1 /* $NetBSD: exec_elf32.c,v 1.144 2024/12/06 16:19:41 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Christopher G. Demetriou 18 * for the NetBSD Project. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: exec_elf32.c,v 1.144 2024/12/06 16:19:41 riastradh Exp $"); 36 37 #define ELFSIZE 32 38 39 #include "exec_elf.c" 40 41 #include <sys/module.h> 42 43 #define ELF32_AUXSIZE (ELF_AUX_ENTRIES * sizeof(Aux32Info) \ 44 + MAXPATHLEN + ALIGN(1)) 45 46 MODULE(MODULE_CLASS_EXEC, exec_elf32, NULL); 47 48 static struct execsw exec_elf32_execsw[] = { 49 { 50 .es_hdrsz = sizeof (Elf32_Ehdr), 51 .es_makecmds = exec_elf32_makecmds, 52 .u = { 53 .elf_probe_func = netbsd_elf32_probe, 54 }, 55 .es_emul = &emul_netbsd, 56 .es_prio = EXECSW_PRIO_FIRST, 57 .es_arglen = ELF32_AUXSIZE, 58 .es_copyargs = elf32_copyargs, 59 .es_setregs = NULL, 60 .es_coredump = coredump_elf32, 61 .es_setup_stack = exec_setup_stack, 62 }, 63 #if EXEC_ELF_NOTELESS 64 { 65 .es_hdrsz = sizeof (Elf32_Ehdr), 66 .es_makecmds = exec_elf32_makecmds, 67 .u { 68 elf_probe_func = NULL, 69 }, 70 .es_emul = &emul_netbsd, 71 .es_prio = EXECSW_PRIO_LAST, 72 .es_arglen = ELF32_AUXSIZE, 73 .es_copyargs = elf32_copyargs, 74 .es_setregs = NULL, 75 .es_coredump = coredump_elf32, 76 .es_setup_stack = exec_setup_stack, 77 }, 78 #endif 79 }; 80 81 static int 82 exec_elf32_modcmd(modcmd_t cmd, void *arg) 83 { 84 #if ARCH_ELFSIZE == 64 85 /* 86 * If we are on a 64bit system, we don't want the 32bit execsw[] to be 87 * added in the global array, because the exec_elf32 module only works 88 * on 32bit systems. 89 * 90 * However, we need the exec_elf32 module, because it will make the 32bit 91 * functions available for netbsd32 and linux32. 92 * 93 * Therefore, allow this module on 64bit systems, but make it dormant. 94 */ 95 96 (void)exec_elf32_execsw; /* unused */ 97 98 switch (cmd) { 99 case MODULE_CMD_INIT: 100 case MODULE_CMD_FINI: 101 return 0; 102 default: 103 return SET_ERROR(ENOTTY); 104 } 105 #else /* ARCH_ELFSIZE == 64 */ 106 switch (cmd) { 107 case MODULE_CMD_INIT: 108 return exec_add(exec_elf32_execsw, 109 __arraycount(exec_elf32_execsw)); 110 111 case MODULE_CMD_FINI: 112 return exec_remove(exec_elf32_execsw, 113 __arraycount(exec_elf32_execsw)); 114 115 default: 116 return SET_ERROR(ENOTTY); 117 } 118 #endif /* ARCH_ELFSIZE == 64 */ 119 } 120