2021-06-30 16:45:21 +00:00
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2021 Edward Tomasz Napierala <trasz@FreeBSD.org>
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* Copyright (c) 2018 Chuck Tuffli
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* Copyright (c) 2017 Dell EMC
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* Copyright (c) 2000 David O'Brien
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* Copyright (c) 1995-1996 Søren Schmidt
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* Copyright (c) 1996 Peter Wemm
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* All rights reserved.
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*
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* This software was developed by the University of Cambridge Computer
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* Laboratory as part of the CHERI for Hypervisors and Operating Systems
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* (CHaOS) project, funded by EPSRC grant EP/V000292/1.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/imgact.h>
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#include <sys/imgact_elf.h>
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2021-11-13 03:26:27 +00:00
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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2021-06-30 16:45:21 +00:00
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#include <sys/proc.h>
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#include <sys/procfs.h>
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2021-08-27 09:38:40 +00:00
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#include <sys/reg.h>
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2021-06-30 16:45:21 +00:00
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#include <sys/sbuf.h>
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#include <machine/elf.h>
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#if __ELF_WORD_SIZE == 32
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#define linux_pt_regset linux_pt_regset32
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#define bsd_to_linux_regset bsd_to_linux_regset32
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#include <machine/../linux32/linux.h>
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#else
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#include <machine/../linux/linux.h>
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#endif
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#include <compat/linux/linux_elf.h>
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#include <compat/linux/linux_emul.h>
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#include <compat/linux/linux_misc.h>
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/* This adds "linux32_" and "linux64_" prefixes. */
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#define __linuxN(x) __CONCAT(__CONCAT(__CONCAT(linux,__ELF_WORD_SIZE),_),x)
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#define LINUX_NT_AUXV 6
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static void __linuxN(note_fpregset)(void *, struct sbuf *, size_t *);
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static void __linuxN(note_prpsinfo)(void *, struct sbuf *, size_t *);
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static void __linuxN(note_prstatus)(void *, struct sbuf *, size_t *);
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static void __linuxN(note_threadmd)(void *, struct sbuf *, size_t *);
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static void __linuxN(note_nt_auxv)(void *, struct sbuf *, size_t *);
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void
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__linuxN(prepare_notes)(struct thread *td, struct note_info_list *list,
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size_t *sizep)
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{
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struct proc *p;
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struct thread *thr;
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size_t size;
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p = td->td_proc;
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size = 0;
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/*
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* To have the debugger select the right thread (LWP) as the initial
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* thread, we dump the state of the thread passed to us in td first.
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* This is the thread that causes the core dump and thus likely to
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* be the right thread one wants to have selected in the debugger.
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*/
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thr = td;
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while (thr != NULL) {
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size += __elfN(register_note)(td, list,
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NT_PRSTATUS, __linuxN(note_prstatus), thr);
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size += __elfN(register_note)(td, list,
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NT_PRPSINFO, __linuxN(note_prpsinfo), p);
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size += __elfN(register_note)(td, list,
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LINUX_NT_AUXV, __linuxN(note_nt_auxv), p);
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size += __elfN(register_note)(td, list,
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NT_FPREGSET, __linuxN(note_fpregset), thr);
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size += __elfN(register_note)(td, list,
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-1, __linuxN(note_threadmd), thr);
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thr = thr == td ? TAILQ_FIRST(&p->p_threads) :
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TAILQ_NEXT(thr, td_plist);
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if (thr == td)
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thr = TAILQ_NEXT(thr, td_plist);
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}
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*sizep = size;
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}
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typedef struct linux_elf_prstatus linux_elf_prstatus_t;
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#if __ELF_WORD_SIZE == 32
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typedef struct prpsinfo32 linux_elf_prpsinfo_t;
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typedef struct fpreg32 linux_elf_prfpregset_t;
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#else
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typedef prpsinfo_t linux_elf_prpsinfo_t;
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typedef prfpregset_t linux_elf_prfpregset_t;
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#endif
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static void
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__linuxN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
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{
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struct sbuf sbarg;
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size_t len;
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char *cp, *end;
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struct proc *p;
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linux_elf_prpsinfo_t *psinfo;
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int error;
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p = arg;
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if (sb != NULL) {
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KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
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psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
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psinfo->pr_version = PRPSINFO_VERSION;
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psinfo->pr_psinfosz = sizeof(linux_elf_prpsinfo_t);
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strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
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PROC_LOCK(p);
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if (p->p_args != NULL) {
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len = sizeof(psinfo->pr_psargs) - 1;
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if (len > p->p_args->ar_length)
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len = p->p_args->ar_length;
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memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
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PROC_UNLOCK(p);
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error = 0;
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} else {
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_PHOLD(p);
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PROC_UNLOCK(p);
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sbuf_new(&sbarg, psinfo->pr_psargs,
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sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
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error = proc_getargv(curthread, p, &sbarg);
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PRELE(p);
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2022-06-03 08:21:23 +00:00
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if (sbuf_finish(&sbarg) == 0) {
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2021-06-30 16:45:21 +00:00
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len = sbuf_len(&sbarg) - 1;
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2022-06-03 08:21:23 +00:00
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if (len > 0)
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len--;
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} else {
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2021-06-30 16:45:21 +00:00
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len = sizeof(psinfo->pr_psargs) - 1;
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2022-06-03 08:21:23 +00:00
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}
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2021-06-30 16:45:21 +00:00
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sbuf_delete(&sbarg);
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}
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2022-06-03 08:21:23 +00:00
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if (error != 0 || len == 0 || (ssize_t)len == -1)
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2021-06-30 16:45:21 +00:00
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strlcpy(psinfo->pr_psargs, p->p_comm,
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sizeof(psinfo->pr_psargs));
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else {
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KASSERT(len < sizeof(psinfo->pr_psargs),
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("len is too long: %zu vs %zu", len,
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sizeof(psinfo->pr_psargs)));
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cp = psinfo->pr_psargs;
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end = cp + len - 1;
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for (;;) {
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cp = memchr(cp, '\0', end - cp);
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if (cp == NULL)
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break;
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*cp = ' ';
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}
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}
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psinfo->pr_pid = p->p_pid;
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sbuf_bcat(sb, psinfo, sizeof(*psinfo));
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free(psinfo, M_TEMP);
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}
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*sizep = sizeof(*psinfo);
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}
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static void
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__linuxN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
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{
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struct thread *td;
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linux_elf_prstatus_t *status;
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#if __ELF_WORD_SIZE == 32
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struct reg32 pr_reg;
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#else
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struct reg pr_reg;
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#endif
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td = arg;
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if (sb != NULL) {
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KASSERT(*sizep == sizeof(*status), ("invalid size"));
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status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
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/*
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* XXX: Some fields missing.
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*/
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status->pr_cursig = td->td_proc->p_sig;
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status->pr_pid = td->td_tid;
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#if __ELF_WORD_SIZE == 32
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fill_regs32(td, &pr_reg);
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#else
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fill_regs(td, &pr_reg);
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#endif
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bsd_to_linux_regset(&pr_reg, &status->pr_reg);
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sbuf_bcat(sb, status, sizeof(*status));
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free(status, M_TEMP);
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}
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*sizep = sizeof(*status);
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}
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static void
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__linuxN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
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{
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struct thread *td;
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linux_elf_prfpregset_t *fpregset;
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td = arg;
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if (sb != NULL) {
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KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
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fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
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#if __ELF_WORD_SIZE == 32
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fill_fpregs32(td, fpregset);
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#else
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fill_fpregs(td, fpregset);
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#endif
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sbuf_bcat(sb, fpregset, sizeof(*fpregset));
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free(fpregset, M_TEMP);
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}
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*sizep = sizeof(*fpregset);
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}
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/*
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* Allow for MD specific notes, as well as any MD
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* specific preparations for writing MI notes.
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*/
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static void
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__linuxN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
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{
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struct thread *td;
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void *buf;
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size_t size;
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td = arg;
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size = *sizep;
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if (size != 0 && sb != NULL)
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buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
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else
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buf = NULL;
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size = 0;
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__elfN(dump_thread)(td, buf, &size);
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KASSERT(sb == NULL || *sizep == size, ("invalid size"));
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if (size != 0 && sb != NULL)
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sbuf_bcat(sb, buf, size);
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free(buf, M_TEMP);
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*sizep = size;
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}
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static void
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__linuxN(note_nt_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
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{
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struct proc *p;
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size_t size;
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p = arg;
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if (sb == NULL) {
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size = 0;
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sb = sbuf_new(NULL, NULL, LINUX_AT_COUNT * sizeof(Elf_Auxinfo),
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SBUF_FIXEDLEN);
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sbuf_set_drain(sb, sbuf_count_drain, &size);
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PHOLD(p);
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proc_getauxv(curthread, p, sb);
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PRELE(p);
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sbuf_finish(sb);
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sbuf_delete(sb);
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*sizep = size;
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} else {
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PHOLD(p);
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proc_getauxv(curthread, p, sb);
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PRELE(p);
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}
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}
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