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.
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
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 $
43 #include "opt_compat.h"
45 #include "opt_directio.h"
47 #include "opt_msgbuf.h"
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/sysproto.h>
53 #include <sys/signalvar.h>
54 #include <sys/kernel.h>
55 #include <sys/linker.h>
56 #include <sys/malloc.h>
59 #include <sys/reboot.h>
61 #include <sys/msgbuf.h>
62 #include <sys/sysent.h>
63 #include <sys/sysctl.h>
64 #include <sys/vmmeter.h>
66 #include <sys/usched.h>
70 #include <vm/vm_param.h>
72 #include <vm/vm_kern.h>
73 #include <vm/vm_object.h>
74 #include <vm/vm_page.h>
75 #include <vm/vm_map.h>
76 #include <vm/vm_pager.h>
77 #include <vm/vm_extern.h>
79 #include <sys/thread2.h>
80 #include <sys/mplock2.h>
88 #include <machine/cpu.h>
89 #include <machine/clock.h>
90 #include <machine/specialreg.h>
91 #include <machine/md_var.h>
92 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
93 #include <machine/globaldata.h> /* CPU_prvspace */
94 #include <machine/smp.h>
96 #include <machine/perfmon.h>
98 #include <machine/cputypes.h>
100 #include <bus/isa/rtc.h>
101 #include <machine/vm86.h>
102 #include <sys/random.h>
103 #include <sys/ptrace.h>
104 #include <machine/sigframe.h>
105 #include <unistd.h> /* umtx_* functions */
106 #include <pthread.h> /* pthread_yield */
108 extern void dblfault_handler (void);
110 #ifndef CPU_DISABLE_SSE
111 static void set_fpregs_xmm (struct save87 *, struct savexmm *);
112 static void fill_fpregs_xmm (struct savexmm *, struct save87 *);
113 #endif /* CPU_DISABLE_SSE */
115 extern void ffs_rawread_setup(void);
116 #endif /* DIRECTIO */
118 int64_t tsc_offsets[MAXCPU];
120 #if defined(SWTCH_OPTIM_STATS)
121 extern int swtch_optim_stats;
122 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
123 CTLFLAG_RD, &swtch_optim_stats, 0, "");
124 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
125 CTLFLAG_RD, &tlb_flush_count, 0, "");
129 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
131 u_long pmem = ctob(physmem);
133 int error = sysctl_handle_long(oidp, &pmem, 0, req);
137 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD,
138 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)");
141 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
143 int error = sysctl_handle_int(oidp, 0,
144 ctob((int)Maxmem - vmstats.v_wire_count), req);
148 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
149 0, 0, sysctl_hw_usermem, "IU", "");
151 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &Maxmem, 0, "");
156 sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
160 /* Unwind the buffer, so that it's linear (possibly starting with
161 * some initial nulls).
163 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
164 msgbufp->msg_size-msgbufp->msg_bufr,req);
165 if(error) return(error);
166 if(msgbufp->msg_bufr>0) {
167 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
168 msgbufp->msg_bufr,req);
173 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
174 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
176 static int msgbuf_clear;
179 sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
182 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
184 if (!error && req->newptr) {
185 /* Clear the buffer and reset write pointer */
186 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
187 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
193 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
194 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
195 "Clear kernel message buffer");
200 * Send an interrupt to process.
202 * Stack is set up to allow sigcode stored
203 * at top to call routine, followed by kcall
204 * to sigreturn routine below. After sigreturn
205 * resets the signal mask, the stack, and the
206 * frame pointer, it returns to the user
210 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
212 struct lwp *lp = curthread->td_lwp;
213 struct proc *p = lp->lwp_proc;
214 struct trapframe *regs;
215 struct sigacts *psp = p->p_sigacts;
216 struct sigframe sf, *sfp;
219 regs = lp->lwp_md.md_regs;
220 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
222 /* save user context */
223 bzero(&sf, sizeof(struct sigframe));
224 sf.sf_uc.uc_sigmask = *mask;
225 sf.sf_uc.uc_stack = lp->lwp_sigstk;
226 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
227 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_gs, sizeof(struct trapframe));
229 /* make the size of the saved context visible to userland */
230 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
232 /* Allocate and validate space for the signal handler context. */
233 if ((lp->lwp_flags & LWP_ALTSTACK) != 0 && !oonstack &&
234 SIGISMEMBER(psp->ps_sigonstack, sig)) {
235 sfp = (struct sigframe *)(lp->lwp_sigstk.ss_sp +
236 lp->lwp_sigstk.ss_size - sizeof(struct sigframe));
237 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
240 sfp = (struct sigframe *)regs->tf_esp - 1;
242 /* Translate the signal is appropriate */
243 if (p->p_sysent->sv_sigtbl) {
244 if (sig <= p->p_sysent->sv_sigsize)
245 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
248 /* Build the argument list for the signal handler. */
250 sf.sf_ucontext = (register_t)&sfp->sf_uc;
251 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
252 /* Signal handler installed with SA_SIGINFO. */
253 sf.sf_siginfo = (register_t)&sfp->sf_si;
254 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
256 /* fill siginfo structure */
257 sf.sf_si.si_signo = sig;
258 sf.sf_si.si_code = code;
259 sf.sf_si.si_addr = (void*)regs->tf_err;
262 /* Old FreeBSD-style arguments. */
263 sf.sf_siginfo = code;
264 sf.sf_addr = regs->tf_err;
265 sf.sf_ahu.sf_handler = catcher;
270 * If we're a vm86 process, we want to save the segment registers.
271 * We also change eflags to be our emulated eflags, not the actual
274 if (regs->tf_eflags & PSL_VM) {
275 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
276 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
278 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
279 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
280 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
281 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
283 if (vm86->vm86_has_vme == 0)
284 sf.sf_uc.uc_mcontext.mc_eflags =
285 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
286 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
289 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
290 * syscalls made by the signal handler. This just avoids
291 * wasting time for our lazy fixup of such faults. PSL_NT
292 * does nothing in vm86 mode, but vm86 programs can set it
293 * almost legitimately in probes for old cpu types.
295 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
300 * Save the FPU state and reinit the FP unit
302 npxpush(&sf.sf_uc.uc_mcontext);
305 * Copy the sigframe out to the user's stack.
307 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
309 * Something is wrong with the stack pointer.
310 * ...Kill the process.
315 regs->tf_esp = (int)sfp;
316 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
319 * i386 abi specifies that the direction flag must be cleared
322 regs->tf_eflags &= ~(PSL_T|PSL_D);
324 regs->tf_cs = _ucodesel;
325 regs->tf_ds = _udatasel;
326 regs->tf_es = _udatasel;
327 if (regs->tf_trapno == T_PROTFLT) {
328 regs->tf_fs = _udatasel;
329 regs->tf_gs = _udatasel;
331 regs->tf_ss = _udatasel;
335 * Sanitize the trapframe for a virtual kernel passing control to a custom
338 * Allow userland to set or maintain PSL_RF, the resume flag. This flag
339 * basically controls whether the return PC should skip the first instruction
340 * (as in an explicit system call) or re-execute it (as in an exception).
343 cpu_sanitize_frame(struct trapframe *frame)
345 frame->tf_cs = _ucodesel;
346 frame->tf_ds = _udatasel;
347 frame->tf_es = _udatasel;
349 frame->tf_fs = _udatasel;
350 frame->tf_gs = _udatasel;
352 frame->tf_ss = _udatasel;
353 frame->tf_eflags &= (PSL_RF | PSL_USERCHANGE);
354 frame->tf_eflags |= PSL_RESERVED_DEFAULT | PSL_I;
359 cpu_sanitize_tls(struct savetls *tls)
361 struct segment_descriptor *desc;
364 for (i = 0; i < NGTLS; ++i) {
366 if (desc->sd_dpl == 0 && desc->sd_type == 0)
368 if (desc->sd_def32 == 0)
370 if (desc->sd_type != SDT_MEMRWA)
372 if (desc->sd_dpl != SEL_UPL)
374 if (desc->sd_xx != 0 || desc->sd_p != 1)
381 * sigreturn(ucontext_t *sigcntxp)
383 * System call to cleanup state after a signal
384 * has been taken. Reset signal mask and
385 * stack state from context left by sendsig (above).
386 * Return to previous pc and psl as specified by
387 * context left by sendsig. Check carefully to
388 * make sure that the user has not modified the
389 * state to gain improper privileges.
393 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
394 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
397 sys_sigreturn(struct sigreturn_args *uap)
399 struct lwp *lp = curthread->td_lwp;
400 struct trapframe *regs;
406 error = copyin(uap->sigcntxp, &ucp, sizeof(ucp));
410 regs = lp->lwp_md.md_regs;
411 eflags = ucp.uc_mcontext.mc_eflags;
414 if (eflags & PSL_VM) {
415 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
416 struct vm86_kernel *vm86;
419 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
420 * set up the vm86 area, and we can't enter vm86 mode.
422 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
424 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
425 if (vm86->vm86_inited == 0)
428 /* go back to user mode if both flags are set */
429 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
430 trapsignal(lp->lwp_proc, SIGBUS, 0);
432 if (vm86->vm86_has_vme) {
433 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
434 (eflags & VME_USERCHANGE) | PSL_VM;
436 vm86->vm86_eflags = eflags; /* save VIF, VIP */
437 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
439 bcopy(&ucp.uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
440 tf->tf_eflags = eflags;
441 tf->tf_vm86_ds = tf->tf_ds;
442 tf->tf_vm86_es = tf->tf_es;
443 tf->tf_vm86_fs = tf->tf_fs;
444 tf->tf_vm86_gs = tf->tf_gs;
445 tf->tf_ds = _udatasel;
446 tf->tf_es = _udatasel;
448 tf->tf_fs = _udatasel;
449 tf->tf_gs = _udatasel;
455 * Don't allow users to change privileged or reserved flags.
458 * XXX do allow users to change the privileged flag PSL_RF.
459 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
460 * should sometimes set it there too. tf_eflags is kept in
461 * the signal context during signal handling and there is no
462 * other place to remember it, so the PSL_RF bit may be
463 * corrupted by the signal handler without us knowing.
464 * Corruption of the PSL_RF bit at worst causes one more or
465 * one less debugger trap, so allowing it is fairly harmless.
467 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) {
468 kprintf("sigreturn: eflags = 0x%x\n", eflags);
473 * Don't allow users to load a valid privileged %cs. Let the
474 * hardware check for invalid selectors, excess privilege in
475 * other selectors, invalid %eip's and invalid %esp's.
477 cs = ucp.uc_mcontext.mc_cs;
478 if (!CS_SECURE(cs)) {
479 kprintf("sigreturn: cs = 0x%x\n", cs);
480 trapsignal(lp, SIGBUS, T_PROTFLT);
483 bcopy(&ucp.uc_mcontext.mc_gs, regs, sizeof(struct trapframe));
487 * Restore the FPU state from the frame
490 npxpop(&ucp.uc_mcontext);
492 if (ucp.uc_mcontext.mc_onstack & 1)
493 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
495 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
497 lp->lwp_sigmask = ucp.uc_sigmask;
498 SIG_CANTMASK(lp->lwp_sigmask);
504 * cpu_idle() represents the idle LWKT. You cannot return from this function
505 * (unless you want to blow things up!). Instead we look for runnable threads
506 * and loop or halt as appropriate. Giant is not held on entry to the thread.
508 * The main loop is entered with a critical section held, we must release
509 * the critical section before doing anything else. lwkt_switch() will
510 * check for pending interrupts due to entering and exiting its own
513 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
514 * to wake a HLTed cpu up.
516 static int cpu_idle_hlt = 1;
517 static int cpu_idle_hltcnt;
518 static int cpu_idle_spincnt;
519 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
520 &cpu_idle_hlt, 0, "Idle loop HLT enable");
521 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
522 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
523 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
524 &cpu_idle_spincnt, 0, "Idle loop entry spins");
529 struct thread *td = curthread;
530 struct mdglobaldata *gd = mdcpu;
534 KKASSERT(td->td_critcount == 0);
538 * See if there are any LWKTs ready to go.
543 * The idle loop halts only if no threads are scheduleable
544 * and no signals have occured.
547 (td->td_gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
549 KKASSERT(MP_LOCK_HELD() == 0);
550 if ((td->td_gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
552 struct timeval tv1, tv2;
553 gettimeofday(&tv1, NULL);
555 reqflags = gd->mi.gd_reqflags &
556 ~RQF_IDLECHECK_WK_MASK;
557 umtx_sleep(&gd->mi.gd_reqflags, reqflags,
560 gettimeofday(&tv2, NULL);
561 if (tv2.tv_usec - tv1.tv_usec +
562 (tv2.tv_sec - tv1.tv_sec) * 1000000
564 kprintf("cpu %d idlelock %08x %08x\n",
574 __asm __volatile("pause");
581 * Called by the spinlock code with or without a critical section held
582 * when a spinlock is found to be seriously constested.
584 * We need to enter a critical section to prevent signals from recursing
588 cpu_spinlock_contested(void)
594 * Clear registers on exec
597 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
599 struct thread *td = curthread;
600 struct lwp *lp = td->td_lwp;
601 struct trapframe *regs = lp->lwp_md.md_regs;
602 struct pcb *pcb = lp->lwp_thread->td_pcb;
604 /* was i386_user_cleanup() in NetBSD */
607 bzero((char *)regs, sizeof(struct trapframe));
608 regs->tf_eip = entry;
609 regs->tf_esp = stack;
610 regs->tf_eflags = PSL_USER | (regs->tf_eflags & PSL_T);
618 /* PS_STRINGS value for BSD/OS binaries. It is 0 for non-BSD/OS. */
619 regs->tf_ebx = ps_strings;
622 * Reset the hardware debug registers if they were in use.
623 * They won't have any meaning for the newly exec'd process.
625 if (pcb->pcb_flags & PCB_DBREGS) {
632 if (pcb == td->td_pcb) {
634 * Clear the debug registers on the running
635 * CPU, otherwise they will end up affecting
636 * the next process we switch to.
640 pcb->pcb_flags &= ~PCB_DBREGS;
644 * Initialize the math emulator (if any) for the current process.
645 * Actually, just clear the bit that says that the emulator has
646 * been initialized. Initialization is delayed until the process
647 * traps to the emulator (if it is done at all) mainly because
648 * emulators don't provide an entry point for initialization.
650 pcb->pcb_flags &= ~FP_SOFTFP;
653 * note: do not set CR0_TS here. npxinit() must do it after clearing
654 * gd_npxthread. Otherwise a preemptive interrupt thread may panic
659 load_cr0(rcr0() | CR0_MP);
663 /* Initialize the npx (if any) for the current process. */
669 * note: linux emulator needs edx to be 0x0 on entry, which is
670 * handled in execve simply by setting the 64 bit syscall
682 cr0 |= CR0_NE; /* Done by npxinit() */
683 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
684 cr0 |= CR0_WP | CR0_AM;
691 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
694 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
696 if (!error && req->newptr)
701 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
702 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
704 extern u_long bootdev; /* not a cdev_t - encoding is different */
705 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
706 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
709 * Initialize 386 and configure to run kernel
713 * Initialize segments & interrupt table
716 extern struct user *proc0paddr;
721 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
722 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
723 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
724 IDTVEC(page), IDTVEC(mchk), IDTVEC(fpu), IDTVEC(align),
725 IDTVEC(xmm), IDTVEC(syscall),
728 IDTVEC(int0x80_syscall);
732 #ifdef DEBUG_INTERRUPTS
733 extern inthand_t *Xrsvdary[256];
737 ptrace_set_pc(struct lwp *lp, unsigned long addr)
739 lp->lwp_md.md_regs->tf_eip = addr;
744 ptrace_single_step(struct lwp *lp)
746 lp->lwp_md.md_regs->tf_eflags |= PSL_T;
751 fill_regs(struct lwp *lp, struct reg *regs)
753 struct trapframe *tp;
755 if ((tp = lp->lwp_md.md_regs) == NULL)
757 regs->r_gs = tp->tf_gs;
758 regs->r_fs = tp->tf_fs;
759 regs->r_es = tp->tf_es;
760 regs->r_ds = tp->tf_ds;
761 regs->r_edi = tp->tf_edi;
762 regs->r_esi = tp->tf_esi;
763 regs->r_ebp = tp->tf_ebp;
764 regs->r_ebx = tp->tf_ebx;
765 regs->r_edx = tp->tf_edx;
766 regs->r_ecx = tp->tf_ecx;
767 regs->r_eax = tp->tf_eax;
768 regs->r_eip = tp->tf_eip;
769 regs->r_cs = tp->tf_cs;
770 regs->r_eflags = tp->tf_eflags;
771 regs->r_esp = tp->tf_esp;
772 regs->r_ss = tp->tf_ss;
777 set_regs(struct lwp *lp, struct reg *regs)
779 struct trapframe *tp;
781 tp = lp->lwp_md.md_regs;
782 if (!EFL_SECURE(regs->r_eflags, tp->tf_eflags) ||
783 !CS_SECURE(regs->r_cs))
785 tp->tf_gs = regs->r_gs;
786 tp->tf_fs = regs->r_fs;
787 tp->tf_es = regs->r_es;
788 tp->tf_ds = regs->r_ds;
789 tp->tf_edi = regs->r_edi;
790 tp->tf_esi = regs->r_esi;
791 tp->tf_ebp = regs->r_ebp;
792 tp->tf_ebx = regs->r_ebx;
793 tp->tf_edx = regs->r_edx;
794 tp->tf_ecx = regs->r_ecx;
795 tp->tf_eax = regs->r_eax;
796 tp->tf_eip = regs->r_eip;
797 tp->tf_cs = regs->r_cs;
798 tp->tf_eflags = regs->r_eflags;
799 tp->tf_esp = regs->r_esp;
800 tp->tf_ss = regs->r_ss;
804 #ifndef CPU_DISABLE_SSE
806 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
808 struct env87 *penv_87 = &sv_87->sv_env;
809 struct envxmm *penv_xmm = &sv_xmm->sv_env;
812 /* FPU control/status */
813 penv_87->en_cw = penv_xmm->en_cw;
814 penv_87->en_sw = penv_xmm->en_sw;
815 penv_87->en_tw = penv_xmm->en_tw;
816 penv_87->en_fip = penv_xmm->en_fip;
817 penv_87->en_fcs = penv_xmm->en_fcs;
818 penv_87->en_opcode = penv_xmm->en_opcode;
819 penv_87->en_foo = penv_xmm->en_foo;
820 penv_87->en_fos = penv_xmm->en_fos;
823 for (i = 0; i < 8; ++i)
824 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
828 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
830 struct env87 *penv_87 = &sv_87->sv_env;
831 struct envxmm *penv_xmm = &sv_xmm->sv_env;
834 /* FPU control/status */
835 penv_xmm->en_cw = penv_87->en_cw;
836 penv_xmm->en_sw = penv_87->en_sw;
837 penv_xmm->en_tw = penv_87->en_tw;
838 penv_xmm->en_fip = penv_87->en_fip;
839 penv_xmm->en_fcs = penv_87->en_fcs;
840 penv_xmm->en_opcode = penv_87->en_opcode;
841 penv_xmm->en_foo = penv_87->en_foo;
842 penv_xmm->en_fos = penv_87->en_fos;
845 for (i = 0; i < 8; ++i)
846 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
848 #endif /* CPU_DISABLE_SSE */
851 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
853 if (lp->lwp_thread == NULL || lp->lwp_thread->td_pcb == NULL)
855 #ifndef CPU_DISABLE_SSE
857 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
858 (struct save87 *)fpregs);
861 #endif /* CPU_DISABLE_SSE */
862 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
867 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
869 #ifndef CPU_DISABLE_SSE
871 set_fpregs_xmm((struct save87 *)fpregs,
872 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
875 #endif /* CPU_DISABLE_SSE */
876 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
881 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
887 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
894 * Return > 0 if a hardware breakpoint has been hit, and the
895 * breakpoint was in user space. Return 0, otherwise.
898 user_dbreg_trap(void)
900 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
901 u_int32_t bp; /* breakpoint bits extracted from dr6 */
902 int nbp; /* number of breakpoints that triggered */
903 caddr_t addr[4]; /* breakpoint addresses */
907 if ((dr7 & 0x000000ff) == 0) {
909 * all GE and LE bits in the dr7 register are zero,
910 * thus the trap couldn't have been caused by the
911 * hardware debug registers
918 bp = dr6 & 0x0000000f;
922 * None of the breakpoint bits are set meaning this
923 * trap was not caused by any of the debug registers
929 * at least one of the breakpoints were hit, check to see
930 * which ones and if any of them are user space addresses
934 addr[nbp++] = (caddr_t)rdr0();
937 addr[nbp++] = (caddr_t)rdr1();
940 addr[nbp++] = (caddr_t)rdr2();
943 addr[nbp++] = (caddr_t)rdr3();
946 for (i=0; i<nbp; i++) {
948 (caddr_t)VM_MAX_USER_ADDRESS) {
950 * addr[i] is in user space
957 * None of the breakpoints are in user space.
970 cpu_feature = regs[3];
976 Debugger(const char *msg)
978 kprintf("Debugger(\"%s\") called.\n", msg);