1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002 Doug Rabson 5 * Copyright (c) 2003 Peter Wemm 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 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 #include <machine/frame.h> 73 #include <machine/md_var.h> 74 #include <machine/pcb.h> 75 #include <machine/cpufunc.h> 76 77 CTASSERT(sizeof(struct ia32_mcontext) == 640); 78 CTASSERT(sizeof(struct ia32_ucontext) == 704); 79 CTASSERT(sizeof(struct ia32_sigframe) == 800); 80 CTASSERT(sizeof(struct siginfo32) == 64); 81 #ifdef COMPAT_FREEBSD4 82 CTASSERT(sizeof(struct ia32_mcontext4) == 260); 83 CTASSERT(sizeof(struct ia32_ucontext4) == 324); 84 CTASSERT(sizeof(struct ia32_sigframe4) == 408); 85 #endif 86 87 extern const char *freebsd32_syscallnames[]; 88 89 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode"); 90 91 static u_long ia32_maxdsiz = IA32_MAXDSIZ; 92 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, ""); 93 u_long ia32_maxssiz = IA32_MAXSSIZ; 94 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, ""); 95 static u_long ia32_maxvmem = IA32_MAXVMEM; 96 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, ""); 97 98 struct sysentvec ia32_freebsd_sysvec = { 99 .sv_size = FREEBSD32_SYS_MAXSYSCALL, 100 .sv_table = freebsd32_sysent, 101 .sv_mask = 0, 102 .sv_errsize = 0, 103 .sv_errtbl = NULL, 104 .sv_transtrap = NULL, 105 .sv_fixup = elf32_freebsd_fixup, 106 .sv_sendsig = ia32_sendsig, 107 .sv_sigcode = ia32_sigcode, 108 .sv_szsigcode = &sz_ia32_sigcode, 109 .sv_name = "FreeBSD ELF32", 110 .sv_coredump = elf32_coredump, 111 .sv_imgact_try = NULL, 112 .sv_minsigstksz = MINSIGSTKSZ, 113 .sv_pagesize = IA32_PAGE_SIZE, 114 .sv_minuser = FREEBSD32_MINUSER, 115 .sv_maxuser = FREEBSD32_MAXUSER, 116 .sv_usrstack = FREEBSD32_USRSTACK, 117 .sv_psstrings = FREEBSD32_PS_STRINGS, 118 .sv_stackprot = VM_PROT_ALL, 119 .sv_copyout_strings = freebsd32_copyout_strings, 120 .sv_setregs = ia32_setregs, 121 .sv_fixlimit = ia32_fixlimit, 122 .sv_maxssiz = &ia32_maxssiz, 123 .sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 | 124 SV_SHP | SV_TIMEKEEP, 125 .sv_set_syscall_retval = ia32_set_syscall_retval, 126 .sv_fetch_syscall_args = ia32_fetch_syscall_args, 127 .sv_syscallnames = freebsd32_syscallnames, 128 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 129 .sv_shared_page_len = PAGE_SIZE, 130 .sv_schedtail = NULL, 131 .sv_thread_detach = NULL, 132 .sv_trap = NULL, 133 }; 134 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec); 135 136 static Elf32_Brandinfo ia32_brand_info = { 137 .brand = ELFOSABI_FREEBSD, 138 .machine = EM_386, 139 .compat_3_brand = "FreeBSD", 140 .emul_path = NULL, 141 .interp_path = "/libexec/ld-elf.so.1", 142 .sysvec = &ia32_freebsd_sysvec, 143 .interp_newpath = "/libexec/ld-elf32.so.1", 144 .brand_note = &elf32_freebsd_brandnote, 145 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 146 }; 147 148 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE, 149 (sysinit_cfunc_t) elf32_insert_brand_entry, 150 &ia32_brand_info); 151 152 static Elf32_Brandinfo ia32_brand_oinfo = { 153 .brand = ELFOSABI_FREEBSD, 154 .machine = EM_386, 155 .compat_3_brand = "FreeBSD", 156 .emul_path = NULL, 157 .interp_path = "/usr/libexec/ld-elf.so.1", 158 .sysvec = &ia32_freebsd_sysvec, 159 .interp_newpath = "/libexec/ld-elf32.so.1", 160 .brand_note = &elf32_freebsd_brandnote, 161 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 162 }; 163 164 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 165 (sysinit_cfunc_t) elf32_insert_brand_entry, 166 &ia32_brand_oinfo); 167 168 static Elf32_Brandinfo kia32_brand_info = { 169 .brand = ELFOSABI_FREEBSD, 170 .machine = EM_386, 171 .compat_3_brand = "FreeBSD", 172 .emul_path = NULL, 173 .interp_path = "/lib/ld.so.1", 174 .sysvec = &ia32_freebsd_sysvec, 175 .brand_note = &elf32_kfreebsd_brandnote, 176 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 177 }; 178 179 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY, 180 (sysinit_cfunc_t) elf32_insert_brand_entry, 181 &kia32_brand_info); 182 183 void 184 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 185 { 186 void *buf; 187 size_t len; 188 189 len = 0; 190 if (use_xsave) { 191 if (dst != NULL) { 192 fpugetregs(td); 193 len += elf32_populate_note(NT_X86_XSTATE, 194 get_pcb_user_save_td(td), dst, 195 cpu_max_ext_state_size, &buf); 196 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 197 xsave_mask; 198 } else 199 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL, 200 cpu_max_ext_state_size, NULL); 201 } 202 *off = len; 203 } 204 205 void 206 ia32_fixlimit(struct rlimit *rl, int which) 207 { 208 209 switch (which) { 210 case RLIMIT_DATA: 211 if (ia32_maxdsiz != 0) { 212 if (rl->rlim_cur > ia32_maxdsiz) 213 rl->rlim_cur = ia32_maxdsiz; 214 if (rl->rlim_max > ia32_maxdsiz) 215 rl->rlim_max = ia32_maxdsiz; 216 } 217 break; 218 case RLIMIT_STACK: 219 if (ia32_maxssiz != 0) { 220 if (rl->rlim_cur > ia32_maxssiz) 221 rl->rlim_cur = ia32_maxssiz; 222 if (rl->rlim_max > ia32_maxssiz) 223 rl->rlim_max = ia32_maxssiz; 224 } 225 break; 226 case RLIMIT_VMEM: 227 if (ia32_maxvmem != 0) { 228 if (rl->rlim_cur > ia32_maxvmem) 229 rl->rlim_cur = ia32_maxvmem; 230 if (rl->rlim_max > ia32_maxvmem) 231 rl->rlim_max = ia32_maxvmem; 232 } 233 break; 234 } 235 } 236