1*64969161Sjdolecek /* $NetBSD: trap.c,v 1.18 2004/08/28 17:53:02 jdolecek 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*64969161Sjdolecek __KERNEL_RCSID(0, "$NetBSD: trap.c,v 1.18 2004/08/28 17:53:02 jdolecek 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> 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 */ 137ec984a04Sfredette void trap __P((int type, u_int code, u_int v, struct trapframe)); 138ec984a04Sfredette void trap_kdebug __P((int type, struct trapframe tf)); 139ec984a04Sfredette int _nodb_trap __P((int type, struct trapframe *)); 140ec984a04Sfredette void straytrap __P((struct trapframe)); 141ec984a04Sfredette 142d2275d51Sthorpej static void userret __P((struct lwp *, struct trapframe *, u_quad_t)); 143ec984a04Sfredette 144ec984a04Sfredette int astpending; 145ec984a04Sfredette int want_resched; 146ec984a04Sfredette 147ec984a04Sfredette 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 208d2275d51Sthorpej userret(l, tf, oticks) 209d2275d51Sthorpej struct lwp *l; 210bbb634caSfredette struct trapframe *tf; 211ec984a04Sfredette u_quad_t oticks; 212ec984a04Sfredette { 213d2275d51Sthorpej struct proc *p = l->l_proc; 214ec984a04Sfredette 215ef56cc40Scl /* Invoke MI userret code */ 216ef56cc40Scl mi_userret(l); 217ec984a04Sfredette 218ec984a04Sfredette /* 219ec984a04Sfredette * If profiling, charge system time to the trapped pc. 220ec984a04Sfredette */ 221ec984a04Sfredette if (p->p_flag & P_PROFIL) { 222ec984a04Sfredette extern int psratio; 223ec984a04Sfredette addupc_task(p, tf->tf_pc, 224ec984a04Sfredette (int)(p->p_sticks - oticks) * psratio); 225ec984a04Sfredette } 226ec984a04Sfredette 227d2275d51Sthorpej curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 228ec984a04Sfredette } 229ec984a04Sfredette 230ec984a04Sfredette /* 231ec984a04Sfredette * Used by the common m68k syscall() and child_return() functions. 232ec984a04Sfredette * XXX: Temporary until all m68k ports share common trap()/userret() code. 233ec984a04Sfredette */ 234d2275d51Sthorpej void machine_userret(struct lwp *, struct frame *, u_quad_t); 235ec984a04Sfredette 236ec984a04Sfredette void 237d2275d51Sthorpej machine_userret(l, f, t) 238d2275d51Sthorpej struct lwp *l; 239ec984a04Sfredette struct frame *f; 240ec984a04Sfredette u_quad_t t; 241ec984a04Sfredette { 242ec984a04Sfredette 243d2275d51Sthorpej userret(l, &f->F_t, t); 244ec984a04Sfredette } 245ec984a04Sfredette 246ec984a04Sfredette /* 247ec984a04Sfredette * Trap is called from locore to handle most types of processor traps, 248ec984a04Sfredette * including events such as simulated software interrupts/AST's. 249ec984a04Sfredette * System calls are broken out for efficiency. 250ec984a04Sfredette */ 251ec984a04Sfredette /*ARGSUSED*/ 252ec984a04Sfredette void 253ec984a04Sfredette trap(type, code, v, tf) 254ec984a04Sfredette int type; 255ec984a04Sfredette u_int code, v; 256ec984a04Sfredette struct trapframe tf; 257ec984a04Sfredette { 258d2275d51Sthorpej struct lwp *l; 259bbb634caSfredette struct proc *p; 26041692372Scl ksiginfo_t ksi; 26141692372Scl int tmp; 262ec984a04Sfredette u_quad_t sticks; 263ec984a04Sfredette 264ec984a04Sfredette uvmexp.traps++; 265d2275d51Sthorpej l = curlwp; 26641692372Scl 26768723a99Sthorpej KSI_INIT_TRAP(&ksi); 26841692372Scl ksi.ksi_trap = type & ~T_USER; 269ec984a04Sfredette 270d2275d51Sthorpej if (l == NULL) 271d2275d51Sthorpej l = &lwp0; 272d2275d51Sthorpej p = l->l_proc; 273d2275d51Sthorpej 274ec984a04Sfredette #ifdef DIAGNOSTIC 275ec984a04Sfredette if (p->p_addr == NULL) 276ec984a04Sfredette panic("trap: no pcb"); 277ec984a04Sfredette #endif 278ec984a04Sfredette 279ec984a04Sfredette if (USERMODE(tf.tf_sr)) { 280ec984a04Sfredette type |= T_USER; 281ec984a04Sfredette sticks = p->p_sticks; 282d2275d51Sthorpej l->l_md.md_regs = tf.tf_regs; 283ec984a04Sfredette } else { 284ec984a04Sfredette sticks = 0; 285ec984a04Sfredette /* XXX: Detect trap recursion? */ 286ec984a04Sfredette } 287ec984a04Sfredette 288ec984a04Sfredette switch (type) { 289ec984a04Sfredette default: 290ec984a04Sfredette dopanic: 291ec984a04Sfredette printf("trap type=0x%x, code=0x%x, v=0x%x\n", type, code, v); 292ec984a04Sfredette /* 293ec984a04Sfredette * Let the kernel debugger see the trap frame that 294ec984a04Sfredette * caused us to panic. This is a convenience so 295ec984a04Sfredette * one can see registers at the point of failure. 296ec984a04Sfredette */ 297ec984a04Sfredette tmp = splhigh(); 298ec984a04Sfredette #ifdef KGDB 299ec984a04Sfredette /* If connected, step or cont returns 1 */ 300ec984a04Sfredette if (kgdb_trap(type, &tf)) 301ec984a04Sfredette goto kgdb_cont; 302ec984a04Sfredette #endif 303ec984a04Sfredette #ifdef DDB 304ec984a04Sfredette (void) kdb_trap(type, (db_regs_t *) &tf); 305ec984a04Sfredette #endif 306ec984a04Sfredette #ifdef KGDB 307ec984a04Sfredette kgdb_cont: 308ec984a04Sfredette #endif 309ec984a04Sfredette splx(tmp); 310ec984a04Sfredette if (panicstr) { 311ec984a04Sfredette /* 312ec984a04Sfredette * Note: panic is smart enough to do: 313ec984a04Sfredette * boot(RB_AUTOBOOT | RB_NOSYNC, NULL) 314ec984a04Sfredette * if we call it again. 315ec984a04Sfredette */ 316ec984a04Sfredette panic("trap during panic!"); 317ec984a04Sfredette } 318ec984a04Sfredette regdump(&tf, 128); 319ec984a04Sfredette type &= ~T_USER; 320ec984a04Sfredette if ((u_int)type < trap_types) 321ec984a04Sfredette panic(trap_type[type]); 322ec984a04Sfredette panic("trap type 0x%x", type); 323ec984a04Sfredette 324ec984a04Sfredette case T_BUSERR: /* kernel bus error */ 325d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault == NULL) 326ec984a04Sfredette goto dopanic; 327ec984a04Sfredette /*FALLTHROUGH*/ 328ec984a04Sfredette 329ec984a04Sfredette copyfault: 330ec984a04Sfredette /* 331ec984a04Sfredette * If we have arranged to catch this fault in any of the 332ec984a04Sfredette * copy to/from user space routines, set PC to return to 333ec984a04Sfredette * indicated location and set flag informing buserror code 334ec984a04Sfredette * that it may need to clean up stack frame. 335ec984a04Sfredette */ 336ec984a04Sfredette tf.tf_stackadj = exframesize[tf.tf_format]; 337ec984a04Sfredette tf.tf_format = tf.tf_vector = 0; 338d2275d51Sthorpej tf.tf_pc = (int) l->l_addr->u_pcb.pcb_onfault; 339ec984a04Sfredette goto done; 340ec984a04Sfredette 341ec984a04Sfredette case T_BUSERR|T_USER: /* bus error */ 342ec984a04Sfredette case T_ADDRERR|T_USER: /* address error */ 34341692372Scl ksi.ksi_addr = (void *)v; 34441692372Scl ksi.ksi_signo = SIGBUS; 34541692372Scl ksi.ksi_code = (type == (T_BUSERR|T_USER)) ? 34641692372Scl BUS_OBJERR : BUS_ADRERR; 347ec984a04Sfredette break; 348ec984a04Sfredette 349ec984a04Sfredette case T_COPERR: /* kernel coprocessor violation */ 350ec984a04Sfredette case T_FMTERR|T_USER: /* do all RTE errors come in as T_USER? */ 351ec984a04Sfredette case T_FMTERR: /* ...just in case... */ 352ec984a04Sfredette /* 353ec984a04Sfredette * The user has most likely trashed the RTE or FP state info 354ec984a04Sfredette * in the stack frame of a signal handler. 355ec984a04Sfredette */ 356ec984a04Sfredette printf("pid %d: kernel %s exception\n", p->p_pid, 357ec984a04Sfredette type==T_COPERR ? "coprocessor" : "format"); 358ec984a04Sfredette type |= T_USER; 359ec984a04Sfredette SIGACTION(p, SIGILL).sa_handler = SIG_DFL; 360ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigignore, SIGILL); 361ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigcatch, SIGILL); 362ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigmask, SIGILL); 36341692372Scl ksi.ksi_signo = SIGILL; 36441692372Scl ksi.ksi_addr = (void *)(int)tf.tf_format; 36541692372Scl ksi.ksi_code = (type == T_COPERR) ? 36641692372Scl ILL_COPROC : ILL_ILLOPC; 367ec984a04Sfredette break; 368ec984a04Sfredette 369ec984a04Sfredette case T_COPERR|T_USER: /* user coprocessor violation */ 370ec984a04Sfredette /* What is a proper response here? */ 37141692372Scl ksi.ksi_signo = SIGFPE; 37241692372Scl ksi.ksi_code = FPE_FLTINV; 373ec984a04Sfredette break; 374ec984a04Sfredette 375ec984a04Sfredette case T_FPERR|T_USER: /* 68881 exceptions */ 376ec984a04Sfredette /* 377ec984a04Sfredette * We pass along the 68881 status register which locore stashed 378ec984a04Sfredette * in code for us. Note that there is a possibility that the 379ec984a04Sfredette * bit pattern of this register will conflict with one of the 380ec984a04Sfredette * FPE_* codes defined in signal.h. Fortunately for us, the 381ec984a04Sfredette * only such codes we use are all in the range 1-7 and the low 382ec984a04Sfredette * 3 bits of the status register are defined as 0 so there is 383ec984a04Sfredette * no clash. 384ec984a04Sfredette */ 38541692372Scl ksi.ksi_signo = SIGFPE; 38641692372Scl ksi.ksi_addr = (void *)code; 387ec984a04Sfredette break; 388ec984a04Sfredette 389ec984a04Sfredette case T_FPEMULI: /* FPU faults in supervisor mode */ 390ec984a04Sfredette case T_FPEMULD: 391ec984a04Sfredette if (nofault) /* Doing FPU probe? */ 392ec984a04Sfredette longjmp(nofault); 393ec984a04Sfredette goto dopanic; 394ec984a04Sfredette 395ec984a04Sfredette case T_FPEMULI|T_USER: /* unimplemented FP instuction */ 396ec984a04Sfredette case T_FPEMULD|T_USER: /* unimplemented FP data type */ 397ec984a04Sfredette #ifdef FPU_EMULATE 39841692372Scl if (fpu_emulate(&tf, &l->l_addr->u_pcb.pcb_fpregs, &ksi) == 0) 39941692372Scl ; /* XXX - Deal with tracing? (tf.tf_sr & PSL_T) */ 400ec984a04Sfredette #else 401ec984a04Sfredette uprintf("pid %d killed: no floating point support\n", p->p_pid); 40241692372Scl ksi.ksi_signo = SIGILL; 40341692372Scl ksi.ksi_code = ILL_ILLOPC; 404ec984a04Sfredette #endif 405ec984a04Sfredette break; 406ec984a04Sfredette 407ec984a04Sfredette case T_ILLINST|T_USER: /* illegal instruction fault */ 408ec984a04Sfredette case T_PRIVINST|T_USER: /* privileged instruction fault */ 40941692372Scl ksi.ksi_addr = (void *)(int)tf.tf_format; 41041692372Scl ksi.ksi_signo = SIGILL; 41141692372Scl ksi.ksi_code = (type == (T_PRIVINST|T_USER)) ? 41241692372Scl ILL_PRVOPC : ILL_ILLOPC; 413ec984a04Sfredette break; 414ec984a04Sfredette 415ec984a04Sfredette case T_ZERODIV|T_USER: /* Divide by zero */ 41641692372Scl ksi.ksi_code = FPE_FLTDIV; 417ec984a04Sfredette case T_CHKINST|T_USER: /* CHK instruction trap */ 418ec984a04Sfredette case T_TRAPVINST|T_USER: /* TRAPV instruction trap */ 41941692372Scl ksi.ksi_addr = (void *)(int)tf.tf_format; 42041692372Scl ksi.ksi_signo = SIGFPE; 421ec984a04Sfredette break; 422ec984a04Sfredette 423ec984a04Sfredette /* 424ec984a04Sfredette * XXX: Trace traps are a nightmare. 425ec984a04Sfredette * 426ec984a04Sfredette * HP-UX uses trap #1 for breakpoints, 427ec984a04Sfredette * NetBSD/m68k uses trap #2, 428ec984a04Sfredette * SUN 3.x uses trap #15, 429ec984a04Sfredette * DDB and KGDB uses trap #15 (for kernel breakpoints; 430ec984a04Sfredette * handled elsewhere). 431ec984a04Sfredette * 432ec984a04Sfredette * NetBSD and HP-UX traps both get mapped by locore.s into T_TRACE. 433ec984a04Sfredette * SUN 3.x traps get passed through as T_TRAP15 and are not really 434ec984a04Sfredette * supported yet. 435ec984a04Sfredette * 436ec984a04Sfredette * XXX: We should never get kernel-mode T_TRAP15 437ec984a04Sfredette * XXX: because locore.s now gives them special treatment. 438ec984a04Sfredette */ 439ec984a04Sfredette case T_TRAP15: /* kernel breakpoint */ 440ec984a04Sfredette tf.tf_sr &= ~PSL_T; 441ec984a04Sfredette goto done; 442ec984a04Sfredette 443ec984a04Sfredette case T_TRACE|T_USER: /* user trace trap */ 444ec984a04Sfredette #ifdef COMPAT_SUNOS 445ec984a04Sfredette /* 446ec984a04Sfredette * SunOS uses Trap #2 for a "CPU cache flush" 447ec984a04Sfredette * Just flush the on-chip caches and return. 448ec984a04Sfredette * XXX - Too bad NetBSD uses trap 2... 449ec984a04Sfredette */ 450ec984a04Sfredette if (p->p_emul == &emul_sunos) { 451ec984a04Sfredette /* get out fast */ 452ec984a04Sfredette goto done; 453ec984a04Sfredette } 454ec984a04Sfredette #endif 455ec984a04Sfredette /* FALLTHROUGH */ 456ec984a04Sfredette case T_TRACE: /* tracing a trap instruction */ 457ec984a04Sfredette case T_TRAP15|T_USER: /* SUN user trace trap */ 458ec984a04Sfredette tf.tf_sr &= ~PSL_T; 45941692372Scl ksi.ksi_signo = SIGTRAP; 460ec984a04Sfredette break; 461ec984a04Sfredette 462ec984a04Sfredette case T_ASTFLT: /* system async trap, cannot happen */ 463ec984a04Sfredette goto dopanic; 464ec984a04Sfredette 465ec984a04Sfredette case T_ASTFLT|T_USER: /* user async trap */ 466ec984a04Sfredette astpending = 0; 467ec984a04Sfredette /* T_SSIR is not used on a Sun2. */ 468ec984a04Sfredette if (p->p_flag & P_OWEUPC) { 469ec984a04Sfredette p->p_flag &= ~P_OWEUPC; 470ec984a04Sfredette ADDUPROF(p); 471ec984a04Sfredette } 472d2275d51Sthorpej if (want_resched) 473d2275d51Sthorpej preempt(0); 474ec984a04Sfredette goto douret; 475ec984a04Sfredette 476ec984a04Sfredette case T_MMUFLT: /* kernel mode page fault */ 477ec984a04Sfredette /* Hacks to avoid calling VM code from debugger. */ 478ec984a04Sfredette #ifdef DDB 479ec984a04Sfredette if (db_recover != 0) 480ec984a04Sfredette goto dopanic; 481ec984a04Sfredette #endif 482ec984a04Sfredette #ifdef KGDB 483ec984a04Sfredette if (kgdb_recover != 0) 484ec984a04Sfredette goto dopanic; 485ec984a04Sfredette #endif 486ec984a04Sfredette /* 487ec984a04Sfredette * If we were doing profiling ticks or other user mode 488ec984a04Sfredette * stuff from interrupt code, Just Say No. 489ec984a04Sfredette */ 490d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault == (caddr_t)fubail || 491d2275d51Sthorpej l->l_addr->u_pcb.pcb_onfault == (caddr_t)subail) 492ec984a04Sfredette { 493ec984a04Sfredette #ifdef DEBUG 494ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 495ec984a04Sfredette printf("trap: copyfault fu/su bail\n"); 496ec984a04Sfredette Debugger(); 497ec984a04Sfredette } 498ec984a04Sfredette #endif 499ec984a04Sfredette goto copyfault; 500ec984a04Sfredette } 501ec984a04Sfredette /*FALLTHROUGH*/ 502ec984a04Sfredette 503ec984a04Sfredette case T_MMUFLT|T_USER: { /* page fault */ 504bbb634caSfredette vaddr_t va; 505bbb634caSfredette struct vmspace *vm = p->p_vmspace; 506bbb634caSfredette struct vm_map *map; 507ec984a04Sfredette int rv; 508ec984a04Sfredette vm_prot_t ftype; 509821ec03eSchs extern struct vm_map *kernel_map; 510ec984a04Sfredette 511ec984a04Sfredette #ifdef DEBUG 512ec984a04Sfredette if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 513ec984a04Sfredette printf("trap: T_MMUFLT pid=%d, code=0x%x, v=0x%x, pc=0x%x, sr=0x%x\n", 514ec984a04Sfredette p->p_pid, code, v, tf.tf_pc, tf.tf_sr); 515ec984a04Sfredette #endif 516ec984a04Sfredette 517ec984a04Sfredette /* 518ec984a04Sfredette * It is only a kernel address space fault iff: 519ec984a04Sfredette * 1. (type & T_USER) == 0 and: (2 or 3) 520ec984a04Sfredette * 2. pcb_onfault not set or 521ec984a04Sfredette * 3. pcb_onfault set but supervisor space data fault 522ec984a04Sfredette * The last can occur during an exec() copyin where the 523ec984a04Sfredette * argument space is lazy-allocated. 524ec984a04Sfredette */ 525ec984a04Sfredette map = &vm->vm_map; 526ec984a04Sfredette if ((type & T_USER) == 0) { 527ec984a04Sfredette /* supervisor mode fault */ 528d2275d51Sthorpej if ((l->l_addr->u_pcb.pcb_onfault == NULL) || KDFAULT(code)) 529ec984a04Sfredette map = kernel_map; 5303c10927eScl } else if (l->l_flag & L_SA) { 531ea5ec021Scl l->l_savp->savp_faultaddr = (vaddr_t)v; 5323c10927eScl l->l_flag |= L_SA_PAGEFAULT; 533ec984a04Sfredette } 534ec984a04Sfredette 535ec984a04Sfredette if (WRFAULT(code)) 536b744097aSchs ftype = VM_PROT_WRITE; 537ec984a04Sfredette else 538ec984a04Sfredette ftype = VM_PROT_READ; 539bbb634caSfredette va = m68k_trunc_page((vaddr_t)v); 540ec984a04Sfredette 541ec984a04Sfredette /* 542ec984a04Sfredette * Need to resolve the fault. 543ec984a04Sfredette * 544ec984a04Sfredette * We give the pmap code a chance to resolve faults by 545ec984a04Sfredette * reloading translations that it was forced to unload. 546ec984a04Sfredette * This function does that, and calls vm_fault if it 547ec984a04Sfredette * could not resolve the fault by reloading the MMU. 548ec984a04Sfredette * This function may also, for example, disallow any 549ec984a04Sfredette * faults in the kernel text segment, etc. 550ec984a04Sfredette */ 551ec984a04Sfredette rv = _pmap_fault(map, va, ftype); 552ec984a04Sfredette 553ec984a04Sfredette #ifdef DEBUG 554ec984a04Sfredette if (rv && MDB_ISPID(p->p_pid)) { 555ec984a04Sfredette printf("vm_fault(%p, 0x%lx, 0x%x, 0) -> 0x%x\n", 556ec984a04Sfredette map, va, ftype, rv); 557ec984a04Sfredette if (mmudebug & MDB_WBFAILED) 558ec984a04Sfredette Debugger(); 559ec984a04Sfredette } 560ec984a04Sfredette #endif /* DEBUG */ 561ec984a04Sfredette 562ec984a04Sfredette /* 563ec984a04Sfredette * If this was a stack access we keep track of the maximum 564ec984a04Sfredette * accessed stack size. Also, if vm_fault gets a protection 565ec984a04Sfredette * failure it is due to accessing the stack region outside 566ec984a04Sfredette * the current limit and we need to reflect that as an access 567ec984a04Sfredette * error. 568ec984a04Sfredette */ 569ec984a04Sfredette if (rv == 0) { 570*64969161Sjdolecek if (map != kernel_map && (caddr_t)va >= vm->vm_maxsaddr) 571*64969161Sjdolecek uvm_grow(p, va); 572ec984a04Sfredette 5733c10927eScl if ((type & T_USER) != 0) 5743c10927eScl l->l_flag &= ~L_SA_PAGEFAULT; 575ec984a04Sfredette goto finish; 5763c10927eScl } 57741692372Scl if (rv == EACCES) { 57841692372Scl ksi.ksi_code = SEGV_ACCERR; 57941692372Scl rv = EFAULT; 58041692372Scl } else 58141692372Scl ksi.ksi_code = SEGV_MAPERR; 582ec984a04Sfredette if ((type & T_USER) == 0) { 583ec984a04Sfredette /* supervisor mode fault */ 584d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault) { 585ec984a04Sfredette #ifdef DEBUG 586ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 587ec984a04Sfredette printf("trap: copyfault pcb_onfault\n"); 588ec984a04Sfredette Debugger(); 589ec984a04Sfredette } 590ec984a04Sfredette #endif 591ec984a04Sfredette goto copyfault; 592ec984a04Sfredette } 593ec984a04Sfredette printf("vm_fault(%p, 0x%lx, 0x%x, 0) -> 0x%x\n", 594ec984a04Sfredette map, va, ftype, rv); 595ec984a04Sfredette goto dopanic; 596ec984a04Sfredette } 5973c10927eScl l->l_flag &= ~L_SA_PAGEFAULT; 59841692372Scl ksi.ksi_addr = (void *)v; 599ec984a04Sfredette if (rv == ENOMEM) { 600ec984a04Sfredette printf("UVM: pid %d (%s), uid %d killed: out of swap\n", 601ec984a04Sfredette p->p_pid, p->p_comm, 602ec984a04Sfredette p->p_cred && p->p_ucred ? 603ec984a04Sfredette p->p_ucred->cr_uid : -1); 60441692372Scl ksi.ksi_signo = SIGKILL; 605ec984a04Sfredette } else { 60641692372Scl ksi.ksi_signo = SIGSEGV; 607ec984a04Sfredette } 608ec984a04Sfredette break; 609ec984a04Sfredette } /* T_MMUFLT */ 610ec984a04Sfredette } /* switch */ 611ec984a04Sfredette 612ec984a04Sfredette finish: 613ec984a04Sfredette /* If trap was from supervisor mode, just return. */ 614ec984a04Sfredette if ((type & T_USER) == 0) 615ec984a04Sfredette goto done; 616ec984a04Sfredette /* Post a signal if necessary. */ 61741692372Scl if (ksi.ksi_signo) 61841692372Scl trapsignal(l, &ksi); 619ec984a04Sfredette douret: 620d2275d51Sthorpej userret(l, &tf, sticks); 621ec984a04Sfredette 622ec984a04Sfredette done:; 623ec984a04Sfredette /* XXX: Detect trap recursion? */ 624ec984a04Sfredette } 625ec984a04Sfredette 626ec984a04Sfredette /* 627ec984a04Sfredette * This is used if we hit a kernel breakpoint or trace trap 628ec984a04Sfredette * when there is no debugger installed (or not attached). 629ec984a04Sfredette * Drop into the PROM temporarily... 630ec984a04Sfredette */ 631ec984a04Sfredette int 632ec984a04Sfredette _nodb_trap(type, tf) 633ec984a04Sfredette int type; 634ec984a04Sfredette struct trapframe *tf; 635ec984a04Sfredette { 636ec984a04Sfredette 637ec984a04Sfredette printf("\r\nKernel "); 638ec984a04Sfredette if ((0 <= type) && (type < trap_types)) 639ec984a04Sfredette printf("%s", trap_type[type]); 640ec984a04Sfredette else 641ec984a04Sfredette printf("trap 0x%x", type); 642ec984a04Sfredette printf(", frame=%p\r\n", tf); 643ec984a04Sfredette printf("No debugger; doing PROM abort.\r\n"); 644ec984a04Sfredette printf("To continue, type: c <RETURN>\r\n"); 645ec984a04Sfredette prom_abort(); 646ec984a04Sfredette /* OK then, just resume... */ 647ec984a04Sfredette tf->tf_sr &= ~PSL_T; 648ec984a04Sfredette return(1); 649ec984a04Sfredette } 650ec984a04Sfredette 651ec984a04Sfredette /* 652ec984a04Sfredette * This is called by locore for supervisor-mode trace and 653ec984a04Sfredette * breakpoint traps. This is separate from trap() above 654ec984a04Sfredette * so that breakpoints in trap() will work. 655ec984a04Sfredette * 656ec984a04Sfredette * If we have both DDB and KGDB, let KGDB see it first, 657ec984a04Sfredette * because KGDB will just return 0 if not connected. 658ec984a04Sfredette */ 659ec984a04Sfredette void 660ec984a04Sfredette trap_kdebug(type, tf) 661ec984a04Sfredette int type; 662ec984a04Sfredette struct trapframe tf; 663ec984a04Sfredette { 664ec984a04Sfredette 665ec984a04Sfredette #ifdef KGDB 666ec984a04Sfredette /* Let KGDB handle it (if connected) */ 667ec984a04Sfredette if (kgdb_trap(type, &tf)) 668ec984a04Sfredette return; 669ec984a04Sfredette #endif 670ec984a04Sfredette #ifdef DDB 671ec984a04Sfredette /* Let DDB handle it. */ 672ec984a04Sfredette if (kdb_trap(type, &tf)) 673ec984a04Sfredette return; 674ec984a04Sfredette #endif 675ec984a04Sfredette 676ec984a04Sfredette /* Drop into the PROM temporarily... */ 677ec984a04Sfredette (void)_nodb_trap(type, &tf); 678ec984a04Sfredette } 679ec984a04Sfredette 680ec984a04Sfredette /* 681ec984a04Sfredette * Called by locore.s for an unexpected interrupt. 682ec984a04Sfredette * XXX - Almost identical to trap_kdebug... 683ec984a04Sfredette */ 684ec984a04Sfredette void 685ec984a04Sfredette straytrap(tf) 686ec984a04Sfredette struct trapframe tf; 687ec984a04Sfredette { 688ec984a04Sfredette int type = -1; 689ec984a04Sfredette 690ec984a04Sfredette printf("unexpected trap; vector=0x%x at pc=0x%x\n", 691ec984a04Sfredette tf.tf_vector, tf.tf_pc); 692ec984a04Sfredette 693ec984a04Sfredette #ifdef KGDB 694ec984a04Sfredette /* Let KGDB handle it (if connected) */ 695ec984a04Sfredette if (kgdb_trap(type, &tf)) 696ec984a04Sfredette return; 697ec984a04Sfredette #endif 698ec984a04Sfredette #ifdef DDB 699ec984a04Sfredette /* Let DDB handle it. */ 700ec984a04Sfredette if (kdb_trap(type, &tf)) 701ec984a04Sfredette return; 702ec984a04Sfredette #endif 703ec984a04Sfredette 704ec984a04Sfredette /* Drop into the PROM temporarily... */ 705ec984a04Sfredette (void)_nodb_trap(type, &tf); 706ec984a04Sfredette } 707