linux_exec_aout.c revision 1.65
1 /* $NetBSD: linux_exec_aout.c,v 1.65 2008/04/28 20:23:43 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas, Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * based on exec_aout.c, sunos_exec.c and svr4_exec.c 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: linux_exec_aout.c,v 1.65 2008/04/28 20:23:43 martin Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/proc.h> 43 #include <sys/malloc.h> 44 #include <sys/namei.h> 45 #include <sys/vnode.h> 46 #include <sys/mount.h> 47 #include <sys/exec.h> 48 #include <sys/exec_elf.h> 49 50 #include <sys/mman.h> 51 #include <sys/syscallargs.h> 52 53 #include <sys/cpu.h> 54 #include <machine/reg.h> 55 56 #include <compat/linux/common/linux_types.h> 57 #include <compat/linux/common/linux_signal.h> 58 #include <compat/linux/common/linux_util.h> 59 #include <compat/linux/common/linux_exec.h> 60 #include <compat/linux/common/linux_machdep.h> 61 62 #include <compat/linux/linux_syscallargs.h> 63 #include <compat/linux/linux_syscall.h> 64 65 int linux_aout_copyargs(struct lwp *, struct exec_package *, 66 struct ps_strings *, char **, void *); 67 68 static int exec_linux_aout_prep_zmagic(struct lwp *, 69 struct exec_package *); 70 static int exec_linux_aout_prep_nmagic(struct lwp *, 71 struct exec_package *); 72 static int exec_linux_aout_prep_omagic(struct lwp *, 73 struct exec_package *); 74 static int exec_linux_aout_prep_qmagic(struct lwp *, 75 struct exec_package *); 76 77 int 78 linux_aout_copyargs(struct lwp *l, struct exec_package *pack, 79 struct ps_strings *arginfo, char **stackp, void *argp) 80 { 81 char **cpp = (char **)*stackp; 82 char **stk = (char **)*stackp; 83 char *dp, *sp; 84 size_t len; 85 void *nullp = NULL; 86 int argc = arginfo->ps_nargvstr; 87 int envc = arginfo->ps_nenvstr; 88 int error; 89 90 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 91 return error; 92 93 /* leave room for envp and argv */ 94 cpp += 2; 95 if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0) 96 return error; 97 98 dp = (char *) (cpp + argc + envc + 2); 99 sp = argp; 100 101 /* XXX don't copy them out, remap them! */ 102 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 103 104 for (; --argc >= 0; sp += len, dp += len) 105 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 106 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 107 return error; 108 109 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 110 return error; 111 112 if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0) 113 return error; 114 115 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 116 117 for (; --envc >= 0; sp += len, dp += len) 118 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 119 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 120 return error; 121 122 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 123 return error; 124 125 *stackp = (char *)cpp; 126 return 0; 127 } 128 129 int 130 exec_linux_aout_makecmds(struct lwp *l, struct exec_package *epp) 131 { 132 struct exec *linux_ep = epp->ep_hdr; 133 int machtype, magic; 134 int error = ENOEXEC; 135 136 magic = LINUX_N_MAGIC(linux_ep); 137 machtype = LINUX_N_MACHTYPE(linux_ep); 138 139 140 if (machtype != LINUX_MID_MACHINE) 141 return (ENOEXEC); 142 143 switch (magic) { 144 case QMAGIC: 145 error = exec_linux_aout_prep_qmagic(l, epp); 146 break; 147 case ZMAGIC: 148 error = exec_linux_aout_prep_zmagic(l, epp); 149 break; 150 case NMAGIC: 151 error = exec_linux_aout_prep_nmagic(l, epp); 152 break; 153 case OMAGIC: 154 error = exec_linux_aout_prep_omagic(l, epp); 155 break; 156 } 157 return error; 158 } 159 160 /* 161 * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 162 * is very likely not page aligned on most architectures, it is treated 163 * as an NMAGIC here. XXX 164 */ 165 166 static int 167 exec_linux_aout_prep_zmagic(struct lwp *l, struct exec_package *epp) 168 { 169 struct exec *execp = epp->ep_hdr; 170 171 epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); 172 epp->ep_tsize = execp->a_text; 173 epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); 174 epp->ep_dsize = execp->a_data + execp->a_bss; 175 epp->ep_entry = execp->a_entry; 176 177 /* set up command for text segment */ 178 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 179 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), 180 VM_PROT_READ|VM_PROT_EXECUTE); 181 182 /* set up command for data segment */ 183 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 184 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), 185 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 186 187 /* set up command for bss segment */ 188 if (execp->a_bss) 189 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 190 epp->ep_daddr + execp->a_data, NULLVP, 0, 191 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 192 193 return (*epp->ep_esch->es_setup_stack)(l, epp); 194 } 195 196 /* 197 * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. 198 * Not different from the normal stuff. 199 */ 200 201 static int 202 exec_linux_aout_prep_nmagic(struct lwp *l, struct exec_package *epp) 203 { 204 struct exec *execp = epp->ep_hdr; 205 long bsize, baddr; 206 207 epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); 208 epp->ep_tsize = execp->a_text; 209 epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); 210 epp->ep_dsize = execp->a_data + execp->a_bss; 211 epp->ep_entry = execp->a_entry; 212 213 /* set up command for text segment */ 214 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 215 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), 216 VM_PROT_READ|VM_PROT_EXECUTE); 217 218 /* set up command for data segment */ 219 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 220 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), 221 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 222 223 /* set up command for bss segment */ 224 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 225 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 226 if (bsize > 0) 227 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 228 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 229 230 return (*epp->ep_esch->es_setup_stack)(l, epp); 231 } 232 233 /* 234 * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. 235 * Business as usual. 236 */ 237 238 static int 239 exec_linux_aout_prep_omagic(struct lwp *l, struct exec_package *epp) 240 { 241 struct exec *execp = epp->ep_hdr; 242 long dsize, bsize, baddr; 243 244 epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); 245 epp->ep_tsize = execp->a_text; 246 epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); 247 epp->ep_dsize = execp->a_data + execp->a_bss; 248 epp->ep_entry = execp->a_entry; 249 250 /* set up command for text and data segments */ 251 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 252 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 253 LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 254 255 /* set up command for bss segment */ 256 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 257 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 258 if (bsize > 0) 259 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 260 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 261 262 /* 263 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 264 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 265 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 266 * respectively to page boundaries. 267 * Compensate `ep_dsize' for the amount of data covered by the last 268 * text page. 269 */ 270 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 271 PAGE_SIZE); 272 epp->ep_dsize = (dsize > 0) ? dsize : 0; 273 return (*epp->ep_esch->es_setup_stack)(l, epp); 274 } 275 276 static int 277 exec_linux_aout_prep_qmagic(struct lwp *l, struct exec_package *epp) 278 { 279 struct exec *execp = epp->ep_hdr; 280 int error; 281 282 epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); 283 epp->ep_tsize = execp->a_text; 284 epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); 285 epp->ep_dsize = execp->a_data + execp->a_bss; 286 epp->ep_entry = execp->a_entry; 287 288 error = vn_marktext(epp->ep_vp); 289 if (error) 290 return (error); 291 292 /* set up command for text segment */ 293 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 294 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), 295 VM_PROT_READ|VM_PROT_EXECUTE); 296 297 /* set up command for data segment */ 298 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 299 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), 300 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 301 302 /* set up command for bss segment */ 303 if (execp->a_bss) 304 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 305 epp->ep_daddr + execp->a_data, NULLVP, 0, 306 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 307 308 return (*epp->ep_esch->es_setup_stack)(l, epp); 309 } 310
Indexes created Tue Sep 23 14:10:03 GMT 2025