1 /* IBM RS/6000 "XCOFF" file definitions for BFD.
2 Copyright (C) 1990, 1991, 2001, 2010 Free Software Foundation, Inc.
3 Written by Mimi Phuong-Thao Vo of IBM
4 and John Gilmore of Cygnus Support.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
21 /********************** FILE HEADER **********************/
23 struct external_filehdr {
24 char f_magic[2]; /* magic number */
25 char f_nscns[2]; /* number of sections */
26 char f_timdat[4]; /* time & date stamp */
27 char f_symptr[4]; /* file pointer to symtab */
28 char f_nsyms[4]; /* number of symtab entries */
29 char f_opthdr[2]; /* sizeof(optional hdr) */
30 char f_flags[2]; /* flags */
34 #define U802WRMAGIC 0730 /* writeable text segments **chh** */
35 #define U802ROMAGIC 0735 /* readonly sharable text segments */
36 #define U802TOCMAGIC 0737 /* readonly text segments and TOC */
39 ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
40 (x).f_magic != U802TOCMAGIC)
42 #define FILHDR struct external_filehdr
46 /********************** AOUT "OPTIONAL HEADER" **********************/
51 unsigned char magic[2]; /* type of file */
52 unsigned char vstamp[2]; /* version stamp */
53 unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */
54 unsigned char dsize[4]; /* initialized data " " */
55 unsigned char bsize[4]; /* uninitialized data " " */
56 unsigned char entry[4]; /* entry pt. */
57 unsigned char text_start[4]; /* base of text used for this file */
58 unsigned char data_start[4]; /* base of data used for this file */
59 unsigned char o_toc[4]; /* address of TOC */
60 unsigned char o_snentry[2]; /* section number of entry point */
61 unsigned char o_sntext[2]; /* section number of .text section */
62 unsigned char o_sndata[2]; /* section number of .data section */
63 unsigned char o_sntoc[2]; /* section number of TOC */
64 unsigned char o_snloader[2]; /* section number of .loader section */
65 unsigned char o_snbss[2]; /* section number of .bss section */
66 unsigned char o_algntext[2]; /* .text alignment */
67 unsigned char o_algndata[2]; /* .data alignment */
68 unsigned char o_modtype[2]; /* module type (??) */
69 unsigned char o_cputype[2]; /* cpu type */
70 unsigned char o_maxstack[4]; /* max stack size (??) */
71 unsigned char o_maxdata[4]; /* max data size (??) */
72 unsigned char o_resv2[12]; /* reserved */
77 #define SMALL_AOUTSZ (28)
80 /********************** SECTION HEADER **********************/
83 struct external_scnhdr {
84 char s_name[8]; /* section name */
85 char s_paddr[4]; /* physical address, aliased s_nlib */
86 char s_vaddr[4]; /* virtual address */
87 char s_size[4]; /* section size */
88 char s_scnptr[4]; /* file ptr to raw data for section */
89 char s_relptr[4]; /* file ptr to relocation */
90 char s_lnnoptr[4]; /* file ptr to line numbers */
91 char s_nreloc[2]; /* number of relocation entries */
92 char s_nlnno[2]; /* number of line number entries*/
93 char s_flags[4]; /* flags */
96 #define SCNHDR struct external_scnhdr
99 /********************** LINE NUMBERS **********************/
101 /* 1 line number entry for every "breakpointable" source line in a section.
102 * Line numbers are grouped on a per function basis; first entry in a function
103 * grouping will have l_lnno = 0 and in place of physical address will be the
104 * symbol table index of the function name.
106 struct external_lineno {
108 char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
109 char l_paddr[4]; /* (physical) address of line number */
111 char l_lnno[2]; /* line number */
115 #define LINENO struct external_lineno
119 /********************** SYMBOLS **********************/
121 #define E_SYMNMLEN 8 /* # characters in a symbol name */
122 #define E_FILNMLEN 14 /* # characters in a file name */
123 #define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
125 struct external_syment
128 char e_name[E_SYMNMLEN];
143 #define N_BTMASK (017)
144 #define N_TMASK (060)
149 union external_auxent {
151 char x_tagndx[4]; /* str, un, or enum tag indx */
154 char x_lnno[2]; /* declaration line number */
155 char x_size[2]; /* str/union/array size */
157 char x_fsize[4]; /* size of function */
160 struct { /* if ISFCN, tag, or .bb */
161 char x_lnnoptr[4]; /* ptr to fcn line # */
162 char x_endndx[4]; /* entry ndx past block end */
164 struct { /* if ISARY, up to 4 dimen. */
165 char x_dimen[E_DIMNUM][2];
168 char x_tvndx[2]; /* tv index */
172 char x_fname[E_FILNMLEN];
180 char x_scnlen[4]; /* section length */
181 char x_nreloc[2]; /* # relocation entries */
182 char x_nlinno[2]; /* # line numbers */
186 char x_tvfill[4]; /* tv fill value */
187 char x_tvlen[2]; /* length of .tv */
188 char x_tvran[2][2]; /* tv range */
189 } x_tv; /* info about .tv section (in auxent of symbol .tv)) */
192 unsigned char x_scnlen[4];
193 unsigned char x_parmhash[4];
194 unsigned char x_snhash[2];
195 unsigned char x_smtyp[1];
196 unsigned char x_smclas[1];
197 unsigned char x_stab[4];
198 unsigned char x_snstab[2];
203 #define SYMENT struct external_syment
205 #define AUXENT union external_auxent
207 #define DBXMASK 0x80 /* for dbx storage mask */
208 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
212 /********************** RELOCATION DIRECTIVES **********************/
215 struct external_reloc {
223 #define RELOC struct external_reloc
226 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
227 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
228 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
229 /* For new sections we havn't heard of before */
230 #define DEFAULT_SECTION_ALIGNMENT 4
232 /* The ldhdr structure. This appears at the start of the .loader
235 struct external_ldhdr
237 bfd_byte l_version[4];
239 bfd_byte l_nreloc[4];
240 bfd_byte l_istlen[4];
241 bfd_byte l_nimpid[4];
242 bfd_byte l_impoff[4];
247 #define LDHDRSZ (8 * 4)
249 struct external_ldsym
253 bfd_byte _l_name[E_SYMNMLEN];
256 bfd_byte _l_zeroes[4];
257 bfd_byte _l_offset[4];
262 bfd_byte l_smtype[1];
263 bfd_byte l_smclas[1];
268 #define LDSYMSZ (8 + 3 * 4 + 2 + 2)
270 struct external_ldrel
273 bfd_byte l_symndx[4];
275 bfd_byte l_rsecnm[2];
278 #define LDRELSZ (2 * 4 + 2 * 2)
280 struct external_exceptab
283 bfd_byte e_symndx[4];
287 bfd_byte e_reason[1];
290 #define EXCEPTSZ (4 + 2)