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>
54 #include <sys/sysent.h>
56 #include <sys/vnode.h>
58 #include <machine/elf.h>
60 #if __ELF_WORD_SIZE == 32
61 #define linux_pt_regset linux_pt_regset32
62 #define bsd_to_linux_regset bsd_to_linux_regset32
63 #include <machine/../linux32/linux.h>
65 #include <machine/../linux/linux.h>
67 #include <compat/linux/linux_elf.h>
68 #include <compat/linux/linux_emul.h>
69 #include <compat/linux/linux_misc.h>
71 /* This adds "linux32_" and "linux64_" prefixes. */
72 #define __linuxN(x) __CONCAT(__CONCAT(__CONCAT(linux,__ELF_WORD_SIZE),_),x)
74 #define LINUX_NT_AUXV 6
76 static void __linuxN(note_fpregset)(void *, struct sbuf *, size_t *);
77 static void __linuxN(note_prpsinfo)(void *, struct sbuf *, size_t *);
78 static void __linuxN(note_prstatus)(void *, struct sbuf *, size_t *);
79 static void __linuxN(note_threadmd)(void *, struct sbuf *, size_t *);
80 static void __linuxN(note_nt_auxv)(void *, struct sbuf *, size_t *);
83 __linuxN(prepare_notes)(struct thread *td, struct note_info_list *list,
94 * To have the debugger select the right thread (LWP) as the initial
95 * thread, we dump the state of the thread passed to us in td first.
96 * This is the thread that causes the core dump and thus likely to
97 * be the right thread one wants to have selected in the debugger.
100 while (thr != NULL) {
101 size += __elfN(register_note)(td, list,
102 NT_PRSTATUS, __linuxN(note_prstatus), thr);
103 size += __elfN(register_note)(td, list,
104 NT_PRPSINFO, __linuxN(note_prpsinfo), p);
105 size += __elfN(register_note)(td, list,
106 LINUX_NT_AUXV, __linuxN(note_nt_auxv), p);
107 size += __elfN(register_note)(td, list,
108 NT_FPREGSET, __linuxN(note_fpregset), thr);
109 size += __elfN(register_note)(td, list,
110 -1, __linuxN(note_threadmd), thr);
112 thr = thr == td ? TAILQ_FIRST(&p->p_threads) :
113 TAILQ_NEXT(thr, td_plist);
115 thr = TAILQ_NEXT(thr, td_plist);
121 typedef struct linux_elf_prstatus linux_elf_prstatus_t;
122 #if __ELF_WORD_SIZE == 32
123 typedef struct prpsinfo32 linux_elf_prpsinfo_t;
124 typedef struct fpreg32 linux_elf_prfpregset_t;
126 typedef prpsinfo_t linux_elf_prpsinfo_t;
127 typedef prfpregset_t linux_elf_prfpregset_t;
131 __linuxN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
137 linux_elf_prpsinfo_t *psinfo;
142 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
143 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
144 psinfo->pr_version = PRPSINFO_VERSION;
145 psinfo->pr_psinfosz = sizeof(linux_elf_prpsinfo_t);
146 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
148 if (p->p_args != NULL) {
149 len = sizeof(psinfo->pr_psargs) - 1;
150 if (len > p->p_args->ar_length)
151 len = p->p_args->ar_length;
152 memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
158 sbuf_new(&sbarg, psinfo->pr_psargs,
159 sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
160 error = proc_getargv(curthread, p, &sbarg);
162 if (sbuf_finish(&sbarg) == 0)
163 len = sbuf_len(&sbarg) - 1;
165 len = sizeof(psinfo->pr_psargs) - 1;
168 if (error || len == 0)
169 strlcpy(psinfo->pr_psargs, p->p_comm,
170 sizeof(psinfo->pr_psargs));
172 KASSERT(len < sizeof(psinfo->pr_psargs),
173 ("len is too long: %zu vs %zu", len,
174 sizeof(psinfo->pr_psargs)));
175 cp = psinfo->pr_psargs;
178 cp = memchr(cp, '\0', end - cp);
184 psinfo->pr_pid = p->p_pid;
185 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
186 free(psinfo, M_TEMP);
188 *sizep = sizeof(*psinfo);
192 __linuxN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
195 linux_elf_prstatus_t *status;
196 #if __ELF_WORD_SIZE == 32
204 KASSERT(*sizep == sizeof(*status), ("invalid size"));
205 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
208 * XXX: Some fields missing.
210 status->pr_cursig = td->td_proc->p_sig;
211 status->pr_pid = td->td_tid;
213 #if __ELF_WORD_SIZE == 32
214 fill_regs32(td, &pr_reg);
216 fill_regs(td, &pr_reg);
218 bsd_to_linux_regset(&pr_reg, &status->pr_reg);
219 sbuf_bcat(sb, status, sizeof(*status));
220 free(status, M_TEMP);
222 *sizep = sizeof(*status);
226 __linuxN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
229 linux_elf_prfpregset_t *fpregset;
233 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
234 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
235 #if __ELF_WORD_SIZE == 32
236 fill_fpregs32(td, fpregset);
238 fill_fpregs(td, fpregset);
240 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
241 free(fpregset, M_TEMP);
243 *sizep = sizeof(*fpregset);
247 * Allow for MD specific notes, as well as any MD
248 * specific preparations for writing MI notes.
251 __linuxN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
259 if (size != 0 && sb != NULL)
260 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
264 __elfN(dump_thread)(td, buf, &size);
265 KASSERT(sb == NULL || *sizep == size, ("invalid size"));
266 if (size != 0 && sb != NULL)
267 sbuf_bcat(sb, buf, size);
273 __linuxN(note_nt_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
281 sb = sbuf_new(NULL, NULL, LINUX_AT_COUNT * sizeof(Elf_Auxinfo),
283 sbuf_set_drain(sb, sbuf_count_drain, &size);
285 proc_getauxv(curthread, p, sb);
292 proc_getauxv(curthread, p, sb);