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>
50 #include <sys/procfs.h>
51 #include <sys/resourcevar.h>
52 #include <sys/systm.h>
53 #include <sys/signalvar.h>
56 #include <sys/syscall.h>
57 #include <sys/syscallsubr.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/freebsd32/freebsd32.h>
74 #include <compat/ia32/ia32_signal.h>
75 #include <machine/psl.h>
76 #include <machine/segments.h>
77 #include <machine/specialreg.h>
78 #include <machine/frame.h>
79 #include <machine/md_var.h>
80 #include <machine/pcb.h>
81 #include <machine/cpufunc.h>
82 #include <machine/trap.h>
84 #ifdef COMPAT_FREEBSD4
85 static void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
89 ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
90 char *xfpusave, size_t xfpusave_len)
95 * XXX Format of 64bit and 32bit FXSAVE areas differs. FXSAVE
96 * in 32bit mode saves %cs and %ds, while on 64bit it saves
97 * 64bit instruction and data pointers. Ignore the difference
98 * for now, it should be irrelevant for most applications.
100 mcp->mc_ownedfp = fpugetregs(td);
101 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
102 sizeof(mcp->mc_fpstate));
103 mcp->mc_fpformat = fpuformat();
104 if (!use_xsave || xfpusave_len == 0)
106 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
110 bzero(xfpusave + max_len, len - max_len);
112 mcp->mc_flags |= _MC_IA32_HASFPXSTATE;
113 mcp->mc_xfpustate_len = len;
114 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
118 ia32_set_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
119 char *xfpustate, size_t xfpustate_len)
123 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
125 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
127 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
128 /* We don't care what state is left in the FPU or PCB. */
131 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
132 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
133 error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate,
134 xfpustate, xfpustate_len);
141 * Get machine context.
144 ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
147 struct trapframe *tp;
152 PROC_LOCK(curthread->td_proc);
153 mcp->mc_onstack = sigonstack(tp->tf_rsp);
154 PROC_UNLOCK(curthread->td_proc);
155 /* Entry into kernel always sets TF_HASSEGS */
156 mcp->mc_gs = tp->tf_gs;
157 mcp->mc_fs = tp->tf_fs;
158 mcp->mc_es = tp->tf_es;
159 mcp->mc_ds = tp->tf_ds;
160 mcp->mc_edi = tp->tf_rdi;
161 mcp->mc_esi = tp->tf_rsi;
162 mcp->mc_ebp = tp->tf_rbp;
163 mcp->mc_isp = tp->tf_rsp;
164 mcp->mc_eflags = tp->tf_rflags;
165 if (flags & GET_MC_CLEAR_RET) {
168 mcp->mc_eflags &= ~PSL_C;
170 mcp->mc_eax = tp->tf_rax;
171 mcp->mc_edx = tp->tf_rdx;
173 mcp->mc_ebx = tp->tf_rbx;
174 mcp->mc_ecx = tp->tf_rcx;
175 mcp->mc_eip = tp->tf_rip;
176 mcp->mc_cs = tp->tf_cs;
177 mcp->mc_esp = tp->tf_rsp;
178 mcp->mc_ss = tp->tf_ss;
179 mcp->mc_len = sizeof(*mcp);
180 mcp->mc_flags = tp->tf_flags;
181 ia32_get_fpcontext(td, mcp, NULL, 0);
182 mcp->mc_fsbase = pcb->pcb_fsbase;
183 mcp->mc_gsbase = pcb->pcb_gsbase;
184 mcp->mc_xfpustate = 0;
185 mcp->mc_xfpustate_len = 0;
186 bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
191 * Set machine context.
193 * However, we don't set any but the user modifiable flags, and we won't
194 * touch the cs selector.
197 ia32_set_mcontext(struct thread *td, struct ia32_mcontext *mcp)
199 struct trapframe *tp;
205 if (mcp->mc_len != sizeof(*mcp))
207 rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
208 (tp->tf_rflags & ~PSL_USERCHANGE);
209 if (mcp->mc_flags & _MC_IA32_HASFPXSTATE) {
210 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
211 sizeof(struct savefpu))
213 xfpustate = (char *)td->td_md.md_fpu_scratch;
214 ret = copyin(PTRIN(mcp->mc_xfpustate), xfpustate,
215 mcp->mc_xfpustate_len);
220 ret = ia32_set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
223 tp->tf_gs = mcp->mc_gs;
224 tp->tf_fs = mcp->mc_fs;
225 tp->tf_es = mcp->mc_es;
226 tp->tf_ds = mcp->mc_ds;
227 tp->tf_flags = TF_HASSEGS;
228 tp->tf_rdi = mcp->mc_edi;
229 tp->tf_rsi = mcp->mc_esi;
230 tp->tf_rbp = mcp->mc_ebp;
231 tp->tf_rbx = mcp->mc_ebx;
232 tp->tf_rdx = mcp->mc_edx;
233 tp->tf_rcx = mcp->mc_ecx;
234 tp->tf_rax = mcp->mc_eax;
236 tp->tf_rip = mcp->mc_eip;
237 tp->tf_rflags = rflags;
238 tp->tf_rsp = mcp->mc_esp;
239 tp->tf_ss = mcp->mc_ss;
240 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
245 * The first two fields of a ucontext_t are the signal mask and
246 * the machine context. The next field is uc_link; we want to
247 * avoid destroying the link when copying out contexts.
249 #define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link)
252 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
254 struct ia32_ucontext uc;
257 if (uap->ucp == NULL)
260 bzero(&uc, sizeof(uc));
261 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
262 PROC_LOCK(td->td_proc);
263 uc.uc_sigmask = td->td_sigmask;
264 PROC_UNLOCK(td->td_proc);
265 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
271 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
273 struct ia32_ucontext uc;
276 if (uap->ucp == NULL)
279 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
281 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
283 kern_sigprocmask(td, SIG_SETMASK,
284 &uc.uc_sigmask, NULL, 0);
288 return (ret == 0 ? EJUSTRETURN : ret);
292 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
294 struct ia32_ucontext uc;
297 if (uap->oucp == NULL || uap->ucp == NULL)
300 bzero(&uc, sizeof(uc));
301 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
302 PROC_LOCK(td->td_proc);
303 uc.uc_sigmask = td->td_sigmask;
304 PROC_UNLOCK(td->td_proc);
305 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
307 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
309 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
311 kern_sigprocmask(td, SIG_SETMASK,
312 &uc.uc_sigmask, NULL, 0);
317 return (ret == 0 ? EJUSTRETURN : ret);
321 * Send an interrupt to process.
323 * Stack is set up to allow sigcode stored
324 * at top to call routine, followed by kcall
325 * to sigreturn routine below. After sigreturn
326 * resets the signal mask, the stack, and the
327 * frame pointer, it returns to the user
333 ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
335 struct ia32_sigframe3 sf, *fp;
339 struct trapframe *regs;
345 PROC_LOCK_ASSERT(p, MA_OWNED);
346 sig = ksi->ksi_signo;
348 mtx_assert(&psp->ps_mtx, MA_OWNED);
350 oonstack = sigonstack(regs->tf_rsp);
352 /* Allocate space for the signal handler context. */
353 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
354 SIGISMEMBER(psp->ps_sigonstack, sig)) {
355 fp = (struct ia32_sigframe3 *)((uintptr_t)td->td_sigstk.ss_sp +
356 td->td_sigstk.ss_size - sizeof(sf));
357 td->td_sigstk.ss_flags |= SS_ONSTACK;
359 fp = (struct ia32_sigframe3 *)regs->tf_rsp - 1;
361 /* Build the argument list for the signal handler. */
363 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
364 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
365 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
366 /* Signal handler installed with SA_SIGINFO. */
367 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
368 sf.sf_siginfo.si_signo = sig;
369 sf.sf_siginfo.si_code = ksi->ksi_code;
370 sf.sf_ah = (uintptr_t)catcher;
373 /* Old FreeBSD-style arguments. */
374 sf.sf_arg2 = ksi->ksi_code;
375 sf.sf_addr = (register_t)ksi->ksi_addr;
376 sf.sf_ah = (uintptr_t)catcher;
378 mtx_unlock(&psp->ps_mtx);
381 /* Save most if not all of trap frame. */
382 sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax;
383 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx;
384 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx;
385 sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx;
386 sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi;
387 sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi;
388 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
389 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
390 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
391 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
392 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
393 sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs;
394 sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp;
396 /* Build the signal context to be used by osigreturn(). */
397 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
398 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
399 sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp;
400 sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp;
401 sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip;
402 sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags;
403 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
404 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
407 * Copy the sigframe out to the user's stack.
409 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
411 printf("process %ld has trashed its stack\n", (long)p->p_pid);
417 regs->tf_rsp = (uintptr_t)fp;
418 regs->tf_rip = p->p_sysent->sv_psstrings - sz_ia32_osigcode;
419 regs->tf_rflags &= ~(PSL_T | PSL_D);
420 regs->tf_cs = _ucode32sel;
421 regs->tf_ds = _udatasel;
422 regs->tf_es = _udatasel;
423 regs->tf_fs = _udatasel;
424 regs->tf_ss = _udatasel;
425 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
427 mtx_lock(&psp->ps_mtx);
431 #ifdef COMPAT_FREEBSD4
433 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
435 struct ia32_sigframe4 sf, *sfp;
436 struct siginfo32 siginfo;
440 struct trapframe *regs;
446 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
448 PROC_LOCK_ASSERT(p, MA_OWNED);
449 sig = siginfo.si_signo;
451 mtx_assert(&psp->ps_mtx, MA_OWNED);
453 oonstack = sigonstack(regs->tf_rsp);
455 /* Save user context. */
456 bzero(&sf, sizeof(sf));
457 sf.sf_uc.uc_sigmask = *mask;
458 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
459 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
460 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
461 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
462 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
463 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
464 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
465 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
466 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
467 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
468 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
469 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
470 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
471 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
472 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
473 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
474 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
475 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
476 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
477 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
478 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
479 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
480 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
481 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
482 bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
483 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
484 bzero(sf.sf_uc.uc_mcontext.__spare__,
485 sizeof(sf.sf_uc.uc_mcontext.__spare__));
486 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
488 /* Allocate space for the signal handler context. */
489 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
490 SIGISMEMBER(psp->ps_sigonstack, sig)) {
491 sfp = (struct ia32_sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
492 td->td_sigstk.ss_size - sizeof(sf));
494 sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
497 /* Build the argument list for the signal handler. */
499 sf.sf_ucontext = (register_t)&sfp->sf_uc;
500 bzero(&sf.sf_si, sizeof(sf.sf_si));
501 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
502 /* Signal handler installed with SA_SIGINFO. */
503 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
504 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
506 /* Fill in POSIX parts */
508 sf.sf_si.si_signo = sig;
510 /* Old FreeBSD-style arguments. */
511 sf.sf_siginfo = siginfo.si_code;
512 sf.sf_addr = (u_int32_t)siginfo.si_addr;
513 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
515 mtx_unlock(&psp->ps_mtx);
518 * Copy the sigframe out to the user's stack.
520 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
522 printf("process %ld has trashed its stack\n", (long)p->p_pid);
528 regs->tf_rsp = (uintptr_t)sfp;
529 regs->tf_rip = p->p_sysent->sv_sigcode_base + sz_ia32_sigcode -
530 sz_freebsd4_ia32_sigcode;
531 regs->tf_rflags &= ~(PSL_T | PSL_D);
532 regs->tf_cs = _ucode32sel;
533 regs->tf_ss = _udatasel;
534 regs->tf_ds = _udatasel;
535 regs->tf_es = _udatasel;
536 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
537 /* leave user %fs and %gs untouched */
539 mtx_lock(&psp->ps_mtx);
541 #endif /* COMPAT_FREEBSD4 */
544 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
546 struct ia32_sigframe sf, *sfp;
547 struct siginfo32 siginfo;
552 struct trapframe *regs;
558 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
561 PROC_LOCK_ASSERT(p, MA_OWNED);
562 sig = siginfo.si_signo;
564 #ifdef COMPAT_FREEBSD4
565 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
566 freebsd4_ia32_sendsig(catcher, ksi, mask);
571 if (SIGISMEMBER(psp->ps_osigset, sig)) {
572 ia32_osendsig(catcher, ksi, mask);
576 mtx_assert(&psp->ps_mtx, MA_OWNED);
578 oonstack = sigonstack(regs->tf_rsp);
580 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
581 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
582 xfpusave = (char *)td->td_md.md_fpu_scratch;
588 /* Save user context. */
589 bzero(&sf, sizeof(sf));
590 sf.sf_uc.uc_sigmask = *mask;
591 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
592 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
593 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
594 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
595 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
596 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
597 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
598 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
599 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
600 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
601 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
602 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
603 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
604 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
605 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
606 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
607 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
608 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
609 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
610 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
611 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
612 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
613 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
614 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
615 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
616 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
618 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
619 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
621 /* Allocate space for the signal handler context. */
622 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
623 SIGISMEMBER(psp->ps_sigonstack, sig))
624 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
626 sp = (char *)regs->tf_rsp;
627 if (xfpusave != NULL) {
629 sp = (char *)((unsigned long)sp & ~0x3Ful);
630 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
633 /* Align to 16 bytes. */
634 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
637 /* Build the argument list for the signal handler. */
639 sf.sf_ucontext = (register_t)&sfp->sf_uc;
640 bzero(&sf.sf_si, sizeof(sf.sf_si));
641 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
642 /* Signal handler installed with SA_SIGINFO. */
643 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
644 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
646 /* Fill in POSIX parts */
648 sf.sf_si.si_signo = sig;
650 /* Old FreeBSD-style arguments. */
651 sf.sf_siginfo = siginfo.si_code;
652 sf.sf_addr = (u_int32_t)siginfo.si_addr;
653 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
655 mtx_unlock(&psp->ps_mtx);
658 * Copy the sigframe out to the user's stack.
660 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
661 (xfpusave != NULL && copyout(xfpusave,
662 PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len)
665 printf("process %ld has trashed its stack\n", (long)p->p_pid);
671 regs->tf_rsp = (uintptr_t)sfp;
672 regs->tf_rip = p->p_sysent->sv_sigcode_base;
673 regs->tf_rflags &= ~(PSL_T | PSL_D);
674 regs->tf_cs = _ucode32sel;
675 regs->tf_ss = _udatasel;
676 regs->tf_ds = _udatasel;
677 regs->tf_es = _udatasel;
678 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
679 /* XXXKIB leave user %fs and %gs untouched */
681 mtx_lock(&psp->ps_mtx);
685 * System call to cleanup state after a signal
686 * has been taken. Reset signal mask and
687 * stack state from context left by sendsig (above).
688 * Return to previous pc and psl as specified by
689 * context left by sendsig. Check carefully to
690 * make sure that the user has not modified the
691 * state to gain improper privileges.
696 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
698 struct ia32_sigcontext3 sc, *scp;
699 struct trapframe *regs;
704 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
708 eflags = scp->sc_eflags;
709 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
712 if (!CS_SECURE(scp->sc_cs)) {
713 ksiginfo_init_trap(&ksi);
714 ksi.ksi_signo = SIGBUS;
715 ksi.ksi_code = BUS_OBJERR;
716 ksi.ksi_trapno = T_PROTFLT;
717 ksi.ksi_addr = (void *)regs->tf_rip;
718 trapsignal(td, &ksi);
721 regs->tf_ds = scp->sc_ds;
722 regs->tf_es = scp->sc_es;
723 regs->tf_fs = scp->sc_fs;
724 regs->tf_gs = scp->sc_gs;
726 regs->tf_rax = scp->sc_eax;
727 regs->tf_rbx = scp->sc_ebx;
728 regs->tf_rcx = scp->sc_ecx;
729 regs->tf_rdx = scp->sc_edx;
730 regs->tf_rsi = scp->sc_esi;
731 regs->tf_rdi = scp->sc_edi;
732 regs->tf_cs = scp->sc_cs;
733 regs->tf_ss = scp->sc_ss;
734 regs->tf_rbp = scp->sc_ebp;
735 regs->tf_rsp = scp->sc_esp;
736 regs->tf_rip = scp->sc_eip;
737 regs->tf_rflags = eflags;
739 if (scp->sc_onstack & 1)
740 td->td_sigstk.ss_flags |= SS_ONSTACK;
742 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
744 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
746 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
747 return (EJUSTRETURN);
751 #ifdef COMPAT_FREEBSD4
756 freebsd4_freebsd32_sigreturn(td, uap)
758 struct freebsd4_freebsd32_sigreturn_args /* {
759 const struct freebsd4_freebsd32_ucontext *sigcntxp;
762 struct ia32_ucontext4 uc;
763 struct trapframe *regs;
764 struct ia32_ucontext4 *ucp;
765 int cs, eflags, error;
768 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
773 eflags = ucp->uc_mcontext.mc_eflags;
775 * Don't allow users to change privileged or reserved flags.
777 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
778 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
779 td->td_proc->p_pid, td->td_name, eflags);
784 * Don't allow users to load a valid privileged %cs. Let the
785 * hardware check for invalid selectors, excess privilege in
786 * other selectors, invalid %eip's and invalid %esp's.
788 cs = ucp->uc_mcontext.mc_cs;
789 if (!CS_SECURE(cs)) {
790 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
791 td->td_proc->p_pid, td->td_name, cs);
792 ksiginfo_init_trap(&ksi);
793 ksi.ksi_signo = SIGBUS;
794 ksi.ksi_code = BUS_OBJERR;
795 ksi.ksi_trapno = T_PROTFLT;
796 ksi.ksi_addr = (void *)regs->tf_rip;
797 trapsignal(td, &ksi);
801 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
802 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
803 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
804 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
805 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
806 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
807 regs->tf_rax = ucp->uc_mcontext.mc_eax;
808 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
809 regs->tf_err = ucp->uc_mcontext.mc_err;
810 regs->tf_rip = ucp->uc_mcontext.mc_eip;
812 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
813 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
814 regs->tf_ss = ucp->uc_mcontext.mc_ss;
815 regs->tf_ds = ucp->uc_mcontext.mc_ds;
816 regs->tf_es = ucp->uc_mcontext.mc_es;
817 regs->tf_fs = ucp->uc_mcontext.mc_fs;
818 regs->tf_gs = ucp->uc_mcontext.mc_gs;
820 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
821 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
822 return (EJUSTRETURN);
824 #endif /* COMPAT_FREEBSD4 */
830 freebsd32_sigreturn(td, uap)
832 struct freebsd32_sigreturn_args /* {
833 const struct freebsd32_ucontext *sigcntxp;
836 struct ia32_ucontext uc;
837 struct trapframe *regs;
838 struct ia32_ucontext *ucp;
840 size_t xfpustate_len;
841 int cs, eflags, error, ret;
844 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
849 eflags = ucp->uc_mcontext.mc_eflags;
851 * Don't allow users to change privileged or reserved flags.
853 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
854 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
855 td->td_proc->p_pid, td->td_name, eflags);
860 * Don't allow users to load a valid privileged %cs. Let the
861 * hardware check for invalid selectors, excess privilege in
862 * other selectors, invalid %eip's and invalid %esp's.
864 cs = ucp->uc_mcontext.mc_cs;
865 if (!CS_SECURE(cs)) {
866 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
867 td->td_proc->p_pid, td->td_name, cs);
868 ksiginfo_init_trap(&ksi);
869 ksi.ksi_signo = SIGBUS;
870 ksi.ksi_code = BUS_OBJERR;
871 ksi.ksi_trapno = T_PROTFLT;
872 ksi.ksi_addr = (void *)regs->tf_rip;
873 trapsignal(td, &ksi);
877 if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
878 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
879 if (xfpustate_len > cpu_max_ext_state_size -
880 sizeof(struct savefpu)) {
881 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
882 td->td_proc->p_pid, td->td_name, xfpustate_len);
885 xfpustate = (char *)td->td_md.md_fpu_scratch;
886 error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate),
887 xfpustate, xfpustate_len);
890 "pid %d (%s): sigreturn copying xfpustate failed\n",
891 td->td_proc->p_pid, td->td_name);
898 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
901 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
902 td->td_proc->p_pid, td->td_name, ret);
906 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
907 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
908 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
909 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
910 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
911 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
912 regs->tf_rax = ucp->uc_mcontext.mc_eax;
913 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
914 regs->tf_err = ucp->uc_mcontext.mc_err;
915 regs->tf_rip = ucp->uc_mcontext.mc_eip;
917 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
918 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
919 regs->tf_ss = ucp->uc_mcontext.mc_ss;
920 regs->tf_ds = ucp->uc_mcontext.mc_ds;
921 regs->tf_es = ucp->uc_mcontext.mc_es;
922 regs->tf_fs = ucp->uc_mcontext.mc_fs;
923 regs->tf_gs = ucp->uc_mcontext.mc_gs;
924 regs->tf_flags = TF_HASSEGS;
926 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
927 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
928 return (EJUSTRETURN);
932 * Clear registers on exec
935 ia32_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack)
937 struct trapframe *regs;
939 register_t saved_rflags;
944 if (td->td_proc->p_md.md_ldt != NULL)
952 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
954 saved_rflags = regs->tf_rflags & PSL_T;
955 bzero((char *)regs, sizeof(struct trapframe));
956 regs->tf_rip = imgp->entry_addr;
957 regs->tf_rsp = stack;
958 regs->tf_rflags = PSL_USER | saved_rflags;
959 regs->tf_ss = _udatasel;
960 regs->tf_cs = _ucode32sel;
961 regs->tf_rbx = (register_t)imgp->ps_strings;
962 regs->tf_ds = _udatasel;
963 regs->tf_es = _udatasel;
964 regs->tf_fs = _ufssel;
965 regs->tf_gs = _ugssel;
966 regs->tf_flags = TF_HASSEGS;
968 x86_clear_dbregs(pcb);
972 /* Return via doreti so that we can change to a different %cs */
973 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);