1 /* $NetBSD: compat_16_machdep.c,v 1.11 2007/03/04 05:59:08 christos 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University. 42 * All rights reserved. 43 * 44 * Author: Chris G. Demetriou 45 * 46 * Permission to use, copy, modify and distribute this software and 47 * its documentation is hereby granted, provided that both the copyright 48 * notice and this permission notice appear in all copies of the 49 * software, derivative works or modified versions, and any portions 50 * thereof, and that both notices appear in supporting documentation. 51 * 52 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 53 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 54 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 55 * 56 * Carnegie Mellon requests users of this software to return to 57 * 58 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 59 * School of Computer Science 60 * Carnegie Mellon University 61 * Pittsburgh PA 15213-3890 62 * 63 * any improvements or extensions that they make and grant Carnegie the 64 * rights to redistribute these changes. 65 */ 66 67 #include "opt_ddb.h" 68 #include "opt_kgdb.h" 69 #include "opt_multiprocessor.h" 70 #include "opt_dec_3000_300.h" 71 #include "opt_dec_3000_500.h" 72 #include "opt_compat_osf1.h" 73 #include "opt_compat_netbsd.h" 74 #include "opt_execfmt.h" 75 76 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 77 #include <sys/types.h> 78 #include <sys/param.h> 79 #include <sys/signal.h> 80 #include <sys/mount.h> 81 #include <sys/proc.h> 82 #include <sys/systm.h> 83 #include <sys/syscall.h> 84 #include <sys/syscallargs.h> 85 #include <sys/user.h> 86 87 #if defined(COMPAT_13) || defined(COMPAT_OSF1) 88 #include <compat/sys/signal.h> 89 #include <compat/sys/signalvar.h> 90 #endif 91 92 #include <machine/cpu.h> 93 #include <machine/reg.h> 94 95 __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.11 2007/03/04 05:59:08 christos Exp $"); 96 97 98 #ifdef DEBUG 99 #include <machine/sigdebug.h> 100 #endif 101 102 #include <machine/alpha.h> 103 104 #include "ksyms.h" 105 106 /* 107 * Send an interrupt to process, old style 108 */ 109 void 110 sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) 111 { 112 struct lwp *l = curlwp; 113 struct proc *p = l->l_proc; 114 struct sigacts *ps = p->p_sigacts; 115 int onstack, sig = ksi->ksi_signo, error; 116 struct sigframe_sigcontext *fp, frame; 117 struct trapframe *tf; 118 sig_t catcher = SIGACTION(p, sig).sa_handler; 119 120 tf = l->l_md.md_tf; 121 fp = getframe(l, sig, &onstack), frame; 122 fp--; 123 124 #ifdef DEBUG 125 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 126 printf("sendsig_sigcontext(%d): sig %d ssp %p usp %p\n", 127 p->p_pid, sig, &onstack, fp); 128 #endif 129 130 /* Build stack frame for signal trampoline. */ 131 frame.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 132 frame.sf_sc.sc_ps = tf->tf_regs[FRAME_PS]; 133 134 /* Save register context. */ 135 frametoreg(tf, (struct reg *)frame.sf_sc.sc_regs); 136 frame.sf_sc.sc_regs[R_ZERO] = 0xACEDBADE; /* magic number */ 137 frame.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 138 139 /* save the floating-point state, if necessary, then copy it. */ 140 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 141 fpusave_proc(l, 1); 142 frame.sf_sc.sc_ownedfp = l->l_md.md_flags & MDP_FPUSED; 143 memcpy((struct fpreg *)frame.sf_sc.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 144 sizeof(struct fpreg)); 145 frame.sf_sc.sc_fp_control = alpha_read_fp_c(l); 146 memset(frame.sf_sc.sc_reserved, 0, sizeof frame.sf_sc.sc_reserved); 147 memset(frame.sf_sc.sc_xxx, 0, sizeof frame.sf_sc.sc_xxx); /* XXX */ 148 149 /* Save signal stack. */ 150 frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; 151 152 /* Save signal mask. */ 153 frame.sf_sc.sc_mask = *mask; 154 155 #if defined(COMPAT_13) || defined(COMPAT_OSF1) 156 /* 157 * XXX We always have to save an old style signal mask because 158 * XXX we might be delivering a signal to a process which will 159 * XXX escape from the signal in a non-standard way and invoke 160 * XXX sigreturn() directly. 161 */ 162 { 163 /* Note: it's a long in the stack frame. */ 164 sigset13_t mask13; 165 166 native_sigset_to_sigset13(mask, &mask13); 167 frame.sf_sc.__sc_mask13 = mask13; 168 } 169 #endif 170 171 sendsig_reset(l, sig); 172 mutex_exit(&p->p_smutex); 173 error = copyout(&frame, (void *)fp, sizeof(frame)); 174 mutex_enter(&p->p_smutex); 175 176 if (error != 0) { 177 /* 178 * Process has trashed its stack; give it an illegal 179 * instruction to halt it in its tracks. 180 */ 181 #ifdef DEBUG 182 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 183 printf("sendsig_sigcontext(%d): copyout failed on sig %d\n", 184 p->p_pid, sig); 185 #endif 186 sigexit(l, SIGILL); 187 /* NOTREACHED */ 188 } 189 #ifdef DEBUG 190 if (sigdebug & SDB_FOLLOW) 191 printf("sendsig_sigcontext(%d): sig %d usp %p code %x\n", 192 p->p_pid, sig, fp, ksi->ksi_code); 193 #endif 194 195 /* 196 * Set up the registers to directly invoke the signal handler. The 197 * signal trampoline is then used to return from the signal. Note 198 * the trampoline version numbers are coordinated with machine- 199 * dependent code in libc. 200 */ 201 switch (ps->sa_sigdesc[sig].sd_vers) { 202 case 0: /* legacy on-stack sigtramp */ 203 buildcontext(l,(void *)catcher, 204 (void *)p->p_sigctx.ps_sigcode, 205 (void *)fp); 206 break; 207 #ifdef COMPAT_16 208 case 1: 209 buildcontext(l,(void *)catcher, 210 (const void *)ps->sa_sigdesc[sig].sd_tramp, 211 (void *)fp); 212 break; 213 #endif 214 default: 215 /* Don't know what trampoline version; kill it. */ 216 sigexit(l, SIGILL); 217 } 218 219 /* sigcontext specific trap frame */ 220 tf->tf_regs[FRAME_A0] = sig; 221 222 /* tf->tf_regs[FRAME_A1] = ksi->ksi_code; */ 223 tf->tf_regs[FRAME_A1] = KSI_TRAPCODE(ksi); 224 tf->tf_regs[FRAME_A2] = (u_int64_t)&fp->sf_sc; 225 226 /* Remember that we're now on the signal stack. */ 227 if (onstack) 228 l->l_sigstk.ss_flags |= SS_ONSTACK; 229 230 #ifdef DEBUG 231 if (sigdebug & SDB_FOLLOW) 232 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 233 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 234 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 235 printf("sendsig(%d): sig %d returns\n", 236 p->p_pid, sig); 237 #endif 238 } 239 240 #ifdef COMPAT_16 /* not needed if COMPAT_OSF1 only */ 241 /* 242 * System call to cleanup state after a signal 243 * has been taken. Reset signal mask and 244 * stack state from context left by sendsig (above). 245 * Return to previous pc and psl as specified by 246 * context left by sendsig. Check carefully to 247 * make sure that the user has not modified the 248 * psl to gain improper privileges or to cause 249 * a machine fault. 250 */ 251 /* ARGSUSED */ 252 int 253 compat_16_sys___sigreturn14(l, v, retval) 254 struct lwp *l; 255 void *v; 256 register_t *retval; 257 { 258 struct compat_16_sys___sigreturn14_args /* { 259 syscallarg(struct sigcontext *) sigcntxp; 260 } */ *uap = v; 261 struct sigcontext *scp, ksc; 262 struct proc *p = l->l_proc; 263 264 /* 265 * The trampoline code hands us the context. 266 * It is unsafe to keep track of it ourselves, in the event that a 267 * program jumps out of a signal handler. 268 */ 269 scp = SCARG(uap, sigcntxp); 270 #ifdef DEBUG 271 if (sigdebug & SDB_FOLLOW) 272 printf("sigreturn: pid %d, scp %p\n", p->p_pid, scp); 273 #endif 274 if (ALIGN(scp) != (u_int64_t)scp) 275 return (EINVAL); 276 277 if (copyin((void *)scp, &ksc, sizeof(ksc)) != 0) 278 return (EFAULT); 279 280 if (ksc.sc_regs[R_ZERO] != 0xACEDBADE) /* magic number */ 281 return (EINVAL); 282 283 /* Restore register context. */ 284 l->l_md.md_tf->tf_regs[FRAME_PC] = ksc.sc_pc; 285 l->l_md.md_tf->tf_regs[FRAME_PS] = 286 (ksc.sc_ps | ALPHA_PSL_USERSET) & ~ALPHA_PSL_USERCLR; 287 288 regtoframe((struct reg *)ksc.sc_regs, l->l_md.md_tf); 289 alpha_pal_wrusp(ksc.sc_regs[R_SP]); 290 291 /* XXX ksc.sc_ownedfp ? */ 292 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 293 fpusave_proc(l, 0); 294 memcpy(&l->l_addr->u_pcb.pcb_fp, (struct fpreg *)ksc.sc_fpregs, 295 sizeof(struct fpreg)); 296 l->l_addr->u_pcb.pcb_fp.fpr_cr = ksc.sc_fpcr; 297 l->l_md.md_flags = ksc.sc_fp_control & MDP_FP_C; 298 299 mutex_enter(&p->p_smutex); 300 /* Restore signal stack. */ 301 if (ksc.sc_onstack & SS_ONSTACK) 302 l->l_sigstk.ss_flags |= SS_ONSTACK; 303 else 304 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 305 /* Restore signal mask. */ 306 (void) sigprocmask1(l, SIG_SETMASK, &ksc.sc_mask, 0); 307 mutex_exit(&p->p_smutex); 308 309 #ifdef DEBUG 310 if (sigdebug & SDB_FOLLOW) 311 printf("sigreturn(%d): returns\n", p->p_pid); 312 #endif 313 return (EJUSTRETURN); 314 } 315 #endif /* COMPAT_16 */ 316