linux_exec_aout.c revision 1.55
1 /* $NetBSD: linux_exec_aout.c,v 1.55 2003/08/08 18:57:06 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 1.55 2003/08/08 18:57:06 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 proc *, struct exec_package *, 74 struct ps_strings *, char **, void *)); 75 76 static int exec_linux_aout_prep_zmagic __P((struct proc *, 77 struct exec_package *)); 78 static int exec_linux_aout_prep_nmagic __P((struct proc *, 79 struct exec_package *)); 80 static int exec_linux_aout_prep_omagic __P((struct proc *, 81 struct exec_package *)); 82 static int exec_linux_aout_prep_qmagic __P((struct proc *, 83 struct exec_package *)); 84 85 int 86 linux_aout_copyargs(p, pack, arginfo, stackp, argp) 87 struct proc *p; 88 struct exec_package *pack; 89 struct ps_strings *arginfo; 90 char **stackp; 91 void *argp; 92 { 93 char **cpp = (char **)*stackp; 94 char **stk = (char **)*stackp; 95 char *dp, *sp; 96 size_t len; 97 void *nullp = NULL; 98 int argc = arginfo->ps_nargvstr; 99 int envc = arginfo->ps_nenvstr; 100 int error; 101 102 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 103 return error; 104 105 /* leave room for envp and argv */ 106 cpp += 2; 107 if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0) 108 return error; 109 110 dp = (char *) (cpp + argc + envc + 2); 111 sp = argp; 112 113 /* XXX don't copy them out, remap them! */ 114 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 115 116 for (; --argc >= 0; sp += len, dp += len) 117 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 118 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 119 return error; 120 121 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 122 return error; 123 124 if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0) 125 return error; 126 127 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 128 129 for (; --envc >= 0; sp += len, dp += len) 130 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 131 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 132 return error; 133 134 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 135 return error; 136 137 *stackp = (char *)cpp; 138 return 0; 139 } 140 141 int 142 exec_linux_aout_makecmds(p, epp) 143 struct proc *p; 144 struct exec_package *epp; 145 { 146 struct exec *linux_ep = epp->ep_hdr; 147 int machtype, magic; 148 int error = ENOEXEC; 149 150 magic = LINUX_N_MAGIC(linux_ep); 151 machtype = LINUX_N_MACHTYPE(linux_ep); 152 153 154 if (machtype != LINUX_MID_MACHINE) 155 return (ENOEXEC); 156 157 switch (magic) { 158 case QMAGIC: 159 error = exec_linux_aout_prep_qmagic(p, epp); 160 break; 161 case ZMAGIC: 162 error = exec_linux_aout_prep_zmagic(p, epp); 163 break; 164 case NMAGIC: 165 error = exec_linux_aout_prep_nmagic(p, epp); 166 break; 167 case OMAGIC: 168 error = exec_linux_aout_prep_omagic(p, epp); 169 break; 170 } 171 return error; 172 } 173 174 /* 175 * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 176 * is very likely not page aligned on most architectures, it is treated 177 * as an NMAGIC here. XXX 178 */ 179 180 static int 181 exec_linux_aout_prep_zmagic(p, epp) 182 struct proc *p; 183 struct exec_package *epp; 184 { 185 struct exec *execp = epp->ep_hdr; 186 187 epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); 188 epp->ep_tsize = execp->a_text; 189 epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); 190 epp->ep_dsize = execp->a_data + execp->a_bss; 191 epp->ep_entry = execp->a_entry; 192 193 /* set up command for text segment */ 194 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 195 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), 196 VM_PROT_READ|VM_PROT_EXECUTE); 197 198 /* set up command for data segment */ 199 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 200 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), 201 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 202 203 /* set up command for bss segment */ 204 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 205 epp->ep_daddr + execp->a_data, NULLVP, 0, 206 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 207 208 return (*epp->ep_esch->es_setup_stack)(p, epp); 209 } 210 211 /* 212 * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. 213 * Not different from the normal stuff. 214 */ 215 216 static int 217 exec_linux_aout_prep_nmagic(p, epp) 218 struct proc *p; 219 struct exec_package *epp; 220 { 221 struct exec *execp = epp->ep_hdr; 222 long bsize, baddr; 223 224 epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); 225 epp->ep_tsize = execp->a_text; 226 epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); 227 epp->ep_dsize = execp->a_data + execp->a_bss; 228 epp->ep_entry = execp->a_entry; 229 230 /* set up command for text segment */ 231 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 232 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), 233 VM_PROT_READ|VM_PROT_EXECUTE); 234 235 /* set up command for data segment */ 236 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 237 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), 238 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 239 240 /* set up command for bss segment */ 241 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 242 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 243 if (bsize > 0) 244 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 245 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 246 247 return (*epp->ep_esch->es_setup_stack)(p, epp); 248 } 249 250 /* 251 * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. 252 * Business as usual. 253 */ 254 255 static int 256 exec_linux_aout_prep_omagic(p, epp) 257 struct proc *p; 258 struct exec_package *epp; 259 { 260 struct exec *execp = epp->ep_hdr; 261 long dsize, bsize, baddr; 262 263 epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); 264 epp->ep_tsize = execp->a_text; 265 epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); 266 epp->ep_dsize = execp->a_data + execp->a_bss; 267 epp->ep_entry = execp->a_entry; 268 269 /* set up command for text and data segments */ 270 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 271 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 272 LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 273 274 /* set up command for bss segment */ 275 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 276 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 277 if (bsize > 0) 278 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 279 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 280 281 /* 282 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 283 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 284 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 285 * respectively to page boundaries. 286 * Compensate `ep_dsize' for the amount of data covered by the last 287 * text page. 288 */ 289 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 290 PAGE_SIZE); 291 epp->ep_dsize = (dsize > 0) ? dsize : 0; 292 return (*epp->ep_esch->es_setup_stack)(p, epp); 293 } 294 295 static int 296 exec_linux_aout_prep_qmagic(p, epp) 297 struct proc *p; 298 struct exec_package *epp; 299 { 300 struct exec *execp = epp->ep_hdr; 301 int error; 302 303 epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); 304 epp->ep_tsize = execp->a_text; 305 epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); 306 epp->ep_dsize = execp->a_data + execp->a_bss; 307 epp->ep_entry = execp->a_entry; 308 309 error = vn_marktext(epp->ep_vp); 310 if (error) 311 return (error); 312 313 /* set up command for text segment */ 314 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 315 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), 316 VM_PROT_READ|VM_PROT_EXECUTE); 317 318 /* set up command for data segment */ 319 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 320 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), 321 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 322 323 /* set up command for bss segment */ 324 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 325 epp->ep_daddr + execp->a_data, NULLVP, 0, 326 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 327 328 return (*epp->ep_esch->es_setup_stack)(p, epp); 329 } 330
Indexes created Tue Sep 23 14:10:03 GMT 2025