2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2003 Peter Wemm
5 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
8 * This code is derived from software contributed to Berkeley by
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
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/syscallsubr.h>
59 #include <sys/sysctl.h>
60 #include <sys/sysent.h>
61 #include <sys/vnode.h>
64 #include <vm/vm_kern.h>
65 #include <vm/vm_param.h>
67 #include <vm/vm_map.h>
68 #include <vm/vm_object.h>
69 #include <vm/vm_extern.h>
71 #include <compat/freebsd32/freebsd32_signal.h>
72 #include <compat/freebsd32/freebsd32_util.h>
73 #include <compat/freebsd32/freebsd32_proto.h>
74 #include <compat/freebsd32/freebsd32.h>
75 #include <compat/ia32/ia32_signal.h>
76 #include <machine/psl.h>
77 #include <machine/segments.h>
78 #include <machine/specialreg.h>
79 #include <machine/frame.h>
80 #include <machine/md_var.h>
81 #include <machine/pcb.h>
82 #include <machine/cpufunc.h>
83 #include <machine/trap.h>
85 #ifdef COMPAT_FREEBSD4
86 static void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
89 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
90 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
93 ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
94 char *xfpusave, size_t xfpusave_len)
99 * XXX Format of 64bit and 32bit FXSAVE areas differs. FXSAVE
100 * in 32bit mode saves %cs and %ds, while on 64bit it saves
101 * 64bit instruction and data pointers. Ignore the difference
102 * for now, it should be irrelevant for most applications.
104 mcp->mc_ownedfp = fpugetregs(td);
105 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
106 sizeof(mcp->mc_fpstate));
107 mcp->mc_fpformat = fpuformat();
108 if (!use_xsave || xfpusave_len == 0)
110 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
114 bzero(xfpusave + max_len, len - max_len);
116 mcp->mc_flags |= _MC_IA32_HASFPXSTATE;
117 mcp->mc_xfpustate_len = len;
118 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
122 ia32_set_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
123 char *xfpustate, size_t xfpustate_len)
127 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
129 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
131 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
132 /* We don't care what state is left in the FPU or PCB. */
135 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
136 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
137 error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate,
138 xfpustate, xfpustate_len);
145 * Get machine context.
148 ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
151 struct trapframe *tp;
156 PROC_LOCK(curthread->td_proc);
157 mcp->mc_onstack = sigonstack(tp->tf_rsp);
158 PROC_UNLOCK(curthread->td_proc);
159 /* Entry into kernel always sets TF_HASSEGS */
160 mcp->mc_gs = tp->tf_gs;
161 mcp->mc_fs = tp->tf_fs;
162 mcp->mc_es = tp->tf_es;
163 mcp->mc_ds = tp->tf_ds;
164 mcp->mc_edi = tp->tf_rdi;
165 mcp->mc_esi = tp->tf_rsi;
166 mcp->mc_ebp = tp->tf_rbp;
167 mcp->mc_isp = tp->tf_rsp;
168 mcp->mc_eflags = tp->tf_rflags;
169 if (flags & GET_MC_CLEAR_RET) {
172 mcp->mc_eflags &= ~PSL_C;
174 mcp->mc_eax = tp->tf_rax;
175 mcp->mc_edx = tp->tf_rdx;
177 mcp->mc_ebx = tp->tf_rbx;
178 mcp->mc_ecx = tp->tf_rcx;
179 mcp->mc_eip = tp->tf_rip;
180 mcp->mc_cs = tp->tf_cs;
181 mcp->mc_esp = tp->tf_rsp;
182 mcp->mc_ss = tp->tf_ss;
183 mcp->mc_len = sizeof(*mcp);
184 mcp->mc_flags = tp->tf_flags;
185 ia32_get_fpcontext(td, mcp, NULL, 0);
186 mcp->mc_fsbase = pcb->pcb_fsbase;
187 mcp->mc_gsbase = pcb->pcb_gsbase;
188 mcp->mc_xfpustate = 0;
189 mcp->mc_xfpustate_len = 0;
190 bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
195 * Set machine context.
197 * However, we don't set any but the user modifiable flags, and we won't
198 * touch the cs selector.
201 ia32_set_mcontext(struct thread *td, struct ia32_mcontext *mcp)
203 struct trapframe *tp;
209 if (mcp->mc_len != sizeof(*mcp))
211 rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
212 (tp->tf_rflags & ~PSL_USERCHANGE);
213 if (mcp->mc_flags & _MC_IA32_HASFPXSTATE) {
214 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
215 sizeof(struct savefpu))
217 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
218 ret = copyin(PTRIN(mcp->mc_xfpustate), xfpustate,
219 mcp->mc_xfpustate_len);
224 ret = ia32_set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
227 tp->tf_gs = mcp->mc_gs;
228 tp->tf_fs = mcp->mc_fs;
229 tp->tf_es = mcp->mc_es;
230 tp->tf_ds = mcp->mc_ds;
231 tp->tf_flags = TF_HASSEGS;
232 tp->tf_rdi = mcp->mc_edi;
233 tp->tf_rsi = mcp->mc_esi;
234 tp->tf_rbp = mcp->mc_ebp;
235 tp->tf_rbx = mcp->mc_ebx;
236 tp->tf_rdx = mcp->mc_edx;
237 tp->tf_rcx = mcp->mc_ecx;
238 tp->tf_rax = mcp->mc_eax;
240 tp->tf_rip = mcp->mc_eip;
241 tp->tf_rflags = rflags;
242 tp->tf_rsp = mcp->mc_esp;
243 tp->tf_ss = mcp->mc_ss;
244 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
249 * The first two fields of a ucontext_t are the signal mask and
250 * the machine context. The next field is uc_link; we want to
251 * avoid destroying the link when copying out contexts.
253 #define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link)
256 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
258 struct ia32_ucontext uc;
261 if (uap->ucp == NULL)
264 bzero(&uc, sizeof(uc));
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->ucp, UC_COPY_SIZE);
275 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
277 struct ia32_ucontext uc;
280 if (uap->ucp == NULL)
283 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
285 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
287 kern_sigprocmask(td, SIG_SETMASK,
288 &uc.uc_sigmask, NULL, 0);
292 return (ret == 0 ? EJUSTRETURN : ret);
296 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
298 struct ia32_ucontext uc;
301 if (uap->oucp == NULL || uap->ucp == NULL)
304 bzero(&uc, sizeof(uc));
305 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
306 PROC_LOCK(td->td_proc);
307 uc.uc_sigmask = td->td_sigmask;
308 PROC_UNLOCK(td->td_proc);
309 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
311 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
313 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
315 kern_sigprocmask(td, SIG_SETMASK,
316 &uc.uc_sigmask, NULL, 0);
321 return (ret == 0 ? EJUSTRETURN : ret);
325 * Send an interrupt to process.
327 * Stack is set up to allow sigcode stored
328 * at top to call routine, followed by kcall
329 * to sigreturn routine below. After sigreturn
330 * resets the signal mask, the stack, and the
331 * frame pointer, it returns to the user
337 ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
339 struct ia32_sigframe3 sf, *fp;
343 struct trapframe *regs;
349 PROC_LOCK_ASSERT(p, MA_OWNED);
350 sig = ksi->ksi_signo;
352 mtx_assert(&psp->ps_mtx, MA_OWNED);
354 oonstack = sigonstack(regs->tf_rsp);
356 /* Allocate space for the signal handler context. */
357 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
358 SIGISMEMBER(psp->ps_sigonstack, sig)) {
359 fp = (struct ia32_sigframe3 *)((uintptr_t)td->td_sigstk.ss_sp +
360 td->td_sigstk.ss_size - sizeof(sf));
361 td->td_sigstk.ss_flags |= SS_ONSTACK;
363 fp = (struct ia32_sigframe3 *)regs->tf_rsp - 1;
365 /* Build the argument list for the signal handler. */
367 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
368 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
369 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
370 /* Signal handler installed with SA_SIGINFO. */
371 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
372 sf.sf_siginfo.si_signo = sig;
373 sf.sf_siginfo.si_code = ksi->ksi_code;
374 sf.sf_ah = (uintptr_t)catcher;
377 /* Old FreeBSD-style arguments. */
378 sf.sf_arg2 = ksi->ksi_code;
379 sf.sf_addr = (register_t)ksi->ksi_addr;
380 sf.sf_ah = (uintptr_t)catcher;
382 mtx_unlock(&psp->ps_mtx);
385 /* Save most if not all of trap frame. */
386 sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax;
387 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx;
388 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx;
389 sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx;
390 sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi;
391 sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi;
392 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
393 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
394 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
395 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
396 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
397 sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs;
398 sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp;
400 /* Build the signal context to be used by osigreturn(). */
401 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
402 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
403 sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp;
404 sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp;
405 sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip;
406 sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags;
407 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
408 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
411 * Copy the sigframe out to the user's stack.
413 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
415 printf("process %ld has trashed its stack\n", (long)p->p_pid);
421 regs->tf_rsp = (uintptr_t)fp;
422 regs->tf_rip = p->p_sysent->sv_psstrings - sz_ia32_osigcode;
423 regs->tf_rflags &= ~(PSL_T | PSL_D);
424 regs->tf_cs = _ucode32sel;
425 regs->tf_ds = _udatasel;
426 regs->tf_es = _udatasel;
427 regs->tf_fs = _udatasel;
428 regs->tf_ss = _udatasel;
429 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
431 mtx_lock(&psp->ps_mtx);
435 #ifdef COMPAT_FREEBSD4
437 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
439 struct ia32_sigframe4 sf, *sfp;
440 struct siginfo32 siginfo;
444 struct trapframe *regs;
450 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
452 PROC_LOCK_ASSERT(p, MA_OWNED);
453 sig = siginfo.si_signo;
455 mtx_assert(&psp->ps_mtx, MA_OWNED);
457 oonstack = sigonstack(regs->tf_rsp);
459 /* Save user context. */
460 bzero(&sf, sizeof(sf));
461 sf.sf_uc.uc_sigmask = *mask;
462 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
463 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
464 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
465 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
466 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
467 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
468 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
469 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
470 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
471 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
472 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
473 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
474 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
475 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
476 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
477 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
478 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
479 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
480 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
481 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
482 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
483 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
484 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
485 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
486 bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
487 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
488 bzero(sf.sf_uc.uc_mcontext.__spare__,
489 sizeof(sf.sf_uc.uc_mcontext.__spare__));
490 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
492 /* Allocate space for the signal handler context. */
493 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
494 SIGISMEMBER(psp->ps_sigonstack, sig)) {
495 sfp = (struct ia32_sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
496 td->td_sigstk.ss_size - sizeof(sf));
498 sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
501 /* Build the argument list for the signal handler. */
503 sf.sf_ucontext = (register_t)&sfp->sf_uc;
504 bzero(&sf.sf_si, sizeof(sf.sf_si));
505 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
506 /* Signal handler installed with SA_SIGINFO. */
507 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
508 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
510 /* Fill in POSIX parts */
512 sf.sf_si.si_signo = sig;
514 /* Old FreeBSD-style arguments. */
515 sf.sf_siginfo = siginfo.si_code;
516 sf.sf_addr = (u_int32_t)siginfo.si_addr;
517 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
519 mtx_unlock(&psp->ps_mtx);
522 * Copy the sigframe out to the user's stack.
524 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
526 printf("process %ld has trashed its stack\n", (long)p->p_pid);
532 regs->tf_rsp = (uintptr_t)sfp;
533 regs->tf_rip = p->p_sysent->sv_sigcode_base + sz_ia32_sigcode -
534 sz_freebsd4_ia32_sigcode;
535 regs->tf_rflags &= ~(PSL_T | PSL_D);
536 regs->tf_cs = _ucode32sel;
537 regs->tf_ss = _udatasel;
538 regs->tf_ds = _udatasel;
539 regs->tf_es = _udatasel;
540 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
541 /* leave user %fs and %gs untouched */
543 mtx_lock(&psp->ps_mtx);
545 #endif /* COMPAT_FREEBSD4 */
548 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
550 struct ia32_sigframe sf, *sfp;
551 struct siginfo32 siginfo;
556 struct trapframe *regs;
562 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
565 PROC_LOCK_ASSERT(p, MA_OWNED);
566 sig = siginfo.si_signo;
568 #ifdef COMPAT_FREEBSD4
569 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
570 freebsd4_ia32_sendsig(catcher, ksi, mask);
575 if (SIGISMEMBER(psp->ps_osigset, sig)) {
576 ia32_osendsig(catcher, ksi, mask);
580 mtx_assert(&psp->ps_mtx, MA_OWNED);
582 oonstack = sigonstack(regs->tf_rsp);
584 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
585 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
586 xfpusave = __builtin_alloca(xfpusave_len);
592 /* Save user context. */
593 bzero(&sf, sizeof(sf));
594 sf.sf_uc.uc_sigmask = *mask;
595 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
596 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
597 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
598 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
599 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
600 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
601 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
602 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
603 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
604 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
605 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
606 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
607 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
608 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
609 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
610 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
611 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
612 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
613 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
614 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
615 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
616 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
617 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
618 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
619 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
620 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
622 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
623 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
625 /* Allocate space for the signal handler context. */
626 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
627 SIGISMEMBER(psp->ps_sigonstack, sig))
628 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
630 sp = (char *)regs->tf_rsp;
631 if (xfpusave != NULL) {
633 sp = (char *)((unsigned long)sp & ~0x3Ful);
634 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
637 /* Align to 16 bytes. */
638 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
641 /* Build the argument list for the signal handler. */
643 sf.sf_ucontext = (register_t)&sfp->sf_uc;
644 bzero(&sf.sf_si, sizeof(sf.sf_si));
645 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
646 /* Signal handler installed with SA_SIGINFO. */
647 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
648 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
650 /* Fill in POSIX parts */
652 sf.sf_si.si_signo = sig;
654 /* Old FreeBSD-style arguments. */
655 sf.sf_siginfo = siginfo.si_code;
656 sf.sf_addr = (u_int32_t)siginfo.si_addr;
657 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
659 mtx_unlock(&psp->ps_mtx);
662 * Copy the sigframe out to the user's stack.
664 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
665 (xfpusave != NULL && copyout(xfpusave,
666 PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len)
669 printf("process %ld has trashed its stack\n", (long)p->p_pid);
675 regs->tf_rsp = (uintptr_t)sfp;
676 regs->tf_rip = p->p_sysent->sv_sigcode_base;
677 regs->tf_rflags &= ~(PSL_T | PSL_D);
678 regs->tf_cs = _ucode32sel;
679 regs->tf_ss = _udatasel;
680 regs->tf_ds = _udatasel;
681 regs->tf_es = _udatasel;
682 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
683 /* XXXKIB leave user %fs and %gs untouched */
685 mtx_lock(&psp->ps_mtx);
689 * System call to cleanup state after a signal
690 * has been taken. Reset signal mask and
691 * stack state from context left by sendsig (above).
692 * Return to previous pc and psl as specified by
693 * context left by sendsig. Check carefully to
694 * make sure that the user has not modified the
695 * state to gain improper privileges.
700 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
702 struct ia32_sigcontext3 sc, *scp;
703 struct trapframe *regs;
708 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
712 eflags = scp->sc_eflags;
713 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
716 if (!CS_SECURE(scp->sc_cs)) {
717 ksiginfo_init_trap(&ksi);
718 ksi.ksi_signo = SIGBUS;
719 ksi.ksi_code = BUS_OBJERR;
720 ksi.ksi_trapno = T_PROTFLT;
721 ksi.ksi_addr = (void *)regs->tf_rip;
722 trapsignal(td, &ksi);
725 regs->tf_ds = scp->sc_ds;
726 regs->tf_es = scp->sc_es;
727 regs->tf_fs = scp->sc_fs;
728 regs->tf_gs = scp->sc_gs;
730 regs->tf_rax = scp->sc_eax;
731 regs->tf_rbx = scp->sc_ebx;
732 regs->tf_rcx = scp->sc_ecx;
733 regs->tf_rdx = scp->sc_edx;
734 regs->tf_rsi = scp->sc_esi;
735 regs->tf_rdi = scp->sc_edi;
736 regs->tf_cs = scp->sc_cs;
737 regs->tf_ss = scp->sc_ss;
738 regs->tf_rbp = scp->sc_ebp;
739 regs->tf_rsp = scp->sc_esp;
740 regs->tf_rip = scp->sc_eip;
741 regs->tf_rflags = eflags;
743 if (scp->sc_onstack & 1)
744 td->td_sigstk.ss_flags |= SS_ONSTACK;
746 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
748 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
750 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
751 return (EJUSTRETURN);
755 #ifdef COMPAT_FREEBSD4
760 freebsd4_freebsd32_sigreturn(td, uap)
762 struct freebsd4_freebsd32_sigreturn_args /* {
763 const struct freebsd4_freebsd32_ucontext *sigcntxp;
766 struct ia32_ucontext4 uc;
767 struct trapframe *regs;
768 struct ia32_ucontext4 *ucp;
769 int cs, eflags, error;
772 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
777 eflags = ucp->uc_mcontext.mc_eflags;
779 * Don't allow users to change privileged or reserved flags.
781 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
782 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
783 td->td_proc->p_pid, td->td_name, eflags);
788 * Don't allow users to load a valid privileged %cs. Let the
789 * hardware check for invalid selectors, excess privilege in
790 * other selectors, invalid %eip's and invalid %esp's.
792 cs = ucp->uc_mcontext.mc_cs;
793 if (!CS_SECURE(cs)) {
794 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
795 td->td_proc->p_pid, td->td_name, cs);
796 ksiginfo_init_trap(&ksi);
797 ksi.ksi_signo = SIGBUS;
798 ksi.ksi_code = BUS_OBJERR;
799 ksi.ksi_trapno = T_PROTFLT;
800 ksi.ksi_addr = (void *)regs->tf_rip;
801 trapsignal(td, &ksi);
805 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
806 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
807 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
808 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
809 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
810 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
811 regs->tf_rax = ucp->uc_mcontext.mc_eax;
812 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
813 regs->tf_err = ucp->uc_mcontext.mc_err;
814 regs->tf_rip = ucp->uc_mcontext.mc_eip;
816 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
817 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
818 regs->tf_ss = ucp->uc_mcontext.mc_ss;
819 regs->tf_ds = ucp->uc_mcontext.mc_ds;
820 regs->tf_es = ucp->uc_mcontext.mc_es;
821 regs->tf_fs = ucp->uc_mcontext.mc_fs;
822 regs->tf_gs = ucp->uc_mcontext.mc_gs;
824 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
825 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
826 return (EJUSTRETURN);
828 #endif /* COMPAT_FREEBSD4 */
834 freebsd32_sigreturn(td, uap)
836 struct freebsd32_sigreturn_args /* {
837 const struct freebsd32_ucontext *sigcntxp;
840 struct ia32_ucontext uc;
841 struct trapframe *regs;
842 struct ia32_ucontext *ucp;
844 size_t xfpustate_len;
845 int cs, eflags, error, ret;
848 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
853 eflags = ucp->uc_mcontext.mc_eflags;
855 * Don't allow users to change privileged or reserved flags.
857 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
858 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
859 td->td_proc->p_pid, td->td_name, eflags);
864 * Don't allow users to load a valid privileged %cs. Let the
865 * hardware check for invalid selectors, excess privilege in
866 * other selectors, invalid %eip's and invalid %esp's.
868 cs = ucp->uc_mcontext.mc_cs;
869 if (!CS_SECURE(cs)) {
870 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
871 td->td_proc->p_pid, td->td_name, cs);
872 ksiginfo_init_trap(&ksi);
873 ksi.ksi_signo = SIGBUS;
874 ksi.ksi_code = BUS_OBJERR;
875 ksi.ksi_trapno = T_PROTFLT;
876 ksi.ksi_addr = (void *)regs->tf_rip;
877 trapsignal(td, &ksi);
881 if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
882 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
883 if (xfpustate_len > cpu_max_ext_state_size -
884 sizeof(struct savefpu)) {
885 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
886 td->td_proc->p_pid, td->td_name, xfpustate_len);
889 xfpustate = __builtin_alloca(xfpustate_len);
890 error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate),
891 xfpustate, xfpustate_len);
894 "pid %d (%s): sigreturn copying xfpustate failed\n",
895 td->td_proc->p_pid, td->td_name);
902 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
905 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
906 td->td_proc->p_pid, td->td_name, ret);
910 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
911 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
912 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
913 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
914 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
915 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
916 regs->tf_rax = ucp->uc_mcontext.mc_eax;
917 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
918 regs->tf_err = ucp->uc_mcontext.mc_err;
919 regs->tf_rip = ucp->uc_mcontext.mc_eip;
921 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
922 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
923 regs->tf_ss = ucp->uc_mcontext.mc_ss;
924 regs->tf_ds = ucp->uc_mcontext.mc_ds;
925 regs->tf_es = ucp->uc_mcontext.mc_es;
926 regs->tf_fs = ucp->uc_mcontext.mc_fs;
927 regs->tf_gs = ucp->uc_mcontext.mc_gs;
928 regs->tf_flags = TF_HASSEGS;
930 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
931 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
932 return (EJUSTRETURN);
936 * Clear registers on exec
939 ia32_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack)
941 struct trapframe *regs;
943 register_t saved_rflags;
948 if (td->td_proc->p_md.md_ldt != NULL)
956 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
958 saved_rflags = regs->tf_rflags & PSL_T;
959 bzero((char *)regs, sizeof(struct trapframe));
960 regs->tf_rip = imgp->entry_addr;
961 regs->tf_rsp = stack;
962 regs->tf_rflags = PSL_USER | saved_rflags;
963 regs->tf_ss = _udatasel;
964 regs->tf_cs = _ucode32sel;
965 regs->tf_rbx = imgp->ps_strings;
966 regs->tf_ds = _udatasel;
967 regs->tf_es = _udatasel;
968 regs->tf_fs = _ufssel;
969 regs->tf_gs = _ugssel;
970 regs->tf_flags = TF_HASSEGS;
974 /* Return via doreti so that we can change to a different %cs */
975 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);