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format modules, which are currently only used on the amd64 platform. This initial implementation just parses enough of the module to allow it to extract dependencies and load all the bits into the right place in memory, so the kernel must still do the full relocation and linking. The details of the loaded sections are passed to the kernel by supplying a copy of the ELF section header table as module metadata with the MODINFOMD_SHDR tag.
127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#define __ELF_WORD_SIZE 64
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/linker.h>
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#include <string.h>
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#include <machine/bootinfo.h>
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#include <machine/elf.h>
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#include <stand.h>
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#include "bootstrap.h"
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#include "libi386.h"
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#include "btxv86.h"
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static int elf64_exec(struct preloaded_file *amp);
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static int elf64_obj_exec(struct preloaded_file *amp);
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struct file_format amd64_elf = { elf64_loadfile, elf64_exec };
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struct file_format amd64_elf_obj = { elf64_obj_loadfile, elf64_obj_exec };
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#define PG_V 0x001
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#define PG_RW 0x002
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#define PG_U 0x004
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#define PG_PS 0x080
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typedef u_int64_t p4_entry_t;
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typedef u_int64_t p3_entry_t;
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typedef u_int64_t p2_entry_t;
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extern p4_entry_t PT4[];
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extern p3_entry_t PT3[];
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extern p2_entry_t PT2[];
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u_int32_t entry_hi;
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u_int32_t entry_lo;
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extern amd64_tramp();
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/*
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* There is an a.out kernel and one or more a.out modules loaded.
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* We wish to start executing the kernel image, so make such
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* preparations as are required, and do so.
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*/
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static int
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elf64_exec(struct preloaded_file *fp)
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{
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struct file_metadata *md;
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Elf_Ehdr *ehdr;
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vm_offset_t modulep, kernend;
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int err;
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int i;
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if ((md = file_findmetadata(fp, MODINFOMD_ELFHDR)) == NULL)
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return(EFTYPE); /* XXX actually EFUCKUP */
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ehdr = (Elf_Ehdr *)&(md->md_data);
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err = bi_load64(fp->f_args, &modulep, &kernend);
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if (err != 0)
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return(err);
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bzero(PT4, PAGE_SIZE);
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bzero(PT3, PAGE_SIZE);
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bzero(PT2, PAGE_SIZE);
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/*
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* This is kinda brutal, but every single 1GB VM memory segment points to
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* the same first 1GB of physical memory. But it is more than adequate.
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*/
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for (i = 0; i < 512; i++) {
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/* Each slot of the level 4 pages points to the same level 3 page */
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PT4[i] = (p4_entry_t)VTOP((uintptr_t)&PT3[0]);
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PT4[i] |= PG_V | PG_RW | PG_U;
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/* Each slot of the level 3 pages points to the same level 2 page */
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PT3[i] = (p3_entry_t)VTOP((uintptr_t)&PT2[0]);
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PT3[i] |= PG_V | PG_RW | PG_U;
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/* The level 2 page slots are mapped with 2MB pages for 1GB. */
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PT2[i] = i * (2 * 1024 * 1024);
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PT2[i] |= PG_V | PG_RW | PG_PS | PG_U;
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}
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entry_lo = ehdr->e_entry & 0xffffffff;
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entry_hi = (ehdr->e_entry >> 32) & 0xffffffff;
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#ifdef DEBUG
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printf("Start @ %#llx ...\n", ehdr->e_entry);
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#endif
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dev_cleanup();
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__exec((void *)VTOP(amd64_tramp), modulep, kernend);
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panic("exec returned");
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}
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static int
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elf64_obj_exec(struct preloaded_file *fp)
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{
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return (EFTYPE);
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}
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