source: trunk/libs/newlib/src/include/coff/ecoff.h @ 542

Last change on this file since 542 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
File size: 14.2 KB
RevLine 
[444]1/* Generic ECOFF support.
2   This does not include symbol information, found in sym.h and
3   symconst.h.
4
5   Copyright 2001, 2002, 2003, 2004, 2005, 2010 Free Software Foundation, Inc.
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20   MA 02110-1301, USA.  */
21
22#ifndef ECOFF_H
23#define ECOFF_H
24
25/* Mips magic numbers used in filehdr.  MIPS_MAGIC_LITTLE is used on
26   little endian machines.  MIPS_MAGIC_BIG is used on big endian
27   machines.  Where is MIPS_MAGIC_1 from?  */
28#define MIPS_MAGIC_1 0x0180
29#define MIPS_MAGIC_LITTLE 0x0162
30#define MIPS_MAGIC_BIG 0x0160
31
32/* These are the magic numbers used for MIPS code compiled at ISA
33   level 2.  */
34#define MIPS_MAGIC_LITTLE2 0x0166
35#define MIPS_MAGIC_BIG2 0x0163
36
37/* These are the magic numbers used for MIPS code compiled at ISA
38   level 3.  */
39#define MIPS_MAGIC_LITTLE3 0x142
40#define MIPS_MAGIC_BIG3 0x140
41
42/* Alpha magic numbers used in filehdr.  */
43#define ALPHA_MAGIC 0x183
44#define ALPHA_MAGIC_BSD 0x185
45/* A compressed version of an ALPHA_MAGIC file created by DEC's tools.  */
46#define ALPHA_MAGIC_COMPRESSED 0x188
47
48/* Magic numbers used in a.out header.  */
49#define ECOFF_AOUT_OMAGIC 0407  /* not demand paged (ld -N).  */
50#define ECOFF_AOUT_ZMAGIC 0413  /* demand load format, eg normal ld output */
51
52/* Names of special sections.  */
53#define _TEXT   ".text"
54#define _DATA   ".data"
55#define _BSS    ".bss"
56#define _RDATA  ".rdata"
57#define _SDATA  ".sdata"
58#define _SBSS   ".sbss"
59#define _LITA   ".lita"
60#define _LIT4   ".lit4"
61#define _LIT8   ".lit8"
62#define _LIB    ".lib"
63#define _INIT   ".init"
64#define _FINI   ".fini"
65#define _PDATA  ".pdata"
66#define _XDATA  ".xdata"
67#define _GOT    ".got"
68#define _HASH   ".hash"
69#define _DYNSYM ".dynsym"
70#define _DYNSTR ".dynstr"
71#define _RELDYN ".rel.dyn"
72#define _CONFLIC ".conflic"
73#define _COMMENT ".comment"
74#define _LIBLIST ".liblist"
75#define _DYNAMIC ".dynamic"
76#define _RCONST ".rconst"
77
78/* ECOFF uses some additional section flags.  */
79#define STYP_RDATA           0x100
80#define STYP_SDATA           0x200
81#define STYP_SBSS            0x400
82#define STYP_GOT            0x1000
83#define STYP_DYNAMIC        0x2000
84#define STYP_DYNSYM         0x4000
85#define STYP_RELDYN         0x8000
86#define STYP_DYNSTR        0x10000
87#define STYP_HASH          0x20000
88#define STYP_LIBLIST       0x40000
89#define STYP_CONFLIC      0x100000
90#define STYP_ECOFF_FINI  0x1000000
91#define STYP_EXTENDESC   0x2000000 /* 0x02FFF000 bits => scn type, rest clr */
92#define STYP_LITA        0x4000000
93#define STYP_LIT8        0x8000000
94#define STYP_LIT4       0x10000000
95#define STYP_ECOFF_LIB  0x40000000
96#define STYP_ECOFF_INIT 0x80000000
97#define STYP_OTHER_LOAD (STYP_ECOFF_INIT | STYP_ECOFF_FINI)
98
99/* extended section types */
100#define STYP_COMMENT     0x2100000
101#define STYP_RCONST      0x2200000
102#define STYP_XDATA       0x2400000
103#define STYP_PDATA       0x2800000
104
105/* The linker needs a section to hold small common variables while
106   linking.  There is no convenient way to create it when the linker
107   needs it, so we always create one for each BFD.  We then avoid
108   writing it out.  */
109#define SCOMMON ".scommon"
110
111/* If the extern bit in a reloc is 1, then r_symndx is an index into
112   the external symbol table.  If the extern bit is 0, then r_symndx
113   indicates a section, and is one of the following values.  */
114#define RELOC_SECTION_NONE      0
115#define RELOC_SECTION_TEXT      1
116#define RELOC_SECTION_RDATA     2
117#define RELOC_SECTION_DATA      3
118#define RELOC_SECTION_SDATA     4
119#define RELOC_SECTION_SBSS      5
120#define RELOC_SECTION_BSS       6
121#define RELOC_SECTION_INIT      7
122#define RELOC_SECTION_LIT8      8
123#define RELOC_SECTION_LIT4      9
124#define RELOC_SECTION_XDATA    10
125#define RELOC_SECTION_PDATA    11
126#define RELOC_SECTION_FINI     12
127#define RELOC_SECTION_LITA     13
128#define RELOC_SECTION_ABS      14
129#define RELOC_SECTION_RCONST   15
130
131#define NUM_RELOC_SECTIONS     16
132
133/********************** STABS **********************/
134
135/* gcc uses mips-tfile to output type information in special stabs
136   entries.  These must match the corresponding definition in
137   gcc/config/mips.h.  At some point, these should probably go into a
138   shared include file, but currently gcc and gdb do not share any
139   directories. */
140#define CODE_MASK 0x8F300
141#define ECOFF_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
142#define ECOFF_MARK_STAB(code) ((code)+CODE_MASK)
143#define ECOFF_UNMARK_STAB(code) ((code)-CODE_MASK)
144#define STABS_SYMBOL "@stabs"
145
146/********************** COFF **********************/
147
148/* gcc also uses mips-tfile to output COFF debugging information.
149   These are the values it uses when outputting the .type directive.
150   These should also be in a shared include file.  */
151#define N_BTMASK        (017)
152#define N_TMASK         (060)
153#define N_BTSHFT        (4)
154#define N_TSHIFT        (2)
155
156/********************** AUX **********************/
157
158/* The auxiliary type information is the same on all known ECOFF
159   targets.  I can't see any reason that it would ever change, so I am
160   going to gamble and define the external structures here, in the
161   target independent ECOFF header file.  The internal forms are
162   defined in coff/sym.h, which was originally donated by MIPS
163   Computer Systems.  */
164
165/* Type information external record */
166
167struct tir_ext {
168        unsigned char   t_bits1[1];
169        unsigned char   t_tq45[1];
170        unsigned char   t_tq01[1];
171        unsigned char   t_tq23[1];
172};
173
174#define TIR_BITS1_FBITFIELD_BIG         ((unsigned int) 0x80)
175#define TIR_BITS1_FBITFIELD_LITTLE      ((unsigned int) 0x01)
176
177#define TIR_BITS1_CONTINUED_BIG         ((unsigned int) 0x40)
178#define TIR_BITS1_CONTINUED_LITTLE      ((unsigned int) 0x02)
179
180#define TIR_BITS1_BT_BIG                ((unsigned int) 0x3F)
181#define TIR_BITS1_BT_SH_BIG             0
182#define TIR_BITS1_BT_LITTLE             ((unsigned int) 0xFC)
183#define TIR_BITS1_BT_SH_LITTLE          2
184
185#define TIR_BITS_TQ4_BIG                ((unsigned int) 0xF0)
186#define TIR_BITS_TQ4_SH_BIG             4
187#define TIR_BITS_TQ5_BIG                ((unsigned int) 0x0F)
188#define TIR_BITS_TQ5_SH_BIG             0
189#define TIR_BITS_TQ4_LITTLE             ((unsigned int) 0x0F)
190#define TIR_BITS_TQ4_SH_LITTLE          0
191#define TIR_BITS_TQ5_LITTLE             ((unsigned int) 0xF0)
192#define TIR_BITS_TQ5_SH_LITTLE          4
193
194#define TIR_BITS_TQ0_BIG                ((unsigned int) 0xF0)
195#define TIR_BITS_TQ0_SH_BIG             4
196#define TIR_BITS_TQ1_BIG                ((unsigned int) 0x0F)
197#define TIR_BITS_TQ1_SH_BIG             0
198#define TIR_BITS_TQ0_LITTLE             ((unsigned int) 0x0F)
199#define TIR_BITS_TQ0_SH_LITTLE          0
200#define TIR_BITS_TQ1_LITTLE             ((unsigned int) 0xF0)
201#define TIR_BITS_TQ1_SH_LITTLE          4
202
203#define TIR_BITS_TQ2_BIG                ((unsigned int) 0xF0)
204#define TIR_BITS_TQ2_SH_BIG             4
205#define TIR_BITS_TQ3_BIG                ((unsigned int) 0x0F)
206#define TIR_BITS_TQ3_SH_BIG             0
207#define TIR_BITS_TQ2_LITTLE             ((unsigned int) 0x0F)
208#define TIR_BITS_TQ2_SH_LITTLE          0
209#define TIR_BITS_TQ3_LITTLE             ((unsigned int) 0xF0)
210#define TIR_BITS_TQ3_SH_LITTLE          4
211
212/* Relative symbol external record */
213
214struct rndx_ext {
215        unsigned char   r_bits[4];
216};
217
218#define RNDX_BITS0_RFD_SH_LEFT_BIG      4
219#define RNDX_BITS1_RFD_BIG              ((unsigned int) 0xF0)
220#define RNDX_BITS1_RFD_SH_BIG           4
221
222#define RNDX_BITS0_RFD_SH_LEFT_LITTLE   0
223#define RNDX_BITS1_RFD_LITTLE           ((unsigned int) 0x0F)
224#define RNDX_BITS1_RFD_SH_LEFT_LITTLE   8
225
226#define RNDX_BITS1_INDEX_BIG            ((unsigned int) 0x0F)
227#define RNDX_BITS1_INDEX_SH_LEFT_BIG    16
228#define RNDX_BITS2_INDEX_SH_LEFT_BIG    8
229#define RNDX_BITS3_INDEX_SH_LEFT_BIG    0
230
231#define RNDX_BITS1_INDEX_LITTLE         ((unsigned int) 0xF0)
232#define RNDX_BITS1_INDEX_SH_LITTLE      4
233#define RNDX_BITS2_INDEX_SH_LEFT_LITTLE 4
234#define RNDX_BITS3_INDEX_SH_LEFT_LITTLE 12
235
236/* Auxiliary symbol information external record */
237
238union aux_ext {
239        struct tir_ext  a_ti;
240        struct rndx_ext a_rndx;
241        unsigned char   a_dnLow[4];
242        unsigned char   a_dnHigh[4];
243        unsigned char   a_isym[4];
244        unsigned char   a_iss[4];
245        unsigned char   a_width[4];
246        unsigned char   a_count[4];
247};
248
249#define AUX_GET_ANY(bigend, ax, field) \
250  ((bigend) ? bfd_getb32 ((ax)->field) : bfd_getl32 ((ax)->field))
251
252#define AUX_GET_DNLOW(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_dnLow)
253#define AUX_GET_DNHIGH(bigend, ax)      AUX_GET_ANY ((bigend), (ax), a_dnHigh)
254#define AUX_GET_ISYM(bigend, ax)        AUX_GET_ANY ((bigend), (ax), a_isym)
255#define AUX_GET_ISS(bigend, ax)         AUX_GET_ANY ((bigend), (ax), a_iss)
256#define AUX_GET_WIDTH(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_width)
257#define AUX_GET_COUNT(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_count)
258
259#define AUX_PUT_ANY(bigend, val, ax, field) \
260  ((bigend) \
261   ? (bfd_putb32 ((bfd_vma) (val), (ax)->field), 0) \
262   : (bfd_putl32 ((bfd_vma) (val), (ax)->field), 0))
263
264#define AUX_PUT_DNLOW(bigend, val, ax) \
265  AUX_PUT_ANY ((bigend), (val), (ax), a_dnLow)
266#define AUX_PUT_DNHIGH(bigend, val, ax) \
267  AUX_PUT_ANY ((bigend), (val), (ax), a_dnHigh)
268#define AUX_PUT_ISYM(bigend, val, ax) \
269  AUX_PUT_ANY ((bigend), (val), (ax), a_isym)
270#define AUX_PUT_ISS(bigend, val, ax) \
271  AUX_PUT_ANY ((bigend), (val), (ax), a_iss)
272#define AUX_PUT_WIDTH(bigend, val, ax) \
273  AUX_PUT_ANY ((bigend), (val), (ax), a_width)
274#define AUX_PUT_COUNT(bigend, val, ax) \
275  AUX_PUT_ANY ((bigend), (val), (ax), a_count)
276
277/********************** SYMBOLS **********************/
278
279/* For efficiency, gdb deals directly with the unswapped symbolic
280   information (that way it only takes the time to swap information
281   that it really needs to read).  gdb originally retrieved the
282   information directly from the BFD backend information, but that
283   strategy, besides being sort of ugly, does not work for MIPS ELF,
284   which also uses ECOFF debugging information.  This structure holds
285   pointers to the (mostly) unswapped symbolic information.  */
286
287struct ecoff_debug_info
288{
289  /* The swapped ECOFF symbolic header.  */
290  HDRR symbolic_header;
291
292  /* Pointers to the unswapped symbolic information.  Note that the
293     pointers to external structures point to different sorts of
294     information on different ECOFF targets.  The ecoff_debug_swap
295     structure provides the sizes of the structures and the functions
296     needed to swap the information in and out.  These pointers are
297     all pointers to arrays, not single structures.  They will be NULL
298     if there are no instances of the relevant structure.  These
299     fields are also used by the assembler to output ECOFF debugging
300     information.  */
301  unsigned char *line;
302  void *external_dnr;   /* struct dnr_ext */
303  void *external_pdr;   /* struct pdr_ext */
304  void *external_sym;   /* struct sym_ext */
305  void *external_opt;   /* struct opt_ext */
306  union aux_ext *external_aux;
307  char *ss;
308  char *ssext;
309  void *external_fdr;   /* struct fdr_ext */
310  void *external_rfd;   /* struct rfd_ext */
311  void *external_ext;   /* struct ext_ext */
312
313  /* These fields are used when linking.  They may disappear at some
314     point.  */
315  char *ssext_end;
316  void *external_ext_end;
317
318  /* When linking, this field holds a mapping from the input FDR
319     numbers to the output numbers, and is used when writing out the
320     external symbols.  It is NULL if no mapping is required.  */
321  RFDT *ifdmap;
322
323  /* The swapped FDR information.  Currently this is never NULL, but
324     code using this structure should probably double-check in case
325     this changes in the future.  This is a pointer to an array, not a
326     single structure.  */
327  FDR *fdr;
328};
329
330/* These structures are used by the ECOFF find_nearest_line function.  */
331
332struct ecoff_fdrtab_entry
333{
334  /* Base address in .text of this FDR.  */
335  bfd_vma base_addr;
336  FDR *fdr;
337};
338
339struct ecoff_find_line
340{
341  /* Allocated memory to hold function and file names.  */
342  char *find_buffer;
343
344  /* FDR table, sorted by address: */
345  long fdrtab_len;
346  struct ecoff_fdrtab_entry *fdrtab;
347
348  /* Cache entry for most recently found line information.  The sect
349     field is NULL if this cache does not contain valid information.  */
350  struct
351    {
352      asection *sect;
353      bfd_vma start;
354      bfd_vma stop;
355      const char *filename;
356      const char *functionname;
357      unsigned int line_num;
358    } cache;
359};
360
361/********************** SWAPPING **********************/
362
363/* The generic ECOFF code needs to be able to swap debugging
364   information in and out in the specific format used by a particular
365   ECOFF implementation.  This structure provides the information
366   needed to do this.  */
367
368struct ecoff_debug_swap
369{
370  /* Symbol table magic number.  */
371  int sym_magic;
372  /* Alignment of debugging information.  E.g., 4.  */
373  bfd_size_type debug_align;
374  /* Sizes of external symbolic information.  */
375  bfd_size_type external_hdr_size;
376  bfd_size_type external_dnr_size;
377  bfd_size_type external_pdr_size;
378  bfd_size_type external_sym_size;
379  bfd_size_type external_opt_size;
380  bfd_size_type external_fdr_size;
381  bfd_size_type external_rfd_size;
382  bfd_size_type external_ext_size;
383  /* Functions to swap in external symbolic data.  */
384  void (*swap_hdr_in) (bfd *, void *, HDRR *);
385  void (*swap_dnr_in) (bfd *, void *, DNR *);
386  void (*swap_pdr_in) (bfd *, void *, PDR *);
387  void (*swap_sym_in) (bfd *, void *, SYMR *);
388  void (*swap_opt_in) (bfd *, void *, OPTR *);
389  void (*swap_fdr_in) (bfd *, void *, FDR *);
390  void (*swap_rfd_in) (bfd *, void *, RFDT *);
391  void (*swap_ext_in) (bfd *, void *, EXTR *);
392  void (*swap_tir_in) (int, const struct tir_ext *, TIR *);
393  void (*swap_rndx_in) (int, const struct rndx_ext *, RNDXR *);
394  /* Functions to swap out external symbolic data.  */
395  void (*swap_hdr_out) (bfd *, const HDRR *, void *);
396  void (*swap_dnr_out) (bfd *, const DNR *, void *);
397  void (*swap_pdr_out) (bfd *, const PDR *, void *);
398  void (*swap_sym_out) (bfd *, const SYMR *, void *);
399  void (*swap_opt_out) (bfd *, const OPTR *, void *);
400  void (*swap_fdr_out) (bfd *, const FDR *, void *);
401  void (*swap_rfd_out) (bfd *, const RFDT *, void *);
402  void (*swap_ext_out) (bfd *, const EXTR *, void *);
403  void (*swap_tir_out) (int, const TIR *, struct tir_ext *);
404  void (*swap_rndx_out) (int, const RNDXR *, struct rndx_ext *);
405  /* Function to read symbol data and set up pointers in
406     ecoff_debug_info structure.  The section argument is used for
407     ELF, not straight ECOFF.  */
408  bfd_boolean (*read_debug_info) (bfd *, asection *, struct ecoff_debug_info *);
409};
410
411#endif /* ! defined (ECOFF_H) */
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