1/* BFD back-end for Irix core files.
2   Copyright (C) 1993-2017 Free Software Foundation, Inc.
3   Written by Stu Grossman, Cygnus Support.
4   Converted to back-end form by Ian Lance Taylor, Cygnus Support
5
6   This file is part of BFD, the Binary File Descriptor library.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 3 of the License, or
11   (at your option) any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21   MA 02110-1301, USA.  */
22
23
24/* This file can only be compiled on systems which use Irix style core
25   files (namely, Irix 4 and Irix 5, so far).  */
26
27#include "sysdep.h"
28#include "bfd.h"
29#include "libbfd.h"
30
31#ifdef IRIX_CORE
32
33#include <core.out.h>
34
35struct sgi_core_struct
36{
37  int sig;
38  char cmd[CORE_NAMESIZE];
39};
40
41#define core_hdr(bfd) ((bfd)->tdata.sgi_core_data)
42#define core_signal(bfd) (core_hdr(bfd)->sig)
43#define core_command(bfd) (core_hdr(bfd)->cmd)
44
45#define irix_core_core_file_matches_executable_p generic_core_file_matches_executable_p
46#define irix_core_core_file_pid _bfd_nocore_core_file_pid
47
48static asection *make_bfd_asection
49  (bfd *, const char *, flagword, bfd_size_type, bfd_vma, file_ptr);
50
51/* Helper function for irix_core_core_file_p:
52   32-bit and 64-bit versions.  */
53
54#ifdef CORE_MAGIC64
55static int
56do_sections64 (bfd *abfd, struct coreout *coreout)
57{
58  struct vmap64 vmap;
59  char *secname;
60  int i, val;
61
62  for (i = 0; i < coreout->c_nvmap; i++)
63    {
64      val = bfd_bread (&vmap, (bfd_size_type) sizeof vmap, abfd);
65      if (val != sizeof vmap)
66	break;
67
68      switch (vmap.v_type)
69	{
70	case VDATA:
71	  secname = ".data";
72	  break;
73	case VSTACK:
74	  secname = ".stack";
75	  break;
76#ifdef VMAPFILE
77	case VMAPFILE:
78	  secname = ".mapfile";
79	  break;
80#endif
81	default:
82	  continue;
83	}
84
85      /* A file offset of zero means that the
86	 section is not contained in the corefile.  */
87      if (vmap.v_offset == 0)
88	continue;
89
90      if (!make_bfd_asection (abfd, secname,
91			      SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
92			      vmap.v_len, vmap.v_vaddr, vmap.v_offset))
93	/* Fail.  */
94	return 0;
95    }
96
97  return 1;
98}
99#endif
100
101/* 32-bit version.  */
102
103static int
104do_sections (bfd *abfd, struct coreout *coreout)
105{
106  struct vmap vmap;
107  char *secname;
108  int i, val;
109
110  for (i = 0; i < coreout->c_nvmap; i++)
111    {
112      val = bfd_bread (&vmap, (bfd_size_type) sizeof vmap, abfd);
113      if (val != sizeof vmap)
114	break;
115
116      switch (vmap.v_type)
117	{
118	case VDATA:
119	  secname = ".data";
120	  break;
121	case VSTACK:
122	  secname = ".stack";
123	  break;
124#ifdef VMAPFILE
125	case VMAPFILE:
126	  secname = ".mapfile";
127	  break;
128#endif
129	default:
130	  continue;
131	}
132
133      /* A file offset of zero means that the
134	 section is not contained in the corefile.  */
135      if (vmap.v_offset == 0)
136	continue;
137
138      if (!make_bfd_asection (abfd, secname,
139			      SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS,
140			      vmap.v_len, vmap.v_vaddr, vmap.v_offset))
141	/* Fail.  */
142	return 0;
143    }
144  return 1;
145}
146
147static asection *
148make_bfd_asection (bfd *abfd,
149                   const char *name,
150                   flagword flags,
151                   bfd_size_type size,
152                   bfd_vma vma,
153                   file_ptr filepos)
154{
155  asection *asect;
156
157  asect = bfd_make_section_anyway_with_flags (abfd, name, flags);
158  if (!asect)
159    return NULL;
160
161  asect->size = size;
162  asect->vma = vma;
163  asect->filepos = filepos;
164  asect->alignment_power = 4;
165
166  return asect;
167}
168
169static const bfd_target *
170irix_core_core_file_p (bfd *abfd)
171{
172  int val;
173  struct coreout coreout;
174  struct idesc *idg, *idf, *ids;
175  bfd_size_type amt;
176
177  val = bfd_bread (&coreout, (bfd_size_type) sizeof coreout, abfd);
178  if (val != sizeof coreout)
179    {
180      if (bfd_get_error () != bfd_error_system_call)
181	bfd_set_error (bfd_error_wrong_format);
182      return 0;
183    }
184
185  if (coreout.c_version != CORE_VERSION1)
186    return 0;
187
188  /* Have we got a corefile?  */
189  switch (coreout.c_magic)
190    {
191    case CORE_MAGIC:	break;
192#ifdef CORE_MAGIC64
193    case CORE_MAGIC64:	break;
194#endif
195#ifdef CORE_MAGICN32
196    case CORE_MAGICN32:	break;
197#endif
198    default:		return 0;	/* Un-identifiable or not corefile.  */
199    }
200
201  amt = sizeof (struct sgi_core_struct);
202  core_hdr (abfd) = (struct sgi_core_struct *) bfd_zalloc (abfd, amt);
203  if (!core_hdr (abfd))
204    return NULL;
205
206  strncpy (core_command (abfd), coreout.c_name, CORE_NAMESIZE);
207  core_signal (abfd) = coreout.c_sigcause;
208
209  if (bfd_seek (abfd, coreout.c_vmapoffset, SEEK_SET) != 0)
210    goto fail;
211
212  /* Process corefile sections.  */
213#ifdef CORE_MAGIC64
214  if (coreout.c_magic == (int) CORE_MAGIC64)
215    {
216      if (! do_sections64 (abfd, & coreout))
217	goto fail;
218    }
219  else
220#endif
221    if (! do_sections (abfd, & coreout))
222      goto fail;
223
224  /* Make sure that the regs are contiguous within the core file.  */
225
226  idg = &coreout.c_idesc[I_GPREGS];
227  idf = &coreout.c_idesc[I_FPREGS];
228  ids = &coreout.c_idesc[I_SPECREGS];
229
230  if (idg->i_offset + idg->i_len != idf->i_offset
231      || idf->i_offset + idf->i_len != ids->i_offset)
232    goto fail;			/* Can't deal with non-contig regs */
233
234  if (bfd_seek (abfd, idg->i_offset, SEEK_SET) != 0)
235    goto fail;
236
237  if (!make_bfd_asection (abfd, ".reg",
238			  SEC_HAS_CONTENTS,
239			  idg->i_len + idf->i_len + ids->i_len,
240			  0,
241			  idg->i_offset))
242    goto fail;
243
244  /* OK, we believe you.  You're a core file (sure, sure).  */
245  bfd_default_set_arch_mach (abfd, bfd_arch_mips, 0);
246
247  return abfd->xvec;
248
249 fail:
250  bfd_release (abfd, core_hdr (abfd));
251  core_hdr (abfd) = NULL;
252  bfd_section_list_clear (abfd);
253  return NULL;
254}
255
256static char *
257irix_core_core_file_failing_command (bfd *abfd)
258{
259  return core_command (abfd);
260}
261
262static int
263irix_core_core_file_failing_signal (bfd *abfd)
264{
265  return core_signal (abfd);
266}
267
268/* If somebody calls any byte-swapping routines, shoot them.  */
269static void
270swap_abort(void)
271{
272  abort(); /* This way doesn't require any declaration for ANSI to fuck up */
273}
274
275#define	NO_GET ((bfd_vma (*) (const void *)) swap_abort)
276#define	NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
277#define	NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
278#define	NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
279#define	NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
280#define	NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
281
282const bfd_target core_irix_vec =
283  {
284    "irix-core",
285    bfd_target_unknown_flavour,
286    BFD_ENDIAN_BIG,		/* target byte order */
287    BFD_ENDIAN_BIG,		/* target headers byte order */
288    (HAS_RELOC | EXEC_P |	/* object flags */
289     HAS_LINENO | HAS_DEBUG |
290     HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
291    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
292    0,			                                   /* symbol prefix */
293    ' ',						   /* ar_pad_char */
294    16,							   /* ar_max_namelen */
295    0,							   /* match_priority */
296    NO_GET64, NO_GETS64, NO_PUT64,	/* 64 bit data */
297    NO_GET, NO_GETS, NO_PUT,		/* 32 bit data */
298    NO_GET, NO_GETS, NO_PUT,		/* 16 bit data */
299    NO_GET64, NO_GETS64, NO_PUT64,	/* 64 bit hdrs */
300    NO_GET, NO_GETS, NO_PUT,		/* 32 bit hdrs */
301    NO_GET, NO_GETS, NO_PUT,		/* 16 bit hdrs */
302
303    {				/* bfd_check_format */
304      _bfd_dummy_target,		/* unknown format */
305      _bfd_dummy_target,		/* object file */
306      _bfd_dummy_target,		/* archive */
307      irix_core_core_file_p		/* a core file */
308    },
309    {				/* bfd_set_format */
310      bfd_false, bfd_false,
311      bfd_false, bfd_false
312    },
313    {				/* bfd_write_contents */
314      bfd_false, bfd_false,
315      bfd_false, bfd_false
316    },
317
318    BFD_JUMP_TABLE_GENERIC (_bfd_generic),
319    BFD_JUMP_TABLE_COPY (_bfd_generic),
320    BFD_JUMP_TABLE_CORE (irix_core),
321    BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
322    BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
323    BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
324    BFD_JUMP_TABLE_WRITE (_bfd_generic),
325    BFD_JUMP_TABLE_LINK (_bfd_nolink),
326    BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
327
328    NULL,
329
330    NULL			/* backend_data */
331  };
332
333#endif /* IRIX_CORE */
334