| 1 | /* b.out object file format
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| 2 | Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 2000,
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| 3 | 2002, 2003 Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is part of GAS, the GNU Assembler.
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| 6 |
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| 7 | GAS is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as
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| 9 | published by the Free Software Foundation; either version 2,
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| 10 | or (at your option) any later version.
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| 11 |
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| 12 | GAS is distributed in the hope that it will be useful, but
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| 13 | WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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| 15 | the GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public
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| 18 | License along with GAS; see the file COPYING. If not, write
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| 19 | to the Free Software Foundation, 59 Temple Place - Suite 330, Cambridge, MA
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| 20 | 02139, USA. */
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| 21 |
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| 22 | /*
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| 23 | * This file is a modified version of 'a.out.h'. It is to be used in all GNU
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| 24 | * tools modified to support the i80960 b.out format (or tools that operate on
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| 25 | * object files created by such tools).
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| 26 | *
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| 27 | * All i80960 development is done in a CROSS-DEVELOPMENT environment. I.e.,
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| 28 | * object code is generated on, and executed under the direction of a symbolic
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| 29 | * debugger running on, a host system. We do not want to be subject to the
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| 30 | * vagaries of which host it is or whether it supports COFF or a.out format, or
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| 31 | * anything else. We DO want to:
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| 32 | *
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| 33 | * o always generate the same format object files, regardless of host.
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| 34 | *
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| 35 | * o have an 'a.out' header that we can modify for our own purposes
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| 36 | * (the 80960 is typically an embedded processor and may require
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| 37 | * enhanced linker support that the normal a.out.h header can't
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| 38 | * accommodate).
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| 39 | *
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| 40 | * As for byte-ordering, the following rules apply:
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| 41 | *
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| 42 | * o Text and data that is actually downloaded to the target is always
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| 43 | * in i80960 (little-endian) order.
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| 44 | *
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| 45 | * o All other numbers (in the header, symbols, relocation directives)
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| 46 | * are in host byte-order: object files CANNOT be lifted from a
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| 47 | * little-end host and used on a big-endian (or vice versa) without
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| 48 | * modification.
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| 49 | * ==> THIS IS NO LONGER TRUE USING BFD. WE CAN GENERATE ANY BYTE ORDER
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| 50 | * FOR THE HEADER, AND READ ANY BYTE ORDER. PREFERENCE WOULD BE TO
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| 51 | * USE LITTLE-ENDIAN BYTE ORDER THROUGHOUT, REGARDLESS OF HOST. <==
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| 52 | *
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| 53 | * o The downloader ('comm960') takes care to generate a pseudo-header
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| 54 | * with correct (i80960) byte-ordering before shipping text and data
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| 55 | * off to the NINDY monitor in the target systems. Symbols and
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| 56 | * relocation info are never sent to the target.
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| 57 | */
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| 58 |
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| 59 | #define OBJ_BOUT 1
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| 60 |
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| 61 | #define OUTPUT_FLAVOR bfd_target_aout_flavour
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| 62 |
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| 63 | #include "targ-cpu.h"
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| 64 |
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| 65 | #define OBJ_DEFAULT_OUTPUT_FILE_NAME "b.out"
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| 66 |
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| 67 | extern const short seg_N_TYPE[];
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| 68 | extern const segT N_TYPE_seg[];
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| 69 |
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| 70 | #define BMAGIC 0415
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| 71 | /* We don't accept the following (see N_BADMAG macro).
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| 72 | * They're just here so GNU code will compile.
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| 73 | */
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| 74 | #define OMAGIC 0407 /* old impure format */
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| 75 | #define NMAGIC 0410 /* read-only text */
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| 76 | #define ZMAGIC 0413 /* demand load format */
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| 77 |
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| 78 | #ifndef DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE
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| 79 | #define DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE (BMAGIC)
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| 80 | #endif /* DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE */
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| 81 |
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| 82 | /* FILE HEADER
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| 83 | * All 'lengths' are given as a number of bytes.
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| 84 | * All 'alignments' are for relinkable files only; an alignment of
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| 85 | * 'n' indicates the corresponding segment must begin at an
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| 86 | * address that is a multiple of (2**n).
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| 87 | */
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| 88 | struct exec
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| 89 | {
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| 90 | /* Standard stuff */
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| 91 | unsigned long a_magic; /* Identifies this as a b.out file */
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| 92 | unsigned long a_text; /* Length of text */
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| 93 | unsigned long a_data; /* Length of data */
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| 94 | unsigned long a_bss; /* Length of runtime uninitialized data area */
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| 95 | unsigned long a_syms; /* Length of symbol table */
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| 96 | unsigned long a_entry; /* Runtime start address */
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| 97 | unsigned long a_trsize; /* Length of text relocation info */
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| 98 | unsigned long a_drsize; /* Length of data relocation info */
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| 99 |
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| 100 | /* Added for i960 */
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| 101 | unsigned long a_tload; /* Text runtime load address */
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| 102 | unsigned long a_dload; /* Data runtime load address */
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| 103 | unsigned char a_talign; /* Alignment of text segment */
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| 104 | unsigned char a_dalign; /* Alignment of data segment */
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| 105 | unsigned char a_balign; /* Alignment of bss segment */
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| 106 | unsigned char a_relaxable; /* Contains enough info to relax */
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| 107 | };
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| 108 |
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| 109 | #define N_BADMAG(x) (((x).a_magic)!=BMAGIC)
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| 110 | #define N_TXTOFF(x) ( sizeof (struct exec) )
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| 111 | #define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
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| 112 | #define N_TROFF(x) ( N_DATOFF(x) + (x).a_data )
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| 113 | #define N_DROFF(x) ( N_TROFF(x) + (x).a_trsize )
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| 114 | #define N_SYMOFF(x) ( N_DROFF(x) + (x).a_drsize )
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| 115 | #define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
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| 116 |
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| 117 | /* A single entry in the symbol table
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| 118 | */
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| 119 | struct nlist
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| 120 | {
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| 121 | union
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| 122 | {
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| 123 | char *n_name;
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| 124 | struct nlist *n_next;
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| 125 | long n_strx; /* Index into string table */
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| 126 | }
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| 127 | n_un;
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| 128 | unsigned char n_type; /* See below */
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| 129 | char n_other; /* Used in i80960 support -- see below */
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| 130 | short n_desc;
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| 131 | unsigned long n_value;
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| 132 | };
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| 133 |
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| 134 | typedef struct nlist obj_symbol_type;
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| 135 |
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| 136 | /* Legal values of n_type
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| 137 | */
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| 138 | #define N_UNDF 0 /* Undefined symbol */
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| 139 | #define N_ABS 2 /* Absolute symbol */
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| 140 | #define N_TEXT 4 /* Text symbol */
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| 141 | #define N_DATA 6 /* Data symbol */
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| 142 | #define N_BSS 8 /* BSS symbol */
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| 143 | #define N_FN 31 /* Filename symbol */
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| 144 |
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| 145 | #define N_EXT 1 /* External symbol (OR'd in with one of above) */
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| 146 | #define N_TYPE 036 /* Mask for all the type bits */
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| 147 | #define N_STAB 0340 /* Mask for all bits used for SDB entries */
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| 148 |
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| 149 | #ifndef CUSTOM_RELOC_FORMAT
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| 150 | struct relocation_info
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| 151 | {
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| 152 | int r_address; /* File address of item to be relocated */
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| 153 | unsigned
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| 154 | r_index:24, /* Index of symbol on which relocation is based*/
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| 155 | r_pcrel:1, /* 1 => relocate PC-relative; else absolute
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| 156 | * On i960, pc-relative implies 24-bit
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| 157 | * address, absolute implies 32-bit.
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| 158 | */
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| 159 | r_length:2, /* Number of bytes to relocate:
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| 160 | * 0 => 1 byte
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| 161 | * 1 => 2 bytes
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| 162 | * 2 => 4 bytes -- only value used for i960
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| 163 | */
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| 164 | r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */
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| 165 | r_disp:1, /* Something for the GNU NS32K assembler */
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| 166 | r_callj:1, /* 1 if relocation target is an i960 'callj' */
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| 167 | nuthin:1; /* Unused */
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| 168 | };
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| 169 |
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| 170 | #endif /* CUSTOM_RELOC_FORMAT */
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| 171 |
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| 172 | /*
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| 173 | * Macros to extract information from a symbol table entry.
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| 174 | * This syntaxic indirection allows independence regarding a.out or coff.
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| 175 | * The argument (s) of all these macros is a pointer to a symbol table entry.
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| 176 | */
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| 177 |
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| 178 | /* Predicates */
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| 179 | /* True if the symbol is external */
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| 180 | #define S_IS_EXTERNAL(s) ((s)->sy_symbol.n_type & N_EXT)
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| 181 |
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| 182 | /* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT */
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| 183 | #define S_IS_DEFINED(s) ((S_GET_TYPE(s) != N_UNDF) || (S_GET_DESC(s) != 0))
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| 184 |
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| 185 | /* Return true for symbols that should not be reduced to section
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| 186 | symbols or eliminated from expressions, because they may be
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| 187 | overridden by the linker. */
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| 188 | #define S_FORCE_RELOC(s, strict) \
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| 189 | (!SEG_NORMAL (S_GET_SEGMENT (s)))
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| 190 |
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| 191 | #define S_IS_COMMON(s) \
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| 192 | (S_GET_TYPE (s) == N_UNDF && S_GET_VALUE (s) != 0)
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| 193 |
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| 194 | #define S_IS_REGISTER(s) ((s)->sy_symbol.n_type == N_REGISTER)
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| 195 |
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| 196 | /* True if a debug special symbol entry */
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| 197 | #define S_IS_DEBUG(s) ((s)->sy_symbol.n_type & N_STAB)
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| 198 | /* True if a symbol is local symbol name */
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| 199 | #define S_IS_LOCAL(s) \
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| 200 | ((S_GET_NAME (s) \
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| 201 | && !S_IS_DEBUG (s) \
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| 202 | && (strchr (S_GET_NAME (s), '\001') != NULL \
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| 203 | || strchr (S_GET_NAME (s), '\002') != NULL \
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| 204 | || (S_LOCAL_NAME(s) && !flag_keep_locals))) \
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| 205 | || (flag_strip_local_absolute \
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| 206 | && !S_IS_EXTERNAL(s) \
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| 207 | && S_GET_SEGMENT(s) == absolute_section))
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| 208 | /* True if a symbol is not defined in this file */
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| 209 | #define S_IS_EXTERN(s) ((s)->sy_symbol.n_type & N_EXT)
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| 210 | /* True if the symbol has been generated because of a .stabd directive */
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| 211 | #define S_IS_STABD(s) (S_GET_NAME(s) == NULL)
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| 212 |
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| 213 | /* Accessors */
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| 214 | /* The name of the symbol */
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| 215 | #define S_GET_NAME(s) ((s)->sy_symbol.n_un.n_name)
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| 216 | /* The pointer to the string table */
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| 217 | #define S_GET_OFFSET(s) ((s)->sy_symbol.n_un.n_strx)
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| 218 | /* The type of the symbol */
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| 219 | #define S_GET_TYPE(s) ((s)->sy_symbol.n_type & N_TYPE)
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| 220 | /* The numeric value of the segment */
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| 221 | #define S_GET_SEGMENT(s) (N_TYPE_seg[S_GET_TYPE(s)])
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| 222 | /* The n_other expression value */
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| 223 | #define S_GET_OTHER(s) ((s)->sy_symbol.n_other)
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| 224 | /* The n_desc expression value */
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| 225 | #define S_GET_DESC(s) ((s)->sy_symbol.n_desc)
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| 226 |
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| 227 | /* Modifiers */
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| 228 | /* Assume that a symbol cannot be simultaneously in more than on segment */
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| 229 | /* set segment */
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| 230 | #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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| 231 | /* The symbol is external */
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| 232 | #define S_SET_EXTERNAL(s) ((s)->sy_symbol.n_type |= N_EXT)
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| 233 | /* The symbol is not external */
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| 234 | #define S_CLEAR_EXTERNAL(s) ((s)->sy_symbol.n_type &= ~N_EXT)
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| 235 | /* Set the name of the symbol */
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| 236 | #define S_SET_NAME(s,v) ((s)->sy_symbol.n_un.n_name = (v))
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| 237 | /* Set the offset in the string table */
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| 238 | #define S_SET_OFFSET(s,v) ((s)->sy_symbol.n_un.n_strx = (v))
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| 239 | /* Set the n_other expression value */
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| 240 | #define S_SET_OTHER(s,v) ((s)->sy_symbol.n_other = (v))
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| 241 | /* Set the n_desc expression value */
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| 242 | #define S_SET_DESC(s,v) ((s)->sy_symbol.n_desc = (v))
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| 243 | /* Set the n_type value */
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| 244 | #define S_SET_TYPE(s,v) ((s)->sy_symbol.n_type = (v))
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| 245 |
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| 246 | /* File header macro and type definition */
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| 247 |
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| 248 | #define H_GET_FILE_SIZE(h) (sizeof (struct exec) + \
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| 249 | H_GET_TEXT_SIZE(h) + H_GET_DATA_SIZE(h) + \
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| 250 | H_GET_SYMBOL_TABLE_SIZE(h) + \
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| 251 | H_GET_TEXT_RELOCATION_SIZE(h) + \
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| 252 | H_GET_DATA_RELOCATION_SIZE(h) + \
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| 253 | (h)->string_table_size)
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| 254 |
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| 255 | #define H_GET_HEADER_SIZE(h) (sizeof (struct exec))
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| 256 | #define H_GET_TEXT_SIZE(h) ((h)->header.a_text)
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| 257 | #define H_GET_DATA_SIZE(h) ((h)->header.a_data)
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| 258 | #define H_GET_BSS_SIZE(h) ((h)->header.a_bss)
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| 259 | #define H_GET_TEXT_RELOCATION_SIZE(h) ((h)->header.a_trsize)
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| 260 | #define H_GET_DATA_RELOCATION_SIZE(h) ((h)->header.a_drsize)
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| 261 | #define H_GET_SYMBOL_TABLE_SIZE(h) ((h)->header.a_syms)
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| 262 | #define H_GET_MAGIC_NUMBER(h) ((h)->header.a_info)
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| 263 | #define H_GET_ENTRY_POINT(h) ((h)->header.a_entry)
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| 264 | #define H_GET_STRING_SIZE(h) ((h)->string_table_size)
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| 265 | #define H_GET_LINENO_SIZE(h) (0)
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| 266 |
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| 267 | #ifdef EXEC_MACHINE_TYPE
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| 268 | #define H_GET_MACHINE_TYPE(h) ((h)->header.a_machtype)
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| 269 | #endif /* EXEC_MACHINE_TYPE */
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| 270 | #ifdef EXEC_VERSION
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| 271 | #define H_GET_VERSION(h) ((h)->header.a_version)
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| 272 | #endif /* EXEC_VERSION */
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| 273 |
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| 274 | #define H_SET_TEXT_SIZE(h,v) ((h)->header.a_text = (v))
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| 275 | #define H_SET_DATA_SIZE(h,v) ((h)->header.a_data = (v))
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| 276 | #define H_SET_BSS_SIZE(h,v) ((h)->header.a_bss = (v))
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| 277 |
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| 278 | #define H_SET_RELOCATION_SIZE(h,t,d) (H_SET_TEXT_RELOCATION_SIZE((h),(t)),\
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| 279 | H_SET_DATA_RELOCATION_SIZE((h),(d)))
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| 280 |
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| 281 | #define H_SET_TEXT_RELOCATION_SIZE(h,v) ((h)->header.a_trsize = (v))
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| 282 | #define H_SET_DATA_RELOCATION_SIZE(h,v) ((h)->header.a_drsize = (v))
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| 283 | #define H_SET_SYMBOL_TABLE_SIZE(h,v) ((h)->header.a_syms = (v) * \
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| 284 | sizeof (struct nlist))
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| 285 |
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| 286 | #define H_SET_MAGIC_NUMBER(h,v) ((h)->header.a_magic = (v))
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| 287 |
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| 288 | #define H_SET_ENTRY_POINT(h,v) ((h)->header.a_entry = (v))
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| 289 | #define H_SET_STRING_SIZE(h,v) ((h)->string_table_size = (v))
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| 290 | #ifdef EXEC_MACHINE_TYPE
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| 291 | #define H_SET_MACHINE_TYPE(h,v) ((h)->header.a_machtype = (v))
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| 292 | #endif /* EXEC_MACHINE_TYPE */
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| 293 | #ifdef EXEC_VERSION
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| 294 | #define H_SET_VERSION(h,v) ((h)->header.a_version = (v))
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| 295 | #endif /* EXEC_VERSION */
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| 296 |
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| 297 | typedef struct
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| 298 | {
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| 299 | struct exec header; /* a.out header */
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| 300 | long string_table_size; /* names + '\0' + sizeof (int) */
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| 301 | }
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| 302 |
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| 303 | object_headers;
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| 304 |
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| 305 | /* unused hooks. */
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| 306 | #define OBJ_EMIT_LINENO(a, b, c) {;}
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| 307 | #define obj_pre_write_hook(a) {;}
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| 308 |
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| 309 | #if __STDC__
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| 310 | struct fix;
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| 311 | #endif
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| 312 | extern void tc_aout_fix_to_chars PARAMS ((char *where,
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| 313 | struct fix *fixP,
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| 314 | relax_addressT segment_address));
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| 315 | extern void tc_bout_fix_to_chars PARAMS ((char *where,
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| 316 | struct fix *fixP,
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| 317 | relax_addressT segment_address));
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| 318 |
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| 319 | #define AOUT_STABS
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