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)
95 mcp->mc_ownedfp = fpugetregs(td, (struct savefpu *)&mcp->mc_fpstate);
96 mcp->mc_fpformat = fpuformat();
100 ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp)
103 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
105 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
107 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
108 /* We don't care what state is left in the FPU or PCB. */
110 else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
111 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
113 * XXX we violate the dubious requirement that fpusetregs()
114 * be called with interrupts disabled.
116 fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate);
123 * Get machine context.
126 ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
128 struct trapframe *tp;
132 PROC_LOCK(curthread->td_proc);
133 mcp->mc_onstack = sigonstack(tp->tf_rsp);
134 PROC_UNLOCK(curthread->td_proc);
135 /* Entry into kernel always sets TF_HASSEGS */
136 mcp->mc_gs = tp->tf_gs;
137 mcp->mc_fs = tp->tf_fs;
138 mcp->mc_es = tp->tf_es;
139 mcp->mc_ds = tp->tf_ds;
140 mcp->mc_edi = tp->tf_rdi;
141 mcp->mc_esi = tp->tf_rsi;
142 mcp->mc_ebp = tp->tf_rbp;
143 mcp->mc_isp = tp->tf_rsp;
144 mcp->mc_eflags = tp->tf_rflags;
145 if (flags & GET_MC_CLEAR_RET) {
148 mcp->mc_eflags &= ~PSL_C;
150 mcp->mc_eax = tp->tf_rax;
151 mcp->mc_edx = tp->tf_rdx;
153 mcp->mc_ebx = tp->tf_rbx;
154 mcp->mc_ecx = tp->tf_rcx;
155 mcp->mc_eip = tp->tf_rip;
156 mcp->mc_cs = tp->tf_cs;
157 mcp->mc_esp = tp->tf_rsp;
158 mcp->mc_ss = tp->tf_ss;
159 mcp->mc_len = sizeof(*mcp);
160 ia32_get_fpcontext(td, mcp);
161 mcp->mc_fsbase = td->td_pcb->pcb_fsbase;
162 mcp->mc_gsbase = td->td_pcb->pcb_gsbase;
163 td->td_pcb->pcb_full_iret = 1;
168 * Set machine context.
170 * However, we don't set any but the user modifiable flags, and we won't
171 * touch the cs selector.
174 ia32_set_mcontext(struct thread *td, const struct ia32_mcontext *mcp)
176 struct trapframe *tp;
181 if (mcp->mc_len != sizeof(*mcp))
183 rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
184 (tp->tf_rflags & ~PSL_USERCHANGE);
185 ret = ia32_set_fpcontext(td, mcp);
188 tp->tf_gs = mcp->mc_gs;
189 tp->tf_fs = mcp->mc_fs;
190 tp->tf_es = mcp->mc_es;
191 tp->tf_ds = mcp->mc_ds;
192 tp->tf_flags = TF_HASSEGS;
193 tp->tf_rdi = mcp->mc_edi;
194 tp->tf_rsi = mcp->mc_esi;
195 tp->tf_rbp = mcp->mc_ebp;
196 tp->tf_rbx = mcp->mc_ebx;
197 tp->tf_rdx = mcp->mc_edx;
198 tp->tf_rcx = mcp->mc_ecx;
199 tp->tf_rax = mcp->mc_eax;
201 tp->tf_rip = mcp->mc_eip;
202 tp->tf_rflags = rflags;
203 tp->tf_rsp = mcp->mc_esp;
204 tp->tf_ss = mcp->mc_ss;
205 td->td_pcb->pcb_flags |= PCB_FULLCTX;
206 td->td_pcb->pcb_full_iret = 1;
211 * The first two fields of a ucontext_t are the signal mask and
212 * the machine context. The next field is uc_link; we want to
213 * avoid destroying the link when copying out contexts.
215 #define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link)
218 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
220 struct ia32_ucontext uc;
223 if (uap->ucp == NULL)
226 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
227 PROC_LOCK(td->td_proc);
228 uc.uc_sigmask = td->td_sigmask;
229 PROC_UNLOCK(td->td_proc);
230 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
236 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
238 struct ia32_ucontext uc;
241 if (uap->ucp == NULL)
244 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
246 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
248 kern_sigprocmask(td, SIG_SETMASK,
249 &uc.uc_sigmask, NULL, 0);
253 return (ret == 0 ? EJUSTRETURN : ret);
257 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
259 struct ia32_ucontext uc;
262 if (uap->oucp == NULL || uap->ucp == NULL)
265 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
266 PROC_LOCK(td->td_proc);
267 uc.uc_sigmask = td->td_sigmask;
268 PROC_UNLOCK(td->td_proc);
269 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
271 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
273 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
275 kern_sigprocmask(td, SIG_SETMASK,
276 &uc.uc_sigmask, NULL, 0);
281 return (ret == 0 ? EJUSTRETURN : ret);
285 * Send an interrupt to process.
287 * Stack is set up to allow sigcode stored
288 * at top to call routine, followed by kcall
289 * to sigreturn routine below. After sigreturn
290 * resets the signal mask, the stack, and the
291 * frame pointer, it returns to the user
294 #ifdef COMPAT_FREEBSD4
296 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
298 struct ia32_sigframe4 sf, *sfp;
299 struct siginfo32 siginfo;
303 struct trapframe *regs;
309 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
311 PROC_LOCK_ASSERT(p, MA_OWNED);
312 sig = siginfo.si_signo;
314 mtx_assert(&psp->ps_mtx, MA_OWNED);
316 oonstack = sigonstack(regs->tf_rsp);
318 /* Save user context. */
319 bzero(&sf, sizeof(sf));
320 sf.sf_uc.uc_sigmask = *mask;
321 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
322 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
323 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
324 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
325 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
326 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
327 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
328 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
329 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
330 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
331 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
332 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
333 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
334 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
335 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
336 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
337 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
338 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
339 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
340 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
341 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
342 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
343 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
344 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
346 /* Allocate space for the signal handler context. */
347 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
348 SIGISMEMBER(psp->ps_sigonstack, sig)) {
349 sfp = (struct ia32_sigframe4 *)(td->td_sigstk.ss_sp +
350 td->td_sigstk.ss_size - sizeof(sf));
352 sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
355 /* Translate the signal if appropriate. */
356 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
357 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
359 /* Build the argument list for the signal handler. */
361 sf.sf_ucontext = (register_t)&sfp->sf_uc;
362 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
363 /* Signal handler installed with SA_SIGINFO. */
364 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
365 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
367 /* Fill in POSIX parts */
369 sf.sf_si.si_signo = sig;
371 /* Old FreeBSD-style arguments. */
372 sf.sf_siginfo = siginfo.si_code;
373 sf.sf_addr = (u_int32_t)siginfo.si_addr;
374 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
376 mtx_unlock(&psp->ps_mtx);
379 * Copy the sigframe out to the user's stack.
381 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
383 printf("process %ld has trashed its stack\n", (long)p->p_pid);
389 regs->tf_rsp = (uintptr_t)sfp;
390 regs->tf_rip = FREEBSD32_PS_STRINGS - sz_freebsd4_ia32_sigcode;
391 regs->tf_rflags &= ~(PSL_T | PSL_D);
392 regs->tf_cs = _ucode32sel;
393 regs->tf_ss = _udatasel;
394 regs->tf_ds = _udatasel;
395 regs->tf_es = _udatasel;
396 td->td_pcb->pcb_full_iret = 1;
397 /* leave user %fs and %gs untouched */
399 mtx_lock(&psp->ps_mtx);
401 #endif /* COMPAT_FREEBSD4 */
404 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
406 struct ia32_sigframe sf, *sfp;
407 struct siginfo32 siginfo;
412 struct trapframe *regs;
416 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
419 PROC_LOCK_ASSERT(p, MA_OWNED);
420 sig = siginfo.si_signo;
422 #ifdef COMPAT_FREEBSD4
423 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
424 freebsd4_ia32_sendsig(catcher, ksi, mask);
428 mtx_assert(&psp->ps_mtx, MA_OWNED);
430 oonstack = sigonstack(regs->tf_rsp);
432 /* Save user context. */
433 bzero(&sf, sizeof(sf));
434 sf.sf_uc.uc_sigmask = *mask;
435 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
436 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
437 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
438 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
439 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
440 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
441 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
442 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
443 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
444 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
445 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
446 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
447 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
448 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
449 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
450 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
451 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
452 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
453 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
454 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
455 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
456 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
457 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
458 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
459 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
460 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext);
462 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
463 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
465 /* Allocate space for the signal handler context. */
466 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
467 SIGISMEMBER(psp->ps_sigonstack, sig)) {
468 sp = td->td_sigstk.ss_sp +
469 td->td_sigstk.ss_size - sizeof(sf);
471 sp = (char *)regs->tf_rsp - sizeof(sf);
472 /* Align to 16 bytes. */
473 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
476 /* Translate the signal if appropriate. */
477 if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
478 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
480 /* Build the argument list for the signal handler. */
482 sf.sf_ucontext = (register_t)&sfp->sf_uc;
483 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
484 /* Signal handler installed with SA_SIGINFO. */
485 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
486 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
488 /* Fill in POSIX parts */
490 sf.sf_si.si_signo = sig;
492 /* Old FreeBSD-style arguments. */
493 sf.sf_siginfo = siginfo.si_code;
494 sf.sf_addr = (u_int32_t)siginfo.si_addr;
495 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
497 mtx_unlock(&psp->ps_mtx);
500 * Copy the sigframe out to the user's stack.
502 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
504 printf("process %ld has trashed its stack\n", (long)p->p_pid);
510 regs->tf_rsp = (uintptr_t)sfp;
511 regs->tf_rip = FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
512 regs->tf_rflags &= ~(PSL_T | PSL_D);
513 regs->tf_cs = _ucode32sel;
514 regs->tf_ss = _udatasel;
515 regs->tf_ds = _udatasel;
516 regs->tf_es = _udatasel;
517 td->td_pcb->pcb_full_iret = 1;
518 /* XXXKIB leave user %fs and %gs untouched */
520 mtx_lock(&psp->ps_mtx);
524 * System call to cleanup state after a signal
525 * has been taken. Reset signal mask and
526 * stack state from context left by sendsig (above).
527 * Return to previous pc and psl as specified by
528 * context left by sendsig. Check carefully to
529 * make sure that the user has not modified the
530 * state to gain improper privileges.
532 #ifdef COMPAT_FREEBSD4
537 freebsd4_freebsd32_sigreturn(td, uap)
539 struct freebsd4_freebsd32_sigreturn_args /* {
540 const struct freebsd4_freebsd32_ucontext *sigcntxp;
543 struct ia32_ucontext4 uc;
544 struct trapframe *regs;
545 struct ia32_ucontext4 *ucp;
546 int cs, eflags, error;
549 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
554 eflags = ucp->uc_mcontext.mc_eflags;
556 * Don't allow users to change privileged or reserved flags.
559 * XXX do allow users to change the privileged flag PSL_RF.
560 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
561 * should sometimes set it there too. tf_eflags is kept in
562 * the signal context during signal handling and there is no
563 * other place to remember it, so the PSL_RF bit may be
564 * corrupted by the signal handler without us knowing.
565 * Corruption of the PSL_RF bit at worst causes one more or
566 * one less debugger trap, so allowing it is fairly harmless.
568 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
569 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
570 td->td_proc->p_pid, td->td_name, eflags);
575 * Don't allow users to load a valid privileged %cs. Let the
576 * hardware check for invalid selectors, excess privilege in
577 * other selectors, invalid %eip's and invalid %esp's.
579 cs = ucp->uc_mcontext.mc_cs;
580 if (!CS_SECURE(cs)) {
581 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
582 td->td_proc->p_pid, td->td_name, cs);
583 ksiginfo_init_trap(&ksi);
584 ksi.ksi_signo = SIGBUS;
585 ksi.ksi_code = BUS_OBJERR;
586 ksi.ksi_trapno = T_PROTFLT;
587 ksi.ksi_addr = (void *)regs->tf_rip;
588 trapsignal(td, &ksi);
592 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
593 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
594 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
595 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
596 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
597 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
598 regs->tf_rax = ucp->uc_mcontext.mc_eax;
599 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
600 regs->tf_err = ucp->uc_mcontext.mc_err;
601 regs->tf_rip = ucp->uc_mcontext.mc_eip;
603 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
604 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
605 regs->tf_ss = ucp->uc_mcontext.mc_ss;
606 regs->tf_ds = ucp->uc_mcontext.mc_ds;
607 regs->tf_es = ucp->uc_mcontext.mc_es;
608 regs->tf_fs = ucp->uc_mcontext.mc_fs;
609 regs->tf_gs = ucp->uc_mcontext.mc_gs;
611 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
612 td->td_pcb->pcb_full_iret = 1;
613 return (EJUSTRETURN);
615 #endif /* COMPAT_FREEBSD4 */
621 freebsd32_sigreturn(td, uap)
623 struct freebsd32_sigreturn_args /* {
624 const struct freebsd32_ucontext *sigcntxp;
627 struct ia32_ucontext uc;
628 struct trapframe *regs;
629 struct ia32_ucontext *ucp;
630 int cs, eflags, error, ret;
633 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
638 eflags = ucp->uc_mcontext.mc_eflags;
640 * Don't allow users to change privileged or reserved flags.
643 * XXX do allow users to change the privileged flag PSL_RF.
644 * The cpu sets PSL_RF in tf_eflags for faults. Debuggers
645 * should sometimes set it there too. tf_eflags is kept in
646 * the signal context during signal handling and there is no
647 * other place to remember it, so the PSL_RF bit may be
648 * corrupted by the signal handler without us knowing.
649 * Corruption of the PSL_RF bit at worst causes one more or
650 * one less debugger trap, so allowing it is fairly harmless.
652 if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
653 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
654 td->td_proc->p_pid, td->td_name, eflags);
659 * Don't allow users to load a valid privileged %cs. Let the
660 * hardware check for invalid selectors, excess privilege in
661 * other selectors, invalid %eip's and invalid %esp's.
663 cs = ucp->uc_mcontext.mc_cs;
664 if (!CS_SECURE(cs)) {
665 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
666 td->td_proc->p_pid, td->td_name, cs);
667 ksiginfo_init_trap(&ksi);
668 ksi.ksi_signo = SIGBUS;
669 ksi.ksi_code = BUS_OBJERR;
670 ksi.ksi_trapno = T_PROTFLT;
671 ksi.ksi_addr = (void *)regs->tf_rip;
672 trapsignal(td, &ksi);
676 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext);
680 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
681 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
682 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
683 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
684 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
685 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
686 regs->tf_rax = ucp->uc_mcontext.mc_eax;
687 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
688 regs->tf_err = ucp->uc_mcontext.mc_err;
689 regs->tf_rip = ucp->uc_mcontext.mc_eip;
691 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
692 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
693 regs->tf_ss = ucp->uc_mcontext.mc_ss;
694 regs->tf_ds = ucp->uc_mcontext.mc_ds;
695 regs->tf_es = ucp->uc_mcontext.mc_es;
696 regs->tf_fs = ucp->uc_mcontext.mc_fs;
697 regs->tf_gs = ucp->uc_mcontext.mc_gs;
698 regs->tf_flags = TF_HASSEGS;
700 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
701 td->td_pcb->pcb_full_iret = 1;
702 return (EJUSTRETURN);
706 * Clear registers on exec
709 ia32_setregs(td, entry, stack, ps_strings)
715 struct trapframe *regs = td->td_frame;
716 struct pcb *pcb = td->td_pcb;
719 if (td->td_proc->p_md.md_ldt != NULL)
722 mtx_unlock(&dt_lock);
726 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
728 bzero((char *)regs, sizeof(struct trapframe));
729 regs->tf_rip = entry;
730 regs->tf_rsp = stack;
731 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
732 regs->tf_ss = _udatasel;
733 regs->tf_cs = _ucode32sel;
734 regs->tf_rbx = ps_strings;
735 regs->tf_ds = _udatasel;
736 regs->tf_es = _udatasel;
737 regs->tf_fs = _ufssel;
738 regs->tf_gs = _ugssel;
739 regs->tf_flags = TF_HASSEGS;
741 load_cr0(rcr0() | CR0_MP | CR0_TS);
744 /* Return via doreti so that we can change to a different %cs */
745 pcb->pcb_flags |= PCB_FULLCTX | PCB_32BIT;
746 pcb->pcb_flags &= ~PCB_GS32BIT;
747 td->td_pcb->pcb_full_iret = 1;
748 td->td_retval[1] = 0;