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/elf.h> 37 #include <sys/exec.h> 38 #include <sys/fcntl.h> 39 #include <sys/imgact.h> 40 #include <sys/kernel.h> 41 #include <sys/lock.h> 42 #include <sys/malloc.h> 43 #include <sys/mutex.h> 44 #include <sys/mman.h> 45 #include <sys/namei.h> 46 #include <sys/proc.h> 47 #include <sys/procfs.h> 48 #include <sys/reg.h> 49 #include <sys/resourcevar.h> 50 #include <sys/systm.h> 51 #include <sys/signalvar.h> 52 #include <sys/stat.h> 53 #include <sys/sx.h> 54 #include <sys/syscall.h> 55 #include <sys/sysctl.h> 56 #include <sys/sysent.h> 57 #include <sys/vnode.h> 58 #include <sys/imgact_elf.h> 59 60 #include <vm/vm.h> 61 #include <vm/vm_kern.h> 62 #include <vm/vm_param.h> 63 #include <vm/pmap.h> 64 #include <vm/vm_map.h> 65 #include <vm/vm_object.h> 66 #include <vm/vm_extern.h> 67 68 #include <compat/freebsd32/freebsd32_signal.h> 69 #include <compat/freebsd32/freebsd32_util.h> 70 #include <compat/freebsd32/freebsd32_proto.h> 71 #include <compat/freebsd32/freebsd32_syscall.h> 72 #include <compat/ia32/ia32_signal.h> 73 #include <machine/frame.h> 74 #include <machine/md_var.h> 75 #include <machine/pcb.h> 76 #include <machine/cpufunc.h> 77 78 CTASSERT(sizeof(struct ia32_mcontext) == 640); 79 CTASSERT(sizeof(struct ia32_ucontext) == 704); 80 CTASSERT(sizeof(struct ia32_sigframe) == 800); 81 CTASSERT(sizeof(struct siginfo32) == 64); 82 #ifdef COMPAT_FREEBSD4 83 CTASSERT(sizeof(struct ia32_freebsd4_mcontext) == 260); 84 CTASSERT(sizeof(struct ia32_freebsd4_ucontext) == 324); 85 CTASSERT(sizeof(struct ia32_freebsd4_sigframe) == 408); 86 #endif 87 88 #include "vdso_ia32_offsets.h" 89 90 extern const char _binary_elf_vdso32_so_1_start[]; 91 extern const char _binary_elf_vdso32_so_1_end[]; 92 extern char _binary_elf_vdso32_so_1_size; 93 94 extern const char *freebsd32_syscallnames[]; 95 96 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 97 "ia32 mode"); 98 99 static u_long ia32_maxdsiz = IA32_MAXDSIZ; 100 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, ""); 101 u_long ia32_maxssiz = IA32_MAXSSIZ; 102 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, ""); 103 static u_long ia32_maxvmem = IA32_MAXVMEM; 104 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, ""); 105 106 struct sysentvec ia32_freebsd_sysvec = { 107 .sv_size = FREEBSD32_SYS_MAXSYSCALL, 108 .sv_table = freebsd32_sysent, 109 .sv_transtrap = NULL, 110 .sv_fixup = elf32_freebsd_fixup, 111 .sv_sendsig = ia32_sendsig, 112 .sv_sigcode = _binary_elf_vdso32_so_1_start, 113 .sv_szsigcode = (int *)&_binary_elf_vdso32_so_1_size, 114 .sv_sigcodeoff = VDSO_IA32_SIGCODE_OFFSET, 115 .sv_name = "FreeBSD ELF32", 116 .sv_coredump = elf32_coredump, 117 .sv_elf_core_osabi = ELFOSABI_FREEBSD, 118 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 119 .sv_elf_core_prepare_notes = elf32_prepare_notes, 120 .sv_imgact_try = NULL, 121 .sv_minsigstksz = MINSIGSTKSZ, 122 .sv_minuser = FREEBSD32_MINUSER, 123 .sv_maxuser = FREEBSD32_MAXUSER, 124 .sv_usrstack = FREEBSD32_USRSTACK, 125 .sv_psstrings = FREEBSD32_PS_STRINGS, 126 .sv_psstringssz = sizeof(struct freebsd32_ps_strings), 127 .sv_stackprot = VM_PROT_ALL, 128 .sv_copyout_auxargs = elf32_freebsd_copyout_auxargs, 129 .sv_copyout_strings = freebsd32_copyout_strings, 130 .sv_setregs = ia32_setregs, 131 .sv_fixlimit = ia32_fixlimit, 132 .sv_maxssiz = &ia32_maxssiz, 133 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 | 134 SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER | SV_DSO_SIG, 135 .sv_set_syscall_retval = ia32_set_syscall_retval, 136 .sv_fetch_syscall_args = ia32_fetch_syscall_args, 137 .sv_syscallnames = freebsd32_syscallnames, 138 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 139 .sv_shared_page_len = PAGE_SIZE, 140 .sv_schedtail = NULL, 141 .sv_thread_detach = NULL, 142 .sv_trap = NULL, 143 .sv_onexec_old = exec_onexec_old, 144 .sv_onexit = exit_onexit, 145 .sv_set_fork_retval = x86_set_fork_retval, 146 .sv_regset_begin = SET_BEGIN(__elfN(regset)), 147 .sv_regset_end = SET_LIMIT(__elfN(regset)), 148 }; 149 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec); 150 151 static Elf32_Brandinfo ia32_brand_info = { 152 .brand = ELFOSABI_FREEBSD, 153 .machine = EM_386, 154 .compat_3_brand = "FreeBSD", 155 .emul_path = NULL, 156 .interp_path = "/libexec/ld-elf.so.1", 157 .sysvec = &ia32_freebsd_sysvec, 158 .interp_newpath = "/libexec/ld-elf32.so.1", 159 .brand_note = &elf32_freebsd_brandnote, 160 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 161 }; 162 163 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE, 164 (sysinit_cfunc_t) elf32_insert_brand_entry, 165 &ia32_brand_info); 166 167 static Elf32_Brandinfo ia32_brand_oinfo = { 168 .brand = ELFOSABI_FREEBSD, 169 .machine = EM_386, 170 .compat_3_brand = "FreeBSD", 171 .emul_path = NULL, 172 .interp_path = "/usr/libexec/ld-elf.so.1", 173 .sysvec = &ia32_freebsd_sysvec, 174 .interp_newpath = "/libexec/ld-elf32.so.1", 175 .brand_note = &elf32_freebsd_brandnote, 176 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 177 }; 178 179 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 180 (sysinit_cfunc_t) elf32_insert_brand_entry, 181 &ia32_brand_oinfo); 182 183 static Elf32_Brandinfo kia32_brand_info = { 184 .brand = ELFOSABI_FREEBSD, 185 .machine = EM_386, 186 .compat_3_brand = "FreeBSD", 187 .emul_path = NULL, 188 .interp_path = "/lib/ld.so.1", 189 .sysvec = &ia32_freebsd_sysvec, 190 .brand_note = &elf32_kfreebsd_brandnote, 191 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 192 }; 193 194 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY, 195 (sysinit_cfunc_t) elf32_insert_brand_entry, 196 &kia32_brand_info); 197 198 void 199 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 200 { 201 void *buf; 202 size_t len; 203 204 len = 0; 205 if (use_xsave) { 206 if (dst != NULL) { 207 fpugetregs(td); 208 len += elf32_populate_note(NT_X86_XSTATE, 209 get_pcb_user_save_td(td), dst, 210 cpu_max_ext_state_size, &buf); 211 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 212 xsave_mask; 213 } else 214 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL, 215 cpu_max_ext_state_size, NULL); 216 } 217 *off = len; 218 } 219 220 void 221 ia32_fixlimit(struct rlimit *rl, int which) 222 { 223 224 switch (which) { 225 case RLIMIT_DATA: 226 if (ia32_maxdsiz != 0) { 227 if (rl->rlim_cur > ia32_maxdsiz) 228 rl->rlim_cur = ia32_maxdsiz; 229 if (rl->rlim_max > ia32_maxdsiz) 230 rl->rlim_max = ia32_maxdsiz; 231 } 232 break; 233 case RLIMIT_STACK: 234 if (ia32_maxssiz != 0) { 235 if (rl->rlim_cur > ia32_maxssiz) 236 rl->rlim_cur = ia32_maxssiz; 237 if (rl->rlim_max > ia32_maxssiz) 238 rl->rlim_max = ia32_maxssiz; 239 } 240 break; 241 case RLIMIT_VMEM: 242 if (ia32_maxvmem != 0) { 243 if (rl->rlim_cur > ia32_maxvmem) 244 rl->rlim_cur = ia32_maxvmem; 245 if (rl->rlim_max > ia32_maxvmem) 246 rl->rlim_max = ia32_maxvmem; 247 } 248 break; 249 } 250 } 251