2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2021 Edward Tomasz Napierala <trasz@FreeBSD.org>
5 * Copyright (c) 2018 Chuck Tuffli
6 * Copyright (c) 2017 Dell EMC
7 * Copyright (c) 2000 David O'Brien
8 * Copyright (c) 1995-1996 Søren Schmidt
9 * Copyright (c) 1996 Peter Wemm
10 * All rights reserved.
12 * This software was developed by the University of Cambridge Computer
13 * Laboratory as part of the CHERI for Hypervisors and Operating Systems
14 * (CHaOS) project, funded by EPSRC grant EP/V000292/1.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer
21 * in this position and unchanged.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 * 3. The name of the author may not be used to endorse or promote products
26 * derived from this software without specific prior written permission
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
29 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
30 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
31 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
33 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
34 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
35 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
36 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
37 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
43 #include <sys/param.h>
44 #include <sys/systm.h>
46 #include <sys/imgact.h>
47 #include <sys/imgact_elf.h>
48 #include <sys/kernel.h>
50 #include <sys/procfs.h>
51 #include <sys/ptrace.h>
53 #include <sys/sysent.h>
55 #include <sys/vnode.h>
57 #include <machine/elf.h>
59 #if __ELF_WORD_SIZE == 32
60 #define linux_pt_regset linux_pt_regset32
61 #define bsd_to_linux_regset bsd_to_linux_regset32
62 #include <machine/../linux32/linux.h>
64 #include <machine/../linux/linux.h>
66 #include <compat/linux/linux_elf.h>
67 #include <compat/linux/linux_emul.h>
68 #include <compat/linux/linux_misc.h>
70 /* This adds "linux32_" and "linux64_" prefixes. */
71 #define __linuxN(x) __CONCAT(__CONCAT(__CONCAT(linux,__ELF_WORD_SIZE),_),x)
73 #define LINUX_NT_AUXV 6
75 static void __linuxN(note_fpregset)(void *, struct sbuf *, size_t *);
76 static void __linuxN(note_prpsinfo)(void *, struct sbuf *, size_t *);
77 static void __linuxN(note_prstatus)(void *, struct sbuf *, size_t *);
78 static void __linuxN(note_threadmd)(void *, struct sbuf *, size_t *);
79 static void __linuxN(note_nt_auxv)(void *, struct sbuf *, size_t *);
82 __linuxN(prepare_notes)(struct thread *td, struct note_info_list *list,
93 * To have the debugger select the right thread (LWP) as the initial
94 * thread, we dump the state of the thread passed to us in td first.
95 * This is the thread that causes the core dump and thus likely to
96 * be the right thread one wants to have selected in the debugger.
100 size += __elfN(register_note)(td, list,
101 NT_PRSTATUS, __linuxN(note_prstatus), thr);
102 size += __elfN(register_note)(td, list,
103 NT_PRPSINFO, __linuxN(note_prpsinfo), p);
104 size += __elfN(register_note)(td, list,
105 LINUX_NT_AUXV, __linuxN(note_nt_auxv), p);
106 size += __elfN(register_note)(td, list,
107 NT_FPREGSET, __linuxN(note_fpregset), thr);
108 size += __elfN(register_note)(td, list,
109 -1, __linuxN(note_threadmd), thr);
111 thr = thr == td ? TAILQ_FIRST(&p->p_threads) :
112 TAILQ_NEXT(thr, td_plist);
114 thr = TAILQ_NEXT(thr, td_plist);
120 typedef struct linux_elf_prstatus linux_elf_prstatus_t;
121 #if __ELF_WORD_SIZE == 32
122 typedef struct prpsinfo32 linux_elf_prpsinfo_t;
123 typedef struct fpreg32 linux_elf_prfpregset_t;
125 typedef prpsinfo_t linux_elf_prpsinfo_t;
126 typedef prfpregset_t linux_elf_prfpregset_t;
130 __linuxN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
136 linux_elf_prpsinfo_t *psinfo;
141 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
142 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
143 psinfo->pr_version = PRPSINFO_VERSION;
144 psinfo->pr_psinfosz = sizeof(linux_elf_prpsinfo_t);
145 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
147 if (p->p_args != NULL) {
148 len = sizeof(psinfo->pr_psargs) - 1;
149 if (len > p->p_args->ar_length)
150 len = p->p_args->ar_length;
151 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
157 sbuf_new(&sbarg, psinfo->pr_psargs,
158 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
159 error = proc_getargv(curthread, p, &sbarg);
161 if (sbuf_finish(&sbarg) == 0)
162 len = sbuf_len(&sbarg) - 1;
164 len = sizeof(psinfo->pr_psargs) - 1;
167 if (error || len == 0)
168 strlcpy(psinfo->pr_psargs, p->p_comm,
169 sizeof(psinfo->pr_psargs));
171 KASSERT(len < sizeof(psinfo->pr_psargs),
172 ("len is too long: %zu vs %zu", len,
173 sizeof(psinfo->pr_psargs)));
174 cp = psinfo->pr_psargs;
177 cp = memchr(cp, '\0', end - cp);
183 psinfo->pr_pid = p->p_pid;
184 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
185 free(psinfo, M_TEMP);
187 *sizep = sizeof(*psinfo);
191 __linuxN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
194 linux_elf_prstatus_t *status;
195 #if __ELF_WORD_SIZE == 32
203 KASSERT(*sizep == sizeof(*status), ("invalid size"));
204 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
207 * XXX: Some fields missing.
209 status->pr_cursig = td->td_proc->p_sig;
210 status->pr_pid = td->td_tid;
212 #if __ELF_WORD_SIZE == 32
213 fill_regs32(td, &pr_reg);
215 fill_regs(td, &pr_reg);
217 bsd_to_linux_regset(&pr_reg, &status->pr_reg);
218 sbuf_bcat(sb, status, sizeof(*status));
219 free(status, M_TEMP);
221 *sizep = sizeof(*status);
225 __linuxN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
228 linux_elf_prfpregset_t *fpregset;
232 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
233 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
234 #if __ELF_WORD_SIZE == 32
235 fill_fpregs32(td, fpregset);
237 fill_fpregs(td, fpregset);
239 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
240 free(fpregset, M_TEMP);
242 *sizep = sizeof(*fpregset);
246 * Allow for MD specific notes, as well as any MD
247 * specific preparations for writing MI notes.
250 __linuxN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
258 if (size != 0 && sb != NULL)
259 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
263 __elfN(dump_thread)(td, buf, &size);
264 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
265 if (size != 0 && sb != NULL)
266 sbuf_bcat(sb, buf, size);
272 __linuxN(note_nt_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
280 sb = sbuf_new(NULL, NULL, LINUX_AT_COUNT * sizeof(Elf_Auxinfo),
282 sbuf_set_drain(sb, sbuf_count_drain, &size);
284 proc_getauxv(curthread, p, sb);
291 proc_getauxv(curthread, p, sb);