1 /* $NetBSD: compat_16_machdep.c,v 1.22 2019/03/25 19:24:30 maxv 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_netbsd.h" 67 #include "opt_execfmt.h" 68 #endif /* _KERNEL_OPT */ 69 70 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 71 #include <sys/types.h> 72 #include <sys/param.h> 73 #include <sys/signal.h> 74 #include <sys/mount.h> 75 #include <sys/proc.h> 76 #include <sys/systm.h> 77 #include <sys/syscall.h> 78 #include <sys/syscallargs.h> 79 80 #if defined(COMPAT_13) 81 #include <compat/sys/signal.h> 82 #include <compat/sys/signalvar.h> 83 #endif 84 85 #include <machine/cpu.h> 86 #include <machine/reg.h> 87 88 __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.22 2019/03/25 19:24:30 maxv Exp $"); 89 90 91 #ifdef DEBUG 92 #include <machine/sigdebug.h> 93 #endif 94 95 #include <machine/alpha.h> 96 97 #include <sys/ksyms.h> 98 99 /* 100 * Send an interrupt to process, old style 101 */ 102 void 103 sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) 104 { 105 struct lwp *l = curlwp; 106 struct proc *p = l->l_proc; 107 struct pcb *pcb = lwp_getpcb(l); 108 struct sigacts *ps = p->p_sigacts; 109 int onstack, sig = ksi->ksi_signo, error; 110 struct sigframe_sigcontext *fp, frame; 111 struct trapframe *tf; 112 sig_t catcher = SIGACTION(p, sig).sa_handler; 113 114 tf = l->l_md.md_tf; 115 fp = getframe(l, sig, &onstack); 116 fp--; 117 118 #ifdef DEBUG 119 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 120 printf("sendsig_sigcontext(%d): sig %d ssp %p usp %p\n", 121 p->p_pid, sig, &onstack, fp); 122 #endif 123 124 /* Build stack frame for signal trampoline. */ 125 frame.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 126 frame.sf_sc.sc_ps = tf->tf_regs[FRAME_PS]; 127 128 /* Save register context. */ 129 frametoreg(tf, (struct reg *)frame.sf_sc.sc_regs); 130 frame.sf_sc.sc_regs[R_ZERO] = 0xACEDBADE; /* magic number */ 131 frame.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 132 133 /* save the floating-point state, if necessary, then copy it. */ 134 fpu_save(l); 135 frame.sf_sc.sc_ownedfp = fpu_valid_p(l); 136 memcpy((struct fpreg *)frame.sf_sc.sc_fpregs, &pcb->pcb_fp, 137 sizeof(struct fpreg)); 138 frame.sf_sc.sc_fp_control = alpha_read_fp_c(l); 139 memset(frame.sf_sc.sc_reserved, 0, sizeof frame.sf_sc.sc_reserved); 140 memset(frame.sf_sc.sc_xxx, 0, sizeof frame.sf_sc.sc_xxx); /* XXX */ 141 142 /* Save signal stack. */ 143 frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; 144 145 /* Save signal mask. */ 146 frame.sf_sc.sc_mask = *mask; 147 148 #if defined(COMPAT_13) 149 /* 150 * XXX We always have to save an old style signal mask because 151 * XXX we might be delivering a signal to a process which will 152 * XXX escape from the signal in a non-standard way and invoke 153 * XXX sigreturn() directly. 154 */ 155 { 156 /* Note: it's a long in the stack frame. */ 157 sigset13_t mask13; 158 159 native_sigset_to_sigset13(mask, &mask13); 160 frame.sf_sc.__sc_mask13 = mask13; 161 } 162 #endif 163 164 sendsig_reset(l, sig); 165 mutex_exit(p->p_lock); 166 error = copyout(&frame, (void *)fp, sizeof(frame)); 167 mutex_enter(p->p_lock); 168 169 if (error != 0) { 170 /* 171 * Process has trashed its stack; give it an illegal 172 * instruction to halt it in its tracks. 173 */ 174 #ifdef DEBUG 175 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 176 printf("sendsig_sigcontext(%d): copyout failed on sig %d\n", 177 p->p_pid, sig); 178 #endif 179 sigexit(l, SIGILL); 180 /* NOTREACHED */ 181 } 182 #ifdef DEBUG 183 if (sigdebug & SDB_FOLLOW) 184 printf("sendsig_sigcontext(%d): sig %d usp %p code %x\n", 185 p->p_pid, sig, fp, ksi->ksi_code); 186 #endif 187 188 /* 189 * Set up the registers to directly invoke the signal handler. The 190 * signal trampoline is then used to return from the signal. Note 191 * the trampoline version numbers are coordinated with machine- 192 * dependent code in libc. 193 */ 194 switch (ps->sa_sigdesc[sig].sd_vers) { 195 case 0: /* legacy on-stack sigtramp */ 196 buildcontext(l,(void *)catcher, 197 (void *)p->p_sigctx.ps_sigcode, 198 (void *)fp); 199 break; 200 #ifdef COMPAT_16 201 case 1: 202 buildcontext(l,(void *)catcher, 203 (const void *)ps->sa_sigdesc[sig].sd_tramp, 204 (void *)fp); 205 break; 206 #endif 207 default: 208 /* Don't know what trampoline version; kill it. */ 209 sigexit(l, SIGILL); 210 } 211 212 /* sigcontext specific trap frame */ 213 tf->tf_regs[FRAME_A0] = sig; 214 215 /* tf->tf_regs[FRAME_A1] = ksi->ksi_code; */ 216 tf->tf_regs[FRAME_A1] = KSI_TRAPCODE(ksi); 217 tf->tf_regs[FRAME_A2] = (uint64_t)&fp->sf_sc; 218 219 /* Remember that we're now on the signal stack. */ 220 if (onstack) 221 l->l_sigstk.ss_flags |= SS_ONSTACK; 222 223 #ifdef DEBUG 224 if (sigdebug & SDB_FOLLOW) 225 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 226 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 227 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 228 printf("sendsig(%d): sig %d returns\n", 229 p->p_pid, sig); 230 #endif 231 } 232 233 #ifdef COMPAT_16 234 /* 235 * System call to cleanup state after a signal 236 * has been taken. Reset signal mask and 237 * stack state from context left by sendsig (above). 238 * Return to previous pc and psl as specified by 239 * context left by sendsig. Check carefully to 240 * make sure that the user has not modified the 241 * psl to gain improper privileges or to cause 242 * a machine fault. 243 */ 244 /* ARGSUSED */ 245 int 246 compat_16_sys___sigreturn14(struct lwp *l, const struct compat_16_sys___sigreturn14_args *uap, register_t *retval) 247 { 248 /* { 249 syscallarg(struct sigcontext *) sigcntxp; 250 } */ 251 struct sigcontext *scp, ksc; 252 struct proc *p = l->l_proc; 253 struct pcb *pcb; 254 255 /* 256 * The trampoline code hands us the context. 257 * It is unsafe to keep track of it ourselves, in the event that a 258 * program jumps out of a signal handler. 259 */ 260 scp = SCARG(uap, sigcntxp); 261 #ifdef DEBUG 262 if (sigdebug & SDB_FOLLOW) 263 printf("sigreturn: pid %d, scp %p\n", p->p_pid, scp); 264 #endif 265 if (ALIGN(scp) != (uint64_t)scp) 266 return (EINVAL); 267 268 if (copyin((void *)scp, &ksc, sizeof(ksc)) != 0) 269 return (EFAULT); 270 271 if (ksc.sc_regs[R_ZERO] != 0xACEDBADE) /* magic number */ 272 return (EINVAL); 273 274 /* Restore register context. */ 275 l->l_md.md_tf->tf_regs[FRAME_PC] = ksc.sc_pc; 276 l->l_md.md_tf->tf_regs[FRAME_PS] = 277 (ksc.sc_ps | ALPHA_PSL_USERSET) & ~ALPHA_PSL_USERCLR; 278 279 regtoframe((struct reg *)ksc.sc_regs, l->l_md.md_tf); 280 alpha_pal_wrusp(ksc.sc_regs[R_SP]); 281 282 pcb = lwp_getpcb(l); 283 fpu_discard(l, true); 284 memcpy(&pcb->pcb_fp, (struct fpreg *)ksc.sc_fpregs, 285 sizeof(struct fpreg)); 286 pcb->pcb_fp.fpr_cr = ksc.sc_fpcr; 287 l->l_md.md_flags = ksc.sc_fp_control & MDLWP_FP_C; 288 289 mutex_enter(p->p_lock); 290 /* Restore signal stack. */ 291 if (ksc.sc_onstack & SS_ONSTACK) 292 l->l_sigstk.ss_flags |= SS_ONSTACK; 293 else 294 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 295 /* Restore signal mask. */ 296 (void) sigprocmask1(l, SIG_SETMASK, &ksc.sc_mask, 0); 297 mutex_exit(p->p_lock); 298 299 #ifdef DEBUG 300 if (sigdebug & SDB_FOLLOW) 301 printf("sigreturn(%d): returns\n", p->p_pid); 302 #endif 303 return (EJUSTRETURN); 304 } 305 #endif /* COMPAT_16 */ 306