1 /*- 2 * Copyright (c) 2002 Doug Rabson 3 * Copyright (c) 2003 Peter Wemm 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_compat.h" 32 33 #define __ELF_WORD_SIZE 32 34 35 #include <sys/param.h> 36 #include <sys/exec.h> 37 #include <sys/fcntl.h> 38 #include <sys/imgact.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mutex.h> 43 #include <sys/mman.h> 44 #include <sys/namei.h> 45 #include <sys/pioctl.h> 46 #include <sys/proc.h> 47 #include <sys/procfs.h> 48 #include <sys/resourcevar.h> 49 #include <sys/systm.h> 50 #include <sys/signalvar.h> 51 #include <sys/stat.h> 52 #include <sys/sx.h> 53 #include <sys/syscall.h> 54 #include <sys/sysctl.h> 55 #include <sys/sysent.h> 56 #include <sys/vnode.h> 57 #include <sys/imgact_elf.h> 58 59 #include <vm/vm.h> 60 #include <vm/vm_kern.h> 61 #include <vm/vm_param.h> 62 #include <vm/pmap.h> 63 #include <vm/vm_map.h> 64 #include <vm/vm_object.h> 65 #include <vm/vm_extern.h> 66 67 #include <compat/freebsd32/freebsd32_signal.h> 68 #include <compat/freebsd32/freebsd32_util.h> 69 #include <compat/freebsd32/freebsd32_proto.h> 70 #include <compat/freebsd32/freebsd32_syscall.h> 71 #include <compat/ia32/ia32_signal.h> 72 #ifdef __amd64__ 73 #include <machine/psl.h> 74 #include <machine/segments.h> 75 #include <machine/specialreg.h> 76 #else 77 #include <i386/include/psl.h> 78 #include <i386/include/segments.h> 79 #include <i386/include/specialreg.h> 80 #endif 81 #include <machine/frame.h> 82 #include <machine/md_var.h> 83 #include <machine/pcb.h> 84 #include <machine/cpufunc.h> 85 86 CTASSERT(sizeof(struct ia32_mcontext) == 640); 87 CTASSERT(sizeof(struct ia32_ucontext) == 704); 88 CTASSERT(sizeof(struct ia32_sigframe) == 800); 89 CTASSERT(sizeof(struct siginfo32) == 64); 90 #ifdef COMPAT_FREEBSD4 91 CTASSERT(sizeof(struct ia32_mcontext4) == 260); 92 CTASSERT(sizeof(struct ia32_ucontext4) == 324); 93 CTASSERT(sizeof(struct ia32_sigframe4) == 408); 94 #endif 95 96 static register_t *ia32_copyout_strings(struct image_params *imgp); 97 static void ia32_fixlimit(struct rlimit *rl, int which); 98 99 extern struct sysent freebsd32_sysent[]; 100 101 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode"); 102 103 static u_long ia32_maxdsiz = IA32_MAXDSIZ; 104 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, ""); 105 static u_long ia32_maxssiz = IA32_MAXSSIZ; 106 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, ""); 107 static u_long ia32_maxvmem = IA32_MAXVMEM; 108 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, ""); 109 110 struct sysentvec ia32_freebsd_sysvec = { 111 FREEBSD32_SYS_MAXSYSCALL, 112 freebsd32_sysent, 113 0, 114 0, 115 NULL, 116 0, 117 NULL, 118 NULL, 119 elf32_freebsd_fixup, 120 ia32_sendsig, 121 ia32_sigcode, 122 &sz_ia32_sigcode, 123 NULL, 124 "FreeBSD ELF32", 125 elf32_coredump, 126 NULL, 127 MINSIGSTKSZ, 128 IA32_PAGE_SIZE, 129 0, 130 FREEBSD32_USRSTACK, 131 FREEBSD32_USRSTACK, 132 FREEBSD32_PS_STRINGS, 133 VM_PROT_ALL, 134 ia32_copyout_strings, 135 ia32_setregs, 136 ia32_fixlimit, 137 &ia32_maxssiz 138 }; 139 140 141 static Elf32_Brandinfo ia32_brand_info = { 142 ELFOSABI_FREEBSD, 143 EM_386, 144 "FreeBSD", 145 NULL, 146 "/libexec/ld-elf.so.1", 147 &ia32_freebsd_sysvec, 148 "/libexec/ld-elf32.so.1", 149 BI_CAN_EXEC_DYN, 150 }; 151 152 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY, 153 (sysinit_cfunc_t) elf32_insert_brand_entry, 154 &ia32_brand_info); 155 156 static Elf32_Brandinfo ia32_brand_oinfo = { 157 ELFOSABI_FREEBSD, 158 EM_386, 159 "FreeBSD", 160 NULL, 161 "/usr/libexec/ld-elf.so.1", 162 &ia32_freebsd_sysvec, 163 "/libexec/ld-elf32.so.1", 164 BI_CAN_EXEC_DYN, 165 }; 166 167 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 168 (sysinit_cfunc_t) elf32_insert_brand_entry, 169 &ia32_brand_oinfo); 170 171 172 void 173 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 174 size_t *off __unused) 175 { 176 } 177 178 179 /* XXX may be freebsd32 MI */ 180 static register_t * 181 ia32_copyout_strings(struct image_params *imgp) 182 { 183 int argc, envc; 184 u_int32_t *vectp; 185 char *stringp, *destp; 186 u_int32_t *stack_base; 187 struct freebsd32_ps_strings *arginfo; 188 int szsigcode; 189 190 /* 191 * Calculate string base and vector table pointers. 192 * Also deal with signal trampoline code for this exec type. 193 */ 194 arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS; 195 szsigcode = *(imgp->proc->p_sysent->sv_szsigcode); 196 destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - 197 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *)); 198 199 /* 200 * install sigcode 201 */ 202 if (szsigcode) 203 copyout(imgp->proc->p_sysent->sv_sigcode, 204 ((caddr_t)arginfo - szsigcode), szsigcode); 205 206 /* 207 * If we have a valid auxargs ptr, prepare some room 208 * on the stack. 209 */ 210 if (imgp->auxargs) { 211 /* 212 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 213 * lower compatibility. 214 */ 215 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size 216 : (AT_COUNT * 2); 217 /* 218 * The '+ 2' is for the null pointers at the end of each of 219 * the arg and env vector sets,and imgp->auxarg_size is room 220 * for argument of Runtime loader. 221 */ 222 vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 + 223 imgp->auxarg_size) * sizeof(u_int32_t)); 224 225 } else 226 /* 227 * The '+ 2' is for the null pointers at the end of each of 228 * the arg and env vector sets 229 */ 230 vectp = (u_int32_t *) 231 (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t)); 232 233 /* 234 * vectp also becomes our initial stack base 235 */ 236 stack_base = vectp; 237 238 stringp = imgp->args->begin_argv; 239 argc = imgp->args->argc; 240 envc = imgp->args->envc; 241 /* 242 * Copy out strings - arguments and environment. 243 */ 244 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 245 246 /* 247 * Fill in "ps_strings" struct for ps, w, etc. 248 */ 249 suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp); 250 suword32(&arginfo->ps_nargvstr, argc); 251 252 /* 253 * Fill in argument portion of vector table. 254 */ 255 for (; argc > 0; --argc) { 256 suword32(vectp++, (u_int32_t)(intptr_t)destp); 257 while (*stringp++ != 0) 258 destp++; 259 destp++; 260 } 261 262 /* a null vector table pointer separates the argp's from the envp's */ 263 suword32(vectp++, 0); 264 265 suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp); 266 suword32(&arginfo->ps_nenvstr, envc); 267 268 /* 269 * Fill in environment portion of vector table. 270 */ 271 for (; envc > 0; --envc) { 272 suword32(vectp++, (u_int32_t)(intptr_t)destp); 273 while (*stringp++ != 0) 274 destp++; 275 destp++; 276 } 277 278 /* end of vector table is a null pointer */ 279 suword32(vectp, 0); 280 281 return ((register_t *)stack_base); 282 } 283 284 static void 285 ia32_fixlimit(struct rlimit *rl, int which) 286 { 287 288 switch (which) { 289 case RLIMIT_DATA: 290 if (ia32_maxdsiz != 0) { 291 if (rl->rlim_cur > ia32_maxdsiz) 292 rl->rlim_cur = ia32_maxdsiz; 293 if (rl->rlim_max > ia32_maxdsiz) 294 rl->rlim_max = ia32_maxdsiz; 295 } 296 break; 297 case RLIMIT_STACK: 298 if (ia32_maxssiz != 0) { 299 if (rl->rlim_cur > ia32_maxssiz) 300 rl->rlim_cur = ia32_maxssiz; 301 if (rl->rlim_max > ia32_maxssiz) 302 rl->rlim_max = ia32_maxssiz; 303 } 304 break; 305 case RLIMIT_VMEM: 306 if (ia32_maxvmem != 0) { 307 if (rl->rlim_cur > ia32_maxvmem) 308 rl->rlim_cur = ia32_maxvmem; 309 if (rl->rlim_max > ia32_maxvmem) 310 rl->rlim_max = ia32_maxvmem; 311 } 312 break; 313 } 314 } 315