1 /* ECOFF support on MIPS machines.
2 coff/ecoff.h must be included before this file.
4 Copyright 1999, 2004 Free Software Foundation, Inc.
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 2 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, MA 02110-1301, USA. */
20 #define DO_NOT_DEFINE_AOUTHDR
22 #include "coff/external.h"
24 /* Magic numbers are defined in coff/ecoff.h. */
25 #define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
26 ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
27 ((x).f_magic!=MIPS_MAGIC_BIG) && \
28 ((x).f_magic!=MIPS_MAGIC_LITTLE2) && \
29 ((x).f_magic!=MIPS_MAGIC_BIG2) && \
30 ((x).f_magic!=MIPS_MAGIC_LITTLE3) && \
31 ((x).f_magic!=MIPS_MAGIC_BIG3))
34 /********************** AOUT "OPTIONAL HEADER" **********************/
36 typedef struct external_aouthdr
38 unsigned char magic
[2]; /* type of file */
39 unsigned char vstamp
[2]; /* version stamp */
40 unsigned char tsize
[4]; /* text size in bytes, padded to FW bdry*/
41 unsigned char dsize
[4]; /* initialized data " " */
42 unsigned char bsize
[4]; /* uninitialized data " " */
43 unsigned char entry
[4]; /* entry pt. */
44 unsigned char text_start
[4]; /* base of text used for this file */
45 unsigned char data_start
[4]; /* base of data used for this file */
46 unsigned char bss_start
[4]; /* base of bss used for this file */
47 unsigned char gprmask
[4]; /* ?? */
48 unsigned char cprmask
[4][4]; /* ?? */
49 unsigned char gp_value
[4]; /* value for gp register */
52 /* compute size of a header */
57 /********************** RELOCATION DIRECTIVES **********************/
61 unsigned char r_vaddr
[4];
62 unsigned char r_bits
[4];
65 #define RELOC struct external_reloc
68 /* MIPS ECOFF uses a packed 8 byte format for relocs. These constants
69 are used to unpack the r_bits field. */
71 #define RELOC_BITS0_SYMNDX_SH_LEFT_BIG 16
72 #define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE 0
74 #define RELOC_BITS1_SYMNDX_SH_LEFT_BIG 8
75 #define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE 8
77 #define RELOC_BITS2_SYMNDX_SH_LEFT_BIG 0
78 #define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE 16
80 /* Originally, ECOFF used four bits for the reloc type and had three
81 reserved bits. Irix 4 added another bit for the reloc type, which
82 was easy because it was big endian and one of the spare bits became
83 the new most significant bit. To make this also work for little
84 endian ECOFF, we need to wrap one of the reserved bits around to
85 become the most significant bit of the reloc type. */
86 #define RELOC_BITS3_TYPE_BIG 0x3E
87 #define RELOC_BITS3_TYPE_SH_BIG 1
88 #define RELOC_BITS3_TYPE_LITTLE 0x78
89 #define RELOC_BITS3_TYPE_SH_LITTLE 3
90 #define RELOC_BITS3_TYPEHI_LITTLE 0x04
91 #define RELOC_BITS3_TYPEHI_SH_LITTLE 2
93 #define RELOC_BITS3_EXTERN_BIG 0x01
94 #define RELOC_BITS3_EXTERN_LITTLE 0x80
96 /* The r_type field in a reloc is one of the following values. I
97 don't know if any other values can appear. These seem to be all
98 that occur in the Ultrix 4.2 libraries. */
99 #define MIPS_R_IGNORE 0
100 #define MIPS_R_REFHALF 1
101 #define MIPS_R_REFWORD 2
102 #define MIPS_R_JMPADDR 3
103 #define MIPS_R_REFHI 4
104 #define MIPS_R_REFLO 5
105 #define MIPS_R_GPREL 6
106 #define MIPS_R_LITERAL 7
108 /* FIXME: This relocation is used (internally only) to represent branches
109 when assembling. It should never appear in output files, and
110 be removed. (It used to be used for embedded-PIC support.) */
111 #define MIPS_R_PCREL16 12
113 /********************** STABS **********************/
115 #define MIPS_IS_STAB ECOFF_IS_STAB
116 #define MIPS_MARK_STAB ECOFF_MARK_STAB
117 #define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
119 /********************** SYMBOLIC INFORMATION **********************/
121 /* Written by John Gilmore. */
123 /* ECOFF uses COFF-like section structures, but its own symbol format.
124 This file defines the symbol format in fields whose size and alignment
125 will not vary on different host systems. */
127 /* File header as a set of bytes */
131 unsigned char h_magic
[2];
132 unsigned char h_vstamp
[2];
133 unsigned char h_ilineMax
[4];
134 unsigned char h_cbLine
[4];
135 unsigned char h_cbLineOffset
[4];
136 unsigned char h_idnMax
[4];
137 unsigned char h_cbDnOffset
[4];
138 unsigned char h_ipdMax
[4];
139 unsigned char h_cbPdOffset
[4];
140 unsigned char h_isymMax
[4];
141 unsigned char h_cbSymOffset
[4];
142 unsigned char h_ioptMax
[4];
143 unsigned char h_cbOptOffset
[4];
144 unsigned char h_iauxMax
[4];
145 unsigned char h_cbAuxOffset
[4];
146 unsigned char h_issMax
[4];
147 unsigned char h_cbSsOffset
[4];
148 unsigned char h_issExtMax
[4];
149 unsigned char h_cbSsExtOffset
[4];
150 unsigned char h_ifdMax
[4];
151 unsigned char h_cbFdOffset
[4];
152 unsigned char h_crfd
[4];
153 unsigned char h_cbRfdOffset
[4];
154 unsigned char h_iextMax
[4];
155 unsigned char h_cbExtOffset
[4];
158 /* File descriptor external record */
162 unsigned char f_adr
[4];
163 unsigned char f_rss
[4];
164 unsigned char f_issBase
[4];
165 unsigned char f_cbSs
[4];
166 unsigned char f_isymBase
[4];
167 unsigned char f_csym
[4];
168 unsigned char f_ilineBase
[4];
169 unsigned char f_cline
[4];
170 unsigned char f_ioptBase
[4];
171 unsigned char f_copt
[4];
172 unsigned char f_ipdFirst
[2];
173 unsigned char f_cpd
[2];
174 unsigned char f_iauxBase
[4];
175 unsigned char f_caux
[4];
176 unsigned char f_rfdBase
[4];
177 unsigned char f_crfd
[4];
178 unsigned char f_bits1
[1];
179 unsigned char f_bits2
[3];
180 unsigned char f_cbLineOffset
[4];
181 unsigned char f_cbLine
[4];
184 #define FDR_BITS1_LANG_BIG 0xF8
185 #define FDR_BITS1_LANG_SH_BIG 3
186 #define FDR_BITS1_LANG_LITTLE 0x1F
187 #define FDR_BITS1_LANG_SH_LITTLE 0
189 #define FDR_BITS1_FMERGE_BIG 0x04
190 #define FDR_BITS1_FMERGE_LITTLE 0x20
192 #define FDR_BITS1_FREADIN_BIG 0x02
193 #define FDR_BITS1_FREADIN_LITTLE 0x40
195 #define FDR_BITS1_FBIGENDIAN_BIG 0x01
196 #define FDR_BITS1_FBIGENDIAN_LITTLE 0x80
198 #define FDR_BITS2_GLEVEL_BIG 0xC0
199 #define FDR_BITS2_GLEVEL_SH_BIG 6
200 #define FDR_BITS2_GLEVEL_LITTLE 0x03
201 #define FDR_BITS2_GLEVEL_SH_LITTLE 0
203 /* We ignore the `reserved' field in bits2. */
205 /* Procedure descriptor external record */
209 unsigned char p_adr
[4];
210 unsigned char p_isym
[4];
211 unsigned char p_iline
[4];
212 unsigned char p_regmask
[4];
213 unsigned char p_regoffset
[4];
214 unsigned char p_iopt
[4];
215 unsigned char p_fregmask
[4];
216 unsigned char p_fregoffset
[4];
217 unsigned char p_frameoffset
[4];
218 unsigned char p_framereg
[2];
219 unsigned char p_pcreg
[2];
220 unsigned char p_lnLow
[4];
221 unsigned char p_lnHigh
[4];
222 unsigned char p_cbLineOffset
[4];
225 /* Runtime procedure table */
229 unsigned char p_adr
[4];
230 unsigned char p_regmask
[4];
231 unsigned char p_regoffset
[4];
232 unsigned char p_fregmask
[4];
233 unsigned char p_fregoffset
[4];
234 unsigned char p_frameoffset
[4];
235 unsigned char p_framereg
[2];
236 unsigned char p_pcreg
[2];
237 unsigned char p_irpss
[4];
238 unsigned char p_reserved
[4];
239 unsigned char p_exception_info
[4];
246 unsigned char l_line
[4];
249 /* Symbol external record */
253 unsigned char s_iss
[4];
254 unsigned char s_value
[4];
255 unsigned char s_bits1
[1];
256 unsigned char s_bits2
[1];
257 unsigned char s_bits3
[1];
258 unsigned char s_bits4
[1];
261 #define SYM_BITS1_ST_BIG 0xFC
262 #define SYM_BITS1_ST_SH_BIG 2
263 #define SYM_BITS1_ST_LITTLE 0x3F
264 #define SYM_BITS1_ST_SH_LITTLE 0
266 #define SYM_BITS1_SC_BIG 0x03
267 #define SYM_BITS1_SC_SH_LEFT_BIG 3
268 #define SYM_BITS1_SC_LITTLE 0xC0
269 #define SYM_BITS1_SC_SH_LITTLE 6
271 #define SYM_BITS2_SC_BIG 0xE0
272 #define SYM_BITS2_SC_SH_BIG 5
273 #define SYM_BITS2_SC_LITTLE 0x07
274 #define SYM_BITS2_SC_SH_LEFT_LITTLE 2
276 #define SYM_BITS2_RESERVED_BIG 0x10
277 #define SYM_BITS2_RESERVED_LITTLE 0x08
279 #define SYM_BITS2_INDEX_BIG 0x0F
280 #define SYM_BITS2_INDEX_SH_LEFT_BIG 16
281 #define SYM_BITS2_INDEX_LITTLE 0xF0
282 #define SYM_BITS2_INDEX_SH_LITTLE 4
284 #define SYM_BITS3_INDEX_SH_LEFT_BIG 8
285 #define SYM_BITS3_INDEX_SH_LEFT_LITTLE 4
287 #define SYM_BITS4_INDEX_SH_LEFT_BIG 0
288 #define SYM_BITS4_INDEX_SH_LEFT_LITTLE 12
290 /* External symbol external record */
294 unsigned char es_bits1
[1];
295 unsigned char es_bits2
[1];
296 unsigned char es_ifd
[2];
297 struct sym_ext es_asym
;
300 #define EXT_BITS1_JMPTBL_BIG 0x80
301 #define EXT_BITS1_JMPTBL_LITTLE 0x01
303 #define EXT_BITS1_COBOL_MAIN_BIG 0x40
304 #define EXT_BITS1_COBOL_MAIN_LITTLE 0x02
306 #define EXT_BITS1_WEAKEXT_BIG 0x20
307 #define EXT_BITS1_WEAKEXT_LITTLE 0x04
309 /* Dense numbers external record */
313 unsigned char d_rfd
[4];
314 unsigned char d_index
[4];
317 /* Relative file descriptor */
321 unsigned char rfd
[4];
324 /* Optimizer symbol external record */
328 unsigned char o_bits1
[1];
329 unsigned char o_bits2
[1];
330 unsigned char o_bits3
[1];
331 unsigned char o_bits4
[1];
332 struct rndx_ext o_rndx
;
333 unsigned char o_offset
[4];
336 #define OPT_BITS2_VALUE_SH_LEFT_BIG 16
337 #define OPT_BITS2_VALUE_SH_LEFT_LITTLE 0
339 #define OPT_BITS3_VALUE_SH_LEFT_BIG 8
340 #define OPT_BITS3_VALUE_SH_LEFT_LITTLE 8
342 #define OPT_BITS4_VALUE_SH_LEFT_BIG 0
343 #define OPT_BITS4_VALUE_SH_LEFT_LITTLE 16
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