1*28e8a168Syamt /* $NetBSD: trap.c,v 1.25 2006/05/15 12:36:39 yamt 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*28e8a168Syamt __KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.25 2006/05/15 12:36:39 yamt 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> 97d2275d51Sthorpej #include <sys/sa.h> 98d2275d51Sthorpej #include <sys/savar.h> 99ec984a04Sfredette #include <sys/syscall.h> 100ec984a04Sfredette #include <sys/syslog.h> 101ec984a04Sfredette #include <sys/user.h> 102ef56cc40Scl #include <sys/userret.h> 103*28e8a168Syamt #include <sys/kauth.h> 104ec984a04Sfredette #ifdef KGDB 105ec984a04Sfredette #include <sys/kgdb.h> 106ec984a04Sfredette #endif 107ec984a04Sfredette 108ec984a04Sfredette #include <uvm/uvm_extern.h> 109ec984a04Sfredette 110ec984a04Sfredette #include <machine/cpu.h> 111ec984a04Sfredette #include <machine/endian.h> 112ec984a04Sfredette #include <machine/psl.h> 113ec984a04Sfredette #include <machine/trap.h> 114ec984a04Sfredette #include <machine/reg.h> 115ec984a04Sfredette #include <machine/promlib.h> 116ec984a04Sfredette 117ec984a04Sfredette #include <sun2/sun2/fc.h> 118ec984a04Sfredette #include <sun2/sun2/machdep.h> 119ec984a04Sfredette 1200dc8ee94Smatt #ifdef DDB 1210dc8ee94Smatt #include <machine/db_machdep.h> 1220dc8ee94Smatt #include <ddb/db_extern.h> 1230dc8ee94Smatt #endif 1240dc8ee94Smatt 125ec984a04Sfredette #ifdef COMPAT_SUNOS 126ec984a04Sfredette #include <compat/sunos/sunos_syscall.h> 127ec984a04Sfredette extern struct emul emul_sunos; 128ec984a04Sfredette #endif 129ec984a04Sfredette 130ec984a04Sfredette #ifdef COMPAT_AOUT_M68K 131ec984a04Sfredette extern struct emul emul_netbsd_aoutm68k; 132ec984a04Sfredette #endif 133ec984a04Sfredette 134ec984a04Sfredette /* Special labels in m68k/copy.s */ 135ec984a04Sfredette extern char fubail[], subail[]; 136ec984a04Sfredette 137ec984a04Sfredette /* These are called from locore.s */ 13810b1a7beSchs void trap(int type, u_int code, u_int v, struct trapframe); 13910b1a7beSchs void trap_kdebug(int type, struct trapframe tf); 14010b1a7beSchs int _nodb_trap(int type, struct trapframe *); 14110b1a7beSchs void straytrap(struct trapframe); 142ec984a04Sfredette 14310b1a7beSchs static void userret(struct lwp *, struct trapframe *, u_quad_t); 144ec984a04Sfredette 145ec984a04Sfredette int astpending; 146ec984a04Sfredette int want_resched; 147ec984a04Sfredette 1486df30aa4Stsutsui const char *trap_type[] = { 149ec984a04Sfredette "Bus error", 150ec984a04Sfredette "Address error", 151ec984a04Sfredette "Illegal instruction", 152ec984a04Sfredette "Zero divide", 153ec984a04Sfredette "CHK instruction", 154ec984a04Sfredette "TRAPV instruction", 155ec984a04Sfredette "Privilege violation", 156ec984a04Sfredette "Trace trap", 157ec984a04Sfredette "MMU fault", 158ec984a04Sfredette "SSIR trap", 159ec984a04Sfredette "Format error", 160ec984a04Sfredette "68881 exception", 161ec984a04Sfredette "Coprocessor violation", 162ec984a04Sfredette "Async system trap", 163ec984a04Sfredette "Unused? (14)", 164ec984a04Sfredette "Breakpoint", 165ec984a04Sfredette "FPU instruction", 166ec984a04Sfredette "FPU data format", 167ec984a04Sfredette }; 168ec984a04Sfredette u_int trap_types = sizeof(trap_type) / sizeof(trap_type[0]); 169ec984a04Sfredette 170ec984a04Sfredette /* 171ec984a04Sfredette * Size of various exception stack frames (minus the standard 8 bytes) 172ec984a04Sfredette */ 173ec984a04Sfredette short exframesize[] = { 174ec984a04Sfredette FMT0SIZE, /* type 0 - normal (68020/030/040/060) */ 175ec984a04Sfredette FMT1SIZE, /* type 1 - throwaway (68020/030/040) */ 176ec984a04Sfredette FMT2SIZE, /* type 2 - normal 6-word (68020/030/040/060) */ 177ec984a04Sfredette FMT3SIZE, /* type 3 - FP post-instruction (68040/060) */ 178ec984a04Sfredette FMT4SIZE, /* type 4 - access error/fp disabled (68060) */ 179ec984a04Sfredette -1, -1, /* type 5-6 - undefined */ 180ec984a04Sfredette FMT7SIZE, /* type 7 - access error (68040) */ 181ec984a04Sfredette FMT8SIZE, /* type 8 - bus fault (68010) */ 182ec984a04Sfredette FMT9SIZE, /* type 9 - coprocessor mid-instruction (68020/030) */ 183ec984a04Sfredette FMTASIZE, /* type A - short bus fault (68020/030) */ 184ec984a04Sfredette FMTBSIZE, /* type B - long bus fault (68020/030) */ 185ec984a04Sfredette -1, -1, -1, -1 /* type C-F - undefined */ 186ec984a04Sfredette }; 187ec984a04Sfredette 188ec984a04Sfredette #define KDFAULT(c) (((c) & (SSW1_IF|SSW1_FCMASK)) == (FC_SUPERD)) 189ec984a04Sfredette #define WRFAULT(c) (((c) & (SSW1_IF|SSW1_DF|SSW1_RW)) == (0)) 190ec984a04Sfredette 191ec984a04Sfredette /* #define DEBUG XXX */ 192ec984a04Sfredette 193ec984a04Sfredette #ifdef DEBUG 1948b21bb00Sfredette unsigned short buserr_reg; 195ec984a04Sfredette int mmudebug = 0; 196ec984a04Sfredette int mmupid = -1; 197ec984a04Sfredette #define MDB_ISPID(p) ((p) == mmupid) 198ec984a04Sfredette #define MDB_FOLLOW 1 199ec984a04Sfredette #define MDB_WBFOLLOW 2 200ec984a04Sfredette #define MDB_WBFAILED 4 201ec984a04Sfredette #define MDB_CPFAULT 8 202ec984a04Sfredette #endif 203ec984a04Sfredette 204ec984a04Sfredette /* 205ec984a04Sfredette * trap and syscall both need the following work done before 206ec984a04Sfredette * returning to user mode. 207ec984a04Sfredette */ 208ec984a04Sfredette static void 20910b1a7beSchs userret(struct lwp *l, struct trapframe *tf, u_quad_t oticks) 210ec984a04Sfredette { 211d2275d51Sthorpej struct proc *p = l->l_proc; 212ec984a04Sfredette 213ef56cc40Scl /* Invoke MI userret code */ 214ef56cc40Scl mi_userret(l); 215ec984a04Sfredette 216ec984a04Sfredette /* 217ec984a04Sfredette * If profiling, charge system time to the trapped pc. 218ec984a04Sfredette */ 219ec984a04Sfredette if (p->p_flag & P_PROFIL) { 220ec984a04Sfredette extern int psratio; 221ec984a04Sfredette addupc_task(p, tf->tf_pc, 222ec984a04Sfredette (int)(p->p_sticks - oticks) * psratio); 223ec984a04Sfredette } 224ec984a04Sfredette 225d2275d51Sthorpej curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 226ec984a04Sfredette } 227ec984a04Sfredette 228ec984a04Sfredette /* 229ec984a04Sfredette * Used by the common m68k syscall() and child_return() functions. 230ec984a04Sfredette * XXX: Temporary until all m68k ports share common trap()/userret() code. 231ec984a04Sfredette */ 232d2275d51Sthorpej void machine_userret(struct lwp *, struct frame *, u_quad_t); 233ec984a04Sfredette 234ec984a04Sfredette void 23510b1a7beSchs machine_userret(struct lwp *l, struct frame *f, u_quad_t t) 236ec984a04Sfredette { 237ec984a04Sfredette 238d2275d51Sthorpej userret(l, &f->F_t, t); 239ec984a04Sfredette } 240ec984a04Sfredette 241ec984a04Sfredette /* 242ec984a04Sfredette * Trap is called from locore to handle most types of processor traps, 243ec984a04Sfredette * including events such as simulated software interrupts/AST's. 244ec984a04Sfredette * System calls are broken out for efficiency. 245ec984a04Sfredette */ 246ec984a04Sfredette /*ARGSUSED*/ 247ec984a04Sfredette void 24810b1a7beSchs trap(int type, u_int code, u_int v, struct trapframe tf) 249ec984a04Sfredette { 250d2275d51Sthorpej struct lwp *l; 251bbb634caSfredette struct proc *p; 25241692372Scl ksiginfo_t ksi; 25341692372Scl int tmp; 254ec984a04Sfredette u_quad_t sticks; 255ec984a04Sfredette 256ec984a04Sfredette uvmexp.traps++; 257d2275d51Sthorpej l = curlwp; 25841692372Scl 25968723a99Sthorpej KSI_INIT_TRAP(&ksi); 26041692372Scl ksi.ksi_trap = type & ~T_USER; 261ec984a04Sfredette 262d2275d51Sthorpej if (l == NULL) 263d2275d51Sthorpej l = &lwp0; 264d2275d51Sthorpej p = l->l_proc; 265d2275d51Sthorpej 266ec984a04Sfredette #ifdef DIAGNOSTIC 267ec984a04Sfredette if (p->p_addr == NULL) 268ec984a04Sfredette panic("trap: no pcb"); 269ec984a04Sfredette #endif 270ec984a04Sfredette 271ec984a04Sfredette if (USERMODE(tf.tf_sr)) { 272ec984a04Sfredette type |= T_USER; 273ec984a04Sfredette sticks = p->p_sticks; 274d2275d51Sthorpej l->l_md.md_regs = tf.tf_regs; 275ec984a04Sfredette } else { 276ec984a04Sfredette sticks = 0; 277ec984a04Sfredette /* XXX: Detect trap recursion? */ 278ec984a04Sfredette } 279ec984a04Sfredette 280ec984a04Sfredette switch (type) { 281ec984a04Sfredette default: 282ec984a04Sfredette dopanic: 283ec984a04Sfredette printf("trap type=0x%x, code=0x%x, v=0x%x\n", type, code, v); 284ec984a04Sfredette /* 285ec984a04Sfredette * Let the kernel debugger see the trap frame that 286ec984a04Sfredette * caused us to panic. This is a convenience so 287ec984a04Sfredette * one can see registers at the point of failure. 288ec984a04Sfredette */ 289ec984a04Sfredette tmp = splhigh(); 290ec984a04Sfredette #ifdef KGDB 291ec984a04Sfredette /* If connected, step or cont returns 1 */ 292ec984a04Sfredette if (kgdb_trap(type, &tf)) 293ec984a04Sfredette goto kgdb_cont; 294ec984a04Sfredette #endif 295ec984a04Sfredette #ifdef DDB 296ec984a04Sfredette (void) kdb_trap(type, (db_regs_t *) &tf); 297ec984a04Sfredette #endif 298ec984a04Sfredette #ifdef KGDB 299ec984a04Sfredette kgdb_cont: 300ec984a04Sfredette #endif 301ec984a04Sfredette splx(tmp); 302ec984a04Sfredette if (panicstr) { 303ec984a04Sfredette /* 304ec984a04Sfredette * Note: panic is smart enough to do: 305ec984a04Sfredette * boot(RB_AUTOBOOT | RB_NOSYNC, NULL) 306ec984a04Sfredette * if we call it again. 307ec984a04Sfredette */ 308ec984a04Sfredette panic("trap during panic!"); 309ec984a04Sfredette } 310ec984a04Sfredette regdump(&tf, 128); 311ec984a04Sfredette type &= ~T_USER; 312ec984a04Sfredette if ((u_int)type < trap_types) 313ec984a04Sfredette panic(trap_type[type]); 314ec984a04Sfredette panic("trap type 0x%x", type); 315ec984a04Sfredette 316ec984a04Sfredette case T_BUSERR: /* kernel bus error */ 317d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault == NULL) 318ec984a04Sfredette goto dopanic; 319ec984a04Sfredette /*FALLTHROUGH*/ 320ec984a04Sfredette 321ec984a04Sfredette copyfault: 322ec984a04Sfredette /* 323ec984a04Sfredette * If we have arranged to catch this fault in any of the 324ec984a04Sfredette * copy to/from user space routines, set PC to return to 325ec984a04Sfredette * indicated location and set flag informing buserror code 326ec984a04Sfredette * that it may need to clean up stack frame. 327ec984a04Sfredette */ 328ec984a04Sfredette tf.tf_stackadj = exframesize[tf.tf_format]; 329ec984a04Sfredette tf.tf_format = tf.tf_vector = 0; 330d2275d51Sthorpej tf.tf_pc = (int) l->l_addr->u_pcb.pcb_onfault; 331ec984a04Sfredette goto done; 332ec984a04Sfredette 333ec984a04Sfredette case T_BUSERR|T_USER: /* bus error */ 334ec984a04Sfredette case T_ADDRERR|T_USER: /* address error */ 33541692372Scl ksi.ksi_addr = (void *)v; 33641692372Scl ksi.ksi_signo = SIGBUS; 33741692372Scl ksi.ksi_code = (type == (T_BUSERR|T_USER)) ? 33841692372Scl BUS_OBJERR : BUS_ADRERR; 339ec984a04Sfredette break; 340ec984a04Sfredette 341ec984a04Sfredette case T_COPERR: /* kernel coprocessor violation */ 342ec984a04Sfredette case T_FMTERR|T_USER: /* do all RTE errors come in as T_USER? */ 343ec984a04Sfredette case T_FMTERR: /* ...just in case... */ 344ec984a04Sfredette /* 345ec984a04Sfredette * The user has most likely trashed the RTE or FP state info 346ec984a04Sfredette * in the stack frame of a signal handler. 347ec984a04Sfredette */ 348ec984a04Sfredette printf("pid %d: kernel %s exception\n", p->p_pid, 349ec984a04Sfredette type==T_COPERR ? "coprocessor" : "format"); 350ec984a04Sfredette type |= T_USER; 351ec984a04Sfredette SIGACTION(p, SIGILL).sa_handler = SIG_DFL; 352ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigignore, SIGILL); 353ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigcatch, SIGILL); 354ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigmask, SIGILL); 35541692372Scl ksi.ksi_signo = SIGILL; 35641692372Scl ksi.ksi_addr = (void *)(int)tf.tf_format; 35741692372Scl ksi.ksi_code = (type == T_COPERR) ? 35841692372Scl ILL_COPROC : ILL_ILLOPC; 359ec984a04Sfredette break; 360ec984a04Sfredette 361ec984a04Sfredette case T_COPERR|T_USER: /* user coprocessor violation */ 362ec984a04Sfredette /* What is a proper response here? */ 36341692372Scl ksi.ksi_signo = SIGFPE; 36441692372Scl ksi.ksi_code = FPE_FLTINV; 365ec984a04Sfredette break; 366ec984a04Sfredette 367ec984a04Sfredette case T_FPERR|T_USER: /* 68881 exceptions */ 368ec984a04Sfredette /* 369ec984a04Sfredette * We pass along the 68881 status register which locore stashed 370ec984a04Sfredette * in code for us. Note that there is a possibility that the 371ec984a04Sfredette * bit pattern of this register will conflict with one of the 372ec984a04Sfredette * FPE_* codes defined in signal.h. Fortunately for us, the 373ec984a04Sfredette * only such codes we use are all in the range 1-7 and the low 374ec984a04Sfredette * 3 bits of the status register are defined as 0 so there is 375ec984a04Sfredette * no clash. 376ec984a04Sfredette */ 37741692372Scl ksi.ksi_signo = SIGFPE; 37841692372Scl ksi.ksi_addr = (void *)code; 379ec984a04Sfredette break; 380ec984a04Sfredette 381ec984a04Sfredette case T_FPEMULI: /* FPU faults in supervisor mode */ 382ec984a04Sfredette case T_FPEMULD: 383ec984a04Sfredette if (nofault) /* Doing FPU probe? */ 384ec984a04Sfredette longjmp(nofault); 385ec984a04Sfredette goto dopanic; 386ec984a04Sfredette 3875d1e8b27Swiz case T_FPEMULI|T_USER: /* unimplemented FP instruction */ 388ec984a04Sfredette case T_FPEMULD|T_USER: /* unimplemented FP data type */ 389ec984a04Sfredette #ifdef FPU_EMULATE 39041692372Scl if (fpu_emulate(&tf, &l->l_addr->u_pcb.pcb_fpregs, &ksi) == 0) 39141692372Scl ; /* XXX - Deal with tracing? (tf.tf_sr & PSL_T) */ 392ec984a04Sfredette #else 393ec984a04Sfredette uprintf("pid %d killed: no floating point support\n", p->p_pid); 39441692372Scl ksi.ksi_signo = SIGILL; 39541692372Scl ksi.ksi_code = ILL_ILLOPC; 396ec984a04Sfredette #endif 397ec984a04Sfredette break; 398ec984a04Sfredette 399ec984a04Sfredette case T_ILLINST|T_USER: /* illegal instruction fault */ 400ec984a04Sfredette case T_PRIVINST|T_USER: /* privileged instruction fault */ 40141692372Scl ksi.ksi_addr = (void *)(int)tf.tf_format; 40241692372Scl ksi.ksi_signo = SIGILL; 40341692372Scl ksi.ksi_code = (type == (T_PRIVINST|T_USER)) ? 40441692372Scl ILL_PRVOPC : ILL_ILLOPC; 405ec984a04Sfredette break; 406ec984a04Sfredette 407ec984a04Sfredette case T_ZERODIV|T_USER: /* Divide by zero */ 40841692372Scl ksi.ksi_code = FPE_FLTDIV; 409ec984a04Sfredette case T_CHKINST|T_USER: /* CHK instruction trap */ 410ec984a04Sfredette case T_TRAPVINST|T_USER: /* TRAPV instruction trap */ 41141692372Scl ksi.ksi_addr = (void *)(int)tf.tf_format; 41241692372Scl ksi.ksi_signo = SIGFPE; 413ec984a04Sfredette break; 414ec984a04Sfredette 415ec984a04Sfredette /* 416ec984a04Sfredette * XXX: Trace traps are a nightmare. 417ec984a04Sfredette * 418ec984a04Sfredette * HP-UX uses trap #1 for breakpoints, 419ec984a04Sfredette * NetBSD/m68k uses trap #2, 420ec984a04Sfredette * SUN 3.x uses trap #15, 421ec984a04Sfredette * DDB and KGDB uses trap #15 (for kernel breakpoints; 422ec984a04Sfredette * handled elsewhere). 423ec984a04Sfredette * 424ec984a04Sfredette * NetBSD and HP-UX traps both get mapped by locore.s into T_TRACE. 425ec984a04Sfredette * SUN 3.x traps get passed through as T_TRAP15 and are not really 426ec984a04Sfredette * supported yet. 427ec984a04Sfredette * 428ec984a04Sfredette * XXX: We should never get kernel-mode T_TRAP15 429ec984a04Sfredette * XXX: because locore.s now gives them special treatment. 430ec984a04Sfredette */ 431ec984a04Sfredette case T_TRAP15: /* kernel breakpoint */ 432ec984a04Sfredette tf.tf_sr &= ~PSL_T; 433ec984a04Sfredette goto done; 434ec984a04Sfredette 435ec984a04Sfredette case T_TRACE|T_USER: /* user trace trap */ 436ec984a04Sfredette #ifdef COMPAT_SUNOS 437ec984a04Sfredette /* 438ec984a04Sfredette * SunOS uses Trap #2 for a "CPU cache flush" 439ec984a04Sfredette * Just flush the on-chip caches and return. 440ec984a04Sfredette * XXX - Too bad NetBSD uses trap 2... 441ec984a04Sfredette */ 442ec984a04Sfredette if (p->p_emul == &emul_sunos) { 443ec984a04Sfredette /* get out fast */ 444ec984a04Sfredette goto done; 445ec984a04Sfredette } 446ec984a04Sfredette #endif 447ec984a04Sfredette /* FALLTHROUGH */ 448ec984a04Sfredette case T_TRACE: /* tracing a trap instruction */ 449ec984a04Sfredette case T_TRAP15|T_USER: /* SUN user trace trap */ 450ec984a04Sfredette tf.tf_sr &= ~PSL_T; 45141692372Scl ksi.ksi_signo = SIGTRAP; 452ec984a04Sfredette break; 453ec984a04Sfredette 454ec984a04Sfredette case T_ASTFLT: /* system async trap, cannot happen */ 455ec984a04Sfredette goto dopanic; 456ec984a04Sfredette 457ec984a04Sfredette case T_ASTFLT|T_USER: /* user async trap */ 458ec984a04Sfredette astpending = 0; 459ec984a04Sfredette /* T_SSIR is not used on a Sun2. */ 460ec984a04Sfredette if (p->p_flag & P_OWEUPC) { 461ec984a04Sfredette p->p_flag &= ~P_OWEUPC; 462ec984a04Sfredette ADDUPROF(p); 463ec984a04Sfredette } 464d2275d51Sthorpej if (want_resched) 465d2275d51Sthorpej preempt(0); 466ec984a04Sfredette goto douret; 467ec984a04Sfredette 468ec984a04Sfredette case T_MMUFLT: /* kernel mode page fault */ 469ec984a04Sfredette /* Hacks to avoid calling VM code from debugger. */ 470ec984a04Sfredette #ifdef DDB 471ec984a04Sfredette if (db_recover != 0) 472ec984a04Sfredette goto dopanic; 473ec984a04Sfredette #endif 474ec984a04Sfredette #ifdef KGDB 475ec984a04Sfredette if (kgdb_recover != 0) 476ec984a04Sfredette goto dopanic; 477ec984a04Sfredette #endif 478ec984a04Sfredette /* 479ec984a04Sfredette * If we were doing profiling ticks or other user mode 480ec984a04Sfredette * stuff from interrupt code, Just Say No. 481ec984a04Sfredette */ 482d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault == (caddr_t)fubail || 483d2275d51Sthorpej l->l_addr->u_pcb.pcb_onfault == (caddr_t)subail) 484ec984a04Sfredette { 485ec984a04Sfredette #ifdef DEBUG 486ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 487ec984a04Sfredette printf("trap: copyfault fu/su bail\n"); 488ec984a04Sfredette Debugger(); 489ec984a04Sfredette } 490ec984a04Sfredette #endif 491ec984a04Sfredette goto copyfault; 492ec984a04Sfredette } 493ec984a04Sfredette /*FALLTHROUGH*/ 494ec984a04Sfredette 495ec984a04Sfredette case T_MMUFLT|T_USER: { /* page fault */ 496bbb634caSfredette vaddr_t va; 497bbb634caSfredette struct vmspace *vm = p->p_vmspace; 498bbb634caSfredette struct vm_map *map; 499ec984a04Sfredette int rv; 500ec984a04Sfredette vm_prot_t ftype; 501821ec03eSchs extern struct vm_map *kernel_map; 502ec984a04Sfredette 503ec984a04Sfredette #ifdef DEBUG 504ec984a04Sfredette if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 505ec984a04Sfredette printf("trap: T_MMUFLT pid=%d, code=0x%x, v=0x%x, pc=0x%x, sr=0x%x\n", 506ec984a04Sfredette p->p_pid, code, v, tf.tf_pc, tf.tf_sr); 507ec984a04Sfredette #endif 508ec984a04Sfredette 509ec984a04Sfredette /* 510ec984a04Sfredette * It is only a kernel address space fault iff: 511ec984a04Sfredette * 1. (type & T_USER) == 0 and: (2 or 3) 512ec984a04Sfredette * 2. pcb_onfault not set or 513ec984a04Sfredette * 3. pcb_onfault set but supervisor space data fault 514ec984a04Sfredette * The last can occur during an exec() copyin where the 515ec984a04Sfredette * argument space is lazy-allocated. 516ec984a04Sfredette */ 517ec984a04Sfredette map = &vm->vm_map; 518ec984a04Sfredette if ((type & T_USER) == 0) { 519ec984a04Sfredette /* supervisor mode fault */ 520d2275d51Sthorpej if ((l->l_addr->u_pcb.pcb_onfault == NULL) || KDFAULT(code)) 521ec984a04Sfredette map = kernel_map; 5223c10927eScl } else if (l->l_flag & L_SA) { 523ea5ec021Scl l->l_savp->savp_faultaddr = (vaddr_t)v; 5243c10927eScl l->l_flag |= L_SA_PAGEFAULT; 525ec984a04Sfredette } 526ec984a04Sfredette 527ec984a04Sfredette if (WRFAULT(code)) 528b744097aSchs ftype = VM_PROT_WRITE; 529ec984a04Sfredette else 530ec984a04Sfredette ftype = VM_PROT_READ; 531bbb634caSfredette va = m68k_trunc_page((vaddr_t)v); 532ec984a04Sfredette 533ec984a04Sfredette /* 534ec984a04Sfredette * Need to resolve the fault. 535ec984a04Sfredette * 536ec984a04Sfredette * We give the pmap code a chance to resolve faults by 537ec984a04Sfredette * reloading translations that it was forced to unload. 538ec984a04Sfredette * This function does that, and calls vm_fault if it 539ec984a04Sfredette * could not resolve the fault by reloading the MMU. 540ec984a04Sfredette * This function may also, for example, disallow any 541ec984a04Sfredette * faults in the kernel text segment, etc. 542ec984a04Sfredette */ 543ec984a04Sfredette rv = _pmap_fault(map, va, ftype); 544ec984a04Sfredette 545ec984a04Sfredette #ifdef DEBUG 546ec984a04Sfredette if (rv && MDB_ISPID(p->p_pid)) { 54747fbb9d8Sdrochner printf("vm_fault(%p, 0x%lx, 0x%x) -> 0x%x\n", 548ec984a04Sfredette map, va, ftype, rv); 549ec984a04Sfredette if (mmudebug & MDB_WBFAILED) 550ec984a04Sfredette Debugger(); 551ec984a04Sfredette } 552ec984a04Sfredette #endif /* DEBUG */ 553ec984a04Sfredette 554ec984a04Sfredette /* 555ec984a04Sfredette * If this was a stack access we keep track of the maximum 556ec984a04Sfredette * accessed stack size. Also, if vm_fault gets a protection 557ec984a04Sfredette * failure it is due to accessing the stack region outside 558ec984a04Sfredette * the current limit and we need to reflect that as an access 559ec984a04Sfredette * error. 560ec984a04Sfredette */ 561ec984a04Sfredette if (rv == 0) { 56264969161Sjdolecek if (map != kernel_map && (caddr_t)va >= vm->vm_maxsaddr) 56364969161Sjdolecek uvm_grow(p, va); 564ec984a04Sfredette 5653c10927eScl if ((type & T_USER) != 0) 5663c10927eScl l->l_flag &= ~L_SA_PAGEFAULT; 567ec984a04Sfredette goto finish; 5683c10927eScl } 56941692372Scl if (rv == EACCES) { 57041692372Scl ksi.ksi_code = SEGV_ACCERR; 57141692372Scl rv = EFAULT; 57241692372Scl } else 57341692372Scl ksi.ksi_code = SEGV_MAPERR; 574ec984a04Sfredette if ((type & T_USER) == 0) { 575ec984a04Sfredette /* supervisor mode fault */ 576d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault) { 577ec984a04Sfredette #ifdef DEBUG 578ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 579ec984a04Sfredette printf("trap: copyfault pcb_onfault\n"); 580ec984a04Sfredette Debugger(); 581ec984a04Sfredette } 582ec984a04Sfredette #endif 583ec984a04Sfredette goto copyfault; 584ec984a04Sfredette } 58547fbb9d8Sdrochner printf("vm_fault(%p, 0x%lx, 0x%x) -> 0x%x\n", 586ec984a04Sfredette map, va, ftype, rv); 587ec984a04Sfredette goto dopanic; 588ec984a04Sfredette } 5893c10927eScl l->l_flag &= ~L_SA_PAGEFAULT; 59041692372Scl ksi.ksi_addr = (void *)v; 591ec984a04Sfredette if (rv == ENOMEM) { 592ec984a04Sfredette printf("UVM: pid %d (%s), uid %d killed: out of swap\n", 593ec984a04Sfredette p->p_pid, p->p_comm, 5948ccb6c93Selad p->p_cred ? 5958ccb6c93Selad kauth_cred_geteuid(p->p_cred) : -1); 59641692372Scl ksi.ksi_signo = SIGKILL; 597ec984a04Sfredette } else { 59841692372Scl ksi.ksi_signo = SIGSEGV; 599ec984a04Sfredette } 600ec984a04Sfredette break; 601ec984a04Sfredette } /* T_MMUFLT */ 602ec984a04Sfredette } /* switch */ 603ec984a04Sfredette 604ec984a04Sfredette finish: 605ec984a04Sfredette /* If trap was from supervisor mode, just return. */ 606ec984a04Sfredette if ((type & T_USER) == 0) 607ec984a04Sfredette goto done; 608ec984a04Sfredette /* Post a signal if necessary. */ 60941692372Scl if (ksi.ksi_signo) 61041692372Scl trapsignal(l, &ksi); 611ec984a04Sfredette douret: 612d2275d51Sthorpej userret(l, &tf, sticks); 613ec984a04Sfredette 614ec984a04Sfredette done:; 615ec984a04Sfredette /* XXX: Detect trap recursion? */ 616ec984a04Sfredette } 617ec984a04Sfredette 618ec984a04Sfredette /* 619ec984a04Sfredette * This is used if we hit a kernel breakpoint or trace trap 620ec984a04Sfredette * when there is no debugger installed (or not attached). 621ec984a04Sfredette * Drop into the PROM temporarily... 622ec984a04Sfredette */ 623ec984a04Sfredette int 62410b1a7beSchs _nodb_trap(int type, struct trapframe *tf) 625ec984a04Sfredette { 626ec984a04Sfredette 627ec984a04Sfredette printf("\r\nKernel "); 628ec984a04Sfredette if ((0 <= type) && (type < trap_types)) 629ec984a04Sfredette printf("%s", trap_type[type]); 630ec984a04Sfredette else 631ec984a04Sfredette printf("trap 0x%x", type); 632ec984a04Sfredette printf(", frame=%p\r\n", tf); 633ec984a04Sfredette printf("No debugger; doing PROM abort.\r\n"); 634ec984a04Sfredette printf("To continue, type: c <RETURN>\r\n"); 635ec984a04Sfredette prom_abort(); 636ec984a04Sfredette /* OK then, just resume... */ 637ec984a04Sfredette tf->tf_sr &= ~PSL_T; 638ec984a04Sfredette return(1); 639ec984a04Sfredette } 640ec984a04Sfredette 641ec984a04Sfredette /* 642ec984a04Sfredette * This is called by locore for supervisor-mode trace and 643ec984a04Sfredette * breakpoint traps. This is separate from trap() above 644ec984a04Sfredette * so that breakpoints in trap() will work. 645ec984a04Sfredette * 646ec984a04Sfredette * If we have both DDB and KGDB, let KGDB see it first, 647ec984a04Sfredette * because KGDB will just return 0 if not connected. 648ec984a04Sfredette */ 649ec984a04Sfredette void 65010b1a7beSchs trap_kdebug(int type, struct trapframe tf) 651ec984a04Sfredette { 652ec984a04Sfredette 653ec984a04Sfredette #ifdef KGDB 654ec984a04Sfredette /* Let KGDB handle it (if connected) */ 655ec984a04Sfredette if (kgdb_trap(type, &tf)) 656ec984a04Sfredette return; 657ec984a04Sfredette #endif 658ec984a04Sfredette #ifdef DDB 659ec984a04Sfredette /* Let DDB handle it. */ 660ec984a04Sfredette if (kdb_trap(type, &tf)) 661ec984a04Sfredette return; 662ec984a04Sfredette #endif 663ec984a04Sfredette 664ec984a04Sfredette /* Drop into the PROM temporarily... */ 665ec984a04Sfredette (void)_nodb_trap(type, &tf); 666ec984a04Sfredette } 667ec984a04Sfredette 668ec984a04Sfredette /* 669ec984a04Sfredette * Called by locore.s for an unexpected interrupt. 670ec984a04Sfredette * XXX - Almost identical to trap_kdebug... 671ec984a04Sfredette */ 672ec984a04Sfredette void 67310b1a7beSchs straytrap(struct trapframe tf) 674ec984a04Sfredette { 675ec984a04Sfredette int type = -1; 676ec984a04Sfredette 677ec984a04Sfredette printf("unexpected trap; vector=0x%x at pc=0x%x\n", 678ec984a04Sfredette tf.tf_vector, tf.tf_pc); 679ec984a04Sfredette 680ec984a04Sfredette #ifdef KGDB 681ec984a04Sfredette /* Let KGDB handle it (if connected) */ 682ec984a04Sfredette if (kgdb_trap(type, &tf)) 683ec984a04Sfredette return; 684ec984a04Sfredette #endif 685ec984a04Sfredette #ifdef DDB 686ec984a04Sfredette /* Let DDB handle it. */ 687ec984a04Sfredette if (kdb_trap(type, &tf)) 688ec984a04Sfredette return; 689ec984a04Sfredette #endif 690ec984a04Sfredette 691ec984a04Sfredette /* Drop into the PROM temporarily... */ 692ec984a04Sfredette (void)_nodb_trap(type, &tf); 693ec984a04Sfredette } 694