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 #include "vdso_ia32_offsets.h"
86 extern const char _binary_elf_vdso32_so_1_start[];
87 extern const char _binary_elf_vdso32_so_1_end[];
88 extern char _binary_elf_vdso32_so_1_size;
90 #ifdef COMPAT_FREEBSD4
91 static void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
95 ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp,
96 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 (xfpusave == NULL)
110 if (!use_xsave || cpu_max_ext_state_size <= sizeof(struct savefpu)) {
114 mcp->mc_flags |= _MC_IA32_HASFPXSTATE;
115 *xfpusave_len = mcp->mc_xfpustate_len =
116 cpu_max_ext_state_size - sizeof(struct savefpu);
117 *xfpusave = (char *)(get_pcb_user_save_td(td) + 1);
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 = (char *)fpu_save_area_alloc();
218 ret = copyin(PTRIN(mcp->mc_xfpustate), xfpustate,
219 mcp->mc_xfpustate_len);
221 fpu_save_area_free((struct savefpu *)xfpustate);
226 ret = ia32_set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len);
227 fpu_save_area_free((struct savefpu *)xfpustate);
230 tp->tf_gs = mcp->mc_gs;
231 tp->tf_fs = mcp->mc_fs;
232 tp->tf_es = mcp->mc_es;
233 tp->tf_ds = mcp->mc_ds;
234 tp->tf_flags = TF_HASSEGS;
235 tp->tf_rdi = mcp->mc_edi;
236 tp->tf_rsi = mcp->mc_esi;
237 tp->tf_rbp = mcp->mc_ebp;
238 tp->tf_rbx = mcp->mc_ebx;
239 tp->tf_rdx = mcp->mc_edx;
240 tp->tf_rcx = mcp->mc_ecx;
241 tp->tf_rax = mcp->mc_eax;
243 tp->tf_rip = mcp->mc_eip;
244 tp->tf_rflags = rflags;
245 tp->tf_rsp = mcp->mc_esp;
246 tp->tf_ss = mcp->mc_ss;
247 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
252 * The first two fields of a ucontext_t are the signal mask and
253 * the machine context. The next field is uc_link; we want to
254 * avoid destroying the link when copying out contexts.
256 #define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link)
259 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
261 struct ia32_ucontext uc;
264 if (uap->ucp == NULL)
267 bzero(&uc, sizeof(uc));
268 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
269 PROC_LOCK(td->td_proc);
270 uc.uc_sigmask = td->td_sigmask;
271 PROC_UNLOCK(td->td_proc);
272 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
278 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
280 struct ia32_ucontext uc;
283 if (uap->ucp == NULL)
286 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
288 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
290 kern_sigprocmask(td, SIG_SETMASK,
291 &uc.uc_sigmask, NULL, 0);
295 return (ret == 0 ? EJUSTRETURN : ret);
299 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
301 struct ia32_ucontext uc;
304 if (uap->oucp == NULL || uap->ucp == NULL)
307 bzero(&uc, sizeof(uc));
308 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
309 PROC_LOCK(td->td_proc);
310 uc.uc_sigmask = td->td_sigmask;
311 PROC_UNLOCK(td->td_proc);
312 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
314 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
316 ret = ia32_set_mcontext(td, &uc.uc_mcontext);
318 kern_sigprocmask(td, SIG_SETMASK,
319 &uc.uc_sigmask, NULL, 0);
324 return (ret == 0 ? EJUSTRETURN : ret);
328 * Send an interrupt to process.
330 * Stack is set up to allow sigcode stored
331 * at top to call routine, followed by kcall
332 * to sigreturn routine below. After sigreturn
333 * resets the signal mask, the stack, and the
334 * frame pointer, it returns to the user
340 ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
342 struct ia32_osigframe sf, *fp;
346 struct trapframe *regs;
352 PROC_LOCK_ASSERT(p, MA_OWNED);
353 sig = ksi->ksi_signo;
355 mtx_assert(&psp->ps_mtx, MA_OWNED);
357 oonstack = sigonstack(regs->tf_rsp);
359 /* Allocate space for the signal handler context. */
360 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
361 SIGISMEMBER(psp->ps_sigonstack, sig)) {
362 fp = (struct ia32_osigframe *)((uintptr_t)td->td_sigstk.ss_sp +
363 td->td_sigstk.ss_size - sizeof(sf));
364 td->td_sigstk.ss_flags |= SS_ONSTACK;
366 fp = (struct ia32_osigframe *)regs->tf_rsp - 1;
368 /* Build the argument list for the signal handler. */
370 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc;
371 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo));
372 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
373 /* Signal handler installed with SA_SIGINFO. */
374 sf.sf_arg2 = (register_t)&fp->sf_siginfo;
375 sf.sf_siginfo.si_signo = sig;
376 sf.sf_siginfo.si_code = ksi->ksi_code;
377 sf.sf_ah = (uintptr_t)catcher;
380 /* Old FreeBSD-style arguments. */
381 sf.sf_arg2 = ksi->ksi_code;
382 sf.sf_addr = (register_t)ksi->ksi_addr;
383 sf.sf_ah = (uintptr_t)catcher;
385 mtx_unlock(&psp->ps_mtx);
388 /* Save most if not all of trap frame. */
389 sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax;
390 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx;
391 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx;
392 sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx;
393 sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi;
394 sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi;
395 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs;
396 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds;
397 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss;
398 sf.sf_siginfo.si_sc.sc_es = regs->tf_es;
399 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs;
400 sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs;
401 sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp;
403 /* Build the signal context to be used by osigreturn(). */
404 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0;
405 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask);
406 sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp;
407 sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp;
408 sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip;
409 sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags;
410 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno;
411 sf.sf_siginfo.si_sc.sc_err = regs->tf_err;
414 * Copy the sigframe out to the user's stack.
416 if (copyout(&sf, fp, sizeof(*fp)) != 0) {
418 printf("process %ld has trashed its stack\n", (long)p->p_pid);
424 regs->tf_rsp = (uintptr_t)fp;
425 regs->tf_rip = PROC_PS_STRINGS(p) -
426 (_binary_elf_vdso32_so_1_end - _binary_elf_vdso32_so_1_start) +
427 VDSO_IA32_OSIGCODE_OFFSET;
428 regs->tf_rflags &= ~(PSL_T | PSL_D);
429 regs->tf_cs = _ucode32sel;
430 regs->tf_ds = _udatasel;
431 regs->tf_es = _udatasel;
432 regs->tf_fs = _udatasel;
433 regs->tf_ss = _udatasel;
434 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
436 mtx_lock(&psp->ps_mtx);
440 #ifdef COMPAT_FREEBSD4
442 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
444 struct ia32_freebsd4_sigframe sf, *sfp;
445 struct siginfo32 siginfo;
449 struct trapframe *regs;
455 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
457 PROC_LOCK_ASSERT(p, MA_OWNED);
458 sig = siginfo.si_signo;
460 mtx_assert(&psp->ps_mtx, MA_OWNED);
462 oonstack = sigonstack(regs->tf_rsp);
464 /* Save user context. */
465 bzero(&sf, sizeof(sf));
466 sf.sf_uc.uc_sigmask = *mask;
467 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
468 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
469 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
470 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
471 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
472 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
473 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
474 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
475 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
476 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
477 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
478 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
479 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
480 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
481 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
482 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
483 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
484 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
485 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
486 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
487 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds;
488 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es;
489 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs;
490 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs;
491 bzero(sf.sf_uc.uc_mcontext.mc_fpregs,
492 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs));
493 bzero(sf.sf_uc.uc_mcontext.__spare__,
494 sizeof(sf.sf_uc.uc_mcontext.__spare__));
495 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__));
497 /* Allocate space for the signal handler context. */
498 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
499 SIGISMEMBER(psp->ps_sigonstack, sig)) {
500 sfp = (struct ia32_freebsd4_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
501 td->td_sigstk.ss_size - sizeof(sf));
503 sfp = (struct ia32_freebsd4_sigframe *)regs->tf_rsp - 1;
506 /* Build the argument list for the signal handler. */
508 sf.sf_ucontext = (register_t)&sfp->sf_uc;
509 bzero(&sf.sf_si, sizeof(sf.sf_si));
510 if (SIGISMEMBER(psp->ps_siginfo, sig)) {
511 /* Signal handler installed with SA_SIGINFO. */
512 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
513 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
515 /* Fill in POSIX parts */
517 sf.sf_si.si_signo = sig;
519 /* Old FreeBSD-style arguments. */
520 sf.sf_siginfo = siginfo.si_code;
521 sf.sf_addr = (u_int32_t)siginfo.si_addr;
522 sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
524 mtx_unlock(&psp->ps_mtx);
527 * Copy the sigframe out to the user's stack.
529 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
531 printf("process %ld has trashed its stack\n", (long)p->p_pid);
537 regs->tf_rsp = (uintptr_t)sfp;
538 regs->tf_rip = PROC_SIGCODE(p) +
539 VDSO_FREEBSD4_IA32_SIGCODE_OFFSET - VDSO_IA32_SIGCODE_OFFSET;
540 regs->tf_rflags &= ~(PSL_T | PSL_D);
541 regs->tf_cs = _ucode32sel;
542 regs->tf_ss = _udatasel;
543 regs->tf_ds = _udatasel;
544 regs->tf_es = _udatasel;
545 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
546 /* leave user %fs and %gs untouched */
548 mtx_lock(&psp->ps_mtx);
550 #endif /* COMPAT_FREEBSD4 */
553 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
555 struct ia32_sigframe sf, *sfp;
556 struct siginfo32 siginfo;
561 struct trapframe *regs;
567 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo);
570 PROC_LOCK_ASSERT(p, MA_OWNED);
571 sig = siginfo.si_signo;
573 #ifdef COMPAT_FREEBSD4
574 if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
575 freebsd4_ia32_sendsig(catcher, ksi, mask);
580 if (SIGISMEMBER(psp->ps_osigset, sig)) {
581 ia32_osendsig(catcher, ksi, mask);
585 mtx_assert(&psp->ps_mtx, MA_OWNED);
587 oonstack = sigonstack(regs->tf_rsp);
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);
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);
672 regs->tf_rsp = (uintptr_t)sfp;
673 regs->tf_rip = PROC_SIGCODE(p);
674 regs->tf_rflags &= ~(PSL_T | PSL_D);
675 regs->tf_cs = _ucode32sel;
676 regs->tf_ss = _udatasel;
677 regs->tf_ds = _udatasel;
678 regs->tf_es = _udatasel;
679 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
680 /* XXXKIB leave user %fs and %gs untouched */
682 mtx_lock(&psp->ps_mtx);
686 * System call to cleanup state after a signal
687 * has been taken. Reset signal mask and
688 * stack state from context left by sendsig (above).
689 * Return to previous pc and psl as specified by
690 * context left by sendsig. Check carefully to
691 * make sure that the user has not modified the
692 * state to gain improper privileges.
697 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap)
699 struct ia32_osigcontext sc, *scp;
700 struct trapframe *regs;
705 error = copyin(uap->sigcntxp, &sc, sizeof(sc));
709 eflags = scp->sc_eflags;
710 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
713 if (!CS_SECURE(scp->sc_cs)) {
714 ksiginfo_init_trap(&ksi);
715 ksi.ksi_signo = SIGBUS;
716 ksi.ksi_code = BUS_OBJERR;
717 ksi.ksi_trapno = T_PROTFLT;
718 ksi.ksi_addr = (void *)regs->tf_rip;
719 trapsignal(td, &ksi);
722 regs->tf_ds = scp->sc_ds;
723 regs->tf_es = scp->sc_es;
724 regs->tf_fs = scp->sc_fs;
725 regs->tf_gs = scp->sc_gs;
727 regs->tf_rax = scp->sc_eax;
728 regs->tf_rbx = scp->sc_ebx;
729 regs->tf_rcx = scp->sc_ecx;
730 regs->tf_rdx = scp->sc_edx;
731 regs->tf_rsi = scp->sc_esi;
732 regs->tf_rdi = scp->sc_edi;
733 regs->tf_cs = scp->sc_cs;
734 regs->tf_ss = scp->sc_ss;
735 regs->tf_rbp = scp->sc_ebp;
736 regs->tf_rsp = scp->sc_esp;
737 regs->tf_rip = scp->sc_eip;
738 regs->tf_rflags = eflags;
740 if (scp->sc_onstack & 1)
741 td->td_sigstk.ss_flags |= SS_ONSTACK;
743 td->td_sigstk.ss_flags &= ~SS_ONSTACK;
745 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL,
747 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
748 return (EJUSTRETURN);
752 #ifdef COMPAT_FREEBSD4
754 freebsd4_freebsd32_sigreturn(struct thread *td,
755 struct freebsd4_freebsd32_sigreturn_args *uap)
757 struct ia32_freebsd4_ucontext uc;
758 struct trapframe *regs;
759 struct ia32_freebsd4_ucontext *ucp;
760 int cs, eflags, error;
763 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
768 eflags = ucp->uc_mcontext.mc_eflags;
770 * Don't allow users to change privileged or reserved flags.
772 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
773 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n",
774 td->td_proc->p_pid, td->td_name, eflags);
779 * Don't allow users to load a valid privileged %cs. Let the
780 * hardware check for invalid selectors, excess privilege in
781 * other selectors, invalid %eip's and invalid %esp's.
783 cs = ucp->uc_mcontext.mc_cs;
784 if (!CS_SECURE(cs)) {
785 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n",
786 td->td_proc->p_pid, td->td_name, cs);
787 ksiginfo_init_trap(&ksi);
788 ksi.ksi_signo = SIGBUS;
789 ksi.ksi_code = BUS_OBJERR;
790 ksi.ksi_trapno = T_PROTFLT;
791 ksi.ksi_addr = (void *)regs->tf_rip;
792 trapsignal(td, &ksi);
796 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
797 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
798 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
799 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
800 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
801 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
802 regs->tf_rax = ucp->uc_mcontext.mc_eax;
803 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
804 regs->tf_err = ucp->uc_mcontext.mc_err;
805 regs->tf_rip = ucp->uc_mcontext.mc_eip;
807 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
808 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
809 regs->tf_ss = ucp->uc_mcontext.mc_ss;
810 regs->tf_ds = ucp->uc_mcontext.mc_ds;
811 regs->tf_es = ucp->uc_mcontext.mc_es;
812 regs->tf_fs = ucp->uc_mcontext.mc_fs;
813 regs->tf_gs = ucp->uc_mcontext.mc_gs;
815 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
816 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
817 return (EJUSTRETURN);
819 #endif /* COMPAT_FREEBSD4 */
822 freebsd32_sigreturn(struct thread *td, struct freebsd32_sigreturn_args *uap)
824 struct ia32_ucontext uc;
825 struct trapframe *regs;
826 struct ia32_ucontext *ucp;
828 size_t xfpustate_len;
829 int cs, eflags, error, ret;
832 error = copyin(uap->sigcntxp, &uc, sizeof(uc));
837 eflags = ucp->uc_mcontext.mc_eflags;
839 * Don't allow users to change privileged or reserved flags.
841 if (!EFL_SECURE(eflags, regs->tf_rflags)) {
842 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n",
843 td->td_proc->p_pid, td->td_name, eflags);
848 * Don't allow users to load a valid privileged %cs. Let the
849 * hardware check for invalid selectors, excess privilege in
850 * other selectors, invalid %eip's and invalid %esp's.
852 cs = ucp->uc_mcontext.mc_cs;
853 if (!CS_SECURE(cs)) {
854 uprintf("pid %d (%s): sigreturn cs = 0x%x\n",
855 td->td_proc->p_pid, td->td_name, cs);
856 ksiginfo_init_trap(&ksi);
857 ksi.ksi_signo = SIGBUS;
858 ksi.ksi_code = BUS_OBJERR;
859 ksi.ksi_trapno = T_PROTFLT;
860 ksi.ksi_addr = (void *)regs->tf_rip;
861 trapsignal(td, &ksi);
865 if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) {
866 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len;
867 if (xfpustate_len > cpu_max_ext_state_size -
868 sizeof(struct savefpu)) {
869 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n",
870 td->td_proc->p_pid, td->td_name, xfpustate_len);
873 xfpustate = (char *)fpu_save_area_alloc();
874 error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate),
875 xfpustate, xfpustate_len);
877 fpu_save_area_free((struct savefpu *)xfpustate);
879 "pid %d (%s): sigreturn copying xfpustate failed\n",
880 td->td_proc->p_pid, td->td_name);
887 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate,
889 fpu_save_area_free((struct savefpu *)xfpustate);
891 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n",
892 td->td_proc->p_pid, td->td_name, ret);
896 regs->tf_rdi = ucp->uc_mcontext.mc_edi;
897 regs->tf_rsi = ucp->uc_mcontext.mc_esi;
898 regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
899 regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
900 regs->tf_rdx = ucp->uc_mcontext.mc_edx;
901 regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
902 regs->tf_rax = ucp->uc_mcontext.mc_eax;
903 regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
904 regs->tf_err = ucp->uc_mcontext.mc_err;
905 regs->tf_rip = ucp->uc_mcontext.mc_eip;
907 regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
908 regs->tf_rsp = ucp->uc_mcontext.mc_esp;
909 regs->tf_ss = ucp->uc_mcontext.mc_ss;
910 regs->tf_ds = ucp->uc_mcontext.mc_ds;
911 regs->tf_es = ucp->uc_mcontext.mc_es;
912 regs->tf_fs = ucp->uc_mcontext.mc_fs;
913 regs->tf_gs = ucp->uc_mcontext.mc_gs;
914 regs->tf_flags = TF_HASSEGS;
916 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0);
917 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
918 return (EJUSTRETURN);
922 * Clear registers on exec
925 ia32_setregs(struct thread *td, struct image_params *imgp, uintptr_t stack)
927 struct trapframe *regs;
929 register_t saved_rflags;
934 if (td->td_proc->p_md.md_ldt != NULL)
942 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__;
944 saved_rflags = regs->tf_rflags & PSL_T;
945 bzero((char *)regs, sizeof(struct trapframe));
946 regs->tf_rip = imgp->entry_addr;
947 regs->tf_rsp = stack;
948 regs->tf_rflags = PSL_USER | saved_rflags;
949 regs->tf_ss = _udatasel;
950 regs->tf_cs = _ucode32sel;
951 regs->tf_rbx = (register_t)imgp->ps_strings;
952 regs->tf_ds = _udatasel;
953 regs->tf_es = _udatasel;
954 regs->tf_fs = _ufssel;
955 regs->tf_gs = _ugssel;
956 regs->tf_flags = TF_HASSEGS;
958 x86_clear_dbregs(pcb);
962 /* Return via doreti so that we can change to a different %cs */
963 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);