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 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
265 PROC_LOCK(td->td_proc);
266 uc.uc_sigmask = td->td_sigmask;
267 PROC_UNLOCK(td->td_proc);
268 bzero(&uc.__spare__, sizeof(uc.__spare__));
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 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
305 PROC_LOCK(td->td_proc);
306 uc.uc_sigmask = td->td_sigmask;
307 PROC_UNLOCK(td->td_proc);
308 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
310 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
312 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
314 kern_sigprocmask(td, SIG_SETMASK,
315 &uc.uc_sigmask, NULL, 0);
320 return (ret == 0 ? EJUSTRETURN : ret);
324 * Send an interrupt to process.
326 * Stack is set up to allow sigcode stored
327 * at top to call routine, followed by kcall
328 * to sigreturn routine below. After sigreturn
329 * resets the signal mask, the stack, and the
330 * frame pointer, it returns to the user
336 ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
338 struct ia32_sigframe3 sf, *fp;
342 struct trapframe *regs;
348 PROC_LOCK_ASSERT(p, MA_OWNED);
349 sig = ksi->ksi_signo;
351 mtx_assert(&psp->ps_mtx, MA_OWNED);
353 oonstack = sigonstack(regs->tf_rsp);
355 /* Allocate space for the signal handler context. */
356 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
357 SIGISMEMBER(psp->ps_sigonstack, sig)) {
358 fp = (struct ia32_sigframe3 *)((uintptr_t)td->td_sigstk.ss_sp +
359 td->td_sigstk.ss_size - sizeof(sf));
360 td->td_sigstk.ss_flags |= SS_ONSTACK;
362 fp = (struct ia32_sigframe3 *)regs->tf_rsp - 1;
364 /* Build the argument list for the signal handler. */
366 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
367 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
368 /* Signal handler installed with SA_SIGINFO. */
369 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
370 sf.sf_siginfo.si_signo = sig;
371 sf.sf_siginfo.si_code = ksi->ksi_code;
372 sf.sf_ah = (uintptr_t)catcher;
374 /* Old FreeBSD-style arguments. */
375 sf.sf_arg2 = ksi->ksi_code;
376 sf.sf_addr = (register_t)ksi->ksi_addr;
377 sf.sf_ah = (uintptr_t)catcher;
379 mtx_unlock(&psp->ps_mtx);
382 /* Save most if not all of trap frame. */
383 sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax;
384 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx;
385 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx;
386 sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx;
387 sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi;
388 sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi;
389 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
390 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
391 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
392 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
393 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
394 sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs;
395 sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp;
397 /* Build the signal context to be used by osigreturn(). */
398 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
399 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
400 sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp;
401 sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp;
402 sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip;
403 sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags;
404 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
405 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
408 * Copy the sigframe out to the user's stack.
410 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
412 printf("process %ld has trashed its stack\n", (long)p->p_pid);
418 regs->tf_rsp = (uintptr_t)fp;
419 regs->tf_rip = p->p_sysent->sv_psstrings - sz_ia32_osigcode;
420 regs->tf_rflags &= ~(PSL_T | PSL_D);
421 regs->tf_cs = _ucode32sel;
422 regs->tf_ds = _udatasel;
423 regs->tf_es = _udatasel;
424 regs->tf_fs = _udatasel;
425 regs->tf_ss = _udatasel;
426 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
428 mtx_lock(&psp->ps_mtx);
432 #ifdef COMPAT_FREEBSD4
434 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
436 struct ia32_sigframe4 sf, *sfp;
437 struct siginfo32 siginfo;
441 struct trapframe *regs;
447 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
449 PROC_LOCK_ASSERT(p, MA_OWNED);
450 sig = siginfo.si_signo;
452 mtx_assert(&psp->ps_mtx, MA_OWNED);
454 oonstack = sigonstack(regs->tf_rsp);
456 /* Save user context. */
457 bzero(&sf, sizeof(sf));
458 sf.sf_uc.uc_sigmask = *mask;
459 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
460 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
461 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
462 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
463 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
464 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
465 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
466 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
467 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
468 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
469 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
470 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
471 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
472 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
473 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
474 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
475 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
476 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
477 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
478 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
479 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
480 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
481 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
482 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
483 bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
484 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
485 bzero(sf.sf_uc.uc_mcontext.__spare__,
486 sizeof(sf.sf_uc.uc_mcontext.__spare__));
487 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
489 /* Allocate space for the signal handler context. */
490 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
491 SIGISMEMBER(psp->ps_sigonstack, sig)) {
492 sfp = (struct ia32_sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
493 td->td_sigstk.ss_size - sizeof(sf));
495 sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
498 /* Build the argument list for the signal handler. */
500 sf.sf_ucontext = (register_t)&sfp->sf_uc;
501 bzero(&sf.sf_si, sizeof(sf.sf_si));
502 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
503 /* Signal handler installed with SA_SIGINFO. */
504 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
505 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
507 /* Fill in POSIX parts */
509 sf.sf_si.si_signo = sig;
511 /* Old FreeBSD-style arguments. */
512 sf.sf_siginfo = siginfo.si_code;
513 sf.sf_addr = (u_int32_t)siginfo.si_addr;
514 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
516 mtx_unlock(&psp->ps_mtx);
519 * Copy the sigframe out to the user's stack.
521 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
523 printf("process %ld has trashed its stack\n", (long)p->p_pid);
529 regs->tf_rsp = (uintptr_t)sfp;
530 regs->tf_rip = p->p_sysent->sv_sigcode_base + sz_ia32_sigcode -
531 sz_freebsd4_ia32_sigcode;
532 regs->tf_rflags &= ~(PSL_T | PSL_D);
533 regs->tf_cs = _ucode32sel;
534 regs->tf_ss = _udatasel;
535 regs->tf_ds = _udatasel;
536 regs->tf_es = _udatasel;
537 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
538 /* leave user %fs and %gs untouched */
540 mtx_lock(&psp->ps_mtx);
542 #endif /* COMPAT_FREEBSD4 */
545 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
547 struct ia32_sigframe sf, *sfp;
548 struct siginfo32 siginfo;
553 struct trapframe *regs;
559 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
562 PROC_LOCK_ASSERT(p, MA_OWNED);
563 sig = siginfo.si_signo;
565 #ifdef COMPAT_FREEBSD4
566 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
567 freebsd4_ia32_sendsig(catcher, ksi, mask);
572 if (SIGISMEMBER(psp->ps_osigset, sig)) {
573 ia32_osendsig(catcher, ksi, mask);
577 mtx_assert(&psp->ps_mtx, MA_OWNED);
579 oonstack = sigonstack(regs->tf_rsp);
581 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
582 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
583 xfpusave = __builtin_alloca(xfpusave_len);
589 /* Save user context. */
590 bzero(&sf, sizeof(sf));
591 sf.sf_uc.uc_sigmask = *mask;
592 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
593 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
594 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
595 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
596 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
597 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
598 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
599 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
600 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
601 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
602 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
603 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
604 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
605 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
606 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
607 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
608 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
609 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
610 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
611 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
612 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
613 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
614 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
615 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
616 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
617 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
619 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
620 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
621 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
623 /* Allocate space for the signal handler context. */
624 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
625 SIGISMEMBER(psp->ps_sigonstack, sig))
626 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
628 sp = (char *)regs->tf_rsp;
629 if (xfpusave != NULL) {
631 sp = (char *)((unsigned long)sp & ~0x3Ful);
632 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
635 /* Align to 16 bytes. */
636 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
639 /* Build the argument list for the signal handler. */
641 sf.sf_ucontext = (register_t)&sfp->sf_uc;
642 bzero(&sf.sf_si, sizeof(sf.sf_si));
643 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
644 /* Signal handler installed with SA_SIGINFO. */
645 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
646 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
648 /* Fill in POSIX parts */
650 sf.sf_si.si_signo = sig;
652 /* Old FreeBSD-style arguments. */
653 sf.sf_siginfo = siginfo.si_code;
654 sf.sf_addr = (u_int32_t)siginfo.si_addr;
655 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
657 mtx_unlock(&psp->ps_mtx);
660 * Copy the sigframe out to the user's stack.
662 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
663 (xfpusave != NULL && copyout(xfpusave,
664 PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len)
667 printf("process %ld has trashed its stack\n", (long)p->p_pid);
673 regs->tf_rsp = (uintptr_t)sfp;
674 regs->tf_rip = p->p_sysent->sv_sigcode_base;
675 regs->tf_rflags &= ~(PSL_T | PSL_D);
676 regs->tf_cs = _ucode32sel;
677 regs->tf_ss = _udatasel;
678 regs->tf_ds = _udatasel;
679 regs->tf_es = _udatasel;
680 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
681 /* XXXKIB leave user %fs and %gs untouched */
683 mtx_lock(&psp->ps_mtx);
687 * System call to cleanup state after a signal
688 * has been taken. Reset signal mask and
689 * stack state from context left by sendsig (above).
690 * Return to previous pc and psl as specified by
691 * context left by sendsig. Check carefully to
692 * make sure that the user has not modified the
693 * state to gain improper privileges.
698 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
700 struct ia32_sigcontext3 sc, *scp;
701 struct trapframe *regs;
706 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
710 eflags = scp->sc_eflags;
711 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
714 if (!CS_SECURE(scp->sc_cs)) {
715 ksiginfo_init_trap(&ksi);
716 ksi.ksi_signo = SIGBUS;
717 ksi.ksi_code = BUS_OBJERR;
718 ksi.ksi_trapno = T_PROTFLT;
719 ksi.ksi_addr = (void *)regs->tf_rip;
720 trapsignal(td, &ksi);
723 regs->tf_ds = scp->sc_ds;
724 regs->tf_es = scp->sc_es;
725 regs->tf_fs = scp->sc_fs;
726 regs->tf_gs = scp->sc_gs;
728 regs->tf_rax = scp->sc_eax;
729 regs->tf_rbx = scp->sc_ebx;
730 regs->tf_rcx = scp->sc_ecx;
731 regs->tf_rdx = scp->sc_edx;
732 regs->tf_rsi = scp->sc_esi;
733 regs->tf_rdi = scp->sc_edi;
734 regs->tf_cs = scp->sc_cs;
735 regs->tf_ss = scp->sc_ss;
736 regs->tf_rbp = scp->sc_ebp;
737 regs->tf_rsp = scp->sc_esp;
738 regs->tf_rip = scp->sc_eip;
739 regs->tf_rflags = eflags;
741 if (scp->sc_onstack & 1)
742 td->td_sigstk.ss_flags |= SS_ONSTACK;
744 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
746 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
748 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
749 return (EJUSTRETURN);
753 #ifdef COMPAT_FREEBSD4
758 freebsd4_freebsd32_sigreturn(td, uap)
760 struct freebsd4_freebsd32_sigreturn_args /* {
761 const struct freebsd4_freebsd32_ucontext *sigcntxp;
764 struct ia32_ucontext4 uc;
765 struct trapframe *regs;
766 struct ia32_ucontext4 *ucp;
767 int cs, eflags, error;
770 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
775 eflags = ucp->uc_mcontext.mc_eflags;
777 * Don't allow users to change privileged or reserved flags.
779 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
780 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
781 td->td_proc->p_pid, td->td_name, eflags);
786 * Don't allow users to load a valid privileged %cs. Let the
787 * hardware check for invalid selectors, excess privilege in
788 * other selectors, invalid %eip's and invalid %esp's.
790 cs = ucp->uc_mcontext.mc_cs;
791 if (!CS_SECURE(cs)) {
792 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
793 td->td_proc->p_pid, td->td_name, cs);
794 ksiginfo_init_trap(&ksi);
795 ksi.ksi_signo = SIGBUS;
796 ksi.ksi_code = BUS_OBJERR;
797 ksi.ksi_trapno = T_PROTFLT;
798 ksi.ksi_addr = (void *)regs->tf_rip;
799 trapsignal(td, &ksi);
803 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
804 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
805 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
806 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
807 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
808 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
809 regs->tf_rax = ucp->uc_mcontext.mc_eax;
810 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
811 regs->tf_err = ucp->uc_mcontext.mc_err;
812 regs->tf_rip = ucp->uc_mcontext.mc_eip;
814 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
815 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
816 regs->tf_ss = ucp->uc_mcontext.mc_ss;
817 regs->tf_ds = ucp->uc_mcontext.mc_ds;
818 regs->tf_es = ucp->uc_mcontext.mc_es;
819 regs->tf_fs = ucp->uc_mcontext.mc_fs;
820 regs->tf_gs = ucp->uc_mcontext.mc_gs;
822 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
823 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
824 return (EJUSTRETURN);
826 #endif /* COMPAT_FREEBSD4 */
832 freebsd32_sigreturn(td, uap)
834 struct freebsd32_sigreturn_args /* {
835 const struct freebsd32_ucontext *sigcntxp;
838 struct ia32_ucontext uc;
839 struct trapframe *regs;
840 struct ia32_ucontext *ucp;
842 size_t xfpustate_len;
843 int cs, eflags, error, ret;
846 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
851 eflags = ucp->uc_mcontext.mc_eflags;
853 * Don't allow users to change privileged or reserved flags.
855 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
856 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
857 td->td_proc->p_pid, td->td_name, eflags);
862 * Don't allow users to load a valid privileged %cs. Let the
863 * hardware check for invalid selectors, excess privilege in
864 * other selectors, invalid %eip's and invalid %esp's.
866 cs = ucp->uc_mcontext.mc_cs;
867 if (!CS_SECURE(cs)) {
868 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
869 td->td_proc->p_pid, td->td_name, cs);
870 ksiginfo_init_trap(&ksi);
871 ksi.ksi_signo = SIGBUS;
872 ksi.ksi_code = BUS_OBJERR;
873 ksi.ksi_trapno = T_PROTFLT;
874 ksi.ksi_addr = (void *)regs->tf_rip;
875 trapsignal(td, &ksi);
879 if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
880 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
881 if (xfpustate_len > cpu_max_ext_state_size -
882 sizeof(struct savefpu)) {
883 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
884 td->td_proc->p_pid, td->td_name, xfpustate_len);
887 xfpustate = __builtin_alloca(xfpustate_len);
888 error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate),
889 xfpustate, xfpustate_len);
892 "pid %d (%s): sigreturn copying xfpustate failed\n",
893 td->td_proc->p_pid, td->td_name);
900 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
903 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
904 td->td_proc->p_pid, td->td_name, ret);
908 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
909 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
910 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
911 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
912 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
913 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
914 regs->tf_rax = ucp->uc_mcontext.mc_eax;
915 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
916 regs->tf_err = ucp->uc_mcontext.mc_err;
917 regs->tf_rip = ucp->uc_mcontext.mc_eip;
919 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
920 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
921 regs->tf_ss = ucp->uc_mcontext.mc_ss;
922 regs->tf_ds = ucp->uc_mcontext.mc_ds;
923 regs->tf_es = ucp->uc_mcontext.mc_es;
924 regs->tf_fs = ucp->uc_mcontext.mc_fs;
925 regs->tf_gs = ucp->uc_mcontext.mc_gs;
926 regs->tf_flags = TF_HASSEGS;
928 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
929 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
930 return (EJUSTRETURN);
934 * Clear registers on exec
937 ia32_setregs(struct thread *td, struct image_params *imgp, u_long stack)
939 struct trapframe *regs;
941 register_t saved_rflags;
946 if (td->td_proc->p_md.md_ldt != NULL)
954 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
956 saved_rflags = regs->tf_rflags & PSL_T;
957 bzero((char *)regs, sizeof(struct trapframe));
958 regs->tf_rip = imgp->entry_addr;
959 regs->tf_rsp = stack;
960 regs->tf_rflags = PSL_USER | saved_rflags;
961 regs->tf_ss = _udatasel;
962 regs->tf_cs = _ucode32sel;
963 regs->tf_rbx = imgp->ps_strings;
964 regs->tf_ds = _udatasel;
965 regs->tf_es = _udatasel;
966 regs->tf_fs = _ufssel;
967 regs->tf_gs = _ugssel;
968 regs->tf_flags = TF_HASSEGS;
972 /* Return via doreti so that we can change to a different %cs */
973 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);