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 "opt_compat.h"
41 #include <sys/param.h>
43 #include <sys/fcntl.h>
44 #include <sys/imgact.h>
45 #include <sys/kernel.h>
47 #include <sys/malloc.h>
48 #include <sys/mutex.h>
50 #include <sys/namei.h>
51 #include <sys/pioctl.h>
53 #include <sys/procfs.h>
54 #include <sys/resourcevar.h>
55 #include <sys/systm.h>
56 #include <sys/signalvar.h>
59 #include <sys/syscall.h>
60 #include <sys/syscallsubr.h>
61 #include <sys/sysctl.h>
62 #include <sys/sysent.h>
63 #include <sys/vnode.h>
66 #include <vm/vm_kern.h>
67 #include <vm/vm_param.h>
69 #include <vm/vm_map.h>
70 #include <vm/vm_object.h>
71 #include <vm/vm_extern.h>
73 #include <compat/freebsd32/freebsd32_signal.h>
74 #include <compat/freebsd32/freebsd32_util.h>
75 #include <compat/freebsd32/freebsd32_proto.h>
76 #include <compat/freebsd32/freebsd32.h>
77 #include <compat/ia32/ia32_signal.h>
78 #include <machine/psl.h>
79 #include <machine/segments.h>
80 #include <machine/specialreg.h>
81 #include <machine/frame.h>
82 #include <machine/md_var.h>
83 #include <machine/pcb.h>
84 #include <machine/cpufunc.h>
86 #ifdef COMPAT_FREEBSD4
87 static void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
90 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
91 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
94 ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
95 char *xfpusave, size_t xfpusave_len)
100 * XXX Format of 64bit and 32bit FXSAVE areas differs. FXSAVE
101 * in 32bit mode saves %cs and %ds, while on 64bit it saves
102 * 64bit instruction and data pointers. Ignore the difference
103 * for now, it should be irrelevant for most applications.
105 mcp->mc_ownedfp = fpugetregs(td);
106 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0],
107 sizeof(mcp->mc_fpstate));
108 mcp->mc_fpformat = fpuformat();
109 if (!use_xsave || xfpusave_len == 0)
111 max_len = cpu_max_ext_state_size - sizeof(struct savefpu);
115 bzero(xfpusave + max_len, len - max_len);
117 mcp->mc_flags |= _MC_IA32_HASFPXSTATE;
118 mcp->mc_xfpustate_len = len;
119 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len);
123 ia32_set_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
124 char *xfpustate, size_t xfpustate_len)
128 if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
130 else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
132 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) {
133 /* We don't care what state is left in the FPU or PCB. */
136 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
137 mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
138 error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate,
139 xfpustate, xfpustate_len);
146 * Get machine context.
149 ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
152 struct trapframe *tp;
157 PROC_LOCK(curthread->td_proc);
158 mcp->mc_onstack = sigonstack(tp->tf_rsp);
159 PROC_UNLOCK(curthread->td_proc);
160 /* Entry into kernel always sets TF_HASSEGS */
161 mcp->mc_gs = tp->tf_gs;
162 mcp->mc_fs = tp->tf_fs;
163 mcp->mc_es = tp->tf_es;
164 mcp->mc_ds = tp->tf_ds;
165 mcp->mc_edi = tp->tf_rdi;
166 mcp->mc_esi = tp->tf_rsi;
167 mcp->mc_ebp = tp->tf_rbp;
168 mcp->mc_isp = tp->tf_rsp;
169 mcp->mc_eflags = tp->tf_rflags;
170 if (flags & GET_MC_CLEAR_RET) {
173 mcp->mc_eflags &= ~PSL_C;
175 mcp->mc_eax = tp->tf_rax;
176 mcp->mc_edx = tp->tf_rdx;
178 mcp->mc_ebx = tp->tf_rbx;
179 mcp->mc_ecx = tp->tf_rcx;
180 mcp->mc_eip = tp->tf_rip;
181 mcp->mc_cs = tp->tf_cs;
182 mcp->mc_esp = tp->tf_rsp;
183 mcp->mc_ss = tp->tf_ss;
184 mcp->mc_len = sizeof(*mcp);
185 mcp->mc_flags = tp->tf_flags;
186 ia32_get_fpcontext(td, mcp, NULL, 0);
187 mcp->mc_fsbase = pcb->pcb_fsbase;
188 mcp->mc_gsbase = pcb->pcb_gsbase;
189 mcp->mc_xfpustate = 0;
190 mcp->mc_xfpustate_len = 0;
191 bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2));
196 * Set machine context.
198 * However, we don't set any but the user modifiable flags, and we won't
199 * touch the cs selector.
202 ia32_set_mcontext(struct thread *td, struct ia32_mcontext *mcp)
204 struct trapframe *tp;
210 if (mcp->mc_len != sizeof(*mcp))
212 rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
213 (tp->tf_rflags & ~PSL_USERCHANGE);
214 if (mcp->mc_flags & _MC_IA32_HASFPXSTATE) {
215 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size -
216 sizeof(struct savefpu))
218 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len);
219 ret = copyin(PTRIN(mcp->mc_xfpustate), xfpustate,
220 mcp->mc_xfpustate_len);
225 ret = ia32_set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
228 tp->tf_gs = mcp->mc_gs;
229 tp->tf_fs = mcp->mc_fs;
230 tp->tf_es = mcp->mc_es;
231 tp->tf_ds = mcp->mc_ds;
232 tp->tf_flags = TF_HASSEGS;
233 tp->tf_rdi = mcp->mc_edi;
234 tp->tf_rsi = mcp->mc_esi;
235 tp->tf_rbp = mcp->mc_ebp;
236 tp->tf_rbx = mcp->mc_ebx;
237 tp->tf_rdx = mcp->mc_edx;
238 tp->tf_rcx = mcp->mc_ecx;
239 tp->tf_rax = mcp->mc_eax;
241 tp->tf_rip = mcp->mc_eip;
242 tp->tf_rflags = rflags;
243 tp->tf_rsp = mcp->mc_esp;
244 tp->tf_ss = mcp->mc_ss;
245 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
250 * The first two fields of a ucontext_t are the signal mask and
251 * the machine context. The next field is uc_link; we want to
252 * avoid destroying the link when copying out contexts.
254 #define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link)
257 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
259 struct ia32_ucontext uc;
262 if (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 bzero(&uc.__spare__, sizeof(uc.__spare__));
270 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
276 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
278 struct ia32_ucontext uc;
281 if (uap->ucp == NULL)
284 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
286 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
288 kern_sigprocmask(td, SIG_SETMASK,
289 &uc.uc_sigmask, NULL, 0);
293 return (ret == 0 ? EJUSTRETURN : ret);
297 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
299 struct ia32_ucontext uc;
302 if (uap->oucp == NULL || uap->ucp == NULL)
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 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
369 /* Signal handler installed with SA_SIGINFO. */
370 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
371 sf.sf_siginfo.si_signo = sig;
372 sf.sf_siginfo.si_code = ksi->ksi_code;
373 sf.sf_ah = (uintptr_t)catcher;
375 /* Old FreeBSD-style arguments. */
376 sf.sf_arg2 = ksi->ksi_code;
377 sf.sf_addr = (register_t)ksi->ksi_addr;
378 sf.sf_ah = (uintptr_t)catcher;
380 mtx_unlock(&psp->ps_mtx);
383 /* Save most if not all of trap frame. */
384 sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax;
385 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx;
386 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx;
387 sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx;
388 sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi;
389 sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi;
390 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
391 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
392 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
393 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
394 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
395 sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs;
396 sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp;
398 /* Build the signal context to be used by osigreturn(). */
399 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
400 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
401 sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp;
402 sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp;
403 sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip;
404 sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags;
405 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
406 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
409 * Copy the sigframe out to the user's stack.
411 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
413 printf("process %ld has trashed its stack\n", (long)p->p_pid);
419 regs->tf_rsp = (uintptr_t)fp;
420 regs->tf_rip = p->p_sysent->sv_psstrings - sz_ia32_osigcode;
421 regs->tf_rflags &= ~(PSL_T | PSL_D);
422 regs->tf_cs = _ucode32sel;
423 regs->tf_ds = _udatasel;
424 regs->tf_es = _udatasel;
425 regs->tf_fs = _udatasel;
426 regs->tf_ss = _udatasel;
427 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
429 mtx_lock(&psp->ps_mtx);
433 #ifdef COMPAT_FREEBSD4
435 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
437 struct ia32_sigframe4 sf, *sfp;
438 struct siginfo32 siginfo;
442 struct trapframe *regs;
448 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
450 PROC_LOCK_ASSERT(p, MA_OWNED);
451 sig = siginfo.si_signo;
453 mtx_assert(&psp->ps_mtx, MA_OWNED);
455 oonstack = sigonstack(regs->tf_rsp);
457 /* Save user context. */
458 bzero(&sf, sizeof(sf));
459 sf.sf_uc.uc_sigmask = *mask;
460 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
461 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
462 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
463 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
464 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
465 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
466 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
467 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
468 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
469 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
470 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
471 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
472 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
473 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
474 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
475 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
476 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
477 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
478 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
479 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
480 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
481 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
482 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
483 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
484 bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
485 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
486 bzero(sf.sf_uc.uc_mcontext.__spare__,
487 sizeof(sf.sf_uc.uc_mcontext.__spare__));
488 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
490 /* Allocate space for the signal handler context. */
491 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
492 SIGISMEMBER(psp->ps_sigonstack, sig)) {
493 sfp = (struct ia32_sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
494 td->td_sigstk.ss_size - sizeof(sf));
496 sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
499 /* Build the argument list for the signal handler. */
501 sf.sf_ucontext = (register_t)&sfp->sf_uc;
502 bzero(&sf.sf_si, sizeof(sf.sf_si));
503 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
504 /* Signal handler installed with SA_SIGINFO. */
505 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
506 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
508 /* Fill in POSIX parts */
510 sf.sf_si.si_signo = sig;
512 /* Old FreeBSD-style arguments. */
513 sf.sf_siginfo = siginfo.si_code;
514 sf.sf_addr = (u_int32_t)siginfo.si_addr;
515 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
517 mtx_unlock(&psp->ps_mtx);
520 * Copy the sigframe out to the user's stack.
522 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
524 printf("process %ld has trashed its stack\n", (long)p->p_pid);
530 regs->tf_rsp = (uintptr_t)sfp;
531 regs->tf_rip = p->p_sysent->sv_sigcode_base + sz_ia32_sigcode -
532 sz_freebsd4_ia32_sigcode;
533 regs->tf_rflags &= ~(PSL_T | PSL_D);
534 regs->tf_cs = _ucode32sel;
535 regs->tf_ss = _udatasel;
536 regs->tf_ds = _udatasel;
537 regs->tf_es = _udatasel;
538 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
539 /* leave user %fs and %gs untouched */
541 mtx_lock(&psp->ps_mtx);
543 #endif /* COMPAT_FREEBSD4 */
546 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
548 struct ia32_sigframe sf, *sfp;
549 struct siginfo32 siginfo;
554 struct trapframe *regs;
560 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
563 PROC_LOCK_ASSERT(p, MA_OWNED);
564 sig = siginfo.si_signo;
566 #ifdef COMPAT_FREEBSD4
567 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
568 freebsd4_ia32_sendsig(catcher, ksi, mask);
573 if (SIGISMEMBER(psp->ps_osigset, sig)) {
574 ia32_osendsig(catcher, ksi, mask);
578 mtx_assert(&psp->ps_mtx, MA_OWNED);
580 oonstack = sigonstack(regs->tf_rsp);
582 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
583 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
584 xfpusave = __builtin_alloca(xfpusave_len);
590 /* Save user context. */
591 bzero(&sf, sizeof(sf));
592 sf.sf_uc.uc_sigmask = *mask;
593 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
594 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
595 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
596 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
597 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
598 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
599 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
600 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
601 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
602 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
603 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
604 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
605 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
606 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
607 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
608 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
609 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
610 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
611 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
612 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
613 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
614 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
615 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
616 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
617 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
618 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
620 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
621 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
622 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
624 /* Allocate space for the signal handler context. */
625 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
626 SIGISMEMBER(psp->ps_sigonstack, sig))
627 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
629 sp = (char *)regs->tf_rsp;
630 if (xfpusave != NULL) {
632 sp = (char *)((unsigned long)sp & ~0x3Ful);
633 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
636 /* Align to 16 bytes. */
637 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
640 /* Build the argument list for the signal handler. */
642 sf.sf_ucontext = (register_t)&sfp->sf_uc;
643 bzero(&sf.sf_si, sizeof(sf.sf_si));
644 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
645 /* Signal handler installed with SA_SIGINFO. */
646 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
647 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
649 /* Fill in POSIX parts */
651 sf.sf_si.si_signo = sig;
653 /* Old FreeBSD-style arguments. */
654 sf.sf_siginfo = siginfo.si_code;
655 sf.sf_addr = (u_int32_t)siginfo.si_addr;
656 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
658 mtx_unlock(&psp->ps_mtx);
661 * Copy the sigframe out to the user's stack.
663 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
664 (xfpusave != NULL && copyout(xfpusave,
665 PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len)
668 printf("process %ld has trashed its stack\n", (long)p->p_pid);
674 regs->tf_rsp = (uintptr_t)sfp;
675 regs->tf_rip = p->p_sysent->sv_sigcode_base;
676 regs->tf_rflags &= ~(PSL_T | PSL_D);
677 regs->tf_cs = _ucode32sel;
678 regs->tf_ss = _udatasel;
679 regs->tf_ds = _udatasel;
680 regs->tf_es = _udatasel;
681 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
682 /* XXXKIB leave user %fs and %gs untouched */
684 mtx_lock(&psp->ps_mtx);
688 * System call to cleanup state after a signal
689 * has been taken. Reset signal mask and
690 * stack state from context left by sendsig (above).
691 * Return to previous pc and psl as specified by
692 * context left by sendsig. Check carefully to
693 * make sure that the user has not modified the
694 * state to gain improper privileges.
699 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
701 struct ia32_sigcontext3 sc, *scp;
702 struct trapframe *regs;
707 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
711 eflags = scp->sc_eflags;
712 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
715 if (!CS_SECURE(scp->sc_cs)) {
716 ksiginfo_init_trap(&ksi);
717 ksi.ksi_signo = SIGBUS;
718 ksi.ksi_code = BUS_OBJERR;
719 ksi.ksi_trapno = T_PROTFLT;
720 ksi.ksi_addr = (void *)regs->tf_rip;
721 trapsignal(td, &ksi);
724 regs->tf_ds = scp->sc_ds;
725 regs->tf_es = scp->sc_es;
726 regs->tf_fs = scp->sc_fs;
727 regs->tf_gs = scp->sc_gs;
729 regs->tf_rax = scp->sc_eax;
730 regs->tf_rbx = scp->sc_ebx;
731 regs->tf_rcx = scp->sc_ecx;
732 regs->tf_rdx = scp->sc_edx;
733 regs->tf_rsi = scp->sc_esi;
734 regs->tf_rdi = scp->sc_edi;
735 regs->tf_cs = scp->sc_cs;
736 regs->tf_ss = scp->sc_ss;
737 regs->tf_rbp = scp->sc_ebp;
738 regs->tf_rsp = scp->sc_esp;
739 regs->tf_rip = scp->sc_eip;
740 regs->tf_rflags = eflags;
742 if (scp->sc_onstack & 1)
743 td->td_sigstk.ss_flags |= SS_ONSTACK;
745 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
747 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
749 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
750 return (EJUSTRETURN);
754 #ifdef COMPAT_FREEBSD4
759 freebsd4_freebsd32_sigreturn(td, uap)
761 struct freebsd4_freebsd32_sigreturn_args /* {
762 const struct freebsd4_freebsd32_ucontext *sigcntxp;
765 struct ia32_ucontext4 uc;
766 struct trapframe *regs;
767 struct ia32_ucontext4 *ucp;
768 int cs, eflags, error;
771 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
776 eflags = ucp->uc_mcontext.mc_eflags;
778 * Don't allow users to change privileged or reserved flags.
780 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
781 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
782 td->td_proc->p_pid, td->td_name, eflags);
787 * Don't allow users to load a valid privileged %cs. Let the
788 * hardware check for invalid selectors, excess privilege in
789 * other selectors, invalid %eip's and invalid %esp's.
791 cs = ucp->uc_mcontext.mc_cs;
792 if (!CS_SECURE(cs)) {
793 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
794 td->td_proc->p_pid, td->td_name, cs);
795 ksiginfo_init_trap(&ksi);
796 ksi.ksi_signo = SIGBUS;
797 ksi.ksi_code = BUS_OBJERR;
798 ksi.ksi_trapno = T_PROTFLT;
799 ksi.ksi_addr = (void *)regs->tf_rip;
800 trapsignal(td, &ksi);
804 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
805 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
806 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
807 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
808 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
809 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
810 regs->tf_rax = ucp->uc_mcontext.mc_eax;
811 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
812 regs->tf_err = ucp->uc_mcontext.mc_err;
813 regs->tf_rip = ucp->uc_mcontext.mc_eip;
815 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
816 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
817 regs->tf_ss = ucp->uc_mcontext.mc_ss;
818 regs->tf_ds = ucp->uc_mcontext.mc_ds;
819 regs->tf_es = ucp->uc_mcontext.mc_es;
820 regs->tf_fs = ucp->uc_mcontext.mc_fs;
821 regs->tf_gs = ucp->uc_mcontext.mc_gs;
823 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
824 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
825 return (EJUSTRETURN);
827 #endif /* COMPAT_FREEBSD4 */
833 freebsd32_sigreturn(td, uap)
835 struct freebsd32_sigreturn_args /* {
836 const struct freebsd32_ucontext *sigcntxp;
839 struct ia32_ucontext uc;
840 struct trapframe *regs;
841 struct ia32_ucontext *ucp;
843 size_t xfpustate_len;
844 int cs, eflags, error, ret;
847 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
852 eflags = ucp->uc_mcontext.mc_eflags;
854 * Don't allow users to change privileged or reserved flags.
856 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
857 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
858 td->td_proc->p_pid, td->td_name, eflags);
863 * Don't allow users to load a valid privileged %cs. Let the
864 * hardware check for invalid selectors, excess privilege in
865 * other selectors, invalid %eip's and invalid %esp's.
867 cs = ucp->uc_mcontext.mc_cs;
868 if (!CS_SECURE(cs)) {
869 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
870 td->td_proc->p_pid, td->td_name, cs);
871 ksiginfo_init_trap(&ksi);
872 ksi.ksi_signo = SIGBUS;
873 ksi.ksi_code = BUS_OBJERR;
874 ksi.ksi_trapno = T_PROTFLT;
875 ksi.ksi_addr = (void *)regs->tf_rip;
876 trapsignal(td, &ksi);
880 if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
881 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
882 if (xfpustate_len > cpu_max_ext_state_size -
883 sizeof(struct savefpu)) {
884 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
885 td->td_proc->p_pid, td->td_name, xfpustate_len);
888 xfpustate = __builtin_alloca(xfpustate_len);
889 error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate),
890 xfpustate, xfpustate_len);
893 "pid %d (%s): sigreturn copying xfpustate failed\n",
894 td->td_proc->p_pid, td->td_name);
901 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
904 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
905 td->td_proc->p_pid, td->td_name, ret);
909 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
910 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
911 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
912 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
913 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
914 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
915 regs->tf_rax = ucp->uc_mcontext.mc_eax;
916 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
917 regs->tf_err = ucp->uc_mcontext.mc_err;
918 regs->tf_rip = ucp->uc_mcontext.mc_eip;
920 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
921 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
922 regs->tf_ss = ucp->uc_mcontext.mc_ss;
923 regs->tf_ds = ucp->uc_mcontext.mc_ds;
924 regs->tf_es = ucp->uc_mcontext.mc_es;
925 regs->tf_fs = ucp->uc_mcontext.mc_fs;
926 regs->tf_gs = ucp->uc_mcontext.mc_gs;
927 regs->tf_flags = TF_HASSEGS;
929 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
930 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
931 return (EJUSTRETURN);
935 * Clear registers on exec
938 ia32_setregs(struct thread *td, struct image_params *imgp, u_long stack)
940 struct trapframe *regs = td->td_frame;
941 struct pcb *pcb = td->td_pcb;
943 if (td->td_proc->p_md.md_ldt != NULL)
951 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
953 bzero((char *)regs, sizeof(struct trapframe));
954 regs->tf_rip = imgp->entry_addr;
955 regs->tf_rsp = stack;
956 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
957 regs->tf_ss = _udatasel;
958 regs->tf_cs = _ucode32sel;
959 regs->tf_rbx = imgp->ps_strings;
960 regs->tf_ds = _udatasel;
961 regs->tf_es = _udatasel;
962 regs->tf_fs = _ufssel;
963 regs->tf_gs = _ugssel;
964 regs->tf_flags = TF_HASSEGS;
968 /* Return via doreti so that we can change to a different %cs */
969 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);