1*04aa4da3Schs /* $NetBSD: trap.c,v 1.39 2010/03/20 23:31:29 chs Exp $ */ 2aad01611Sagc 3aad01611Sagc /* 4aad01611Sagc * Copyright (c) 1982, 1986, 1990, 1993 5aad01611Sagc * The Regents of the University of California. All rights reserved. 6aad01611Sagc * 7aad01611Sagc * This code is derived from software contributed to Berkeley by 8aad01611Sagc * the Systems Programming Group of the University of Utah Computer 9aad01611Sagc * Science Department. 10aad01611Sagc * 11aad01611Sagc * Redistribution and use in source and binary forms, with or without 12aad01611Sagc * modification, are permitted provided that the following conditions 13aad01611Sagc * are met: 14aad01611Sagc * 1. Redistributions of source code must retain the above copyright 15aad01611Sagc * notice, this list of conditions and the following disclaimer. 16aad01611Sagc * 2. Redistributions in binary form must reproduce the above copyright 17aad01611Sagc * notice, this list of conditions and the following disclaimer in the 18aad01611Sagc * documentation and/or other materials provided with the distribution. 19aad01611Sagc * 3. Neither the name of the University nor the names of its contributors 20aad01611Sagc * may be used to endorse or promote products derived from this software 21aad01611Sagc * without specific prior written permission. 22aad01611Sagc * 23aad01611Sagc * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24aad01611Sagc * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25aad01611Sagc * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26aad01611Sagc * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27aad01611Sagc * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28aad01611Sagc * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29aad01611Sagc * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30aad01611Sagc * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31aad01611Sagc * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32aad01611Sagc * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33aad01611Sagc * SUCH DAMAGE. 34aad01611Sagc * 35aad01611Sagc * from: Utah Hdr: trap.c 1.37 92/12/20 36aad01611Sagc * from: @(#)trap.c 8.5 (Berkeley) 1/4/94 37aad01611Sagc */ 38ec984a04Sfredette 39ec984a04Sfredette /* 40ec984a04Sfredette * Copyright (c) 1994 Gordon W. Ross 41ec984a04Sfredette * Copyright (c) 1993 Adam Glass 42ec984a04Sfredette * Copyright (c) 1988 University of Utah. 43ec984a04Sfredette * 44ec984a04Sfredette * This code is derived from software contributed to Berkeley by 45ec984a04Sfredette * the Systems Programming Group of the University of Utah Computer 46ec984a04Sfredette * Science Department. 47ec984a04Sfredette * 48ec984a04Sfredette * Redistribution and use in source and binary forms, with or without 49ec984a04Sfredette * modification, are permitted provided that the following conditions 50ec984a04Sfredette * are met: 51ec984a04Sfredette * 1. Redistributions of source code must retain the above copyright 52ec984a04Sfredette * notice, this list of conditions and the following disclaimer. 53ec984a04Sfredette * 2. Redistributions in binary form must reproduce the above copyright 54ec984a04Sfredette * notice, this list of conditions and the following disclaimer in the 55ec984a04Sfredette * documentation and/or other materials provided with the distribution. 56ec984a04Sfredette * 3. All advertising materials mentioning features or use of this software 57ec984a04Sfredette * must display the following acknowledgement: 58ec984a04Sfredette * This product includes software developed by the University of 59ec984a04Sfredette * California, Berkeley and its contributors. 60ec984a04Sfredette * 4. Neither the name of the University nor the names of its contributors 61ec984a04Sfredette * may be used to endorse or promote products derived from this software 62ec984a04Sfredette * without specific prior written permission. 63ec984a04Sfredette * 64ec984a04Sfredette * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 65ec984a04Sfredette * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 66ec984a04Sfredette * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 67ec984a04Sfredette * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 68ec984a04Sfredette * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 69ec984a04Sfredette * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 70ec984a04Sfredette * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 71ec984a04Sfredette * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 72ec984a04Sfredette * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 73ec984a04Sfredette * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 74ec984a04Sfredette * SUCH DAMAGE. 75ec984a04Sfredette * 76ec984a04Sfredette * from: Utah Hdr: trap.c 1.37 92/12/20 77ec984a04Sfredette * from: @(#)trap.c 8.5 (Berkeley) 1/4/94 78ec984a04Sfredette */ 79ec984a04Sfredette 80ed517291Slukem #include <sys/cdefs.h> 81*04aa4da3Schs __KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.39 2010/03/20 23:31:29 chs Exp $"); 82ed517291Slukem 83ec984a04Sfredette #include "opt_ddb.h" 84ec984a04Sfredette #include "opt_execfmt.h" 85d505b189Smartin #include "opt_fpu_emulate.h" 86d84d2c6cSlukem #include "opt_kgdb.h" 87ec984a04Sfredette #include "opt_compat_aout_m68k.h" 88ec984a04Sfredette #include "opt_compat_sunos.h" 89ec984a04Sfredette 90ec984a04Sfredette #include <sys/param.h> 91ec984a04Sfredette #include <sys/systm.h> 92ec984a04Sfredette #include <sys/proc.h> 93ec984a04Sfredette #include <sys/acct.h> 94ec984a04Sfredette #include <sys/kernel.h> 95ec984a04Sfredette #include <sys/signalvar.h> 96ec984a04Sfredette #include <sys/resourcevar.h> 97fc7511b0Swrstuden #include <sys/sa.h> 98fc7511b0Swrstuden #include <sys/savar.h> 99ec984a04Sfredette #include <sys/syscall.h> 100ec984a04Sfredette #include <sys/syslog.h> 101ef56cc40Scl #include <sys/userret.h> 10228e8a168Syamt #include <sys/kauth.h> 103ec984a04Sfredette #ifdef KGDB 104ec984a04Sfredette #include <sys/kgdb.h> 105ec984a04Sfredette #endif 106ec984a04Sfredette 107ec984a04Sfredette #include <uvm/uvm_extern.h> 108ec984a04Sfredette 109ec984a04Sfredette #include <machine/cpu.h> 110ec984a04Sfredette #include <machine/endian.h> 111ec984a04Sfredette #include <machine/psl.h> 112ec984a04Sfredette #include <machine/trap.h> 113ec984a04Sfredette #include <machine/reg.h> 114ec984a04Sfredette #include <machine/promlib.h> 115ec984a04Sfredette 116ec984a04Sfredette #include <sun2/sun2/fc.h> 117ec984a04Sfredette #include <sun2/sun2/machdep.h> 118ec984a04Sfredette 1190dc8ee94Smatt #ifdef DDB 1200dc8ee94Smatt #include <machine/db_machdep.h> 1210dc8ee94Smatt #include <ddb/db_extern.h> 1220dc8ee94Smatt #endif 1230dc8ee94Smatt 124ec984a04Sfredette #ifdef COMPAT_SUNOS 125ec984a04Sfredette #include <compat/sunos/sunos_syscall.h> 126ec984a04Sfredette extern struct emul emul_sunos; 127ec984a04Sfredette #endif 128ec984a04Sfredette 129ec984a04Sfredette #ifdef COMPAT_AOUT_M68K 130ec984a04Sfredette extern struct emul emul_netbsd_aoutm68k; 131ec984a04Sfredette #endif 132ec984a04Sfredette 133ec984a04Sfredette /* Special labels in m68k/copy.s */ 134ec984a04Sfredette extern char fubail[], subail[]; 135ec984a04Sfredette 136ec984a04Sfredette /* These are called from locore.s */ 137d2eac2f6Smhitch void trap(struct trapframe *, int type, u_int code, u_int v); 13810b1a7beSchs void trap_kdebug(int type, struct trapframe tf); 13910b1a7beSchs int _nodb_trap(int type, struct trapframe *); 14010b1a7beSchs void straytrap(struct trapframe); 141ec984a04Sfredette 14210b1a7beSchs static void userret(struct lwp *, struct trapframe *, u_quad_t); 143ec984a04Sfredette 144ec984a04Sfredette int astpending; 145ec984a04Sfredette int want_resched; 146ec984a04Sfredette 1476df30aa4Stsutsui const char *trap_type[] = { 148ec984a04Sfredette "Bus error", 149ec984a04Sfredette "Address error", 150ec984a04Sfredette "Illegal instruction", 151ec984a04Sfredette "Zero divide", 152ec984a04Sfredette "CHK instruction", 153ec984a04Sfredette "TRAPV instruction", 154ec984a04Sfredette "Privilege violation", 155ec984a04Sfredette "Trace trap", 156ec984a04Sfredette "MMU fault", 157ec984a04Sfredette "SSIR trap", 158ec984a04Sfredette "Format error", 159ec984a04Sfredette "68881 exception", 160ec984a04Sfredette "Coprocessor violation", 161ec984a04Sfredette "Async system trap", 162ec984a04Sfredette "Unused? (14)", 163ec984a04Sfredette "Breakpoint", 164ec984a04Sfredette "FPU instruction", 165ec984a04Sfredette "FPU data format", 166ec984a04Sfredette }; 167ec984a04Sfredette u_int trap_types = sizeof(trap_type) / sizeof(trap_type[0]); 168ec984a04Sfredette 169ec984a04Sfredette /* 170ec984a04Sfredette * Size of various exception stack frames (minus the standard 8 bytes) 171ec984a04Sfredette */ 172ec984a04Sfredette short exframesize[] = { 173ec984a04Sfredette FMT0SIZE, /* type 0 - normal (68020/030/040/060) */ 174ec984a04Sfredette FMT1SIZE, /* type 1 - throwaway (68020/030/040) */ 175ec984a04Sfredette FMT2SIZE, /* type 2 - normal 6-word (68020/030/040/060) */ 176ec984a04Sfredette FMT3SIZE, /* type 3 - FP post-instruction (68040/060) */ 177ec984a04Sfredette FMT4SIZE, /* type 4 - access error/fp disabled (68060) */ 178ec984a04Sfredette -1, -1, /* type 5-6 - undefined */ 179ec984a04Sfredette FMT7SIZE, /* type 7 - access error (68040) */ 180ec984a04Sfredette FMT8SIZE, /* type 8 - bus fault (68010) */ 181ec984a04Sfredette FMT9SIZE, /* type 9 - coprocessor mid-instruction (68020/030) */ 182ec984a04Sfredette FMTASIZE, /* type A - short bus fault (68020/030) */ 183ec984a04Sfredette FMTBSIZE, /* type B - long bus fault (68020/030) */ 184ec984a04Sfredette -1, -1, -1, -1 /* type C-F - undefined */ 185ec984a04Sfredette }; 186ec984a04Sfredette 187ec984a04Sfredette #define KDFAULT(c) (((c) & (SSW1_IF|SSW1_FCMASK)) == (FC_SUPERD)) 188ec984a04Sfredette #define WRFAULT(c) (((c) & (SSW1_IF|SSW1_DF|SSW1_RW)) == (0)) 189ec984a04Sfredette 190ec984a04Sfredette /* #define DEBUG XXX */ 191ec984a04Sfredette 192ec984a04Sfredette #ifdef DEBUG 1938b21bb00Sfredette unsigned short buserr_reg; 194ec984a04Sfredette int mmudebug = 0; 195ec984a04Sfredette int mmupid = -1; 196ec984a04Sfredette #define MDB_ISPID(p) ((p) == mmupid) 197ec984a04Sfredette #define MDB_FOLLOW 1 198ec984a04Sfredette #define MDB_WBFOLLOW 2 199ec984a04Sfredette #define MDB_WBFAILED 4 200ec984a04Sfredette #define MDB_CPFAULT 8 201ec984a04Sfredette #endif 202ec984a04Sfredette 203ec984a04Sfredette /* 204ec984a04Sfredette * trap and syscall both need the following work done before 205ec984a04Sfredette * returning to user mode. 206ec984a04Sfredette */ 207ec984a04Sfredette static void 20810b1a7beSchs userret(struct lwp *l, struct trapframe *tf, u_quad_t oticks) 209ec984a04Sfredette { 210d2275d51Sthorpej struct proc *p = l->l_proc; 211ec984a04Sfredette 212ef56cc40Scl /* Invoke MI userret code */ 213ef56cc40Scl mi_userret(l); 214ec984a04Sfredette 215ec984a04Sfredette /* 216ec984a04Sfredette * If profiling, charge system time to the trapped pc. 217ec984a04Sfredette */ 218b07ec3fcSad if (p->p_stflag & PST_PROFIL) { 219ec984a04Sfredette extern int psratio; 220b07ec3fcSad addupc_task(l, tf->tf_pc, 221ec984a04Sfredette (int)(p->p_sticks - oticks) * psratio); 222ec984a04Sfredette } 223ec984a04Sfredette } 224ec984a04Sfredette 225ec984a04Sfredette /* 226ec984a04Sfredette * Used by the common m68k syscall() and child_return() functions. 227ec984a04Sfredette * XXX: Temporary until all m68k ports share common trap()/userret() code. 228ec984a04Sfredette */ 229d2275d51Sthorpej void machine_userret(struct lwp *, struct frame *, u_quad_t); 230ec984a04Sfredette 231ec984a04Sfredette void 23210b1a7beSchs machine_userret(struct lwp *l, struct frame *f, u_quad_t t) 233ec984a04Sfredette { 234ec984a04Sfredette 235d2275d51Sthorpej userret(l, &f->F_t, t); 236ec984a04Sfredette } 237ec984a04Sfredette 238ec984a04Sfredette /* 239ec984a04Sfredette * Trap is called from locore to handle most types of processor traps, 240ec984a04Sfredette * including events such as simulated software interrupts/AST's. 241ec984a04Sfredette * System calls are broken out for efficiency. 242ec984a04Sfredette */ 243ec984a04Sfredette /*ARGSUSED*/ 244ec984a04Sfredette void 245d2eac2f6Smhitch trap(struct trapframe *tf, int type, u_int code, u_int v) 246ec984a04Sfredette { 247d2275d51Sthorpej struct lwp *l; 248bbb634caSfredette struct proc *p; 249a626cff9Srmind struct pcb *pcb; 25041692372Scl ksiginfo_t ksi; 25141692372Scl int tmp; 252*04aa4da3Schs int rv; 253ec984a04Sfredette u_quad_t sticks; 254*04aa4da3Schs void *onfault; 255ec984a04Sfredette 256ec984a04Sfredette uvmexp.traps++; 257d2275d51Sthorpej l = curlwp; 258*04aa4da3Schs p = l->l_proc; 259*04aa4da3Schs pcb = lwp_getpcb(l); 260*04aa4da3Schs onfault = pcb->pcb_onfault; 26141692372Scl 26268723a99Sthorpej KSI_INIT_TRAP(&ksi); 26341692372Scl ksi.ksi_trap = type & ~T_USER; 264ec984a04Sfredette 265a626cff9Srmind KASSERT(pcb != NULL); 266ec984a04Sfredette 267d2eac2f6Smhitch if (USERMODE(tf->tf_sr)) { 268ec984a04Sfredette type |= T_USER; 269ec984a04Sfredette sticks = p->p_sticks; 270d2eac2f6Smhitch l->l_md.md_regs = tf->tf_regs; 2712b79369cSad LWP_CACHE_CREDS(l, p); 272ec984a04Sfredette } else { 273ec984a04Sfredette sticks = 0; 274ec984a04Sfredette /* XXX: Detect trap recursion? */ 275ec984a04Sfredette } 276ec984a04Sfredette 277ec984a04Sfredette switch (type) { 278ec984a04Sfredette default: 279ec984a04Sfredette dopanic: 280ec984a04Sfredette printf("trap type=0x%x, code=0x%x, v=0x%x\n", type, code, v); 281ec984a04Sfredette /* 282ec984a04Sfredette * Let the kernel debugger see the trap frame that 283ec984a04Sfredette * caused us to panic. This is a convenience so 284ec984a04Sfredette * one can see registers at the point of failure. 285ec984a04Sfredette */ 286ec984a04Sfredette tmp = splhigh(); 287ec984a04Sfredette #ifdef KGDB 288ec984a04Sfredette /* If connected, step or cont returns 1 */ 289d2eac2f6Smhitch if (kgdb_trap(type, tf)) 290ec984a04Sfredette goto kgdb_cont; 291ec984a04Sfredette #endif 292ec984a04Sfredette #ifdef DDB 293d2eac2f6Smhitch (void) kdb_trap(type, (db_regs_t *) tf); 294ec984a04Sfredette #endif 295ec984a04Sfredette #ifdef KGDB 296ec984a04Sfredette kgdb_cont: 297ec984a04Sfredette #endif 298ec984a04Sfredette splx(tmp); 299ec984a04Sfredette if (panicstr) { 300ec984a04Sfredette /* 301ec984a04Sfredette * Note: panic is smart enough to do: 302ec984a04Sfredette * boot(RB_AUTOBOOT | RB_NOSYNC, NULL) 303ec984a04Sfredette * if we call it again. 304ec984a04Sfredette */ 305ec984a04Sfredette panic("trap during panic!"); 306ec984a04Sfredette } 307d2eac2f6Smhitch regdump(tf, 128); 308ec984a04Sfredette type &= ~T_USER; 309ec984a04Sfredette if ((u_int)type < trap_types) 310ec984a04Sfredette panic(trap_type[type]); 311ec984a04Sfredette panic("trap type 0x%x", type); 312ec984a04Sfredette 313ec984a04Sfredette case T_BUSERR: /* kernel bus error */ 314*04aa4da3Schs if (onfault == NULL) 315ec984a04Sfredette goto dopanic; 316*04aa4da3Schs rv = EFAULT; 317ec984a04Sfredette /*FALLTHROUGH*/ 318ec984a04Sfredette 319ec984a04Sfredette copyfault: 320ec984a04Sfredette /* 321ec984a04Sfredette * If we have arranged to catch this fault in any of the 322ec984a04Sfredette * copy to/from user space routines, set PC to return to 323ec984a04Sfredette * indicated location and set flag informing buserror code 324ec984a04Sfredette * that it may need to clean up stack frame. 325ec984a04Sfredette */ 326d2eac2f6Smhitch tf->tf_stackadj = exframesize[tf->tf_format]; 327d2eac2f6Smhitch tf->tf_format = tf->tf_vector = 0; 328*04aa4da3Schs tf->tf_pc = (int)onfault; 329*04aa4da3Schs tf->tf_regs[D0] = rv; 330ec984a04Sfredette goto done; 331ec984a04Sfredette 332ec984a04Sfredette case T_BUSERR|T_USER: /* bus error */ 333ec984a04Sfredette case T_ADDRERR|T_USER: /* address error */ 33441692372Scl ksi.ksi_addr = (void *)v; 33541692372Scl ksi.ksi_signo = SIGBUS; 33641692372Scl ksi.ksi_code = (type == (T_BUSERR|T_USER)) ? 33741692372Scl BUS_OBJERR : BUS_ADRERR; 338ec984a04Sfredette break; 339ec984a04Sfredette 340ec984a04Sfredette case T_COPERR: /* kernel coprocessor violation */ 341ec984a04Sfredette case T_FMTERR|T_USER: /* do all RTE errors come in as T_USER? */ 342ec984a04Sfredette case T_FMTERR: /* ...just in case... */ 343ec984a04Sfredette /* 344ec984a04Sfredette * The user has most likely trashed the RTE or FP state info 345ec984a04Sfredette * in the stack frame of a signal handler. 346ec984a04Sfredette */ 347ec984a04Sfredette printf("pid %d: kernel %s exception\n", p->p_pid, 348ec984a04Sfredette type==T_COPERR ? "coprocessor" : "format"); 349ec984a04Sfredette type |= T_USER; 350b07ec3fcSad 351284c2b9aSad mutex_enter(p->p_lock); 352ec984a04Sfredette SIGACTION(p, SIGILL).sa_handler = SIG_DFL; 353ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigignore, SIGILL); 354ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigcatch, SIGILL); 355b07ec3fcSad sigdelset(&l->l_sigmask, SIGILL); 356284c2b9aSad mutex_exit(p->p_lock); 357b07ec3fcSad 35841692372Scl ksi.ksi_signo = SIGILL; 359d2eac2f6Smhitch ksi.ksi_addr = (void *)(int)tf->tf_format; 36041692372Scl ksi.ksi_code = (type == T_COPERR) ? 36141692372Scl ILL_COPROC : ILL_ILLOPC; 362ec984a04Sfredette break; 363ec984a04Sfredette 364ec984a04Sfredette case T_COPERR|T_USER: /* user coprocessor violation */ 365ec984a04Sfredette /* What is a proper response here? */ 36641692372Scl ksi.ksi_signo = SIGFPE; 36741692372Scl ksi.ksi_code = FPE_FLTINV; 368ec984a04Sfredette break; 369ec984a04Sfredette 370ec984a04Sfredette case T_FPERR|T_USER: /* 68881 exceptions */ 371ec984a04Sfredette /* 372ec984a04Sfredette * We pass along the 68881 status register which locore stashed 373f055e182Smartin * in code for us. 374ec984a04Sfredette */ 37541692372Scl ksi.ksi_signo = SIGFPE; 376f055e182Smartin ksi.ksi_code = fpsr2siginfocode(code); 377ec984a04Sfredette break; 378ec984a04Sfredette 379ec984a04Sfredette case T_FPEMULI: /* FPU faults in supervisor mode */ 380ec984a04Sfredette case T_FPEMULD: 381ec984a04Sfredette if (nofault) /* Doing FPU probe? */ 382ec984a04Sfredette longjmp(nofault); 383ec984a04Sfredette goto dopanic; 384ec984a04Sfredette 3855d1e8b27Swiz case T_FPEMULI|T_USER: /* unimplemented FP instruction */ 386ec984a04Sfredette case T_FPEMULD|T_USER: /* unimplemented FP data type */ 387ec984a04Sfredette #ifdef FPU_EMULATE 388a626cff9Srmind if (fpu_emulate(tf, &pcb->pcb_fpregs, &ksi) == 0) 389d2eac2f6Smhitch ; /* XXX - Deal with tracing? (tf->tf_sr & PSL_T) */ 390ec984a04Sfredette #else 391ec984a04Sfredette uprintf("pid %d killed: no floating point support\n", p->p_pid); 39241692372Scl ksi.ksi_signo = SIGILL; 39341692372Scl ksi.ksi_code = ILL_ILLOPC; 394ec984a04Sfredette #endif 395ec984a04Sfredette break; 396ec984a04Sfredette 397ec984a04Sfredette case T_ILLINST|T_USER: /* illegal instruction fault */ 398ec984a04Sfredette case T_PRIVINST|T_USER: /* privileged instruction fault */ 399d2eac2f6Smhitch ksi.ksi_addr = (void *)(int)tf->tf_format; 40041692372Scl ksi.ksi_signo = SIGILL; 40141692372Scl ksi.ksi_code = (type == (T_PRIVINST|T_USER)) ? 40241692372Scl ILL_PRVOPC : ILL_ILLOPC; 403ec984a04Sfredette break; 404ec984a04Sfredette 405ec984a04Sfredette case T_ZERODIV|T_USER: /* Divide by zero */ 40641692372Scl ksi.ksi_code = FPE_FLTDIV; 407ec984a04Sfredette case T_CHKINST|T_USER: /* CHK instruction trap */ 408ec984a04Sfredette case T_TRAPVINST|T_USER: /* TRAPV instruction trap */ 409d2eac2f6Smhitch ksi.ksi_addr = (void *)(int)tf->tf_format; 41041692372Scl ksi.ksi_signo = SIGFPE; 411ec984a04Sfredette break; 412ec984a04Sfredette 413ec984a04Sfredette /* 414ec984a04Sfredette * XXX: Trace traps are a nightmare. 415ec984a04Sfredette * 416ec984a04Sfredette * HP-UX uses trap #1 for breakpoints, 417ec984a04Sfredette * NetBSD/m68k uses trap #2, 418ec984a04Sfredette * SUN 3.x uses trap #15, 419ec984a04Sfredette * DDB and KGDB uses trap #15 (for kernel breakpoints; 420ec984a04Sfredette * handled elsewhere). 421ec984a04Sfredette * 422ec984a04Sfredette * NetBSD and HP-UX traps both get mapped by locore.s into T_TRACE. 423ec984a04Sfredette * SUN 3.x traps get passed through as T_TRAP15 and are not really 424ec984a04Sfredette * supported yet. 425ec984a04Sfredette * 426ec984a04Sfredette * XXX: We should never get kernel-mode T_TRAP15 427ec984a04Sfredette * XXX: because locore.s now gives them special treatment. 428ec984a04Sfredette */ 429ec984a04Sfredette case T_TRAP15: /* kernel breakpoint */ 430d2eac2f6Smhitch tf->tf_sr &= ~PSL_T; 431ec984a04Sfredette goto done; 432ec984a04Sfredette 433ec984a04Sfredette case T_TRACE|T_USER: /* user trace trap */ 434ec984a04Sfredette #ifdef COMPAT_SUNOS 435ec984a04Sfredette /* 436ec984a04Sfredette * SunOS uses Trap #2 for a "CPU cache flush" 437ec984a04Sfredette * Just flush the on-chip caches and return. 438ec984a04Sfredette * XXX - Too bad NetBSD uses trap 2... 439ec984a04Sfredette */ 440ec984a04Sfredette if (p->p_emul == &emul_sunos) { 441ec984a04Sfredette /* get out fast */ 442ec984a04Sfredette goto done; 443ec984a04Sfredette } 444ec984a04Sfredette #endif 445ec984a04Sfredette /* FALLTHROUGH */ 446ec984a04Sfredette case T_TRACE: /* tracing a trap instruction */ 447ec984a04Sfredette case T_TRAP15|T_USER: /* SUN user trace trap */ 448d2eac2f6Smhitch tf->tf_sr &= ~PSL_T; 44941692372Scl ksi.ksi_signo = SIGTRAP; 450ec984a04Sfredette break; 451ec984a04Sfredette 452ec984a04Sfredette case T_ASTFLT: /* system async trap, cannot happen */ 453ec984a04Sfredette goto dopanic; 454ec984a04Sfredette 455ec984a04Sfredette case T_ASTFLT|T_USER: /* user async trap */ 456ec984a04Sfredette astpending = 0; 457ec984a04Sfredette /* T_SSIR is not used on a Sun2. */ 458b07ec3fcSad if (l->l_pflag & LP_OWEUPC) { 459b07ec3fcSad l->l_pflag &= ~LP_OWEUPC; 460b07ec3fcSad ADDUPROF(l); 461ec984a04Sfredette } 462bd291124Stsutsui if (curcpu()->ci_want_resched) 463b07ec3fcSad preempt(); 464ec984a04Sfredette goto douret; 465ec984a04Sfredette 466ec984a04Sfredette case T_MMUFLT: /* kernel mode page fault */ 467ec984a04Sfredette /* Hacks to avoid calling VM code from debugger. */ 468ec984a04Sfredette #ifdef DDB 469ec984a04Sfredette if (db_recover != 0) 470ec984a04Sfredette goto dopanic; 471ec984a04Sfredette #endif 472ec984a04Sfredette #ifdef KGDB 473ec984a04Sfredette if (kgdb_recover != 0) 474ec984a04Sfredette goto dopanic; 475ec984a04Sfredette #endif 476ec984a04Sfredette /* 477ec984a04Sfredette * If we were doing profiling ticks or other user mode 478ec984a04Sfredette * stuff from interrupt code, Just Say No. 479ec984a04Sfredette */ 480*04aa4da3Schs if (onfault == (void *)fubail || onfault == (void *)subail) { 481ec984a04Sfredette #ifdef DEBUG 482ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 483ec984a04Sfredette printf("trap: copyfault fu/su bail\n"); 484ec984a04Sfredette Debugger(); 485ec984a04Sfredette } 486ec984a04Sfredette #endif 487*04aa4da3Schs rv = EFAULT; 488ec984a04Sfredette goto copyfault; 489ec984a04Sfredette } 490ec984a04Sfredette /*FALLTHROUGH*/ 491ec984a04Sfredette 492ec984a04Sfredette case T_MMUFLT|T_USER: { /* page fault */ 493bbb634caSfredette vaddr_t va; 494bbb634caSfredette struct vmspace *vm = p->p_vmspace; 495bbb634caSfredette struct vm_map *map; 496ec984a04Sfredette vm_prot_t ftype; 497821ec03eSchs extern struct vm_map *kernel_map; 498ec984a04Sfredette 499ec984a04Sfredette #ifdef DEBUG 500ec984a04Sfredette if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 501ec984a04Sfredette printf("trap: T_MMUFLT pid=%d, code=0x%x, v=0x%x, pc=0x%x, sr=0x%x\n", 502d2eac2f6Smhitch p->p_pid, code, v, tf->tf_pc, tf->tf_sr); 503ec984a04Sfredette #endif 504ec984a04Sfredette 505ec984a04Sfredette /* 506ec984a04Sfredette * It is only a kernel address space fault iff: 507ec984a04Sfredette * 1. (type & T_USER) == 0 and: (2 or 3) 508ec984a04Sfredette * 2. pcb_onfault not set or 509ec984a04Sfredette * 3. pcb_onfault set but supervisor space data fault 510ec984a04Sfredette * The last can occur during an exec() copyin where the 511ec984a04Sfredette * argument space is lazy-allocated. 512ec984a04Sfredette */ 513ec984a04Sfredette map = &vm->vm_map; 514ec984a04Sfredette if ((type & T_USER) == 0) { 515ec984a04Sfredette /* supervisor mode fault */ 516*04aa4da3Schs if (onfault == NULL || KDFAULT(code)) 517ec984a04Sfredette map = kernel_map; 518fc7511b0Swrstuden } else if (l->l_flag & LW_SA) { 519fc7511b0Swrstuden l->l_savp->savp_faultaddr = (vaddr_t)v; 520fc7511b0Swrstuden l->l_pflag |= LP_SA_PAGEFAULT; 521ec984a04Sfredette } 522ec984a04Sfredette 523ec984a04Sfredette if (WRFAULT(code)) 524b744097aSchs ftype = VM_PROT_WRITE; 525ec984a04Sfredette else 526ec984a04Sfredette ftype = VM_PROT_READ; 527bbb634caSfredette va = m68k_trunc_page((vaddr_t)v); 528ec984a04Sfredette 529ec984a04Sfredette /* 530ec984a04Sfredette * Need to resolve the fault. 531ec984a04Sfredette * 532ec984a04Sfredette * We give the pmap code a chance to resolve faults by 533ec984a04Sfredette * reloading translations that it was forced to unload. 534ec984a04Sfredette * This function does that, and calls vm_fault if it 535ec984a04Sfredette * could not resolve the fault by reloading the MMU. 536ec984a04Sfredette * This function may also, for example, disallow any 537ec984a04Sfredette * faults in the kernel text segment, etc. 538ec984a04Sfredette */ 539*04aa4da3Schs pcb->pcb_onfault = NULL; 540ec984a04Sfredette rv = _pmap_fault(map, va, ftype); 541*04aa4da3Schs pcb->pcb_onfault = onfault; 542ec984a04Sfredette 543ec984a04Sfredette #ifdef DEBUG 544ec984a04Sfredette if (rv && MDB_ISPID(p->p_pid)) { 54547fbb9d8Sdrochner printf("vm_fault(%p, 0x%lx, 0x%x) -> 0x%x\n", 546ec984a04Sfredette map, va, ftype, rv); 547ec984a04Sfredette if (mmudebug & MDB_WBFAILED) 548ec984a04Sfredette Debugger(); 549ec984a04Sfredette } 550ec984a04Sfredette #endif /* DEBUG */ 551ec984a04Sfredette 552ec984a04Sfredette /* 553ec984a04Sfredette * If this was a stack access we keep track of the maximum 554ec984a04Sfredette * accessed stack size. Also, if vm_fault gets a protection 555ec984a04Sfredette * failure it is due to accessing the stack region outside 556ec984a04Sfredette * the current limit and we need to reflect that as an access 557ec984a04Sfredette * error. 558ec984a04Sfredette */ 559ec984a04Sfredette if (rv == 0) { 56053524e44Schristos if (map != kernel_map && (void *)va >= vm->vm_maxsaddr) 56164969161Sjdolecek uvm_grow(p, va); 562fc7511b0Swrstuden 563fc7511b0Swrstuden if ((type & T_USER) != 0) 564fc7511b0Swrstuden l->l_pflag &= ~LP_SA_PAGEFAULT; 565ec984a04Sfredette goto finish; 5663c10927eScl } 56741692372Scl if (rv == EACCES) { 56841692372Scl ksi.ksi_code = SEGV_ACCERR; 56941692372Scl rv = EFAULT; 57041692372Scl } else 57141692372Scl ksi.ksi_code = SEGV_MAPERR; 572ec984a04Sfredette if ((type & T_USER) == 0) { 573ec984a04Sfredette /* supervisor mode fault */ 574*04aa4da3Schs if (onfault) { 575ec984a04Sfredette #ifdef DEBUG 576ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 577ec984a04Sfredette printf("trap: copyfault pcb_onfault\n"); 578ec984a04Sfredette Debugger(); 579ec984a04Sfredette } 580ec984a04Sfredette #endif 581ec984a04Sfredette goto copyfault; 582ec984a04Sfredette } 58347fbb9d8Sdrochner printf("vm_fault(%p, 0x%lx, 0x%x) -> 0x%x\n", 584ec984a04Sfredette map, va, ftype, rv); 585ec984a04Sfredette goto dopanic; 586ec984a04Sfredette } 587fc7511b0Swrstuden l->l_pflag &= ~LP_SA_PAGEFAULT; 58841692372Scl ksi.ksi_addr = (void *)v; 589ec984a04Sfredette if (rv == ENOMEM) { 590ec984a04Sfredette printf("UVM: pid %d (%s), uid %d killed: out of swap\n", 591ec984a04Sfredette p->p_pid, p->p_comm, 592f474dcebSad l->l_cred ? 593f474dcebSad kauth_cred_geteuid(l->l_cred) : -1); 59441692372Scl ksi.ksi_signo = SIGKILL; 595ec984a04Sfredette } else { 59641692372Scl ksi.ksi_signo = SIGSEGV; 597ec984a04Sfredette } 598ec984a04Sfredette break; 599ec984a04Sfredette } /* T_MMUFLT */ 600ec984a04Sfredette } /* switch */ 601ec984a04Sfredette 602ec984a04Sfredette finish: 603ec984a04Sfredette /* If trap was from supervisor mode, just return. */ 604ec984a04Sfredette if ((type & T_USER) == 0) 605ec984a04Sfredette goto done; 606ec984a04Sfredette /* Post a signal if necessary. */ 60741692372Scl if (ksi.ksi_signo) 60841692372Scl trapsignal(l, &ksi); 609ec984a04Sfredette douret: 610d2eac2f6Smhitch userret(l, tf, sticks); 611ec984a04Sfredette 612ec984a04Sfredette done:; 613ec984a04Sfredette /* XXX: Detect trap recursion? */ 614ec984a04Sfredette } 615ec984a04Sfredette 616ec984a04Sfredette /* 617ec984a04Sfredette * This is used if we hit a kernel breakpoint or trace trap 618ec984a04Sfredette * when there is no debugger installed (or not attached). 619ec984a04Sfredette * Drop into the PROM temporarily... 620ec984a04Sfredette */ 621ec984a04Sfredette int 62210b1a7beSchs _nodb_trap(int type, struct trapframe *tf) 623ec984a04Sfredette { 624ec984a04Sfredette 625ec984a04Sfredette printf("\r\nKernel "); 626ec984a04Sfredette if ((0 <= type) && (type < trap_types)) 627ec984a04Sfredette printf("%s", trap_type[type]); 628ec984a04Sfredette else 629ec984a04Sfredette printf("trap 0x%x", type); 630ec984a04Sfredette printf(", frame=%p\r\n", tf); 631ec984a04Sfredette printf("No debugger; doing PROM abort.\r\n"); 632ec984a04Sfredette printf("To continue, type: c <RETURN>\r\n"); 633ec984a04Sfredette prom_abort(); 634ec984a04Sfredette /* OK then, just resume... */ 635ec984a04Sfredette tf->tf_sr &= ~PSL_T; 636ec984a04Sfredette return(1); 637ec984a04Sfredette } 638ec984a04Sfredette 639ec984a04Sfredette /* 640ec984a04Sfredette * This is called by locore for supervisor-mode trace and 641ec984a04Sfredette * breakpoint traps. This is separate from trap() above 642ec984a04Sfredette * so that breakpoints in trap() will work. 643ec984a04Sfredette * 644ec984a04Sfredette * If we have both DDB and KGDB, let KGDB see it first, 645ec984a04Sfredette * because KGDB will just return 0 if not connected. 646ec984a04Sfredette */ 647ec984a04Sfredette void 64810b1a7beSchs trap_kdebug(int type, struct trapframe tf) 649ec984a04Sfredette { 650ec984a04Sfredette 651ec984a04Sfredette #ifdef KGDB 652ec984a04Sfredette /* Let KGDB handle it (if connected) */ 653ec984a04Sfredette if (kgdb_trap(type, &tf)) 654ec984a04Sfredette return; 655ec984a04Sfredette #endif 656ec984a04Sfredette #ifdef DDB 657ec984a04Sfredette /* Let DDB handle it. */ 658ec984a04Sfredette if (kdb_trap(type, &tf)) 659ec984a04Sfredette return; 660ec984a04Sfredette #endif 661ec984a04Sfredette 662ec984a04Sfredette /* Drop into the PROM temporarily... */ 663ec984a04Sfredette (void)_nodb_trap(type, &tf); 664ec984a04Sfredette } 665ec984a04Sfredette 666ec984a04Sfredette /* 667ec984a04Sfredette * Called by locore.s for an unexpected interrupt. 668ec984a04Sfredette * XXX - Almost identical to trap_kdebug... 669ec984a04Sfredette */ 670ec984a04Sfredette void 67110b1a7beSchs straytrap(struct trapframe tf) 672ec984a04Sfredette { 673ec984a04Sfredette int type = -1; 674ec984a04Sfredette 675ec984a04Sfredette printf("unexpected trap; vector=0x%x at pc=0x%x\n", 676ec984a04Sfredette tf.tf_vector, tf.tf_pc); 677ec984a04Sfredette 678ec984a04Sfredette #ifdef KGDB 679ec984a04Sfredette /* Let KGDB handle it (if connected) */ 680ec984a04Sfredette if (kgdb_trap(type, &tf)) 681ec984a04Sfredette return; 682ec984a04Sfredette #endif 683ec984a04Sfredette #ifdef DDB 684ec984a04Sfredette /* Let DDB handle it. */ 685ec984a04Sfredette if (kdb_trap(type, &tf)) 686ec984a04Sfredette return; 687ec984a04Sfredette #endif 688ec984a04Sfredette 689ec984a04Sfredette /* Drop into the PROM temporarily... */ 690ec984a04Sfredette (void)_nodb_trap(type, &tf); 691ec984a04Sfredette } 692