elf32_freebsd.c revision 39833
139833Speter/*- 239833Speter * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 339833Speter * All rights reserved. 439833Speter * 539833Speter * Redistribution and use in source and binary forms, with or without 639833Speter * modification, are permitted provided that the following conditions 739833Speter * are met: 839833Speter * 1. Redistributions of source code must retain the above copyright 939833Speter * notice, this list of conditions and the following disclaimer. 1039833Speter * 2. Redistributions in binary form must reproduce the above copyright 1139833Speter * notice, this list of conditions and the following disclaimer in the 1239833Speter * documentation and/or other materials provided with the distribution. 1339833Speter * 1439833Speter * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1539833Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1639833Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1739833Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1839833Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1939833Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2039833Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2139833Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2239833Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2339833Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2439833Speter * SUCH DAMAGE. 2539833Speter * 2639833Speter * $Id: aout_freebsd.c,v 1.6 1998/09/29 09:11:49 peter Exp $ 2739833Speter */ 2839833Speter 2939833Speter#include <sys/param.h> 3039833Speter#include <sys/exec.h> 3139833Speter#include <sys/reboot.h> 3239833Speter#include <sys/linker.h> 3339833Speter#include <string.h> 3439833Speter#include <machine/bootinfo.h> 3539833Speter#include <machine/elf.h> 3639833Speter#include <stand.h> 3739833Speter 3839833Speter#include "bootstrap.h" 3939833Speter#include "libi386.h" 4039833Speter#include "btxv86.h" 4139833Speter 4239833Speterstatic int elf_exec(struct loaded_module *amp); 4339833Speter 4439833Speterstruct module_format i386_elf = { elf_loadmodule, elf_exec }; 4539833Speter 4639833Speterstatic struct bootinfo bi; 4739833Speter 4839833Speter/* 4939833Speter * There is an a.out kernel and one or more a.out modules loaded. 5039833Speter * We wish to start executing the kernel image, so make such 5139833Speter * preparations as are required, and do so. 5239833Speter */ 5339833Speterstatic int 5439833Speterelf_exec(struct loaded_module *mp) 5539833Speter{ 5639833Speter struct loaded_module *xp; 5739833Speter struct i386_devdesc *currdev; 5839833Speter struct module_metadata *md; 5939833Speter Elf_Ehdr *ehdr; 6039833Speter u_int32_t argv[6]; /* kernel arguments */ 6139833Speter int major, bootdevnr; 6239833Speter vm_offset_t addr, entry; 6339833Speter u_int pad; 6439833Speter 6539833Speter if ((md = mod_findmetadata(mp, MODINFOMD_ELFHDR)) == NULL) 6639833Speter return(EFTYPE); /* XXX actually EFUCKUP */ 6739833Speter ehdr = (Elf_Ehdr *)&(md->md_data); 6839833Speter 6939833Speter /* Boot from whatever the current device is */ 7039833Speter i386_getdev((void **)(&currdev), NULL, NULL); 7139833Speter switch(currdev->d_type) { 7239833Speter case DEVT_DISK: 7339833Speter major = 0; /* XXX work out the best possible major here */ 7439833Speter bootdevnr = MAKEBOOTDEV(major, 7539833Speter currdev->d_kind.biosdisk.slice >> 4, 7639833Speter currdev->d_kind.biosdisk.slice & 0xf, 7739833Speter currdev->d_kind.biosdisk.unit, 7839833Speter currdev->d_kind.biosdisk.partition); 7939833Speter break; 8039833Speter default: 8139833Speter printf("elf_exec: WARNING - don't know how to boot from device type %d\n", currdev->d_type); 8239833Speter } 8339833Speter free(currdev); 8439833Speter 8539833Speter /* legacy bootinfo structure */ 8639833Speter bi.bi_version = BOOTINFO_VERSION; 8739833Speter bi.bi_kernelname = 0; /* XXX char * -> kernel name */ 8839833Speter bi.bi_nfs_diskless = 0; /* struct nfs_diskless * */ 8939833Speter bi.bi_n_bios_used = 0; /* XXX would have to hook biosdisk driver for these */ 9039833Speter /* bi.bi_bios_geom[] */ 9139833Speter bi.bi_size = sizeof(bi); 9239833Speter bi.bi_memsizes_valid = 1; 9339833Speter bi.bi_vesa = 0; /* XXX correct value? */ 9439833Speter bi.bi_basemem = getbasemem(); 9539833Speter bi.bi_extmem = getextmem(); 9639833Speter bi.bi_symtab = 0; /* Let kld use _DYNAMIC */ 9739833Speter bi.bi_esymtab = 0; 9839833Speter 9939833Speter /* Device data is kept in the kernel argv array */ 10039833Speter argv[0] = bi_getboothowto(mp->m_args); /* boothowto */ 10139833Speter argv[1] = bootdevnr; /* bootdev */ 10239833Speter argv[2] = 0; /* old cyloffset */ 10339833Speter argv[3] = 0; /* old esym */ 10439833Speter argv[4] = 0; /* "new" bootinfo magic */ 10539833Speter argv[5] = 0; /* physical addr of bootinfo */ 10639833Speter 10739833Speter /* find the last module in the chain */ 10839833Speter for (xp = mp; xp->m_next != NULL; xp = xp->m_next) 10939833Speter ; 11039833Speter addr = xp->m_addr + xp->m_size; 11139833Speter /* pad to a page boundary */ 11239833Speter pad = (u_int)addr & PAGE_MASK; 11339833Speter if (pad != 0) { 11439833Speter pad = PAGE_SIZE - pad; 11539833Speter addr += pad; 11639833Speter } 11739833Speter /* copy our environment */ 11839833Speter bi.bi_envp = addr; 11939833Speter addr = bi_copyenv(addr); 12039833Speter 12139833Speter /* 12239833Speter * Note, we could move the following onto a seperate page for reclaiming, 12339833Speter * but the environment is so small and so is this. 12439833Speter */ 12539833Speter 12639833Speter /* pad to a 4-byte boundary */ 12739833Speter addr = (addr + 0x3) & ~0x3; 12839833Speter 12939833Speter /* leave space for bootinfo */ 13039833Speter argv[5] = (u_int32_t)addr; 13139833Speter addr += sizeof(struct bootinfo); 13239833Speter 13339833Speter /* pad to a 4-byte boundary */ 13439833Speter addr = (addr + 0x3) & ~0x3; 13539833Speter 13639833Speter /* save in kernel name */ 13739833Speter bi.bi_kernelname = addr; 13839833Speter i386_copyin(mp->m_name, addr, strlen(mp->m_name) + 1); 13939833Speter addr += strlen(mp->m_name) + 1; 14039833Speter 14139833Speter /* pad to a page boundary */ 14239833Speter pad = (u_int)addr & PAGE_MASK; 14339833Speter if (pad != 0) { 14439833Speter pad = PAGE_SIZE - pad; 14539833Speter addr += pad; 14639833Speter } 14739833Speter /* copy module list and metadata */ 14839833Speter bi.bi_modulep = addr; 14939833Speter addr = bi_copymodules(addr); 15039833Speter 15139833Speter /* all done copying stuff in, save end of loaded object space */ 15239833Speter bi.bi_kernend = addr; 15339833Speter 15439833Speter /* and insert bootinfo struct into reserved spot */ 15539833Speter i386_copyin(&bi, (vm_offset_t)argv[5], sizeof(bi)); 15639833Speter argv[0] |= RB_BOOTINFO; /* it's there now */ 15739833Speter 15839833Speter entry = ehdr->e_entry & 0xffffff; 15939833Speter 16039833Speter#ifdef DEBUG 16139833Speter { 16239833Speter int i; 16339833Speter for (i = 0; i < 6; i++) 16439833Speter printf("argv[%d]=%lx\n", i, argv[i]); 16539833Speter } 16639833Speter 16739833Speter printf("Start @ 0x%lx ...\n", entry); 16839833Speter#endif 16939833Speter 17039833Speter __exec((void *)entry, argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]); 17139833Speter 17239833Speter panic("exec returned"); 17339833Speter} 174