linux32_machdep.c revision 1.17.2.2
1 /* $NetBSD: linux32_machdep.c,v 1.17.2.2 2009/06/20 07:20:17 yamt 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 1.17.2.2 2009/06/20 07:20:17 yamt Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/signalvar.h> 39 #include <sys/kernel.h> 40 #include <sys/proc.h> 41 #include <sys/user.h> 42 #include <sys/buf.h> 43 #include <sys/reboot.h> 44 #include <sys/conf.h> 45 #include <sys/exec.h> 46 #include <sys/file.h> 47 #include <sys/callout.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/msgbuf.h> 51 #include <sys/mount.h> 52 #include <sys/vnode.h> 53 #include <sys/device.h> 54 #include <sys/syscallargs.h> 55 #include <sys/filedesc.h> 56 #include <sys/exec_elf.h> 57 #include <sys/disklabel.h> 58 #include <sys/ioctl.h> 59 #include <miscfs/specfs/specdev.h> 60 61 #include <machine/netbsd32_machdep.h> 62 63 #include <compat/netbsd32/netbsd32.h> 64 #include <compat/netbsd32/netbsd32_syscallargs.h> 65 66 #include <compat/linux/common/linux_signal.h> 67 #include <compat/linux/common/linux_errno.h> 68 69 #include <compat/linux32/common/linux32_types.h> 70 #include <compat/linux32/common/linux32_errno.h> 71 #include <compat/linux32/common/linux32_machdep.h> 72 #include <compat/linux32/common/linux32_signal.h> 73 #include <compat/linux32/common/linux32_exec.h> 74 #include <compat/linux32/linux32_syscallargs.h> 75 76 #include <sys/cpu.h> 77 #include <machine/cpufunc.h> 78 #include <machine/psl.h> 79 #include <machine/reg.h> 80 #include <machine/segments.h> 81 #include <machine/specialreg.h> 82 #include <machine/sysarch.h> 83 #include <machine/vmparam.h> 84 85 extern char linux32_sigcode[1]; 86 extern char linux32_rt_sigcode[1]; 87 extern char linux32_esigcode[1]; 88 89 extern void (osyscall_return)(void); 90 91 static void linux32_save_ucontext(struct lwp *, struct trapframe *, 92 const sigset_t *, struct sigaltstack *, struct linux32_ucontext *); 93 static void linux32_save_sigcontext(struct lwp *, struct trapframe *, 94 const sigset_t *, struct linux32_sigcontext *); 95 static void linux32_rt_sendsig(const ksiginfo_t *, const sigset_t *); 96 static void linux32_old_sendsig(const ksiginfo_t *, const sigset_t *); 97 static int linux32_restore_sigcontext(struct lwp *, 98 struct linux32_sigcontext *, register_t *); 99 100 void 101 linux32_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 102 { 103 if (SIGACTION(curproc, ksi->ksi_signo).sa_flags & SA_SIGINFO) 104 linux32_rt_sendsig(ksi, mask); 105 else 106 linux32_old_sendsig(ksi, mask); 107 return; 108 } 109 110 void 111 linux32_old_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 112 { 113 struct lwp *l = curlwp; 114 struct proc *p = l->l_proc; 115 struct trapframe *tf; 116 struct linux32_sigframe *fp, frame; 117 int onstack, error; 118 int sig = ksi->ksi_signo; 119 sig_t catcher = SIGACTION(p, sig).sa_handler; 120 struct sigaltstack *sas = &l->l_sigstk; 121 122 tf = l->l_md.md_regs; 123 /* Do we need to jump onto the signal stack? */ 124 onstack = (sas->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 125 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 126 127 128 /* Allocate space for the signal handler context. */ 129 if (onstack) 130 fp = (struct linux32_sigframe *)((char *)sas->ss_sp + 131 sas->ss_size); 132 else 133 fp = (struct linux32_sigframe *)tf->tf_rsp; 134 fp--; 135 136 /* Build stack frame for signal trampoline. */ 137 NETBSD32PTR32(frame.sf_handler, catcher); 138 frame.sf_sig = native_to_linux32_signo[sig]; 139 140 linux32_save_sigcontext(l, tf, mask, &frame.sf_sc); 141 142 sendsig_reset(l, sig); 143 mutex_exit(p->p_lock); 144 error = copyout(&frame, fp, sizeof(frame)); 145 mutex_enter(p->p_lock); 146 147 if (error != 0) { 148 /* 149 * Process has trashed its stack; give it an illegal 150 * instruction to halt it in its tracks. 151 */ 152 sigexit(l, SIGILL); 153 /* NOTREACHED */ 154 } 155 156 /* 157 * Build context to run handler in. 158 */ 159 tf->tf_gs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 160 tf->tf_fs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 161 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 162 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 163 tf->tf_rip = ((long)p->p_sigctx.ps_sigcode) & 0xffffffff; 164 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL) & 0xffffffff; 165 tf->tf_rflags &= ~PSL_CLEARSIG & 0xffffffff; 166 tf->tf_rsp = (long)fp & 0xffffffff; 167 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 168 169 /* Remember that we're now on the signal stack. */ 170 if (onstack) 171 sas->ss_flags |= SS_ONSTACK; 172 173 return; 174 } 175 176 void 177 linux32_rt_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 178 { 179 struct lwp *l = curlwp; 180 struct proc *p = l->l_proc; 181 struct trapframe *tf; 182 struct linux32_rt_sigframe *fp, frame; 183 int onstack, error; 184 linux32_siginfo_t *lsi; 185 int sig = ksi->ksi_signo; 186 sig_t catcher = SIGACTION(p, sig).sa_handler; 187 struct sigaltstack *sas = &l->l_sigstk; 188 189 tf = l->l_md.md_regs; 190 /* Do we need to jump onto the signal stack? */ 191 onstack = (sas->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 192 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 193 194 195 /* Allocate space for the signal handler context. */ 196 if (onstack) 197 fp = (struct linux32_rt_sigframe *)((char *)sas->ss_sp + 198 sas->ss_size); 199 else 200 fp = (struct linux32_rt_sigframe *)tf->tf_rsp; 201 fp--; 202 203 /* Build stack frame for signal trampoline. */ 204 NETBSD32PTR32(frame.sf_handler, catcher); 205 frame.sf_sig = native_to_linux32_signo[sig]; 206 NETBSD32PTR32(frame.sf_sip, &fp->sf_si); 207 NETBSD32PTR32(frame.sf_ucp, &fp->sf_uc); 208 209 lsi = &frame.sf_si; 210 (void)memset(lsi, 0, sizeof(frame.sf_si)); 211 lsi->lsi_errno = native_to_linux32_errno[ksi->ksi_errno]; 212 lsi->lsi_code = native_to_linux_si_code(ksi->ksi_code); 213 lsi->lsi_signo = frame.sf_sig; 214 switch (lsi->lsi_signo) { 215 case LINUX32_SIGILL: 216 case LINUX32_SIGFPE: 217 case LINUX32_SIGSEGV: 218 case LINUX32_SIGBUS: 219 case LINUX32_SIGTRAP: 220 NETBSD32PTR32(lsi->lsi_addr, ksi->ksi_addr); 221 break; 222 case LINUX32_SIGCHLD: 223 lsi->lsi_uid = ksi->ksi_uid; 224 lsi->lsi_pid = ksi->ksi_pid; 225 lsi->lsi_utime = ksi->ksi_utime; 226 lsi->lsi_stime = ksi->ksi_stime; 227 lsi->lsi_status = native_to_linux_si_status(ksi->ksi_code, 228 ksi->ksi_status); 229 break; 230 case LINUX32_SIGIO: 231 lsi->lsi_band = ksi->ksi_band; 232 lsi->lsi_fd = ksi->ksi_fd; 233 break; 234 default: 235 lsi->lsi_uid = ksi->ksi_uid; 236 lsi->lsi_pid = ksi->ksi_pid; 237 if (lsi->lsi_signo == LINUX32_SIGALRM || 238 lsi->lsi_signo >= LINUX32_SIGRTMIN) 239 NETBSD32PTR32(lsi->lsi_value.sival_ptr, 240 ksi->ksi_value.sival_ptr); 241 break; 242 } 243 244 /* Save register context. */ 245 linux32_save_ucontext(l, tf, mask, sas, &frame.sf_uc); 246 sendsig_reset(l, sig); 247 mutex_exit(p->p_lock); 248 error = copyout(&frame, fp, sizeof(frame)); 249 mutex_enter(p->p_lock); 250 251 if (error != 0) { 252 /* 253 * Process has trashed its stack; give it an illegal 254 * instruction to halt it in its tracks. 255 */ 256 sigexit(l, SIGILL); 257 /* NOTREACHED */ 258 } 259 260 /* 261 * Build context to run handler in. 262 */ 263 tf->tf_gs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 264 tf->tf_fs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 265 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 266 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 267 tf->tf_rip = (((long)p->p_sigctx.ps_sigcode) + 268 (linux32_rt_sigcode - linux32_sigcode)) & 0xffffffff; 269 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL) & 0xffffffff; 270 tf->tf_rflags &= ~PSL_CLEARSIG & 0xffffffff; 271 tf->tf_rsp = (long)fp & 0xffffffff; 272 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 273 274 /* Remember that we're now on the signal stack. */ 275 if (onstack) 276 sas->ss_flags |= SS_ONSTACK; 277 278 return; 279 } 280 281 void 282 linux32_setregs(struct lwp *l, struct exec_package *pack, u_long stack) 283 { 284 struct pcb *pcb = &l->l_addr->u_pcb; 285 struct trapframe *tf; 286 struct proc *p = l->l_proc; 287 void **retaddr; 288 289 /* If we were using the FPU, forget about it. */ 290 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 291 fpusave_lwp(l, 0); 292 293 #if defined(USER_LDT) && 0 294 pmap_ldt_cleanup(p); 295 #endif 296 297 netbsd32_adjust_limits(p); 298 299 l->l_md.md_flags &= ~MDP_USEDFPU; 300 pcb->pcb_flags = 0; 301 pcb->pcb_savefpu.fp_fxsave.fx_fcw = __Linux_NPXCW__; 302 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr = __INITIAL_MXCSR__; 303 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr_mask = __INITIAL_MXCSR_MASK__; 304 pcb->pcb_fs = 0; 305 pcb->pcb_gs = 0; 306 307 308 p->p_flag |= PK_32; 309 310 tf = l->l_md.md_regs; 311 tf->tf_rax = 0; 312 tf->tf_rbx = (u_int64_t)p->p_psstr & 0xffffffff; 313 tf->tf_rcx = pack->ep_entry & 0xffffffff; 314 tf->tf_rdx = 0; 315 tf->tf_rsi = 0; 316 tf->tf_rdi = 0; 317 tf->tf_rbp = 0; 318 tf->tf_rsp = stack & 0xffffffff; 319 tf->tf_r8 = 0; 320 tf->tf_r9 = 0; 321 tf->tf_r10 = 0; 322 tf->tf_r11 = 0; 323 tf->tf_r12 = 0; 324 tf->tf_r13 = 0; 325 tf->tf_r14 = 0; 326 tf->tf_r15 = 0; 327 tf->tf_rip = pack->ep_entry & 0xffffffff; 328 tf->tf_rflags = PSL_USERSET; 329 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL) & 0xffffffff; 330 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 331 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 332 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 333 tf->tf_fs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 334 tf->tf_gs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 335 336 /* XXX frob return address to return via old iret method, not sysret */ 337 retaddr = (void **)tf - 1; 338 *retaddr = (void *)osyscall_return; 339 return; 340 } 341 342 static void 343 linux32_save_ucontext(struct lwp *l, struct trapframe *tf, const sigset_t *mask, struct sigaltstack *sas, struct linux32_ucontext *uc) 344 { 345 uc->uc_flags = 0; 346 NETBSD32PTR32(uc->uc_link, NULL); 347 native_to_linux32_sigaltstack(&uc->uc_stack, sas); 348 linux32_save_sigcontext(l, tf, mask, &uc->uc_mcontext); 349 native_to_linux32_sigset(&uc->uc_sigmask, mask); 350 (void)memset(&uc->uc_fpregs_mem, 0, sizeof(uc->uc_fpregs_mem)); 351 } 352 353 static void 354 linux32_save_sigcontext(struct lwp *l, struct trapframe *tf, 355 const sigset_t *mask, struct linux32_sigcontext *sc) 356 { 357 /* Save register context. */ 358 sc->sc_gs = tf->tf_gs; 359 sc->sc_fs = tf->tf_fs; 360 sc->sc_es = tf->tf_es; 361 sc->sc_ds = tf->tf_ds; 362 sc->sc_eflags = tf->tf_rflags; 363 sc->sc_edi = tf->tf_rdi; 364 sc->sc_esi = tf->tf_rsi; 365 sc->sc_esp = tf->tf_rsp; 366 sc->sc_ebp = tf->tf_rbp; 367 sc->sc_ebx = tf->tf_rbx; 368 sc->sc_edx = tf->tf_rdx; 369 sc->sc_ecx = tf->tf_rcx; 370 sc->sc_eax = tf->tf_rax; 371 sc->sc_eip = tf->tf_rip; 372 sc->sc_cs = tf->tf_cs; 373 sc->sc_esp_at_signal = tf->tf_rsp; 374 sc->sc_ss = tf->tf_ss; 375 sc->sc_err = tf->tf_err; 376 sc->sc_trapno = tf->tf_trapno; 377 sc->sc_cr2 = l->l_addr->u_pcb.pcb_cr2; 378 NETBSD32PTR32(sc->sc_387, NULL); 379 380 /* Save signal stack. */ 381 /* Linux doesn't save the onstack flag in sigframe */ 382 383 /* Save signal mask. */ 384 native_to_linux32_old_sigset(&sc->sc_mask, mask); 385 } 386 387 int 388 linux32_sys_sigreturn(struct lwp *l, const struct linux32_sys_sigreturn_args *uap, register_t *retval) 389 { 390 /* { 391 syscallarg(linux32_sigcontextp_t) scp; 392 } */ 393 struct linux32_sigcontext ctx; 394 int error; 395 396 if ((error = copyin(SCARG_P32(uap, scp), &ctx, sizeof(ctx))) != 0) 397 return error; 398 399 return linux32_restore_sigcontext(l, &ctx, retval); 400 } 401 402 int 403 linux32_sys_rt_sigreturn(struct lwp *l, const struct linux32_sys_rt_sigreturn_args *uap, register_t *retval) 404 { 405 /* { 406 syscallarg(linux32_ucontextp_t) ucp; 407 } */ 408 struct linux32_ucontext ctx; 409 int error; 410 411 if ((error = copyin(SCARG_P32(uap, ucp), &ctx, sizeof(ctx))) != 0) 412 return error; 413 414 return linux32_restore_sigcontext(l, &ctx.uc_mcontext, retval); 415 } 416 417 static int 418 linux32_restore_sigcontext(struct lwp *l, struct linux32_sigcontext *scp, 419 register_t *retval) 420 { 421 struct trapframe *tf; 422 struct proc *p = l->l_proc; 423 struct sigaltstack *sas = &l->l_sigstk; 424 sigset_t mask; 425 ssize_t ss_gap; 426 427 /* Restore register context. */ 428 tf = l->l_md.md_regs; 429 430 /* 431 * Check for security violations. If we're returning to 432 * protected mode, the CPU will validate the segment registers 433 * automatically and generate a trap on violations. We handle 434 * the trap, rather than doing all of the checking here. 435 */ 436 if (((scp->sc_eflags ^ tf->tf_rflags) & PSL_USERSTATIC) != 0 || 437 !USERMODE(scp->sc_cs, scp->sc_eflags)) 438 return EINVAL; 439 440 if (scp->sc_fs != 0 && !VALID_USER_DSEL32(scp->sc_fs)) 441 return EINVAL; 442 443 if (scp->sc_gs != 0 && !VALID_USER_DSEL32(scp->sc_gs)) 444 return EINVAL; 445 446 if (scp->sc_es != 0 && !VALID_USER_DSEL32(scp->sc_es)) 447 return EINVAL; 448 449 if (!VALID_USER_DSEL32(scp->sc_ds) || 450 !VALID_USER_DSEL32(scp->sc_ss)) 451 return EINVAL; 452 453 if (scp->sc_eip >= VM_MAXUSER_ADDRESS32) 454 return EINVAL; 455 456 tf->tf_gs = (register_t)scp->sc_gs & 0xffffffff; 457 tf->tf_fs = (register_t)scp->sc_fs & 0xffffffff; 458 tf->tf_es = (register_t)scp->sc_es & 0xffffffff; 459 tf->tf_ds = (register_t)scp->sc_ds & 0xffffffff; 460 tf->tf_rflags &= ~PSL_USER; 461 tf->tf_rflags |= ((register_t)scp->sc_eflags & PSL_USER); 462 tf->tf_rdi = (register_t)scp->sc_edi & 0xffffffff; 463 tf->tf_rsi = (register_t)scp->sc_esi & 0xffffffff; 464 tf->tf_rbp = (register_t)scp->sc_ebp & 0xffffffff; 465 tf->tf_rbx = (register_t)scp->sc_ebx & 0xffffffff; 466 tf->tf_rdx = (register_t)scp->sc_edx & 0xffffffff; 467 tf->tf_rcx = (register_t)scp->sc_ecx & 0xffffffff; 468 tf->tf_rax = (register_t)scp->sc_eax & 0xffffffff; 469 tf->tf_rip = (register_t)scp->sc_eip & 0xffffffff; 470 tf->tf_cs = (register_t)scp->sc_cs & 0xffffffff; 471 tf->tf_rsp = (register_t)scp->sc_esp_at_signal & 0xffffffff; 472 tf->tf_ss = (register_t)scp->sc_ss & 0xffffffff; 473 474 mutex_enter(p->p_lock); 475 476 /* Restore signal stack. */ 477 ss_gap = (ssize_t) 478 ((char *)NETBSD32IPTR64(scp->sc_esp_at_signal) 479 - (char *)sas->ss_sp); 480 if (ss_gap >= 0 && ss_gap < sas->ss_size) 481 sas->ss_flags |= SS_ONSTACK; 482 else 483 sas->ss_flags &= ~SS_ONSTACK; 484 485 /* Restore signal mask. */ 486 linux32_old_to_native_sigset(&mask, &scp->sc_mask); 487 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 488 489 mutex_exit(p->p_lock); 490 491 #ifdef DEBUG_LINUX 492 printf("linux32_sigreturn: rip = 0x%lx, rsp = 0x%lx, flags = 0x%lx\n", 493 tf->tf_rip, tf->tf_rsp, tf->tf_rflags); 494 #endif 495 return EJUSTRETURN; 496 } 497
Indexes created Thu Oct 23 22:10:10 GMT 2025