dump_machdep.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/sys/arm/arm/dump_machdep.c 330897 2018-03-14 03:19:51Z eadler $");
31
32#include "opt_watchdog.h"
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/conf.h>
37#include <sys/sysctl.h>
38#include <sys/kernel.h>
39#include <sys/proc.h>
40#include <sys/kerneldump.h>
41
42#include <vm/vm.h>
43#include <vm/pmap.h>
44#include <machine/dump.h>
45#include <machine/elf.h>
46#include <machine/md_var.h>
47#include <machine/pcb.h>
48#include <machine/armreg.h>
49#include <machine/vmparam.h>	/* For KERNVIRTADDR */
50
51int do_minidump = 1;
52SYSCTL_INT(_debug, OID_AUTO, minidump, CTLFLAG_RWTUN, &do_minidump, 0,
53    "Enable mini crash dumps");
54
55void
56dumpsys_wbinv_all(void)
57{
58
59	/*
60	 * Make sure we write coherent data.  Note that in the SMP case this
61	 * only operates on the L1 cache of the current CPU, but all other CPUs
62	 * have already been stopped, and their flush/invalidate was done as
63	 * part of stopping.
64	 */
65	dcache_wbinv_poc_all();
66#ifdef __XSCALE__
67	xscale_cache_clean_minidata();
68#endif
69}
70
71void
72dumpsys_map_chunk(vm_paddr_t pa, size_t chunk, void **va)
73{
74	vm_paddr_t a;
75	int i;
76
77	for (i = 0; i < chunk; i++) {
78		a = pa + i * PAGE_SIZE;
79		*va = pmap_kenter_temporary(trunc_page(a), i);
80	}
81}
82
83/*
84 * Add a header to be used by libkvm to get the va to pa delta
85 */
86int
87dumpsys_write_aux_headers(struct dumperinfo *di)
88{
89	Elf_Phdr phdr;
90	int error;
91
92	bzero(&phdr, sizeof(phdr));
93	phdr.p_type = PT_DUMP_DELTA;
94	phdr.p_flags = PF_R;			/* XXX */
95	phdr.p_offset = 0;
96	phdr.p_vaddr = KERNVIRTADDR;
97	phdr.p_paddr = pmap_kextract(KERNVIRTADDR);
98	phdr.p_filesz = 0;
99	phdr.p_memsz = 0;
100	phdr.p_align = PAGE_SIZE;
101
102	error = dumpsys_buf_write(di, (char*)&phdr, sizeof(phdr));
103	return (error);
104}
105