i86pc/dboot/dboot_elfload.c

	dboot_elfload.c revision ae115bc77f6fcde83175c75b4206dc2e50747966
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <sys/inttypes.h>
#include <sys/systm.h>
#include <sys/elf.h>
#include <sys/elf_notes.h>

#include <util/memcpy.h>

#include "dboot_xboot.h"
#include "dboot_elfload.h"
#include "dboot_printf.h"

static caddr_t elf_file = 0;

#define PGETBYTES(offset)   ((void *)(elf_file + (offset)))

static void *
getehdr(void)
{
    uchar_t *ident;
    void *hdr = NULL;

    ident = PGETBYTES(0);
    if (ident == NULL)
        dboot_panic("Cannot read kernel ELF header\n");

    if (ident[EI_MAG0] != ELFMAG0 || ident[EI_MAG1] != ELFMAG1 ||
        ident[EI_MAG2] != ELFMAG2 || ident[EI_MAG3] != ELFMAG3)
        dboot_panic("not an ELF file!\n");

    if (ident[EI_CLASS] == ELFCLASS32)
        hdr = PGETBYTES(0);
    else if (ident[EI_CLASS] == ELFCLASS64)
        hdr = PGETBYTES(0);
    else
        dboot_panic("Unknown ELF class\n");

    return (hdr);
}


/*
 * parse the elf file for program information
 */
int
dboot_elfload64(uintptr_t file_image)
{
    Elf64_Ehdr *eh;
    Elf64_Phdr *phdr;
    caddr_t allphdrs;
    int i;
    paddr_t src;
    paddr_t dst;

    elf_file = (caddr_t)file_image;

    allphdrs = NULL;

    eh = getehdr();
    if (eh == NULL)
        dboot_panic("getehdr() failed\n");

    if (eh->e_type != ET_EXEC)
        dboot_panic("not ET_EXEC, e_type = 0x%x\n", eh->e_type);

    if (eh->e_phnum == 0 || eh->e_phoff == 0)
        dboot_panic("no program headers\n");

    /*
     * Get the program headers.
     */
    allphdrs = PGETBYTES(eh->e_phoff);
    if (allphdrs == NULL)
        dboot_panic("Failed to get program headers e_phnum = %d\n",
            eh->e_phnum);

    /*
     * Next look for interesting program headers.
     */
    for (i = 0; i < eh->e_phnum; i++) {
        /*LINTED [ELF program header alignment]*/
        phdr = (Elf64_Phdr *)(allphdrs + eh->e_phentsize * i);

        /*
         * Dynamically-linked executable.
         * Complain.
         */
        if (phdr->p_type == PT_INTERP) {
            dboot_printf("warning: PT_INTERP section\n");
            continue;
        }

        /*
         * at this point we only care about PT_LOAD segments
         */
        if (phdr->p_type != PT_LOAD)
            continue;

        if (phdr->p_flags == (PF_R | PF_W) && phdr->p_vaddr == 0) {
            dboot_printf("warning: krtld reloc info?\n");
            continue;
        }

        /*
         * If memory size is zero just ignore this header.
         */
        if (phdr->p_memsz == 0)
            continue;

        /*
         * If load address 1:1 then ignore this header.
         */
        if (phdr->p_paddr == phdr->p_vaddr) {
            if (prom_debug)
                dboot_printf("Skipping PT_LOAD segment for "
                    "paddr = 0x%lx\n", (ulong_t)phdr->p_paddr);
            continue;
        }

        /*
         * copy the data to kernel area
         */
        if (phdr->p_paddr != FOUR_MEG && phdr->p_paddr != 2 * FOUR_MEG)
            dboot_panic("Bad paddr for kernel nucleus segment\n");
        src = (uintptr_t)PGETBYTES(phdr->p_offset);
        dst = ktext_phys + phdr->p_paddr - FOUR_MEG;
        if (prom_debug)
            dboot_printf("copying %lu bytes from ELF offset 0x%lx "
                "to physaddr 0x%lx (va=0x%lx)\n",
                (ulong_t)phdr->p_filesz, (ulong_t)phdr->p_offset,
                (ulong_t)dst, (ulong_t)phdr->p_vaddr);
        (void) memcpy((void *)(uintptr_t)dst,
            (void *)(uintptr_t)src, (size_t)phdr->p_filesz);
    }

    /*
     * Ignore the intepreter (or should we die if there is one??)
     */
    return (0);
}