linux_exec_aout.c revision 1.60
1 /* $NetBSD: linux_exec_aout.c,v 1.60 2006/11/16 01:32:42 christos 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * based on exec_aout.c, sunos_exec.c and svr4_exec.c 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: linux_exec_aout.c,v 1.60 2006/11/16 01:32:42 christos Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/proc.h> 50 #include <sys/malloc.h> 51 #include <sys/namei.h> 52 #include <sys/vnode.h> 53 #include <sys/mount.h> 54 #include <sys/exec.h> 55 #include <sys/exec_elf.h> 56 57 #include <sys/mman.h> 58 #include <sys/sa.h> 59 #include <sys/syscallargs.h> 60 61 #include <machine/cpu.h> 62 #include <machine/reg.h> 63 64 #include <compat/linux/common/linux_types.h> 65 #include <compat/linux/common/linux_signal.h> 66 #include <compat/linux/common/linux_util.h> 67 #include <compat/linux/common/linux_exec.h> 68 #include <compat/linux/common/linux_machdep.h> 69 70 #include <compat/linux/linux_syscallargs.h> 71 #include <compat/linux/linux_syscall.h> 72 73 int linux_aout_copyargs __P((struct lwp *, struct exec_package *, 74 struct ps_strings *, char **, void *)); 75 76 static int exec_linux_aout_prep_zmagic __P((struct lwp *, 77 struct exec_package *)); 78 static int exec_linux_aout_prep_nmagic __P((struct lwp *, 79 struct exec_package *)); 80 static int exec_linux_aout_prep_omagic __P((struct lwp *, 81 struct exec_package *)); 82 static int exec_linux_aout_prep_qmagic __P((struct lwp *, 83 struct exec_package *)); 84 85 int 86 linux_aout_copyargs(struct lwp *l, struct exec_package *pack, 87 struct ps_strings *arginfo, char **stackp, void *argp) 88 { 89 char **cpp = (char **)*stackp; 90 char **stk = (char **)*stackp; 91 char *dp, *sp; 92 size_t len; 93 void *nullp = NULL; 94 int argc = arginfo->ps_nargvstr; 95 int envc = arginfo->ps_nenvstr; 96 int error; 97 98 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 99 return error; 100 101 /* leave room for envp and argv */ 102 cpp += 2; 103 if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0) 104 return error; 105 106 dp = (char *) (cpp + argc + envc + 2); 107 sp = argp; 108 109 /* XXX don't copy them out, remap them! */ 110 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 111 112 for (; --argc >= 0; sp += len, dp += len) 113 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 114 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 115 return error; 116 117 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 118 return error; 119 120 if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0) 121 return error; 122 123 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 124 125 for (; --envc >= 0; sp += len, dp += len) 126 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 127 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 128 return error; 129 130 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 131 return error; 132 133 *stackp = (char *)cpp; 134 return 0; 135 } 136 137 int 138 exec_linux_aout_makecmds(l, epp) 139 struct lwp *l; 140 struct exec_package *epp; 141 { 142 struct exec *linux_ep = epp->ep_hdr; 143 int machtype, magic; 144 int error = ENOEXEC; 145 146 magic = LINUX_N_MAGIC(linux_ep); 147 machtype = LINUX_N_MACHTYPE(linux_ep); 148 149 150 if (machtype != LINUX_MID_MACHINE) 151 return (ENOEXEC); 152 153 switch (magic) { 154 case QMAGIC: 155 error = exec_linux_aout_prep_qmagic(l, epp); 156 break; 157 case ZMAGIC: 158 error = exec_linux_aout_prep_zmagic(l, epp); 159 break; 160 case NMAGIC: 161 error = exec_linux_aout_prep_nmagic(l, epp); 162 break; 163 case OMAGIC: 164 error = exec_linux_aout_prep_omagic(l, epp); 165 break; 166 } 167 return error; 168 } 169 170 /* 171 * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 172 * is very likely not page aligned on most architectures, it is treated 173 * as an NMAGIC here. XXX 174 */ 175 176 static int 177 exec_linux_aout_prep_zmagic(l, epp) 178 struct lwp *l; 179 struct exec_package *epp; 180 { 181 struct exec *execp = epp->ep_hdr; 182 183 epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); 184 epp->ep_tsize = execp->a_text; 185 epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); 186 epp->ep_dsize = execp->a_data + execp->a_bss; 187 epp->ep_entry = execp->a_entry; 188 189 /* set up command for text segment */ 190 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 191 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), 192 VM_PROT_READ|VM_PROT_EXECUTE); 193 194 /* set up command for data segment */ 195 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 196 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), 197 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 198 199 /* set up command for bss segment */ 200 if (execp->a_bss) 201 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 202 epp->ep_daddr + execp->a_data, NULLVP, 0, 203 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 204 205 return (*epp->ep_esch->es_setup_stack)(l, epp); 206 } 207 208 /* 209 * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. 210 * Not different from the normal stuff. 211 */ 212 213 static int 214 exec_linux_aout_prep_nmagic(l, epp) 215 struct lwp *l; 216 struct exec_package *epp; 217 { 218 struct exec *execp = epp->ep_hdr; 219 long bsize, baddr; 220 221 epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); 222 epp->ep_tsize = execp->a_text; 223 epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); 224 epp->ep_dsize = execp->a_data + execp->a_bss; 225 epp->ep_entry = execp->a_entry; 226 227 /* set up command for text segment */ 228 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 229 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), 230 VM_PROT_READ|VM_PROT_EXECUTE); 231 232 /* set up command for data segment */ 233 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 234 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), 235 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 236 237 /* set up command for bss segment */ 238 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 239 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 240 if (bsize > 0) 241 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 242 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 243 244 return (*epp->ep_esch->es_setup_stack)(l, epp); 245 } 246 247 /* 248 * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. 249 * Business as usual. 250 */ 251 252 static int 253 exec_linux_aout_prep_omagic(l, epp) 254 struct lwp *l; 255 struct exec_package *epp; 256 { 257 struct exec *execp = epp->ep_hdr; 258 long dsize, bsize, baddr; 259 260 epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); 261 epp->ep_tsize = execp->a_text; 262 epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); 263 epp->ep_dsize = execp->a_data + execp->a_bss; 264 epp->ep_entry = execp->a_entry; 265 266 /* set up command for text and data segments */ 267 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 268 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 269 LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 270 271 /* set up command for bss segment */ 272 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 273 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 274 if (bsize > 0) 275 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 276 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 277 278 /* 279 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 280 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 281 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 282 * respectively to page boundaries. 283 * Compensate `ep_dsize' for the amount of data covered by the last 284 * text page. 285 */ 286 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 287 PAGE_SIZE); 288 epp->ep_dsize = (dsize > 0) ? dsize : 0; 289 return (*epp->ep_esch->es_setup_stack)(l, epp); 290 } 291 292 static int 293 exec_linux_aout_prep_qmagic(l, epp) 294 struct lwp *l; 295 struct exec_package *epp; 296 { 297 struct exec *execp = epp->ep_hdr; 298 int error; 299 300 epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); 301 epp->ep_tsize = execp->a_text; 302 epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); 303 epp->ep_dsize = execp->a_data + execp->a_bss; 304 epp->ep_entry = execp->a_entry; 305 306 error = vn_marktext(epp->ep_vp); 307 if (error) 308 return (error); 309 310 /* set up command for text segment */ 311 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 312 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), 313 VM_PROT_READ|VM_PROT_EXECUTE); 314 315 /* set up command for data segment */ 316 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 317 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), 318 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 319 320 /* set up command for bss segment */ 321 if (execp->a_bss) 322 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 323 epp->ep_daddr + execp->a_data, NULLVP, 0, 324 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 325 326 return (*epp->ep_esch->es_setup_stack)(l, epp); 327 } 328
Indexes created Tue Sep 23 20:09:58 GMT 2025