1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* IBM RS/6000 "XCOFF" file definitions for BFD.
3 Copyright (C) 1990, 1991 Free Software Foundation, Inc.
4 FIXME: Can someone provide a transliteration of this name into ASCII?
5 Using the following chars caused a compiler warning on HIUX (so I replaced
6 them with octal escapes), and isn't useful without an understanding of what
7 character set it is.
8 Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
9 and John Gilmore of Cygnus Support. */
10
11 /********************** FILE HEADER **********************/
12
13 struct external_filehdr {
14 char f_magic[2]; /* magic number */
15 char f_nscns[2]; /* number of sections */
16 char f_timdat[4]; /* time & date stamp */
17 char f_symptr[4]; /* file pointer to symtab */
18 char f_nsyms[4]; /* number of symtab entries */
19 char f_opthdr[2]; /* sizeof(optional hdr) */
20 char f_flags[2]; /* flags */
21 };
22
23 /* IBM RS/6000 */
24 #define U802WRMAGIC 0730 /* writeable text segments **chh** */
25 #define U802ROMAGIC 0735 /* readonly sharable text segments */
26 #define U802TOCMAGIC 0737 /* readonly text segments and TOC */
27
28 #define BADMAG(x) \
29 ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
30 (x).f_magic != U802TOCMAGIC)
31
32 #define FILHDR struct external_filehdr
33 #define FILHSZ 20
34
35
36 /********************** AOUT "OPTIONAL HEADER" **********************/
37
38
39 typedef struct
40 {
41 unsigned char magic[2]; /* type of file */
42 unsigned char vstamp[2]; /* version stamp */
43 unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */
44 unsigned char dsize[4]; /* initialized data " " */
45 unsigned char bsize[4]; /* uninitialized data " " */
46 unsigned char entry[4]; /* entry pt. */
47 unsigned char text_start[4]; /* base of text used for this file */
48 unsigned char data_start[4]; /* base of data used for this file */
49 unsigned char o_toc[4]; /* address of TOC */
50 unsigned char o_snentry[2]; /* section number of entry point */
51 unsigned char o_sntext[2]; /* section number of .text section */
52 unsigned char o_sndata[2]; /* section number of .data section */
53 unsigned char o_sntoc[2]; /* section number of TOC */
54 unsigned char o_snloader[2]; /* section number of .loader section */
55 unsigned char o_snbss[2]; /* section number of .bss section */
56 unsigned char o_algntext[2]; /* .text alignment */
57 unsigned char o_algndata[2]; /* .data alignment */
58 unsigned char o_modtype[2]; /* module type (??) */
59 unsigned char o_cputype[2]; /* cpu type */
60 unsigned char o_maxstack[4]; /* max stack size (??) */
61 unsigned char o_maxdata[4]; /* max data size (??) */
62 unsigned char o_resv2[12]; /* reserved */
63 }
64 AOUTHDR;
65
66 #define AOUTSZ 72
67 #define SMALL_AOUTSZ (28)
68 #define AOUTHDRSZ 72
69
70 #define RS6K_AOUTHDR_OMAGIC 0x0107 /* old: text & data writeable */
71 #define RS6K_AOUTHDR_NMAGIC 0x0108 /* new: text r/o, data r/w */
72 #define RS6K_AOUTHDR_ZMAGIC 0x010B /* paged: text r/o, both page-aligned */
73
74
75 /********************** SECTION HEADER **********************/
76
77
78 struct external_scnhdr {
79 char s_name[8]; /* section name */
80 char s_paddr[4]; /* physical address, aliased s_nlib */
81 char s_vaddr[4]; /* virtual address */
82 char s_size[4]; /* section size */
83 char s_scnptr[4]; /* file ptr to raw data for section */
84 char s_relptr[4]; /* file ptr to relocation */
85 char s_lnnoptr[4]; /* file ptr to line numbers */
86 char s_nreloc[2]; /* number of relocation entries */
87 char s_nlnno[2]; /* number of line number entries*/
88 char s_flags[4]; /* flags */
89 };
90
91 /*
92 * names of "special" sections
93 */
94 #define _TEXT ".text"
95 #define _DATA ".data"
96 #define _BSS ".bss"
97 #define _PAD ".pad"
98 #define _LOADER ".loader"
99
100 #define SCNHDR struct external_scnhdr
101 #define SCNHSZ 40
102
103 /* XCOFF uses a special .loader section with type STYP_LOADER. */
104 #define STYP_LOADER 0x1000
105
106 /* XCOFF uses a special .debug section with type STYP_DEBUG. */
107 #define STYP_DEBUG 0x2000
108
109 /* XCOFF handles line number or relocation overflow by creating
110 another section header with STYP_OVRFLO set. */
111 #define STYP_OVRFLO 0x8000
112
113 /********************** LINE NUMBERS **********************/
114
115 /* 1 line number entry for every "breakpointable" source line in a section.
116 * Line numbers are grouped on a per function basis; first entry in a function
117 * grouping will have l_lnno = 0 and in place of physical address will be the
118 * symbol table index of the function name.
119 */
120 struct external_lineno {
121 union {
122 char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
123 char l_paddr[4]; /* (physical) address of line number */
124 } l_addr;
125 char l_lnno[2]; /* line number */
126 };
127
128
129 #define LINENO struct external_lineno
130 #define LINESZ 6
131
132
133 /********************** SYMBOLS **********************/
134
135 #define E_SYMNMLEN 8 /* # characters in a symbol name */
136 #define E_FILNMLEN 14 /* # characters in a file name */
137 #define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
138
139 struct external_syment
140 {
141 union {
142 char e_name[E_SYMNMLEN];
143 struct {
144 char e_zeroes[4];
145 char e_offset[4];
146 } e;
147 } e;
148 char e_value[4];
149 char e_scnum[2];
150 char e_type[2];
151 char e_sclass[1];
152 char e_numaux[1];
153 };
154
155
156
157 #define N_BTMASK (017)
158 #define N_TMASK (060)
159 #define N_BTSHFT (4)
160 #define N_TSHIFT (2)
161
162
163 union external_auxent {
164 struct {
165 char x_tagndx[4]; /* str, un, or enum tag indx */
166 union {
167 struct {
168 char x_lnno[2]; /* declaration line number */
169 char x_size[2]; /* str/union/array size */
170 } x_lnsz;
171 char x_fsize[4]; /* size of function */
172 } x_misc;
173 union {
174 struct { /* if ISFCN, tag, or .bb */
175 char x_lnnoptr[4]; /* ptr to fcn line # */
176 char x_endndx[4]; /* entry ndx past block end */
177 } x_fcn;
178 struct { /* if ISARY, up to 4 dimen. */
179 char x_dimen[E_DIMNUM][2];
180 } x_ary;
181 } x_fcnary;
182 char x_tvndx[2]; /* tv index */
183 } x_sym;
184
185 union {
186 char x_fname[E_FILNMLEN];
187 struct {
188 char x_zeroes[4];
189 char x_offset[4];
190 } x_n;
191 } x_file;
192
193 struct {
194 char x_scnlen[4]; /* section length */
195 char x_nreloc[2]; /* # relocation entries */
196 char x_nlinno[2]; /* # line numbers */
197 } x_scn;
198
199 struct {
200 char x_tvfill[4]; /* tv fill value */
201 char x_tvlen[2]; /* length of .tv */
202 char x_tvran[2][2]; /* tv range */
203 } x_tv; /* info about .tv section (in auxent of symbol .tv)) */
204
205 struct {
206 unsigned char x_scnlen[4];
207 unsigned char x_parmhash[4];
208 unsigned char x_snhash[2];
209 unsigned char x_smtyp[1];
210 unsigned char x_smclas[1];
211 unsigned char x_stab[4];
212 unsigned char x_snstab[2];
213 } x_csect;
214
215 };
216
217 #define SYMENT struct external_syment
218 #define SYMESZ 18
219 #define AUXENT union external_auxent
220 #define AUXESZ 18
221 #define DBXMASK 0x80 /* for dbx storage mask */
222 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
223
224
225
226 /********************** RELOCATION DIRECTIVES **********************/
227
228
229 struct external_reloc {
230 char r_vaddr[4];
231 char r_symndx[4];
232 char r_size[1];
233 char r_type[1];
234 };
235
236
237 #define RELOC struct external_reloc
238 #define RELSZ 10
239
240 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
241 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
242 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
243 /* For new sections we haven't heard of before */
244 #define DEFAULT_SECTION_ALIGNMENT 4
245
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