr) + || i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (i_shdr)) + goto got_wrong_format_error; + + where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr); + if (where != (file_ptr) where) + goto got_wrong_format_error; + if ((bfd_size_type) where <= i_ehdrp->e_shoff) + goto got_wrong_format_error; + + if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) + goto got_no_match; + if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) + goto got_no_match; + + /* Back to where we were. */ + where = i_ehdrp->e_shoff + sizeof (x_shdr); + if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) + goto got_no_match; + } + } + + /* Allocate space for a copy of the section header table in + internal form. */ + if (i_ehdrp->e_shnum != 0) + { + Elf_Internal_Shdr *shdrp; + unsigned int num_sec; + + amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum; + i_shdrp = (Elf_Internal_Shdr *) bfd_alloc (abfd, amt); + if (!i_shdrp) + goto got_no_match; + num_sec = i_ehdrp->e_shnum; + elf_numsections (abfd) = num_sec; + amt = sizeof (i_shdrp) * num_sec; + elf_elfsections (abfd) = (Elf_Internal_Shdr **) bfd_alloc (abfd, amt); + if (!elf_elfsections (abfd)) + goto got_no_match; + + memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp)); + for (shdrp = i_shdrp, shindex = 0; shindex < num_sec; shindex++) + elf_elfsections (abfd)[shindex] = shdrp++; + + /* Read in the rest of the section header table and convert it + to internal form. */ + for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++) + { + if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) + goto got_no_match; + elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); + + /* Sanity check sh_link and sh_info. */ + if (i_shdrp[shindex].sh_link >= num_sec) + { + /* PR 10478: Accept Solaris binaries with a sh_link + field set to SHN_BEFORE or SHN_AFTER. */ + switch (ebd->elf_machine_code) + { + case EM_386: + case EM_486: + case EM_X86_64: + case EM_OLD_SPARCV9: + case EM_SPARC32PLUS: + case EM_SPARCV9: + case EM_SPARC: + if (i_shdrp[shindex].sh_link == (SHN_LORESERVE & 0xffff) /* SHN_BEFORE */ + || i_shdrp[shindex].sh_link == ((SHN_LORESERVE + 1) & 0xffff) /* SHN_AFTER */) + break; + /* Otherwise fall through. */ + default: + goto got_wrong_format_error; + } + } + + if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK) + || i_shdrp[shindex].sh_type == SHT_RELA + || i_shdrp[shindex].sh_type == SHT_REL) + && i_shdrp[shindex].sh_info >= num_sec) + goto got_wrong_format_error; + + /* If the section is loaded, but not page aligned, clear + D_PAGED. */ + if (i_shdrp[shindex].sh_size != 0 + && (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0 + && i_shdrp[shindex].sh_type != SHT_NOBITS + && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset) + % ebd->minpagesize) + != 0)) + abfd->flags &= ~D_PAGED; + } + } + + /* A further sanity check. */ + if (i_ehdrp->e_shnum != 0) + { + if (i_ehdrp->e_shstrndx >= elf_numsections (abfd)) + { + /* PR 2257: + We used to just goto got_wrong_format_error here + but there are binaries in existance for which this test + will prevent the binutils from working with them at all. + So we are kind, and reset the string index value to 0 + so that at least some processing can be done. */ + i_ehdrp->e_shstrndx = SHN_UNDEF; + _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd->filename); + } + } + else if (i_ehdrp->e_shstrndx != SHN_UNDEF) + goto got_wrong_format_error; + + /* Read in the program headers. */ + if (i_ehdrp->e_phnum == 0) + elf_tdata (abfd)->phdr = NULL; + else + { + Elf_Internal_Phdr *i_phdr; + unsigned int i; + + amt = i_ehdrp->e_phnum * sizeof (Elf_Internal_Phdr); + elf_tdata (abfd)->phdr = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); + if (elf_tdata (abfd)->phdr == NULL) + goto got_no_match; + if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) + goto got_no_match; + i_phdr = elf_tdata (abfd)->phdr; + for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++) + { + Elf_External_Phdr x_phdr; + + if (bfd_bread (&x_phdr, sizeof x_phdr, abfd) != sizeof x_phdr) + goto got_no_match; + elf_swap_phdr_in (abfd, &x_phdr, i_phdr); + } + } + + if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff != 0) + { + unsigned int num_sec; + + /* Once all of the section headers have been read and converted, we + can start processing them. Note that the first section header is + a dummy placeholder entry, so we ignore it. */ + num_sec = elf_numsections (abfd); + for (shindex = 1; shindex < num_sec; shindex++) + if (!bfd_section_from_shdr (abfd, shindex)) + goto got_no_match; + + /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */ + if (! _bfd_elf_setup_sections (abfd)) + goto got_wrong_format_error; + } + + /* Let the backend double check the format and override global + information. */ + if (ebd->elf_backend_object_p) + { + if (! (*ebd->elf_backend_object_p) (abfd)) + goto got_wrong_format_error; + } + + /* Remember the entry point specified in the ELF file header. */ + bfd_set_start_address (abfd, i_ehdrp->e_entry); + + /* If we have created any reloc sections that are associated with + debugging sections, mark the reloc sections as debugging as well. */ + for (s = abfd->sections; s != NULL; s = s->next) + { + if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL + || elf_section_data (s)->this_hdr.sh_type == SHT_RELA) + && elf_section_data (s)->this_hdr.sh_info > 0) + { + unsigned long targ_index; + asection *targ_sec; + + targ_index = elf_section_data (s)->this_hdr.sh_info; + targ_sec = bfd_section_from_elf_index (abfd, targ_index); + if (targ_sec != NULL + && (targ_sec->flags & SEC_DEBUGGING) != 0) + s->flags |= SEC_DEBUGGING; + } + } + return target; + + got_wrong_format_error: + bfd_set_error (bfd_error_wrong_format); + + got_no_match: + return NULL; +} + +/* ELF .o/exec file writing */ + +/* Write out the relocs. */ + +void +elf_write_relocs (bfd *abfd, asection *sec, void *data) +{ + bfd_boolean *failedp = (bfd_boolean *) data; + Elf_Internal_Shdr *rela_hdr; + bfd_vma addr_offset; + void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); + size_t extsize; + bfd_byte *dst_rela; + unsigned int idx; + asymbol *last_sym; + int last_sym_idx; + + /* If we have already failed, don't do anything. */ + if (*failedp) + return; + + if ((sec->flags & SEC_RELOC) == 0) + return; + + /* The linker backend writes the relocs out itself, and sets the + reloc_count field to zero to inhibit writing them here. Also, + sometimes the SEC_RELOC flag gets set even when there aren't any + relocs. */ + if (sec->reloc_count == 0) + return; + + /* If we have opened an existing file for update, reloc_count may be + set even though we are not linking. In that case we have nothing + to do. */ + if (sec->orelocation == NULL) + return; + + rela_hdr = elf_section_data (sec)->rela.hdr; + if (rela_hdr == NULL) + rela_hdr = elf_section_data (sec)->rel.hdr; + + rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count; + rela_hdr->contents = (unsigned char *) bfd_alloc (abfd, rela_hdr->sh_size); + if (rela_hdr->contents == NULL) + { + *failedp = TRUE; + return; + } + + /* Figure out whether the relocations are RELA or REL relocations. */ + if (rela_hdr->sh_type == SHT_RELA) + { + swap_out = elf_swap_reloca_out; + extsize = sizeof (Elf_External_Rela); + } + else if (rela_hdr->sh_type == SHT_REL) + { + swap_out = elf_swap_reloc_out; + extsize = sizeof (Elf_External_Rel); + } + else + /* Every relocation section should be either an SHT_RELA or an + SHT_REL section. */ + abort (); + + /* The address of an ELF reloc is section relative for an object + file, and absolute for an executable file or shared library. + The address of a BFD reloc is always section relative. */ + addr_offset = 0; + if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) + addr_offset = sec->vma; + + /* orelocation has the data, reloc_count has the count... */ + last_sym = 0; + last_sym_idx = 0; + dst_rela = rela_hdr->contents; + + for (idx = 0; idx < sec->reloc_count; idx++, dst_rela += extsize) + { + Elf_Internal_Rela src_rela; + arelent *ptr; + asymbol *sym; + int n; + + ptr = sec->orelocation[idx]; + sym = *ptr->sym_ptr_ptr; + if (sym == last_sym) + n = last_sym_idx; + else if (bfd_is_abs_section (sym->section) && sym->value == 0) + n = STN_UNDEF; + else + { + last_sym = sym; + n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); + if (n < 0) + { + *failedp = TRUE; + return; + } + last_sym_idx = n; + } + + if ((*ptr->sym_ptr_ptr)->the_bfd != NULL + && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec + && ! _bfd_elf_validate_reloc (abfd, ptr)) + { + *failedp = TRUE; + return; + } + + src_rela.r_offset = ptr->address + addr_offset; + src_rela.r_info = ELF_R_INFO (n, ptr->howto->type); + src_rela.r_addend = ptr->addend; + (*swap_out) (abfd, &src_rela, dst_rela); + } +} + +/* Write out the program headers. */ + +int +elf_write_out_phdrs (bfd *abfd, + const Elf_Internal_Phdr *phdr, + unsigned int count) +{ + while (count--) + { + Elf_External_Phdr extphdr; + elf_swap_phdr_out (abfd, phdr, &extphdr); + if (bfd_bwrite (&extphdr, sizeof (Elf_External_Phdr), abfd) + != sizeof (Elf_External_Phdr)) + return -1; + phdr++; + } + return 0; +} + +/* Write out the section headers and the ELF file header. */ + +bfd_boolean +elf_write_shdrs_and_ehdr (bfd *abfd) +{ + Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ + Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ + Elf_External_Shdr *x_shdrp; /* Section header table, external form */ + Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */ + unsigned int count; + bfd_size_type amt; + + i_ehdrp = elf_elfheader (abfd); + i_shdrp = elf_elfsections (abfd); + + /* swap the header before spitting it out... */ + +#if DEBUG & 1 + elf_debug_file (i_ehdrp); +#endif + elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr); + amt = sizeof (x_ehdr); + if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 + || bfd_bwrite (&x_ehdr, amt, abfd) != amt) + return FALSE; + + /* Some fields in the first section header handle overflow of ehdr + fields. */ + if (i_ehdrp->e_phnum >= PN_XNUM) + i_shdrp[0]->sh_info = i_ehdrp->e_phnum; + if (i_ehdrp->e_shnum >= (SHN_LORESERVE & 0xffff)) + i_shdrp[0]->sh_size = i_ehdrp->e_shnum; + if (i_ehdrp->e_shstrndx >= (SHN_LORESERVE & 0xffff)) + i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx; + + /* at this point we've concocted all the ELF sections... */ + amt = i_ehdrp->e_shnum; + amt *= sizeof (*x_shdrp); + x_shdrp = (Elf_External_Shdr *) bfd_alloc (abfd, amt); + if (!x_shdrp) + return FALSE; + + for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++) + { +#if DEBUG & 2 + elf_debug_section (count, *i_shdrp); +#endif + elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count); + } + if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0 + || bfd_bwrite (x_shdrp, amt, abfd) != amt) + return FALSE; + + /* need to dump the string table too... */ + + return TRUE; +} + +bfd_boolean +elf_checksum_contents (bfd *abfd, + void (*process) (const void *, size_t, void *), + void *arg) +{ + Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd); + Elf_Internal_Shdr **i_shdrp = elf_elfsections (abfd); + Elf_Internal_Phdr *i_phdrp = elf_tdata (abfd)->phdr; + unsigned int count, num; + + { + Elf_External_Ehdr x_ehdr; + Elf_Internal_Ehdr i_ehdr; + + i_ehdr = *i_ehdrp; + i_ehdr.e_phoff = i_ehdr.e_shoff = 0; + elf_swap_ehdr_out (abfd, &i_ehdr, &x_ehdr); + (*process) (&x_ehdr, sizeof x_ehdr, arg); + } + + num = i_ehdrp->e_phnum; + for (count = 0; count < num; count++) + { + Elf_External_Phdr x_phdr; + elf_swap_phdr_out (abfd, &i_phdrp[count], &x_phdr); + (*process) (&x_phdr, sizeof x_phdr, arg); + } + + num = elf_numsections (abfd); + for (count = 0; count < num; count++) + { + Elf_Internal_Shdr i_shdr; + Elf_External_Shdr x_shdr; + bfd_byte *contents, *free_contents; + + i_shdr = *i_shdrp[count]; + i_shdr.sh_offset = 0; + + elf_swap_shdr_out (abfd, &i_shdr, &x_shdr); + (*process) (&x_shdr, sizeof x_shdr, arg); + + /* Process the section's contents, if it has some. + PR ld/12451: Read them in if necessary. */ + if (i_shdr.sh_type == SHT_NOBITS) + continue; + free_contents = NULL; + contents = i_shdr.contents; + if (contents == NULL) + { + asection *sec; + + sec = bfd_section_from_elf_index (abfd, count); + if (sec != NULL) + { + contents = sec->contents; + if (contents == NULL) + { + /* Force rereading from file. */ + sec->flags &= ~SEC_IN_MEMORY; + if (!bfd_malloc_and_get_section (abfd, sec, &free_contents)) + continue; + contents = free_contents; + } + } + } + if (contents != NULL) + { + (*process) (contents, i_shdr.sh_size, arg); + if (free_contents != NULL) + free (free_contents); + } + } + + return TRUE; +} + +long +elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic) +{ + Elf_Internal_Shdr *hdr; + Elf_Internal_Shdr *verhdr; + unsigned long symcount; /* Number of external ELF symbols */ + elf_symbol_type *sym; /* Pointer to current bfd symbol */ + elf_symbol_type *symbase; /* Buffer for generated bfd symbols */ + Elf_Internal_Sym *isym; + Elf_Internal_Sym *isymend; + Elf_Internal_Sym *isymbuf = NULL; + Elf_External_Versym *xver; + Elf_External_Versym *xverbuf = NULL; + const struct elf_backend_data *ebd; + bfd_size_type amt; + + /* Read each raw ELF symbol, converting from external ELF form to + internal ELF form, and then using the information to create a + canonical bfd symbol table entry. + + Note that we allocate the initial bfd canonical symbol buffer + based on a one-to-one mapping of the ELF symbols to canonical + symbols. We actually use all the ELF symbols, so there will be no + space left over at the end. When we have all the symbols, we + build the caller's pointer vector. */ + + if (! dynamic) + { + hdr = &elf_tdata (abfd)->symtab_hdr; + verhdr = NULL; + } + else + { + hdr = &elf_tdata (abfd)->dynsymtab_hdr; + if (elf_dynversym (abfd) == 0) + verhdr = NULL; + else + verhdr = &elf_tdata (abfd)->dynversym_hdr; + if ((elf_dynverdef (abfd) != 0 + && elf_tdata (abfd)->verdef == NULL) + || (elf_dynverref (abfd) != 0 + && elf_tdata (abfd)->verref == NULL)) + { + if (!_bfd_elf_slurp_version_tables (abfd, FALSE)) + return -1; + } + } + + ebd = get_elf_backend_data (abfd); + symcount = hdr->sh_size / sizeof (Elf_External_Sym); + if (symcount == 0) + sym = symbase = NULL; + else + { + isymbuf = bfd_elf_get_elf_syms (abfd, hdr, symcount, 0, + NULL, NULL, NULL); + if (isymbuf == NULL) + return -1; + + amt = symcount; + amt *= sizeof (elf_symbol_type); + symbase = (elf_symbol_type *) bfd_zalloc (abfd, amt); + if (symbase == (elf_symbol_type *) NULL) + goto error_return; + + /* Read the raw ELF version symbol information. */ + if (verhdr != NULL + && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount) + { + (*_bfd_error_handler) + (_("%s: version count (%ld) does not match symbol count (%ld)"), + abfd->filename, + (long) (verhdr->sh_size / sizeof (Elf_External_Versym)), + symcount); + + /* Slurp in the symbols without the version information, + since that is more helpful than just quitting. */ + verhdr = NULL; + } + + if (verhdr != NULL) + { + if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0) + goto error_return; + + xverbuf = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size); + if (xverbuf == NULL && verhdr->sh_size != 0) + goto error_return; + + if (bfd_bread (xverbuf, verhdr->sh_size, abfd) != verhdr->sh_size) + goto error_return; + } + + /* Skip first symbol, which is a null dummy. */ + xver = xverbuf; + if (xver != NULL) + ++xver; + isymend = isymbuf + symcount; + for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++) + { + memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym)); + sym->symbol.the_bfd = abfd; + + sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL); + + sym->symbol.value = isym->st_value; + + if (isym->st_shndx == SHN_UNDEF) + { + sym->symbol.section = bfd_und_section_ptr; + } + else if (isym->st_shndx == SHN_ABS) + { + sym->symbol.section = bfd_abs_section_ptr; + } + else if (isym->st_shndx == SHN_COMMON) + { + sym->symbol.section = bfd_com_section_ptr; + if ((abfd->flags & BFD_PLUGIN) != 0) + { + asection *xc = bfd_get_section_by_name (abfd, "COMMON"); + + if (xc == NULL) + { + flagword flags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP + | SEC_EXCLUDE); + xc = bfd_make_section_with_flags (abfd, "COMMON", flags); + if (xc == NULL) + goto error_return; + } + sym->symbol.section = xc; + } + /* Elf puts the alignment into the `value' field, and + the size into the `size' field. BFD wants to see the + size in the value field, and doesn't care (at the + moment) about the alignment. */ + sym->symbol.value = isym->st_size; + } + else + { + sym->symbol.section + = bfd_section_from_elf_index (abfd, isym->st_shndx); + if (sym->symbol.section == NULL) + { + /* This symbol is in a section for which we did not + create a BFD section. Just use bfd_abs_section, + although it is wrong. FIXME. */ + sym->symbol.section = bfd_abs_section_ptr; + } + } + + /* If this is a relocatable file, then the symbol value is + already section relative. */ + if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) + sym->symbol.value -= sym->symbol.section->vma; + + switch (ELF_ST_BIND (isym->st_info)) + { + case STB_LOCAL: + sym->symbol.flags |= BSF_LOCAL; + break; + case STB_GLOBAL: + if (isym->st_shndx != SHN_UNDEF && isym->st_shndx != SHN_COMMON) + sym->symbol.flags |= BSF_GLOBAL; + break; + case STB_WEAK: + sym->symbol.flags |= BSF_WEAK; + break; + case STB_GNU_UNIQUE: + sym->symbol.flags |= BSF_GNU_UNIQUE; + break; + } + + switch (ELF_ST_TYPE (isym->st_info)) + { + case STT_SECTION: + sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING; + break; + case STT_FILE: + sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING; + break; + case STT_FUNC: + sym->symbol.flags |= BSF_FUNCTION; + break; + case STT_COMMON: + /* FIXME: Do we have to put the size field into the value field + as we do with symbols in SHN_COMMON sections (see above) ? */ + /* Fall through. */ + case STT_OBJECT: + sym->symbol.flags |= BSF_OBJECT; + break; + case STT_TLS: + sym->symbol.flags |= BSF_THREAD_LOCAL; + break; + case STT_RELC: + sym->symbol.flags |= BSF_RELC; + break; + case STT_SRELC: + sym->symbol.flags |= BSF_SRELC; + break; + case STT_GNU_IFUNC: + sym->symbol.flags |= BSF_GNU_INDIRECT_FUNCTION; + break; + } + + if (dynamic) + sym->symbol.flags |= BSF_DYNAMIC; + + if (xver != NULL) + { + Elf_Internal_Versym iversym; + + _bfd_elf_swap_versym_in (abfd, xver, &iversym); + sym->version = iversym.vs_vers; + xver++; + } + + /* Do some backend-specific processing on this symbol. */ + if (ebd->elf_backend_symbol_processing) + (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol); + } + } + + /* Do some backend-specific processing on this symbol table. */ + if (ebd->elf_backend_symbol_table_processing) + (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount); + + /* We rely on the zalloc to clear out the final symbol entry. */ + + symcount = sym - symbase; + + /* Fill in the user's symbol pointer vector if needed. */ + if (symptrs) + { + long l = symcount; + + sym = symbase; + while (l-- > 0) + { + *symptrs++ = &sym->symbol; + sym++; + } + *symptrs = 0; /* Final null pointer */ + } + + if (xverbuf != NULL) + free (xverbuf); + if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) + free (isymbuf); + return symcount; + +error_return: + if (xverbuf != NULL) + free (xverbuf); + if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) + free (isymbuf); + return -1; +} + +/* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of + them. */ + +static bfd_boolean +elf_slurp_reloc_table_from_section (bfd *abfd, + asection *asect, + Elf_Internal_Shdr *rel_hdr, + bfd_size_type reloc_count, + arelent *relents, + asymbol **symbols, + bfd_boolean dynamic) +{ + const struct elf_backend_data * const ebd = get_elf_backend_data (abfd); + void *allocated = NULL; + bfd_byte *native_relocs; + arelent *relent; + unsigned int i; + int entsize; + unsigned int symcount; + + allocated = bfd_malloc (rel_hdr->sh_size); + if (allocated == NULL) + goto error_return; + + if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0 + || (bfd_bread (allocated, rel_hdr->sh_size, abfd) + != rel_hdr->sh_size)) + goto error_return; + + native_relocs = (bfd_byte *) allocated; + + entsize = rel_hdr->sh_entsize; + BFD_ASSERT (entsize == sizeof (Elf_External_Rel) + || entsize == sizeof (Elf_External_Rela)); + + if (dynamic) + symcount = bfd_get_dynamic_symcount (abfd); + else + symcount = bfd_get_symcount (abfd); + + for (i = 0, relent = relents; + i < reloc_count; + i++, relent++, native_relocs += entsize) + { + Elf_Internal_Rela rela; + + if (entsize == sizeof (Elf_External_Rela)) + elf_swap_reloca_in (abfd, native_relocs, &rela); + else + elf_swap_reloc_in (abfd, native_relocs, &rela); + + /* The address of an ELF reloc is section relative for an object + file, and absolute for an executable file or shared library. + The address of a normal BFD reloc is always section relative, + and the address of a dynamic reloc is absolute.. */ + if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic) + relent->address = rela.r_offset; + else + relent->address = rela.r_offset - asect->vma; + + if (ELF_R_SYM (rela.r_info) == STN_UNDEF) + relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; + else if (ELF_R_SYM (rela.r_info) > symcount) + { + (*_bfd_error_handler) + (_("%s(%s): relocation %d has invalid symbol index %ld"), + abfd->filename, asect->name, i, ELF_R_SYM (rela.r_info)); + relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; + } + else + { + asymbol **ps; + + ps = symbols + ELF_R_SYM (rela.r_info) - 1; + + relent->sym_ptr_ptr = ps; + } + + relent->addend = rela.r_addend; + + if ((entsize == sizeof (Elf_External_Rela) + && ebd->elf_info_to_howto != NULL) + || ebd->elf_info_to_howto_rel == NULL) + (*ebd->elf_info_to_howto) (abfd, relent, &rela); + else + (*ebd->elf_info_to_howto_rel) (abfd, relent, &rela); + } + + if (allocated != NULL) + free (allocated); + + return TRUE; + + error_return: + if (allocated != NULL) + free (allocated); + return FALSE; +} + +/* Read in and swap the external relocs. */ + +bfd_boolean +elf_slurp_reloc_table (bfd *abfd, + asection *asect, + asymbol **symbols, + bfd_boolean dynamic) +{ + struct bfd_elf_section_data * const d = elf_section_data (asect); + Elf_Internal_Shdr *rel_hdr; + Elf_Internal_Shdr *rel_hdr2; + bfd_size_type reloc_count; + bfd_size_type reloc_count2; + arelent *relents; + bfd_size_type amt; + + if (asect->relocation != NULL) + return TRUE; + + if (! dynamic) + { + if ((asect->flags & SEC_RELOC) == 0 + || asect->reloc_count == 0) + return TRUE; + + rel_hdr = d->rel.hdr; + reloc_count = rel_hdr ? NUM_SHDR_ENTRIES (rel_hdr) : 0; + rel_hdr2 = d->rela.hdr; + reloc_count2 = rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0; + + BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2); + BFD_ASSERT ((rel_hdr && asect->rel_filepos == rel_hdr->sh_offset) + || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset)); + + } + else + { + /* Note that ASECT->RELOC_COUNT tends not to be accurate in this + case because relocations against this section may use the + dynamic symbol table, and in that case bfd_section_from_shdr + in elf.c does not update the RELOC_COUNT. */ + if (asect->size == 0) + return TRUE; + + rel_hdr = &d->this_hdr; + reloc_count = NUM_SHDR_ENTRIES (rel_hdr); + rel_hdr2 = NULL; + reloc_count2 = 0; + } + + amt = (reloc_count + reloc_count2) * sizeof (arelent); + relents = (arelent *) bfd_alloc (abfd, amt); + if (relents == NULL) + return FALSE; + + if (rel_hdr + && !elf_slurp_reloc_table_from_section (abfd, asect, + rel_hdr, reloc_count, + relents, + symbols, dynamic)) + return FALSE; + + if (rel_hdr2 + && !elf_slurp_reloc_table_from_section (abfd, asect, + rel_hdr2, reloc_count2, + relents + reloc_count, + symbols, dynamic)) + return FALSE; + + asect->relocation = relents; + return TRUE; +} + +#if DEBUG & 2 +static void +elf_debug_section (int num, Elf_Internal_Shdr *hdr) +{ + fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, + hdr->bfd_section != NULL ? hdr->bfd_section->name : "", + (long) hdr); + fprintf (stderr, + "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n", + (long) hdr->sh_name, + (long) hdr->sh_type, + (long) hdr->sh_flags); + fprintf (stderr, + "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n", + (long) hdr->sh_addr, + (long) hdr->sh_offset, + (long) hdr->sh_size); + fprintf (stderr, + "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n", + (long) hdr->sh_link, + (long) hdr->sh_info, + (long) hdr->sh_addralign); + fprintf (stderr, "sh_entsize = %ld\n", + (long) hdr->sh_entsize); + fflush (stderr); +} +#endif + +#if DEBUG & 1 +static void +elf_debug_file (Elf_Internal_Ehdr *ehdrp) +{ + fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry); + fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff); + fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum); + fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize); + fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff); + fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum); + fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize); +} +#endif + +/* Create a new BFD as if by bfd_openr. Rather than opening a file, + reconstruct an ELF file by reading the segments out of remote memory + based on the ELF file header at EHDR_VMA and the ELF program headers it + points to. If not null, *LOADBASEP is filled in with the difference + between the VMAs from which the segments were read, and the VMAs the + file headers (and hence BFD's idea of each section's VMA) put them at. + + The function TARGET_READ_MEMORY is called to copy LEN bytes from the + remote memory at target address VMA into the local buffer at MYADDR; it + should return zero on success or an `errno' code on failure. TEMPL must + be a BFD for a target with the word size and byte order found in the + remote memory. */ + +bfd * +NAME(_bfd_elf,bfd_from_remote_memory) + (bfd *templ, + bfd_vma ehdr_vma, + bfd_vma *loadbasep, + int (*target_read_memory) (bfd_vma, bfd_byte *, bfd_size_type)) +{ + Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ + Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */ + Elf_External_Phdr *x_phdrs; + Elf_Internal_Phdr *i_phdrs, *last_phdr; + bfd *nbfd; + struct bfd_in_memory *bim; + int contents_size; + bfd_byte *contents; + int err; + unsigned int i; + bfd_vma loadbase; + bfd_boolean loadbase_set; + + /* Read in the ELF header in external format. */ + err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr); + if (err) + { + bfd_set_error (bfd_error_system_call); + errno = err; + return NULL; + } + + /* Now check to see if we have a valid ELF file, and one that BFD can + make use of. The magic number must match, the address size ('class') + and byte-swapping must match our XVEC entry. */ + + if (! elf_file_p (&x_ehdr) + || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT + || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) + { + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + + /* Check that file's byte order matches xvec's */ + switch (x_ehdr.e_ident[EI_DATA]) + { + case ELFDATA2MSB: /* Big-endian */ + if (! bfd_header_big_endian (templ)) + { + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + break; + case ELFDATA2LSB: /* Little-endian */ + if (! bfd_header_little_endian (templ)) + { + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + break; + case ELFDATANONE: /* No data encoding specified */ + default: /* Unknown data encoding specified */ + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + + elf_swap_ehdr_in (templ, &x_ehdr, &i_ehdr); + + /* The file header tells where to find the program headers. + These are what we use to actually choose what to read. */ + + if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0) + { + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + + x_phdrs = (Elf_External_Phdr *) + bfd_malloc (i_ehdr.e_phnum * (sizeof *x_phdrs + sizeof *i_phdrs)); + if (x_phdrs == NULL) + { + bfd_set_error (bfd_error_no_memory); + return NULL; + } + err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs, + i_ehdr.e_phnum * sizeof x_phdrs[0]); + if (err) + { + free (x_phdrs); + bfd_set_error (bfd_error_system_call); + errno = err; + return NULL; + } + i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum]; + + contents_size = 0; + last_phdr = NULL; + loadbase = ehdr_vma; + loadbase_set = FALSE; + for (i = 0; i < i_ehdr.e_phnum; ++i) + { + elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]); + if (i_phdrs[i].p_type == PT_LOAD) + { + bfd_vma segment_end; + segment_end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz + + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align; + if (segment_end > (bfd_vma) contents_size) + contents_size = segment_end; + + /* LOADADDR is the `Base address' from the gELF specification: + `lowest p_vaddr value for a PT_LOAD segment' is P_VADDR from the + first PT_LOAD as PT_LOADs are ordered by P_VADDR. */ + if (!loadbase_set && (i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0) + { + loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align); + loadbase_set = TRUE; + } + + last_phdr = &i_phdrs[i]; + } + } + if (last_phdr == NULL) + { + /* There were no PT_LOAD segments, so we don't have anything to read. */ + free (x_phdrs); + bfd_set_error (bfd_error_wrong_format); + return NULL; + } + + /* Trim the last segment so we don't bother with zeros in the last page + that are off the end of the file. However, if the extra bit in that + page includes the section headers, keep them. */ + if ((bfd_vma) contents_size > last_phdr->p_offset + last_phdr->p_filesz + && (bfd_vma) contents_size >= (i_ehdr.e_shoff + + i_ehdr.e_shnum * i_ehdr.e_shentsize)) + { + contents_size = last_phdr->p_offset + last_phdr->p_filesz; + if ((bfd_vma) contents_size < (i_ehdr.e_shoff + + i_ehdr.e_shnum * i_ehdr.e_shentsize)) + contents_size = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize; + } + else + contents_size = last_phdr->p_offset + last_phdr->p_filesz; + + /* Now we know the size of the whole image we want read in. */ + contents = (bfd_byte *) bfd_zmalloc (contents_size); + if (contents == NULL) + { + free (x_phdrs); + bfd_set_error (bfd_error_no_memory); + return NULL; + } + + for (i = 0; i < i_ehdr.e_phnum; ++i) + if (i_phdrs[i].p_type == PT_LOAD) + { + bfd_vma start = i_phdrs[i].p_offset & -i_phdrs[i].p_align; + bfd_vma end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz + + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align; + if (end > (bfd_vma) contents_size) + end = contents_size; + err = target_read_memory ((loadbase + i_phdrs[i].p_vaddr) + & -i_phdrs[i].p_align, + contents + start, end - start); + if (err) + { + free (x_phdrs); + free (contents); + bfd_set_error (bfd_error_system_call); + errno = err; + return NULL; + } + } + free (x_phdrs); + + /* If the segments visible in memory didn't include the section headers, + then clear them from the file header. */ + if ((bfd_vma) contents_size < (i_ehdr.e_shoff + + i_ehdr.e_shnum * i_ehdr.e_shentsize)) + { + memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff); + memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum); + memset (&x_ehdr.e_shstrndx, 0, sizeof x_ehdr.e_shstrndx); + } + + /* This will normally have been in the first PT_LOAD segment. But it + conceivably could be missing, and we might have just changed it. */ + memcpy (contents, &x_ehdr, sizeof x_ehdr); + + /* Now we have a memory image of the ELF file contents. Make a BFD. */ + bim = (struct bfd_in_memory *) bfd_malloc (sizeof (struct bfd_in_memory)); + if (bim == NULL) + { + free (contents); + bfd_set_error (bfd_error_no_memory); + return NULL; + } + nbfd = _bfd_new_bfd (); + if (nbfd == NULL) + { + free (bim); + free (contents); + bfd_set_error (bfd_error_no_memory); + return NULL; + } + nbfd->filename = "<in-memory>"; + nbfd->xvec = templ->xvec; + bim->size = contents_size; + bim->buffer = contents; + nbfd->iostream = bim; + nbfd->flags = BFD_IN_MEMORY; + nbfd->iovec = &_bfd_memory_iovec; + nbfd->origin = 0; + nbfd->direction = read_direction; + nbfd->mtime = time (NULL); + nbfd->mtime_set = TRUE; + + if (loadbasep) + *loadbasep = loadbase; + return nbfd; +} + +/* Function for ELF_R_INFO. */ + +bfd_vma +NAME(elf,r_info) (bfd_vma sym, bfd_vma type) +{ + return ELF_R_INFO (sym, type); +} + +/* Function for ELF_R_SYM. */ + +bfd_vma +NAME(elf,r_sym) (bfd_vma r_info) +{ + return ELF_R_SYM (r_info); +} + +#include "elfcore.h" + +/* Size-dependent data and functions. */ +const struct elf_size_info NAME(_bfd_elf,size_info) = { + sizeof (Elf_External_Ehdr), + sizeof (Elf_External_Phdr), + sizeof (Elf_External_Shdr), + sizeof (Elf_External_Rel), + sizeof (Elf_External_Rela), + sizeof (Elf_External_Sym), + sizeof (Elf_External_Dyn), + sizeof (Elf_External_Note), + 4, + 1, + ARCH_SIZE, LOG_FILE_ALIGN, + ELFCLASS, EV_CURRENT, + elf_write_out_phdrs, + elf_write_shdrs_and_ehdr, + elf_checksum_contents, + elf_write_relocs, + elf_swap_symbol_in, + elf_swap_symbol_out, + elf_slurp_reloc_table, + elf_slurp_symbol_table, + elf_swap_dyn_in, + elf_swap_dyn_out, + elf_swap_reloc_in, + elf_swap_reloc_out, + elf_swap_reloca_in, + elf_swap_reloca_out +}; |