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review.evervolv.com / android_kernel_htc_msm8960 / 31ae9bddb935c74b51ead08d54948e5bea0f0344 / . / arch / powerpc / boot / rs6000.h
blob: 433f45084e416a3f1e094ed8e58d7c50f6b883fa [file] [log] [blame]
Paul Mackerras66a45dd2006-01-14 15:04:06 +1100[diff] [blame]1/* IBM RS/6000 "XCOFF" file definitions for BFD.
2 Copyright (C) 1990, 1991 Free Software Foundation, Inc.
3 FIXME: Can someone provide a transliteration of this name into ASCII?
4 Using the following chars caused a compiler warning on HIUX (so I replaced
5 them with octal escapes), and isn't useful without an understanding of what
6 character set it is.
7 Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
8 and John Gilmore of Cygnus Support. */
9
10/********************** FILE HEADER **********************/
11
12struct external_filehdr {
13 char f_magic[2]; /* magic number */
14 char f_nscns[2]; /* number of sections */
15 char f_timdat[4]; /* time & date stamp */
16 char f_symptr[4]; /* file pointer to symtab */
17 char f_nsyms[4]; /* number of symtab entries */
18 char f_opthdr[2]; /* sizeof(optional hdr) */
19 char f_flags[2]; /* flags */
20};
21
22 /* IBM RS/6000 */
23#define U802WRMAGIC 0730 /* writeable text segments **chh** */
24#define U802ROMAGIC 0735 /* readonly sharable text segments */
25#define U802TOCMAGIC 0737 /* readonly text segments and TOC */
26
27#define BADMAG(x) \
28 ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
29 (x).f_magic != U802TOCMAGIC)
30
31#define FILHDR struct external_filehdr
32#define FILHSZ 20
33
34
35/********************** AOUT "OPTIONAL HEADER" **********************/
36
37
38typedef struct
39{
40 unsigned char magic[2]; /* type of file */
41 unsigned char vstamp[2]; /* version stamp */
42 unsigned char tsize[4]; /* text size in bytes, padded to FW bdry */
43 unsigned char dsize[4]; /* initialized data " " */
44 unsigned char bsize[4]; /* uninitialized data " " */
45 unsigned char entry[4]; /* entry pt. */
46 unsigned char text_start[4]; /* base of text used for this file */
47 unsigned char data_start[4]; /* base of data used for this file */
48 unsigned char o_toc[4]; /* address of TOC */
49 unsigned char o_snentry[2]; /* section number of entry point */
50 unsigned char o_sntext[2]; /* section number of .text section */
51 unsigned char o_sndata[2]; /* section number of .data section */
52 unsigned char o_sntoc[2]; /* section number of TOC */
53 unsigned char o_snloader[2]; /* section number of .loader section */
54 unsigned char o_snbss[2]; /* section number of .bss section */
55 unsigned char o_algntext[2]; /* .text alignment */
56 unsigned char o_algndata[2]; /* .data alignment */
57 unsigned char o_modtype[2]; /* module type (??) */
58 unsigned char o_cputype[2]; /* cpu type */
59 unsigned char o_maxstack[4]; /* max stack size (??) */
60 unsigned char o_maxdata[4]; /* max data size (??) */
61 unsigned char o_resv2[12]; /* reserved */
62}
63AOUTHDR;
64
65#define AOUTSZ 72
66#define SMALL_AOUTSZ (28)
67#define AOUTHDRSZ 72
68
69#define RS6K_AOUTHDR_OMAGIC 0x0107 /* old: text & data writeable */
70#define RS6K_AOUTHDR_NMAGIC 0x0108 /* new: text r/o, data r/w */
71#define RS6K_AOUTHDR_ZMAGIC 0x010B /* paged: text r/o, both page-aligned */
72
73
74/********************** SECTION HEADER **********************/
75
76
77struct external_scnhdr {
78 char s_name[8]; /* section name */
79 char s_paddr[4]; /* physical address, aliased s_nlib */
80 char s_vaddr[4]; /* virtual address */
81 char s_size[4]; /* section size */
82 char s_scnptr[4]; /* file ptr to raw data for section */
83 char s_relptr[4]; /* file ptr to relocation */
84 char s_lnnoptr[4]; /* file ptr to line numbers */
85 char s_nreloc[2]; /* number of relocation entries */
86 char s_nlnno[2]; /* number of line number entries*/
87 char s_flags[4]; /* flags */
88};
89
90/*
91 * names of "special" sections
92 */
93#define _TEXT ".text"
94#define _DATA ".data"
95#define _BSS ".bss"
96#define _PAD ".pad"
97#define _LOADER ".loader"
98
99#define SCNHDR struct external_scnhdr
100#define SCNHSZ 40
101
102/* XCOFF uses a special .loader section with type STYP_LOADER. */
103#define STYP_LOADER 0x1000
104
105/* XCOFF uses a special .debug section with type STYP_DEBUG. */
106#define STYP_DEBUG 0x2000
107
108/* XCOFF handles line number or relocation overflow by creating
109 another section header with STYP_OVRFLO set. */
110#define STYP_OVRFLO 0x8000
111
112/********************** LINE NUMBERS **********************/
113
114/* 1 line number entry for every "breakpointable" source line in a section.
115 * Line numbers are grouped on a per function basis; first entry in a function
116 * grouping will have l_lnno = 0 and in place of physical address will be the
117 * symbol table index of the function name.
118 */
119struct external_lineno {
120 union {
121 char l_symndx[4]; /* function name symbol index, iff l_lnno == 0*/
122 char l_paddr[4]; /* (physical) address of line number */
123 } l_addr;
124 char l_lnno[2]; /* line number */
125};
126
127
128#define LINENO struct external_lineno
129#define LINESZ 6
130
131
132/********************** SYMBOLS **********************/
133
134#define E_SYMNMLEN 8 /* # characters in a symbol name */
135#define E_FILNMLEN 14 /* # characters in a file name */
136#define E_DIMNUM 4 /* # array dimensions in auxiliary entry */
137
138struct external_syment
139{
140 union {
141 char e_name[E_SYMNMLEN];
142 struct {
143 char e_zeroes[4];
144 char e_offset[4];
145 } e;
146 } e;
147 char e_value[4];
148 char e_scnum[2];
149 char e_type[2];
150 char e_sclass[1];
151 char e_numaux[1];
152};
153
154
155
156#define N_BTMASK (017)
157#define N_TMASK (060)
158#define N_BTSHFT (4)
159#define N_TSHIFT (2)
160
161
162union external_auxent {
163 struct {
164 char x_tagndx[4]; /* str, un, or enum tag indx */
165 union {
166 struct {
167 char x_lnno[2]; /* declaration line number */
168 char x_size[2]; /* str/union/array size */
169 } x_lnsz;
170 char x_fsize[4]; /* size of function */
171 } x_misc;
172 union {
173 struct { /* if ISFCN, tag, or .bb */
174 char x_lnnoptr[4]; /* ptr to fcn line # */
175 char x_endndx[4]; /* entry ndx past block end */
176 } x_fcn;
177 struct { /* if ISARY, up to 4 dimen. */
178 char x_dimen[E_DIMNUM][2];
179 } x_ary;
180 } x_fcnary;
181 char x_tvndx[2]; /* tv index */
182 } x_sym;
183
184 union {
185 char x_fname[E_FILNMLEN];
186 struct {
187 char x_zeroes[4];
188 char x_offset[4];
189 } x_n;
190 } x_file;
191
192 struct {
193 char x_scnlen[4]; /* section length */
194 char x_nreloc[2]; /* # relocation entries */
195 char x_nlinno[2]; /* # line numbers */
196 } x_scn;
197
198 struct {
199 char x_tvfill[4]; /* tv fill value */
200 char x_tvlen[2]; /* length of .tv */
201 char x_tvran[2][2]; /* tv range */
202 } x_tv; /* info about .tv section (in auxent of symbol .tv)) */
203
204 struct {
205 unsigned char x_scnlen[4];
206 unsigned char x_parmhash[4];
207 unsigned char x_snhash[2];
208 unsigned char x_smtyp[1];
209 unsigned char x_smclas[1];
210 unsigned char x_stab[4];
211 unsigned char x_snstab[2];
212 } x_csect;
213
214};
215
216#define SYMENT struct external_syment
217#define SYMESZ 18
218#define AUXENT union external_auxent
219#define AUXESZ 18
220#define DBXMASK 0x80 /* for dbx storage mask */
221#define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
222
223
224
225/********************** RELOCATION DIRECTIVES **********************/
226
227
228struct external_reloc {
229 char r_vaddr[4];
230 char r_symndx[4];
231 char r_size[1];
232 char r_type[1];
233};
234
235
236#define RELOC struct external_reloc
237#define RELSZ 10
238
239#define DEFAULT_DATA_SECTION_ALIGNMENT 4
240#define DEFAULT_BSS_SECTION_ALIGNMENT 4
241#define DEFAULT_TEXT_SECTION_ALIGNMENT 4
242/* For new sections we havn't heard of before */
243#define DEFAULT_SECTION_ALIGNMENT 4