1 /* $NetBSD: compat_16_machdep.c,v 1.8 2005/09/14 21:48:14 he 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/sa.h> 83 #include <sys/systm.h> 84 #include <sys/syscall.h> 85 #include <sys/syscallargs.h> 86 #include <sys/user.h> 87 88 #if defined(COMPAT_13) || defined(COMPAT_OSF1) 89 #include <compat/sys/signal.h> 90 #include <compat/sys/signalvar.h> 91 #endif 92 93 #include <machine/cpu.h> 94 #include <machine/reg.h> 95 96 __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.8 2005/09/14 21:48:14 he Exp $"); 97 98 99 #ifdef DEBUG 100 #include <machine/sigdebug.h> 101 #endif 102 103 #include <machine/alpha.h> 104 105 #include "ksyms.h" 106 107 /* 108 * Send an interrupt to process, old style 109 */ 110 void 111 sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) 112 { 113 struct lwp *l = curlwp; 114 struct proc *p = l->l_proc; 115 struct sigacts *ps = p->p_sigacts; 116 int onstack, sig = ksi->ksi_signo; 117 struct sigframe_sigcontext *fp, frame; 118 struct trapframe *tf; 119 sig_t catcher = SIGACTION(p, sig).sa_handler; 120 121 tf = l->l_md.md_tf; 122 fp = getframe(l, sig, &onstack), frame; 123 fp--; 124 125 #ifdef DEBUG 126 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 127 printf("sendsig_sigcontext(%d): sig %d ssp %p usp %p\n", 128 p->p_pid, sig, &onstack, fp); 129 #endif 130 131 /* Build stack frame for signal trampoline. */ 132 frame.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 133 frame.sf_sc.sc_ps = tf->tf_regs[FRAME_PS]; 134 135 /* Save register context. */ 136 frametoreg(tf, (struct reg *)frame.sf_sc.sc_regs); 137 frame.sf_sc.sc_regs[R_ZERO] = 0xACEDBADE; /* magic number */ 138 frame.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 139 140 /* save the floating-point state, if necessary, then copy it. */ 141 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 142 fpusave_proc(l, 1); 143 frame.sf_sc.sc_ownedfp = l->l_md.md_flags & MDP_FPUSED; 144 memcpy((struct fpreg *)frame.sf_sc.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 145 sizeof(struct fpreg)); 146 frame.sf_sc.sc_fp_control = alpha_read_fp_c(l); 147 memset(frame.sf_sc.sc_reserved, 0, sizeof frame.sf_sc.sc_reserved); 148 memset(frame.sf_sc.sc_xxx, 0, sizeof frame.sf_sc.sc_xxx); /* XXX */ 149 150 /* Save signal stack. */ 151 frame.sf_sc.sc_onstack = p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK; 152 153 /* Save signal mask. */ 154 frame.sf_sc.sc_mask = *mask; 155 156 #if defined(COMPAT_13) || defined(COMPAT_OSF1) 157 /* 158 * XXX We always have to save an old style signal mask because 159 * XXX we might be delivering a signal to a process which will 160 * XXX escape from the signal in a non-standard way and invoke 161 * XXX sigreturn() directly. 162 */ 163 { 164 /* Note: it's a long in the stack frame. */ 165 sigset13_t mask13; 166 167 native_sigset_to_sigset13(mask, &mask13); 168 frame.sf_sc.__sc_mask13 = mask13; 169 } 170 #endif 171 172 if (copyout(&frame, (caddr_t)fp, sizeof(frame)) != 0) { 173 /* 174 * Process has trashed its stack; give it an illegal 175 * instruction to halt it in its tracks. 176 */ 177 #ifdef DEBUG 178 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 179 printf("sendsig_sigcontext(%d): copyout failed on sig %d\n", 180 p->p_pid, sig); 181 #endif 182 sigexit(l, SIGILL); 183 /* NOTREACHED */ 184 } 185 #ifdef DEBUG 186 if (sigdebug & SDB_FOLLOW) 187 printf("sendsig_sigcontext(%d): sig %d usp %p code %x\n", 188 p->p_pid, sig, fp, ksi->ksi_code); 189 #endif 190 191 /* 192 * Set up the registers to directly invoke the signal handler. The 193 * signal trampoline is then used to return from the signal. Note 194 * the trampoline version numbers are coordinated with machine- 195 * dependent code in libc. 196 */ 197 switch (ps->sa_sigdesc[sig].sd_vers) { 198 case 0: /* legacy on-stack sigtramp */ 199 buildcontext(l,(void *)catcher, 200 (void *)p->p_sigctx.ps_sigcode, 201 (void *)fp); 202 break; 203 #ifdef COMPAT_16 204 case 1: 205 buildcontext(l,(void *)catcher, 206 (const void *)ps->sa_sigdesc[sig].sd_tramp, 207 (void *)fp); 208 break; 209 #endif 210 default: 211 /* Don't know what trampoline version; kill it. */ 212 sigexit(l, SIGILL); 213 } 214 215 /* sigcontext specific trap frame */ 216 tf->tf_regs[FRAME_A0] = sig; 217 218 /* tf->tf_regs[FRAME_A1] = ksi->ksi_code; */ 219 tf->tf_regs[FRAME_A1] = KSI_TRAPCODE(ksi); 220 tf->tf_regs[FRAME_A2] = (u_int64_t)&fp->sf_sc; 221 222 /* Remember that we're now on the signal stack. */ 223 if (onstack) 224 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 225 226 #ifdef DEBUG 227 if (sigdebug & SDB_FOLLOW) 228 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 229 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 230 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 231 printf("sendsig(%d): sig %d returns\n", 232 p->p_pid, sig); 233 #endif 234 } 235 236 #ifdef COMPAT_16 /* not needed if COMPAT_OSF1 only */ 237 /* 238 * System call to cleanup state after a signal 239 * has been taken. Reset signal mask and 240 * stack state from context left by sendsig (above). 241 * Return to previous pc and psl as specified by 242 * context left by sendsig. Check carefully to 243 * make sure that the user has not modified the 244 * psl to gain improper privileges or to cause 245 * a machine fault. 246 */ 247 /* ARGSUSED */ 248 int 249 compat_16_sys___sigreturn14(l, v, retval) 250 struct lwp *l; 251 void *v; 252 register_t *retval; 253 { 254 struct compat_16_sys___sigreturn14_args /* { 255 syscallarg(struct sigcontext *) sigcntxp; 256 } */ *uap = v; 257 struct sigcontext *scp, ksc; 258 struct proc *p = l->l_proc; 259 260 /* 261 * The trampoline code hands us the context. 262 * It is unsafe to keep track of it ourselves, in the event that a 263 * program jumps out of a signal handler. 264 */ 265 scp = SCARG(uap, sigcntxp); 266 #ifdef DEBUG 267 if (sigdebug & SDB_FOLLOW) 268 printf("sigreturn: pid %d, scp %p\n", p->p_pid, scp); 269 #endif 270 if (ALIGN(scp) != (u_int64_t)scp) 271 return (EINVAL); 272 273 if (copyin((caddr_t)scp, &ksc, sizeof(ksc)) != 0) 274 return (EFAULT); 275 276 if (ksc.sc_regs[R_ZERO] != 0xACEDBADE) /* magic number */ 277 return (EINVAL); 278 279 /* Restore register context. */ 280 l->l_md.md_tf->tf_regs[FRAME_PC] = ksc.sc_pc; 281 l->l_md.md_tf->tf_regs[FRAME_PS] = 282 (ksc.sc_ps | ALPHA_PSL_USERSET) & ~ALPHA_PSL_USERCLR; 283 284 regtoframe((struct reg *)ksc.sc_regs, l->l_md.md_tf); 285 alpha_pal_wrusp(ksc.sc_regs[R_SP]); 286 287 /* XXX ksc.sc_ownedfp ? */ 288 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 289 fpusave_proc(l, 0); 290 memcpy(&l->l_addr->u_pcb.pcb_fp, (struct fpreg *)ksc.sc_fpregs, 291 sizeof(struct fpreg)); 292 l->l_addr->u_pcb.pcb_fp.fpr_cr = ksc.sc_fpcr; 293 l->l_md.md_flags = ksc.sc_fp_control & MDP_FP_C; 294 295 /* Restore signal stack. */ 296 if (ksc.sc_onstack & SS_ONSTACK) 297 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 298 else 299 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 300 301 /* Restore signal mask. */ 302 (void) sigprocmask1(p, SIG_SETMASK, &ksc.sc_mask, 0); 303 304 #ifdef DEBUG 305 if (sigdebug & SDB_FOLLOW) 306 printf("sigreturn(%d): returns\n", p->p_pid); 307 #endif 308 return (EJUSTRETURN); 309 } 310 #endif /* COMPAT_16 */ 311