1 /* $NetBSD: linux32_machdep.c,v 1.43 2017/10/21 07:24:26 maxv Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Emmanuel Dreyfus, 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 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Emmanuel Dreyfus 17 * 4. The name of the author may not be used to endorse or promote 18 * products derived from this software without specific prior written 19 * permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS'' 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: linux32_machdep.c,v 1.43 2017/10/21 07:24:26 maxv Exp $"); 35 36 #if defined(_KERNEL_OPT) 37 #include "opt_user_ldt.h" 38 #endif 39 40 #include <sys/param.h> 41 #include <sys/proc.h> 42 #include <sys/exec.h> 43 44 #include <machine/vmparam.h> 45 #include <machine/cpufunc.h> 46 #include <machine/netbsd32_machdep.h> 47 48 #include <x86/fpu.h> 49 50 #include <compat/netbsd32/netbsd32.h> 51 #include <compat/netbsd32/netbsd32_syscallargs.h> 52 53 #include <compat/linux/common/linux_types.h> 54 #include <compat/linux/common/linux_emuldata.h> 55 #include <compat/linux/common/linux_signal.h> 56 #include <compat/linux/common/linux_errno.h> 57 #include <compat/linux/common/linux_exec.h> 58 #include <compat/linux/common/linux_ipc.h> 59 #include <compat/linux/common/linux_sem.h> 60 #include <compat/linux/linux_syscallargs.h> 61 62 #include <compat/linux32/common/linux32_types.h> 63 #include <compat/linux32/common/linux32_errno.h> 64 #include <compat/linux32/common/linux32_machdep.h> 65 #include <compat/linux32/common/linux32_signal.h> 66 #include <compat/linux32/common/linux32_exec.h> 67 #include <compat/linux32/common/linux32_ipc.h> 68 #include <compat/linux32/common/linux32_sem.h> 69 #include <compat/linux32/linux32_syscallargs.h> 70 71 #ifdef DEBUG_LINUX 72 #define DPRINTF(a) uprintf a 73 #else 74 #define DPRINTF(a) 75 #endif 76 77 extern char linux32_sigcode[]; 78 extern char linux32_rt_sigcode[]; 79 extern char linux32_esigcode[]; 80 81 static void linux32_save_ucontext(struct lwp *, struct trapframe *, 82 const sigset_t *, struct sigaltstack *, struct linux32_ucontext *); 83 static void linux32_save_sigcontext(struct lwp *, struct trapframe *, 84 const sigset_t *, struct linux32_sigcontext *); 85 static void linux32_rt_sendsig(const ksiginfo_t *, const sigset_t *); 86 static void linux32_old_sendsig(const ksiginfo_t *, const sigset_t *); 87 static int linux32_restore_sigcontext(struct lwp *, 88 struct linux32_sigcontext *, register_t *); 89 90 void 91 linux32_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 92 { 93 if (SIGACTION(curproc, ksi->ksi_signo).sa_flags & SA_SIGINFO) 94 linux32_rt_sendsig(ksi, mask); 95 else 96 linux32_old_sendsig(ksi, mask); 97 return; 98 } 99 100 void 101 linux32_old_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 102 { 103 struct lwp *l = curlwp; 104 struct proc *p = l->l_proc; 105 struct trapframe *tf; 106 struct linux32_sigframe *fp, frame; 107 int onstack, error; 108 int sig = ksi->ksi_signo; 109 sig_t catcher = SIGACTION(p, sig).sa_handler; 110 struct sigaltstack *sas = &l->l_sigstk; 111 112 tf = l->l_md.md_regs; 113 /* Do we need to jump onto the signal stack? */ 114 onstack = (sas->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 115 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 116 117 118 /* Allocate space for the signal handler context. */ 119 if (onstack) 120 fp = (struct linux32_sigframe *)((char *)sas->ss_sp + 121 sas->ss_size); 122 else 123 fp = (struct linux32_sigframe *)tf->tf_rsp; 124 fp--; 125 126 DPRINTF(("old: onstack = %d, fp = %p sig = %d rip = 0x%lx\n", 127 onstack, fp, sig, tf->tf_rip)); 128 129 /* Build stack frame for signal trampoline. */ 130 NETBSD32PTR32(frame.sf_handler, catcher); 131 frame.sf_sig = native_to_linux32_signo[sig]; 132 133 linux32_save_sigcontext(l, tf, mask, &frame.sf_sc); 134 135 sendsig_reset(l, sig); 136 mutex_exit(p->p_lock); 137 error = copyout(&frame, fp, sizeof(frame)); 138 mutex_enter(p->p_lock); 139 140 if (error != 0) { 141 /* 142 * Process has trashed its stack; give it an illegal 143 * instruction to halt it in its tracks. 144 */ 145 sigexit(l, SIGILL); 146 /* NOTREACHED */ 147 } 148 149 /* 150 * Build context to run handler in. 151 */ 152 tf->tf_fs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 153 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 154 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 155 tf->tf_rip = ((long)p->p_sigctx.ps_sigcode) & 0xffffffff; 156 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL) & 0xffffffff; 157 tf->tf_rflags &= ~PSL_CLEARSIG & 0xffffffff; 158 tf->tf_rsp = (long)fp & 0xffffffff; 159 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 160 161 /* Remember that we're now on the signal stack. */ 162 if (onstack) 163 sas->ss_flags |= SS_ONSTACK; 164 165 return; 166 } 167 168 void 169 linux32_rt_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 170 { 171 struct lwp *l = curlwp; 172 struct proc *p = l->l_proc; 173 struct trapframe *tf; 174 struct linux32_rt_sigframe *fp, frame; 175 int onstack, error; 176 linux32_siginfo_t *lsi; 177 int sig = ksi->ksi_signo; 178 sig_t catcher = SIGACTION(p, sig).sa_handler; 179 struct sigaltstack *sas = &l->l_sigstk; 180 181 tf = l->l_md.md_regs; 182 /* Do we need to jump onto the signal stack? */ 183 onstack = (sas->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 184 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 185 186 187 /* Allocate space for the signal handler context. */ 188 if (onstack) 189 fp = (struct linux32_rt_sigframe *)((char *)sas->ss_sp + 190 sas->ss_size); 191 else 192 fp = (struct linux32_rt_sigframe *)tf->tf_rsp; 193 fp--; 194 195 /* Build stack frame for signal trampoline. */ 196 NETBSD32PTR32(frame.sf_handler, catcher); 197 frame.sf_sig = native_to_linux32_signo[sig]; 198 NETBSD32PTR32(frame.sf_sip, &fp->sf_si); 199 NETBSD32PTR32(frame.sf_ucp, &fp->sf_uc); 200 201 DPRINTF(("rt: onstack = %d, fp = %p sig = %d rip = 0x%lx\n", 202 onstack, fp, sig, tf->tf_rip)); 203 204 lsi = &frame.sf_si; 205 (void)memset(lsi, 0, sizeof(frame.sf_si)); 206 lsi->lsi_errno = native_to_linux32_errno[ksi->ksi_errno]; 207 lsi->lsi_code = native_to_linux_si_code(ksi->ksi_code); 208 lsi->lsi_signo = frame.sf_sig; 209 switch (lsi->lsi_signo) { 210 case LINUX32_SIGILL: 211 case LINUX32_SIGFPE: 212 case LINUX32_SIGSEGV: 213 case LINUX32_SIGBUS: 214 case LINUX32_SIGTRAP: 215 NETBSD32PTR32(lsi->lsi_addr, ksi->ksi_addr); 216 break; 217 case LINUX32_SIGCHLD: 218 lsi->lsi_uid = ksi->ksi_uid; 219 lsi->lsi_pid = ksi->ksi_pid; 220 lsi->lsi_utime = ksi->ksi_utime; 221 lsi->lsi_stime = ksi->ksi_stime; 222 lsi->lsi_status = native_to_linux_si_status(ksi->ksi_code, 223 ksi->ksi_status); 224 break; 225 case LINUX32_SIGIO: 226 lsi->lsi_band = ksi->ksi_band; 227 lsi->lsi_fd = ksi->ksi_fd; 228 break; 229 default: 230 lsi->lsi_uid = ksi->ksi_uid; 231 lsi->lsi_pid = ksi->ksi_pid; 232 if (lsi->lsi_signo == LINUX32_SIGALRM || 233 lsi->lsi_signo >= LINUX32_SIGRTMIN) 234 NETBSD32PTR32(lsi->lsi_value.sival_ptr, 235 ksi->ksi_value.sival_ptr); 236 break; 237 } 238 239 /* Save register context. */ 240 linux32_save_ucontext(l, tf, mask, sas, &frame.sf_uc); 241 sendsig_reset(l, sig); 242 mutex_exit(p->p_lock); 243 error = copyout(&frame, fp, sizeof(frame)); 244 mutex_enter(p->p_lock); 245 246 if (error != 0) { 247 /* 248 * Process has trashed its stack; give it an illegal 249 * instruction to halt it in its tracks. 250 */ 251 sigexit(l, SIGILL); 252 /* NOTREACHED */ 253 } 254 255 /* 256 * Build context to run handler in. 257 */ 258 tf->tf_fs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 259 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 260 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 261 tf->tf_rip = (((long)p->p_sigctx.ps_sigcode) + 262 (linux32_rt_sigcode - linux32_sigcode)) & 0xffffffff; 263 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL) & 0xffffffff; 264 tf->tf_rflags &= ~PSL_CLEARSIG & 0xffffffff; 265 tf->tf_rsp = (long)fp & 0xffffffff; 266 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 267 268 /* Remember that we're now on the signal stack. */ 269 if (onstack) 270 sas->ss_flags |= SS_ONSTACK; 271 272 return; 273 } 274 275 void 276 linux32_setregs(struct lwp *l, struct exec_package *pack, u_long stack) 277 { 278 struct pcb *pcb = lwp_getpcb(l); 279 struct trapframe *tf; 280 struct proc *p = l->l_proc; 281 282 #if defined(USER_LDT) 283 pmap_ldt_cleanup(l); 284 #endif 285 286 netbsd32_adjust_limits(p); 287 288 fpu_save_area_clear(l, __Linux_NPXCW__); 289 290 l->l_md.md_flags = MDL_COMPAT32; /* Forces iret not sysret */ 291 pcb->pcb_flags = PCB_COMPAT32; 292 293 p->p_flag |= PK_32; 294 295 tf = l->l_md.md_regs; 296 tf->tf_rax = 0; 297 tf->tf_rbx = (u_int32_t)p->p_psstrp; 298 tf->tf_rcx = pack->ep_entry & 0xffffffff; 299 tf->tf_rdx = 0; 300 tf->tf_rsi = 0; 301 tf->tf_rdi = 0; 302 tf->tf_rbp = 0; 303 tf->tf_rsp = stack & 0xffffffff; 304 tf->tf_r8 = 0; 305 tf->tf_r9 = 0; 306 tf->tf_r10 = 0; 307 tf->tf_r11 = 0; 308 tf->tf_r12 = 0; 309 tf->tf_r13 = 0; 310 tf->tf_r14 = 0; 311 tf->tf_r15 = 0; 312 tf->tf_rip = pack->ep_entry & 0xffffffff; 313 tf->tf_rflags = PSL_USERSET; 314 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL); 315 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL); 316 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL); 317 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL); 318 cpu_segregs32_zero(l); 319 cpu_fsgs_reload(l, GSEL(GUDATA32_SEL, SEL_UPL), GSEL(GUDATA32_SEL, SEL_UPL)); 320 } 321 322 static void 323 linux32_save_ucontext(struct lwp *l, struct trapframe *tf, 324 const sigset_t *mask, struct sigaltstack *sas, struct linux32_ucontext *uc) 325 { 326 327 uc->uc_flags = 0; 328 NETBSD32PTR32(uc->uc_link, NULL); 329 native_to_linux32_sigaltstack(&uc->uc_stack, sas); 330 linux32_save_sigcontext(l, tf, mask, &uc->uc_mcontext); 331 native_to_linux32_sigset(&uc->uc_sigmask, mask); 332 (void)memset(&uc->uc_fpregs_mem, 0, sizeof(uc->uc_fpregs_mem)); 333 } 334 335 static void 336 linux32_save_sigcontext(struct lwp *l, struct trapframe *tf, 337 const sigset_t *mask, struct linux32_sigcontext *sc) 338 { 339 struct pcb *pcb = lwp_getpcb(l); 340 341 /* Save register context. */ 342 sc->sc_gs = tf->tf_gs & 0xFFFF; 343 sc->sc_fs = tf->tf_fs & 0xFFFF; 344 sc->sc_es = tf->tf_es & 0xFFFF; 345 sc->sc_ds = tf->tf_ds & 0xFFFF; 346 sc->sc_eflags = tf->tf_rflags; 347 sc->sc_edi = tf->tf_rdi; 348 sc->sc_esi = tf->tf_rsi; 349 sc->sc_esp = tf->tf_rsp; 350 sc->sc_ebp = tf->tf_rbp; 351 sc->sc_ebx = tf->tf_rbx; 352 sc->sc_edx = tf->tf_rdx; 353 sc->sc_ecx = tf->tf_rcx; 354 sc->sc_eax = tf->tf_rax; 355 sc->sc_eip = tf->tf_rip; 356 sc->sc_cs = tf->tf_cs & 0xFFFF; 357 sc->sc_esp_at_signal = tf->tf_rsp; 358 sc->sc_ss = tf->tf_ss & 0xFFFF; 359 sc->sc_err = tf->tf_err; 360 sc->sc_trapno = tf->tf_trapno; 361 sc->sc_cr2 = pcb->pcb_cr2; 362 NETBSD32PTR32(sc->sc_387, NULL); 363 364 /* Save signal stack. */ 365 /* Linux doesn't save the onstack flag in sigframe */ 366 367 /* Save signal mask. */ 368 native_to_linux32_old_sigset(&sc->sc_mask, mask); 369 } 370 371 int 372 linux32_sys_sigreturn(struct lwp *l, 373 const struct linux32_sys_sigreturn_args *uap, register_t *retval) 374 { 375 /* { 376 syscallarg(linux32_sigcontextp_t) scp; 377 } */ 378 struct linux32_sigcontext ctx; 379 int error; 380 381 if ((error = copyin(SCARG_P32(uap, scp), &ctx, sizeof(ctx))) != 0) 382 return error; 383 384 return linux32_restore_sigcontext(l, &ctx, retval); 385 } 386 387 int 388 linux32_sys_rt_sigreturn(struct lwp *l, 389 const struct linux32_sys_rt_sigreturn_args *uap, register_t *retval) 390 { 391 /* { 392 syscallarg(linux32_ucontextp_t) ucp; 393 } */ 394 struct linux32_ucontext ctx; 395 int error; 396 397 if ((error = copyin(SCARG_P32(uap, ucp), &ctx, sizeof(ctx))) != 0) 398 return error; 399 400 return linux32_restore_sigcontext(l, &ctx.uc_mcontext, retval); 401 } 402 403 static int 404 linux32_restore_sigcontext(struct lwp *l, struct linux32_sigcontext *scp, 405 register_t *retval) 406 { 407 struct trapframe *tf; 408 struct proc *p = l->l_proc; 409 struct sigaltstack *sas = &l->l_sigstk; 410 struct pcb *pcb; 411 sigset_t mask; 412 ssize_t ss_gap; 413 register_t fssel, gssel; 414 415 /* Restore register context. */ 416 tf = l->l_md.md_regs; 417 pcb = lwp_getpcb(l); 418 DPRINTF(("sigreturn enter rsp=0x%lx rip=0x%lx\n", tf->tf_rsp, 419 tf->tf_rip)); 420 421 /* 422 * Check for security violations. 423 */ 424 if (((scp->sc_eflags ^ tf->tf_rflags) & PSL_USERSTATIC) != 0) 425 return EINVAL; 426 if (!VALID_USER_CSEL32(scp->sc_cs)) 427 return EINVAL; 428 429 if (scp->sc_fs != 0 && !VALID_USER_DSEL32(scp->sc_fs) && 430 !(VALID_USER_FSEL32(scp->sc_fs) && pcb->pcb_fs != 0)) 431 return EINVAL; 432 433 if (scp->sc_gs != 0 && !VALID_USER_DSEL32(scp->sc_gs) && 434 !(VALID_USER_GSEL32(scp->sc_gs) && pcb->pcb_gs != 0)) 435 return EINVAL; 436 437 if (scp->sc_es != 0 && !VALID_USER_DSEL32(scp->sc_es)) 438 return EINVAL; 439 440 if (!VALID_USER_DSEL32(scp->sc_ds) || 441 !VALID_USER_DSEL32(scp->sc_ss)) 442 return EINVAL; 443 444 if (scp->sc_eip >= VM_MAXUSER_ADDRESS32) 445 return EINVAL; 446 447 gssel = (register_t)scp->sc_gs & 0xffff; 448 fssel = (register_t)scp->sc_fs & 0xffff; 449 cpu_fsgs_reload(l, fssel, gssel); 450 tf->tf_es = (register_t)scp->sc_es & 0xffff; 451 tf->tf_ds = (register_t)scp->sc_ds & 0xffff; 452 tf->tf_rflags &= ~PSL_USER; 453 tf->tf_rflags |= ((register_t)scp->sc_eflags & PSL_USER); 454 tf->tf_rdi = (register_t)scp->sc_edi & 0xffffffff; 455 tf->tf_rsi = (register_t)scp->sc_esi & 0xffffffff; 456 tf->tf_rbp = (register_t)scp->sc_ebp & 0xffffffff; 457 tf->tf_rbx = (register_t)scp->sc_ebx & 0xffffffff; 458 tf->tf_rdx = (register_t)scp->sc_edx & 0xffffffff; 459 tf->tf_rcx = (register_t)scp->sc_ecx & 0xffffffff; 460 tf->tf_rax = (register_t)scp->sc_eax & 0xffffffff; 461 tf->tf_rip = (register_t)scp->sc_eip & 0xffffffff; 462 tf->tf_cs = (register_t)scp->sc_cs & 0xffff; 463 tf->tf_rsp = (register_t)scp->sc_esp_at_signal & 0xffffffff; 464 tf->tf_ss = (register_t)scp->sc_ss & 0xffff; 465 466 mutex_enter(p->p_lock); 467 468 /* Restore signal stack. */ 469 ss_gap = (ssize_t) 470 ((char *)NETBSD32IPTR64(scp->sc_esp_at_signal) 471 - (char *)sas->ss_sp); 472 if (ss_gap >= 0 && ss_gap < sas->ss_size) 473 sas->ss_flags |= SS_ONSTACK; 474 else 475 sas->ss_flags &= ~SS_ONSTACK; 476 477 /* Restore signal mask. */ 478 linux32_old_to_native_sigset(&mask, &scp->sc_mask); 479 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 480 481 mutex_exit(p->p_lock); 482 483 DPRINTF(("linux32_sigreturn: rip = 0x%lx, rsp = 0x%lx, flags = 0x%lx\n", 484 tf->tf_rip, tf->tf_rsp, tf->tf_rflags)); 485 return EJUSTRETURN; 486 } 487 488 int 489 linux32_sys_set_thread_area(struct lwp *l, 490 const struct linux32_sys_set_thread_area_args *uap, register_t *retval) 491 { 492 /* { 493 syscallarg(linux32_user_descp_t) desc; 494 } */ 495 496 return linux_lwp_setprivate(l, SCARG_P32(uap, desc)); 497 } 498 499 int 500 linux32_sys_get_thread_area(struct lwp *l, 501 const struct linux32_sys_get_thread_area_args *uap, register_t *retval) 502 { 503 /* { 504 syscallarg(linux32_user_descp_t) desc; 505 } */ 506 507 /* glibc doesn't actually call this. */ 508 return ENOSYS; 509 } 510 511 int 512 linux32_sys_modify_ldt(struct lwp *l, const struct linux32_sys_modify_ldt_args *uap, register_t *retval) 513 { 514 /* { 515 syscallarg(int) func; 516 syscallarg(netbsd32_charp) ptr; 517 syscallarg(netbsd32_size_t) bytecount; 518 } */ 519 struct linux_sys_modify_ldt_args ua; 520 521 NETBSD32TO64_UAP(func); 522 NETBSD32TOP_UAP(ptr, void *); 523 NETBSD32TOX_UAP(bytecount, size_t); 524 return linux_sys_modify_ldt(l, &ua, retval); 525 } 526