exec.c revision 329175 
1/*-
2 * Copyright (c) 2013-2014 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * This software was developed by SRI International and the University of
6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
7 * ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/11/stand/mips/beri/loader/exec.c 329175 2018-02-12 17:44:35Z kevans $");
33
34#include <sys/param.h>
35#include <sys/linker.h>
36
37#include <machine/bootinfo.h>
38#include <machine/elf.h>
39
40#include <bootstrap.h>
41#include <loader.h>
42#include <mips.h>
43#include <stand.h>
44
45static int	beri_elf64_loadfile(char *, uint64_t,
46		    struct preloaded_file **);
47static int	beri_elf64_exec(struct preloaded_file *fp);
48
49struct file_format beri_elf = {
50	.l_load = beri_elf64_loadfile,
51	.l_exec = beri_elf64_exec,
52};
53
54/*
55 * bootinfo that we will pass onto the kernel; some fields derived from
56 * *boot2_bootinfop, others filled in by loader.
57 */
58struct bootinfo	bootinfo;
59
60static int
61beri_elf64_loadfile(char *filename, uint64_t dest,
62    struct preloaded_file **result)
63{
64
65	/*
66	 * Some platforms require invalidation of instruction caches here; we
67	 * don't need that currently.
68	 */
69	return (__elfN(loadfile)(filename, dest, result));
70}
71
72static int
73beri_elf64_exec(struct preloaded_file *fp)
74{
75	void (*entry)(register_t, register_t, register_t, register_t);
76	struct file_metadata *md;
77	vm_offset_t mdp;
78	Elf_Ehdr *ehdr;
79	int error;
80
81	md = file_findmetadata(fp, MODINFOMD_ELFHDR);
82	if (md == NULL) {
83		printf("%s: file_findmetadata failed\n");
84		return (EFTYPE);
85	}
86	ehdr = (Elf_Ehdr *)md->md_data;
87
88	error = md_load64(fp->f_args, &mdp);
89	if (error) {
90		printf("%s: md_load64 failed\n");
91		return (error);
92	}
93
94	entry = (void *)ehdr->e_entry;
95	printf("Kernel entry at %p\n", entry);
96
97	dev_cleanup();		/* XXXRW: Required? */
98	printf("Kernel args: %s\n", fp->f_args);
99
100	/*
101	 * Configure bootinfo for the loaded kernel.  Some values are
102	 * inherited from the bootinfo passed to us by boot2 (e.g., DTB
103	 * pointer); others are local to the loader (e.g., kernel boot flags).
104	 */
105	bzero(&bootinfo, sizeof(bootinfo));
106	bootinfo.bi_version = BOOTINFO_VERSION;
107	bootinfo.bi_size = sizeof(bootinfo);
108	bootinfo.bi_boot2opts = boot2_bootinfo.bi_boot2opts;
109	/* NB: bi_kernelname used only by boot2. */
110	/* NB: bi_nfs_diskless not yet. */
111	bootinfo.bi_dtb = boot2_bootinfo.bi_dtb;
112	bootinfo.bi_memsize = boot2_bootinfo.bi_memsize;
113	bootinfo.bi_modulep = mdp;
114
115	/*
116	 * XXXRW: For now, pass 'memsize' rather than dtb or bootinfo.  This
117	 * is the 'old' ABI spoken by Miniboot and the kernel.  To pass in
118	 * boot2opts, modules, etc, we will need to fix this to pass in at
119	 * least bootinfop.
120	 */
121	(*entry)(boot2_argc, (register_t)boot2_argv, (register_t)boot2_envv,
122	    (register_t)&bootinfo);
123
124	panic("exec returned");
125}
126