1 /*- 2 * Copyright (c) 1992 Terrence R. Lambert. 3 * Copyright (C) 1994, David Greenman 4 * Copyright (c) 1982, 1987, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 39 * $FreeBSD: src/sys/i386/i386/machdep.c,v 1.385.2.30 2003/05/31 08:48:05 alc Exp $ 40 */ 41 42 #include "opt_ddb.h" 43 #include "opt_inet.h" 44 #include "opt_msgbuf.h" 45 #include "opt_swap.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/sysproto.h> 50 #include <sys/signalvar.h> 51 #include <sys/kernel.h> 52 #include <sys/linker.h> 53 #include <sys/malloc.h> 54 #include <sys/proc.h> 55 #include <sys/buf.h> 56 #include <sys/reboot.h> 57 #include <sys/mbuf.h> 58 #include <sys/msgbuf.h> 59 #include <sys/sysent.h> 60 #include <sys/sysctl.h> 61 #include <sys/vmmeter.h> 62 #include <sys/bus.h> 63 #include <sys/usched.h> 64 #include <sys/reg.h> 65 66 #include <vm/vm.h> 67 #include <vm/vm_param.h> 68 #include <sys/lock.h> 69 #include <vm/vm_kern.h> 70 #include <vm/vm_object.h> 71 #include <vm/vm_page.h> 72 #include <vm/vm_map.h> 73 #include <vm/vm_pager.h> 74 #include <vm/vm_extern.h> 75 76 #include <sys/thread2.h> 77 #include <sys/mplock2.h> 78 79 #include <sys/exec.h> 80 #include <sys/cons.h> 81 82 #include <ddb/ddb.h> 83 84 #include <machine/cpu.h> 85 #include <machine/clock.h> 86 #include <machine/specialreg.h> 87 #include <machine/md_var.h> 88 #include <machine/pcb.h> 89 #include <machine/pcb_ext.h> 90 #include <machine/globaldata.h> /* CPU_prvspace */ 91 #include <machine/smp.h> 92 #include <machine/cputypes.h> 93 94 #include <bus/isa/rtc.h> 95 #include <sys/random.h> 96 #include <sys/ptrace.h> 97 #include <machine/sigframe.h> 98 #include <unistd.h> /* umtx_* functions */ 99 #include <pthread.h> /* pthread_yield() */ 100 101 extern void dblfault_handler (void); 102 103 static void set_fpregs_xmm (struct save87 *, struct savexmm *); 104 static void fill_fpregs_xmm (struct savexmm *, struct save87 *); 105 106 int64_t tsc_offsets[MAXCPU]; 107 108 #if defined(SWTCH_OPTIM_STATS) 109 extern int swtch_optim_stats; 110 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats, 111 CTLFLAG_RD, &swtch_optim_stats, 0, ""); 112 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count, 113 CTLFLAG_RD, &tlb_flush_count, 0, ""); 114 #endif 115 116 static int 117 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS) 118 { 119 u_long pmem = ctob(physmem); 120 int error; 121 122 error = sysctl_handle_long(oidp, &pmem, 0, req); 123 124 return (error); 125 } 126 127 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD, 128 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)"); 129 130 static int 131 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS) 132 { 133 u_long usermem = ctob(Maxmem - vmstats.v_wire_count); 134 int error; 135 136 error = sysctl_handle_long(oidp, &usermem, 0, req); 137 138 return (error); 139 } 140 141 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_ULONG|CTLFLAG_RD, 142 0, 0, sysctl_hw_usermem, "LU", ""); 143 144 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &Maxmem, 0, ""); 145 146 /* 147 * Send an interrupt to process. 148 * 149 * Stack is set up to allow sigcode stored 150 * at top to call routine, followed by kcall 151 * to sigreturn routine below. After sigreturn 152 * resets the signal mask, the stack, and the 153 * frame pointer, it returns to the user 154 * specified pc, psl. 155 */ 156 void 157 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code) 158 { 159 struct lwp *lp = curthread->td_lwp; 160 struct proc *p = lp->lwp_proc; 161 struct trapframe *regs; 162 struct sigacts *psp = p->p_sigacts; 163 struct sigframe sf, *sfp; 164 int oonstack; 165 char *sp; 166 167 regs = lp->lwp_md.md_regs; 168 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0; 169 170 /* Save user context */ 171 bzero(&sf, sizeof(struct sigframe)); 172 sf.sf_uc.uc_sigmask = *mask; 173 sf.sf_uc.uc_stack = lp->lwp_sigstk; 174 sf.sf_uc.uc_mcontext.mc_onstack = oonstack; 175 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0); 176 /* gcc8 craps out on -Warray-bounds w/ optimized bcopy */ 177 _bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe)); 178 179 /* Make the size of the saved context visible to userland */ 180 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); 181 182 /* Allocate and validate space for the signal handler context. */ 183 if ((lp->lwp_flags & LWP_ALTSTACK) != 0 && !oonstack && 184 SIGISMEMBER(psp->ps_sigonstack, sig)) { 185 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size - 186 sizeof(struct sigframe)); 187 lp->lwp_sigstk.ss_flags |= SS_ONSTACK; 188 } else { 189 /* We take red zone into account */ 190 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128; 191 } 192 193 /* Align to 16 bytes */ 194 sfp = (struct sigframe *)((intptr_t)sp & ~0xFUL); 195 196 /* Translate the signal is appropriate */ 197 if (p->p_sysent->sv_sigtbl) { 198 if (sig <= p->p_sysent->sv_sigsize) 199 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 200 } 201 202 /* 203 * Build the argument list for the signal handler. 204 * 205 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx) 206 */ 207 regs->tf_rdi = sig; /* argument 1 */ 208 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */ 209 210 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 211 /* 212 * Signal handler installed with SA_SIGINFO. 213 * 214 * action(signo, siginfo, ucontext) 215 */ 216 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */ 217 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */ 218 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher; 219 220 /* fill siginfo structure */ 221 sf.sf_si.si_signo = sig; 222 sf.sf_si.si_pid = psp->ps_frominfo[sig].pid; 223 sf.sf_si.si_uid = psp->ps_frominfo[sig].uid; 224 sf.sf_si.si_code = code; 225 sf.sf_si.si_addr = (void *)regs->tf_addr; 226 } else { 227 /* 228 * Old FreeBSD-style arguments. 229 * 230 * handler (signo, code, [uc], addr) 231 */ 232 regs->tf_rsi = (register_t)code; /* argument 2 */ 233 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */ 234 sf.sf_ahu.sf_handler = catcher; 235 } 236 237 #if 0 238 /* 239 * If we're a vm86 process, we want to save the segment registers. 240 * We also change eflags to be our emulated eflags, not the actual 241 * eflags. 242 */ 243 if (regs->tf_eflags & PSL_VM) { 244 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 245 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86; 246 247 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs; 248 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs; 249 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es; 250 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds; 251 252 if (vm86->vm86_has_vme == 0) 253 sf.sf_uc.uc_mcontext.mc_eflags = 254 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) | 255 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP)); 256 257 /* 258 * Clear PSL_NT to inhibit T_TSSFLT faults on return from 259 * syscalls made by the signal handler. This just avoids 260 * wasting time for our lazy fixup of such faults. PSL_NT 261 * does nothing in vm86 mode, but vm86 programs can set it 262 * almost legitimately in probes for old cpu types. 263 */ 264 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP); 265 } 266 #endif 267 268 /* 269 * Save the FPU state and reinit the FP unit 270 */ 271 npxpush(&sf.sf_uc.uc_mcontext); 272 273 /* 274 * Copy the sigframe out to the user's stack. 275 */ 276 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) { 277 /* 278 * Something is wrong with the stack pointer. 279 * ...Kill the process. 280 */ 281 sigexit(lp, SIGILL); 282 } 283 284 regs->tf_rsp = (register_t)sfp; 285 regs->tf_rip = trunc_page64(PS_STRINGS - *(p->p_sysent->sv_szsigcode)); 286 regs->tf_rip -= SZSIGCODE_EXTRA_BYTES; 287 288 /* 289 * x86 abi specifies that the direction flag must be cleared 290 * on function entry 291 */ 292 regs->tf_rflags &= ~(PSL_T|PSL_D); 293 294 /* 295 * 64 bit mode has a code and stack selector but 296 * no data or extra selector. %fs and %gs are not 297 * stored in-context. 298 */ 299 regs->tf_cs = _ucodesel; 300 regs->tf_ss = _udatasel; 301 } 302 303 /* 304 * Sanitize the trapframe for a virtual kernel passing control to a custom 305 * VM context. Remove any items that would otherwise create a privilage 306 * issue. 307 * 308 * XXX at the moment we allow userland to set the resume flag. Is this a 309 * bad idea? 310 */ 311 int 312 cpu_sanitize_frame(struct trapframe *frame) 313 { 314 frame->tf_cs = _ucodesel; 315 frame->tf_ss = _udatasel; 316 /* XXX VM (8086) mode not supported? */ 317 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP); 318 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I; 319 320 return(0); 321 } 322 323 /* 324 * Sanitize the tls so loading the descriptor does not blow up 325 * on us. For x86_64 we don't have to do anything. 326 */ 327 int 328 cpu_sanitize_tls(struct savetls *tls) 329 { 330 return(0); 331 } 332 333 /* 334 * sigreturn(ucontext_t *sigcntxp) 335 * 336 * System call to cleanup state after a signal 337 * has been taken. Reset signal mask and 338 * stack state from context left by sendsig (above). 339 * Return to previous pc and psl as specified by 340 * context left by sendsig. Check carefully to 341 * make sure that the user has not modified the 342 * state to gain improper privileges. 343 */ 344 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 345 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 346 347 int 348 sys_sigreturn(struct sigreturn_args *uap) 349 { 350 struct lwp *lp = curthread->td_lwp; 351 struct trapframe *regs; 352 ucontext_t uc; 353 ucontext_t *ucp; 354 register_t rflags; 355 int cs; 356 int error; 357 358 /* 359 * We have to copy the information into kernel space so userland 360 * can't modify it while we are sniffing it. 361 */ 362 regs = lp->lwp_md.md_regs; 363 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 364 if (error) 365 return (error); 366 ucp = &uc; 367 rflags = ucp->uc_mcontext.mc_rflags; 368 369 /* VM (8086) mode not supported */ 370 rflags &= ~PSL_VM_UNSUPP; 371 372 #if 0 373 if (eflags & PSL_VM) { 374 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs; 375 struct vm86_kernel *vm86; 376 377 /* 378 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't 379 * set up the vm86 area, and we can't enter vm86 mode. 380 */ 381 if (lp->lwp_thread->td_pcb->pcb_ext == 0) 382 return (EINVAL); 383 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86; 384 if (vm86->vm86_inited == 0) 385 return (EINVAL); 386 387 /* go back to user mode if both flags are set */ 388 if ((eflags & PSL_VIP) && (eflags & PSL_VIF)) 389 trapsignal(lp->lwp_proc, SIGBUS, 0); 390 391 if (vm86->vm86_has_vme) { 392 eflags = (tf->tf_eflags & ~VME_USERCHANGE) | 393 (eflags & VME_USERCHANGE) | PSL_VM; 394 } else { 395 vm86->vm86_eflags = eflags; /* save VIF, VIP */ 396 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM; 397 } 398 bcopy(&ucp.uc_mcontext.mc_gs, tf, sizeof(struct trapframe)); 399 tf->tf_eflags = eflags; 400 tf->tf_vm86_ds = tf->tf_ds; 401 tf->tf_vm86_es = tf->tf_es; 402 tf->tf_vm86_fs = tf->tf_fs; 403 tf->tf_vm86_gs = tf->tf_gs; 404 tf->tf_ds = _udatasel; 405 tf->tf_es = _udatasel; 406 #if 0 407 tf->tf_fs = _udatasel; 408 tf->tf_gs = _udatasel; 409 #endif 410 } else 411 #endif 412 { 413 /* 414 * Don't allow users to change privileged or reserved flags. 415 */ 416 /* 417 * XXX do allow users to change the privileged flag PSL_RF. 418 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 419 * should sometimes set it there too. tf_eflags is kept in 420 * the signal context during signal handling and there is no 421 * other place to remember it, so the PSL_RF bit may be 422 * corrupted by the signal handler without us knowing. 423 * Corruption of the PSL_RF bit at worst causes one more or 424 * one less debugger trap, so allowing it is fairly harmless. 425 */ 426 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 427 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags); 428 return(EINVAL); 429 } 430 431 /* 432 * Don't allow users to load a valid privileged %cs. Let the 433 * hardware check for invalid selectors, excess privilege in 434 * other selectors, invalid %eip's and invalid %esp's. 435 */ 436 cs = ucp->uc_mcontext.mc_cs; 437 if (!CS_SECURE(cs)) { 438 kprintf("sigreturn: cs = 0x%x\n", cs); 439 trapsignal(lp, SIGBUS, T_PROTFLT); 440 return(EINVAL); 441 } 442 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe)); 443 } 444 445 /* 446 * Restore the FPU state from the frame 447 */ 448 npxpop(&ucp->uc_mcontext); 449 450 if (ucp->uc_mcontext.mc_onstack & 1) 451 lp->lwp_sigstk.ss_flags |= SS_ONSTACK; 452 else 453 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK; 454 455 lp->lwp_sigmask = ucp->uc_sigmask; 456 SIG_CANTMASK(lp->lwp_sigmask); 457 return(EJUSTRETURN); 458 } 459 460 /* 461 * cpu_idle() represents the idle LWKT. You cannot return from this function 462 * (unless you want to blow things up!). Instead we look for runnable threads 463 * and loop or halt as appropriate. Giant is not held on entry to the thread. 464 * 465 * The main loop is entered with a critical section held, we must release 466 * the critical section before doing anything else. lwkt_switch() will 467 * check for pending interrupts due to entering and exiting its own 468 * critical section. 469 * 470 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI 471 * to wake a HLTed cpu up. 472 */ 473 __read_mostly static int cpu_idle_hlt = 1; 474 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW, 475 &cpu_idle_hlt, 0, "Idle loop HLT enable"); 476 477 void 478 cpu_idle(void) 479 { 480 struct thread *td = curthread; 481 struct mdglobaldata *gd = mdcpu; 482 int reqflags; 483 484 crit_exit(); 485 KKASSERT(td->td_critcount == 0); 486 cpu_enable_intr(); 487 488 for (;;) { 489 /* 490 * See if there are any LWKTs ready to go. 491 */ 492 lwkt_switch(); 493 494 /* 495 * The idle loop halts only if no threads are scheduleable 496 * and no signals have occured. 497 */ 498 if (cpu_idle_hlt && 499 (td->td_gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) { 500 splz(); 501 if ((td->td_gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) { 502 #ifdef DEBUGIDLE 503 struct timeval tv1, tv2; 504 gettimeofday(&tv1, NULL); 505 #endif 506 reqflags = gd->mi.gd_reqflags & 507 ~RQF_IDLECHECK_WK_MASK; 508 KKASSERT(gd->mi.gd_processing_ipiq == 0); 509 umtx_sleep(&gd->mi.gd_reqflags, reqflags, 510 1000000); 511 #ifdef DEBUGIDLE 512 gettimeofday(&tv2, NULL); 513 if (tv2.tv_usec - tv1.tv_usec + 514 (tv2.tv_sec - tv1.tv_sec) * 1000000 515 > 500000) { 516 kprintf("cpu %d idlelock %08x %08x\n", 517 gd->mi.gd_cpuid, 518 gd->mi.gd_reqflags, 519 gd->gd_fpending); 520 } 521 #endif 522 } 523 } else { 524 splz(); 525 __asm __volatile("pause"); 526 } 527 } 528 } 529 530 /* 531 * Called by the spinlock code with or without a critical section held 532 * when a spinlock is found to be seriously constested. 533 * 534 * We need to enter a critical section to prevent signals from recursing 535 * into pthreads. 536 */ 537 void 538 cpu_spinlock_contested(void) 539 { 540 cpu_pause(); 541 } 542 543 /* 544 * Clear registers on exec 545 */ 546 void 547 exec_setregs(u_long entry, u_long stack, u_long ps_strings) 548 { 549 struct thread *td = curthread; 550 struct lwp *lp = td->td_lwp; 551 struct pcb *pcb = td->td_pcb; 552 struct trapframe *regs = lp->lwp_md.md_regs; 553 554 user_ldt_free(pcb); 555 556 bzero((char *)regs, sizeof(struct trapframe)); 557 regs->tf_rip = entry; 558 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */ 559 regs->tf_rdi = stack; /* argv */ 560 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 561 regs->tf_ss = _udatasel; 562 regs->tf_cs = _ucodesel; 563 regs->tf_rbx = ps_strings; 564 565 /* 566 * Reset the hardware debug registers if they were in use. 567 * They won't have any meaning for the newly exec'd process. 568 */ 569 if (pcb->pcb_flags & PCB_DBREGS) { 570 pcb->pcb_dr0 = 0; 571 pcb->pcb_dr1 = 0; 572 pcb->pcb_dr2 = 0; 573 pcb->pcb_dr3 = 0; 574 pcb->pcb_dr6 = 0; 575 pcb->pcb_dr7 = 0; /* JG set bit 10? */ 576 if (pcb == td->td_pcb) { 577 /* 578 * Clear the debug registers on the running 579 * CPU, otherwise they will end up affecting 580 * the next process we switch to. 581 */ 582 reset_dbregs(); 583 } 584 pcb->pcb_flags &= ~PCB_DBREGS; 585 } 586 587 /* 588 * Initialize the math emulator (if any) for the current process. 589 * Actually, just clear the bit that says that the emulator has 590 * been initialized. Initialization is delayed until the process 591 * traps to the emulator (if it is done at all) mainly because 592 * emulators don't provide an entry point for initialization. 593 */ 594 pcb->pcb_flags &= ~FP_SOFTFP; 595 596 /* 597 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing 598 * gd_npxthread. Otherwise a preemptive interrupt thread 599 * may panic in npxdna(). 600 */ 601 crit_enter(); 602 #if 0 603 load_cr0(rcr0() | CR0_MP); 604 #endif 605 606 /* 607 * NOTE: The MSR values must be correct so we can return to 608 * userland. gd_user_fs/gs must be correct so the switch 609 * code knows what the current MSR values are. 610 */ 611 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */ 612 pcb->pcb_gsbase = 0; 613 /* Initialize the npx (if any) for the current process. */ 614 npxinit(); 615 crit_exit(); 616 617 /* 618 * note: linux emulator needs edx to be 0x0 on entry, which is 619 * handled in execve simply by setting the 64 bit syscall 620 * return value to 0. 621 */ 622 } 623 624 void 625 cpu_setregs(void) 626 { 627 #if 0 628 unsigned int cr0; 629 630 cr0 = rcr0(); 631 cr0 |= CR0_NE; /* Done by npxinit() */ 632 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */ 633 cr0 |= CR0_WP | CR0_AM; 634 load_cr0(cr0); 635 load_gs(_udatasel); 636 #endif 637 } 638 639 static int 640 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS) 641 { 642 int error; 643 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, 644 req); 645 if (!error && req->newptr) 646 resettodr(); 647 return (error); 648 } 649 650 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW, 651 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", ""); 652 653 /* 654 * Initialize x86 and configure to run kernel 655 */ 656 657 /* 658 * Initialize segments & interrupt table 659 */ 660 661 extern struct user *proc0paddr; 662 663 #if 0 664 665 extern inthand_t 666 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl), 667 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm), 668 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot), 669 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align), 670 IDTVEC(xmm), IDTVEC(dblfault), 671 IDTVEC(fast_syscall), IDTVEC(fast_syscall32); 672 #endif 673 674 int 675 ptrace_set_pc(struct lwp *lp, unsigned long addr) 676 { 677 lp->lwp_md.md_regs->tf_rip = addr; 678 return (0); 679 } 680 681 int 682 ptrace_single_step(struct lwp *lp) 683 { 684 lp->lwp_md.md_regs->tf_rflags |= PSL_T; 685 return (0); 686 } 687 688 int 689 fill_regs(struct lwp *lp, struct reg *regs) 690 { 691 struct trapframe *tp; 692 693 if ((tp = lp->lwp_md.md_regs) == NULL) 694 return EINVAL; 695 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs)); 696 return (0); 697 } 698 699 int 700 set_regs(struct lwp *lp, struct reg *regs) 701 { 702 struct trapframe *tp; 703 704 tp = lp->lwp_md.md_regs; 705 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) || 706 !CS_SECURE(regs->r_cs)) 707 return (EINVAL); 708 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs)); 709 return (0); 710 } 711 712 static void 713 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87) 714 { 715 struct env87 *penv_87 = &sv_87->sv_env; 716 struct envxmm *penv_xmm = &sv_xmm->sv_env; 717 int i; 718 719 /* FPU control/status */ 720 penv_87->en_cw = penv_xmm->en_cw; 721 penv_87->en_sw = penv_xmm->en_sw; 722 penv_87->en_tw = penv_xmm->en_tw; 723 penv_87->en_fip = penv_xmm->en_fip; 724 penv_87->en_fcs = penv_xmm->en_fcs; 725 penv_87->en_opcode = penv_xmm->en_opcode; 726 penv_87->en_foo = penv_xmm->en_foo; 727 penv_87->en_fos = penv_xmm->en_fos; 728 729 /* FPU registers */ 730 for (i = 0; i < 8; ++i) 731 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc; 732 } 733 734 static void 735 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm) 736 { 737 struct env87 *penv_87 = &sv_87->sv_env; 738 struct envxmm *penv_xmm = &sv_xmm->sv_env; 739 int i; 740 741 /* FPU control/status */ 742 penv_xmm->en_cw = penv_87->en_cw; 743 penv_xmm->en_sw = penv_87->en_sw; 744 penv_xmm->en_tw = penv_87->en_tw; 745 penv_xmm->en_fip = penv_87->en_fip; 746 penv_xmm->en_fcs = penv_87->en_fcs; 747 penv_xmm->en_opcode = penv_87->en_opcode; 748 penv_xmm->en_foo = penv_87->en_foo; 749 penv_xmm->en_fos = penv_87->en_fos; 750 751 /* FPU registers */ 752 for (i = 0; i < 8; ++i) 753 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i]; 754 } 755 756 int 757 fill_fpregs(struct lwp *lp, struct fpreg *fpregs) 758 { 759 if (lp->lwp_thread == NULL || lp->lwp_thread->td_pcb == NULL) 760 return EINVAL; 761 if (cpu_fxsr) { 762 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm, 763 (struct save87 *)fpregs); 764 return (0); 765 } 766 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs); 767 return (0); 768 } 769 770 int 771 set_fpregs(struct lwp *lp, struct fpreg *fpregs) 772 { 773 if (cpu_fxsr) { 774 set_fpregs_xmm((struct save87 *)fpregs, 775 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm); 776 return (0); 777 } 778 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs); 779 return (0); 780 } 781 782 int 783 fill_dbregs(struct lwp *lp, struct dbreg *dbregs) 784 { 785 return (ENOSYS); 786 } 787 788 int 789 set_dbregs(struct lwp *lp, struct dbreg *dbregs) 790 { 791 return (ENOSYS); 792 } 793 794 #if 0 795 /* 796 * Return > 0 if a hardware breakpoint has been hit, and the 797 * breakpoint was in user space. Return 0, otherwise. 798 */ 799 int 800 user_dbreg_trap(void) 801 { 802 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */ 803 u_int32_t bp; /* breakpoint bits extracted from dr6 */ 804 int nbp; /* number of breakpoints that triggered */ 805 caddr_t addr[4]; /* breakpoint addresses */ 806 int i; 807 808 dr7 = rdr7(); 809 if ((dr7 & 0x000000ff) == 0) { 810 /* 811 * all GE and LE bits in the dr7 register are zero, 812 * thus the trap couldn't have been caused by the 813 * hardware debug registers 814 */ 815 return 0; 816 } 817 818 nbp = 0; 819 dr6 = rdr6(); 820 bp = dr6 & 0x0000000f; 821 822 if (!bp) { 823 /* 824 * None of the breakpoint bits are set meaning this 825 * trap was not caused by any of the debug registers 826 */ 827 return 0; 828 } 829 830 /* 831 * at least one of the breakpoints were hit, check to see 832 * which ones and if any of them are user space addresses 833 */ 834 835 if (bp & 0x01) { 836 addr[nbp++] = (caddr_t)rdr0(); 837 } 838 if (bp & 0x02) { 839 addr[nbp++] = (caddr_t)rdr1(); 840 } 841 if (bp & 0x04) { 842 addr[nbp++] = (caddr_t)rdr2(); 843 } 844 if (bp & 0x08) { 845 addr[nbp++] = (caddr_t)rdr3(); 846 } 847 848 for (i=0; i<nbp; i++) { 849 if (addr[i] < 850 (caddr_t)VM_MAX_USER_ADDRESS) { 851 /* 852 * addr[i] is in user space 853 */ 854 return nbp; 855 } 856 } 857 858 /* 859 * None of the breakpoints are in user space. 860 */ 861 return 0; 862 } 863 864 #endif 865 866 void 867 identcpu(void) 868 { 869 int regs[4]; 870 871 do_cpuid(1, regs); 872 cpu_feature = regs[3]; 873 } 874 875 876 #ifndef DDB 877 void 878 Debugger(const char *msg) 879 { 880 kprintf("Debugger(\"%s\") called.\n", msg); 881 } 882 #endif /* no DDB */ 883