linux_exec_aout.c revision 1.62.2.1
1 /* $NetBSD: linux_exec_aout.c,v 1.62.2.1 2007/12/08 18:18:47 mjf 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 1.62.2.1 2007/12/08 18:18:47 mjf 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/syscallargs.h> 59 60 #include <sys/cpu.h> 61 #include <machine/reg.h> 62 63 #include <compat/linux/common/linux_types.h> 64 #include <compat/linux/common/linux_signal.h> 65 #include <compat/linux/common/linux_util.h> 66 #include <compat/linux/common/linux_exec.h> 67 #include <compat/linux/common/linux_machdep.h> 68 69 #include <compat/linux/linux_syscallargs.h> 70 #include <compat/linux/linux_syscall.h> 71 72 int linux_aout_copyargs(struct lwp *, struct exec_package *, 73 struct ps_strings *, char **, void *); 74 75 static int exec_linux_aout_prep_zmagic(struct lwp *, 76 struct exec_package *); 77 static int exec_linux_aout_prep_nmagic(struct lwp *, 78 struct exec_package *); 79 static int exec_linux_aout_prep_omagic(struct lwp *, 80 struct exec_package *); 81 static int exec_linux_aout_prep_qmagic(struct lwp *, 82 struct exec_package *); 83 84 int 85 linux_aout_copyargs(struct lwp *l, struct exec_package *pack, 86 struct ps_strings *arginfo, char **stackp, void *argp) 87 { 88 char **cpp = (char **)*stackp; 89 char **stk = (char **)*stackp; 90 char *dp, *sp; 91 size_t len; 92 void *nullp = NULL; 93 int argc = arginfo->ps_nargvstr; 94 int envc = arginfo->ps_nenvstr; 95 int error; 96 97 if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) 98 return error; 99 100 /* leave room for envp and argv */ 101 cpp += 2; 102 if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0) 103 return error; 104 105 dp = (char *) (cpp + argc + envc + 2); 106 sp = argp; 107 108 /* XXX don't copy them out, remap them! */ 109 arginfo->ps_argvstr = cpp; /* remember location of argv for later */ 110 111 for (; --argc >= 0; sp += len, dp += len) 112 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 113 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 114 return error; 115 116 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 117 return error; 118 119 if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0) 120 return error; 121 122 arginfo->ps_envstr = cpp; /* remember location of envp for later */ 123 124 for (; --envc >= 0; sp += len, dp += len) 125 if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || 126 (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) 127 return error; 128 129 if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) 130 return error; 131 132 *stackp = (char *)cpp; 133 return 0; 134 } 135 136 int 137 exec_linux_aout_makecmds(l, epp) 138 struct lwp *l; 139 struct exec_package *epp; 140 { 141 struct exec *linux_ep = epp->ep_hdr; 142 int machtype, magic; 143 int error = ENOEXEC; 144 145 magic = LINUX_N_MAGIC(linux_ep); 146 machtype = LINUX_N_MACHTYPE(linux_ep); 147 148 149 if (machtype != LINUX_MID_MACHINE) 150 return (ENOEXEC); 151 152 switch (magic) { 153 case QMAGIC: 154 error = exec_linux_aout_prep_qmagic(l, epp); 155 break; 156 case ZMAGIC: 157 error = exec_linux_aout_prep_zmagic(l, epp); 158 break; 159 case NMAGIC: 160 error = exec_linux_aout_prep_nmagic(l, epp); 161 break; 162 case OMAGIC: 163 error = exec_linux_aout_prep_omagic(l, epp); 164 break; 165 } 166 return error; 167 } 168 169 /* 170 * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 171 * is very likely not page aligned on most architectures, it is treated 172 * as an NMAGIC here. XXX 173 */ 174 175 static int 176 exec_linux_aout_prep_zmagic(l, epp) 177 struct lwp *l; 178 struct exec_package *epp; 179 { 180 struct exec *execp = epp->ep_hdr; 181 182 epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); 183 epp->ep_tsize = execp->a_text; 184 epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); 185 epp->ep_dsize = execp->a_data + execp->a_bss; 186 epp->ep_entry = execp->a_entry; 187 188 /* set up command for text segment */ 189 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 190 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), 191 VM_PROT_READ|VM_PROT_EXECUTE); 192 193 /* set up command for data segment */ 194 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 195 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), 196 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 197 198 /* set up command for bss segment */ 199 if (execp->a_bss) 200 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 201 epp->ep_daddr + execp->a_data, NULLVP, 0, 202 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 203 204 return (*epp->ep_esch->es_setup_stack)(l, epp); 205 } 206 207 /* 208 * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. 209 * Not different from the normal stuff. 210 */ 211 212 static int 213 exec_linux_aout_prep_nmagic(l, epp) 214 struct lwp *l; 215 struct exec_package *epp; 216 { 217 struct exec *execp = epp->ep_hdr; 218 long bsize, baddr; 219 220 epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); 221 epp->ep_tsize = execp->a_text; 222 epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); 223 epp->ep_dsize = execp->a_data + execp->a_bss; 224 epp->ep_entry = execp->a_entry; 225 226 /* set up command for text segment */ 227 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, 228 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), 229 VM_PROT_READ|VM_PROT_EXECUTE); 230 231 /* set up command for data segment */ 232 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, 233 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), 234 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 235 236 /* set up command for bss segment */ 237 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 238 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 239 if (bsize > 0) 240 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 241 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 242 243 return (*epp->ep_esch->es_setup_stack)(l, epp); 244 } 245 246 /* 247 * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. 248 * Business as usual. 249 */ 250 251 static int 252 exec_linux_aout_prep_omagic(l, epp) 253 struct lwp *l; 254 struct exec_package *epp; 255 { 256 struct exec *execp = epp->ep_hdr; 257 long dsize, bsize, baddr; 258 259 epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); 260 epp->ep_tsize = execp->a_text; 261 epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); 262 epp->ep_dsize = execp->a_data + execp->a_bss; 263 epp->ep_entry = execp->a_entry; 264 265 /* set up command for text and data segments */ 266 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, 267 execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, 268 LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 269 270 /* set up command for bss segment */ 271 baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); 272 bsize = epp->ep_daddr + epp->ep_dsize - baddr; 273 if (bsize > 0) 274 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, 275 NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 276 277 /* 278 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); 279 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are 280 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' 281 * respectively to page boundaries. 282 * Compensate `ep_dsize' for the amount of data covered by the last 283 * text page. 284 */ 285 dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, 286 PAGE_SIZE); 287 epp->ep_dsize = (dsize > 0) ? dsize : 0; 288 return (*epp->ep_esch->es_setup_stack)(l, epp); 289 } 290 291 static int 292 exec_linux_aout_prep_qmagic(l, epp) 293 struct lwp *l; 294 struct exec_package *epp; 295 { 296 struct exec *execp = epp->ep_hdr; 297 int error; 298 299 epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); 300 epp->ep_tsize = execp->a_text; 301 epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); 302 epp->ep_dsize = execp->a_data + execp->a_bss; 303 epp->ep_entry = execp->a_entry; 304 305 error = vn_marktext(epp->ep_vp); 306 if (error) 307 return (error); 308 309 /* set up command for text segment */ 310 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, 311 epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), 312 VM_PROT_READ|VM_PROT_EXECUTE); 313 314 /* set up command for data segment */ 315 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, 316 epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), 317 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 318 319 /* set up command for bss segment */ 320 if (execp->a_bss) 321 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, 322 epp->ep_daddr + execp->a_data, NULLVP, 0, 323 VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); 324 325 return (*epp->ep_esch->es_setup_stack)(l, epp); 326 } 327
Indexes created Tue Sep 23 20:09:58 GMT 2025