2 * Copyright (c) 2003 Peter Wemm
3 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_compat.h"
39 #include <sys/param.h>
41 #include <sys/fcntl.h>
42 #include <sys/imgact.h>
43 #include <sys/kernel.h>
45 #include <sys/malloc.h>
46 #include <sys/mutex.h>
48 #include <sys/namei.h>
49 #include <sys/pioctl.h>
51 #include <sys/procfs.h>
52 #include <sys/resourcevar.h>
53 #include <sys/systm.h>
54 #include <sys/signalvar.h>
57 #include <sys/syscall.h>
58 #include <sys/sysctl.h>
59 #include <sys/sysent.h>
60 #include <sys/vnode.h>
63 #include <vm/vm_kern.h>
64 #include <vm/vm_param.h>
66 #include <vm/vm_map.h>
67 #include <vm/vm_object.h>
68 #include <vm/vm_extern.h>
70 #include <compat/freebsd32/freebsd32_signal.h>
71 #include <compat/freebsd32/freebsd32_util.h>
72 #include <compat/freebsd32/freebsd32_proto.h>
73 #include <compat/ia32/ia32_signal.h>
74 #include <machine/psl.h>
75 #include <machine/segments.h>
76 #include <machine/specialreg.h>
77 #include <machine/frame.h>
78 #include <machine/md_var.h>
79 #include <machine/pcb.h>
80 #include <machine/cpufunc.h>
82 #ifdef COMPAT_FREEBSD4
83 static void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
85 static void ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp);
86 static int ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp);
88 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
89 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
92 ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp)
96 * XXX Format of 64bit and 32bit FXSAVE areas differs. FXSAVE
97 * in 32bit mode saves %cs and %ds, while on 64bit it saves
98 * 64bit instruction and data pointers. Ignore the difference
99 * for now, it should be irrelevant for most applications.
101 mcp->mc_ownedfp = fpugetregs(td);
102 bcopy(&td->td_pcb->pcb_user_save, &mcp->mc_fpstate,
103 sizeof(mcp->mc_fpstate));
104 mcp->mc_fpformat = fpuformat();
108 ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp)
111 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
113 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
115 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
116 /* We don't care what state is left in the FPU or PCB. */
118 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
119 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
120 fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate);
127 * Get machine context.
130 ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
132 struct trapframe *tp;
136 PROC_LOCK(curthread->td_proc);
137 mcp->mc_onstack = sigonstack(tp->tf_rsp);
138 PROC_UNLOCK(curthread->td_proc);
139 /* Entry into kernel always sets TF_HASSEGS */
140 mcp->mc_gs = tp->tf_gs;
141 mcp->mc_fs = tp->tf_fs;
142 mcp->mc_es = tp->tf_es;
143 mcp->mc_ds = tp->tf_ds;
144 mcp->mc_edi = tp->tf_rdi;
145 mcp->mc_esi = tp->tf_rsi;
146 mcp->mc_ebp = tp->tf_rbp;
147 mcp->mc_isp = tp->tf_rsp;
148 mcp->mc_eflags = tp->tf_rflags;
149 if (flags & GET_MC_CLEAR_RET) {
152 mcp->mc_eflags &= ~PSL_C;
154 mcp->mc_eax = tp->tf_rax;
155 mcp->mc_edx = tp->tf_rdx;
157 mcp->mc_ebx = tp->tf_rbx;
158 mcp->mc_ecx = tp->tf_rcx;
159 mcp->mc_eip = tp->tf_rip;
160 mcp->mc_cs = tp->tf_cs;
161 mcp->mc_esp = tp->tf_rsp;
162 mcp->mc_ss = tp->tf_ss;
163 mcp->mc_len = sizeof(*mcp);
164 ia32_get_fpcontext(td, mcp);
165 mcp->mc_fsbase = td->td_pcb->pcb_fsbase;
166 mcp->mc_gsbase = td->td_pcb->pcb_gsbase;
167 td->td_pcb->pcb_full_iret = 1;
172 * Set machine context.
174 * However, we don't set any but the user modifiable flags, and we won't
175 * touch the cs selector.
178 ia32_set_mcontext(struct thread *td, const struct ia32_mcontext *mcp)
180 struct trapframe *tp;
185 if (mcp->mc_len != sizeof(*mcp))
187 rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
188 (tp->tf_rflags & ~PSL_USERCHANGE);
189 ret = ia32_set_fpcontext(td, mcp);
192 tp->tf_gs = mcp->mc_gs;
193 tp->tf_fs = mcp->mc_fs;
194 tp->tf_es = mcp->mc_es;
195 tp->tf_ds = mcp->mc_ds;
196 tp->tf_flags = TF_HASSEGS;
197 tp->tf_rdi = mcp->mc_edi;
198 tp->tf_rsi = mcp->mc_esi;
199 tp->tf_rbp = mcp->mc_ebp;
200 tp->tf_rbx = mcp->mc_ebx;
201 tp->tf_rdx = mcp->mc_edx;
202 tp->tf_rcx = mcp->mc_ecx;
203 tp->tf_rax = mcp->mc_eax;
205 tp->tf_rip = mcp->mc_eip;
206 tp->tf_rflags = rflags;
207 tp->tf_rsp = mcp->mc_esp;
208 tp->tf_ss = mcp->mc_ss;
209 td->td_pcb->pcb_full_iret = 1;
214 * The first two fields of a ucontext_t are the signal mask and
215 * the machine context. The next field is uc_link; we want to
216 * avoid destroying the link when copying out contexts.
218 #define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link)
221 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
223 struct ia32_ucontext uc;
226 if (uap->ucp == NULL)
229 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
230 PROC_LOCK(td->td_proc);
231 uc.uc_sigmask = td->td_sigmask;
232 PROC_UNLOCK(td->td_proc);
233 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
239 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
241 struct ia32_ucontext uc;
244 if (uap->ucp == NULL)
247 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
249 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
251 kern_sigprocmask(td, SIG_SETMASK,
252 &uc.uc_sigmask, NULL, 0);
256 return (ret == 0 ? EJUSTRETURN : ret);
260 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
262 struct ia32_ucontext uc;
265 if (uap->oucp == NULL || uap->ucp == NULL)
268 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
269 PROC_LOCK(td->td_proc);
270 uc.uc_sigmask = td->td_sigmask;
271 PROC_UNLOCK(td->td_proc);
272 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
274 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
276 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
278 kern_sigprocmask(td, SIG_SETMASK,
279 &uc.uc_sigmask, NULL, 0);
284 return (ret == 0 ? EJUSTRETURN : ret);
288 * Send an interrupt to process.
290 * Stack is set up to allow sigcode stored
291 * at top to call routine, followed by kcall
292 * to sigreturn routine below. After sigreturn
293 * resets the signal mask, the stack, and the
294 * frame pointer, it returns to the user
297 #ifdef COMPAT_FREEBSD4
299 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
301 struct ia32_sigframe4 sf, *sfp;
302 struct siginfo32 siginfo;
306 struct trapframe *regs;
312 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
314 PROC_LOCK_ASSERT(p, MA_OWNED);
315 sig = siginfo.si_signo;
317 mtx_assert(&psp->ps_mtx, MA_OWNED);
319 oonstack = sigonstack(regs->tf_rsp);
321 /* Save user context. */
322 bzero(&sf, sizeof(sf));
323 sf.sf_uc.uc_sigmask = *mask;
324 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
325 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
326 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
327 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
328 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
329 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
330 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
331 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
332 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
333 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
334 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
335 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
336 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
337 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
338 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
339 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
340 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
341 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
342 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
343 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
344 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
345 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
346 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
347 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
349 /* Allocate space for the signal handler context. */
350 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
351 SIGISMEMBER(psp->ps_sigonstack, sig)) {
352 sfp = (struct ia32_sigframe4 *)(td->td_sigstk.ss_sp +
353 td->td_sigstk.ss_size - sizeof(sf));
355 sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
358 /* Translate the signal if appropriate. */
359 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
360 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
362 /* Build the argument list for the signal handler. */
364 sf.sf_ucontext = (register_t)&sfp->sf_uc;
365 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
366 /* Signal handler installed with SA_SIGINFO. */
367 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
368 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
370 /* Fill in POSIX parts */
372 sf.sf_si.si_signo = sig;
374 /* Old FreeBSD-style arguments. */
375 sf.sf_siginfo = siginfo.si_code;
376 sf.sf_addr = (u_int32_t)siginfo.si_addr;
377 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
379 mtx_unlock(&psp->ps_mtx);
382 * Copy the sigframe out to the user's stack.
384 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
386 printf("process %ld has trashed its stack\n", (long)p->p_pid);
392 regs->tf_rsp = (uintptr_t)sfp;
393 regs->tf_rip = p->p_sysent->sv_psstrings - sz_freebsd4_ia32_sigcode;
394 regs->tf_rflags &= ~(PSL_T | PSL_D);
395 regs->tf_cs = _ucode32sel;
396 regs->tf_ss = _udatasel;
397 regs->tf_ds = _udatasel;
398 regs->tf_es = _udatasel;
399 td->td_pcb->pcb_full_iret = 1;
400 /* leave user %fs and %gs untouched */
402 mtx_lock(&psp->ps_mtx);
404 #endif /* COMPAT_FREEBSD4 */
407 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
409 struct ia32_sigframe sf, *sfp;
410 struct siginfo32 siginfo;
415 struct trapframe *regs;
419 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
422 PROC_LOCK_ASSERT(p, MA_OWNED);
423 sig = siginfo.si_signo;
425 #ifdef COMPAT_FREEBSD4
426 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
427 freebsd4_ia32_sendsig(catcher, ksi, mask);
431 mtx_assert(&psp->ps_mtx, MA_OWNED);
433 oonstack = sigonstack(regs->tf_rsp);
435 /* Save user context. */
436 bzero(&sf, sizeof(sf));
437 sf.sf_uc.uc_sigmask = *mask;
438 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
439 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
440 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
441 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
442 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
443 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
444 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
445 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
446 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
447 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
448 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
449 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
450 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
451 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
452 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
453 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
454 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
455 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
456 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
457 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
458 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
459 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
460 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
461 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
462 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
463 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext);
465 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
466 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
468 /* Allocate space for the signal handler context. */
469 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
470 SIGISMEMBER(psp->ps_sigonstack, sig)) {
471 sp = td->td_sigstk.ss_sp +
472 td->td_sigstk.ss_size - sizeof(sf);
474 sp = (char *)regs->tf_rsp - sizeof(sf);
475 /* Align to 16 bytes. */
476 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
479 /* Translate the signal if appropriate. */
480 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
481 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
483 /* Build the argument list for the signal handler. */
485 sf.sf_ucontext = (register_t)&sfp->sf_uc;
486 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
487 /* Signal handler installed with SA_SIGINFO. */
488 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
489 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
491 /* Fill in POSIX parts */
493 sf.sf_si.si_signo = sig;
495 /* Old FreeBSD-style arguments. */
496 sf.sf_siginfo = siginfo.si_code;
497 sf.sf_addr = (u_int32_t)siginfo.si_addr;
498 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
500 mtx_unlock(&psp->ps_mtx);
503 * Copy the sigframe out to the user's stack.
505 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
507 printf("process %ld has trashed its stack\n", (long)p->p_pid);
513 regs->tf_rsp = (uintptr_t)sfp;
514 regs->tf_rip = p->p_sysent->sv_psstrings - *(p->p_sysent->sv_szsigcode);
515 regs->tf_rflags &= ~(PSL_T | PSL_D);
516 regs->tf_cs = _ucode32sel;
517 regs->tf_ss = _udatasel;
518 regs->tf_ds = _udatasel;
519 regs->tf_es = _udatasel;
520 td->td_pcb->pcb_full_iret = 1;
521 /* XXXKIB leave user %fs and %gs untouched */
523 mtx_lock(&psp->ps_mtx);
527 * System call to cleanup state after a signal
528 * has been taken. Reset signal mask and
529 * stack state from context left by sendsig (above).
530 * Return to previous pc and psl as specified by
531 * context left by sendsig. Check carefully to
532 * make sure that the user has not modified the
533 * state to gain improper privileges.
535 #ifdef COMPAT_FREEBSD4
540 freebsd4_freebsd32_sigreturn(td, uap)
542 struct freebsd4_freebsd32_sigreturn_args /* {
543 const struct freebsd4_freebsd32_ucontext *sigcntxp;
546 struct ia32_ucontext4 uc;
547 struct trapframe *regs;
548 struct ia32_ucontext4 *ucp;
549 int cs, eflags, error;
552 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
557 eflags = ucp->uc_mcontext.mc_eflags;
559 * Don't allow users to change privileged or reserved flags.
562 * XXX do allow users to change the privileged flag PSL_RF.
563 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
564 * should sometimes set it there too. tf_eflags is kept in
565 * the signal context during signal handling and there is no
566 * other place to remember it, so the PSL_RF bit may be
567 * corrupted by the signal handler without us knowing.
568 * Corruption of the PSL_RF bit at worst causes one more or
569 * one less debugger trap, so allowing it is fairly harmless.
571 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
572 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
573 td->td_proc->p_pid, td->td_name, eflags);
578 * Don't allow users to load a valid privileged %cs. Let the
579 * hardware check for invalid selectors, excess privilege in
580 * other selectors, invalid %eip's and invalid %esp's.
582 cs = ucp->uc_mcontext.mc_cs;
583 if (!CS_SECURE(cs)) {
584 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
585 td->td_proc->p_pid, td->td_name, cs);
586 ksiginfo_init_trap(&ksi);
587 ksi.ksi_signo = SIGBUS;
588 ksi.ksi_code = BUS_OBJERR;
589 ksi.ksi_trapno = T_PROTFLT;
590 ksi.ksi_addr = (void *)regs->tf_rip;
591 trapsignal(td, &ksi);
595 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
596 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
597 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
598 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
599 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
600 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
601 regs->tf_rax = ucp->uc_mcontext.mc_eax;
602 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
603 regs->tf_err = ucp->uc_mcontext.mc_err;
604 regs->tf_rip = ucp->uc_mcontext.mc_eip;
606 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
607 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
608 regs->tf_ss = ucp->uc_mcontext.mc_ss;
609 regs->tf_ds = ucp->uc_mcontext.mc_ds;
610 regs->tf_es = ucp->uc_mcontext.mc_es;
611 regs->tf_fs = ucp->uc_mcontext.mc_fs;
612 regs->tf_gs = ucp->uc_mcontext.mc_gs;
614 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
615 td->td_pcb->pcb_full_iret = 1;
616 return (EJUSTRETURN);
618 #endif /* COMPAT_FREEBSD4 */
624 freebsd32_sigreturn(td, uap)
626 struct freebsd32_sigreturn_args /* {
627 const struct freebsd32_ucontext *sigcntxp;
630 struct ia32_ucontext uc;
631 struct trapframe *regs;
632 struct ia32_ucontext *ucp;
633 int cs, eflags, error, ret;
636 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
641 eflags = ucp->uc_mcontext.mc_eflags;
643 * Don't allow users to change privileged or reserved flags.
646 * XXX do allow users to change the privileged flag PSL_RF.
647 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
648 * should sometimes set it there too. tf_eflags is kept in
649 * the signal context during signal handling and there is no
650 * other place to remember it, so the PSL_RF bit may be
651 * corrupted by the signal handler without us knowing.
652 * Corruption of the PSL_RF bit at worst causes one more or
653 * one less debugger trap, so allowing it is fairly harmless.
655 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
656 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
657 td->td_proc->p_pid, td->td_name, eflags);
662 * Don't allow users to load a valid privileged %cs. Let the
663 * hardware check for invalid selectors, excess privilege in
664 * other selectors, invalid %eip's and invalid %esp's.
666 cs = ucp->uc_mcontext.mc_cs;
667 if (!CS_SECURE(cs)) {
668 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
669 td->td_proc->p_pid, td->td_name, cs);
670 ksiginfo_init_trap(&ksi);
671 ksi.ksi_signo = SIGBUS;
672 ksi.ksi_code = BUS_OBJERR;
673 ksi.ksi_trapno = T_PROTFLT;
674 ksi.ksi_addr = (void *)regs->tf_rip;
675 trapsignal(td, &ksi);
679 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext);
683 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
684 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
685 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
686 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
687 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
688 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
689 regs->tf_rax = ucp->uc_mcontext.mc_eax;
690 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
691 regs->tf_err = ucp->uc_mcontext.mc_err;
692 regs->tf_rip = ucp->uc_mcontext.mc_eip;
694 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
695 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
696 regs->tf_ss = ucp->uc_mcontext.mc_ss;
697 regs->tf_ds = ucp->uc_mcontext.mc_ds;
698 regs->tf_es = ucp->uc_mcontext.mc_es;
699 regs->tf_fs = ucp->uc_mcontext.mc_fs;
700 regs->tf_gs = ucp->uc_mcontext.mc_gs;
701 regs->tf_flags = TF_HASSEGS;
703 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
704 td->td_pcb->pcb_full_iret = 1;
705 return (EJUSTRETURN);
709 * Clear registers on exec
712 ia32_setregs(td, entry, stack, ps_strings)
718 struct trapframe *regs = td->td_frame;
719 struct pcb *pcb = td->td_pcb;
722 if (td->td_proc->p_md.md_ldt != NULL)
725 mtx_unlock(&dt_lock);
729 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
731 bzero((char *)regs, sizeof(struct trapframe));
732 regs->tf_rip = entry;
733 regs->tf_rsp = stack;
734 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
735 regs->tf_ss = _udatasel;
736 regs->tf_cs = _ucode32sel;
737 regs->tf_rbx = ps_strings;
738 regs->tf_ds = _udatasel;
739 regs->tf_es = _udatasel;
740 regs->tf_fs = _ufssel;
741 regs->tf_gs = _ugssel;
742 regs->tf_flags = TF_HASSEGS;
744 load_cr0(rcr0() | CR0_MP | CR0_TS);
747 /* Return via doreti so that we can change to a different %cs */
748 pcb->pcb_flags |= PCB_32BIT;
749 pcb->pcb_flags &= ~PCB_GS32BIT;
750 td->td_pcb->pcb_full_iret = 1;
751 td->td_retval[1] = 0;