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 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 bzero(&uc, sizeof(uc));
306 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
307 PROC_LOCK(td->td_proc);
308 uc.uc_sigmask = td->td_sigmask;
309 PROC_UNLOCK(td->td_proc);
310 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
312 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
314 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
316 kern_sigprocmask(td, SIG_SETMASK,
317 &uc.uc_sigmask, NULL, 0);
322 return (ret == 0 ? EJUSTRETURN : ret);
326 * Send an interrupt to process.
328 * Stack is set up to allow sigcode stored
329 * at top to call routine, followed by kcall
330 * to sigreturn routine below. After sigreturn
331 * resets the signal mask, the stack, and the
332 * frame pointer, it returns to the user
338 ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
340 struct ia32_sigframe3 sf, *fp;
344 struct trapframe *regs;
350 PROC_LOCK_ASSERT(p, MA_OWNED);
351 sig = ksi->ksi_signo;
353 mtx_assert(&psp->ps_mtx, MA_OWNED);
355 oonstack = sigonstack(regs->tf_rsp);
357 /* Allocate space for the signal handler context. */
358 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
359 SIGISMEMBER(psp->ps_sigonstack, sig)) {
360 fp = (struct ia32_sigframe3 *)((uintptr_t)td->td_sigstk.ss_sp +
361 td->td_sigstk.ss_size - sizeof(sf));
362 td->td_sigstk.ss_flags |= SS_ONSTACK;
364 fp = (struct ia32_sigframe3 *)regs->tf_rsp - 1;
366 /* Build the argument list for the signal handler. */
368 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
369 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
370 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
371 /* Signal handler installed with SA_SIGINFO. */
372 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
373 sf.sf_siginfo.si_signo = sig;
374 sf.sf_siginfo.si_code = ksi->ksi_code;
375 sf.sf_ah = (uintptr_t)catcher;
378 /* Old FreeBSD-style arguments. */
379 sf.sf_arg2 = ksi->ksi_code;
380 sf.sf_addr = (register_t)ksi->ksi_addr;
381 sf.sf_ah = (uintptr_t)catcher;
383 mtx_unlock(&psp->ps_mtx);
386 /* Save most if not all of trap frame. */
387 sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax;
388 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx;
389 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx;
390 sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx;
391 sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi;
392 sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi;
393 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
394 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
395 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
396 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
397 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
398 sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs;
399 sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp;
401 /* Build the signal context to be used by osigreturn(). */
402 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
403 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
404 sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp;
405 sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp;
406 sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip;
407 sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags;
408 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
409 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
412 * Copy the sigframe out to the user's stack.
414 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
416 printf("process %ld has trashed its stack\n", (long)p->p_pid);
422 regs->tf_rsp = (uintptr_t)fp;
423 regs->tf_rip = p->p_sysent->sv_psstrings - sz_ia32_osigcode;
424 regs->tf_rflags &= ~(PSL_T | PSL_D);
425 regs->tf_cs = _ucode32sel;
426 regs->tf_ds = _udatasel;
427 regs->tf_es = _udatasel;
428 regs->tf_fs = _udatasel;
429 regs->tf_ss = _udatasel;
430 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
432 mtx_lock(&psp->ps_mtx);
436 #ifdef COMPAT_FREEBSD4
438 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
440 struct ia32_sigframe4 sf, *sfp;
441 struct siginfo32 siginfo;
445 struct trapframe *regs;
451 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
453 PROC_LOCK_ASSERT(p, MA_OWNED);
454 sig = siginfo.si_signo;
456 mtx_assert(&psp->ps_mtx, MA_OWNED);
458 oonstack = sigonstack(regs->tf_rsp);
460 /* Save user context. */
461 bzero(&sf, sizeof(sf));
462 sf.sf_uc.uc_sigmask = *mask;
463 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
464 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
465 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
466 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
467 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
468 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
469 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
470 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
471 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
472 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
473 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
474 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
475 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
476 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
477 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
478 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
479 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
480 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
481 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
482 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
483 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
484 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
485 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
486 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
487 bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
488 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
489 bzero(sf.sf_uc.uc_mcontext.__spare__,
490 sizeof(sf.sf_uc.uc_mcontext.__spare__));
491 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
493 /* Allocate space for the signal handler context. */
494 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
495 SIGISMEMBER(psp->ps_sigonstack, sig)) {
496 sfp = (struct ia32_sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp +
497 td->td_sigstk.ss_size - sizeof(sf));
499 sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
502 /* Build the argument list for the signal handler. */
504 sf.sf_ucontext = (register_t)&sfp->sf_uc;
505 bzero(&sf.sf_si, sizeof(sf.sf_si));
506 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
507 /* Signal handler installed with SA_SIGINFO. */
508 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
509 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
511 /* Fill in POSIX parts */
513 sf.sf_si.si_signo = sig;
515 /* Old FreeBSD-style arguments. */
516 sf.sf_siginfo = siginfo.si_code;
517 sf.sf_addr = (u_int32_t)siginfo.si_addr;
518 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
520 mtx_unlock(&psp->ps_mtx);
523 * Copy the sigframe out to the user's stack.
525 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
527 printf("process %ld has trashed its stack\n", (long)p->p_pid);
533 regs->tf_rsp = (uintptr_t)sfp;
534 regs->tf_rip = p->p_sysent->sv_sigcode_base + sz_ia32_sigcode -
535 sz_freebsd4_ia32_sigcode;
536 regs->tf_rflags &= ~(PSL_T | PSL_D);
537 regs->tf_cs = _ucode32sel;
538 regs->tf_ss = _udatasel;
539 regs->tf_ds = _udatasel;
540 regs->tf_es = _udatasel;
541 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
542 /* leave user %fs and %gs untouched */
544 mtx_lock(&psp->ps_mtx);
546 #endif /* COMPAT_FREEBSD4 */
549 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
551 struct ia32_sigframe sf, *sfp;
552 struct siginfo32 siginfo;
557 struct trapframe *regs;
563 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
566 PROC_LOCK_ASSERT(p, MA_OWNED);
567 sig = siginfo.si_signo;
569 #ifdef COMPAT_FREEBSD4
570 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
571 freebsd4_ia32_sendsig(catcher, ksi, mask);
576 if (SIGISMEMBER(psp->ps_osigset, sig)) {
577 ia32_osendsig(catcher, ksi, mask);
581 mtx_assert(&psp->ps_mtx, MA_OWNED);
583 oonstack = sigonstack(regs->tf_rsp);
585 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) {
586 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu);
587 xfpusave = __builtin_alloca(xfpusave_len);
593 /* Save user context. */
594 bzero(&sf, sizeof(sf));
595 sf.sf_uc.uc_sigmask = *mask;
596 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
597 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
598 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
599 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
600 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
601 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
602 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
603 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
604 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
605 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
606 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
607 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
608 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
609 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
610 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
611 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
612 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
613 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
614 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
615 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
616 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
617 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
618 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
619 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
620 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
621 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len);
623 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase;
624 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase;
625 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
627 /* Allocate space for the signal handler context. */
628 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
629 SIGISMEMBER(psp->ps_sigonstack, sig))
630 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size;
632 sp = (char *)regs->tf_rsp;
633 if (xfpusave != NULL) {
635 sp = (char *)((unsigned long)sp & ~0x3Ful);
636 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp;
639 /* Align to 16 bytes. */
640 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
643 /* Build the argument list for the signal handler. */
645 sf.sf_ucontext = (register_t)&sfp->sf_uc;
646 bzero(&sf.sf_si, sizeof(sf.sf_si));
647 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
648 /* Signal handler installed with SA_SIGINFO. */
649 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
650 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
652 /* Fill in POSIX parts */
654 sf.sf_si.si_signo = sig;
656 /* Old FreeBSD-style arguments. */
657 sf.sf_siginfo = siginfo.si_code;
658 sf.sf_addr = (u_int32_t)siginfo.si_addr;
659 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
661 mtx_unlock(&psp->ps_mtx);
664 * Copy the sigframe out to the user's stack.
666 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 ||
667 (xfpusave != NULL && copyout(xfpusave,
668 PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len)
671 printf("process %ld has trashed its stack\n", (long)p->p_pid);
677 regs->tf_rsp = (uintptr_t)sfp;
678 regs->tf_rip = p->p_sysent->sv_sigcode_base;
679 regs->tf_rflags &= ~(PSL_T | PSL_D);
680 regs->tf_cs = _ucode32sel;
681 regs->tf_ss = _udatasel;
682 regs->tf_ds = _udatasel;
683 regs->tf_es = _udatasel;
684 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
685 /* XXXKIB leave user %fs and %gs untouched */
687 mtx_lock(&psp->ps_mtx);
691 * System call to cleanup state after a signal
692 * has been taken. Reset signal mask and
693 * stack state from context left by sendsig (above).
694 * Return to previous pc and psl as specified by
695 * context left by sendsig. Check carefully to
696 * make sure that the user has not modified the
697 * state to gain improper privileges.
702 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
704 struct ia32_sigcontext3 sc, *scp;
705 struct trapframe *regs;
710 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
714 eflags = scp->sc_eflags;
715 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
718 if (!CS_SECURE(scp->sc_cs)) {
719 ksiginfo_init_trap(&ksi);
720 ksi.ksi_signo = SIGBUS;
721 ksi.ksi_code = BUS_OBJERR;
722 ksi.ksi_trapno = T_PROTFLT;
723 ksi.ksi_addr = (void *)regs->tf_rip;
724 trapsignal(td, &ksi);
727 regs->tf_ds = scp->sc_ds;
728 regs->tf_es = scp->sc_es;
729 regs->tf_fs = scp->sc_fs;
730 regs->tf_gs = scp->sc_gs;
732 regs->tf_rax = scp->sc_eax;
733 regs->tf_rbx = scp->sc_ebx;
734 regs->tf_rcx = scp->sc_ecx;
735 regs->tf_rdx = scp->sc_edx;
736 regs->tf_rsi = scp->sc_esi;
737 regs->tf_rdi = scp->sc_edi;
738 regs->tf_cs = scp->sc_cs;
739 regs->tf_ss = scp->sc_ss;
740 regs->tf_rbp = scp->sc_ebp;
741 regs->tf_rsp = scp->sc_esp;
742 regs->tf_rip = scp->sc_eip;
743 regs->tf_rflags = eflags;
745 if (scp->sc_onstack & 1)
746 td->td_sigstk.ss_flags |= SS_ONSTACK;
748 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
750 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
752 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
753 return (EJUSTRETURN);
757 #ifdef COMPAT_FREEBSD4
762 freebsd4_freebsd32_sigreturn(td, uap)
764 struct freebsd4_freebsd32_sigreturn_args /* {
765 const struct freebsd4_freebsd32_ucontext *sigcntxp;
768 struct ia32_ucontext4 uc;
769 struct trapframe *regs;
770 struct ia32_ucontext4 *ucp;
771 int cs, eflags, error;
774 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
779 eflags = ucp->uc_mcontext.mc_eflags;
781 * Don't allow users to change privileged or reserved flags.
783 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
784 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
785 td->td_proc->p_pid, td->td_name, eflags);
790 * Don't allow users to load a valid privileged %cs. Let the
791 * hardware check for invalid selectors, excess privilege in
792 * other selectors, invalid %eip's and invalid %esp's.
794 cs = ucp->uc_mcontext.mc_cs;
795 if (!CS_SECURE(cs)) {
796 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
797 td->td_proc->p_pid, td->td_name, cs);
798 ksiginfo_init_trap(&ksi);
799 ksi.ksi_signo = SIGBUS;
800 ksi.ksi_code = BUS_OBJERR;
801 ksi.ksi_trapno = T_PROTFLT;
802 ksi.ksi_addr = (void *)regs->tf_rip;
803 trapsignal(td, &ksi);
807 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
808 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
809 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
810 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
811 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
812 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
813 regs->tf_rax = ucp->uc_mcontext.mc_eax;
814 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
815 regs->tf_err = ucp->uc_mcontext.mc_err;
816 regs->tf_rip = ucp->uc_mcontext.mc_eip;
818 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
819 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
820 regs->tf_ss = ucp->uc_mcontext.mc_ss;
821 regs->tf_ds = ucp->uc_mcontext.mc_ds;
822 regs->tf_es = ucp->uc_mcontext.mc_es;
823 regs->tf_fs = ucp->uc_mcontext.mc_fs;
824 regs->tf_gs = ucp->uc_mcontext.mc_gs;
826 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
827 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
828 return (EJUSTRETURN);
830 #endif /* COMPAT_FREEBSD4 */
836 freebsd32_sigreturn(td, uap)
838 struct freebsd32_sigreturn_args /* {
839 const struct freebsd32_ucontext *sigcntxp;
842 struct ia32_ucontext uc;
843 struct trapframe *regs;
844 struct ia32_ucontext *ucp;
846 size_t xfpustate_len;
847 int cs, eflags, error, ret;
850 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
855 eflags = ucp->uc_mcontext.mc_eflags;
857 * Don't allow users to change privileged or reserved flags.
859 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
860 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
861 td->td_proc->p_pid, td->td_name, eflags);
866 * Don't allow users to load a valid privileged %cs. Let the
867 * hardware check for invalid selectors, excess privilege in
868 * other selectors, invalid %eip's and invalid %esp's.
870 cs = ucp->uc_mcontext.mc_cs;
871 if (!CS_SECURE(cs)) {
872 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
873 td->td_proc->p_pid, td->td_name, cs);
874 ksiginfo_init_trap(&ksi);
875 ksi.ksi_signo = SIGBUS;
876 ksi.ksi_code = BUS_OBJERR;
877 ksi.ksi_trapno = T_PROTFLT;
878 ksi.ksi_addr = (void *)regs->tf_rip;
879 trapsignal(td, &ksi);
883 if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
884 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
885 if (xfpustate_len > cpu_max_ext_state_size -
886 sizeof(struct savefpu)) {
887 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
888 td->td_proc->p_pid, td->td_name, xfpustate_len);
891 xfpustate = __builtin_alloca(xfpustate_len);
892 error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate),
893 xfpustate, xfpustate_len);
896 "pid %d (%s): sigreturn copying xfpustate failed\n",
897 td->td_proc->p_pid, td->td_name);
904 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
907 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
908 td->td_proc->p_pid, td->td_name, ret);
912 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
913 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
914 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
915 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
916 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
917 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
918 regs->tf_rax = ucp->uc_mcontext.mc_eax;
919 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
920 regs->tf_err = ucp->uc_mcontext.mc_err;
921 regs->tf_rip = ucp->uc_mcontext.mc_eip;
923 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
924 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
925 regs->tf_ss = ucp->uc_mcontext.mc_ss;
926 regs->tf_ds = ucp->uc_mcontext.mc_ds;
927 regs->tf_es = ucp->uc_mcontext.mc_es;
928 regs->tf_fs = ucp->uc_mcontext.mc_fs;
929 regs->tf_gs = ucp->uc_mcontext.mc_gs;
930 regs->tf_flags = TF_HASSEGS;
932 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
933 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
934 return (EJUSTRETURN);
938 * Clear registers on exec
941 ia32_setregs(struct thread *td, struct image_params *imgp, u_long stack)
943 struct trapframe *regs;
945 register_t saved_rflags;
950 if (td->td_proc->p_md.md_ldt != NULL)
958 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
960 saved_rflags = regs->tf_rflags & PSL_T;
961 bzero((char *)regs, sizeof(struct trapframe));
962 regs->tf_rip = imgp->entry_addr;
963 regs->tf_rsp = stack;
964 regs->tf_rflags = PSL_USER | saved_rflags;
965 regs->tf_ss = _udatasel;
966 regs->tf_cs = _ucode32sel;
967 regs->tf_rbx = imgp->ps_strings;
968 regs->tf_ds = _udatasel;
969 regs->tf_es = _udatasel;
970 regs->tf_fs = _ufssel;
971 regs->tf_gs = _ugssel;
972 regs->tf_flags = TF_HASSEGS;
976 /* Return via doreti so that we can change to a different %cs */
977 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);