/* $OpenBSD: elf64_exec.c,v 1.4 2013/12/28 21:00:21 kettenis 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)) #include #include #include #include "openfirm.h" 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. */ 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_OPENBSD_RANDOMIZE) { int m, pos; /* Fill segment. */ for (pos = 0; pos < phdr.p_filesz; pos += m) { m = MIN(phdr.p_filesz - pos, sizeof(rnddata)); bcopy(rnddata, (void *)(long)phdr.p_paddr + pos, m); } continue; } 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, PAGE_SIZE); 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, PAGE_SIZE), PAGE_SIZE)) == (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