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binutils-gdb/bfd/libaout.h

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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. */
/* $Id$ */
#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;
};
#define adata(bfd) ((struct aoutdata *) ((bfd)->tdata))
#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 *ignore_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));
/* 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
/* Calculate the file positions of the parts of a newly read aout header */
#define WORK_OUT_FILE_POSITIONS(abfd, execp) \
/* The virtual memory addresses of the sections */ \
obj_datasec (abfd)->vma = N_DATADDR(*execp); \
obj_bsssec (abfd)->vma = N_BSSADDR(*execp); \
obj_textsec (abfd)->vma = N_TXTADDR(*execp); \
\
/* The file offsets of the sections */ \
obj_textsec (abfd)->filepos = N_TXTOFF (*execp); \
obj_datasec (abfd)->filepos = N_DATOFF (*execp); \
\
/* The file offsets of the relocation info */ \
obj_textsec (abfd)->rel_filepos = N_TRELOFF(*execp); \
obj_datasec (abfd)->rel_filepos = N_DRELOFF(*execp); \
\
/* The file offsets of the string table and symbol table. */ \
obj_sym_filepos (abfd) = N_SYMOFF (*execp); \
obj_str_filepos (abfd) = N_STROFF (*execp); \
#define WRITE_HEADERS(abfd, execp) \
{ \
if (abfd->flags & D_PAGED) \
{ \
execp->a_text = obj_textsec (abfd)->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)->size; \
if (abfd->flags & WP_TEXT) \
{ N_SET_MAGIC (*execp, NMAGIC); } \
else \
{ N_SET_MAGIC(*execp, OMAGIC); } \
} \
if (abfd->flags & D_PAGED) \
{ \
data_pad = ALIGN(obj_datasec(abfd)->size, PAGE_SIZE) \
- obj_datasec(abfd)->size; \
\
if (data_pad > obj_bsssec(abfd)->size) \
execp->a_bss = 0; \
else \
execp->a_bss = obj_bsssec(abfd)->size - data_pad; \
execp->a_data = obj_datasec(abfd)->size + data_pad; \
} \
else \
{ \
execp->a_data = obj_datasec (abfd)->size; \
execp->a_bss = obj_bsssec (abfd)->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; \
} \
}
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