File: /usr/src/linux/arch/ppc/boot/include/rs6000.h
1 /*
2 * BK Id: SCCS/s.rs6000.h 1.7 05/18/01 15:17:23 cort
3 */
4 /* IBM RS/6000 "XCOFF" file definitions for BFD.
5 Copyright (C) 1990, 1991 Free Software Foundation, Inc.
6 FIXME: Can someone provide a transliteration of this name into ASCII?
7 Using the following chars caused a compiler warning on HIUX (so I replaced
8 them with octal escapes), and isn't useful without an understanding of what
9 character set it is.
10 Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
11 and John Gilmore of Cygnus Support. */
12
13 /********************** FILE HEADER **********************/
14
15 struct external_filehdr {
16 char f_magic[2]; /* magic number */
17 char f_nscns[2]; /* number of sections */
18 char f_timdat[4]; /* time & date stamp */
19 char f_symptr[4]; /* file pointer to symtab */
20 char f_nsyms[4]; /* number of symtab entries */
21 char f_opthdr[2]; /* sizeof(optional hdr) */
22 char f_flags[2]; /* flags */
23 };
24
25 /* IBM RS/6000 */
26 #define U802WRMAGIC 0730 /* writeable text segments **chh** */
27 #define U802ROMAGIC 0735 /* readonly sharable text segments */
28 #define U802TOCMAGIC 0737 /* readonly text segments and TOC */
29
30 #define BADMAG(x) \
31 ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
32 (x).f_magic != U802TOCMAGIC)
33
34 #define FILHDR struct external_filehdr
35 #define FILHSZ 20
36
37
38 /********************** AOUT "OPTIONAL HEADER" **********************/
39
40
41 typedef struct
42 {
43 unsigned char magic[2]; /* type of file */
44 unsigned char vstamp[2]; /* version stamp */
45 unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */
46 unsigned char dsize[4]; /* initialized data " " */
47 unsigned char bsize[4]; /* uninitialized data " " */
48 unsigned char entry[4]; /* entry pt. */
49 unsigned char text_start[4]; /* base of text used for this file */
50 unsigned char data_start[4]; /* base of data used for this file */
51 unsigned char o_toc[4]; /* address of TOC */
52 unsigned char o_snentry[2]; /* section number of entry point */
53 unsigned char o_sntext[2]; /* section number of .text section */
54 unsigned char o_sndata[2]; /* section number of .data section */
55 unsigned char o_sntoc[2]; /* section number of TOC */
56 unsigned char o_snloader[2]; /* section number of .loader section */
57 unsigned char o_snbss[2]; /* section number of .bss section */
58 unsigned char o_algntext[2]; /* .text alignment */
59 unsigned char o_algndata[2]; /* .data alignment */
60 unsigned char o_modtype[2]; /* module type (??) */
61 unsigned char o_cputype[2]; /* cpu type */
62 unsigned char o_maxstack[4]; /* max stack size (??) */
63 unsigned char o_maxdata[4]; /* max data size (??) */
64 unsigned char o_resv2[12]; /* reserved */
65 }
66 AOUTHDR;
67
68 #define AOUTSZ 72
69 #define SMALL_AOUTSZ (28)
70 #define AOUTHDRSZ 72
71
72 #define RS6K_AOUTHDR_OMAGIC 0x0107 /* old: text & data writeable */
73 #define RS6K_AOUTHDR_NMAGIC 0x0108 /* new: text r/o, data r/w */
74 #define RS6K_AOUTHDR_ZMAGIC 0x010B /* paged: text r/o, both page-aligned */
75
76
77 /********************** SECTION HEADER **********************/
78
79
80 struct external_scnhdr {
81 char s_name[8]; /* section name */
82 char s_paddr[4]; /* physical address, aliased s_nlib */
83 char s_vaddr[4]; /* virtual address */
84 char s_size[4]; /* section size */
85 char s_scnptr[4]; /* file ptr to raw data for section */
86 char s_relptr[4]; /* file ptr to relocation */
87 char s_lnnoptr[4]; /* file ptr to line numbers */
88 char s_nreloc[2]; /* number of relocation entries */
89 char s_nlnno[2]; /* number of line number entries*/
90 char s_flags[4]; /* flags */
91 };
92
93 /*
94 * names of "special" sections
95 */
96 #define _TEXT ".text"
97 #define _DATA ".data"
98 #define _BSS ".bss"
99 #define _PAD ".pad"
100 #define _LOADER ".loader"
101
102 #define SCNHDR struct external_scnhdr
103 #define SCNHSZ 40
104
105 /* XCOFF uses a special .loader section with type STYP_LOADER. */
106 #define STYP_LOADER 0x1000
107
108 /* XCOFF uses a special .debug section with type STYP_DEBUG. */
109 #define STYP_DEBUG 0x2000
110
111 /* XCOFF handles line number or relocation overflow by creating
112 another section header with STYP_OVRFLO set. */
113 #define STYP_OVRFLO 0x8000
114
115 /********************** LINE NUMBERS **********************/
116
117 /* 1 line number entry for every "breakpointable" source line in a section.
118 * Line numbers are grouped on a per function basis; first entry in a function
119 * grouping will have l_lnno = 0 and in place of physical address will be the
120 * symbol table index of the function name.
121 */
122 struct external_lineno {
123 union {
124 char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
125 char l_paddr[4]; /* (physical) address of line number */
126 } l_addr;
127 char l_lnno[2]; /* line number */
128 };
129
130
131 #define LINENO struct external_lineno
132 #define LINESZ 6
133
134
135 /********************** SYMBOLS **********************/
136
137 #define E_SYMNMLEN 8 /* # characters in a symbol name */
138 #define E_FILNMLEN 14 /* # characters in a file name */
139 #define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
140
141 struct external_syment
142 {
143 union {
144 char e_name[E_SYMNMLEN];
145 struct {
146 char e_zeroes[4];
147 char e_offset[4];
148 } e;
149 } e;
150 char e_value[4];
151 char e_scnum[2];
152 char e_type[2];
153 char e_sclass[1];
154 char e_numaux[1];
155 };
156
157
158
159 #define N_BTMASK (017)
160 #define N_TMASK (060)
161 #define N_BTSHFT (4)
162 #define N_TSHIFT (2)
163
164
165 union external_auxent {
166 struct {
167 char x_tagndx[4]; /* str, un, or enum tag indx */
168 union {
169 struct {
170 char x_lnno[2]; /* declaration line number */
171 char x_size[2]; /* str/union/array size */
172 } x_lnsz;
173 char x_fsize[4]; /* size of function */
174 } x_misc;
175 union {
176 struct { /* if ISFCN, tag, or .bb */
177 char x_lnnoptr[4]; /* ptr to fcn line # */
178 char x_endndx[4]; /* entry ndx past block end */
179 } x_fcn;
180 struct { /* if ISARY, up to 4 dimen. */
181 char x_dimen[E_DIMNUM][2];
182 } x_ary;
183 } x_fcnary;
184 char x_tvndx[2]; /* tv index */
185 } x_sym;
186
187 union {
188 char x_fname[E_FILNMLEN];
189 struct {
190 char x_zeroes[4];
191 char x_offset[4];
192 } x_n;
193 } x_file;
194
195 struct {
196 char x_scnlen[4]; /* section length */
197 char x_nreloc[2]; /* # relocation entries */
198 char x_nlinno[2]; /* # line numbers */
199 } x_scn;
200
201 struct {
202 char x_tvfill[4]; /* tv fill value */
203 char x_tvlen[2]; /* length of .tv */
204 char x_tvran[2][2]; /* tv range */
205 } x_tv; /* info about .tv section (in auxent of symbol .tv)) */
206
207 struct {
208 unsigned char x_scnlen[4];
209 unsigned char x_parmhash[4];
210 unsigned char x_snhash[2];
211 unsigned char x_smtyp[1];
212 unsigned char x_smclas[1];
213 unsigned char x_stab[4];
214 unsigned char x_snstab[2];
215 } x_csect;
216
217 };
218
219 #define SYMENT struct external_syment
220 #define SYMESZ 18
221 #define AUXENT union external_auxent
222 #define AUXESZ 18
223 #define DBXMASK 0x80 /* for dbx storage mask */
224 #define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
225
226
227
228 /********************** RELOCATION DIRECTIVES **********************/
229
230
231 struct external_reloc {
232 char r_vaddr[4];
233 char r_symndx[4];
234 char r_size[1];
235 char r_type[1];
236 };
237
238
239 #define RELOC struct external_reloc
240 #define RELSZ 10
241
242 #define DEFAULT_DATA_SECTION_ALIGNMENT 4
243 #define DEFAULT_BSS_SECTION_ALIGNMENT 4
244 #define DEFAULT_TEXT_SECTION_ALIGNMENT 4
245 /* For new sections we havn't heard of before */
246 #define DEFAULT_SECTION_ALIGNMENT 4
247