sig_machdep.c revision 1.7
1 /* $NetBSD: sig_machdep.c,v 1.7 2003/11/28 19:02:25 chs Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matthew Fredette. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1982, 1986, 1990, 1993 41 * The Regents of the University of California. All rights reserved. 42 * 43 * This code is derived from software contributed to Berkeley by 44 * the Systems Programming Group of the University of Utah Computer 45 * Science Department. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * from: Utah Hdr: machdep.c 1.74 92/12/20 72 * from: @(#)machdep.c 8.10 (Berkeley) 4/20/94 73 */ 74 /* 75 * Copyright (c) 1988 University of Utah. 76 * 77 * This code is derived from software contributed to Berkeley by 78 * the Systems Programming Group of the University of Utah Computer 79 * Science Department. 80 * 81 * Redistribution and use in source and binary forms, with or without 82 * modification, are permitted provided that the following conditions 83 * are met: 84 * 1. Redistributions of source code must retain the above copyright 85 * notice, this list of conditions and the following disclaimer. 86 * 2. Redistributions in binary form must reproduce the above copyright 87 * notice, this list of conditions and the following disclaimer in the 88 * documentation and/or other materials provided with the distribution. 89 * 3. All advertising materials mentioning features or use of this software 90 * must display the following acknowledgement: 91 * This product includes software developed by the University of 92 * California, Berkeley and its contributors. 93 * 4. Neither the name of the University nor the names of its contributors 94 * may be used to endorse or promote products derived from this software 95 * without specific prior written permission. 96 * 97 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 98 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 99 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 100 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 101 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 102 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 103 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 104 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 105 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 106 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 107 * SUCH DAMAGE. 108 * 109 * from: Utah Hdr: machdep.c 1.74 92/12/20 110 * from: @(#)machdep.c 8.10 (Berkeley) 4/20/94 111 */ 112 113 #include <sys/cdefs.h> 114 __KERNEL_RCSID(0, "$NetBSD: sig_machdep.c,v 1.7 2003/11/28 19:02:25 chs Exp $"); 115 116 #include "opt_compat_netbsd.h" 117 118 #define __HPPA_SIGNAL_PRIVATE 119 120 #include <sys/param.h> 121 #include <sys/systm.h> 122 #include <sys/kernel.h> 123 #include <sys/proc.h> 124 #include <sys/user.h> 125 #include <sys/signal.h> 126 #include <sys/signalvar.h> 127 128 #include <sys/mount.h> 129 #include <sys/sa.h> 130 #include <sys/syscallargs.h> 131 132 #include <machine/cpu.h> 133 #include <machine/reg.h> 134 135 #ifdef DEBUG 136 int sigdebug = 0xff; 137 int sigpid = 0; 138 #define SDB_FOLLOW 0x01 139 #define SDB_KSTACK 0x02 140 #define SDB_FPSTATE 0x04 141 #endif 142 143 /* 144 * Send an interrupt to process. 145 */ 146 void 147 sendsig(int sig, const sigset_t *mask, u_long code) 148 { 149 struct lwp *l = curlwp; 150 struct proc *p = l->l_proc; 151 struct sigacts *ps = p->p_sigacts; 152 struct sigframe *fp, kf; 153 caddr_t sp; 154 struct trapframe *tf; 155 int onstack, fsize; 156 sig_t catcher = SIGACTION(p, sig).sa_handler; 157 158 tf = (struct trapframe *)l->l_md.md_regs; 159 160 /* Do we need to jump onto the signal stack? */ 161 onstack = 162 (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 163 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 164 165 /* 166 * Allocate space for the signal handler context. 167 * The PA-RISC calling convention mandates that 168 * the stack pointer must always be 64-byte aligned, 169 * and points to the first *unused* byte. 170 */ 171 fsize = sizeof(struct sigframe); 172 sp = (onstack ? 173 (caddr_t)p->p_sigctx.ps_sigstk.ss_sp : 174 (caddr_t)tf->tf_sp); 175 sp = (caddr_t)(((u_int)(sp + fsize + 63)) & ~63); 176 fp = (struct sigframe *) (sp - fsize); 177 178 #ifdef DEBUG 179 if ((sigdebug & SDB_FOLLOW) && (!sigpid || p->p_pid == sigpid)) 180 printf("sendsig: %s[%d] sig %d catcher %p\n", 181 p->p_comm, p->p_pid, sig, catcher); 182 #endif 183 184 /* 185 * Save necessary hardware state. Currently this includes: 186 * - original exception frame 187 * - FP coprocessor state 188 */ 189 kf.sf_state.ss_flags = SS_USERREGS; 190 memcpy(&kf.sf_state.ss_frame, tf, sizeof(*tf)); 191 /* XXX FP state */ 192 193 /* Build the signal context to be used by sigreturn. */ 194 kf.sf_sc.sc_sp = tf->tf_sp; 195 kf.sf_sc.sc_fp = tf->tf_sp; /* XXX fredette - is this right? */ 196 kf.sf_sc.sc_ap = (int)&fp->sf_state; 197 kf.sf_sc.sc_pcsqh = tf->tf_iisq_head; 198 kf.sf_sc.sc_pcoqh = tf->tf_iioq_head; 199 kf.sf_sc.sc_pcsqt = tf->tf_iisq_tail; 200 kf.sf_sc.sc_pcoqt = tf->tf_iioq_tail; 201 kf.sf_sc.sc_ps = tf->tf_ipsw; 202 203 /* Save signal stack. */ 204 kf.sf_sc.sc_onstack = p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK; 205 206 /* Save signal mask. */ 207 kf.sf_sc.sc_mask = *mask; 208 209 /* Fill the calling convention part of the signal frame. */ 210 kf.sf_psp = 0; 211 kf.sf_clup = 0; /* XXX fredette - is this right? */ 212 kf.sf_sl = 0; /* XXX fredette - is this right? */ 213 kf.sf_edp = 0; /* XXX fredette - is this right? */ 214 215 /* Copy out the signal frame. */ 216 if (copyout(&kf, fp, fsize)) { 217 #ifdef DEBUG 218 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 219 printf("sendsig(%d): copyout failed on sig %d\n", 220 p->p_pid, sig); 221 #endif 222 /* 223 * Process has trashed its stack; give it an illegal 224 * instruction to halt it in its tracks. 225 */ 226 sigexit(l, SIGILL); 227 /* NOTREACHED */ 228 } 229 #ifdef DEBUG 230 if (sigdebug & SDB_FOLLOW) 231 printf("sendsig(%d): sig %d scp %p fp %p sc_sp %x sc_ap %x\n", 232 p->p_pid, sig, &fp->sf_sc, fp, 233 kf.sf_sc.sc_sp, kf.sf_sc.sc_ap); 234 #endif 235 236 /* Set up the registers to return to sigcode. */ 237 switch (ps->sa_sigdesc[sig].sd_vers) { 238 #if 1 /* COMPAT_16 */ 239 case 0: /* legacy on-stack sigtramp */ 240 tf->tf_iioq_head = 241 (int)p->p_sigctx.ps_sigcode | HPPA_PC_PRIV_USER; 242 tf->tf_iioq_tail = tf->tf_iioq_head + 4; 243 break; 244 #endif 245 246 case 1: 247 tf->tf_iioq_head = 248 (int)ps->sa_sigdesc[sig].sd_tramp | HPPA_PC_PRIV_USER; 249 tf->tf_iioq_tail = tf->tf_iioq_head + 4; 250 break; 251 252 default: 253 /* Don't know what trampoline version; kill it. */ 254 sigexit(l, SIGILL); 255 } 256 257 tf->tf_sp = (int)sp; 258 tf->tf_r3 = (int)&fp->sf_sc; 259 tf->tf_arg0 = sig; 260 tf->tf_arg1 = code; 261 tf->tf_arg2 = (int)&fp->sf_sc; 262 tf->tf_arg3 = (int)catcher; 263 264 /* Remember that we're now on the signal stack. */ 265 if (onstack) 266 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 267 268 #ifdef DEBUG 269 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 270 printf("sendsig(%d): sig %d returns\n", 271 p->p_pid, sig); 272 #endif 273 } 274 275 int 276 sys___sigreturn14(struct lwp *l, void *v, register_t *retval) 277 { 278 struct sys___sigreturn14_args /* { 279 syscallarg(struct sigcontext *) sigcntxp; 280 } */ *uap = v; 281 struct proc *p = l->l_proc; 282 struct sigcontext *scp; 283 struct trapframe *tf; 284 struct sigcontext tsigc; 285 struct sigstate tstate; 286 int rf, flags; 287 288 /* 289 * The trampoline code hands us the context. 290 * It is unsafe to keep track of it ourselves, in the event that a 291 * program jumps out of a signal handler. 292 */ 293 scp = SCARG(uap, sigcntxp); 294 #ifdef DEBUG 295 if (sigdebug & SDB_FOLLOW) 296 printf("sigreturn: pid %d, scp %p\n", p->p_pid, scp); 297 #endif 298 if ((int)scp & 3) 299 return (EINVAL); 300 301 if (copyin(scp, &tsigc, sizeof(tsigc)) != 0) 302 return (EFAULT); 303 scp = &tsigc; 304 305 /* Make sure the user isn't pulling a fast one on us! */ 306 /* XXX fredette - until this is done, huge security hole here. */ 307 /* XXX fredette - requiring that PSL_R be zero will hurt debuggers. */ 308 #define PSW_MBS (PSW_C|PSW_Q|PSW_P|PSW_D|PSW_I) 309 #define PSW_MBZ (PSW_Y|PSW_Z|PSW_S|PSW_X|PSW_M|PSW_R) 310 if ((scp->sc_ps & (PSW_MBS|PSW_MBZ)) != PSW_MBS) 311 return (EINVAL); 312 313 /* Restore register context. */ 314 tf = (struct trapframe *)l->l_md.md_regs; 315 316 /* 317 * Grab pointer to hardware state information. 318 * If zero, the user is probably doing a longjmp. 319 */ 320 if ((rf = scp->sc_ap) == 0) 321 goto restore; 322 323 /* 324 * See if there is anything to do before we go to the 325 * expense of copying in the trapframe 326 */ 327 flags = fuword((caddr_t)rf); 328 #ifdef DEBUG 329 if (sigdebug & SDB_FOLLOW) 330 printf("sigreturn(%d): sc_ap %x flags %x\n", 331 p->p_pid, rf, flags); 332 #endif 333 /* fuword failed (bogus sc_ap value). */ 334 if (flags == -1) 335 return (EINVAL); 336 337 if (flags == 0 || copyin((caddr_t)rf, &tstate, sizeof(tstate)) != 0) 338 goto restore; 339 #ifdef DEBUG 340 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 341 printf("sigreturn(%d): ssp %p usp %x scp %p\n", 342 p->p_pid, &flags, scp->sc_sp, SCARG(uap, sigcntxp)); 343 #endif 344 345 /* 346 * Restore most of the users registers except for those 347 * in the sigcontext; they will be handled below. 348 */ 349 if (flags & SS_USERREGS) { 350 351 /* 352 * There are more registers that the user can tell 353 * us to bash than registers that, for security 354 * or other reasons, we must protect. So it's 355 * easier (but not faster), to copy these sensitive 356 * register values into the user-provided frame, 357 * then bulk-copy the user-provided frame into 358 * the process' frame. 359 */ 360 #define SIG_PROTECT(r) tstate.ss_frame.r = tf->r 361 /* SRs 5,6,7 must be protected. */ 362 SIG_PROTECT(tf_sr5); 363 SIG_PROTECT(tf_sr6); 364 SIG_PROTECT(tf_sr7); 365 366 /* all CRs except CR11 must be protected. */ 367 SIG_PROTECT(tf_rctr); /* CR0 */ 368 /* CRs 1-8 are reserved */ 369 SIG_PROTECT(tf_pidr1); /* CR8 */ 370 SIG_PROTECT(tf_pidr2); /* CR9 */ 371 SIG_PROTECT(tf_ccr); /* CR10 */ 372 SIG_PROTECT(tf_pidr3); /* CR12 */ 373 SIG_PROTECT(tf_pidr4); /* CR14 */ 374 SIG_PROTECT(tf_eiem); /* CR15 */ 375 /* CR17 is the IISQ head */ 376 /* CR18 is the IIOQ head */ 377 SIG_PROTECT(tf_iir); /* CR19 */ 378 SIG_PROTECT(tf_isr); /* CR20 */ 379 SIG_PROTECT(tf_ior); /* CR21 */ 380 /* CR22 is the IPSW */ 381 SIG_PROTECT(tf_eirr); /* CR23 */ 382 SIG_PROTECT(tf_hptm); /* CR24 */ 383 SIG_PROTECT(tf_vtop); /* CR25 */ 384 /* XXX where are CR26, CR27, CR29, CR31? */ 385 SIG_PROTECT(tf_cr28); /* CR28 */ 386 SIG_PROTECT(tf_cr30); /* CR30 */ 387 #undef SIG_PROTECT 388 389 /* The bulk copy. */ 390 *tf = tstate.ss_frame; 391 } 392 393 /* 394 * Restore the original FP context 395 */ 396 /* XXX fredette */ 397 398 restore: 399 /* 400 * Restore the user supplied information. 401 * This should be at the last so that the error (EINVAL) 402 * is reported to the sigreturn caller, not to the 403 * jump destination. 404 */ 405 406 tf->tf_sp = scp->sc_sp; 407 /* XXX should we be doing the space registers? */ 408 tf->tf_iisq_head = scp->sc_pcsqh; 409 tf->tf_iioq_head = scp->sc_pcoqh | HPPA_PC_PRIV_USER; 410 tf->tf_iisq_tail = scp->sc_pcsqt; 411 tf->tf_iioq_tail = scp->sc_pcoqt | HPPA_PC_PRIV_USER; 412 tf->tf_ipsw = scp->sc_ps; 413 414 /* Restore signal stack. */ 415 if (scp->sc_onstack & SS_ONSTACK) 416 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 417 else 418 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 419 420 /* Restore signal mask. */ 421 (void) sigprocmask1(p, SIG_SETMASK, &scp->sc_mask, 0); 422 423 #ifdef DEBUG 424 #if 0 /* XXX FP state */ 425 if ((sigdebug & SDB_FPSTATE) && *(char *)&tstate.ss_fpstate) 426 printf("sigreturn(%d): copied in FP state (%x) at %p\n", 427 p->p_pid, *(u_int *)&tstate.ss_fpstate, 428 &tstate.ss_fpstate); 429 #endif 430 if ((sigdebug & SDB_FOLLOW) || 431 ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)) 432 printf("sigreturn(%d): returns\n", p->p_pid); 433 #endif 434 return (EJUSTRETURN); 435 } 436 437
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