| 1 | /* This file is a modified version of 'a.out.h'. It is to be used in all
|
|---|
| 2 | GNU tools modified to support the i80960 (or tools that operate on
|
|---|
| 3 | object files created by such tools).
|
|---|
| 4 |
|
|---|
| 5 | Copyright 2001 Free Software Foundation, Inc.
|
|---|
| 6 |
|
|---|
| 7 | This program is free software; you can redistribute it and/or modify
|
|---|
| 8 | it under the terms of the GNU General Public License as published by
|
|---|
| 9 | the Free Software Foundation; either version 2 of the License, or
|
|---|
| 10 | (at your option) any later version.
|
|---|
| 11 |
|
|---|
| 12 | This program is distributed in the hope that it will be useful,
|
|---|
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 15 | GNU General Public License for more details.
|
|---|
| 16 |
|
|---|
| 17 | You should have received a copy of the GNU General Public License
|
|---|
| 18 | along with this program; if not, write to the Free Software
|
|---|
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
|---|
| 20 |
|
|---|
| 21 | /* All i80960 development is done in a CROSS-DEVELOPMENT environment. I.e.,
|
|---|
| 22 | object code is generated on, and executed under the direction of a symbolic
|
|---|
| 23 | debugger running on, a host system. We do not want to be subject to the
|
|---|
| 24 | vagaries of which host it is or whether it supports COFF or a.out format,
|
|---|
| 25 | or anything else. We DO want to:
|
|---|
| 26 |
|
|---|
| 27 | o always generate the same format object files, regardless of host.
|
|---|
| 28 |
|
|---|
| 29 | o have an 'a.out' header that we can modify for our own purposes
|
|---|
| 30 | (the 80960 is typically an embedded processor and may require
|
|---|
| 31 | enhanced linker support that the normal a.out.h header can't
|
|---|
| 32 | accommodate).
|
|---|
| 33 |
|
|---|
| 34 | As for byte-ordering, the following rules apply:
|
|---|
| 35 |
|
|---|
| 36 | o Text and data that is actually downloaded to the target is always
|
|---|
| 37 | in i80960 (little-endian) order.
|
|---|
| 38 |
|
|---|
| 39 | o All other numbers (in the header, symbols, relocation directives)
|
|---|
| 40 | are in host byte-order: object files CANNOT be lifted from a
|
|---|
| 41 | little-end host and used on a big-endian (or vice versa) without
|
|---|
| 42 | modification.
|
|---|
| 43 | ==> THIS IS NO LONGER TRUE USING BFD. WE CAN GENERATE ANY BYTE ORDER
|
|---|
| 44 | FOR THE HEADER, AND READ ANY BYTE ORDER. PREFERENCE WOULD BE TO
|
|---|
| 45 | USE LITTLE-ENDIAN BYTE ORDER THROUGHOUT, REGARDLESS OF HOST. <==
|
|---|
| 46 |
|
|---|
| 47 | o The downloader ('comm960') takes care to generate a pseudo-header
|
|---|
| 48 | with correct (i80960) byte-ordering before shipping text and data
|
|---|
| 49 | off to the NINDY monitor in the target systems. Symbols and
|
|---|
| 50 | relocation info are never sent to the target. */
|
|---|
| 51 |
|
|---|
| 52 | #define BMAGIC 0415
|
|---|
| 53 | /* We don't accept the following (see N_BADMAG macro).
|
|---|
| 54 | * They're just here so GNU code will compile.
|
|---|
| 55 | */
|
|---|
| 56 | #define OMAGIC 0407 /* old impure format */
|
|---|
| 57 | #define NMAGIC 0410 /* read-only text */
|
|---|
| 58 | #define ZMAGIC 0413 /* demand load format */
|
|---|
| 59 |
|
|---|
| 60 | /* FILE HEADER
|
|---|
| 61 | * All 'lengths' are given as a number of bytes.
|
|---|
| 62 | * All 'alignments' are for relinkable files only; an alignment of
|
|---|
| 63 | * 'n' indicates the corresponding segment must begin at an
|
|---|
| 64 | * address that is a multiple of (2**n).
|
|---|
| 65 | */
|
|---|
| 66 | struct external_exec {
|
|---|
| 67 | /* Standard stuff */
|
|---|
| 68 | unsigned char e_info[4]; /* Identifies this as a b.out file */
|
|---|
| 69 | unsigned char e_text[4]; /* Length of text */
|
|---|
| 70 | unsigned char e_data[4]; /* Length of data */
|
|---|
| 71 | unsigned char e_bss[4]; /* Length of uninitialized data area */
|
|---|
| 72 | unsigned char e_syms[4]; /* Length of symbol table */
|
|---|
| 73 | unsigned char e_entry[4]; /* Runtime start address */
|
|---|
| 74 | unsigned char e_trsize[4]; /* Length of text relocation info */
|
|---|
| 75 | unsigned char e_drsize[4]; /* Length of data relocation info */
|
|---|
| 76 |
|
|---|
| 77 | /* Added for i960 */
|
|---|
| 78 | unsigned char e_tload[4]; /* Text runtime load address */
|
|---|
| 79 | unsigned char e_dload[4]; /* Data runtime load address */
|
|---|
| 80 | unsigned char e_talign[1]; /* Alignment of text segment */
|
|---|
| 81 | unsigned char e_dalign[1]; /* Alignment of data segment */
|
|---|
| 82 | unsigned char e_balign[1]; /* Alignment of bss segment */
|
|---|
| 83 | unsigned char e_relaxable[1]; /* Assembled with enough info to allow linker to relax */
|
|---|
| 84 | };
|
|---|
| 85 |
|
|---|
| 86 | #define EXEC_BYTES_SIZE (sizeof (struct external_exec))
|
|---|
| 87 |
|
|---|
| 88 | /* These macros use the a_xxx field names, since they operate on the exec
|
|---|
| 89 | structure after it's been byte-swapped and realigned on the host machine. */
|
|---|
| 90 | #define N_BADMAG(x) (((x).a_info)!=BMAGIC)
|
|---|
| 91 | #define N_TXTOFF(x) EXEC_BYTES_SIZE
|
|---|
| 92 | #define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text )
|
|---|
| 93 | #define N_TROFF(x) ( N_DATOFF(x) + (x).a_data )
|
|---|
| 94 | #define N_TRELOFF N_TROFF
|
|---|
| 95 | #define N_DROFF(x) ( N_TROFF(x) + (x).a_trsize )
|
|---|
| 96 | #define N_DRELOFF N_DROFF
|
|---|
| 97 | #define N_SYMOFF(x) ( N_DROFF(x) + (x).a_drsize )
|
|---|
| 98 | #define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms )
|
|---|
| 99 | #define N_DATADDR(x) ( (x).a_dload )
|
|---|
| 100 |
|
|---|
| 101 | /* Address of text segment in memory after it is loaded. */
|
|---|
| 102 | #if !defined (N_TXTADDR)
|
|---|
| 103 | #define N_TXTADDR(x) 0
|
|---|
| 104 | #endif
|
|---|
| 105 |
|
|---|
| 106 | /* A single entry in the symbol table
|
|---|
| 107 | */
|
|---|
| 108 | struct nlist {
|
|---|
| 109 | union {
|
|---|
| 110 | char *n_name;
|
|---|
| 111 | struct nlist *n_next;
|
|---|
| 112 | long n_strx; /* Index into string table */
|
|---|
| 113 | } n_un;
|
|---|
| 114 | unsigned char n_type; /* See below */
|
|---|
| 115 | char n_other; /* Used in i80960 support -- see below */
|
|---|
| 116 | short n_desc;
|
|---|
| 117 | unsigned long n_value;
|
|---|
| 118 | };
|
|---|
| 119 |
|
|---|
| 120 |
|
|---|
| 121 | /* Legal values of n_type
|
|---|
| 122 | */
|
|---|
| 123 | #define N_UNDF 0 /* Undefined symbol */
|
|---|
| 124 | #define N_ABS 2 /* Absolute symbol */
|
|---|
| 125 | #define N_TEXT 4 /* Text symbol */
|
|---|
| 126 | #define N_DATA 6 /* Data symbol */
|
|---|
| 127 | #define N_BSS 8 /* BSS symbol */
|
|---|
| 128 | #define N_FN 31 /* Filename symbol */
|
|---|
| 129 |
|
|---|
| 130 | #define N_EXT 1 /* External symbol (OR'd in with one of above) */
|
|---|
| 131 | #define N_TYPE 036 /* Mask for all the type bits */
|
|---|
| 132 | #define N_STAB 0340 /* Mask for all bits used for SDB entries */
|
|---|
| 133 |
|
|---|
| 134 | /* MEANING OF 'n_other'
|
|---|
| 135 | *
|
|---|
| 136 | * If non-zero, the 'n_other' fields indicates either a leaf procedure or
|
|---|
| 137 | * a system procedure, as follows:
|
|---|
| 138 | *
|
|---|
| 139 | * 1 <= n_other <= 32 :
|
|---|
| 140 | * The symbol is the entry point to a system procedure.
|
|---|
| 141 | * 'n_value' is the address of the entry, as for any other
|
|---|
| 142 | * procedure. The system procedure number (which can be used in
|
|---|
| 143 | * a 'calls' instruction) is (n_other-1). These entries come from
|
|---|
| 144 | * '.sysproc' directives.
|
|---|
| 145 | *
|
|---|
| 146 | * n_other == N_CALLNAME
|
|---|
| 147 | * the symbol is the 'call' entry point to a leaf procedure.
|
|---|
| 148 | * The *next* symbol in the symbol table must be the corresponding
|
|---|
| 149 | * 'bal' entry point to the procedure (see following). These
|
|---|
| 150 | * entries come from '.leafproc' directives in which two different
|
|---|
| 151 | * symbols are specified (the first one is represented here).
|
|---|
| 152 | *
|
|---|
| 153 | *
|
|---|
| 154 | * n_other == N_BALNAME
|
|---|
| 155 | * the symbol is the 'bal' entry point to a leaf procedure.
|
|---|
| 156 | * These entries result from '.leafproc' directives in which only
|
|---|
| 157 | * one symbol is specified, or in which the same symbol is
|
|---|
| 158 | * specified twice.
|
|---|
| 159 | *
|
|---|
| 160 | * Note that an N_CALLNAME entry *must* have a corresponding N_BALNAME entry,
|
|---|
| 161 | * but not every N_BALNAME entry must have an N_CALLNAME entry.
|
|---|
| 162 | */
|
|---|
| 163 | #define N_CALLNAME ((char)-1)
|
|---|
| 164 | #define N_BALNAME ((char)-2)
|
|---|
| 165 | #define IS_CALLNAME(x) (N_CALLNAME == (x))
|
|---|
| 166 | #define IS_BALNAME(x) (N_BALNAME == (x))
|
|---|
| 167 | #define IS_OTHER(x) ((x)>0 && (x) <=32)
|
|---|
| 168 |
|
|---|
| 169 | #define b_out_relocation_info relocation_info
|
|---|
| 170 | struct relocation_info {
|
|---|
| 171 | int r_address; /* File address of item to be relocated */
|
|---|
| 172 | unsigned
|
|---|
| 173 | #define r_index r_symbolnum
|
|---|
| 174 | r_symbolnum:24,/* Index of symbol on which relocation is based,
|
|---|
| 175 | * if r_extern is set. Otherwise set to
|
|---|
| 176 | * either N_TEXT, N_DATA, or N_BSS to
|
|---|
| 177 | * indicate section on which relocation is
|
|---|
| 178 | * based.
|
|---|
| 179 | */
|
|---|
| 180 | r_pcrel:1, /* 1 => relocate PC-relative; else absolute
|
|---|
| 181 | * On i960, pc-relative implies 24-bit
|
|---|
| 182 | * address, absolute implies 32-bit.
|
|---|
| 183 | */
|
|---|
| 184 | r_length:2, /* Number of bytes to relocate:
|
|---|
| 185 | * 0 => 1 byte
|
|---|
| 186 | * 1 => 2 bytes -- used for 13 bit pcrel
|
|---|
| 187 | * 2 => 4 bytes
|
|---|
| 188 | */
|
|---|
| 189 | r_extern:1,
|
|---|
| 190 | r_bsr:1, /* Something for the GNU NS32K assembler */
|
|---|
| 191 | r_disp:1, /* Something for the GNU NS32K assembler */
|
|---|
| 192 | r_callj:1, /* 1 if relocation target is an i960 'callj' */
|
|---|
| 193 | r_relaxable:1; /* 1 if enough info is left to relax
|
|---|
| 194 | the data */
|
|---|
| 195 | };
|
|---|
