Remove upc_{control,register} syscalls and everything that has to do with it.
[dragonfly.git] / sys / platform / vkernel64 / x86_64 / cpu_regs.c
CommitLineData
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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 $
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40 */
41
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42#include "opt_compat.h"
43#include "opt_ddb.h"
44#include "opt_directio.h"
45#include "opt_inet.h"
46#include "opt_ipx.h"
47#include "opt_msgbuf.h"
48#include "opt_swap.h"
49
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>
57#include <sys/proc.h>
58#include <sys/buf.h>
59#include <sys/reboot.h>
60#include <sys/mbuf.h>
61#include <sys/msgbuf.h>
62#include <sys/sysent.h>
63#include <sys/sysctl.h>
64#include <sys/vmmeter.h>
65#include <sys/bus.h>
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66#include <sys/usched.h>
67#include <sys/reg.h>
68
69#include <vm/vm.h>
70#include <vm/vm_param.h>
71#include <sys/lock.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>
78
79#include <sys/thread2.h>
0e6594a8 80#include <sys/mplock2.h>
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81
82#include <sys/user.h>
83#include <sys/exec.h>
84#include <sys/cons.h>
85
86#include <ddb/ddb.h>
87
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>
95#ifdef PERFMON
96#include <machine/perfmon.h>
97#endif
98#include <machine/cputypes.h>
99
100#include <bus/isa/rtc.h>
101#include <sys/random.h>
102#include <sys/ptrace.h>
103#include <machine/sigframe.h>
104#include <unistd.h> /* umtx_* functions */
b68e846f 105#include <pthread.h> /* pthread_yield() */
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106
107extern void dblfault_handler (void);
108
109#ifndef CPU_DISABLE_SSE
110static void set_fpregs_xmm (struct save87 *, struct savexmm *);
111static void fill_fpregs_xmm (struct savexmm *, struct save87 *);
112#endif /* CPU_DISABLE_SSE */
113#ifdef DIRECTIO
114extern void ffs_rawread_setup(void);
115#endif /* DIRECTIO */
116
da673940 117int64_t tsc_offsets[MAXCPU];
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118
119#if defined(SWTCH_OPTIM_STATS)
120extern int swtch_optim_stats;
121SYSCTL_INT(_debug, OID_AUTO, swtch_optim_stats,
122 CTLFLAG_RD, &swtch_optim_stats, 0, "");
123SYSCTL_INT(_debug, OID_AUTO, tlb_flush_count,
124 CTLFLAG_RD, &tlb_flush_count, 0, "");
125#endif
126
127static int
128sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
129{
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130 u_long pmem = ctob(physmem);
131
132 int error = sysctl_handle_long(oidp, &pmem, 0, req);
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133 return (error);
134}
135
39d69dae 136SYSCTL_PROC(_hw, HW_PHYSMEM, physmem, CTLTYPE_ULONG|CTLFLAG_RD,
9b9532a0 137 0, 0, sysctl_hw_physmem, "LU", "Total system memory in bytes (number of pages * page size)");
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138
139static int
140sysctl_hw_usermem(SYSCTL_HANDLER_ARGS)
141{
142 /* JG */
143 int error = sysctl_handle_int(oidp, 0,
144 ctob((int)Maxmem - vmstats.v_wire_count), req);
145 return (error);
146}
147
148SYSCTL_PROC(_hw, HW_USERMEM, usermem, CTLTYPE_INT|CTLFLAG_RD,
149 0, 0, sysctl_hw_usermem, "IU", "");
150
151SYSCTL_ULONG(_hw, OID_AUTO, availpages, CTLFLAG_RD, &Maxmem, 0, "");
152
153#if 0
154
155static int
156sysctl_machdep_msgbuf(SYSCTL_HANDLER_ARGS)
157{
158 int error;
159
160 /* Unwind the buffer, so that it's linear (possibly starting with
161 * some initial nulls).
162 */
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);
169 }
170 return(error);
171}
172
173SYSCTL_PROC(_machdep, OID_AUTO, msgbuf, CTLTYPE_STRING|CTLFLAG_RD,
174 0, 0, sysctl_machdep_msgbuf, "A","Contents of kernel message buffer");
175
176static int msgbuf_clear;
177
178static int
179sysctl_machdep_msgbuf_clear(SYSCTL_HANDLER_ARGS)
180{
181 int error;
182 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
183 req);
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;
188 msgbuf_clear=0;
189 }
190 return (error);
191}
192
193SYSCTL_PROC(_machdep, OID_AUTO, msgbuf_clear, CTLTYPE_INT|CTLFLAG_RW,
194 &msgbuf_clear, 0, sysctl_machdep_msgbuf_clear, "I",
195 "Clear kernel message buffer");
196
197#endif
198
199/*
200 * Send an interrupt to process.
201 *
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
207 * specified pc, psl.
208 */
209void
210sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
211{
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;
217 int oonstack;
218 char *sp;
219
220 regs = lp->lwp_md.md_regs;
221 oonstack = (lp->lwp_sigstk.ss_flags & SS_ONSTACK) ? 1 : 0;
222
223 /* Save user context */
224 bzero(&sf, sizeof(struct sigframe));
225 sf.sf_uc.uc_sigmask = *mask;
226 sf.sf_uc.uc_stack = lp->lwp_sigstk;
227 sf.sf_uc.uc_mcontext.mc_onstack = oonstack;
228 KKASSERT(__offsetof(struct trapframe, tf_rdi) == 0);
229 bcopy(regs, &sf.sf_uc.uc_mcontext.mc_rdi, sizeof(struct trapframe));
230
231 /* Make the size of the saved context visible to userland */
232 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext);
233
da673940 234 /* Allocate and validate space for the signal handler context. */
4643740a 235 if ((lp->lwp_flags & LWP_ALTSTACK) != 0 && !oonstack &&
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236 SIGISMEMBER(psp->ps_sigonstack, sig)) {
237 sp = (char *)(lp->lwp_sigstk.ss_sp + lp->lwp_sigstk.ss_size -
238 sizeof(struct sigframe));
239 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
240 } else {
241 /* We take red zone into account */
242 sp = (char *)regs->tf_rsp - sizeof(struct sigframe) - 128;
243 }
244
245 /* Align to 16 bytes */
246 sfp = (struct sigframe *)((intptr_t)sp & ~0xFUL);
247
248 /* Translate the signal is appropriate */
249 if (p->p_sysent->sv_sigtbl) {
250 if (sig <= p->p_sysent->sv_sigsize)
251 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
252 }
253
254 /*
255 * Build the argument list for the signal handler.
256 *
257 * Arguments are in registers (%rdi, %rsi, %rdx, %rcx)
258 */
259 regs->tf_rdi = sig; /* argument 1 */
260 regs->tf_rdx = (register_t)&sfp->sf_uc; /* argument 3 */
261
262 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
263 /*
264 * Signal handler installed with SA_SIGINFO.
265 *
266 * action(signo, siginfo, ucontext)
267 */
268 regs->tf_rsi = (register_t)&sfp->sf_si; /* argument 2 */
269 regs->tf_rcx = (register_t)regs->tf_err; /* argument 4 */
270 sf.sf_ahu.sf_action = (__siginfohandler_t *)catcher;
271
272 /* fill siginfo structure */
273 sf.sf_si.si_signo = sig;
274 sf.sf_si.si_code = code;
c55fa5ee 275 sf.sf_si.si_addr = (void *)regs->tf_addr;
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276 } else {
277 /*
278 * Old FreeBSD-style arguments.
279 *
280 * handler (signo, code, [uc], addr)
281 */
282 regs->tf_rsi = (register_t)code; /* argument 2 */
1a482e3f 283 regs->tf_rcx = (register_t)regs->tf_addr; /* argument 4 */
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284 sf.sf_ahu.sf_handler = catcher;
285 }
286
287#if 0
288 /*
289 * If we're a vm86 process, we want to save the segment registers.
290 * We also change eflags to be our emulated eflags, not the actual
291 * eflags.
292 */
293 if (regs->tf_eflags & PSL_VM) {
294 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
295 struct vm86_kernel *vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
296
297 sf.sf_uc.uc_mcontext.mc_gs = tf->tf_vm86_gs;
298 sf.sf_uc.uc_mcontext.mc_fs = tf->tf_vm86_fs;
299 sf.sf_uc.uc_mcontext.mc_es = tf->tf_vm86_es;
300 sf.sf_uc.uc_mcontext.mc_ds = tf->tf_vm86_ds;
301
302 if (vm86->vm86_has_vme == 0)
303 sf.sf_uc.uc_mcontext.mc_eflags =
304 (tf->tf_eflags & ~(PSL_VIF | PSL_VIP)) |
305 (vm86->vm86_eflags & (PSL_VIF | PSL_VIP));
306
307 /*
308 * Clear PSL_NT to inhibit T_TSSFLT faults on return from
309 * syscalls made by the signal handler. This just avoids
310 * wasting time for our lazy fixup of such faults. PSL_NT
311 * does nothing in vm86 mode, but vm86 programs can set it
312 * almost legitimately in probes for old cpu types.
313 */
314 tf->tf_eflags &= ~(PSL_VM | PSL_NT | PSL_VIF | PSL_VIP);
315 }
316#endif
317
318 /*
319 * Save the FPU state and reinit the FP unit
320 */
321 npxpush(&sf.sf_uc.uc_mcontext);
322
323 /*
324 * Copy the sigframe out to the user's stack.
325 */
326 if (copyout(&sf, sfp, sizeof(struct sigframe)) != 0) {
327 /*
328 * Something is wrong with the stack pointer.
329 * ...Kill the process.
330 */
331 sigexit(lp, SIGILL);
332 }
333
334 regs->tf_rsp = (register_t)sfp;
335 regs->tf_rip = PS_STRINGS - *(p->p_sysent->sv_szsigcode);
336
337 /*
338 * i386 abi specifies that the direction flag must be cleared
339 * on function entry
340 */
341 regs->tf_rflags &= ~(PSL_T|PSL_D);
342
343 /*
344 * 64 bit mode has a code and stack selector but
345 * no data or extra selector. %fs and %gs are not
346 * stored in-context.
347 */
348 regs->tf_cs = _ucodesel;
349 regs->tf_ss = _udatasel;
350}
351
352/*
353 * Sanitize the trapframe for a virtual kernel passing control to a custom
354 * VM context. Remove any items that would otherwise create a privilage
355 * issue.
356 *
357 * XXX at the moment we allow userland to set the resume flag. Is this a
358 * bad idea?
359 */
360int
361cpu_sanitize_frame(struct trapframe *frame)
362{
363 frame->tf_cs = _ucodesel;
364 frame->tf_ss = _udatasel;
365 /* XXX VM (8086) mode not supported? */
366 frame->tf_rflags &= (PSL_RF | PSL_USERCHANGE | PSL_VM_UNSUPP);
367 frame->tf_rflags |= PSL_RESERVED_DEFAULT | PSL_I;
368
369 return(0);
370}
371
372/*
373 * Sanitize the tls so loading the descriptor does not blow up
a76ca9b9 374 * on us. For x86_64 we don't have to do anything.
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375 */
376int
377cpu_sanitize_tls(struct savetls *tls)
378{
379 return(0);
380}
381
382/*
383 * sigreturn(ucontext_t *sigcntxp)
384 *
385 * System call to cleanup state after a signal
386 * has been taken. Reset signal mask and
387 * stack state from context left by sendsig (above).
388 * Return to previous pc and psl as specified by
389 * context left by sendsig. Check carefully to
390 * make sure that the user has not modified the
391 * state to gain improper privileges.
392 */
393#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
394#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
395
396int
397sys_sigreturn(struct sigreturn_args *uap)
398{
399 struct lwp *lp = curthread->td_lwp;
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400 struct trapframe *regs;
401 ucontext_t uc;
402 ucontext_t *ucp;
403 register_t rflags;
404 int cs;
405 int error;
406
407 /*
408 * We have to copy the information into kernel space so userland
409 * can't modify it while we are sniffing it.
410 */
411 regs = lp->lwp_md.md_regs;
412 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
413 if (error)
414 return (error);
415 ucp = &uc;
416 rflags = ucp->uc_mcontext.mc_rflags;
417
418 /* VM (8086) mode not supported */
419 rflags &= ~PSL_VM_UNSUPP;
420
421#if 0
422 if (eflags & PSL_VM) {
423 struct trapframe_vm86 *tf = (struct trapframe_vm86 *)regs;
424 struct vm86_kernel *vm86;
425
426 /*
427 * if pcb_ext == 0 or vm86_inited == 0, the user hasn't
428 * set up the vm86 area, and we can't enter vm86 mode.
429 */
430 if (lp->lwp_thread->td_pcb->pcb_ext == 0)
431 return (EINVAL);
432 vm86 = &lp->lwp_thread->td_pcb->pcb_ext->ext_vm86;
433 if (vm86->vm86_inited == 0)
434 return (EINVAL);
435
436 /* go back to user mode if both flags are set */
437 if ((eflags & PSL_VIP) && (eflags & PSL_VIF))
438 trapsignal(lp->lwp_proc, SIGBUS, 0);
439
440 if (vm86->vm86_has_vme) {
441 eflags = (tf->tf_eflags & ~VME_USERCHANGE) |
442 (eflags & VME_USERCHANGE) | PSL_VM;
443 } else {
444 vm86->vm86_eflags = eflags; /* save VIF, VIP */
445 eflags = (tf->tf_eflags & ~VM_USERCHANGE) | (eflags & VM_USERCHANGE) | PSL_VM;
446 }
447 bcopy(&ucp.uc_mcontext.mc_gs, tf, sizeof(struct trapframe));
448 tf->tf_eflags = eflags;
449 tf->tf_vm86_ds = tf->tf_ds;
450 tf->tf_vm86_es = tf->tf_es;
451 tf->tf_vm86_fs = tf->tf_fs;
452 tf->tf_vm86_gs = tf->tf_gs;
453 tf->tf_ds = _udatasel;
454 tf->tf_es = _udatasel;
455#if 0
456 tf->tf_fs = _udatasel;
457 tf->tf_gs = _udatasel;
458#endif
459 } else
460#endif
461 {
462 /*
463 * Don't allow users to change privileged or reserved flags.
464 */
465 /*
466 * XXX do allow users to change the privileged flag PSL_RF.
467 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
468 * should sometimes set it there too. tf_eflags is kept in
469 * the signal context during signal handling and there is no
470 * other place to remember it, so the PSL_RF bit may be
471 * corrupted by the signal handler without us knowing.
472 * Corruption of the PSL_RF bit at worst causes one more or
473 * one less debugger trap, so allowing it is fairly harmless.
474 */
475 if (!EFL_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
476 kprintf("sigreturn: rflags = 0x%lx\n", (long)rflags);
477 return(EINVAL);
478 }
479
480 /*
481 * Don't allow users to load a valid privileged %cs. Let the
482 * hardware check for invalid selectors, excess privilege in
483 * other selectors, invalid %eip's and invalid %esp's.
484 */
485 cs = ucp->uc_mcontext.mc_cs;
486 if (!CS_SECURE(cs)) {
487 kprintf("sigreturn: cs = 0x%x\n", cs);
488 trapsignal(lp, SIGBUS, T_PROTFLT);
489 return(EINVAL);
490 }
491 bcopy(&ucp->uc_mcontext.mc_rdi, regs, sizeof(struct trapframe));
492 }
493
494 /*
495 * Restore the FPU state from the frame
496 */
497 npxpop(&ucp->uc_mcontext);
498
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499 if (ucp->uc_mcontext.mc_onstack & 1)
500 lp->lwp_sigstk.ss_flags |= SS_ONSTACK;
501 else
502 lp->lwp_sigstk.ss_flags &= ~SS_ONSTACK;
503
504 lp->lwp_sigmask = ucp->uc_sigmask;
505 SIG_CANTMASK(lp->lwp_sigmask);
506 return(EJUSTRETURN);
507}
508
509/*
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510 * cpu_idle() represents the idle LWKT. You cannot return from this function
511 * (unless you want to blow things up!). Instead we look for runnable threads
512 * and loop or halt as appropriate. Giant is not held on entry to the thread.
513 *
514 * The main loop is entered with a critical section held, we must release
515 * the critical section before doing anything else. lwkt_switch() will
516 * check for pending interrupts due to entering and exiting its own
517 * critical section.
518 *
519 * Note on cpu_idle_hlt: On an SMP system we rely on a scheduler IPI
b12defdc 520 * to wake a HLTed cpu up.
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521 */
522static int cpu_idle_hlt = 1;
523static int cpu_idle_hltcnt;
524static int cpu_idle_spincnt;
525SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
526 &cpu_idle_hlt, 0, "Idle loop HLT enable");
527SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hltcnt, CTLFLAG_RW,
528 &cpu_idle_hltcnt, 0, "Idle loop entry halts");
529SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_spincnt, CTLFLAG_RW,
530 &cpu_idle_spincnt, 0, "Idle loop entry spins");
531
532void
533cpu_idle(void)
534{
535 struct thread *td = curthread;
536 struct mdglobaldata *gd = mdcpu;
c5724852 537 int reqflags;
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538
539 crit_exit();
f9235b6d 540 KKASSERT(td->td_critcount == 0);
da673940 541 cpu_enable_intr();
da0b0e8b 542
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543 for (;;) {
544 /*
545 * See if there are any LWKTs ready to go.
546 */
547 lwkt_switch();
548
549 /*
550 * The idle loop halts only if no threads are scheduleable
b12defdc 551 * and no signals have occured.
da673940 552 */
cbdd23b1
MD
553 if (cpu_idle_hlt &&
554 (td->td_gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
da673940 555 splz();
cbdd23b1 556 if ((td->td_gd->gd_reqflags & RQF_IDLECHECK_WK_MASK) == 0) {
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557#ifdef DEBUGIDLE
558 struct timeval tv1, tv2;
559 gettimeofday(&tv1, NULL);
560#endif
c5724852 561 reqflags = gd->mi.gd_reqflags &
cbdd23b1 562 ~RQF_IDLECHECK_WK_MASK;
da0b0e8b 563 KKASSERT(gd->mi.gd_processing_ipiq == 0);
c5724852
MD
564 umtx_sleep(&gd->mi.gd_reqflags, reqflags,
565 1000000);
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566#ifdef DEBUGIDLE
567 gettimeofday(&tv2, NULL);
568 if (tv2.tv_usec - tv1.tv_usec +
569 (tv2.tv_sec - tv1.tv_sec) * 1000000
570 > 500000) {
571 kprintf("cpu %d idlelock %08x %08x\n",
572 gd->mi.gd_cpuid,
f9235b6d 573 gd->mi.gd_reqflags,
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574 gd->gd_fpending);
575 }
576#endif
577 }
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578 ++cpu_idle_hltcnt;
579 } else {
da673940 580 splz();
da673940 581 __asm __volatile("pause");
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582 ++cpu_idle_spincnt;
583 }
584 }
585}
586
da673940 587/*
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588 * Called by the spinlock code with or without a critical section held
589 * when a spinlock is found to be seriously constested.
590 *
591 * We need to enter a critical section to prevent signals from recursing
592 * into pthreads.
593 */
594void
595cpu_spinlock_contested(void)
596{
b68e846f 597 cpu_pause();
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598}
599
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600/*
601 * Clear registers on exec
602 */
603void
604exec_setregs(u_long entry, u_long stack, u_long ps_strings)
605{
606 struct thread *td = curthread;
607 struct lwp *lp = td->td_lwp;
608 struct pcb *pcb = td->td_pcb;
609 struct trapframe *regs = lp->lwp_md.md_regs;
610
611 /* was i386_user_cleanup() in NetBSD */
612 user_ldt_free(pcb);
613
614 bzero((char *)regs, sizeof(struct trapframe));
615 regs->tf_rip = entry;
616 regs->tf_rsp = ((stack - 8) & ~0xFul) + 8; /* align the stack */
617 regs->tf_rdi = stack; /* argv */
618 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
619 regs->tf_ss = _udatasel;
620 regs->tf_cs = _ucodesel;
621 regs->tf_rbx = ps_strings;
622
623 /*
624 * Reset the hardware debug registers if they were in use.
625 * They won't have any meaning for the newly exec'd process.
626 */
627 if (pcb->pcb_flags & PCB_DBREGS) {
628 pcb->pcb_dr0 = 0;
629 pcb->pcb_dr1 = 0;
630 pcb->pcb_dr2 = 0;
631 pcb->pcb_dr3 = 0;
632 pcb->pcb_dr6 = 0;
633 pcb->pcb_dr7 = 0; /* JG set bit 10? */
634 if (pcb == td->td_pcb) {
635 /*
636 * Clear the debug registers on the running
637 * CPU, otherwise they will end up affecting
638 * the next process we switch to.
639 */
640 reset_dbregs();
641 }
642 pcb->pcb_flags &= ~PCB_DBREGS;
643 }
644
645 /*
646 * Initialize the math emulator (if any) for the current process.
647 * Actually, just clear the bit that says that the emulator has
648 * been initialized. Initialization is delayed until the process
649 * traps to the emulator (if it is done at all) mainly because
650 * emulators don't provide an entry point for initialization.
651 */
652 pcb->pcb_flags &= ~FP_SOFTFP;
653
654 /*
655 * NOTE: do not set CR0_TS here. npxinit() must do it after clearing
656 * gd_npxthread. Otherwise a preemptive interrupt thread
657 * may panic in npxdna().
658 */
659 crit_enter();
660#if 0
661 load_cr0(rcr0() | CR0_MP);
662#endif
663
664 /*
665 * NOTE: The MSR values must be correct so we can return to
666 * userland. gd_user_fs/gs must be correct so the switch
667 * code knows what the current MSR values are.
668 */
669 pcb->pcb_fsbase = 0; /* Values loaded from PCB on switch */
670 pcb->pcb_gsbase = 0;
671 /* Initialize the npx (if any) for the current process. */
a8f1df17 672 npxinit(__INITIAL_FPUCW__);
da673940
JG
673 crit_exit();
674
675 /*
676 * note: linux emulator needs edx to be 0x0 on entry, which is
677 * handled in execve simply by setting the 64 bit syscall
678 * return value to 0.
679 */
680}
681
682void
683cpu_setregs(void)
684{
685#if 0
686 unsigned int cr0;
687
688 cr0 = rcr0();
689 cr0 |= CR0_NE; /* Done by npxinit() */
690 cr0 |= CR0_MP | CR0_TS; /* Done at every execve() too. */
691 cr0 |= CR0_WP | CR0_AM;
692 load_cr0(cr0);
693 load_gs(_udatasel);
694#endif
695}
696
697static int
698sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
699{
700 int error;
701 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2,
702 req);
703 if (!error && req->newptr)
704 resettodr();
705 return (error);
706}
707
708SYSCTL_PROC(_machdep, CPU_ADJKERNTZ, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
709 &adjkerntz, 0, sysctl_machdep_adjkerntz, "I", "");
710
711extern u_long bootdev; /* not a cdev_t - encoding is different */
712SYSCTL_ULONG(_machdep, OID_AUTO, guessed_bootdev,
713 CTLFLAG_RD, &bootdev, 0, "Boot device (not in cdev_t format)");
714
715/*
716 * Initialize 386 and configure to run kernel
717 */
718
719/*
720 * Initialize segments & interrupt table
721 */
722
723extern struct user *proc0paddr;
724
725#if 0
726
727extern inthand_t
728 IDTVEC(div), IDTVEC(dbg), IDTVEC(nmi), IDTVEC(bpt), IDTVEC(ofl),
729 IDTVEC(bnd), IDTVEC(ill), IDTVEC(dna), IDTVEC(fpusegm),
730 IDTVEC(tss), IDTVEC(missing), IDTVEC(stk), IDTVEC(prot),
731 IDTVEC(page), IDTVEC(mchk), IDTVEC(rsvd), IDTVEC(fpu), IDTVEC(align),
732 IDTVEC(xmm), IDTVEC(dblfault),
733 IDTVEC(fast_syscall), IDTVEC(fast_syscall32);
734#endif
735
736#ifdef DEBUG_INTERRUPTS
737extern inthand_t *Xrsvdary[256];
738#endif
739
740int
741ptrace_set_pc(struct lwp *lp, unsigned long addr)
742{
743 lp->lwp_md.md_regs->tf_rip = addr;
744 return (0);
745}
746
747int
748ptrace_single_step(struct lwp *lp)
749{
750 lp->lwp_md.md_regs->tf_rflags |= PSL_T;
751 return (0);
752}
753
754int
755fill_regs(struct lwp *lp, struct reg *regs)
756{
da673940
JG
757 struct trapframe *tp;
758
d64d3805
MD
759 if ((tp = lp->lwp_md.md_regs) == NULL)
760 return EINVAL;
da673940 761 bcopy(&tp->tf_rdi, &regs->r_rdi, sizeof(*regs));
da673940
JG
762 return (0);
763}
764
765int
766set_regs(struct lwp *lp, struct reg *regs)
767{
da673940
JG
768 struct trapframe *tp;
769
770 tp = lp->lwp_md.md_regs;
771 if (!EFL_SECURE(regs->r_rflags, tp->tf_rflags) ||
772 !CS_SECURE(regs->r_cs))
773 return (EINVAL);
774 bcopy(&regs->r_rdi, &tp->tf_rdi, sizeof(*regs));
da673940
JG
775 return (0);
776}
777
778#ifndef CPU_DISABLE_SSE
779static void
780fill_fpregs_xmm(struct savexmm *sv_xmm, struct save87 *sv_87)
781{
782 struct env87 *penv_87 = &sv_87->sv_env;
783 struct envxmm *penv_xmm = &sv_xmm->sv_env;
784 int i;
785
786 /* FPU control/status */
787 penv_87->en_cw = penv_xmm->en_cw;
788 penv_87->en_sw = penv_xmm->en_sw;
789 penv_87->en_tw = penv_xmm->en_tw;
790 penv_87->en_fip = penv_xmm->en_fip;
791 penv_87->en_fcs = penv_xmm->en_fcs;
792 penv_87->en_opcode = penv_xmm->en_opcode;
793 penv_87->en_foo = penv_xmm->en_foo;
794 penv_87->en_fos = penv_xmm->en_fos;
795
796 /* FPU registers */
797 for (i = 0; i < 8; ++i)
798 sv_87->sv_ac[i] = sv_xmm->sv_fp[i].fp_acc;
da673940
JG
799}
800
801static void
802set_fpregs_xmm(struct save87 *sv_87, struct savexmm *sv_xmm)
803{
804 struct env87 *penv_87 = &sv_87->sv_env;
805 struct envxmm *penv_xmm = &sv_xmm->sv_env;
806 int i;
807
808 /* FPU control/status */
809 penv_xmm->en_cw = penv_87->en_cw;
810 penv_xmm->en_sw = penv_87->en_sw;
811 penv_xmm->en_tw = penv_87->en_tw;
812 penv_xmm->en_fip = penv_87->en_fip;
813 penv_xmm->en_fcs = penv_87->en_fcs;
814 penv_xmm->en_opcode = penv_87->en_opcode;
815 penv_xmm->en_foo = penv_87->en_foo;
816 penv_xmm->en_fos = penv_87->en_fos;
817
818 /* FPU registers */
819 for (i = 0; i < 8; ++i)
820 sv_xmm->sv_fp[i].fp_acc = sv_87->sv_ac[i];
da673940
JG
821}
822#endif /* CPU_DISABLE_SSE */
823
824int
825fill_fpregs(struct lwp *lp, struct fpreg *fpregs)
826{
d64d3805
MD
827 if (lp->lwp_thread == NULL || lp->lwp_thread->td_pcb == NULL)
828 return EINVAL;
da673940
JG
829#ifndef CPU_DISABLE_SSE
830 if (cpu_fxsr) {
831 fill_fpregs_xmm(&lp->lwp_thread->td_pcb->pcb_save.sv_xmm,
832 (struct save87 *)fpregs);
833 return (0);
834 }
835#endif /* CPU_DISABLE_SSE */
836 bcopy(&lp->lwp_thread->td_pcb->pcb_save.sv_87, fpregs, sizeof *fpregs);
837 return (0);
838}
839
840int
841set_fpregs(struct lwp *lp, struct fpreg *fpregs)
842{
843#ifndef CPU_DISABLE_SSE
844 if (cpu_fxsr) {
845 set_fpregs_xmm((struct save87 *)fpregs,
846 &lp->lwp_thread->td_pcb->pcb_save.sv_xmm);
847 return (0);
848 }
849#endif /* CPU_DISABLE_SSE */
850 bcopy(fpregs, &lp->lwp_thread->td_pcb->pcb_save.sv_87, sizeof *fpregs);
851 return (0);
852}
853
854int
855fill_dbregs(struct lwp *lp, struct dbreg *dbregs)
856{
857 return (ENOSYS);
858}
859
860int
861set_dbregs(struct lwp *lp, struct dbreg *dbregs)
862{
863 return (ENOSYS);
864}
865
866#if 0
867/*
868 * Return > 0 if a hardware breakpoint has been hit, and the
869 * breakpoint was in user space. Return 0, otherwise.
870 */
871int
872user_dbreg_trap(void)
873{
874 u_int32_t dr7, dr6; /* debug registers dr6 and dr7 */
875 u_int32_t bp; /* breakpoint bits extracted from dr6 */
876 int nbp; /* number of breakpoints that triggered */
877 caddr_t addr[4]; /* breakpoint addresses */
878 int i;
879
880 dr7 = rdr7();
881 if ((dr7 & 0x000000ff) == 0) {
882 /*
883 * all GE and LE bits in the dr7 register are zero,
884 * thus the trap couldn't have been caused by the
885 * hardware debug registers
886 */
887 return 0;
888 }
889
890 nbp = 0;
891 dr6 = rdr6();
892 bp = dr6 & 0x0000000f;
893
894 if (!bp) {
895 /*
896 * None of the breakpoint bits are set meaning this
897 * trap was not caused by any of the debug registers
898 */
899 return 0;
900 }
901
902 /*
903 * at least one of the breakpoints were hit, check to see
904 * which ones and if any of them are user space addresses
905 */
906
907 if (bp & 0x01) {
908 addr[nbp++] = (caddr_t)rdr0();
909 }
910 if (bp & 0x02) {
911 addr[nbp++] = (caddr_t)rdr1();
912 }
913 if (bp & 0x04) {
914 addr[nbp++] = (caddr_t)rdr2();
915 }
916 if (bp & 0x08) {
917 addr[nbp++] = (caddr_t)rdr3();
918 }
919
920 for (i=0; i<nbp; i++) {
921 if (addr[i] <
922 (caddr_t)VM_MAX_USER_ADDRESS) {
923 /*
924 * addr[i] is in user space
925 */
926 return nbp;
927 }
928 }
929
930 /*
931 * None of the breakpoints are in user space.
932 */
933 return 0;
934}
935
936#endif
937
938void
939identcpu(void)
940{
941 int regs[4];
942
943 do_cpuid(1, regs);
944 cpu_feature = regs[3];
945}
946
947
948#ifndef DDB
949void
950Debugger(const char *msg)
951{
952 kprintf("Debugger(\"%s\") called.\n", msg);
953}
954#endif /* no DDB */