211 lines
7.2 KiB
C
211 lines
7.2 KiB
C
/* a.out object file format
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Copyright (C) 1989, 1990, 1991 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2,
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or (at your option) any later version.
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GAS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with GAS; see the file COPYING. If not, write
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to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* $Id$ */
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/* Tag to validate a.out object file format processing */
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#define OBJ_AOUT 1
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#include "targ-cpu.h"
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#ifndef VMS
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#include "a.out.gnu.h" /* Needed to define struct nlist. Sigh. */
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#else
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#include "a_out.h"
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#endif
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struct reloc_info_generic
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{
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unsigned long r_address;
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/*
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* Using bit fields here is a bad idea because the order is not portable. :-(
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*/
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unsigned int r_index;
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#define r_symbolnum r_index
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unsigned r_extern : 1;
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unsigned r_pcrel:1;
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unsigned r_length:2; /* 0=>byte 1=>short 2=>long 3=>8byte */
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unsigned r_bsr:1; /* NS32K */
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unsigned r_disp:1; /* NS32k */
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unsigned r_callj:1; /* i960 */
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enum reloc_type r_type;
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long r_addend;
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};
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extern const short seg_N_TYPE[];
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extern const segT N_TYPE_seg[];
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#ifndef DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE
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#define DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE (OMAGIC)
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#endif /* DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE */
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/* SYMBOL TABLE */
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/* Symbol table entry data type */
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typedef struct nlist obj_symbol_type; /* Symbol table entry */
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/* If compiler generate leading underscores, remove them. */
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#ifndef STRIP_UNDERSCORE
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#define STRIP_UNDERSCORE 0
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#endif /* STRIP_UNDERSCORE */
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/* Symbol table macros and constants */
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/*
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* Macros to extract information from a symbol table entry.
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* This syntaxic indirection allows independence regarding a.out or coff.
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* The argument (s) of all these macros is a pointer to a symbol table entry.
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*/
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/* True if the symbol is external */
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#define S_IS_EXTERNAL(s) ((s)->sy_symbol.n_type & N_EXT)
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/* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT */
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#define S_IS_DEFINED(s) ((S_GET_TYPE(s) != N_UNDF) || (S_GET_OTHER(s) != 0) || (S_GET_DESC(s) != 0))
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#define S_IS_REGISTER(s) ((s)->sy_symbol.n_type == N_REGISTER)
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/* True if a debug special symbol entry */
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#define S_IS_DEBUG(s) ((s)->sy_symbol.n_type & N_STAB)
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/* True if a symbol is local symbol name */
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/* A symbol name whose name begin with ^A is a gas internal pseudo symbol
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nameless symbols come from .stab directives. */
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#define S_IS_LOCAL(s) (S_GET_NAME(s) && \
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!S_IS_DEBUG(s) && \
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(S_GET_NAME(s)[0] == '\001' || \
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(S_LOCAL_NAME(s) && !flagseen['L'])))
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/* True if a symbol is not defined in this file */
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#define S_IS_EXTERN(s) ((s)->sy_symbol.n_type & N_EXT)
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/* True if the symbol has been generated because of a .stabd directive */
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#define S_IS_STABD(s) (S_GET_NAME(s) == (char *)0)
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/* Accessors */
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/* The value of the symbol */
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#define S_GET_VALUE(s) (((s)->sy_symbol.n_value))
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/* The name of the symbol */
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#define S_GET_NAME(s) ((s)->sy_symbol.n_un.n_name)
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/* The pointer to the string table */
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#define S_GET_OFFSET(s) ((s)->sy_symbol.n_un.n_strx)
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/* The type of the symbol */
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#define S_GET_TYPE(s) ((s)->sy_symbol.n_type & N_TYPE)
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/* The numeric value of the segment */
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#define S_GET_SEGMENT(s) (N_TYPE_seg[S_GET_TYPE(s)])
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/* The n_other expression value */
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#define S_GET_OTHER(s) ((s)->sy_symbol.n_other)
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/* The n_desc expression value */
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#define S_GET_DESC(s) ((s)->sy_symbol.n_desc)
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/* Modifiers */
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/* Set the value of the symbol */
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#define S_SET_VALUE(s,v) ((s)->sy_symbol.n_value = (unsigned long) (v))
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/* Assume that a symbol cannot be simultaneously in more than on segment */
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/* set segment */
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#define S_SET_SEGMENT(s,seg) ((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type|=SEGMENT_TO_SYMBOL_TYPE(seg))
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/* The symbol is external */
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#define S_SET_EXTERNAL(s) ((s)->sy_symbol.n_type |= N_EXT)
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/* The symbol is not external */
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#define S_CLEAR_EXTERNAL(s) ((s)->sy_symbol.n_type &= ~N_EXT)
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/* Set the name of the symbol */
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#define S_SET_NAME(s,v) ((s)->sy_symbol.n_un.n_name = (v))
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/* Set the offset in the string table */
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#define S_SET_OFFSET(s,v) ((s)->sy_symbol.n_un.n_strx = (v))
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/* Set the n_other expression value */
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#define S_SET_OTHER(s,v) ((s)->sy_symbol.n_other = (v))
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/* Set the n_desc expression value */
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#define S_SET_DESC(s,v) ((s)->sy_symbol.n_desc = (v))
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/* File header macro and type definition */
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#define H_GET_FILE_SIZE(h) (H_GET_HEADER_SIZE(h) \
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+ H_GET_TEXT_SIZE(h) \
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+ H_GET_DATA_SIZE(h) \
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+ H_GET_SYMBOL_TABLE_SIZE(h) \
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+ H_GET_TEXT_RELOCATION_SIZE(h) \
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+ H_GET_DATA_RELOCATION_SIZE(h) \
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+ H_GET_STRING_SIZE(h))
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#define H_GET_HEADER_SIZE(h) (sizeof(struct exec))
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#define H_GET_TEXT_SIZE(h) ((h)->header.a_text)
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#define H_GET_DATA_SIZE(h) ((h)->header.a_data)
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#define H_GET_BSS_SIZE(h) ((h)->header.a_bss)
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#define H_GET_TEXT_RELOCATION_SIZE(h) ((h)->header.a_trsize)
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#define H_GET_DATA_RELOCATION_SIZE(h) ((h)->header.a_drsize)
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#define H_GET_SYMBOL_TABLE_SIZE(h) ((h)->header.a_syms)
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#define H_GET_MAGIC_NUMBER(h) ((h)->header.a_info)
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#define H_GET_ENTRY_POINT(h) ((h)->header.a_entry)
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#define H_GET_STRING_SIZE(h) ((h)->string_table_size)
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#define H_GET_LINENO_SIZE(h) (0)
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#ifdef EXEC_MACHINE_TYPE
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#define H_GET_MACHINE_TYPE(h) ((h)->header.a_machtype)
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#endif /* EXEC_MACHINE_TYPE */
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#ifdef EXEC_VERSION
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#define H_GET_VERSION(h) ((h)->header.a_version)
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#endif /* EXEC_VERSION */
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#define H_SET_TEXT_SIZE(h,v) ((h)->header.a_text = md_section_align(SEG_TEXT, (v)))
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#define H_SET_DATA_SIZE(h,v) ((h)->header.a_data = md_section_align(SEG_DATA, (v)))
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#define H_SET_BSS_SIZE(h,v) ((h)->header.a_bss = md_section_align(SEG_BSS, (v)))
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#define H_SET_RELOCATION_SIZE(h,t,d) (H_SET_TEXT_RELOCATION_SIZE((h),(t)),\
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H_SET_DATA_RELOCATION_SIZE((h),(d)))
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#define H_SET_TEXT_RELOCATION_SIZE(h,v) ((h)->header.a_trsize = (v))
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#define H_SET_DATA_RELOCATION_SIZE(h,v) ((h)->header.a_drsize = (v))
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#define H_SET_SYMBOL_TABLE_SIZE(h,v) ((h)->header.a_syms = (v) * \
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sizeof(struct nlist))
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#define H_SET_MAGIC_NUMBER(h,v) ((h)->header.a_info = (v))
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#define H_SET_ENTRY_POINT(h,v) ((h)->header.a_entry = (v))
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#define H_SET_STRING_SIZE(h,v) ((h)->string_table_size = (v))
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#ifdef EXEC_MACHINE_TYPE
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#define H_SET_MACHINE_TYPE(h,v) ((h)->header.a_machtype = (v))
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#endif /* EXEC_MACHINE_TYPE */
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#ifdef EXEC_VERSION
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#define H_SET_VERSION(h,v) ((h)->header.a_version = (v))
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#endif /* EXEC_VERSION */
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/*
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* Current means for getting the name of a segment.
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* This will change for infinite-segments support (e.g. COFF).
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*/
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#define segment_name(seg) ( seg_name[(int)(seg)] )
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extern char *const seg_name[];
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typedef struct {
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struct exec header; /* a.out header */
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long string_table_size; /* names + '\0' + sizeof(int) */
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} object_headers;
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/* line numbering stuff. */
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#define OBJ_EMIT_LINENO(a, b, c) ;
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#define obj_pre_write_hook(a) ;
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/*
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* Local Variables:
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* comment-column: 0
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* fill-column: 131
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* End:
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*/
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/* end of obj-aout.h */
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