source: trunk/libs/newlib/src/include/coff/mips.h @ 666

Last change on this file since 666 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
File size: 9.3 KB
Line 
1/* ECOFF support on MIPS machines.
2   coff/ecoff.h must be included before this file.
3   
4   Copyright 1999, 2004, 2010 Free Software Foundation, Inc.
5
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 3 of the License, or
9   (at your option) any later version.
10   
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.
15   
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,
19   MA 02110-1301, USA.  */
20
21#define DO_NOT_DEFINE_AOUTHDR
22#define L_LNNO_SIZE 4
23#include "coff/external.h"
24
25/* Magic numbers are defined in coff/ecoff.h.  */
26#define MIPS_ECOFF_BADMAG(x) (((x).f_magic!=MIPS_MAGIC_1) && \
27                              ((x).f_magic!=MIPS_MAGIC_LITTLE) &&\
28                              ((x).f_magic!=MIPS_MAGIC_BIG) && \
29                              ((x).f_magic!=MIPS_MAGIC_LITTLE2) && \
30                              ((x).f_magic!=MIPS_MAGIC_BIG2) && \
31                              ((x).f_magic!=MIPS_MAGIC_LITTLE3) && \
32                              ((x).f_magic!=MIPS_MAGIC_BIG3))
33
34
35/********************** AOUT "OPTIONAL HEADER" **********************/
36
37typedef struct external_aouthdr
38{
39  unsigned char magic[2];       /* type of file                         */
40  unsigned char vstamp[2];      /* version stamp                        */
41  unsigned char tsize[4];       /* text size in bytes, padded to FW bdry*/
42  unsigned char dsize[4];       /* initialized data "  "                */
43  unsigned char bsize[4];       /* uninitialized data "   "             */
44  unsigned char entry[4];       /* entry pt.                            */
45  unsigned char text_start[4];  /* base of text used for this file */
46  unsigned char data_start[4];  /* base of data used for this file */
47  unsigned char bss_start[4];   /* base of bss used for this file */
48  unsigned char gprmask[4];     /* ?? */
49  unsigned char cprmask[4][4];  /* ?? */
50  unsigned char gp_value[4];    /* value for gp register */
51} AOUTHDR;
52
53/* compute size of a header */
54
55#define AOUTSZ 56
56#define AOUTHDRSZ 56
57
58/********************** RELOCATION DIRECTIVES **********************/
59
60struct external_reloc
61  {
62    unsigned char r_vaddr[4];
63    unsigned char r_bits[4];
64  };
65
66#define RELOC struct external_reloc
67#define RELSZ 8
68
69/* MIPS ECOFF uses a packed 8 byte format for relocs.  These constants
70   are used to unpack the r_bits field.  */
71
72#define RELOC_BITS0_SYMNDX_SH_LEFT_BIG          16
73#define RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE       0
74
75#define RELOC_BITS1_SYMNDX_SH_LEFT_BIG          8
76#define RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE       8
77
78#define RELOC_BITS2_SYMNDX_SH_LEFT_BIG          0
79#define RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE       16
80
81/* Originally, ECOFF used four bits for the reloc type and had three
82   reserved bits.  Irix 4 added another bit for the reloc type, which
83   was easy because it was big endian and one of the spare bits became
84   the new most significant bit.  To make this also work for little
85   endian ECOFF, we need to wrap one of the reserved bits around to
86   become the most significant bit of the reloc type.  */
87#define RELOC_BITS3_TYPE_BIG                    0x3E
88#define RELOC_BITS3_TYPE_SH_BIG                 1
89#define RELOC_BITS3_TYPE_LITTLE                 0x78
90#define RELOC_BITS3_TYPE_SH_LITTLE              3
91#define RELOC_BITS3_TYPEHI_LITTLE               0x04
92#define RELOC_BITS3_TYPEHI_SH_LITTLE            2
93
94#define RELOC_BITS3_EXTERN_BIG                  0x01
95#define RELOC_BITS3_EXTERN_LITTLE               0x80
96
97/* The r_type field in a reloc is one of the following values.  I
98   don't know if any other values can appear.  These seem to be all
99   that occur in the Ultrix 4.2 libraries.  */
100#define MIPS_R_IGNORE   0
101#define MIPS_R_REFHALF  1
102#define MIPS_R_REFWORD  2
103#define MIPS_R_JMPADDR  3
104#define MIPS_R_REFHI    4
105#define MIPS_R_REFLO    5
106#define MIPS_R_GPREL    6
107#define MIPS_R_LITERAL  7
108
109/* FIXME: This relocation is used (internally only) to represent branches
110   when assembling.  It should never appear in output files, and 
111   be removed.  (It used to be used for embedded-PIC support.)  */
112#define MIPS_R_PCREL16  12
113
114/********************** STABS **********************/
115
116#define MIPS_IS_STAB ECOFF_IS_STAB
117#define MIPS_MARK_STAB ECOFF_MARK_STAB
118#define MIPS_UNMARK_STAB ECOFF_UNMARK_STAB
119
120/********************** SYMBOLIC INFORMATION **********************/
121
122/* Written by John Gilmore.  */
123
124/* ECOFF uses COFF-like section structures, but its own symbol format.
125   This file defines the symbol format in fields whose size and alignment
126   will not vary on different host systems.  */
127
128/* File header as a set of bytes */
129
130struct hdr_ext
131{
132        unsigned char   h_magic[2];
133        unsigned char   h_vstamp[2];
134        unsigned char   h_ilineMax[4];
135        unsigned char   h_cbLine[4];
136        unsigned char   h_cbLineOffset[4];
137        unsigned char   h_idnMax[4];
138        unsigned char   h_cbDnOffset[4];
139        unsigned char   h_ipdMax[4];
140        unsigned char   h_cbPdOffset[4];
141        unsigned char   h_isymMax[4];
142        unsigned char   h_cbSymOffset[4];
143        unsigned char   h_ioptMax[4];
144        unsigned char   h_cbOptOffset[4];
145        unsigned char   h_iauxMax[4];
146        unsigned char   h_cbAuxOffset[4];
147        unsigned char   h_issMax[4];
148        unsigned char   h_cbSsOffset[4];
149        unsigned char   h_issExtMax[4];
150        unsigned char   h_cbSsExtOffset[4];
151        unsigned char   h_ifdMax[4];
152        unsigned char   h_cbFdOffset[4];
153        unsigned char   h_crfd[4];
154        unsigned char   h_cbRfdOffset[4];
155        unsigned char   h_iextMax[4];
156        unsigned char   h_cbExtOffset[4];
157};
158
159/* File descriptor external record */
160
161struct fdr_ext
162{
163        unsigned char   f_adr[4];
164        unsigned char   f_rss[4];
165        unsigned char   f_issBase[4];
166        unsigned char   f_cbSs[4];
167        unsigned char   f_isymBase[4];
168        unsigned char   f_csym[4];
169        unsigned char   f_ilineBase[4];
170        unsigned char   f_cline[4];
171        unsigned char   f_ioptBase[4];
172        unsigned char   f_copt[4];
173        unsigned char   f_ipdFirst[2];
174        unsigned char   f_cpd[2];
175        unsigned char   f_iauxBase[4];
176        unsigned char   f_caux[4];
177        unsigned char   f_rfdBase[4];
178        unsigned char   f_crfd[4];
179        unsigned char   f_bits1[1];
180        unsigned char   f_bits2[3];
181        unsigned char   f_cbLineOffset[4];
182        unsigned char   f_cbLine[4];
183};
184
185#define FDR_BITS1_LANG_BIG              0xF8
186#define FDR_BITS1_LANG_SH_BIG           3
187#define FDR_BITS1_LANG_LITTLE           0x1F
188#define FDR_BITS1_LANG_SH_LITTLE        0
189
190#define FDR_BITS1_FMERGE_BIG            0x04
191#define FDR_BITS1_FMERGE_LITTLE         0x20
192
193#define FDR_BITS1_FREADIN_BIG           0x02
194#define FDR_BITS1_FREADIN_LITTLE        0x40
195
196#define FDR_BITS1_FBIGENDIAN_BIG        0x01
197#define FDR_BITS1_FBIGENDIAN_LITTLE     0x80
198
199#define FDR_BITS2_GLEVEL_BIG            0xC0
200#define FDR_BITS2_GLEVEL_SH_BIG         6
201#define FDR_BITS2_GLEVEL_LITTLE         0x03
202#define FDR_BITS2_GLEVEL_SH_LITTLE      0
203
204/* We ignore the `reserved' field in bits2. */
205
206/* Procedure descriptor external record */
207
208struct pdr_ext
209{
210        unsigned char   p_adr[4];
211        unsigned char   p_isym[4];
212        unsigned char   p_iline[4];
213        unsigned char   p_regmask[4];
214        unsigned char   p_regoffset[4];
215        unsigned char   p_iopt[4];
216        unsigned char   p_fregmask[4];
217        unsigned char   p_fregoffset[4];
218        unsigned char   p_frameoffset[4];
219        unsigned char   p_framereg[2];
220        unsigned char   p_pcreg[2];
221        unsigned char   p_lnLow[4];
222        unsigned char   p_lnHigh[4];
223        unsigned char   p_cbLineOffset[4];
224};
225
226/* Runtime procedure table */
227
228struct rpdr_ext
229{
230        unsigned char   p_adr[4];
231        unsigned char   p_regmask[4];
232        unsigned char   p_regoffset[4];
233        unsigned char   p_fregmask[4];
234        unsigned char   p_fregoffset[4];
235        unsigned char   p_frameoffset[4];
236        unsigned char   p_framereg[2];
237        unsigned char   p_pcreg[2];
238        unsigned char   p_irpss[4];
239        unsigned char   p_reserved[4];
240        unsigned char   p_exception_info[4];
241};
242
243/* Line numbers */
244
245struct line_ext
246{
247        unsigned char   l_line[4];
248};
249
250/* Symbol external record */
251
252struct sym_ext
253{
254        unsigned char   s_iss[4];
255        unsigned char   s_value[4];
256        unsigned char   s_bits1[1];
257        unsigned char   s_bits2[1];
258        unsigned char   s_bits3[1];
259        unsigned char   s_bits4[1];
260};
261
262#define SYM_BITS1_ST_BIG                0xFC
263#define SYM_BITS1_ST_SH_BIG             2
264#define SYM_BITS1_ST_LITTLE             0x3F
265#define SYM_BITS1_ST_SH_LITTLE          0
266
267#define SYM_BITS1_SC_BIG                0x03
268#define SYM_BITS1_SC_SH_LEFT_BIG        3
269#define SYM_BITS1_SC_LITTLE             0xC0
270#define SYM_BITS1_SC_SH_LITTLE          6
271
272#define SYM_BITS2_SC_BIG                0xE0
273#define SYM_BITS2_SC_SH_BIG             5
274#define SYM_BITS2_SC_LITTLE             0x07
275#define SYM_BITS2_SC_SH_LEFT_LITTLE     2
276
277#define SYM_BITS2_RESERVED_BIG          0x10
278#define SYM_BITS2_RESERVED_LITTLE       0x08
279
280#define SYM_BITS2_INDEX_BIG             0x0F
281#define SYM_BITS2_INDEX_SH_LEFT_BIG     16
282#define SYM_BITS2_INDEX_LITTLE          0xF0
283#define SYM_BITS2_INDEX_SH_LITTLE       4
284
285#define SYM_BITS3_INDEX_SH_LEFT_BIG     8
286#define SYM_BITS3_INDEX_SH_LEFT_LITTLE  4
287
288#define SYM_BITS4_INDEX_SH_LEFT_BIG     0
289#define SYM_BITS4_INDEX_SH_LEFT_LITTLE  12
290
291/* External symbol external record */
292
293struct ext_ext
294{
295        unsigned char   es_bits1[1];
296        unsigned char   es_bits2[1];
297        unsigned char   es_ifd[2];
298        struct  sym_ext es_asym;
299};
300
301#define EXT_BITS1_JMPTBL_BIG            0x80
302#define EXT_BITS1_JMPTBL_LITTLE         0x01
303
304#define EXT_BITS1_COBOL_MAIN_BIG        0x40
305#define EXT_BITS1_COBOL_MAIN_LITTLE     0x02
306
307#define EXT_BITS1_WEAKEXT_BIG           0x20
308#define EXT_BITS1_WEAKEXT_LITTLE        0x04
309
310/* Dense numbers external record */
311
312struct dnr_ext
313{
314        unsigned char   d_rfd[4];
315        unsigned char   d_index[4];
316};
317
318/* Relative file descriptor */
319
320struct rfd_ext
321{
322  unsigned char rfd[4];
323};
324
325/* Optimizer symbol external record */
326
327struct opt_ext
328{
329  unsigned char o_bits1[1];
330  unsigned char o_bits2[1];
331  unsigned char o_bits3[1];
332  unsigned char o_bits4[1];
333  struct rndx_ext o_rndx;
334  unsigned char o_offset[4];
335};
336
337#define OPT_BITS2_VALUE_SH_LEFT_BIG     16
338#define OPT_BITS2_VALUE_SH_LEFT_LITTLE  0
339
340#define OPT_BITS3_VALUE_SH_LEFT_BIG     8
341#define OPT_BITS3_VALUE_SH_LEFT_LITTLE  8
342
343#define OPT_BITS4_VALUE_SH_LEFT_BIG     0
344#define OPT_BITS4_VALUE_SH_LEFT_LITTLE  16
Note: See TracBrowser for help on using the repository browser.