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- /* BFD back-end data structures for a.out (and similar) files.
- Copyright (C) 1990-1991 Free Software Foundation, Inc.
- Written by Cygnus Support.
-
- 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* We try to encapsulate the differences in the various a.out file
- variants in a few routines, and otherwise share large masses of code.
- This means we only have to fix bugs in one place, most of the time. */
-
- /* $Id: libaout.h,v 1.24 1992/01/24 22:43:22 sac Exp $ */
-
- #ifdef __STDC__
- #define CAT3(a,b,c) a##b##c
- #else
- #define CAT3(a,b,c) a/**/b/**/c
- #endif
-
- /* Parameterize the a.out code based on whether it is being built
- for a 32-bit architecture or a 64-bit architecture. */
- #if ARCH_SIZE==64
- #define GET_WORD bfd_h_get_64
- #define GET_SWORD (int64_type)GET_WORD
- #define PUT_WORD bfd_h_put_64
- #define NAME(x,y) CAT3(x,_64_,y)
- #define JNAME(x) CAT(x,_64)
- #define BYTES_IN_WORD 8
- #else
- #define GET_WORD bfd_h_get_32
- #define GET_SWORD (int32_type)GET_WORD
- #define PUT_WORD bfd_h_put_32
- #define NAME(x,y) CAT3(x,_32_,y)
- #define JNAME(x) CAT(x,_32)
- #define BYTES_IN_WORD 4
- #endif
-
- /* Declare these types at file level, since they are used in parameter
- lists, which have wierd scope. */
- struct external_exec;
- struct internal_exec;
-
- /* This is the layout in memory of a "struct exec" while we process it.
- All 'lengths' are given as a number of bytes.
- All 'alignments' are for relinkable files only; an alignment of
- 'n' indicates the corresponding segment must begin at an
- address that is a multiple of (2**n). */
-
- struct internal_exec
- {
- long a_info; /* Magic number and flags, packed */
- bfd_vma a_text; /* length of text, in bytes */
- bfd_vma a_data; /* length of data, in bytes */
- bfd_vma a_bss; /* length of uninitialized data area in mem */
- bfd_vma a_syms; /* length of symbol table data in file */
- bfd_vma a_entry; /* start address */
- bfd_vma a_trsize; /* length of text's relocation info, in bytes */
- bfd_vma a_drsize; /* length of data's relocation info, in bytes */
- /* Added for i960 */
- bfd_vma a_tload; /* Text runtime load address */
- bfd_vma a_dload; /* Data runtime load address */
- unsigned char a_talign; /* Alignment of text segment */
- unsigned char a_dalign; /* Alignment of data segment */
- unsigned char a_balign; /* Alignment of bss segment */
- };
-
- /* Magic number is written
- < MSB >
- 3130292827262524232221201918171615141312111009080706050403020100
- < FLAGS >< MACHINE TYPE >< MAGIC NUMBER >
- */
- enum machine_type {
- M_UNKNOWN = 0,
- M_68010 = 1,
- M_68020 = 2,
- M_SPARC = 3,
- /* skip a bunch so we dont run into any of suns numbers */
- M_386 = 100,
- M_29K = 101,
- M_HP200 = 200, /* HP 200 (68010) BSD binary */
- M_HP300 = (300 % 256), /* HP 300 (68020+68881) BSD binary */
- M_HPUX = (0x20c % 256)/* HP 200/300 HPUX binary */
- };
-
- #define N_DYNAMIC(exec) ((exec).a_info & 0x8000000)
-
- #define N_MAGIC(exec) ((exec).a_info & 0xffff)
- #define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
- #define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
- #define N_SET_INFO(exec, magic, type, flags) \
- ((exec).a_info = ((magic) & 0xffff) \
- | (((int)(type) & 0xff) << 16) \
- | (((flags) & 0xff) << 24))
-
- #define N_SET_MAGIC(exec, magic) \
- ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
-
- #define N_SET_MACHTYPE(exec, machtype) \
- ((exec).a_info = \
- ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))
-
- #define N_SET_FLAGS(exec, flags) \
- ((exec).a_info = \
- ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
-
- typedef struct aout_symbol {
- asymbol symbol;
- short desc;
- char other;
- unsigned char type;
- } aout_symbol_type;
-
- /* The `tdata' struct for all a.out-like object file formats.
- Various things depend on this struct being around any time an a.out
- file is being handled. An example is dbxread.c in GDB. */
-
- struct aoutdata {
- struct internal_exec *hdr; /* exec file header */
- aout_symbol_type *symbols; /* symtab for input bfd */
-
- /* For ease, we do this */
- asection *textsec;
- asection *datasec;
- asection *bsssec;
-
- /* We remember these offsets so that after check_file_format, we have
- no dependencies on the particular format of the exec_hdr. */
- file_ptr sym_filepos;
- file_ptr str_filepos;
-
- /* Size of a relocation entry in external form */
- unsigned reloc_entry_size;
-
- /* Size of a symbol table entry in external form */
- unsigned symbol_entry_size;
-
- /* Page size - needed for alignment of demand paged files. */
- unsigned long page_size;
-
- /* Segment size - needed for alignment of demand paged files. */
- unsigned long segment_size;
-
- unsigned exec_bytes_size;
- };
-
- struct aout_data_struct {
- struct aoutdata a;
- struct internal_exec e;
- };
-
- #define adata(bfd) ((bfd)->tdata.aout_data->a)
- #define exec_hdr(bfd) (adata(bfd).hdr)
- #define obj_aout_symbols(bfd) (adata(bfd).symbols)
- #define obj_textsec(bfd) (adata(bfd).textsec)
- #define obj_datasec(bfd) (adata(bfd).datasec)
- #define obj_bsssec(bfd) (adata(bfd).bsssec)
- #define obj_sym_filepos(bfd) (adata(bfd).sym_filepos)
- #define obj_str_filepos(bfd) (adata(bfd).str_filepos)
- #define obj_reloc_entry_size(bfd) (adata(bfd).reloc_entry_size)
- #define obj_symbol_entry_size(bfd) (adata(bfd).symbol_entry_size)
-
- /* We take the address of the first element of an asymbol to ensure that the
- macro is only ever applied to an asymbol */
- #define aout_symbol(asymbol) ((aout_symbol_type *)(&(asymbol)->the_bfd))
-
- /* Prototype declarations for functions defined in aoutx.h */
-
- PROTO (boolean, NAME(aout,squirt_out_relocs),(bfd *abfd, asection *section));
-
- PROTO (bfd_target *, NAME(aout,some_aout_object_p), (bfd *abfd,
- struct internal_exec *execp,
- bfd_target *(*callback)()));
- PROTO (boolean, NAME(aout,mkobject), (bfd *abfd));
- PROTO (enum machine_type, NAME(aout,machine_type), (enum bfd_architecture arch,
- unsigned long machine));
- PROTO (boolean, NAME(aout,set_arch_mach), (bfd *abfd, enum bfd_architecture arch,
- unsigned long machine));
-
- PROTO (boolean, NAME(aout,new_section_hook), (bfd *abfd, asection *newsect));
- PROTO (boolean, NAME(aout,set_section_contents), (bfd *abfd, sec_ptr section,
- PTR location, file_ptr offset, bfd_size_type count));
-
- PROTO (asymbol *,NAME(aout,make_empty_symbol), (bfd *abfd));
- PROTO (boolean, NAME(aout,slurp_symbol_table), (bfd *abfd));
- PROTO (void, NAME(aout,write_syms), (bfd *abfd));
- PROTO (void, NAME(aout,reclaim_symbol_table), (bfd *abfd));
- PROTO (unsigned int, NAME(aout,get_symtab_upper_bound), (bfd *abfd));
- PROTO (unsigned int, NAME(aout,get_symtab), (bfd *abfd, asymbol **location));
- PROTO (boolean, NAME(aout,slurp_reloc_table), (bfd *abfd, sec_ptr asect,
- asymbol **symbols));
- PROTO (unsigned int, NAME(aout,canonicalize_reloc), (bfd *abfd, sec_ptr section,
- arelent **relptr, asymbol **symbols));
- PROTO (unsigned int, NAME(aout,get_reloc_upper_bound), (bfd *abfd, sec_ptr asect));
- PROTO (void, NAME(aout,reclaim_reloc), (bfd *ignore_abfd, sec_ptr ignore));
- PROTO (alent *, NAME(aout,get_lineno), (bfd *ignore_abfd, asymbol *ignore_symbol));
- PROTO (void, NAME(aout,print_symbol), (bfd *ignore_abfd, PTR file,
- asymbol *symbol, bfd_print_symbol_type how));
- PROTO (boolean, NAME(aout,close_and_cleanup), (bfd *abfd));
- PROTO (boolean, NAME(aout,find_nearest_line), (bfd *abfd, asection *section,
- asymbol **symbols, bfd_vma offset, CONST char **filename_ptr,
- CONST char **functionname_ptr, unsigned int *line_ptr));
- PROTO (int, NAME(aout,sizeof_headers), (bfd *abfd, boolean exec));
-
-
- PROTO (void, NAME(aout,swap_exec_header_in), (bfd *abfd,
- struct external_exec *raw_bytes, struct internal_exec *execp));
-
- PROTO (void, NAME(aout,swap_exec_header_out),(bfd *abfd, struct internal_exec *execp,
- struct external_exec *raw_bytes));
-
- /* Prototypes for functions in stab-syms.c. */
-
- PROTO(char *, aout_stab_name, (int code));
-
- /* A.out uses the generic versions of these routines... */
-
- #define aout_32_get_section_contents bfd_generic_get_section_contents
- #define aout_32_close_and_cleanup bfd_generic_close_and_cleanup
-
- #define aout_64_get_section_contents bfd_generic_get_section_contents
- #define aout_64_close_and_cleanup bfd_generic_close_and_cleanup
-
- #define WRITE_HEADERS(abfd, execp) \
- { \
- if (abfd->flags & D_PAGED) \
- { \
- execp->a_text = obj_textsec (abfd)->_raw_size; \
- /* Kludge to distinguish old- and new-style ZMAGIC. \
- The latter includes the exec header in the text size. */ \
- if (obj_textsec(abfd)->filepos == EXEC_BYTES_SIZE) \
- execp->a_text += EXEC_BYTES_SIZE; \
- N_SET_MAGIC (*execp, ZMAGIC); \
- } \
- else \
- { \
- execp->a_text = obj_textsec (abfd)->_raw_size; \
- if (abfd->flags & WP_TEXT) \
- { N_SET_MAGIC (*execp, NMAGIC); } \
- else \
- { N_SET_MAGIC(*execp, OMAGIC); } \
- } \
- if (abfd->flags & D_PAGED) \
- { \
- data_pad = BFD_ALIGN(obj_datasec(abfd)->_raw_size, PAGE_SIZE) \
- - obj_datasec(abfd)->_raw_size; \
- \
- if (data_pad > obj_bsssec(abfd)->_raw_size) \
- execp->a_bss = 0; \
- else \
- execp->a_bss = obj_bsssec(abfd)->_raw_size - data_pad; \
- execp->a_data = obj_datasec(abfd)->_raw_size + data_pad; \
- } \
- else \
- { \
- execp->a_data = obj_datasec (abfd)->_raw_size; \
- execp->a_bss = obj_bsssec (abfd)->_raw_size; \
- } \
- \
- execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE; \
- execp->a_entry = bfd_get_start_address (abfd); \
- \
- execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * \
- obj_reloc_entry_size (abfd)); \
- execp->a_drsize = ((obj_datasec (abfd)->reloc_count) * \
- obj_reloc_entry_size (abfd)); \
- NAME(aout,swap_exec_header_out) (abfd, execp, &exec_bytes); \
- \
- bfd_seek (abfd, 0L, false); \
- bfd_write ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd); \
- /* Now write out reloc info, followed by syms and strings */ \
- \
- if (bfd_get_symcount (abfd) != 0) \
- { \
- bfd_seek (abfd, \
- (long)(N_SYMOFF(*execp)), false); \
- \
- NAME(aout,write_syms)(abfd); \
- \
- bfd_seek (abfd, (long)(N_TRELOFF(*execp)), false); \
- \
- if (!NAME(aout,squirt_out_relocs) (abfd, obj_textsec (abfd))) return false; \
- bfd_seek (abfd, (long)(N_DRELOFF(*execp)), false); \
- \
- if (!NAME(aout,squirt_out_relocs)(abfd, obj_datasec (abfd))) return false; \
- } \
- }
-