1 /* $NetBSD: compat_16_machdep.c,v 1.17 2011/06/07 00:48:29 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center and by Chris G. Demetriou. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 35 * All rights reserved. 36 * 37 * Author: Chris G. Demetriou 38 * 39 * Permission to use, copy, modify and distribute this software and 40 * its documentation is hereby granted, provided that both the copyright 41 * notice and this permission notice appear in all copies of the 42 * software, derivative works or modified versions, and any portions 43 * thereof, and that both notices appear in supporting documentation. 44 * 45 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 46 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 47 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 48 * 49 * Carnegie Mellon requests users of this software to return to 50 * 51 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 52 * School of Computer Science 53 * Carnegie Mellon University 54 * Pittsburgh PA 15213-3890 55 * 56 * any improvements or extensions that they make and grant Carnegie the 57 * rights to redistribute these changes. 58 */ 59 60 #ifdef _KERNEL_OPT 61 #include "opt_ddb.h" 62 #include "opt_kgdb.h" 63 #include "opt_multiprocessor.h" 64 #include "opt_dec_3000_300.h" 65 #include "opt_dec_3000_500.h" 66 #include "opt_compat_osf1.h" 67 #include "opt_compat_netbsd.h" 68 #include "opt_execfmt.h" 69 #endif /* _KERNEL_OPT */ 70 71 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 72 #include <sys/types.h> 73 #include <sys/param.h> 74 #include <sys/signal.h> 75 #include <sys/mount.h> 76 #include <sys/proc.h> 77 #include <sys/systm.h> 78 #include <sys/syscall.h> 79 #include <sys/syscallargs.h> 80 81 #if defined(COMPAT_13) || defined(COMPAT_OSF1) 82 #include <compat/sys/signal.h> 83 #include <compat/sys/signalvar.h> 84 #endif 85 86 #include <machine/cpu.h> 87 #include <machine/reg.h> 88 89 __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.17 2011/06/07 00:48:29 matt Exp $"); 90 91 92 #ifdef DEBUG 93 #include <machine/sigdebug.h> 94 #endif 95 96 #include <machine/alpha.h> 97 98 #include <sys/ksyms.h> 99 100 /* 101 * Send an interrupt to process, old style 102 */ 103 void 104 sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) 105 { 106 struct lwp *l = curlwp; 107 struct proc *p = l->l_proc; 108 struct pcb *pcb = lwp_getpcb(l); 109 struct sigacts *ps = p->p_sigacts; 110 int onstack, sig = ksi->ksi_signo, error; 111 struct sigframe_sigcontext *fp, frame; 112 struct trapframe *tf; 113 sig_t catcher = SIGACTION(p, sig).sa_handler; 114 115 tf = l->l_md.md_tf; 116 fp = getframe(l, sig, &onstack), frame; 117 fp--; 118 119 #ifdef DEBUG 120 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 121 printf("sendsig_sigcontext(%d): sig %d ssp %p usp %p\n", 122 p->p_pid, sig, &onstack, fp); 123 #endif 124 125 /* Build stack frame for signal trampoline. */ 126 frame.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 127 frame.sf_sc.sc_ps = tf->tf_regs[FRAME_PS]; 128 129 /* Save register context. */ 130 frametoreg(tf, (struct reg *)frame.sf_sc.sc_regs); 131 frame.sf_sc.sc_regs[R_ZERO] = 0xACEDBADE; /* magic number */ 132 frame.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 133 134 /* save the floating-point state, if necessary, then copy it. */ 135 fpu_save(); 136 frame.sf_sc.sc_ownedfp = fpu_used_p(l); 137 memcpy((struct fpreg *)frame.sf_sc.sc_fpregs, &pcb->pcb_fp, 138 sizeof(struct fpreg)); 139 frame.sf_sc.sc_fp_control = alpha_read_fp_c(l); 140 memset(frame.sf_sc.sc_reserved, 0, sizeof frame.sf_sc.sc_reserved); 141 memset(frame.sf_sc.sc_xxx, 0, sizeof frame.sf_sc.sc_xxx); /* XXX */ 142 143 /* Save signal stack. */ 144 frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; 145 146 /* Save signal mask. */ 147 frame.sf_sc.sc_mask = *mask; 148 149 #if defined(COMPAT_13) || defined(COMPAT_OSF1) 150 /* 151 * XXX We always have to save an old style signal mask because 152 * XXX we might be delivering a signal to a process which will 153 * XXX escape from the signal in a non-standard way and invoke 154 * XXX sigreturn() directly. 155 */ 156 { 157 /* Note: it's a long in the stack frame. */ 158 sigset13_t mask13; 159 160 native_sigset_to_sigset13(mask, &mask13); 161 frame.sf_sc.__sc_mask13 = mask13; 162 } 163 #endif 164 165 sendsig_reset(l, sig); 166 mutex_exit(p->p_lock); 167 error = copyout(&frame, (void *)fp, sizeof(frame)); 168 mutex_enter(p->p_lock); 169 170 if (error != 0) { 171 /* 172 * Process has trashed its stack; give it an illegal 173 * instruction to halt it in its tracks. 174 */ 175 #ifdef DEBUG 176 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 177 printf("sendsig_sigcontext(%d): copyout failed on sig %d\n", 178 p->p_pid, sig); 179 #endif 180 sigexit(l, SIGILL); 181 /* NOTREACHED */ 182 } 183 #ifdef DEBUG 184 if (sigdebug & SDB_FOLLOW) 185 printf("sendsig_sigcontext(%d): sig %d usp %p code %x\n", 186 p->p_pid, sig, fp, ksi->ksi_code); 187 #endif 188 189 /* 190 * Set up the registers to directly invoke the signal handler. The 191 * signal trampoline is then used to return from the signal. Note 192 * the trampoline version numbers are coordinated with machine- 193 * dependent code in libc. 194 */ 195 switch (ps->sa_sigdesc[sig].sd_vers) { 196 case 0: /* legacy on-stack sigtramp */ 197 buildcontext(l,(void *)catcher, 198 (void *)p->p_sigctx.ps_sigcode, 199 (void *)fp); 200 break; 201 #ifdef COMPAT_16 202 case 1: 203 buildcontext(l,(void *)catcher, 204 (const void *)ps->sa_sigdesc[sig].sd_tramp, 205 (void *)fp); 206 break; 207 #endif 208 default: 209 /* Don't know what trampoline version; kill it. */ 210 sigexit(l, SIGILL); 211 } 212 213 /* sigcontext specific trap frame */ 214 tf->tf_regs[FRAME_A0] = sig; 215 216 /* tf->tf_regs[FRAME_A1] = ksi->ksi_code; */ 217 tf->tf_regs[FRAME_A1] = KSI_TRAPCODE(ksi); 218 tf->tf_regs[FRAME_A2] = (u_int64_t)&fp->sf_sc; 219 220 /* Remember that we're now on the signal stack. */ 221 if (onstack) 222 l->l_sigstk.ss_flags |= SS_ONSTACK; 223 224 #ifdef DEBUG 225 if (sigdebug & SDB_FOLLOW) 226 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 227 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 228 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 229 printf("sendsig(%d): sig %d returns\n", 230 p->p_pid, sig); 231 #endif 232 } 233 234 #ifdef COMPAT_16 /* not needed if COMPAT_OSF1 only */ 235 /* 236 * System call to cleanup state after a signal 237 * has been taken. Reset signal mask and 238 * stack state from context left by sendsig (above). 239 * Return to previous pc and psl as specified by 240 * context left by sendsig. Check carefully to 241 * make sure that the user has not modified the 242 * psl to gain improper privileges or to cause 243 * a machine fault. 244 */ 245 /* ARGSUSED */ 246 int 247 compat_16_sys___sigreturn14(struct lwp *l, const struct compat_16_sys___sigreturn14_args *uap, register_t *retval) 248 { 249 /* { 250 syscallarg(struct sigcontext *) sigcntxp; 251 } */ 252 struct sigcontext *scp, ksc; 253 struct proc *p = l->l_proc; 254 struct pcb *pcb; 255 256 /* 257 * The trampoline code hands us the context. 258 * It is unsafe to keep track of it ourselves, in the event that a 259 * program jumps out of a signal handler. 260 */ 261 scp = SCARG(uap, sigcntxp); 262 #ifdef DEBUG 263 if (sigdebug & SDB_FOLLOW) 264 printf("sigreturn: pid %d, scp %p\n", p->p_pid, scp); 265 #endif 266 if (ALIGN(scp) != (u_int64_t)scp) 267 return (EINVAL); 268 269 if (copyin((void *)scp, &ksc, sizeof(ksc)) != 0) 270 return (EFAULT); 271 272 if (ksc.sc_regs[R_ZERO] != 0xACEDBADE) /* magic number */ 273 return (EINVAL); 274 275 /* Restore register context. */ 276 l->l_md.md_tf->tf_regs[FRAME_PC] = ksc.sc_pc; 277 l->l_md.md_tf->tf_regs[FRAME_PS] = 278 (ksc.sc_ps | ALPHA_PSL_USERSET) & ~ALPHA_PSL_USERCLR; 279 280 regtoframe((struct reg *)ksc.sc_regs, l->l_md.md_tf); 281 alpha_pal_wrusp(ksc.sc_regs[R_SP]); 282 283 pcb = lwp_getpcb(l); 284 fpu_discard(); 285 memcpy(&pcb->pcb_fp, (struct fpreg *)ksc.sc_fpregs, 286 sizeof(struct fpreg)); 287 pcb->pcb_fp.fpr_cr = ksc.sc_fpcr; 288 l->l_md.md_flags = (ksc.sc_fp_control & MDLWP_FP_C) 289 | (ksc.sc_ownedfp ? MDLWP_FPUSED : 0); 290 291 mutex_enter(p->p_lock); 292 /* Restore signal stack. */ 293 if (ksc.sc_onstack & SS_ONSTACK) 294 l->l_sigstk.ss_flags |= SS_ONSTACK; 295 else 296 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 297 /* Restore signal mask. */ 298 (void) sigprocmask1(l, SIG_SETMASK, &ksc.sc_mask, 0); 299 mutex_exit(p->p_lock); 300 301 #ifdef DEBUG 302 if (sigdebug & SDB_FOLLOW) 303 printf("sigreturn(%d): returns\n", p->p_pid); 304 #endif 305 return (EJUSTRETURN); 306 } 307 #endif /* COMPAT_16 */ 308