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 $
42 #include "opt_compat.h"
44 #include "opt_directio.h"
46 #include "opt_msgbuf.h"
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/sysproto.h>
52 #include <sys/signalvar.h>
53 #include <sys/kernel.h>
54 #include <sys/linker.h>
55 #include <sys/malloc.h>
58 #include <sys/reboot.h>
60 #include <sys/msgbuf.h>
61 #include <sys/sysent.h>
62 #include <sys/sysctl.h>
63 #include <sys/vmmeter.h>
65 #include <sys/usched.h>
69 #include <vm/vm_param.h>
71 #include <vm/vm_kern.h>
72 #include <vm/vm_object.h>
73 #include <vm/vm_page.h>
74 #include <vm/vm_map.h>
75 #include <vm/vm_pager.h>
76 #include <vm/vm_extern.h>
78 #include <sys/thread2.h>
79 #include <sys/mplock2.h>
87 #include <machine/cpu.h>
88 #include <machine/clock.h>
89 #include <machine/specialreg.h>
90 #include <machine/md_var.h>
91 #include <machine/pcb_ext.h> /* pcb.h included via sys/user.h */
92 #include <machine/globaldata.h> /* CPU_prvspace */
93 #include <machine/smp.h>
95 #include <machine/perfmon.h>
97 #include <machine/cputypes.h>
99 #include <bus/isa/rtc.h>
100 #include <sys/random.h>
101 #include <sys/ptrace.h>
102 #include <machine/sigframe.h>
103 #include <unistd.h> /* umtx_* functions */
104 #include <pthread.h> /* pthread_yield() */
106 extern void dblfault_handler (void);
108 static void set_fpregs_xmm (struct save87 *, struct savexmm *);
109 static void fill_fpregs_xmm (struct savexmm *, struct save87 *);
111 extern void ffs_rawread_setup(void);
112 #endif /* DIRECTIO */
114 int64_t tsc_offsets[MAXCPU];
116 #if defined(SWTCH_OPTIM_STATS)
117 extern int swtch_optim_stats;
118 SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
119 CTLFLAG_RD, &swtch_optim_stats, 0, "");
120 SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
121 CTLFLAG_RD, &tlb_flush_count, 0, "");
125 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
127 u_long pmem = ctob(physmem);
129 int error = sysctl_handle_long(oidp, &pmem, 0, req);
133 SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD,
134 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)");
137 sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
140 int error = sysctl_handle_int(oidp, 0,
141 ctob((int)Maxmem - vmstats.v_wire_count), req);
145 SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
146 0, 0, sysctl_hw_usermem, "IU", "");
148 SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &Maxmem, 0, "");
153 sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
157 /* Unwind the buffer, so that it's linear (possibly starting with
158 * some initial nulls).
160 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr+msgbufp->msg_bufr,
161 msgbufp->msg_size-msgbufp->msg_bufr,req);
162 if(error) return(error);
163 if(msgbufp->msg_bufr>0) {
164 error=sysctl_handle_opaque(oidp,msgbufp->msg_ptr,
165 msgbufp->msg_bufr,req);
170 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
171 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
173 static int msgbuf_clear;
176 sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
179 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
181 if (!error && req->newptr) {
182 /* Clear the buffer and reset write pointer */
183 bzero(msgbufp->msg_ptr,msgbufp->msg_size);
184 msgbufp->msg_bufr=msgbufp->msg_bufx=0;
190 SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
191 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
192 "Clear kernel message buffer");
197 * Send an interrupt to process.
199 * Stack is set up to allow sigcode stored
200 * at top to call routine, followed by kcall
201 * to sigreturn routine below. After sigreturn
202 * resets the signal mask, the stack, and the
203 * frame pointer, it returns to the user
207 sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
209 struct lwp *lp = curthread->td_lwp;
210 struct proc *p = lp->lwp_proc;
211 struct trapframe *regs;
212 struct sigacts *psp = p->p_sigacts;
213 struct sigframe sf, *sfp;
217 regs = lp->lwp_md.md_regs;
218 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
220 /* Save user context */
221 bzero(&sf, sizeof(struct sigframe));
222 sf.sf_uc.uc_sigmask = *mask;
223 sf.sf_uc.uc_stack = lp->lwp_sigstk;
224 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
225 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0);
226 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
228 /* Make the size of the saved context visible to userland */
229 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
231 /* Allocate and validate space for the signal handler context. */
232 if ((lp->lwp_flags & LWP_ALTSTACK) != 0 && !oonstack &&
233 SIGISMEMBER(psp->ps_sigonstack, sig)) {
234 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size -
235 sizeof(struct sigframe));
236 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
238 /* We take red zone into account */
239 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
242 /* Align to 16 bytes */
243 sfp = (struct sigframe *)((intptr_t)sp & ~0xFUL);
245 /* Translate the signal is appropriate */
246 if (p->p_sysent->sv_sigtbl) {
247 if (sig <= p->p_sysent->sv_sigsize)
248 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
252 * Build the argument list for the signal handler.
254 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx)
256 regs->tf_rdi = sig; /* argument 1 */
257 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */
259 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
261 * Signal handler installed with SA_SIGINFO.
263 * action(signo, siginfo, ucontext)
265 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */
266 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */
267 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
269 /* fill siginfo structure */
270 sf.sf_si.si_signo = sig;
271 sf.sf_si.si_code = code;
272 sf.sf_si.si_addr = (void *)regs->tf_addr;
275 * Old FreeBSD-style arguments.
277 * handler (signo, code, [uc], addr)
279 regs->tf_rsi = (register_t)code; /* argument 2 */
280 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */
281 sf.sf_ahu.sf_handler = catcher;
286 * If we're a vm86 process, we want to save the segment registers.
287 * We also change eflags to be our emulated eflags, not the actual
290 if (regs->tf_eflags & PSL_VM) {
291 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
292 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
294 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
295 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
296 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
297 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
299 if (vm86->vm86_has_vme == 0)
300 sf.sf_uc.uc_mcontext.mc_eflags =
301 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
302 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
305 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
306 * syscalls made by the signal handler. This just avoids
307 * wasting time for our lazy fixup of such faults. PSL_NT
308 * does nothing in vm86 mode, but vm86 programs can set it
309 * almost legitimately in probes for old cpu types.
311 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
316 * Save the FPU state and reinit the FP unit
318 npxpush(&sf.sf_uc.uc_mcontext);
321 * Copy the sigframe out to the user's stack.
323 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
325 * Something is wrong with the stack pointer.
326 * ...Kill the process.
331 regs->tf_rsp = (register_t)sfp;
332 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
335 * i386 abi specifies that the direction flag must be cleared
338 regs->tf_rflags &= ~(PSL_T|PSL_D);
341 * 64 bit mode has a code and stack selector but
342 * no data or extra selector. %fs and %gs are not
345 regs->tf_cs = _ucodesel;
346 regs->tf_ss = _udatasel;
350 * Sanitize the trapframe for a virtual kernel passing control to a custom
351 * VM context. Remove any items that would otherwise create a privilage
354 * XXX at the moment we allow userland to set the resume flag. Is this a
358 cpu_sanitize_frame(struct trapframe *frame)
360 frame->tf_cs = _ucodesel;
361 frame->tf_ss = _udatasel;
362 /* XXX VM (8086) mode not supported? */
363 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP);
364 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I;
370 * Sanitize the tls so loading the descriptor does not blow up
371 * on us. For x86_64 we don't have to do anything.
374 cpu_sanitize_tls(struct savetls *tls)
380 * sigreturn(ucontext_t *sigcntxp)
382 * System call to cleanup state after a signal
383 * has been taken. Reset signal mask and
384 * stack state from context left by sendsig (above).
385 * Return to previous pc and psl as specified by
386 * context left by sendsig. Check carefully to
387 * make sure that the user has not modified the
388 * state to gain improper privileges.
390 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
391 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
394 sys_sigreturn(struct sigreturn_args *uap)
396 struct lwp *lp = curthread->td_lwp;
397 struct trapframe *regs;
405 * We have to copy the information into kernel space so userland
406 * can't modify it while we are sniffing it.
408 regs = lp->lwp_md.md_regs;
409 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
413 rflags = ucp->uc_mcontext.mc_rflags;
415 /* VM (8086) mode not supported */
416 rflags &= ~PSL_VM_UNSUPP;
419 if (eflags & PSL_VM) {
420 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
421 struct vm86_kernel *vm86;
424 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
425 * set up the vm86 area, and we can't enter vm86 mode.
427 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
429 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
430 if (vm86->vm86_inited == 0)
433 /* go back to user mode if both flags are set */
434 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
435 trapsignal(lp->lwp_proc, SIGBUS, 0);
437 if (vm86->vm86_has_vme) {
438 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
439 (eflags & VME_USERCHANGE) | PSL_VM;
441 vm86->vm86_eflags = eflags; /* save VIF, VIP */
442 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
444 bcopy(&ucp.uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
445 tf->tf_eflags = eflags;
446 tf->tf_vm86_ds = tf->tf_ds;
447 tf->tf_vm86_es = tf->tf_es;
448 tf->tf_vm86_fs = tf->tf_fs;
449 tf->tf_vm86_gs = tf->tf_gs;
450 tf->tf_ds = _udatasel;
451 tf->tf_es = _udatasel;
453 tf->tf_fs = _udatasel;
454 tf->tf_gs = _udatasel;
460 * Don't allow users to change privileged or reserved flags.
463 * XXX do allow users to change the privileged flag PSL_RF.
464 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
465 * should sometimes set it there too. tf_eflags is kept in
466 * the signal context during signal handling and there is no
467 * other place to remember it, so the PSL_RF bit may be
468 * corrupted by the signal handler without us knowing.
469 * Corruption of the PSL_RF bit at worst causes one more or
470 * one less debugger trap, so allowing it is fairly harmless.
472 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
473 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags);
478 * Don't allow users to load a valid privileged %cs. Let the
479 * hardware check for invalid selectors, excess privilege in
480 * other selectors, invalid %eip's and invalid %esp's.
482 cs = ucp->uc_mcontext.mc_cs;
483 if (!CS_SECURE(cs)) {
484 kprintf("sigreturn: cs = 0x%x\n", cs);
485 trapsignal(lp, SIGBUS, T_PROTFLT);
488 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe));
492 * Restore the FPU state from the frame
494 npxpop(&ucp->uc_mcontext);
496 if (ucp->uc_mcontext.mc_onstack & 1)
497 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
499 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
501 lp->lwp_sigmask = ucp->uc_sigmask;
502 SIG_CANTMASK(lp->lwp_sigmask);
507 * cpu_idle() represents the idle LWKT. You cannot return from this function
508 * (unless you want to blow things up!). Instead we look for runnable threads
509 * and loop or halt as appropriate. Giant is not held on entry to the thread.
511 * The main loop is entered with a critical section held, we must release
512 * the critical section before doing anything else. lwkt_switch() will
513 * check for pending interrupts due to entering and exiting its own
516 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
517 * to wake a HLTed cpu up.
519 static int cpu_idle_hlt = 1;
520 static int cpu_idle_hltcnt;
521 static int cpu_idle_spincnt;
522 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
523 &cpu_idle_hlt, 0, "Idle loop HLT enable");
524 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
525 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
526 SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
527 &cpu_idle_spincnt, 0, "Idle loop entry spins");
532 struct thread *td = curthread;
533 struct mdglobaldata *gd = mdcpu;
537 KKASSERT(td->td_critcount == 0);
542 * See if there are any LWKTs ready to go.
547 * The idle loop halts only if no threads are scheduleable
548 * and no signals have occured.
551 (td->td_gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
553 if ((td->td_gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
555 struct timeval tv1, tv2;
556 gettimeofday(&tv1, NULL);
558 reqflags = gd->mi.gd_reqflags &
559 ~RQF_IDLECHECK_WK_MASK;
560 KKASSERT(gd->mi.gd_processing_ipiq == 0);
561 umtx_sleep(&gd->mi.gd_reqflags, reqflags,
564 gettimeofday(&tv2, NULL);
565 if (tv2.tv_usec - tv1.tv_usec +
566 (tv2.tv_sec - tv1.tv_sec) * 1000000
568 kprintf("cpu %d idlelock %08x %08x\n",
578 __asm __volatile("pause");
585 * Called by the spinlock code with or without a critical section held
586 * when a spinlock is found to be seriously constested.
588 * We need to enter a critical section to prevent signals from recursing
592 cpu_spinlock_contested(void)
598 * Clear registers on exec
601 exec_setregs(u_long entry, u_long stack, u_long ps_strings)
603 struct thread *td = curthread;
604 struct lwp *lp = td->td_lwp;
605 struct pcb *pcb = td->td_pcb;
606 struct trapframe *regs = lp->lwp_md.md_regs;
608 /* was i386_user_cleanup() in NetBSD */
611 bzero((char *)regs, sizeof(struct trapframe));
612 regs->tf_rip = entry;
613 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */
614 regs->tf_rdi = stack; /* argv */
615 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
616 regs->tf_ss = _udatasel;
617 regs->tf_cs = _ucodesel;
618 regs->tf_rbx = ps_strings;
621 * Reset the hardware debug registers if they were in use.
622 * They won't have any meaning for the newly exec'd process.
624 if (pcb->pcb_flags & PCB_DBREGS) {
630 pcb->pcb_dr7 = 0; /* JG set bit 10? */
631 if (pcb == td->td_pcb) {
633 * Clear the debug registers on the running
634 * CPU, otherwise they will end up affecting
635 * the next process we switch to.
639 pcb->pcb_flags &= ~PCB_DBREGS;
643 * Initialize the math emulator (if any) for the current process.
644 * Actually, just clear the bit that says that the emulator has
645 * been initialized. Initialization is delayed until the process
646 * traps to the emulator (if it is done at all) mainly because
647 * emulators don't provide an entry point for initialization.
649 pcb->pcb_flags &= ~FP_SOFTFP;
652 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing
653 * gd_npxthread. Otherwise a preemptive interrupt thread
654 * may panic in npxdna().
658 load_cr0(rcr0() | CR0_MP);
662 * NOTE: The MSR values must be correct so we can return to
663 * userland. gd_user_fs/gs must be correct so the switch
664 * code knows what the current MSR values are.
666 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */
668 /* Initialize the npx (if any) for the current process. */
673 * note: linux emulator needs edx to be 0x0 on entry, which is
674 * handled in execve simply by setting the 64 bit syscall
686 cr0 |= CR0_NE; /* Done by npxinit() */
687 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
688 cr0 |= CR0_WP | CR0_AM;
695 sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
698 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
700 if (!error && req->newptr)
705 SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
706 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
708 extern u_long bootdev; /* not a cdev_t - encoding is different */
709 SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
710 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
713 * Initialize 386 and configure to run kernel
717 * Initialize segments & interrupt table
720 extern struct user *proc0paddr;
725 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
726 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
727 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
728 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
729 IDTVEC(xmm), IDTVEC(dblfault),
730 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
733 #ifdef DEBUG_INTERRUPTS
734 extern inthand_t *Xrsvdary[256];
738 ptrace_set_pc(struct lwp *lp, unsigned long addr)
740 lp->lwp_md.md_regs->tf_rip = addr;
745 ptrace_single_step(struct lwp *lp)
747 lp->lwp_md.md_regs->tf_rflags |= PSL_T;
752 fill_regs(struct lwp *lp, struct reg *regs)
754 struct trapframe *tp;
756 if ((tp = lp->lwp_md.md_regs) == NULL)
758 bcopy(&tp->tf_rdi, ®s->r_rdi, sizeof(*regs));
763 set_regs(struct lwp *lp, struct reg *regs)
765 struct trapframe *tp;
767 tp = lp->lwp_md.md_regs;
768 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
769 !CS_SECURE(regs->r_cs))
771 bcopy(®s->r_rdi, &tp->tf_rdi, sizeof(*regs));
776 fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
778 struct env87 *penv_87 = &sv_87->sv_env;
779 struct envxmm *penv_xmm = &sv_xmm->sv_env;
782 /* FPU control/status */
783 penv_87->en_cw = penv_xmm->en_cw;
784 penv_87->en_sw = penv_xmm->en_sw;
785 penv_87->en_tw = penv_xmm->en_tw;
786 penv_87->en_fip = penv_xmm->en_fip;
787 penv_87->en_fcs = penv_xmm->en_fcs;
788 penv_87->en_opcode = penv_xmm->en_opcode;
789 penv_87->en_foo = penv_xmm->en_foo;
790 penv_87->en_fos = penv_xmm->en_fos;
793 for (i = 0; i < 8; ++i)
794 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
798 set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
800 struct env87 *penv_87 = &sv_87->sv_env;
801 struct envxmm *penv_xmm = &sv_xmm->sv_env;
804 /* FPU control/status */
805 penv_xmm->en_cw = penv_87->en_cw;
806 penv_xmm->en_sw = penv_87->en_sw;
807 penv_xmm->en_tw = penv_87->en_tw;
808 penv_xmm->en_fip = penv_87->en_fip;
809 penv_xmm->en_fcs = penv_87->en_fcs;
810 penv_xmm->en_opcode = penv_87->en_opcode;
811 penv_xmm->en_foo = penv_87->en_foo;
812 penv_xmm->en_fos = penv_87->en_fos;
815 for (i = 0; i < 8; ++i)
816 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
820 fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
822 if (lp->lwp_thread == NULL || lp->lwp_thread->td_pcb == NULL)
825 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
826 (struct save87 *)fpregs);
829 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
834 set_fpregs(struct lwp *lp, struct fpreg *fpregs)
837 set_fpregs_xmm((struct save87 *)fpregs,
838 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
841 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
846 fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
852 set_dbregs(struct lwp *lp, struct dbreg *dbregs)
859 * Return > 0 if a hardware breakpoint has been hit, and the
860 * breakpoint was in user space. Return 0, otherwise.
863 user_dbreg_trap(void)
865 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
866 u_int32_t bp; /* breakpoint bits extracted from dr6 */
867 int nbp; /* number of breakpoints that triggered */
868 caddr_t addr[4]; /* breakpoint addresses */
872 if ((dr7 & 0x000000ff) == 0) {
874 * all GE and LE bits in the dr7 register are zero,
875 * thus the trap couldn't have been caused by the
876 * hardware debug registers
883 bp = dr6 & 0x0000000f;
887 * None of the breakpoint bits are set meaning this
888 * trap was not caused by any of the debug registers
894 * at least one of the breakpoints were hit, check to see
895 * which ones and if any of them are user space addresses
899 addr[nbp++] = (caddr_t)rdr0();
902 addr[nbp++] = (caddr_t)rdr1();
905 addr[nbp++] = (caddr_t)rdr2();
908 addr[nbp++] = (caddr_t)rdr3();
911 for (i=0; i<nbp; i++) {
913 (caddr_t)VM_MAX_USER_ADDRESS) {
915 * addr[i] is in user space
922 * None of the breakpoints are in user space.
935 cpu_feature = regs[3];
941 Debugger(const char *msg)
943 kprintf("Debugger(\"%s\") called.\n", msg);