1 /* BFD backend for core files which use the ptrace_user structure
2 Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002, 2003, 2004,
3 2006, 2007 Free Software Foundation, Inc.
4 The structure of this file is based on trad-core.c written by John Gilmore
5 of Cygnus Support.
6 Modified to work with the ptrace_user structure by Kevin A. Buettner.
7 (Longterm it may be better to merge this file with trad-core.c)
8
9 This file is part of BFD, the Binary File Descriptor library.
10
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 2 of the License, or
14 (at your option) any later version.
15
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
20
21 You should have received a copy of the GNU General Public License
22 along with this program; if not, write to the Free Software
23 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
24
25 #ifdef PTRACE_CORE
26
27 #include "sysdep.h"
28 #include "bfd.h"
29 #include "libbfd.h"
30
31 #include <sys/param.h>
32 #include <sys/dir.h>
33 #include <signal.h>
34 #include <sys/ptrace.h>
35
36 struct trad_core_struct
37 {
38 asection *data_section;
39 asection *stack_section;
40 asection *reg_section;
41 struct ptrace_user u;
42 };
43
44 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
45 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
46 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
47 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
48
49 /* forward declarations */
50
51 const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd));
52 char * ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd));
53 int ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd));
54 #define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
55 static void swap_abort PARAMS ((void));
56
57 const bfd_target *
ptrace_unix_core_file_p(abfd)58 ptrace_unix_core_file_p (abfd)
59 bfd *abfd;
60
61 {
62 int val;
63 struct ptrace_user u;
64 struct trad_core_struct *rawptr;
65 bfd_size_type amt;
66 flagword flags;
67
68 val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);
69 if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
70 || u.pt_rev != _BCS_PTRACE_REV)
71 {
72 /* Too small to be a core file */
73 bfd_set_error (bfd_error_wrong_format);
74 return 0;
75 }
76
77 /* OK, we believe you. You're a core file (sure, sure). */
78
79 /* Allocate both the upage and the struct core_data at once, so
80 a single free() will free them both. */
81 amt = sizeof (struct trad_core_struct);
82 rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);
83
84 if (rawptr == NULL)
85 return 0;
86
87 abfd->tdata.trad_core_data = rawptr;
88
89 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
90
91 /* Create the sections. */
92
93 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
94 core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
95 flags);
96 if (core_stacksec (abfd) == NULL)
97 goto fail;
98 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
99 flags);
100 if (core_datasec (abfd) == NULL)
101 goto fail;
102 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
103 SEC_HAS_CONTENTS);
104 if (core_regsec (abfd) == NULL)
105 goto fail;
106
107 /* FIXME: Need to worry about shared memory, library data, and library
108 text. I don't think that any of these things are supported on the
109 system on which I am developing this for though. */
110
111 core_datasec (abfd)->size = u.pt_dsize;
112 core_stacksec (abfd)->size = u.pt_ssize;
113 core_regsec (abfd)->size = sizeof (u);
114
115 core_datasec (abfd)->vma = u.pt_o_data_start;
116 core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
117 core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */
118
119 core_datasec (abfd)->filepos = (int) u.pt_dataptr;
120 core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
121 core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
122
123 /* Align to word at least */
124 core_stacksec (abfd)->alignment_power = 2;
125 core_datasec (abfd)->alignment_power = 2;
126 core_regsec (abfd)->alignment_power = 2;
127
128 return abfd->xvec;
129
130 fail:
131 bfd_release (abfd, abfd->tdata.any);
132 abfd->tdata.any = NULL;
133 bfd_section_list_clear (abfd);
134 return NULL;
135 }
136
137 char *
ptrace_unix_core_file_failing_command(abfd)138 ptrace_unix_core_file_failing_command (abfd)
139 bfd *abfd;
140 {
141 char *com = abfd->tdata.trad_core_data->u.pt_comm;
142 if (*com)
143 return com;
144 else
145 return 0;
146 }
147
148 int
ptrace_unix_core_file_failing_signal(abfd)149 ptrace_unix_core_file_failing_signal (abfd)
150 bfd *abfd;
151 {
152 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
153 }
154
155 /* If somebody calls any byte-swapping routines, shoot them. */
156 static void
swap_abort()157 swap_abort ()
158 {
159 abort (); /* This way doesn't require any declaration for ANSI to fuck up */
160 }
161
162 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
163 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
164 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
165 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
166 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
167 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
168
169 const bfd_target ptrace_core_vec =
170 {
171 "trad-core",
172 bfd_target_unknown_flavour,
173 BFD_ENDIAN_UNKNOWN, /* target byte order */
174 BFD_ENDIAN_UNKNOWN, /* target headers byte order */
175 (HAS_RELOC | EXEC_P | /* object flags */
176 HAS_LINENO | HAS_DEBUG |
177 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
178 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
179 0, /* symbol prefix */
180 ' ', /* ar_pad_char */
181 16, /* ar_max_namelen */
182 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
183 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
184 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
185 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
186 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
187 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
188
189 { /* bfd_check_format */
190 _bfd_dummy_target, /* unknown format */
191 _bfd_dummy_target, /* object file */
192 _bfd_dummy_target, /* archive */
193 ptrace_unix_core_file_p /* a core file */
194 },
195 { /* bfd_set_format */
196 bfd_false, bfd_false,
197 bfd_false, bfd_false
198 },
199 { /* bfd_write_contents */
200 bfd_false, bfd_false,
201 bfd_false, bfd_false
202 },
203
204 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
205 BFD_JUMP_TABLE_COPY (_bfd_generic),
206 BFD_JUMP_TABLE_CORE (ptrace_unix),
207 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
208 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
209 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
210 BFD_JUMP_TABLE_WRITE (_bfd_generic),
211 BFD_JUMP_TABLE_LINK (_bfd_nolink),
212 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
213
214 NULL,
215
216 (PTR) 0 /* backend_data */
217 };
218
219 #endif /* PTRACE_CORE */
220