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/* $OpenBSD: elfXX_exec.c,v 1.8 2010/08/21 17:09:49 jsing Exp $ */
/* $NetBSD: elfXX_exec.c,v 1.2 2001/08/15 20:08:15 eeh Exp $ */
/*
* Copyright (c) 1998-2000 Eduardo Horvath. All rights reserved.
* Copyright (c) 1997 Jason R. Thorpe. All rights reserved.
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* All rights reserved.
*
* ELF support derived from NetBSD/alpha's boot loader, written
* by Christopher G. Demetriou.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* First try for the boot code
*
* Input syntax is:
* [promdev[{:|,}partition]]/[filename] [flags]
*/
#define ELFSIZE 64
#define MB (1024 * 1024)
#define ELF_ALIGN(x) (((x) + 7) & (~7))
int
elf64_exec(int fd, Elf_Ehdr *elf, u_int64_t *entryp, void **ssymp, void **esymp){
Elf_Shdr *shp;
Elf_Off off;
void *addr;
size_t size;
u_int align;
int i, first = 1;
int n;
/*
* Don't display load address for ELF; it's encoded in
* each section.
*/
#ifdef DEBUG
printf("elf%d_exec: ", ELFSIZE);
#endif
printf("Booting %s\n", opened_name);
for (i = 0; i < elf->e_phnum; i++) {
Elf_Phdr phdr;
size = lseek(fd, (size_t)(elf->e_phoff + sizeof(phdr) * i),
SEEK_SET);
if (read(fd, (void *)&phdr, sizeof(phdr)) != sizeof(phdr)) {
printf("read phdr: %s\n", strerror(errno));
return (1);
}
if (phdr.p_type != PT_LOAD ||
(phdr.p_flags & (PF_W|PF_X)) == 0)
continue;
/* Read in segment. */
printf("%s%lu@0x%lx", first ? "" : "+", (u_long)phdr.p_filesz,
(u_long)phdr.p_vaddr);
(void)lseek(fd, (size_t)phdr.p_offset, SEEK_SET);
/*
* If the segment's VA is aligned on a 4MB boundary, align its
* request 4MB aligned physical memory. Otherwise use default
* alignment. Make sure BSS is extended to a 4MB boundary, too.
*/
align = phdr.p_align;
if ((phdr.p_vaddr & (4 * MB - 1)) == 0)
align = 4 * MB;
if (phdr.p_filesz < phdr.p_memsz)
phdr.p_memsz = roundup(phdr.p_memsz, 4 * MB);
phdr.p_memsz = roundup(phdr.p_memsz, NBPG);
if (OF_claim((void *)(long)phdr.p_vaddr, phdr.p_memsz, align) ==
(void *)-1)
panic("cannot claim memory");
if (read(fd, (void *)(long)phdr.p_vaddr, phdr.p_filesz) !=
phdr.p_filesz) {
printf("read segment: %s\n", strerror(errno));
return (1);
}
syncicache((void *)(long)phdr.p_vaddr, phdr.p_filesz);
/* Zero BSS. */
if (phdr.p_filesz < phdr.p_memsz) {
printf("+%lu@0x%lx", (u_long)phdr.p_memsz - phdr.p_filesz,
(u_long)(phdr.p_vaddr + phdr.p_filesz));
bzero((void *)(long)phdr.p_vaddr + phdr.p_filesz,
(size_t)phdr.p_memsz - phdr.p_filesz);
}
first = 0;
}
printf(" \n");
/*
* Compute the size of the symbol table.
*/
size = sizeof(Elf_Ehdr) + (elf->e_shnum * sizeof(Elf_Shdr));
shp = addr = alloc(elf->e_shnum * sizeof(Elf_Shdr));
(void)lseek(fd, (off_t)elf->e_shoff, SEEK_SET);
if (read(fd, addr, (size_t)(elf->e_shnum * sizeof(Elf_Shdr))) !=
elf->e_shnum * sizeof(Elf_Shdr)) {
printf("read section headers: %s\n", strerror(errno));
return (1);
}
for (i = 0; i < elf->e_shnum; i++, shp++) {
if (shp->sh_type == SHT_NULL)
continue;
if (shp->sh_type != SHT_SYMTAB
&& shp->sh_type != SHT_STRTAB) {
shp->sh_offset = 0;
continue;
}
size += shp->sh_size;
}
shp = addr;
/*
* Reserve memory for the symbols.
*/
if ((addr = OF_claim(0, roundup(size, NBPG), NBPG)) == (void *)-1)
panic("no space for symbol table");
/*
* Copy the headers.
*/
elf->e_phoff = 0;
elf->e_shoff = sizeof(Elf_Ehdr);
elf->e_phentsize = 0;
elf->e_phnum = 0;
bcopy(elf, addr, sizeof(Elf_Ehdr));
bcopy(shp, addr + sizeof(Elf_Ehdr), elf->e_shnum * sizeof(Elf_Shdr));
free(shp, elf->e_shnum * sizeof(Elf_Shdr));
*ssymp = addr;
/*
* Now load the symbol sections themselves.
*/
shp = addr + sizeof(Elf_Ehdr);
size = sizeof(Elf_Ehdr) + (elf->e_shnum * sizeof(Elf_Shdr));
size = ELF_ALIGN(size);
addr += size;
off = size;
for (first = 1, i = 0; i < elf->e_shnum; i++, shp++) {
if (shp->sh_type == SHT_SYMTAB
|| shp->sh_type == SHT_STRTAB) {
if (first)
printf("symbols @ 0x%lx ", (u_long)addr);
printf("%s%d", first ? "" : "+", (int)shp->sh_size);
(void)lseek(fd, shp->sh_offset, SEEK_SET);
if (read(fd, addr, shp->sh_size) != shp->sh_size) {
printf("read symbols: %s\n", strerror(errno));
return (1);
}
addr += ELF_ALIGN(shp->sh_size);
shp->sh_offset = off;
off += ELF_ALIGN(shp->sh_size);
first = 0;
}
}
*esymp = addr;
*entryp = elf->e_entry;
return (0);
}
#undef ELF_ALIGN
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