xref: /freebsd/stand/i386/libi386/elf64_freebsd.c (revision 3e15b01d)
1 /*-
2  * Copyright (c) 1998 Michael Smith <msmith@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 #define __ELF_WORD_SIZE 64
28 #include <sys/param.h>
29 #include <sys/exec.h>
30 #include <sys/linker.h>
31 #include <string.h>
32 #include <machine/bootinfo.h>
33 #include <machine/elf.h>
34 #include <stand.h>
35 
36 #include "bootstrap.h"
37 #include "libi386.h"
38 #include "btxv86.h"
39 
40 static int	elf64_exec(struct preloaded_file *amp);
41 static int	elf64_obj_exec(struct preloaded_file *amp);
42 
43 struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
44 struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec };
45 
46 #define PG_V	0x001
47 #define PG_RW	0x002
48 #define PG_PS	0x080
49 
50 typedef uint64_t p4_entry_t;
51 typedef uint64_t p3_entry_t;
52 typedef uint64_t p2_entry_t;
53 extern p4_entry_t PT4[];
54 extern p3_entry_t PT3[];
55 extern p2_entry_t PT2[];
56 
57 uint32_t entry_hi;
58 uint32_t entry_lo;
59 
60 extern void amd64_tramp();
61 
62 /*
63  * There is an ELF kernel and one or more ELF modules loaded.
64  * We wish to start executing the kernel image, so make such
65  * preparations as are required, and do so.
66  */
67 static int
elf64_exec(struct preloaded_file * fp)68 elf64_exec(struct preloaded_file *fp)
69 {
70     struct file_metadata	*md;
71     Elf_Ehdr 			*ehdr;
72     vm_offset_t			modulep, kernend;
73     int				err;
74     int				i;
75 
76     if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
77 	return(EFTYPE);
78     ehdr = (Elf_Ehdr *)&(md->md_data);
79 
80     err = bi_load64(fp->f_args, &modulep, &kernend, 1);
81     if (err != 0)
82 	return(err);
83 
84     bzero(PT4, PAGE_SIZE);
85     bzero(PT3, PAGE_SIZE);
86     bzero(PT2, PAGE_SIZE);
87 
88     /*
89      * This is kinda brutal, but every single 1GB VM memory segment points to
90      * the same first 1GB of physical memory.  But it is more than adequate.
91      */
92     for (i = 0; i < 512; i++) {
93 	/* Each slot of the level 4 pages points to the same level 3 page */
94 	PT4[i] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
95 	PT4[i] |= PG_V | PG_RW;
96 
97 	/* Each slot of the level 3 pages points to the same level 2 page */
98 	PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
99 	PT3[i] |= PG_V | PG_RW;
100 
101 	/* The level 2 page slots are mapped with 2MB pages for 1GB. */
102 	PT2[i] = i * (2 * 1024 * 1024);
103 	PT2[i] |= PG_V | PG_RW | PG_PS;
104     }
105 
106     entry_lo = ehdr->e_entry & 0xffffffff;
107     entry_hi = (ehdr->e_entry >> 32) & 0xffffffff;
108 #ifdef DEBUG
109     printf("Start @ %#llx ...\n", ehdr->e_entry);
110 #endif
111 
112     dev_cleanup();
113     __exec((void *)VTOP(amd64_tramp), modulep, kernend);
114 
115     panic("exec returned");
116 }
117 
118 static int
elf64_obj_exec(struct preloaded_file * fp)119 elf64_obj_exec(struct preloaded_file *fp)
120 {
121 	return (EFTYPE);
122 }
123