1 /* $NetBSD: compat_16_machdep.c,v 1.3 2003/10/13 22:19:15 nathanw 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 #include <machine/cpu.h> 89 #include <machine/reg.h> 90 91 __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.3 2003/10/13 22:19:15 nathanw Exp $"); 92 93 94 #ifdef DEBUG 95 #include <machine/sigdebug.h> 96 #endif 97 98 #include <machine/alpha.h> 99 100 #include "ksyms.h" 101 102 /* 103 * Send an interrupt to process, old style 104 */ 105 #ifdef COMPAT_16 106 void 107 sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) 108 { 109 struct lwp *l = curlwp; 110 struct proc *p = l->l_proc; 111 struct sigacts *ps = p->p_sigacts; 112 int onstack, sig = ksi->ksi_signo; 113 struct sigframe_sigcontext *fp, frame; 114 struct trapframe *tf; 115 sig_t catcher = SIGACTION(p, sig).sa_handler; 116 117 tf = l->l_md.md_tf; 118 fp = getframe(l, sig, &onstack), frame; 119 fp--; 120 121 #ifdef DEBUG 122 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 123 printf("sendsig_sigcontext(%d): sig %d ssp %p usp %p\n", 124 p->p_pid, sig, &onstack, fp); 125 #endif 126 127 /* Build stack frame for signal trampoline. */ 128 frame.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 129 frame.sf_sc.sc_ps = tf->tf_regs[FRAME_PS]; 130 131 /* Save register context. */ 132 frametoreg(tf, (struct reg *)frame.sf_sc.sc_regs); 133 frame.sf_sc.sc_regs[R_ZERO] = 0xACEDBADE; /* magic number */ 134 frame.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 135 136 /* save the floating-point state, if necessary, then copy it. */ 137 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 138 fpusave_proc(l, 1); 139 frame.sf_sc.sc_ownedfp = l->l_md.md_flags & MDP_FPUSED; 140 memcpy((struct fpreg *)frame.sf_sc.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 141 sizeof(struct fpreg)); 142 frame.sf_sc.sc_fp_control = alpha_read_fp_c(l); 143 memset(frame.sf_sc.sc_reserved, 0, sizeof frame.sf_sc.sc_reserved); 144 memset(frame.sf_sc.sc_xxx, 0, sizeof frame.sf_sc.sc_xxx); /* XXX */ 145 146 /* Save signal stack. */ 147 frame.sf_sc.sc_onstack = p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK; 148 149 /* Save signal mask. */ 150 frame.sf_sc.sc_mask = *mask; 151 152 #ifdef COMPAT_13 153 /* 154 * XXX We always have to save an old style signal mask because 155 * XXX we might be delivering a signal to a process which will 156 * XXX escape from the signal in a non-standard way and invoke 157 * XXX sigreturn() directly. 158 */ 159 { 160 /* Note: it's a long in the stack frame. */ 161 sigset13_t mask13; 162 163 native_sigset_to_sigset13(mask, &mask13); 164 frame.sf_sc.__sc_mask13 = mask13; 165 } 166 #endif 167 168 #ifdef COMPAT_OSF1 169 /* 170 * XXX Create an OSF/1-style sigcontext and associated goo. 171 */ 172 #endif 173 174 if (copyout(&frame, (caddr_t)fp, sizeof(frame)) != 0) { 175 /* 176 * Process has trashed its stack; give it an illegal 177 * instruction to halt it in its tracks. 178 */ 179 #ifdef DEBUG 180 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 181 printf("sendsig_sigcontext(%d): copyout failed on sig %d\n", 182 p->p_pid, sig); 183 #endif 184 sigexit(l, SIGILL); 185 /* NOTREACHED */ 186 } 187 #ifdef DEBUG 188 if (sigdebug & SDB_FOLLOW) 189 printf("sendsig_sigcontext(%d): sig %d usp %p code %x\n", 190 p->p_pid, sig, fp, ksi->ksi_code); 191 #endif 192 193 /* 194 * Set up the registers to directly invoke the signal handler. The 195 * signal trampoline is then used to return from the signal. Note 196 * the trampoline version numbers are coordinated with machine- 197 * dependent code in libc. 198 */ 199 switch (ps->sa_sigdesc[sig].sd_vers) { 200 case 0: /* legacy on-stack sigtramp */ 201 buildcontext(l,(void *)catcher, 202 (void *)p->p_sigctx.ps_sigcode, 203 (void *)fp); 204 break; 205 case 1: 206 buildcontext(l,(void *)catcher, 207 (void *)ps->sa_sigdesc[sig].sd_tramp, 208 (void *)fp); 209 break; 210 211 default: 212 /* Don't know what trampoline version; kill it. */ 213 sigexit(l, SIGILL); 214 } 215 216 /* sigcontext specific trap frame */ 217 tf->tf_regs[FRAME_A0] = sig; 218 219 /* tf->tf_regs[FRAME_A1] = ksi->ksi_code; */ 220 tf->tf_regs[FRAME_A1] = KSI_TRAPCODE(ksi); 221 tf->tf_regs[FRAME_A2] = (u_int64_t)&fp->sf_sc; 222 223 /* Remember that we're now on the signal stack. */ 224 if (onstack) 225 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 226 227 #ifdef DEBUG 228 if (sigdebug & SDB_FOLLOW) 229 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 230 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 231 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 232 printf("sendsig(%d): sig %d returns\n", 233 p->p_pid, sig); 234 #endif 235 } 236 #endif /* COMPAT_16 */ 237 #ifdef COMPAT_16 238 /* 239 * System call to cleanup state after a signal 240 * has been taken. Reset signal mask and 241 * stack state from context left by sendsig (above). 242 * Return to previous pc and psl as specified by 243 * context left by sendsig. Check carefully to 244 * make sure that the user has not modified the 245 * psl to gain improper privileges or to cause 246 * a machine fault. 247 */ 248 /* ARGSUSED */ 249 int 250 compat_16_sys___sigreturn14(l, v, retval) 251 struct lwp *l; 252 void *v; 253 register_t *retval; 254 { 255 struct compat_16_sys___sigreturn14_args /* { 256 syscallarg(struct sigcontext *) sigcntxp; 257 } */ *uap = v; 258 struct sigcontext *scp, ksc; 259 struct proc *p = l->l_proc; 260 261 /* 262 * The trampoline code hands us the context. 263 * It is unsafe to keep track of it ourselves, in the event that a 264 * program jumps out of a signal handler. 265 */ 266 scp = SCARG(uap, sigcntxp); 267 #ifdef DEBUG 268 if (sigdebug & SDB_FOLLOW) 269 printf("sigreturn: pid %d, scp %p\n", p->p_pid, scp); 270 #endif 271 if (ALIGN(scp) != (u_int64_t)scp) 272 return (EINVAL); 273 274 if (copyin((caddr_t)scp, &ksc, sizeof(ksc)) != 0) 275 return (EFAULT); 276 277 if (ksc.sc_regs[R_ZERO] != 0xACEDBADE) /* magic number */ 278 return (EINVAL); 279 280 /* Restore register context. */ 281 l->l_md.md_tf->tf_regs[FRAME_PC] = ksc.sc_pc; 282 l->l_md.md_tf->tf_regs[FRAME_PS] = 283 (ksc.sc_ps | ALPHA_PSL_USERSET) & ~ALPHA_PSL_USERCLR; 284 285 regtoframe((struct reg *)ksc.sc_regs, l->l_md.md_tf); 286 alpha_pal_wrusp(ksc.sc_regs[R_SP]); 287 288 /* XXX ksc.sc_ownedfp ? */ 289 if (l->l_addr->u_pcb.pcb_fpcpu != NULL) 290 fpusave_proc(l, 0); 291 memcpy(&l->l_addr->u_pcb.pcb_fp, (struct fpreg *)ksc.sc_fpregs, 292 sizeof(struct fpreg)); 293 l->l_addr->u_pcb.pcb_fp.fpr_cr = ksc.sc_fpcr; 294 l->l_md.md_flags = ksc.sc_fp_control & MDP_FP_C; 295 296 /* Restore signal stack. */ 297 if (ksc.sc_onstack & SS_ONSTACK) 298 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 299 else 300 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 301 302 /* Restore signal mask. */ 303 (void) sigprocmask1(p, SIG_SETMASK, &ksc.sc_mask, 0); 304 305 #ifdef DEBUG 306 if (sigdebug & SDB_FOLLOW) 307 printf("sigreturn(%d): returns\n", p->p_pid); 308 #endif 309 return (EJUSTRETURN); 310 } 311 #endif /* COMPAT_16 */ 312