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 | |