Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/amd64/ia32/ia32_signal.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2003 Peter Wemm 5 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/exec.h> 41 #include <sys/fcntl.h> 42 #include <sys/imgact.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mutex.h> 47 #include <sys/mman.h> 48 #include <sys/namei.h> 49 #include <sys/proc.h> 50 #include <sys/procfs.h> 51 #include <sys/resourcevar.h> 52 #include <sys/systm.h> 53 #include <sys/signalvar.h> 54 #include <sys/stat.h> 55 #include <sys/sx.h> 56 #include <sys/syscall.h> 57 #include <sys/syscallsubr.h> 58 #include <sys/sysctl.h> 59 #include <sys/sysent.h> 60 #include <sys/vnode.h> 61 62 #include <vm/vm.h> 63 #include <vm/vm_kern.h> 64 #include <vm/vm_param.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_map.h> 67 #include <vm/vm_object.h> 68 #include <vm/vm_extern.h> 69 70 #include <compat/freebsd32/freebsd32_signal.h> 71 #include <compat/freebsd32/freebsd32_util.h> 72 #include <compat/freebsd32/freebsd32_proto.h> 73 #include <compat/freebsd32/freebsd32.h> 74 #include <compat/ia32/ia32_signal.h> 75 #include <machine/psl.h> 76 #include <machine/segments.h> 77 #include <machine/specialreg.h> 78 #include <machine/frame.h> 79 #include <machine/md_var.h> 80 #include <machine/pcb.h> 81 #include <machine/cpufunc.h> 82 #include <machine/trap.h> 83 84 #include "vdso_ia32_offsets.h" 85 86 extern const char _binary_elf_vdso32_so_1_start[]; 87 extern const char _binary_elf_vdso32_so_1_end[]; 88 extern char _binary_elf_vdso32_so_1_size; 89 90 #ifdef COMPAT_FREEBSD4 91 static void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *); 92 #endif 93 94 static void 95 ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp, 96 char **xfpusave, size_t *xfpusave_len) 97 { 98 /* 99 * XXX Format of 64bit and 32bit FXSAVE areas differs. FXSAVE 100 * in 32bit mode saves %cs and %ds, while on 64bit it saves 101 * 64bit instruction and data pointers. Ignore the difference 102 * for now, it should be irrelevant for most applications. 103 */ 104 mcp->mc_ownedfp = fpugetregs(td); 105 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0], 106 sizeof(mcp->mc_fpstate)); 107 mcp->mc_fpformat = fpuformat(); 108 if (xfpusave == NULL) 109 return; 110 if (!use_xsave || cpu_max_ext_state_size <= sizeof(struct savefpu)) { 111 *xfpusave_len = 0; 112 *xfpusave = NULL; 113 } else { 114 mcp->mc_flags |= _MC_IA32_HASFPXSTATE; 115 *xfpusave_len = mcp->mc_xfpustate_len = 116 cpu_max_ext_state_size - sizeof(struct savefpu); 117 *xfpusave = (char *)(get_pcb_user_save_td(td) + 1); 118 } 119 } 120 121 static int 122 ia32_set_fpcontext(struct thread *td, struct ia32_mcontext *mcp, 123 char *xfpustate, size_t xfpustate_len) 124 { 125 int error; 126 127 if (mcp->mc_fpformat == _MC_FPFMT_NODEV) 128 return (0); 129 else if (mcp->mc_fpformat != _MC_FPFMT_XMM) 130 return (EINVAL); 131 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) { 132 /* We don't care what state is left in the FPU or PCB. */ 133 fpstate_drop(td); 134 error = 0; 135 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || 136 mcp->mc_ownedfp == _MC_FPOWNED_PCB) { 137 error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate, 138 xfpustate, xfpustate_len); 139 } else 140 return (EINVAL); 141 return (error); 142 } 143 144 /* 145 * Get machine context. 146 */ 147 static int 148 ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags) 149 { 150 struct pcb *pcb; 151 struct trapframe *tp; 152 153 pcb = td->td_pcb; 154 tp = td->td_frame; 155 156 PROC_LOCK(curthread->td_proc); 157 mcp->mc_onstack = sigonstack(tp->tf_rsp); 158 PROC_UNLOCK(curthread->td_proc); 159 /* Entry into kernel always sets TF_HASSEGS */ 160 mcp->mc_gs = tp->tf_gs; 161 mcp->mc_fs = tp->tf_fs; 162 mcp->mc_es = tp->tf_es; 163 mcp->mc_ds = tp->tf_ds; 164 mcp->mc_edi = tp->tf_rdi; 165 mcp->mc_esi = tp->tf_rsi; 166 mcp->mc_ebp = tp->tf_rbp; 167 mcp->mc_isp = tp->tf_rsp; 168 mcp->mc_eflags = tp->tf_rflags; 169 if (flags & GET_MC_CLEAR_RET) { 170 mcp->mc_eax = 0; 171 mcp->mc_edx = 0; 172 mcp->mc_eflags &= ~PSL_C; 173 } else { 174 mcp->mc_eax = tp->tf_rax; 175 mcp->mc_edx = tp->tf_rdx; 176 } 177 mcp->mc_ebx = tp->tf_rbx; 178 mcp->mc_ecx = tp->tf_rcx; 179 mcp->mc_eip = tp->tf_rip; 180 mcp->mc_cs = tp->tf_cs; 181 mcp->mc_esp = tp->tf_rsp; 182 mcp->mc_ss = tp->tf_ss; 183 mcp->mc_len = sizeof(*mcp); 184 mcp->mc_flags = tp->tf_flags; 185 ia32_get_fpcontext(td, mcp, NULL, 0); 186 mcp->mc_fsbase = pcb->pcb_fsbase; 187 mcp->mc_gsbase = pcb->pcb_gsbase; 188 mcp->mc_xfpustate = 0; 189 mcp->mc_xfpustate_len = 0; 190 bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2)); 191 return (0); 192 } 193 194 /* 195 * Set machine context. 196 * 197 * However, we don't set any but the user modifiable flags, and we won't 198 * touch the cs selector. 199 */ 200 static int 201 ia32_set_mcontext(struct thread *td, struct ia32_mcontext *mcp) 202 { 203 struct trapframe *tp; 204 char *xfpustate; 205 long rflags; 206 int ret; 207 208 tp = td->td_frame; 209 if (mcp->mc_len != sizeof(*mcp)) 210 return (EINVAL); 211 rflags = (mcp->mc_eflags & PSL_USERCHANGE) | 212 (tp->tf_rflags & ~PSL_USERCHANGE); 213 if (mcp->mc_flags & _MC_IA32_HASFPXSTATE) { 214 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size - 215 sizeof(struct savefpu)) 216 return (EINVAL); 217 xfpustate = (char *)fpu_save_area_alloc(); 218 ret = copyin(PTRIN(mcp->mc_xfpustate), xfpustate, 219 mcp->mc_xfpustate_len); 220 if (ret != 0) { 221 fpu_save_area_free((struct savefpu *)xfpustate); 222 return (ret); 223 } 224 } else 225 xfpustate = NULL; 226 ret = ia32_set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len); 227 fpu_save_area_free((struct savefpu *)xfpustate); 228 if (ret != 0) 229 return (ret); 230 tp->tf_gs = mcp->mc_gs; 231 tp->tf_fs = mcp->mc_fs; 232 tp->tf_es = mcp->mc_es; 233 tp->tf_ds = mcp->mc_ds; 234 tp->tf_flags = TF_HASSEGS; 235 tp->tf_rdi = mcp->mc_edi; 236 tp->tf_rsi = mcp->mc_esi; 237 tp->tf_rbp = mcp->mc_ebp; 238 tp->tf_rbx = mcp->mc_ebx; 239 tp->tf_rdx = mcp->mc_edx; 240 tp->tf_rcx = mcp->mc_ecx; 241 tp->tf_rax = mcp->mc_eax; 242 /* trapno, err */ 243 tp->tf_rip = mcp->mc_eip; 244 tp->tf_rflags = rflags; 245 tp->tf_rsp = mcp->mc_esp; 246 tp->tf_ss = mcp->mc_ss; 247 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 248 return (0); 249 } 250 251 /* 252 * The first two fields of a ucontext_t are the signal mask and 253 * the machine context. The next field is uc_link; we want to 254 * avoid destroying the link when copying out contexts. 255 */ 256 #define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link) 257 258 int 259 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 260 { 261 struct ia32_ucontext uc; 262 int ret; 263 264 if (uap->ucp == NULL) 265 ret = EINVAL; 266 else { 267 bzero(&uc, sizeof(uc)); 268 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 269 PROC_LOCK(td->td_proc); 270 uc.uc_sigmask = td->td_sigmask; 271 PROC_UNLOCK(td->td_proc); 272 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE); 273 } 274 return (ret); 275 } 276 277 int 278 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 279 { 280 struct ia32_ucontext uc; 281 int ret; 282 283 if (uap->ucp == NULL) 284 ret = EINVAL; 285 else { 286 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE); 287 if (ret == 0) { 288 ret = ia32_set_mcontext(td, &uc.uc_mcontext); 289 if (ret == 0) { 290 kern_sigprocmask(td, SIG_SETMASK, 291 &uc.uc_sigmask, NULL, 0); 292 } 293 } 294 } 295 return (ret == 0 ? EJUSTRETURN : ret); 296 } 297 298 int 299 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 300 { 301 struct ia32_ucontext uc; 302 int ret; 303 304 if (uap->oucp == NULL || uap->ucp == NULL) 305 ret = EINVAL; 306 else { 307 bzero(&uc, sizeof(uc)); 308 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 309 PROC_LOCK(td->td_proc); 310 uc.uc_sigmask = td->td_sigmask; 311 PROC_UNLOCK(td->td_proc); 312 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE); 313 if (ret == 0) { 314 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE); 315 if (ret == 0) { 316 ret = ia32_set_mcontext(td, &uc.uc_mcontext); 317 if (ret == 0) { 318 kern_sigprocmask(td, SIG_SETMASK, 319 &uc.uc_sigmask, NULL, 0); 320 } 321 } 322 } 323 } 324 return (ret == 0 ? EJUSTRETURN : ret); 325 } 326 327 /* 328 * Send an interrupt to process. 329 * 330 * Stack is set up to allow sigcode stored 331 * at top to call routine, followed by kcall 332 * to sigreturn routine below. After sigreturn 333 * resets the signal mask, the stack, and the 334 * frame pointer, it returns to the user 335 * specified pc, psl. 336 */ 337 338 #ifdef COMPAT_43 339 static void 340 ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 341 { 342 struct ia32_osigframe sf, *fp; 343 struct proc *p; 344 struct thread *td; 345 struct sigacts *psp; 346 struct trapframe *regs; 347 int sig; 348 int oonstack; 349 350 td = curthread; 351 p = td->td_proc; 352 PROC_LOCK_ASSERT(p, MA_OWNED); 353 sig = ksi->ksi_signo; 354 psp = p->p_sigacts; 355 mtx_assert(&psp->ps_mtx, MA_OWNED); 356 regs = td->td_frame; 357 oonstack = sigonstack(regs->tf_rsp); 358 359 /* Allocate space for the signal handler context. */ 360 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 361 SIGISMEMBER(psp->ps_sigonstack, sig)) { 362 fp = (struct ia32_osigframe *)((uintptr_t)td->td_sigstk.ss_sp + 363 td->td_sigstk.ss_size - sizeof(sf)); 364 td->td_sigstk.ss_flags |= SS_ONSTACK; 365 } else 366 fp = (struct ia32_osigframe *)regs->tf_rsp - 1; 367 368 /* Build the argument list for the signal handler. */ 369 sf.sf_signum = sig; 370 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 371 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo)); 372 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 373 /* Signal handler installed with SA_SIGINFO. */ 374 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 375 sf.sf_siginfo.si_signo = sig; 376 sf.sf_siginfo.si_code = ksi->ksi_code; 377 sf.sf_ah = (uintptr_t)catcher; 378 sf.sf_addr = 0; 379 } else { 380 /* Old FreeBSD-style arguments. */ 381 sf.sf_arg2 = ksi->ksi_code; 382 sf.sf_addr = (register_t)ksi->ksi_addr; 383 sf.sf_ah = (uintptr_t)catcher; 384 } 385 mtx_unlock(&psp->ps_mtx); 386 PROC_UNLOCK(p); 387 388 /* Save most if not all of trap frame. */ 389 sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax; 390 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx; 391 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx; 392 sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx; 393 sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi; 394 sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi; 395 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 396 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 397 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 398 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 399 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 400 sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs; 401 sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp; 402 403 /* Build the signal context to be used by osigreturn(). */ 404 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 405 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 406 sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp; 407 sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp; 408 sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip; 409 sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags; 410 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 411 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 412 413 /* 414 * Copy the sigframe out to the user's stack. 415 */ 416 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 417 #ifdef DEBUG 418 printf("process %ld has trashed its stack\n", (long)p->p_pid); 419 #endif 420 PROC_LOCK(p); 421 sigexit(td, SIGILL); 422 } 423 424 regs->tf_rsp = (uintptr_t)fp; 425 regs->tf_rip = PROC_PS_STRINGS(p) - 426 (_binary_elf_vdso32_so_1_end - _binary_elf_vdso32_so_1_start) + 427 VDSO_IA32_OSIGCODE_OFFSET; 428 regs->tf_rflags &= ~(PSL_T | PSL_D); 429 regs->tf_cs = _ucode32sel; 430 regs->tf_ds = _udatasel; 431 regs->tf_es = _udatasel; 432 regs->tf_fs = _udatasel; 433 regs->tf_ss = _udatasel; 434 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 435 PROC_LOCK(p); 436 mtx_lock(&psp->ps_mtx); 437 } 438 #endif 439 440 #ifdef COMPAT_FREEBSD4 441 static void 442 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 443 { 444 struct ia32_freebsd4_sigframe sf, *sfp; 445 struct siginfo32 siginfo; 446 struct proc *p; 447 struct thread *td; 448 struct sigacts *psp; 449 struct trapframe *regs; 450 int oonstack; 451 int sig; 452 453 td = curthread; 454 p = td->td_proc; 455 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo); 456 457 PROC_LOCK_ASSERT(p, MA_OWNED); 458 sig = siginfo.si_signo; 459 psp = p->p_sigacts; 460 mtx_assert(&psp->ps_mtx, MA_OWNED); 461 regs = td->td_frame; 462 oonstack = sigonstack(regs->tf_rsp); 463 464 /* Save user context. */ 465 bzero(&sf, sizeof(sf)); 466 sf.sf_uc.uc_sigmask = *mask; 467 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp; 468 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 469 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 470 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 471 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 472 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi; 473 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi; 474 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp; 475 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */ 476 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx; 477 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx; 478 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx; 479 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax; 480 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno; 481 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err; 482 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip; 483 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs; 484 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags; 485 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp; 486 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss; 487 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds; 488 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es; 489 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs; 490 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs; 491 bzero(sf.sf_uc.uc_mcontext.mc_fpregs, 492 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs)); 493 bzero(sf.sf_uc.uc_mcontext.__spare__, 494 sizeof(sf.sf_uc.uc_mcontext.__spare__)); 495 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__)); 496 497 /* Allocate space for the signal handler context. */ 498 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 499 SIGISMEMBER(psp->ps_sigonstack, sig)) { 500 sfp = (struct ia32_freebsd4_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 501 td->td_sigstk.ss_size - sizeof(sf)); 502 } else 503 sfp = (struct ia32_freebsd4_sigframe *)regs->tf_rsp - 1; 504 PROC_UNLOCK(p); 505 506 /* Build the argument list for the signal handler. */ 507 sf.sf_signum = sig; 508 sf.sf_ucontext = (register_t)&sfp->sf_uc; 509 bzero(&sf.sf_si, sizeof(sf.sf_si)); 510 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 511 /* Signal handler installed with SA_SIGINFO. */ 512 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si; 513 sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 514 515 /* Fill in POSIX parts */ 516 sf.sf_si = siginfo; 517 sf.sf_si.si_signo = sig; 518 } else { 519 /* Old FreeBSD-style arguments. */ 520 sf.sf_siginfo = siginfo.si_code; 521 sf.sf_addr = (u_int32_t)siginfo.si_addr; 522 sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 523 } 524 mtx_unlock(&psp->ps_mtx); 525 526 /* 527 * Copy the sigframe out to the user's stack. 528 */ 529 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 530 #ifdef DEBUG 531 printf("process %ld has trashed its stack\n", (long)p->p_pid); 532 #endif 533 PROC_LOCK(p); 534 sigexit(td, SIGILL); 535 } 536 537 regs->tf_rsp = (uintptr_t)sfp; 538 regs->tf_rip = PROC_SIGCODE(p) + 539 VDSO_FREEBSD4_IA32_SIGCODE_OFFSET - VDSO_IA32_SIGCODE_OFFSET; 540 regs->tf_rflags &= ~(PSL_T | PSL_D); 541 regs->tf_cs = _ucode32sel; 542 regs->tf_ss = _udatasel; 543 regs->tf_ds = _udatasel; 544 regs->tf_es = _udatasel; 545 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 546 /* leave user %fs and %gs untouched */ 547 PROC_LOCK(p); 548 mtx_lock(&psp->ps_mtx); 549 } 550 #endif /* COMPAT_FREEBSD4 */ 551 552 void 553 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 554 { 555 struct ia32_sigframe sf, *sfp; 556 struct siginfo32 siginfo; 557 struct proc *p; 558 struct thread *td; 559 struct sigacts *psp; 560 char *sp; 561 struct trapframe *regs; 562 char *xfpusave; 563 size_t xfpusave_len; 564 int oonstack; 565 int sig; 566 567 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo); 568 td = curthread; 569 p = td->td_proc; 570 PROC_LOCK_ASSERT(p, MA_OWNED); 571 sig = siginfo.si_signo; 572 psp = p->p_sigacts; 573 #ifdef COMPAT_FREEBSD4 574 if (SIGISMEMBER(psp->ps_freebsd4, sig)) { 575 freebsd4_ia32_sendsig(catcher, ksi, mask); 576 return; 577 } 578 #endif 579 #ifdef COMPAT_43 580 if (SIGISMEMBER(psp->ps_osigset, sig)) { 581 ia32_osendsig(catcher, ksi, mask); 582 return; 583 } 584 #endif 585 mtx_assert(&psp->ps_mtx, MA_OWNED); 586 regs = td->td_frame; 587 oonstack = sigonstack(regs->tf_rsp); 588 589 /* Save user context. */ 590 bzero(&sf, sizeof(sf)); 591 sf.sf_uc.uc_sigmask = *mask; 592 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp; 593 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 594 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 595 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 596 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 597 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi; 598 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi; 599 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp; 600 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */ 601 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx; 602 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx; 603 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx; 604 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax; 605 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno; 606 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err; 607 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip; 608 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs; 609 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags; 610 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp; 611 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss; 612 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds; 613 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es; 614 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs; 615 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs; 616 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ 617 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, &xfpusave, &xfpusave_len); 618 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase; 619 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase; 620 621 /* Allocate space for the signal handler context. */ 622 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 623 SIGISMEMBER(psp->ps_sigonstack, sig)) 624 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size; 625 else 626 sp = (char *)regs->tf_rsp; 627 if (xfpusave != NULL) { 628 sp -= xfpusave_len; 629 sp = (char *)((unsigned long)sp & ~0x3Ful); 630 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp; 631 } 632 sp -= sizeof(sf); 633 /* Align to 16 bytes. */ 634 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF); 635 PROC_UNLOCK(p); 636 637 /* Build the argument list for the signal handler. */ 638 sf.sf_signum = sig; 639 sf.sf_ucontext = (register_t)&sfp->sf_uc; 640 bzero(&sf.sf_si, sizeof(sf.sf_si)); 641 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 642 /* Signal handler installed with SA_SIGINFO. */ 643 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si; 644 sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 645 646 /* Fill in POSIX parts */ 647 sf.sf_si = siginfo; 648 sf.sf_si.si_signo = sig; 649 } else { 650 /* Old FreeBSD-style arguments. */ 651 sf.sf_siginfo = siginfo.si_code; 652 sf.sf_addr = (u_int32_t)siginfo.si_addr; 653 sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 654 } 655 mtx_unlock(&psp->ps_mtx); 656 657 /* 658 * Copy the sigframe out to the user's stack. 659 */ 660 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 || 661 (xfpusave != NULL && copyout(xfpusave, 662 PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len) 663 != 0)) { 664 #ifdef DEBUG 665 printf("process %ld has trashed its stack\n", (long)p->p_pid); 666 #endif 667 PROC_LOCK(p); 668 sigexit(td, SIGILL); 669 } 670 671 fpstate_drop(td); 672 regs->tf_rsp = (uintptr_t)sfp; 673 regs->tf_rip = PROC_SIGCODE(p); 674 regs->tf_rflags &= ~(PSL_T | PSL_D); 675 regs->tf_cs = _ucode32sel; 676 regs->tf_ss = _udatasel; 677 regs->tf_ds = _udatasel; 678 regs->tf_es = _udatasel; 679 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 680 /* XXXKIB leave user %fs and %gs untouched */ 681 PROC_LOCK(p); 682 mtx_lock(&psp->ps_mtx); 683 } 684 685 /* 686 * System call to cleanup state after a signal 687 * has been taken. Reset signal mask and 688 * stack state from context left by sendsig (above). 689 * Return to previous pc and psl as specified by 690 * context left by sendsig. Check carefully to 691 * make sure that the user has not modified the 692 * state to gain improper privileges. 693 */ 694 695 #ifdef COMPAT_43 696 int 697 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap) 698 { 699 struct ia32_osigcontext sc, *scp; 700 struct trapframe *regs; 701 int eflags, error; 702 ksiginfo_t ksi; 703 704 regs = td->td_frame; 705 error = copyin(uap->sigcntxp, &sc, sizeof(sc)); 706 if (error != 0) 707 return (error); 708 scp = ≻ 709 eflags = scp->sc_eflags; 710 if (!EFL_SECURE(eflags, regs->tf_rflags)) { 711 return (EINVAL); 712 } 713 if (!CS_SECURE(scp->sc_cs)) { 714 ksiginfo_init_trap(&ksi); 715 ksi.ksi_signo = SIGBUS; 716 ksi.ksi_code = BUS_OBJERR; 717 ksi.ksi_trapno = T_PROTFLT; 718 ksi.ksi_addr = (void *)regs->tf_rip; 719 trapsignal(td, &ksi); 720 return (EINVAL); 721 } 722 regs->tf_ds = scp->sc_ds; 723 regs->tf_es = scp->sc_es; 724 regs->tf_fs = scp->sc_fs; 725 regs->tf_gs = scp->sc_gs; 726 727 regs->tf_rax = scp->sc_eax; 728 regs->tf_rbx = scp->sc_ebx; 729 regs->tf_rcx = scp->sc_ecx; 730 regs->tf_rdx = scp->sc_edx; 731 regs->tf_rsi = scp->sc_esi; 732 regs->tf_rdi = scp->sc_edi; 733 regs->tf_cs = scp->sc_cs; 734 regs->tf_ss = scp->sc_ss; 735 regs->tf_rbp = scp->sc_ebp; 736 regs->tf_rsp = scp->sc_esp; 737 regs->tf_rip = scp->sc_eip; 738 regs->tf_rflags = eflags; 739 740 if (scp->sc_onstack & 1) 741 td->td_sigstk.ss_flags |= SS_ONSTACK; 742 else 743 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 744 745 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL, 746 SIGPROCMASK_OLD); 747 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 748 return (EJUSTRETURN); 749 } 750 #endif 751 752 #ifdef COMPAT_FREEBSD4 753 int 754 freebsd4_freebsd32_sigreturn(struct thread *td, 755 struct freebsd4_freebsd32_sigreturn_args *uap) 756 { 757 struct ia32_freebsd4_ucontext uc; 758 struct trapframe *regs; 759 struct ia32_freebsd4_ucontext *ucp; 760 int cs, eflags, error; 761 ksiginfo_t ksi; 762 763 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 764 if (error != 0) 765 return (error); 766 ucp = &uc; 767 regs = td->td_frame; 768 eflags = ucp->uc_mcontext.mc_eflags; 769 /* 770 * Don't allow users to change privileged or reserved flags. 771 */ 772 if (!EFL_SECURE(eflags, regs->tf_rflags)) { 773 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n", 774 td->td_proc->p_pid, td->td_name, eflags); 775 return (EINVAL); 776 } 777 778 /* 779 * Don't allow users to load a valid privileged %cs. Let the 780 * hardware check for invalid selectors, excess privilege in 781 * other selectors, invalid %eip's and invalid %esp's. 782 */ 783 cs = ucp->uc_mcontext.mc_cs; 784 if (!CS_SECURE(cs)) { 785 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n", 786 td->td_proc->p_pid, td->td_name, cs); 787 ksiginfo_init_trap(&ksi); 788 ksi.ksi_signo = SIGBUS; 789 ksi.ksi_code = BUS_OBJERR; 790 ksi.ksi_trapno = T_PROTFLT; 791 ksi.ksi_addr = (void *)regs->tf_rip; 792 trapsignal(td, &ksi); 793 return (EINVAL); 794 } 795 796 regs->tf_rdi = ucp->uc_mcontext.mc_edi; 797 regs->tf_rsi = ucp->uc_mcontext.mc_esi; 798 regs->tf_rbp = ucp->uc_mcontext.mc_ebp; 799 regs->tf_rbx = ucp->uc_mcontext.mc_ebx; 800 regs->tf_rdx = ucp->uc_mcontext.mc_edx; 801 regs->tf_rcx = ucp->uc_mcontext.mc_ecx; 802 regs->tf_rax = ucp->uc_mcontext.mc_eax; 803 regs->tf_trapno = ucp->uc_mcontext.mc_trapno; 804 regs->tf_err = ucp->uc_mcontext.mc_err; 805 regs->tf_rip = ucp->uc_mcontext.mc_eip; 806 regs->tf_cs = cs; 807 regs->tf_rflags = ucp->uc_mcontext.mc_eflags; 808 regs->tf_rsp = ucp->uc_mcontext.mc_esp; 809 regs->tf_ss = ucp->uc_mcontext.mc_ss; 810 regs->tf_ds = ucp->uc_mcontext.mc_ds; 811 regs->tf_es = ucp->uc_mcontext.mc_es; 812 regs->tf_fs = ucp->uc_mcontext.mc_fs; 813 regs->tf_gs = ucp->uc_mcontext.mc_gs; 814 815 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); 816 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 817 return (EJUSTRETURN); 818 } 819 #endif /* COMPAT_FREEBSD4 */ 820 821 int 822 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap) 823 { 824 struct ia32_ucontext uc; 825 struct trapframe *regs; 826 struct ia32_ucontext *ucp; 827 char *xfpustate; 828 size_t xfpustate_len; 829 int cs, eflags, error, ret; 830 ksiginfo_t ksi; 831 832 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 833 if (error != 0) 834 return (error); 835 ucp = &uc; 836 regs = td->td_frame; 837 eflags = ucp->uc_mcontext.mc_eflags; 838 /* 839 * Don't allow users to change privileged or reserved flags. 840 */ 841 if (!EFL_SECURE(eflags, regs->tf_rflags)) { 842 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n", 843 td->td_proc->p_pid, td->td_name, eflags); 844 return (EINVAL); 845 } 846 847 /* 848 * Don't allow users to load a valid privileged %cs. Let the 849 * hardware check for invalid selectors, excess privilege in 850 * other selectors, invalid %eip's and invalid %esp's. 851 */ 852 cs = ucp->uc_mcontext.mc_cs; 853 if (!CS_SECURE(cs)) { 854 uprintf("pid %d (%s): sigreturn cs = 0x%x\n", 855 td->td_proc->p_pid, td->td_name, cs); 856 ksiginfo_init_trap(&ksi); 857 ksi.ksi_signo = SIGBUS; 858 ksi.ksi_code = BUS_OBJERR; 859 ksi.ksi_trapno = T_PROTFLT; 860 ksi.ksi_addr = (void *)regs->tf_rip; 861 trapsignal(td, &ksi); 862 return (EINVAL); 863 } 864 865 if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) { 866 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len; 867 if (xfpustate_len > cpu_max_ext_state_size - 868 sizeof(struct savefpu)) { 869 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n", 870 td->td_proc->p_pid, td->td_name, xfpustate_len); 871 return (EINVAL); 872 } 873 xfpustate = (char *)fpu_save_area_alloc(); 874 error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate), 875 xfpustate, xfpustate_len); 876 if (error != 0) { 877 fpu_save_area_free((struct savefpu *)xfpustate); 878 uprintf( 879 "pid %d (%s): sigreturn copying xfpustate failed\n", 880 td->td_proc->p_pid, td->td_name); 881 return (error); 882 } 883 } else { 884 xfpustate = NULL; 885 xfpustate_len = 0; 886 } 887 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate, 888 xfpustate_len); 889 fpu_save_area_free((struct savefpu *)xfpustate); 890 if (ret != 0) { 891 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n", 892 td->td_proc->p_pid, td->td_name, ret); 893 return (ret); 894 } 895 896 regs->tf_rdi = ucp->uc_mcontext.mc_edi; 897 regs->tf_rsi = ucp->uc_mcontext.mc_esi; 898 regs->tf_rbp = ucp->uc_mcontext.mc_ebp; 899 regs->tf_rbx = ucp->uc_mcontext.mc_ebx; 900 regs->tf_rdx = ucp->uc_mcontext.mc_edx; 901 regs->tf_rcx = ucp->uc_mcontext.mc_ecx; 902 regs->tf_rax = ucp->uc_mcontext.mc_eax; 903 regs->tf_trapno = ucp->uc_mcontext.mc_trapno; 904 regs->tf_err = ucp->uc_mcontext.mc_err; 905 regs->tf_rip = ucp->uc_mcontext.mc_eip; 906 regs->tf_cs = cs; 907 regs->tf_rflags = ucp->uc_mcontext.mc_eflags; 908 regs->tf_rsp = ucp->uc_mcontext.mc_esp; 909 regs->tf_ss = ucp->uc_mcontext.mc_ss; 910 regs->tf_ds = ucp->uc_mcontext.mc_ds; 911 regs->tf_es = ucp->uc_mcontext.mc_es; 912 regs->tf_fs = ucp->uc_mcontext.mc_fs; 913 regs->tf_gs = ucp->uc_mcontext.mc_gs; 914 regs->tf_flags = TF_HASSEGS; 915 916 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); 917 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 918 return (EJUSTRETURN); 919 } 920 921 /* 922 * Clear registers on exec 923 */ 924 void 925 ia32_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack) 926 { 927 struct trapframe *regs; 928 struct pcb *pcb; 929 register_t saved_rflags; 930 931 regs = td->td_frame; 932 pcb = td->td_pcb; 933 934 if (td->td_proc->p_md.md_ldt != NULL) 935 user_ldt_free(td); 936 #ifdef COMPAT_43 937 setup_lcall_gate(); 938 #endif 939 940 pcb->pcb_fsbase = 0; 941 pcb->pcb_gsbase = 0; 942 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__; 943 944 saved_rflags = regs->tf_rflags & PSL_T; 945 bzero((char *)regs, sizeof(struct trapframe)); 946 regs->tf_rip = imgp->entry_addr; 947 regs->tf_rsp = stack; 948 regs->tf_rflags = PSL_USER | saved_rflags; 949 regs->tf_ss = _udatasel; 950 regs->tf_cs = _ucode32sel; 951 regs->tf_rbx = (register_t)imgp->ps_strings; 952 regs->tf_ds = _udatasel; 953 regs->tf_es = _udatasel; 954 regs->tf_fs = _ufssel; 955 regs->tf_gs = _ugssel; 956 regs->tf_flags = TF_HASSEGS; 957 958 x86_clear_dbregs(pcb); 959 960 fpstate_drop(td); 961 962 /* Return via doreti so that we can change to a different %cs */ 963 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 964 }
Cache object: c623e5a843362a197b4963a2f3dc8ff3
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