1 /* $NetBSD: exec_elf32.c,v 1.1 1996/10/04 00:18:57 cgd Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christopher G. Demetriou 17 * for the NetBSD Project. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static char *rcsid = "$NetBSD: exec_elf32.c,v 1.1 1996/10/04 00:18:57 cgd Exp $"; 35 #endif /* not lint */ 36 37 #ifndef ELFSIZE 38 #define ELFSIZE 32 39 #endif 40 41 #include <sys/types.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include "extern.h" 45 46 #if defined(NLIST_ELF32) || defined(NLIST_ELF64) 47 #include <sys/exec_elf.h> 48 #endif 49 50 #if (defined(NLIST_ELF32) && (ELFSIZE == 32)) || \ 51 (defined(NLIST_ELF64) && (ELFSIZE == 64)) 52 53 #define CONCAT(x,y) __CONCAT(x,y) 54 #define ELFNAME(x) CONCAT(elf,CONCAT(ELFSIZE,CONCAT(_,x))) 55 #define ELFNAME2(x,y) CONCAT(x,CONCAT(_elf,CONCAT(ELFSIZE,CONCAT(_,y)))) 56 #define ELFNAMEEND(x) CONCAT(x,CONCAT(_elf,ELFSIZE)) 57 #define ELFDEFNNAME(x) CONCAT(ELF,CONCAT(ELFSIZE,CONCAT(_,x))) 58 59 #define check(off, size) ((off < 0) || (off + size > mappedsize)) 60 #define BAD do { rv = -1; goto out; } while (0) 61 62 int 63 ELFNAMEEND(check)(mappedfile, mappedsize) 64 const char *mappedfile; 65 size_t mappedsize; 66 { 67 Elf_Ehdr *ehdrp; 68 int rv; 69 70 rv = 0; 71 72 if (check(0, sizeof *ehdrp)) 73 BAD; 74 ehdrp = (Elf_Ehdr *)&mappedfile[0]; 75 76 if (memcmp(ehdrp->e_ident, Elf_e_ident, Elf_e_siz)) 77 BAD; 78 79 switch (ehdrp->e_machine) { 80 ELFDEFNNAME(MACHDEP_ID_CASES) 81 82 default: 83 BAD; 84 } 85 86 out: 87 return (rv); 88 } 89 90 int 91 ELFNAMEEND(findoff)(mappedfile, mappedsize, vmaddr, fileoffp) 92 const char *mappedfile; 93 size_t mappedsize, *fileoffp; 94 u_long vmaddr; 95 { 96 Elf_Ehdr *ehdrp; 97 Elf_Shdr *shdrp; 98 Elf_Off shdr_off; 99 Elf_Word shdr_size; 100 #if (ELFSIZE == 32) 101 Elf32_Half nshdr, i; 102 #elif (ELFSIZE == 64) 103 Elf64_Half nshdr, i; 104 #endif 105 int rv; 106 107 rv = 0; 108 109 ehdrp = (Elf_Ehdr *)&mappedfile[0]; 110 nshdr = ehdrp->e_shnum; 111 shdr_off = ehdrp->e_shoff; 112 shdr_size = ehdrp->e_shentsize * nshdr; 113 114 if (check(shdr_off, shdr_size) || 115 (sizeof *shdrp != ehdrp->e_shentsize)) 116 BAD; 117 shdrp = (Elf_Shdr *)&mappedfile[shdr_off]; 118 119 for (i = 0; i < nshdr; i++) { 120 if (shdrp[i].sh_addr <= vmaddr && 121 vmaddr < (shdrp[i].sh_addr + shdrp[i].sh_size)) { 122 *fileoffp = vmaddr - 123 shdrp[i].sh_addr + shdrp[i].sh_offset; 124 break; 125 } 126 } 127 if (i == nshdr) 128 BAD; 129 130 out: 131 return (rv); 132 } 133 134 #endif /* include this size of ELF */ 135