ia32_sysvec.c revision 183322
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: head/sys/compat/ia32/ia32_sysvec.c 183322 2008-09-24 10:14:37Z kib $"); 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 86CTASSERT(sizeof(struct ia32_mcontext) == 640); 87CTASSERT(sizeof(struct ia32_ucontext) == 704); 88CTASSERT(sizeof(struct ia32_sigframe) == 800); 89CTASSERT(sizeof(struct siginfo32) == 64); 90#ifdef COMPAT_FREEBSD4 91CTASSERT(sizeof(struct ia32_mcontext4) == 260); 92CTASSERT(sizeof(struct ia32_ucontext4) == 324); 93CTASSERT(sizeof(struct ia32_sigframe4) == 408); 94#endif 95 96static register_t *ia32_copyout_strings(struct image_params *imgp); 97static void ia32_fixlimit(struct rlimit *rl, int which); 98 99extern struct sysent freebsd32_sysent[]; 100 101SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode"); 102 103static u_long ia32_maxdsiz = IA32_MAXDSIZ; 104SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, ""); 105TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz); 106static u_long ia32_maxssiz = IA32_MAXSSIZ; 107SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, ""); 108TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz); 109static u_long ia32_maxvmem = IA32_MAXVMEM; 110SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, ""); 111TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem); 112 113struct sysentvec ia32_freebsd_sysvec = { 114 .sv_size = FREEBSD32_SYS_MAXSYSCALL, 115 .sv_table = freebsd32_sysent, 116 .sv_mask = 0, 117 .sv_sigsize = 0, 118 .sv_sigtbl = NULL, 119 .sv_errsize = 0, 120 .sv_errtbl = NULL, 121 .sv_transtrap = NULL, 122 .sv_fixup = elf32_freebsd_fixup, 123 .sv_sendsig = ia32_sendsig, 124 .sv_sigcode = ia32_sigcode, 125 .sv_szsigcode = &sz_ia32_sigcode, 126 .sv_prepsyscall = NULL, 127 .sv_name = "FreeBSD ELF32", 128 .sv_coredump = elf32_coredump, 129 .sv_imgact_try = NULL, 130 .sv_minsigstksz = MINSIGSTKSZ, 131 .sv_pagesize = IA32_PAGE_SIZE, 132 .sv_minuser = 0, 133 .sv_maxuser = FREEBSD32_USRSTACK, 134 .sv_usrstack = FREEBSD32_USRSTACK, 135 .sv_psstrings = FREEBSD32_PS_STRINGS, 136 .sv_stackprot = VM_PROT_ALL, 137 .sv_copyout_strings = ia32_copyout_strings, 138 .sv_setregs = ia32_setregs, 139 .sv_fixlimit = ia32_fixlimit, 140 .sv_maxssiz = &ia32_maxssiz 141}; 142 143 144static Elf32_Brandinfo ia32_brand_info = { 145 .brand = ELFOSABI_FREEBSD, 146 .machine = EM_386, 147 .compat_3_brand = "FreeBSD", 148 .emul_path = NULL, 149 .interp_path = "/libexec/ld-elf.so.1", 150 .sysvec = &ia32_freebsd_sysvec, 151 .interp_newpath = "/libexec/ld-elf32.so.1", 152 .flags = BI_CAN_EXEC_DYN 153}; 154 155SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY, 156 (sysinit_cfunc_t) elf32_insert_brand_entry, 157 &ia32_brand_info); 158 159static Elf32_Brandinfo ia32_brand_oinfo = { 160 .brand = ELFOSABI_FREEBSD, 161 .machine = EM_386, 162 .compat_3_brand = "FreeBSD", 163 .emul_path = NULL, 164 .interp_path = "/usr/libexec/ld-elf.so.1", 165 .sysvec = &ia32_freebsd_sysvec, 166 .interp_newpath = "/libexec/ld-elf32.so.1", 167 .flags = BI_CAN_EXEC_DYN, 168}; 169 170SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 171 (sysinit_cfunc_t) elf32_insert_brand_entry, 172 &ia32_brand_oinfo); 173 174 175void 176elf32_dump_thread(struct thread *td __unused, void *dst __unused, 177 size_t *off __unused) 178{ 179} 180 181 182/* XXX may be freebsd32 MI */ 183static register_t * 184ia32_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 287static void 288ia32_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