1 /* BFD backend for core files which use the ptrace_user structure
2 Copyright (C) 1993-2023 Free Software Foundation, Inc.
3 The structure of this file is based on trad-core.c written by John Gilmore
4 of Cygnus Support.
5 Modified to work with the ptrace_user structure by Kevin A. Buettner.
6 (Longterm it may be better to merge this file with trad-core.c)
7
8 This file is part of BFD, the Binary File Descriptor library.
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
23 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 bfd_cleanup ptrace_unix_core_file_p (bfd *abfd);
52 char * ptrace_unix_core_file_failing_command (bfd *abfd);
53 int ptrace_unix_core_file_failing_signal (bfd *abfd);
54 #define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
55 #define ptrace_unix_core_file_pid _bfd_nocore_core_file_pid
56 static void swap_abort (void);
57
58 bfd_cleanup
59 ptrace_unix_core_file_p (bfd *abfd)
60 {
61 int val;
62 struct ptrace_user u;
63 struct trad_core_struct *rawptr;
64 size_t amt;
65 flagword flags;
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 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
93 core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
94 flags);
95 if (core_stacksec (abfd) == NULL)
96 goto fail;
97 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
98 flags);
99 if (core_datasec (abfd) == NULL)
100 goto fail;
101 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
102 SEC_HAS_CONTENTS);
103 if (core_regsec (abfd) == NULL)
104 goto fail;
105
106 /* FIXME: Need to worry about shared memory, library data, and library
107 text. I don't think that any of these things are supported on the
108 system on which I am developing this for though. */
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 _bfd_no_cleanup;
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 *
137 ptrace_unix_core_file_failing_command (bfd *abfd)
138 {
139 char *com = abfd->tdata.trad_core_data->u.pt_comm;
140
141 if (*com)
142 return com;
143 else
144 return 0;
145 }
146
147 int
148 ptrace_unix_core_file_failing_signal (bfd *abfd)
149 {
150 return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
151 }
152
153 /* If somebody calls any byte-swapping routines, shoot them. */
154 static void
155 swap_abort (void)
156 {
157 abort (); /* This way doesn't require any declaration for ANSI to fuck up */
158 }
159
160 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
161 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
162 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
163 #define NO_GET64 ((uint64_t (*) (const void *)) swap_abort)
164 #define NO_PUT64 ((void (*) (uint64_t, void *)) swap_abort)
165 #define NO_GETS64 ((int64_t (*) (const void *)) swap_abort)
166
167 const bfd_target core_ptrace_vec =
168 {
169 "trad-core",
170 bfd_target_unknown_flavour,
171 BFD_ENDIAN_UNKNOWN, /* target byte order */
172 BFD_ENDIAN_UNKNOWN, /* target headers byte order */
173 (HAS_RELOC | EXEC_P | /* object flags */
174 HAS_LINENO | HAS_DEBUG |
175 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
176 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
177 0, /* symbol prefix */
178 ' ', /* ar_pad_char */
179 16, /* ar_max_namelen */
180 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
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_bool_bfd_false_error, bfd_false,
196 _bfd_bool_bfd_false_error, bfd_false
197 },
198 { /* bfd_write_contents */
199 _bfd_bool_bfd_false_error, bfd_false,
200 _bfd_bool_bfd_false_error, 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 NULL /* backend_data */
216 };
217
218 #endif /* PTRACE_CORE */