sig_machdep.c revision 1.4
1 /* $NetBSD: sig_machdep.c,v 1.4 2003/08/07 16:27:51 agc 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 1.4 2003/08/07 16:27:51 agc 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/syscallargs.h> 130 131 #include <machine/cpu.h> 132 #include <machine/reg.h> 133 134 #ifdef DEBUG 135 int sigdebug = 0xff; 136 int sigpid = 0; 137 #define SDB_FOLLOW 0x01 138 #define SDB_KSTACK 0x02 139 #define SDB_FPSTATE 0x04 140 #endif 141 142 /* 143 * Send an interrupt to process. 144 */ 145 void 146 sendsig(sig, mask, code) 147 int sig; 148 sigset_t *mask; 149 u_long code; 150 { 151 struct proc *p = curproc; 152 struct sigacts *ps = p->p_sigacts; 153 struct sigframe *fp, kf; 154 caddr_t sp; 155 struct trapframe *tf; 156 int onstack, fsize; 157 sig_t catcher = SIGACTION(p, sig).sa_handler; 158 159 tf = (struct trapframe *)p->p_md.md_regs; 160 161 /* Do we need to jump onto the signal stack? */ 162 onstack = 163 (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 164 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 165 166 /* 167 * Allocate space for the signal handler context. 168 * The PA-RISC calling convention mandates that 169 * the stack pointer must always be 64-byte aligned, 170 * and points to the first *unused* byte. 171 */ 172 fsize = sizeof(struct sigframe); 173 sp = (onstack ? 174 (caddr_t)p->p_sigctx.ps_sigstk.ss_sp : 175 (caddr_t)tf->tf_sp); 176 sp = (caddr_t)(((u_int)(sp + fsize + 63)) & ~63); 177 fp = (struct sigframe *) (sp - fsize); 178 179 #ifdef DEBUG 180 if ((sigdebug & SDB_FOLLOW) && (!sigpid || p->p_pid == sigpid)) 181 printf("sendsig: %s[%d] sig %d catcher %p\n", 182 p->p_comm, p->p_pid, sig, catcher); 183 #endif 184 185 /* 186 * Save necessary hardware state. Currently this includes: 187 * - original exception frame 188 * - FP coprocessor state 189 */ 190 kf.sf_state.ss_flags = SS_USERREGS; 191 memcpy(&kf.sf_state.ss_frame, tf, sizeof(*tf)); 192 /* XXX FP state */ 193 194 /* Build the signal context to be used by sigreturn. */ 195 kf.sf_sc.sc_sp = tf->tf_sp; 196 kf.sf_sc.sc_fp = tf->tf_sp; /* XXX fredette - is this right? */ 197 kf.sf_sc.sc_ap = (int)&fp->sf_state; 198 kf.sf_sc.sc_pcsqh = tf->tf_iisq_head; 199 kf.sf_sc.sc_pcoqh = tf->tf_iioq_head; 200 kf.sf_sc.sc_pcsqt = tf->tf_iisq_tail; 201 kf.sf_sc.sc_pcoqt = tf->tf_iioq_tail; 202 kf.sf_sc.sc_ps = tf->tf_ipsw; 203 204 /* Save signal stack. */ 205 kf.sf_sc.sc_onstack = p->p_sigctx.ps_sigstk.ss_flags & SS_ONSTACK; 206 207 /* Save signal mask. */ 208 kf.sf_sc.sc_mask = *mask; 209 210 /* Fill the calling convention part of the signal frame. */ 211 kf.sf_psp = 0; 212 kf.sf_clup = 0; /* XXX fredette - is this right? */ 213 kf.sf_sl = 0; /* XXX fredette - is this right? */ 214 kf.sf_edp = 0; /* XXX fredette - is this right? */ 215 216 /* Copy out the signal frame. */ 217 if (copyout(&kf, fp, fsize)) { 218 #ifdef DEBUG 219 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 220 printf("sendsig(%d): copyout failed on sig %d\n", 221 p->p_pid, sig); 222 #endif 223 /* 224 * Process has trashed its stack; give it an illegal 225 * instruction to halt it in its tracks. 226 */ 227 sigexit(p, SIGILL); 228 /* NOTREACHED */ 229 } 230 #ifdef DEBUG 231 if (sigdebug & SDB_FOLLOW) 232 printf("sendsig(%d): sig %d scp %p fp %p sc_sp %x sc_ap %x\n", 233 p->p_pid, sig, &fp->sf_sc, fp, 234 kf.sf_sc.sc_sp, kf.sf_sc.sc_ap); 235 #endif 236 237 /* Set up the registers to return to sigcode. */ 238 switch (ps->sa_sigdesc[sig].sd_vers) { 239 #if 1 /* COMPAT_16 */ 240 case 0: /* legacy on-stack sigtramp */ 241 tf->tf_iioq_head = 242 (int)p->p_sigctx.ps_sigcode | HPPA_PC_PRIV_USER; 243 tf->tf_iioq_tail = tf->tf_iioq_head + 4; 244 break; 245 #endif 246 247 case 1: 248 tf->tf_iioq_head = 249 (int)ps->sa_sigdesc[sig].sd_tramp | HPPA_PC_PRIV_USER; 250 tf->tf_iioq_tail = tf->tf_iioq_head + 4; 251 break; 252 253 default: 254 /* Don't know what trampoline version; kill it. */ 255 sigexit(p, SIGILL); 256 } 257 258 tf->tf_sp = (int)sp; 259 tf->tf_r3 = (int)&fp->sf_sc; 260 tf->tf_arg0 = sig; 261 tf->tf_arg1 = code; 262 tf->tf_arg2 = (int)&fp->sf_sc; 263 tf->tf_arg3 = (int)catcher; 264 265 /* Remember that we're now on the signal stack. */ 266 if (onstack) 267 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 268 269 #ifdef DEBUG 270 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 271 printf("sendsig(%d): sig %d returns\n", 272 p->p_pid, sig); 273 #endif 274 } 275 276 int 277 sys___sigreturn14(p, v, retval) 278 struct proc *p; 279 void *v; 280 register_t *retval; 281 { 282 struct sys___sigreturn14_args /* { 283 syscallarg(struct sigcontext *) sigcntxp; 284 } */ *uap = v; 285 struct sigcontext *scp; 286 struct trapframe *tf; 287 struct sigcontext tsigc; 288 struct sigstate tstate; 289 int rf, flags; 290 291 /* 292 * The trampoline code hands us the context. 293 * It is unsafe to keep track of it ourselves, in the event that a 294 * program jumps out of a signal handler. 295 */ 296 scp = SCARG(uap, sigcntxp); 297 #ifdef DEBUG 298 if (sigdebug & SDB_FOLLOW) 299 printf("sigreturn: pid %d, scp %p\n", p->p_pid, scp); 300 #endif 301 if ((int)scp & 3) 302 return (EINVAL); 303 304 if (copyin(scp, &tsigc, sizeof(tsigc)) != 0) 305 return (EFAULT); 306 scp = &tsigc; 307 308 /* Make sure the user isn't pulling a fast one on us! */ 309 /* XXX fredette - until this is done, huge security hole here. */ 310 /* XXX fredette - requiring that PSL_R be zero will hurt debuggers. */ 311 #define PSW_MBS (PSW_C|PSW_Q|PSW_P|PSW_D|PSW_I) 312 #define PSW_MBZ (PSW_Y|PSW_Z|PSW_S|PSW_X|PSW_M|PSW_R) 313 if ((scp->sc_ps & (PSW_MBS|PSW_MBZ)) != PSW_MBS) 314 return (EINVAL); 315 316 /* Restore register context. */ 317 tf = (struct trapframe *) p->p_md.md_regs; 318 319 /* 320 * Grab pointer to hardware state information. 321 * If zero, the user is probably doing a longjmp. 322 */ 323 if ((rf = scp->sc_ap) == 0) 324 goto restore; 325 326 /* 327 * See if there is anything to do before we go to the 328 * expense of copying in the trapframe 329 */ 330 flags = fuword((caddr_t)rf); 331 #ifdef DEBUG 332 if (sigdebug & SDB_FOLLOW) 333 printf("sigreturn(%d): sc_ap %x flags %x\n", 334 p->p_pid, rf, flags); 335 #endif 336 /* fuword failed (bogus sc_ap value). */ 337 if (flags == -1) 338 return (EINVAL); 339 340 if (flags == 0 || copyin((caddr_t)rf, &tstate, sizeof(tstate)) != 0) 341 goto restore; 342 #ifdef DEBUG 343 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 344 printf("sigreturn(%d): ssp %p usp %x scp %p\n", 345 p->p_pid, &flags, scp->sc_sp, SCARG(uap, sigcntxp)); 346 #endif 347 348 /* 349 * Restore most of the users registers except for those 350 * in the sigcontext; they will be handled below. 351 */ 352 if (flags & SS_USERREGS) { 353 354 /* 355 * There are more registers that the user can tell 356 * us to bash than registers that, for security 357 * or other reasons, we must protect. So it's 358 * easier (but not faster), to copy these sensitive 359 * register values into the user-provided frame, 360 * then bulk-copy the user-provided frame into 361 * the process' frame. 362 */ 363 #define SIG_PROTECT(r) tstate.ss_frame.r = tf->r 364 /* SRs 5,6,7 must be protected. */ 365 SIG_PROTECT(tf_sr5); 366 SIG_PROTECT(tf_sr6); 367 SIG_PROTECT(tf_sr7); 368 369 /* all CRs except CR11 must be protected. */ 370 SIG_PROTECT(tf_rctr); /* CR0 */ 371 /* CRs 1-8 are reserved */ 372 SIG_PROTECT(tf_pidr1); /* CR8 */ 373 SIG_PROTECT(tf_pidr2); /* CR9 */ 374 SIG_PROTECT(tf_ccr); /* CR10 */ 375 SIG_PROTECT(tf_pidr3); /* CR12 */ 376 SIG_PROTECT(tf_pidr4); /* CR14 */ 377 SIG_PROTECT(tf_eiem); /* CR15 */ 378 /* CR17 is the IISQ head */ 379 /* CR18 is the IIOQ head */ 380 SIG_PROTECT(tf_iir); /* CR19 */ 381 SIG_PROTECT(tf_isr); /* CR20 */ 382 SIG_PROTECT(tf_ior); /* CR21 */ 383 /* CR22 is the IPSW */ 384 SIG_PROTECT(tf_eirr); /* CR23 */ 385 SIG_PROTECT(tf_hptm); /* CR24 */ 386 SIG_PROTECT(tf_vtop); /* CR25 */ 387 /* XXX where are CR26, CR27, CR29, CR31? */ 388 SIG_PROTECT(tf_cr28); /* CR28 */ 389 SIG_PROTECT(tf_cr30); /* CR30 */ 390 #undef SIG_PROTECT 391 392 /* The bulk copy. */ 393 *tf = tstate.ss_frame; 394 } 395 396 /* 397 * Restore the original FP context 398 */ 399 /* XXX fredette */ 400 401 restore: 402 /* 403 * Restore the user supplied information. 404 * This should be at the last so that the error (EINVAL) 405 * is reported to the sigreturn caller, not to the 406 * jump destination. 407 */ 408 409 tf->tf_sp = scp->sc_sp; 410 /* XXX should we be doing the space registers? */ 411 tf->tf_iisq_head = scp->sc_pcsqh; 412 tf->tf_iioq_head = scp->sc_pcoqh | HPPA_PC_PRIV_USER; 413 tf->tf_iisq_tail = scp->sc_pcsqt; 414 tf->tf_iioq_tail = scp->sc_pcoqt | HPPA_PC_PRIV_USER; 415 tf->tf_ipsw = scp->sc_ps; 416 417 /* Restore signal stack. */ 418 if (scp->sc_onstack & SS_ONSTACK) 419 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 420 else 421 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 422 423 /* Restore signal mask. */ 424 (void) sigprocmask1(p, SIG_SETMASK, &scp->sc_mask, 0); 425 426 #ifdef DEBUG 427 #if 0 /* XXX FP state */ 428 if ((sigdebug & SDB_FPSTATE) && *(char *)&tstate.ss_fpstate) 429 printf("sigreturn(%d): copied in FP state (%x) at %p\n", 430 p->p_pid, *(u_int *)&tstate.ss_fpstate, 431 &tstate.ss_fpstate); 432 #endif 433 if ((sigdebug & SDB_FOLLOW) || 434 ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)) 435 printf("sigreturn(%d): returns\n", p->p_pid); 436 #endif 437 return (EJUSTRETURN); 438 } 439 440
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