ia32_signal.c revision 209208
1114987Speter/*- 2114987Speter * Copyright (c) 2003 Peter Wemm 3114987Speter * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 4114987Speter * All rights reserved. 5114987Speter * 6114987Speter * This code is derived from software contributed to Berkeley by 7114987Speter * William Jolitz. 8114987Speter * 9114987Speter * Redistribution and use in source and binary forms, with or without 10114987Speter * modification, are permitted provided that the following conditions 11114987Speter * are met: 12114987Speter * 1. Redistributions of source code must retain the above copyright 13114987Speter * notice, this list of conditions and the following disclaimer. 14114987Speter * 2. Redistributions in binary form must reproduce the above copyright 15114987Speter * notice, this list of conditions and the following disclaimer in the 16114987Speter * documentation and/or other materials provided with the distribution. 17114987Speter * 4. Neither the name of the University nor the names of its contributors 18114987Speter * may be used to endorse or promote products derived from this software 19114987Speter * without specific prior written permission. 20114987Speter * 21114987Speter * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22114987Speter * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23114987Speter * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24114987Speter * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25114987Speter * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26114987Speter * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27114987Speter * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28114987Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29114987Speter * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30114987Speter * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31114987Speter * SUCH DAMAGE. 32114987Speter */ 33114987Speter 34118031Sobrien#include <sys/cdefs.h> 35118031Sobrien__FBSDID("$FreeBSD: head/sys/amd64/ia32/ia32_signal.c 209208 2010-06-15 18:16:04Z kib $"); 36118031Sobrien 37114987Speter#include "opt_compat.h" 38114987Speter 39114987Speter#include <sys/param.h> 40114987Speter#include <sys/exec.h> 41114987Speter#include <sys/fcntl.h> 42114987Speter#include <sys/imgact.h> 43114987Speter#include <sys/kernel.h> 44114987Speter#include <sys/lock.h> 45114987Speter#include <sys/malloc.h> 46114987Speter#include <sys/mutex.h> 47114987Speter#include <sys/mman.h> 48114987Speter#include <sys/namei.h> 49114987Speter#include <sys/pioctl.h> 50114987Speter#include <sys/proc.h> 51114987Speter#include <sys/procfs.h> 52114987Speter#include <sys/resourcevar.h> 53114987Speter#include <sys/systm.h> 54114987Speter#include <sys/signalvar.h> 55114987Speter#include <sys/stat.h> 56114987Speter#include <sys/sx.h> 57114987Speter#include <sys/syscall.h> 58114987Speter#include <sys/sysctl.h> 59114987Speter#include <sys/sysent.h> 60114987Speter#include <sys/vnode.h> 61114987Speter 62114987Speter#include <vm/vm.h> 63114987Speter#include <vm/vm_kern.h> 64114987Speter#include <vm/vm_param.h> 65114987Speter#include <vm/pmap.h> 66114987Speter#include <vm/vm_map.h> 67114987Speter#include <vm/vm_object.h> 68114987Speter#include <vm/vm_extern.h> 69114987Speter 70163018Sdavidxu#include <compat/freebsd32/freebsd32_signal.h> 71119336Speter#include <compat/freebsd32/freebsd32_util.h> 72119336Speter#include <compat/freebsd32/freebsd32_proto.h> 73119336Speter#include <compat/ia32/ia32_signal.h> 74114987Speter#include <machine/psl.h> 75114987Speter#include <machine/segments.h> 76114987Speter#include <machine/specialreg.h> 77114987Speter#include <machine/frame.h> 78114987Speter#include <machine/md_var.h> 79114987Speter#include <machine/pcb.h> 80114987Speter#include <machine/cpufunc.h> 81114987Speter 82114987Speter#ifdef COMPAT_FREEBSD4 83151316Sdavidxustatic void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *); 84114987Speter#endif 85114987Speterstatic void ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp); 86114987Speterstatic int ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp); 87114987Speter 88114987Speter#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 89114987Speter#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 90114987Speter 91114987Speterstatic void 92114987Speteria32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp) 93114987Speter{ 94114987Speter 95209208Skib /* 96209208Skib * XXX Format of 64bit and 32bit FXSAVE areas differs. FXSAVE 97209208Skib * in 32bit mode saves %cs and %ds, while on 64bit it saves 98209208Skib * 64bit instruction and data pointers. Ignore the difference 99209208Skib * for now, it should be irrelevant for most applications. 100209208Skib */ 101150631Speter mcp->mc_ownedfp = fpugetregs(td, (struct savefpu *)&mcp->mc_fpstate); 102122292Speter mcp->mc_fpformat = fpuformat(); 103114987Speter} 104114987Speter 105114987Speterstatic int 106114987Speteria32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp) 107114987Speter{ 108114987Speter 109114987Speter if (mcp->mc_fpformat == _MC_FPFMT_NODEV) 110114987Speter return (0); 111114987Speter else if (mcp->mc_fpformat != _MC_FPFMT_XMM) 112114987Speter return (EINVAL); 113114987Speter else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) 114114987Speter /* We don't care what state is left in the FPU or PCB. */ 115114987Speter fpstate_drop(td); 116114987Speter else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || 117114987Speter mcp->mc_ownedfp == _MC_FPOWNED_PCB) { 118150631Speter fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate); 119114987Speter } else 120114987Speter return (EINVAL); 121114987Speter return (0); 122114987Speter} 123114987Speter 124114987Speter/* 125150631Speter * Get machine context. 126150631Speter */ 127150631Speterstatic int 128150631Speteria32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags) 129150631Speter{ 130150631Speter struct trapframe *tp; 131150631Speter 132150631Speter tp = td->td_frame; 133150631Speter 134150631Speter PROC_LOCK(curthread->td_proc); 135150631Speter mcp->mc_onstack = sigonstack(tp->tf_rsp); 136150631Speter PROC_UNLOCK(curthread->td_proc); 137190620Skib /* Entry into kernel always sets TF_HASSEGS */ 138190620Skib mcp->mc_gs = tp->tf_gs; 139190620Skib mcp->mc_fs = tp->tf_fs; 140190620Skib mcp->mc_es = tp->tf_es; 141190620Skib mcp->mc_ds = tp->tf_ds; 142150631Speter mcp->mc_edi = tp->tf_rdi; 143150631Speter mcp->mc_esi = tp->tf_rsi; 144150631Speter mcp->mc_ebp = tp->tf_rbp; 145150631Speter mcp->mc_isp = tp->tf_rsp; 146206992Skib mcp->mc_eflags = tp->tf_rflags; 147150631Speter if (flags & GET_MC_CLEAR_RET) { 148150631Speter mcp->mc_eax = 0; 149150631Speter mcp->mc_edx = 0; 150206992Skib mcp->mc_eflags &= ~PSL_C; 151150631Speter } else { 152150631Speter mcp->mc_eax = tp->tf_rax; 153150631Speter mcp->mc_edx = tp->tf_rdx; 154150631Speter } 155150631Speter mcp->mc_ebx = tp->tf_rbx; 156150631Speter mcp->mc_ecx = tp->tf_rcx; 157150631Speter mcp->mc_eip = tp->tf_rip; 158150631Speter mcp->mc_cs = tp->tf_cs; 159150631Speter mcp->mc_esp = tp->tf_rsp; 160150631Speter mcp->mc_ss = tp->tf_ss; 161150631Speter mcp->mc_len = sizeof(*mcp); 162150631Speter ia32_get_fpcontext(td, mcp); 163190620Skib mcp->mc_fsbase = td->td_pcb->pcb_fsbase; 164190620Skib mcp->mc_gsbase = td->td_pcb->pcb_gsbase; 165195486Skib td->td_pcb->pcb_full_iret = 1; 166150631Speter return (0); 167150631Speter} 168150631Speter 169150631Speter/* 170150631Speter * Set machine context. 171150631Speter * 172150631Speter * However, we don't set any but the user modifiable flags, and we won't 173150631Speter * touch the cs selector. 174150631Speter */ 175150631Speterstatic int 176150631Speteria32_set_mcontext(struct thread *td, const struct ia32_mcontext *mcp) 177150631Speter{ 178150631Speter struct trapframe *tp; 179150631Speter long rflags; 180150631Speter int ret; 181150631Speter 182150631Speter tp = td->td_frame; 183150631Speter if (mcp->mc_len != sizeof(*mcp)) 184150631Speter return (EINVAL); 185150631Speter rflags = (mcp->mc_eflags & PSL_USERCHANGE) | 186150631Speter (tp->tf_rflags & ~PSL_USERCHANGE); 187150631Speter ret = ia32_set_fpcontext(td, mcp); 188150631Speter if (ret != 0) 189150631Speter return (ret); 190190620Skib tp->tf_gs = mcp->mc_gs; 191150631Speter tp->tf_fs = mcp->mc_fs; 192150631Speter tp->tf_es = mcp->mc_es; 193150631Speter tp->tf_ds = mcp->mc_ds; 194190620Skib tp->tf_flags = TF_HASSEGS; 195150631Speter tp->tf_rdi = mcp->mc_edi; 196150631Speter tp->tf_rsi = mcp->mc_esi; 197150631Speter tp->tf_rbp = mcp->mc_ebp; 198150631Speter tp->tf_rbx = mcp->mc_ebx; 199150631Speter tp->tf_rdx = mcp->mc_edx; 200150631Speter tp->tf_rcx = mcp->mc_ecx; 201150631Speter tp->tf_rax = mcp->mc_eax; 202150631Speter /* trapno, err */ 203150631Speter tp->tf_rip = mcp->mc_eip; 204150631Speter tp->tf_rflags = rflags; 205150631Speter tp->tf_rsp = mcp->mc_esp; 206150631Speter tp->tf_ss = mcp->mc_ss; 207150631Speter td->td_pcb->pcb_flags |= PCB_FULLCTX; 208195486Skib td->td_pcb->pcb_full_iret = 1; 209150631Speter return (0); 210150631Speter} 211150631Speter 212150631Speter/* 213150631Speter * The first two fields of a ucontext_t are the signal mask and 214150631Speter * the machine context. The next field is uc_link; we want to 215150631Speter * avoid destroying the link when copying out contexts. 216150631Speter */ 217150631Speter#define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link) 218150631Speter 219150631Speterint 220150631Speterfreebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 221150631Speter{ 222150631Speter struct ia32_ucontext uc; 223150631Speter int ret; 224150631Speter 225150631Speter if (uap->ucp == NULL) 226150631Speter ret = EINVAL; 227150631Speter else { 228150631Speter ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 229150631Speter PROC_LOCK(td->td_proc); 230150631Speter uc.uc_sigmask = td->td_sigmask; 231150631Speter PROC_UNLOCK(td->td_proc); 232150631Speter ret = copyout(&uc, uap->ucp, UC_COPY_SIZE); 233150631Speter } 234150631Speter return (ret); 235150631Speter} 236150631Speter 237150631Speterint 238150631Speterfreebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 239150631Speter{ 240150631Speter struct ia32_ucontext uc; 241150631Speter int ret; 242150631Speter 243150631Speter if (uap->ucp == NULL) 244150631Speter ret = EINVAL; 245150631Speter else { 246150631Speter ret = copyin(uap->ucp, &uc, UC_COPY_SIZE); 247150631Speter if (ret == 0) { 248150631Speter ret = ia32_set_mcontext(td, &uc.uc_mcontext); 249150631Speter if (ret == 0) { 250198507Skib kern_sigprocmask(td, SIG_SETMASK, 251198507Skib &uc.uc_sigmask, NULL, 0); 252150631Speter } 253150631Speter } 254150631Speter } 255150631Speter return (ret == 0 ? EJUSTRETURN : ret); 256150631Speter} 257150631Speter 258150631Speterint 259150631Speterfreebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 260150631Speter{ 261150631Speter struct ia32_ucontext uc; 262150631Speter int ret; 263150631Speter 264150631Speter if (uap->oucp == NULL || uap->ucp == NULL) 265150631Speter ret = EINVAL; 266150631Speter else { 267150631Speter ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 268150631Speter PROC_LOCK(td->td_proc); 269150631Speter uc.uc_sigmask = td->td_sigmask; 270150631Speter PROC_UNLOCK(td->td_proc); 271150631Speter ret = copyout(&uc, uap->oucp, UC_COPY_SIZE); 272150631Speter if (ret == 0) { 273150631Speter ret = copyin(uap->ucp, &uc, UC_COPY_SIZE); 274150631Speter if (ret == 0) { 275150631Speter ret = ia32_set_mcontext(td, &uc.uc_mcontext); 276150631Speter if (ret == 0) { 277198507Skib kern_sigprocmask(td, SIG_SETMASK, 278198507Skib &uc.uc_sigmask, NULL, 0); 279150631Speter } 280150631Speter } 281150631Speter } 282150631Speter } 283150631Speter return (ret == 0 ? EJUSTRETURN : ret); 284150631Speter} 285150631Speter 286150631Speter/* 287114987Speter * Send an interrupt to process. 288114987Speter * 289114987Speter * Stack is set up to allow sigcode stored 290114987Speter * at top to call routine, followed by kcall 291114987Speter * to sigreturn routine below. After sigreturn 292114987Speter * resets the signal mask, the stack, and the 293114987Speter * frame pointer, it returns to the user 294114987Speter * specified pc, psl. 295114987Speter */ 296114987Speter#ifdef COMPAT_FREEBSD4 297114987Speterstatic void 298151316Sdavidxufreebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 299114987Speter{ 300114987Speter struct ia32_sigframe4 sf, *sfp; 301163018Sdavidxu struct siginfo32 siginfo; 302114987Speter struct proc *p; 303114987Speter struct thread *td; 304114987Speter struct sigacts *psp; 305114987Speter struct trapframe *regs; 306114987Speter int oonstack; 307151316Sdavidxu int sig; 308114987Speter 309114987Speter td = curthread; 310114987Speter p = td->td_proc; 311163018Sdavidxu siginfo_to_siginfo32(&ksi->ksi_info, &siginfo); 312151316Sdavidxu 313114987Speter PROC_LOCK_ASSERT(p, MA_OWNED); 314151316Sdavidxu sig = siginfo.si_signo; 315114987Speter psp = p->p_sigacts; 316123119Speter mtx_assert(&psp->ps_mtx, MA_OWNED); 317114987Speter regs = td->td_frame; 318114987Speter oonstack = sigonstack(regs->tf_rsp); 319114987Speter 320114987Speter /* Save user context. */ 321114987Speter bzero(&sf, sizeof(sf)); 322114987Speter sf.sf_uc.uc_sigmask = *mask; 323124092Sdavidxu sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp; 324124092Sdavidxu sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 325124092Sdavidxu sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 326114987Speter ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 327114987Speter sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 328114987Speter sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi; 329114987Speter sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi; 330114987Speter sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp; 331114987Speter sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */ 332114987Speter sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx; 333114987Speter sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx; 334114987Speter sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx; 335114987Speter sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax; 336114987Speter sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno; 337114987Speter sf.sf_uc.uc_mcontext.mc_err = regs->tf_err; 338114987Speter sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip; 339114987Speter sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs; 340114987Speter sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags; 341114987Speter sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp; 342114987Speter sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss; 343190620Skib sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds; 344190620Skib sf.sf_uc.uc_mcontext.mc_es = regs->tf_es; 345190620Skib sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs; 346190620Skib sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs; 347114987Speter 348114987Speter /* Allocate space for the signal handler context. */ 349124092Sdavidxu if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 350114987Speter SIGISMEMBER(psp->ps_sigonstack, sig)) { 351124092Sdavidxu sfp = (struct ia32_sigframe4 *)(td->td_sigstk.ss_sp + 352124092Sdavidxu td->td_sigstk.ss_size - sizeof(sf)); 353114987Speter } else 354114987Speter sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1; 355114987Speter PROC_UNLOCK(p); 356114987Speter 357114987Speter /* Translate the signal if appropriate. */ 358114987Speter if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 359114987Speter sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 360114987Speter 361114987Speter /* Build the argument list for the signal handler. */ 362114987Speter sf.sf_signum = sig; 363114987Speter sf.sf_ucontext = (register_t)&sfp->sf_uc; 364126089Speter if (SIGISMEMBER(psp->ps_siginfo, sig)) { 365114987Speter /* Signal handler installed with SA_SIGINFO. */ 366114987Speter sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si; 367114987Speter sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 368114987Speter 369114987Speter /* Fill in POSIX parts */ 370151316Sdavidxu sf.sf_si = siginfo; 371114987Speter sf.sf_si.si_signo = sig; 372114987Speter } else { 373114987Speter /* Old FreeBSD-style arguments. */ 374151316Sdavidxu sf.sf_siginfo = siginfo.si_code; 375151316Sdavidxu sf.sf_addr = (u_int32_t)siginfo.si_addr; 376114987Speter sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 377114987Speter } 378123119Speter mtx_unlock(&psp->ps_mtx); 379114987Speter 380114987Speter /* 381114987Speter * Copy the sigframe out to the user's stack. 382114987Speter */ 383114987Speter if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 384114987Speter#ifdef DEBUG 385114987Speter printf("process %ld has trashed its stack\n", (long)p->p_pid); 386114987Speter#endif 387114987Speter PROC_LOCK(p); 388114987Speter sigexit(td, SIGILL); 389114987Speter } 390114987Speter 391114987Speter regs->tf_rsp = (uintptr_t)sfp; 392119336Speter regs->tf_rip = FREEBSD32_PS_STRINGS - sz_freebsd4_ia32_sigcode; 393177145Skib regs->tf_rflags &= ~(PSL_T | PSL_D); 394114987Speter regs->tf_cs = _ucode32sel; 395114987Speter regs->tf_ss = _udatasel; 396190620Skib regs->tf_ds = _udatasel; 397190620Skib regs->tf_es = _udatasel; 398195486Skib td->td_pcb->pcb_full_iret = 1; 399114987Speter /* leave user %fs and %gs untouched */ 400114987Speter PROC_LOCK(p); 401123119Speter mtx_lock(&psp->ps_mtx); 402114987Speter} 403114987Speter#endif /* COMPAT_FREEBSD4 */ 404114987Speter 405114987Spetervoid 406151316Sdavidxuia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 407114987Speter{ 408114987Speter struct ia32_sigframe sf, *sfp; 409163018Sdavidxu struct siginfo32 siginfo; 410114987Speter struct proc *p; 411114987Speter struct thread *td; 412114987Speter struct sigacts *psp; 413114987Speter char *sp; 414114987Speter struct trapframe *regs; 415114987Speter int oonstack; 416151316Sdavidxu int sig; 417114987Speter 418163018Sdavidxu siginfo_to_siginfo32(&ksi->ksi_info, &siginfo); 419114987Speter td = curthread; 420114987Speter p = td->td_proc; 421114987Speter PROC_LOCK_ASSERT(p, MA_OWNED); 422151316Sdavidxu sig = siginfo.si_signo; 423114987Speter psp = p->p_sigacts; 424114987Speter#ifdef COMPAT_FREEBSD4 425114987Speter if (SIGISMEMBER(psp->ps_freebsd4, sig)) { 426151316Sdavidxu freebsd4_ia32_sendsig(catcher, ksi, mask); 427114987Speter return; 428114987Speter } 429114987Speter#endif 430123119Speter mtx_assert(&psp->ps_mtx, MA_OWNED); 431114987Speter regs = td->td_frame; 432114987Speter oonstack = sigonstack(regs->tf_rsp); 433114987Speter 434114987Speter /* Save user context. */ 435114987Speter bzero(&sf, sizeof(sf)); 436114987Speter sf.sf_uc.uc_sigmask = *mask; 437124092Sdavidxu sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp; 438124092Sdavidxu sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 439124092Sdavidxu sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 440114987Speter ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 441114987Speter sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 442114987Speter sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi; 443114987Speter sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi; 444114987Speter sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp; 445114987Speter sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */ 446114987Speter sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx; 447114987Speter sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx; 448114987Speter sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx; 449114987Speter sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax; 450114987Speter sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno; 451114987Speter sf.sf_uc.uc_mcontext.mc_err = regs->tf_err; 452114987Speter sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip; 453114987Speter sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs; 454114987Speter sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags; 455114987Speter sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp; 456114987Speter sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss; 457190620Skib sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds; 458190620Skib sf.sf_uc.uc_mcontext.mc_es = regs->tf_es; 459190620Skib sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs; 460190620Skib sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs; 461114987Speter sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ 462114987Speter ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext); 463114987Speter fpstate_drop(td); 464190620Skib sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase; 465190620Skib sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase; 466114987Speter 467114987Speter /* Allocate space for the signal handler context. */ 468124092Sdavidxu if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 469114987Speter SIGISMEMBER(psp->ps_sigonstack, sig)) { 470124092Sdavidxu sp = td->td_sigstk.ss_sp + 471124092Sdavidxu td->td_sigstk.ss_size - sizeof(sf); 472114987Speter } else 473114987Speter sp = (char *)regs->tf_rsp - sizeof(sf); 474114987Speter /* Align to 16 bytes. */ 475114987Speter sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF); 476114987Speter PROC_UNLOCK(p); 477114987Speter 478114987Speter /* Translate the signal if appropriate. */ 479114987Speter if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize) 480114987Speter sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 481114987Speter 482114987Speter /* Build the argument list for the signal handler. */ 483114987Speter sf.sf_signum = sig; 484114987Speter sf.sf_ucontext = (register_t)&sfp->sf_uc; 485126089Speter if (SIGISMEMBER(psp->ps_siginfo, sig)) { 486114987Speter /* Signal handler installed with SA_SIGINFO. */ 487114987Speter sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si; 488114987Speter sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 489114987Speter 490114987Speter /* Fill in POSIX parts */ 491151316Sdavidxu sf.sf_si = siginfo; 492114987Speter sf.sf_si.si_signo = sig; 493114987Speter } else { 494114987Speter /* Old FreeBSD-style arguments. */ 495151316Sdavidxu sf.sf_siginfo = siginfo.si_code; 496151316Sdavidxu sf.sf_addr = (u_int32_t)siginfo.si_addr; 497114987Speter sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 498114987Speter } 499123119Speter mtx_unlock(&psp->ps_mtx); 500114987Speter 501114987Speter /* 502114987Speter * Copy the sigframe out to the user's stack. 503114987Speter */ 504114987Speter if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 505114987Speter#ifdef DEBUG 506114987Speter printf("process %ld has trashed its stack\n", (long)p->p_pid); 507114987Speter#endif 508114987Speter PROC_LOCK(p); 509114987Speter sigexit(td, SIGILL); 510114987Speter } 511114987Speter 512114987Speter regs->tf_rsp = (uintptr_t)sfp; 513119336Speter regs->tf_rip = FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 514177145Skib regs->tf_rflags &= ~(PSL_T | PSL_D); 515114987Speter regs->tf_cs = _ucode32sel; 516114987Speter regs->tf_ss = _udatasel; 517190620Skib regs->tf_ds = _udatasel; 518190620Skib regs->tf_es = _udatasel; 519195486Skib td->td_pcb->pcb_full_iret = 1; 520190620Skib /* XXXKIB leave user %fs and %gs untouched */ 521114987Speter PROC_LOCK(p); 522123119Speter mtx_lock(&psp->ps_mtx); 523114987Speter} 524114987Speter 525114987Speter/* 526114987Speter * System call to cleanup state after a signal 527114987Speter * has been taken. Reset signal mask and 528114987Speter * stack state from context left by sendsig (above). 529114987Speter * Return to previous pc and psl as specified by 530114987Speter * context left by sendsig. Check carefully to 531114987Speter * make sure that the user has not modified the 532114987Speter * state to gain improper privileges. 533114987Speter */ 534114987Speter#ifdef COMPAT_FREEBSD4 535114987Speter/* 536114987Speter * MPSAFE 537114987Speter */ 538114987Speterint 539119336Speterfreebsd4_freebsd32_sigreturn(td, uap) 540114987Speter struct thread *td; 541119336Speter struct freebsd4_freebsd32_sigreturn_args /* { 542119336Speter const struct freebsd4_freebsd32_ucontext *sigcntxp; 543114987Speter } */ *uap; 544114987Speter{ 545114987Speter struct ia32_ucontext4 uc; 546114987Speter struct trapframe *regs; 547198507Skib struct ia32_ucontext4 *ucp; 548114987Speter int cs, eflags, error; 549151316Sdavidxu ksiginfo_t ksi; 550114987Speter 551114987Speter error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 552114987Speter if (error != 0) 553114987Speter return (error); 554114987Speter ucp = &uc; 555114987Speter regs = td->td_frame; 556114987Speter eflags = ucp->uc_mcontext.mc_eflags; 557114987Speter /* 558114987Speter * Don't allow users to change privileged or reserved flags. 559114987Speter */ 560114987Speter /* 561114987Speter * XXX do allow users to change the privileged flag PSL_RF. 562114987Speter * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 563114987Speter * should sometimes set it there too. tf_eflags is kept in 564114987Speter * the signal context during signal handling and there is no 565114987Speter * other place to remember it, so the PSL_RF bit may be 566114987Speter * corrupted by the signal handler without us knowing. 567114987Speter * Corruption of the PSL_RF bit at worst causes one more or 568114987Speter * one less debugger trap, so allowing it is fairly harmless. 569114987Speter */ 570114987Speter if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 571206553Skib uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n", 572206553Skib td->td_proc->p_pid, td->td_name, eflags); 573114987Speter return (EINVAL); 574114987Speter } 575114987Speter 576114987Speter /* 577114987Speter * Don't allow users to load a valid privileged %cs. Let the 578114987Speter * hardware check for invalid selectors, excess privilege in 579114987Speter * other selectors, invalid %eip's and invalid %esp's. 580114987Speter */ 581114987Speter cs = ucp->uc_mcontext.mc_cs; 582114987Speter if (!CS_SECURE(cs)) { 583206553Skib uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n", 584206553Skib td->td_proc->p_pid, td->td_name, cs); 585151316Sdavidxu ksiginfo_init_trap(&ksi); 586151316Sdavidxu ksi.ksi_signo = SIGBUS; 587151316Sdavidxu ksi.ksi_code = BUS_OBJERR; 588151316Sdavidxu ksi.ksi_trapno = T_PROTFLT; 589151316Sdavidxu ksi.ksi_addr = (void *)regs->tf_rip; 590151316Sdavidxu trapsignal(td, &ksi); 591114987Speter return (EINVAL); 592114987Speter } 593114987Speter 594114987Speter regs->tf_rdi = ucp->uc_mcontext.mc_edi; 595114987Speter regs->tf_rsi = ucp->uc_mcontext.mc_esi; 596114987Speter regs->tf_rbp = ucp->uc_mcontext.mc_ebp; 597114987Speter regs->tf_rbx = ucp->uc_mcontext.mc_ebx; 598114987Speter regs->tf_rdx = ucp->uc_mcontext.mc_edx; 599114987Speter regs->tf_rcx = ucp->uc_mcontext.mc_ecx; 600114987Speter regs->tf_rax = ucp->uc_mcontext.mc_eax; 601114987Speter regs->tf_trapno = ucp->uc_mcontext.mc_trapno; 602114987Speter regs->tf_err = ucp->uc_mcontext.mc_err; 603114987Speter regs->tf_rip = ucp->uc_mcontext.mc_eip; 604114987Speter regs->tf_cs = cs; 605114987Speter regs->tf_rflags = ucp->uc_mcontext.mc_eflags; 606114987Speter regs->tf_rsp = ucp->uc_mcontext.mc_esp; 607114987Speter regs->tf_ss = ucp->uc_mcontext.mc_ss; 608190620Skib regs->tf_ds = ucp->uc_mcontext.mc_ds; 609190620Skib regs->tf_es = ucp->uc_mcontext.mc_es; 610190620Skib regs->tf_fs = ucp->uc_mcontext.mc_fs; 611190620Skib regs->tf_gs = ucp->uc_mcontext.mc_gs; 612114987Speter 613198507Skib kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); 614195486Skib td->td_pcb->pcb_full_iret = 1; 615114987Speter return (EJUSTRETURN); 616114987Speter} 617114987Speter#endif /* COMPAT_FREEBSD4 */ 618114987Speter 619114987Speter/* 620114987Speter * MPSAFE 621114987Speter */ 622114987Speterint 623119336Speterfreebsd32_sigreturn(td, uap) 624114987Speter struct thread *td; 625119336Speter struct freebsd32_sigreturn_args /* { 626119336Speter const struct freebsd32_ucontext *sigcntxp; 627114987Speter } */ *uap; 628114987Speter{ 629114987Speter struct ia32_ucontext uc; 630114987Speter struct trapframe *regs; 631198507Skib struct ia32_ucontext *ucp; 632114987Speter int cs, eflags, error, ret; 633151316Sdavidxu ksiginfo_t ksi; 634114987Speter 635114987Speter error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 636114987Speter if (error != 0) 637114987Speter return (error); 638114987Speter ucp = &uc; 639114987Speter regs = td->td_frame; 640114987Speter eflags = ucp->uc_mcontext.mc_eflags; 641114987Speter /* 642114987Speter * Don't allow users to change privileged or reserved flags. 643114987Speter */ 644114987Speter /* 645114987Speter * XXX do allow users to change the privileged flag PSL_RF. 646114987Speter * The cpu sets PSL_RF in tf_eflags for faults. Debuggers 647114987Speter * should sometimes set it there too. tf_eflags is kept in 648114987Speter * the signal context during signal handling and there is no 649114987Speter * other place to remember it, so the PSL_RF bit may be 650114987Speter * corrupted by the signal handler without us knowing. 651114987Speter * Corruption of the PSL_RF bit at worst causes one more or 652114987Speter * one less debugger trap, so allowing it is fairly harmless. 653114987Speter */ 654114987Speter if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 655206553Skib uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n", 656206553Skib td->td_proc->p_pid, td->td_name, eflags); 657114987Speter return (EINVAL); 658114987Speter } 659114987Speter 660114987Speter /* 661114987Speter * Don't allow users to load a valid privileged %cs. Let the 662114987Speter * hardware check for invalid selectors, excess privilege in 663114987Speter * other selectors, invalid %eip's and invalid %esp's. 664114987Speter */ 665114987Speter cs = ucp->uc_mcontext.mc_cs; 666114987Speter if (!CS_SECURE(cs)) { 667206553Skib uprintf("pid %d (%s): sigreturn cs = 0x%x\n", 668206553Skib td->td_proc->p_pid, td->td_name, cs); 669151316Sdavidxu ksiginfo_init_trap(&ksi); 670151316Sdavidxu ksi.ksi_signo = SIGBUS; 671151316Sdavidxu ksi.ksi_code = BUS_OBJERR; 672151316Sdavidxu ksi.ksi_trapno = T_PROTFLT; 673151316Sdavidxu ksi.ksi_addr = (void *)regs->tf_rip; 674151316Sdavidxu trapsignal(td, &ksi); 675114987Speter return (EINVAL); 676114987Speter } 677114987Speter 678114987Speter ret = ia32_set_fpcontext(td, &ucp->uc_mcontext); 679114987Speter if (ret != 0) 680114987Speter return (ret); 681114987Speter 682114987Speter regs->tf_rdi = ucp->uc_mcontext.mc_edi; 683114987Speter regs->tf_rsi = ucp->uc_mcontext.mc_esi; 684114987Speter regs->tf_rbp = ucp->uc_mcontext.mc_ebp; 685114987Speter regs->tf_rbx = ucp->uc_mcontext.mc_ebx; 686114987Speter regs->tf_rdx = ucp->uc_mcontext.mc_edx; 687114987Speter regs->tf_rcx = ucp->uc_mcontext.mc_ecx; 688114987Speter regs->tf_rax = ucp->uc_mcontext.mc_eax; 689114987Speter regs->tf_trapno = ucp->uc_mcontext.mc_trapno; 690114987Speter regs->tf_err = ucp->uc_mcontext.mc_err; 691114987Speter regs->tf_rip = ucp->uc_mcontext.mc_eip; 692114987Speter regs->tf_cs = cs; 693114987Speter regs->tf_rflags = ucp->uc_mcontext.mc_eflags; 694114987Speter regs->tf_rsp = ucp->uc_mcontext.mc_esp; 695114987Speter regs->tf_ss = ucp->uc_mcontext.mc_ss; 696190620Skib regs->tf_ds = ucp->uc_mcontext.mc_ds; 697190620Skib regs->tf_es = ucp->uc_mcontext.mc_es; 698190620Skib regs->tf_fs = ucp->uc_mcontext.mc_fs; 699190620Skib regs->tf_gs = ucp->uc_mcontext.mc_gs; 700190620Skib regs->tf_flags = TF_HASSEGS; 701114987Speter 702198507Skib kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); 703195486Skib td->td_pcb->pcb_full_iret = 1; 704114987Speter return (EJUSTRETURN); 705114987Speter} 706122303Speter 707122303Speter/* 708122303Speter * Clear registers on exec 709122303Speter */ 710122303Spetervoid 711205642Snwhitehornia32_setregs(struct thread *td, struct image_params *imgp, u_long stack) 712122303Speter{ 713122303Speter struct trapframe *regs = td->td_frame; 714122303Speter struct pcb *pcb = td->td_pcb; 715122303Speter 716190620Skib mtx_lock(&dt_lock); 717190620Skib if (td->td_proc->p_md.md_ldt != NULL) 718190620Skib user_ldt_free(td); 719190620Skib else 720190620Skib mtx_unlock(&dt_lock); 721190620Skib 722122303Speter pcb->pcb_fsbase = 0; 723122303Speter pcb->pcb_gsbase = 0; 724189423Sjhb pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__; 725122303Speter 726122303Speter bzero((char *)regs, sizeof(struct trapframe)); 727205642Snwhitehorn regs->tf_rip = imgp->entry_addr; 728122303Speter regs->tf_rsp = stack; 729122303Speter regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 730122303Speter regs->tf_ss = _udatasel; 731122303Speter regs->tf_cs = _ucode32sel; 732205642Snwhitehorn regs->tf_rbx = imgp->ps_strings; 733190620Skib regs->tf_ds = _udatasel; 734190620Skib regs->tf_es = _udatasel; 735190620Skib regs->tf_fs = _ufssel; 736190620Skib regs->tf_gs = _ugssel; 737190620Skib regs->tf_flags = TF_HASSEGS; 738190620Skib 739122303Speter load_cr0(rcr0() | CR0_MP | CR0_TS); 740122303Speter fpstate_drop(td); 741122303Speter 742122303Speter /* Return via doreti so that we can change to a different %cs */ 743180992Skib pcb->pcb_flags |= PCB_FULLCTX | PCB_32BIT; 744182684Skib pcb->pcb_flags &= ~PCB_GS32BIT; 745195486Skib td->td_pcb->pcb_full_iret = 1; 746122303Speter td->td_retval[1] = 0; 747122303Speter} 748