linux32_machdep.c revision 1.17.4.1
1 /* $NetBSD: linux32_machdep.c,v 1.17.4.1 2008/05/10 23:48:56 wrstuden 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 1.17.4.1 2008/05/10 23:48:56 wrstuden 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/sa.h> 55 #include <sys/syscallargs.h> 56 #include <sys/filedesc.h> 57 #include <sys/exec_elf.h> 58 #include <sys/disklabel.h> 59 #include <sys/ioctl.h> 60 #include <sys/wait.h> 61 #include <miscfs/specfs/specdev.h> 62 63 #include <machine/netbsd32_machdep.h> 64 65 #include <compat/netbsd32/netbsd32.h> 66 #include <compat/netbsd32/netbsd32_syscallargs.h> 67 68 #include <compat/linux/common/linux_signal.h> 69 #include <compat/linux/common/linux_errno.h> 70 71 #include <compat/linux32/common/linux32_types.h> 72 #include <compat/linux32/common/linux32_errno.h> 73 #include <compat/linux32/common/linux32_machdep.h> 74 #include <compat/linux32/common/linux32_signal.h> 75 #include <compat/linux32/common/linux32_exec.h> 76 #include <compat/linux32/linux32_syscallargs.h> 77 78 #include <sys/cpu.h> 79 #include <machine/cpufunc.h> 80 #include <machine/psl.h> 81 #include <machine/reg.h> 82 #include <machine/segments.h> 83 #include <machine/specialreg.h> 84 #include <machine/sysarch.h> 85 #include <machine/vmparam.h> 86 87 extern char linux32_sigcode[1]; 88 extern char linux32_rt_sigcode[1]; 89 extern char linux32_esigcode[1]; 90 91 extern void (osyscall_return)(void); 92 93 static void linux32_save_ucontext(struct lwp *, struct trapframe *, 94 const sigset_t *, struct sigaltstack *, struct linux32_ucontext *); 95 static void linux32_save_sigcontext(struct lwp *, struct trapframe *, 96 const sigset_t *, struct linux32_sigcontext *); 97 static void linux32_rt_sendsig(const ksiginfo_t *, const sigset_t *); 98 static void linux32_old_sendsig(const ksiginfo_t *, const sigset_t *); 99 static int linux32_restore_sigcontext(struct lwp *, 100 struct linux32_sigcontext *, register_t *); 101 102 void 103 linux32_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 104 { 105 if (SIGACTION(curproc, ksi->ksi_signo).sa_flags & SA_SIGINFO) 106 linux32_rt_sendsig(ksi, mask); 107 else 108 linux32_old_sendsig(ksi, mask); 109 return; 110 } 111 112 void 113 linux32_old_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 114 { 115 struct lwp *l = curlwp; 116 struct proc *p = l->l_proc; 117 struct trapframe *tf; 118 struct linux32_sigframe *fp, frame; 119 int onstack, error; 120 int sig = ksi->ksi_signo; 121 sig_t catcher = SIGACTION(p, sig).sa_handler; 122 struct sigaltstack *sas = &l->l_sigstk; 123 124 tf = l->l_md.md_regs; 125 /* Do we need to jump onto the signal stack? */ 126 onstack = (sas->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 127 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 128 129 130 /* Allocate space for the signal handler context. */ 131 if (onstack) 132 fp = (struct linux32_sigframe *)((char *)sas->ss_sp + 133 sas->ss_size); 134 else 135 fp = (struct linux32_sigframe *)tf->tf_rsp; 136 fp--; 137 138 /* Build stack frame for signal trampoline. */ 139 NETBSD32PTR32(frame.sf_handler, catcher); 140 frame.sf_sig = native_to_linux32_signo[sig]; 141 142 linux32_save_sigcontext(l, tf, mask, &frame.sf_sc); 143 144 sendsig_reset(l, sig); 145 mutex_exit(p->p_lock); 146 error = copyout(&frame, fp, sizeof(frame)); 147 mutex_enter(p->p_lock); 148 149 if (error != 0) { 150 /* 151 * Process has trashed its stack; give it an illegal 152 * instruction to halt it in its tracks. 153 */ 154 sigexit(l, SIGILL); 155 /* NOTREACHED */ 156 } 157 158 /* 159 * Build context to run handler in. 160 */ 161 tf->tf_gs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 162 tf->tf_fs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 163 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 164 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 165 tf->tf_rip = ((long)p->p_sigctx.ps_sigcode) & 0xffffffff; 166 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL) & 0xffffffff; 167 tf->tf_rflags &= ~(PSL_T|PSL_VM|PSL_AC) & 0xffffffff; 168 tf->tf_rsp = (long)fp & 0xffffffff; 169 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 170 171 /* Remember that we're now on the signal stack. */ 172 if (onstack) 173 sas->ss_flags |= SS_ONSTACK; 174 175 return; 176 } 177 178 void 179 linux32_rt_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 180 { 181 struct lwp *l = curlwp; 182 struct proc *p = l->l_proc; 183 struct trapframe *tf; 184 struct linux32_rt_sigframe *fp, frame; 185 int onstack, error; 186 linux32_siginfo_t *lsi; 187 int sig = ksi->ksi_signo; 188 sig_t catcher = SIGACTION(p, sig).sa_handler; 189 struct sigaltstack *sas = &l->l_sigstk; 190 191 tf = l->l_md.md_regs; 192 /* Do we need to jump onto the signal stack? */ 193 onstack = (sas->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 194 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 195 196 197 /* Allocate space for the signal handler context. */ 198 if (onstack) 199 fp = (struct linux32_rt_sigframe *)((char *)sas->ss_sp + 200 sas->ss_size); 201 else 202 fp = (struct linux32_rt_sigframe *)tf->tf_rsp; 203 fp--; 204 205 /* Build stack frame for signal trampoline. */ 206 NETBSD32PTR32(frame.sf_handler, catcher); 207 frame.sf_sig = native_to_linux32_signo[sig]; 208 NETBSD32PTR32(frame.sf_sip, &fp->sf_si); 209 NETBSD32PTR32(frame.sf_ucp, &fp->sf_uc); 210 211 lsi = &frame.sf_si; 212 (void)memset(lsi, 0, sizeof(frame.sf_si)); 213 lsi->lsi_errno = native_to_linux32_errno[ksi->ksi_errno]; 214 lsi->lsi_code = ksi->ksi_code; 215 lsi->lsi_signo = native_to_linux32_signo[frame.sf_sig]; 216 switch (lsi->lsi_signo) { 217 case LINUX32_SIGILL: 218 case LINUX32_SIGFPE: 219 case LINUX32_SIGSEGV: 220 case LINUX32_SIGBUS: 221 case LINUX32_SIGTRAP: 222 NETBSD32PTR32(lsi->lsi_addr, ksi->ksi_addr); 223 break; 224 case LINUX32_SIGCHLD: 225 lsi->lsi_uid = ksi->ksi_uid; 226 lsi->lsi_pid = ksi->ksi_pid; 227 lsi->lsi_utime = ksi->ksi_utime; 228 lsi->lsi_stime = ksi->ksi_stime; 229 230 /* We use the same codes */ 231 lsi->lsi_code = ksi->ksi_code; 232 /* XXX is that right? */ 233 lsi->lsi_status = WEXITSTATUS(ksi->ksi_status); 234 break; 235 case LINUX32_SIGIO: 236 lsi->lsi_band = ksi->ksi_band; 237 lsi->lsi_fd = ksi->ksi_fd; 238 break; 239 default: 240 lsi->lsi_uid = ksi->ksi_uid; 241 lsi->lsi_pid = ksi->ksi_pid; 242 if (lsi->lsi_signo == LINUX32_SIGALRM || 243 lsi->lsi_signo >= LINUX32_SIGRTMIN) 244 NETBSD32PTR32(lsi->lsi_value.sival_ptr, 245 ksi->ksi_value.sival_ptr); 246 break; 247 } 248 249 /* Save register context. */ 250 linux32_save_ucontext(l, tf, mask, sas, &frame.sf_uc); 251 sendsig_reset(l, sig); 252 mutex_exit(p->p_lock); 253 error = copyout(&frame, fp, sizeof(frame)); 254 mutex_enter(p->p_lock); 255 256 if (error != 0) { 257 /* 258 * Process has trashed its stack; give it an illegal 259 * instruction to halt it in its tracks. 260 */ 261 sigexit(l, SIGILL); 262 /* NOTREACHED */ 263 } 264 265 /* 266 * Build context to run handler in. 267 */ 268 tf->tf_gs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 269 tf->tf_fs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 270 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 271 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 272 tf->tf_rip = (((long)p->p_sigctx.ps_sigcode) + 273 (linux32_rt_sigcode - linux32_sigcode)) & 0xffffffff; 274 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL) & 0xffffffff; 275 tf->tf_rflags &= ~(PSL_T|PSL_VM|PSL_AC) & 0xffffffff; 276 tf->tf_rsp = (long)fp & 0xffffffff; 277 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 278 279 /* Remember that we're now on the signal stack. */ 280 if (onstack) 281 sas->ss_flags |= SS_ONSTACK; 282 283 return; 284 } 285 286 void 287 linux32_setregs(struct lwp *l, struct exec_package *pack, u_long stack) 288 { 289 struct pcb *pcb = &l->l_addr->u_pcb; 290 struct trapframe *tf; 291 struct proc *p = l->l_proc; 292 void **retaddr; 293 294 /* If we were using the FPU, forget about it. */ 295 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 296 fpusave_lwp(l, 0); 297 298 #if defined(USER_LDT) && 0 299 pmap_ldt_cleanup(p); 300 #endif 301 302 netbsd32_adjust_limits(p); 303 304 l->l_md.md_flags &= ~MDP_USEDFPU; 305 pcb->pcb_flags = 0; 306 pcb->pcb_savefpu.fp_fxsave.fx_fcw = __Linux_NPXCW__; 307 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr = __INITIAL_MXCSR__; 308 pcb->pcb_savefpu.fp_fxsave.fx_mxcsr_mask = __INITIAL_MXCSR_MASK__; 309 pcb->pcb_fs = 0; 310 pcb->pcb_gs = 0; 311 312 313 p->p_flag |= PK_32; 314 315 tf = l->l_md.md_regs; 316 tf->tf_rax = 0; 317 tf->tf_rbx = (u_int64_t)p->p_psstr & 0xffffffff; 318 tf->tf_rcx = pack->ep_entry & 0xffffffff; 319 tf->tf_rdx = 0; 320 tf->tf_rsi = 0; 321 tf->tf_rdi = 0; 322 tf->tf_rbp = 0; 323 tf->tf_rsp = stack & 0xffffffff; 324 tf->tf_r8 = 0; 325 tf->tf_r9 = 0; 326 tf->tf_r10 = 0; 327 tf->tf_r11 = 0; 328 tf->tf_r12 = 0; 329 tf->tf_r13 = 0; 330 tf->tf_r14 = 0; 331 tf->tf_r15 = 0; 332 tf->tf_rip = pack->ep_entry & 0xffffffff; 333 tf->tf_rflags = PSL_USERSET; 334 tf->tf_cs = GSEL(GUCODE32_SEL, SEL_UPL) & 0xffffffff; 335 tf->tf_ss = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 336 tf->tf_ds = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 337 tf->tf_es = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 338 tf->tf_fs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 339 tf->tf_gs = GSEL(GUDATA32_SEL, SEL_UPL) & 0xffffffff; 340 341 /* XXX frob return address to return via old iret method, not sysret */ 342 retaddr = (void **)tf - 1; 343 *retaddr = (void *)osyscall_return; 344 return; 345 } 346 347 static void 348 linux32_save_ucontext(struct lwp *l, struct trapframe *tf, const sigset_t *mask, struct sigaltstack *sas, struct linux32_ucontext *uc) 349 { 350 uc->uc_flags = 0; 351 NETBSD32PTR32(uc->uc_link, NULL); 352 native_to_linux32_sigaltstack(&uc->uc_stack, sas); 353 linux32_save_sigcontext(l, tf, mask, &uc->uc_mcontext); 354 native_to_linux32_sigset(&uc->uc_sigmask, mask); 355 (void)memset(&uc->uc_fpregs_mem, 0, sizeof(uc->uc_fpregs_mem)); 356 } 357 358 static void 359 linux32_save_sigcontext(l, tf, mask, sc) 360 struct lwp *l; 361 struct trapframe *tf; 362 const sigset_t *mask; 363 struct linux32_sigcontext *sc; 364 { 365 /* Save register context. */ 366 sc->sc_gs = tf->tf_gs; 367 sc->sc_fs = tf->tf_fs; 368 sc->sc_es = tf->tf_es; 369 sc->sc_ds = tf->tf_ds; 370 sc->sc_eflags = tf->tf_rflags; 371 sc->sc_edi = tf->tf_rdi; 372 sc->sc_esi = tf->tf_rsi; 373 sc->sc_esp = tf->tf_rsp; 374 sc->sc_ebp = tf->tf_rbp; 375 sc->sc_ebx = tf->tf_rbx; 376 sc->sc_edx = tf->tf_rdx; 377 sc->sc_ecx = tf->tf_rcx; 378 sc->sc_eax = tf->tf_rax; 379 sc->sc_eip = tf->tf_rip; 380 sc->sc_cs = tf->tf_cs; 381 sc->sc_esp_at_signal = tf->tf_rsp; 382 sc->sc_ss = tf->tf_ss; 383 sc->sc_err = tf->tf_err; 384 sc->sc_trapno = tf->tf_trapno; 385 sc->sc_cr2 = l->l_addr->u_pcb.pcb_cr2; 386 NETBSD32PTR32(sc->sc_387, NULL); 387 388 /* Save signal stack. */ 389 /* Linux doesn't save the onstack flag in sigframe */ 390 391 /* Save signal mask. */ 392 native_to_linux32_old_sigset(&sc->sc_mask, mask); 393 } 394 395 int 396 linux32_sys_sigreturn(struct lwp *l, const struct linux32_sys_sigreturn_args *uap, register_t *retval) 397 { 398 /* { 399 syscallarg(linux32_sigcontextp_t) scp; 400 } */ 401 struct linux32_sigcontext ctx; 402 int error; 403 404 if ((error = copyin(SCARG_P32(uap, scp), &ctx, sizeof(ctx))) != 0) 405 return error; 406 407 return linux32_restore_sigcontext(l, &ctx, retval); 408 } 409 410 int 411 linux32_sys_rt_sigreturn(struct lwp *l, const struct linux32_sys_rt_sigreturn_args *uap, register_t *retval) 412 { 413 /* { 414 syscallarg(linux32_ucontextp_t) ucp; 415 } */ 416 struct linux32_ucontext ctx; 417 int error; 418 419 if ((error = copyin(SCARG_P32(uap, ucp), &ctx, sizeof(ctx))) != 0) 420 return error; 421 422 return linux32_restore_sigcontext(l, &ctx.uc_mcontext, retval); 423 } 424 425 static int 426 linux32_restore_sigcontext(l, scp, retval) 427 struct lwp *l; 428 struct linux32_sigcontext *scp; 429 register_t *retval; 430 { 431 struct trapframe *tf; 432 struct proc *p = l->l_proc; 433 struct sigaltstack *sas = &l->l_sigstk; 434 sigset_t mask; 435 ssize_t ss_gap; 436 437 /* Restore register context. */ 438 tf = l->l_md.md_regs; 439 440 /* 441 * Check for security violations. If we're returning to 442 * protected mode, the CPU will validate the segment registers 443 * automatically and generate a trap on violations. We handle 444 * the trap, rather than doing all of the checking here. 445 */ 446 if (((scp->sc_eflags ^ tf->tf_rflags) & PSL_USERSTATIC) != 0 || 447 !USERMODE(scp->sc_cs, scp->sc_eflags)) 448 return EINVAL; 449 450 if (scp->sc_fs != 0 && !VALID_USER_DSEL32(scp->sc_fs)) 451 return EINVAL; 452 453 if (scp->sc_gs != 0 && !VALID_USER_DSEL32(scp->sc_gs)) 454 return EINVAL; 455 456 if (scp->sc_es != 0 && !VALID_USER_DSEL32(scp->sc_es)) 457 return EINVAL; 458 459 if (!VALID_USER_DSEL32(scp->sc_ds) || 460 !VALID_USER_DSEL32(scp->sc_ss)) 461 return EINVAL; 462 463 if (scp->sc_eip >= VM_MAXUSER_ADDRESS32) 464 return EINVAL; 465 466 tf->tf_gs = (register_t)scp->sc_gs & 0xffffffff; 467 tf->tf_fs = (register_t)scp->sc_fs & 0xffffffff; 468 tf->tf_es = (register_t)scp->sc_es & 0xffffffff; 469 tf->tf_ds = (register_t)scp->sc_ds & 0xffffffff; 470 tf->tf_rflags &= ~PSL_USER; 471 tf->tf_rflags |= ((register_t)scp->sc_eflags & PSL_USER); 472 tf->tf_rdi = (register_t)scp->sc_edi & 0xffffffff; 473 tf->tf_rsi = (register_t)scp->sc_esi & 0xffffffff; 474 tf->tf_rbp = (register_t)scp->sc_ebp & 0xffffffff; 475 tf->tf_rbx = (register_t)scp->sc_ebx & 0xffffffff; 476 tf->tf_rdx = (register_t)scp->sc_edx & 0xffffffff; 477 tf->tf_rcx = (register_t)scp->sc_ecx & 0xffffffff; 478 tf->tf_rax = (register_t)scp->sc_eax & 0xffffffff; 479 tf->tf_rip = (register_t)scp->sc_eip & 0xffffffff; 480 tf->tf_cs = (register_t)scp->sc_cs & 0xffffffff; 481 tf->tf_rsp = (register_t)scp->sc_esp_at_signal & 0xffffffff; 482 tf->tf_ss = (register_t)scp->sc_ss & 0xffffffff; 483 484 mutex_enter(p->p_lock); 485 486 /* Restore signal stack. */ 487 ss_gap = (ssize_t) 488 ((char *)NETBSD32IPTR64(scp->sc_esp_at_signal) 489 - (char *)sas->ss_sp); 490 if (ss_gap >= 0 && ss_gap < sas->ss_size) 491 sas->ss_flags |= SS_ONSTACK; 492 else 493 sas->ss_flags &= ~SS_ONSTACK; 494 495 /* Restore signal mask. */ 496 linux32_old_to_native_sigset(&mask, &scp->sc_mask); 497 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 498 499 mutex_exit(p->p_lock); 500 501 #ifdef DEBUG_LINUX 502 printf("linux32_sigreturn: rip = 0x%lx, rsp = 0x%lx, flags = 0x%lx\n", 503 tf->tf_rip, tf->tf_rsp, tf->tf_rflags); 504 #endif 505 return EJUSTRETURN; 506 } 507
Indexes created Mon Oct 20 01:09:56 GMT 2025