elf64_freebsd.c revision 114379
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 * $FreeBSD: head/sys/boot/i386/libi386/elf64_freebsd.c 114379 2003-05-01 03:56:30Z peter $ 27 */ 28 29#define __ELF_WORD_SIZE 64 30#include <sys/param.h> 31#include <sys/exec.h> 32#include <sys/linker.h> 33#include <string.h> 34#include <machine/bootinfo.h> 35#include <machine/elf.h> 36#include <stand.h> 37 38#include "bootstrap.h" 39#include "libi386.h" 40#include "btxv86.h" 41 42static int elf64_exec(struct preloaded_file *amp); 43 44struct file_format amd64_elf = { elf64_loadfile, elf64_exec }; 45 46#define PG_V 0x001 47#define PG_RW 0x002 48#define PG_U 0x004 49#define PG_PS 0x080 50 51typedef u_int64_t p4_entry_t; 52typedef u_int64_t p3_entry_t; 53typedef u_int64_t p2_entry_t; 54extern p4_entry_t PT4[]; 55extern p3_entry_t PT3[]; 56extern p2_entry_t PT2[]; 57 58u_int32_t entry_hi; 59u_int32_t entry_lo; 60 61extern amd64_tramp(); 62 63/* 64 * There is an a.out kernel and one or more a.out modules loaded. 65 * We wish to start executing the kernel image, so make such 66 * preparations as are required, and do so. 67 */ 68static int 69elf64_exec(struct preloaded_file *fp) 70{ 71 struct file_metadata *md; 72 Elf_Ehdr *ehdr; 73 vm_offset_t modulep, kernend; 74 int err; 75 int i; 76 77 if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL) 78 return(EFTYPE); /* XXX actually EFUCKUP */ 79 ehdr = (Elf_Ehdr *)&(md->md_data); 80 81 err = bi_load64(fp->f_args, &modulep, &kernend); 82 if (err != 0) 83 return(err); 84 85 bzero(PT4, PAGE_SIZE); 86 bzero(PT3, PAGE_SIZE); 87 bzero(PT2, PAGE_SIZE); 88 89 /* single PML4 entry */ 90 PT4[0] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]); 91 PT4[0] |= PG_V | PG_RW | PG_U; 92 93 /* Direct map 1GB at address zero */ 94 PT3[0] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]); 95 PT3[0] |= PG_V | PG_RW | PG_U; 96 97 /* Direct map 1GB at KERNBASE (hardcoded for now) */ 98 PT3[1] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]); 99 PT3[1] |= PG_V | PG_RW | PG_U; 100 101 /* 512 PG_PS (2MB) page mappings for 1GB of direct mapping */ 102 for (i = 0; i < 512; i++) { 103 PT2[i] = i * (2 * 1024 * 1024); 104 PT2[i] |= PG_V | PG_RW | PG_PS | PG_U; 105 } 106 107 entry_lo = ehdr->e_entry & 0xffffffff; 108 entry_hi = (ehdr->e_entry >> 32) & 0xffffffff; 109#ifdef DEBUG 110 printf("Start @ %#llx ...\n", ehdr->e_entry); 111#endif 112 113 dev_cleanup(); 114 __exec((void *)VTOP(amd64_tramp), modulep, kernend); 115 116 panic("exec returned"); 117} 118