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 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 "bfd.h"
28 #include "sysdep.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
67 val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);
68 if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
69 || u.pt_rev != _BCS_PTRACE_REV)
70 {
71 /* Too small to be a core file */
72 bfd_set_error (bfd_error_wrong_format);
73 return 0;
74 }
75
76 /* OK, we believe you. You're a core file (sure, sure). */
77
78 /* Allocate both the upage and the struct core_data at once, so
79 a single free() will free them both. */
80 amt = sizeof (struct trad_core_struct);
81 rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);
82
83 if (rawptr == NULL)
84 return 0;
85
86 abfd->tdata.trad_core_data = rawptr;
87
88 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
89
90 /* Create the sections. */
91
92 core_stacksec (abfd) = bfd_make_section_anyway (abfd, ".stack");
93 if (core_stacksec (abfd) == NULL)
94 goto fail;
95 core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data");
96 if (core_datasec (abfd) == NULL)
97 goto fail;
98 core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg");
99 if (core_regsec (abfd) == NULL)
100 goto fail;
101
102 /* FIXME: Need to worry about shared memory, library data, and library
103 text. I don't think that any of these things are supported on the
104 system on which I am developing this for though. */
105
106 core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
107 core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
108 core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
109
110 core_datasec (abfd)->size = u.pt_dsize;
111 core_stacksec (abfd)->size = u.pt_ssize;
112 core_regsec (abfd)->size = sizeof (u);
113
114 core_datasec (abfd)->vma = u.pt_o_data_start;
115 core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
116 core_regsec (abfd)->vma = 0 - sizeof (u); /* see trad-core.c */
117
118 core_datasec (abfd)->filepos = (int) u.pt_dataptr;
119 core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
120 core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
121
122 /* Align to word at least */
123 core_stacksec (abfd)->alignment_power = 2;
124 core_datasec (abfd)->alignment_power = 2;
125 core_regsec (abfd)->alignment_power = 2;
126
127 return abfd->xvec;
128
129 fail:
130 bfd_release (abfd, abfd->tdata.any);
131 abfd->tdata.any = NULL;
132 bfd_section_list_clear (abfd);
133 return NULL;
134 }
135
136 char *
ptrace_unix_core_file_failing_command(abfd)137 ptrace_unix_core_file_failing_command (abfd)
138 bfd *abfd;
139 {
140 char *com = abfd->tdata.trad_core_data->u.pt_comm;
141 if (*com)
142 return com;
143 else
144 return 0;
145 }
146
147 int
ptrace_unix_core_file_failing_signal(abfd)148 ptrace_unix_core_file_failing_signal (abfd)
149 bfd *abfd;
150 {
151 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
152 }
153
154 /* If somebody calls any byte-swapping routines, shoot them. */
155 static void
swap_abort()156 swap_abort ()
157 {
158 abort (); /* This way doesn't require any declaration for ANSI to fuck up */
159 }
160
161 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
162 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
163 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
164 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
165 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
166 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
167
168 const bfd_target ptrace_core_vec =
169 {
170 "trad-core",
171 bfd_target_unknown_flavour,
172 BFD_ENDIAN_UNKNOWN, /* target byte order */
173 BFD_ENDIAN_UNKNOWN, /* target headers byte order */
174 (HAS_RELOC | EXEC_P | /* object flags */
175 HAS_LINENO | HAS_DEBUG |
176 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
177 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
178 0, /* symbol prefix */
179 ' ', /* ar_pad_char */
180 16, /* ar_max_namelen */
181 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
182 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
183 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
184 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
185 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
186 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
187
188 { /* bfd_check_format */
189 _bfd_dummy_target, /* unknown format */
190 _bfd_dummy_target, /* object file */
191 _bfd_dummy_target, /* archive */
192 ptrace_unix_core_file_p /* a core file */
193 },
194 { /* bfd_set_format */
195 bfd_false, bfd_false,
196 bfd_false, bfd_false
197 },
198 { /* bfd_write_contents */
199 bfd_false, bfd_false,
200 bfd_false, bfd_false
201 },
202
203 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
204 BFD_JUMP_TABLE_COPY (_bfd_generic),
205 BFD_JUMP_TABLE_CORE (ptrace_unix),
206 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
207 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
208 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
209 BFD_JUMP_TABLE_WRITE (_bfd_generic),
210 BFD_JUMP_TABLE_LINK (_bfd_nolink),
211 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
212
213 NULL,
214
215 (PTR) 0 /* backend_data */
216 };
217
218 #endif /* PTRACE_CORE */
219