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