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 TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz); 106 static u_long ia32_maxssiz = IA32_MAXSSIZ; 107 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, ""); 108 TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz); 109 static u_long ia32_maxvmem = IA32_MAXVMEM; 110 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, ""); 111 TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem); 112 113 struct sysentvec ia32_freebsd_sysvec = { 114 FREEBSD32_SYS_MAXSYSCALL, 115 freebsd32_sysent, 116 0, 117 0, 118 NULL, 119 0, 120 NULL, 121 NULL, 122 elf32_freebsd_fixup, 123 ia32_sendsig, 124 ia32_sigcode, 125 &sz_ia32_sigcode, 126 NULL, 127 "FreeBSD ELF32", 128 elf32_coredump, 129 NULL, 130 MINSIGSTKSZ, 131 IA32_PAGE_SIZE, 132 0, 133 FREEBSD32_USRSTACK, 134 FREEBSD32_USRSTACK, 135 FREEBSD32_PS_STRINGS, 136 VM_PROT_ALL, 137 ia32_copyout_strings, 138 ia32_setregs, 139 ia32_fixlimit, 140 &ia32_maxssiz 141 }; 142 143 144 static Elf32_Brandinfo ia32_brand_info = { 145 ELFOSABI_FREEBSD, 146 EM_386, 147 "FreeBSD", 148 NULL, 149 "/libexec/ld-elf.so.1", 150 &ia32_freebsd_sysvec, 151 "/libexec/ld-elf32.so.1", 152 BI_CAN_EXEC_DYN, 153 }; 154 155 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY, 156 (sysinit_cfunc_t) elf32_insert_brand_entry, 157 &ia32_brand_info); 158 159 static Elf32_Brandinfo ia32_brand_oinfo = { 160 ELFOSABI_FREEBSD, 161 EM_386, 162 "FreeBSD", 163 NULL, 164 "/usr/libexec/ld-elf.so.1", 165 &ia32_freebsd_sysvec, 166 "/libexec/ld-elf32.so.1", 167 BI_CAN_EXEC_DYN, 168 }; 169 170 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 171 (sysinit_cfunc_t) elf32_insert_brand_entry, 172 &ia32_brand_oinfo); 173 174 175 void 176 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 177 size_t *off __unused) 178 { 179 } 180 181 182 /* XXX may be freebsd32 MI */ 183 static register_t * 184 ia32_copyout_strings(struct image_params *imgp) 185 { 186 int argc, envc; 187 u_int32_t *vectp; 188 char *stringp, *destp; 189 u_int32_t *stack_base; 190 struct freebsd32_ps_strings *arginfo; 191 int szsigcode; 192 193 /* 194 * Calculate string base and vector table pointers. 195 * Also deal with signal trampoline code for this exec type. 196 */ 197 arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS; 198 szsigcode = *(imgp->proc->p_sysent->sv_szsigcode); 199 destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - 200 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *)); 201 202 /* 203 * install sigcode 204 */ 205 if (szsigcode) 206 copyout(imgp->proc->p_sysent->sv_sigcode, 207 ((caddr_t)arginfo - szsigcode), szsigcode); 208 209 /* 210 * If we have a valid auxargs ptr, prepare some room 211 * on the stack. 212 */ 213 if (imgp->auxargs) { 214 /* 215 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 216 * lower compatibility. 217 */ 218 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size 219 : (AT_COUNT * 2); 220 /* 221 * The '+ 2' is for the null pointers at the end of each of 222 * the arg and env vector sets,and imgp->auxarg_size is room 223 * for argument of Runtime loader. 224 */ 225 vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 + 226 imgp->auxarg_size) * sizeof(u_int32_t)); 227 228 } else 229 /* 230 * The '+ 2' is for the null pointers at the end of each of 231 * the arg and env vector sets 232 */ 233 vectp = (u_int32_t *) 234 (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t)); 235 236 /* 237 * vectp also becomes our initial stack base 238 */ 239 stack_base = vectp; 240 241 stringp = imgp->args->begin_argv; 242 argc = imgp->args->argc; 243 envc = imgp->args->envc; 244 /* 245 * Copy out strings - arguments and environment. 246 */ 247 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 248 249 /* 250 * Fill in "ps_strings" struct for ps, w, etc. 251 */ 252 suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp); 253 suword32(&arginfo->ps_nargvstr, argc); 254 255 /* 256 * Fill in argument portion of vector table. 257 */ 258 for (; argc > 0; --argc) { 259 suword32(vectp++, (u_int32_t)(intptr_t)destp); 260 while (*stringp++ != 0) 261 destp++; 262 destp++; 263 } 264 265 /* a null vector table pointer separates the argp's from the envp's */ 266 suword32(vectp++, 0); 267 268 suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp); 269 suword32(&arginfo->ps_nenvstr, envc); 270 271 /* 272 * Fill in environment portion of vector table. 273 */ 274 for (; envc > 0; --envc) { 275 suword32(vectp++, (u_int32_t)(intptr_t)destp); 276 while (*stringp++ != 0) 277 destp++; 278 destp++; 279 } 280 281 /* end of vector table is a null pointer */ 282 suword32(vectp, 0); 283 284 return ((register_t *)stack_base); 285 } 286 287 static void 288 ia32_fixlimit(struct rlimit *rl, int which) 289 { 290 291 switch (which) { 292 case RLIMIT_DATA: 293 if (ia32_maxdsiz != 0) { 294 if (rl->rlim_cur > ia32_maxdsiz) 295 rl->rlim_cur = ia32_maxdsiz; 296 if (rl->rlim_max > ia32_maxdsiz) 297 rl->rlim_max = ia32_maxdsiz; 298 } 299 break; 300 case RLIMIT_STACK: 301 if (ia32_maxssiz != 0) { 302 if (rl->rlim_cur > ia32_maxssiz) 303 rl->rlim_cur = ia32_maxssiz; 304 if (rl->rlim_max > ia32_maxssiz) 305 rl->rlim_max = ia32_maxssiz; 306 } 307 break; 308 case RLIMIT_VMEM: 309 if (ia32_maxvmem != 0) { 310 if (rl->rlim_cur > ia32_maxvmem) 311 rl->rlim_cur = ia32_maxvmem; 312 if (rl->rlim_max > ia32_maxvmem) 313 rl->rlim_max = ia32_maxvmem; 314 } 315 break; 316 } 317 } 318