ppc64_elf_freebsd.c revision 303975 
1/*-
2 * Copyright (c) 2001 Benno Rice <benno@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: releng/11.0/sys/boot/powerpc/kboot/ppc64_elf_freebsd.c 291598 2015-12-01 17:01:27Z nwhitehorn $");
29
30#define __ELF_WORD_SIZE 64
31
32#include <sys/param.h>
33#include <sys/linker.h>
34
35#include <machine/metadata.h>
36#include <machine/elf.h>
37
38#include <stand.h>
39
40#include "bootstrap.h"
41#include "host_syscall.h"
42
43extern char		end[];
44extern void		*kerneltramp;
45extern size_t		szkerneltramp;
46extern int		nkexec_segments;
47extern void *		loaded_segments;
48
49int
50ppc64_elf_loadfile(char *filename, u_int64_t dest,
51    struct preloaded_file **result)
52{
53	int	r;
54
55	r = __elfN(loadfile)(filename, dest, result);
56	if (r != 0)
57		return (r);
58
59	return (0);
60}
61
62int
63ppc64_elf_exec(struct preloaded_file *fp)
64{
65	struct file_metadata	*fmp;
66	vm_offset_t		mdp, dtb;
67	Elf_Ehdr		*e;
68	int			error;
69	uint32_t		*trampoline;
70	uint64_t		entry;
71	vm_offset_t		trampolinebase;
72
73	if ((fmp = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL) {
74		return(EFTYPE);
75	}
76	e = (Elf_Ehdr *)&fmp->md_data;
77
78	/* Figure out where to put it */
79	trampolinebase = archsw.arch_loadaddr(LOAD_RAW, NULL, 0);
80
81	/* Set up loader trampoline */
82	trampoline = malloc(szkerneltramp);
83	memcpy(trampoline, &kerneltramp, szkerneltramp);
84	/* Parse function descriptor for ELFv1 kernels */
85	if ((e->e_flags & 3) == 2)
86		entry = e->e_entry;
87	else
88		archsw.arch_copyout(e->e_entry + elf64_relocation_offset,
89		    &entry, 8);
90	trampoline[2] = entry + elf64_relocation_offset;
91	trampoline[4] = 0; /* Phys. mem offset */
92	trampoline[5] = 0; /* OF entry point */
93
94	if ((error = md_load64(fp->f_args, &mdp, &dtb)) != 0)
95		return (error);
96
97	trampoline[3] = dtb;
98	trampoline[6] = mdp;
99	trampoline[7] = sizeof(mdp);
100	printf("Kernel entry at %#jx (%#x) ...\n", e->e_entry, trampoline[2]);
101	printf("DTB at %#x, mdp at %#x\n", dtb, mdp);
102
103	dev_cleanup();
104
105	archsw.arch_copyin(trampoline, trampolinebase, szkerneltramp);
106	free(trampoline);
107
108	error = kexec_load(trampolinebase, nkexec_segments, &loaded_segments);
109	if (error != 0)
110		panic("kexec_load returned error: %d", error);
111	error = host_reboot(0xfee1dead, 672274793,
112	    0x45584543 /* LINUX_REBOOT_CMD_KEXEC */, NULL);
113	if (error != 0)
114		panic("reboot returned error: %d", error);
115	while (1) {}
116
117	panic("exec returned");
118}
119
120struct file_format	ppc_elf64 =
121{
122	ppc64_elf_loadfile,
123	ppc64_elf_exec
124};
125