1*d2275d51Sthorpej /* $NetBSD: trap.c,v 1.8 2003/01/18 06:58:35 thorpej Exp $ */ 2ec984a04Sfredette 3ec984a04Sfredette /* 4ec984a04Sfredette * Copyright (c) 1994 Gordon W. Ross 5ec984a04Sfredette * Copyright (c) 1993 Adam Glass 6ec984a04Sfredette * Copyright (c) 1988 University of Utah. 7ec984a04Sfredette * Copyright (c) 1982, 1986, 1990, 1993 8ec984a04Sfredette * The Regents of the University of California. All rights reserved. 9ec984a04Sfredette * 10ec984a04Sfredette * This code is derived from software contributed to Berkeley by 11ec984a04Sfredette * the Systems Programming Group of the University of Utah Computer 12ec984a04Sfredette * Science Department. 13ec984a04Sfredette * 14ec984a04Sfredette * Redistribution and use in source and binary forms, with or without 15ec984a04Sfredette * modification, are permitted provided that the following conditions 16ec984a04Sfredette * are met: 17ec984a04Sfredette * 1. Redistributions of source code must retain the above copyright 18ec984a04Sfredette * notice, this list of conditions and the following disclaimer. 19ec984a04Sfredette * 2. Redistributions in binary form must reproduce the above copyright 20ec984a04Sfredette * notice, this list of conditions and the following disclaimer in the 21ec984a04Sfredette * documentation and/or other materials provided with the distribution. 22ec984a04Sfredette * 3. All advertising materials mentioning features or use of this software 23ec984a04Sfredette * must display the following acknowledgement: 24ec984a04Sfredette * This product includes software developed by the University of 25ec984a04Sfredette * California, Berkeley and its contributors. 26ec984a04Sfredette * 4. Neither the name of the University nor the names of its contributors 27ec984a04Sfredette * may be used to endorse or promote products derived from this software 28ec984a04Sfredette * without specific prior written permission. 29ec984a04Sfredette * 30ec984a04Sfredette * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31ec984a04Sfredette * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32ec984a04Sfredette * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33ec984a04Sfredette * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34ec984a04Sfredette * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35ec984a04Sfredette * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36ec984a04Sfredette * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37ec984a04Sfredette * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38ec984a04Sfredette * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39ec984a04Sfredette * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40ec984a04Sfredette * SUCH DAMAGE. 41ec984a04Sfredette * 42ec984a04Sfredette * from: Utah Hdr: trap.c 1.37 92/12/20 43ec984a04Sfredette * from: @(#)trap.c 8.5 (Berkeley) 1/4/94 44ec984a04Sfredette */ 45ec984a04Sfredette 46ec984a04Sfredette #include "opt_ddb.h" 47ec984a04Sfredette #include "opt_execfmt.h" 48d84d2c6cSlukem #include "opt_kgdb.h" 49ec984a04Sfredette #include "opt_compat_aout_m68k.h" 50ec984a04Sfredette #include "opt_compat_sunos.h" 51ec984a04Sfredette 52ec984a04Sfredette #include <sys/param.h> 53ec984a04Sfredette #include <sys/systm.h> 54ec984a04Sfredette #include <sys/proc.h> 55ec984a04Sfredette #include <sys/acct.h> 56ec984a04Sfredette #include <sys/kernel.h> 57ec984a04Sfredette #include <sys/signalvar.h> 58ec984a04Sfredette #include <sys/resourcevar.h> 59*d2275d51Sthorpej #include <sys/sa.h> 60*d2275d51Sthorpej #include <sys/savar.h> 61ec984a04Sfredette #include <sys/syscall.h> 62ec984a04Sfredette #include <sys/syslog.h> 63ec984a04Sfredette #include <sys/user.h> 64ec984a04Sfredette #ifdef KGDB 65ec984a04Sfredette #include <sys/kgdb.h> 66ec984a04Sfredette #endif 67ec984a04Sfredette 68ec984a04Sfredette #include <uvm/uvm_extern.h> 69ec984a04Sfredette 70ec984a04Sfredette #include <machine/cpu.h> 71ec984a04Sfredette #include <machine/endian.h> 72ec984a04Sfredette #include <machine/psl.h> 73ec984a04Sfredette #include <machine/trap.h> 74ec984a04Sfredette #include <machine/reg.h> 75ec984a04Sfredette #include <machine/promlib.h> 76ec984a04Sfredette 77ec984a04Sfredette #include <sun2/sun2/fc.h> 78ec984a04Sfredette #include <sun2/sun2/machdep.h> 79ec984a04Sfredette 800dc8ee94Smatt #ifdef DDB 810dc8ee94Smatt #include <machine/db_machdep.h> 820dc8ee94Smatt #include <ddb/db_extern.h> 830dc8ee94Smatt #endif 840dc8ee94Smatt 85ec984a04Sfredette #ifdef COMPAT_SUNOS 86ec984a04Sfredette #include <compat/sunos/sunos_syscall.h> 87ec984a04Sfredette extern struct emul emul_sunos; 88ec984a04Sfredette #endif 89ec984a04Sfredette 90ec984a04Sfredette #ifdef COMPAT_AOUT_M68K 91ec984a04Sfredette extern struct emul emul_netbsd_aoutm68k; 92ec984a04Sfredette #endif 93ec984a04Sfredette 94ec984a04Sfredette /* Special labels in m68k/copy.s */ 95ec984a04Sfredette extern char fubail[], subail[]; 96ec984a04Sfredette 97ec984a04Sfredette /* These are called from locore.s */ 98ec984a04Sfredette void trap __P((int type, u_int code, u_int v, struct trapframe)); 99ec984a04Sfredette void trap_kdebug __P((int type, struct trapframe tf)); 100ec984a04Sfredette int _nodb_trap __P((int type, struct trapframe *)); 101ec984a04Sfredette void straytrap __P((struct trapframe)); 102ec984a04Sfredette 103*d2275d51Sthorpej static void userret __P((struct lwp *, struct trapframe *, u_quad_t)); 104ec984a04Sfredette 105ec984a04Sfredette int astpending; 106ec984a04Sfredette int want_resched; 107ec984a04Sfredette 108ec984a04Sfredette char *trap_type[] = { 109ec984a04Sfredette "Bus error", 110ec984a04Sfredette "Address error", 111ec984a04Sfredette "Illegal instruction", 112ec984a04Sfredette "Zero divide", 113ec984a04Sfredette "CHK instruction", 114ec984a04Sfredette "TRAPV instruction", 115ec984a04Sfredette "Privilege violation", 116ec984a04Sfredette "Trace trap", 117ec984a04Sfredette "MMU fault", 118ec984a04Sfredette "SSIR trap", 119ec984a04Sfredette "Format error", 120ec984a04Sfredette "68881 exception", 121ec984a04Sfredette "Coprocessor violation", 122ec984a04Sfredette "Async system trap", 123ec984a04Sfredette "Unused? (14)", 124ec984a04Sfredette "Breakpoint", 125ec984a04Sfredette "FPU instruction", 126ec984a04Sfredette "FPU data format", 127ec984a04Sfredette }; 128ec984a04Sfredette u_int trap_types = sizeof(trap_type) / sizeof(trap_type[0]); 129ec984a04Sfredette 130ec984a04Sfredette /* 131ec984a04Sfredette * Size of various exception stack frames (minus the standard 8 bytes) 132ec984a04Sfredette */ 133ec984a04Sfredette short exframesize[] = { 134ec984a04Sfredette FMT0SIZE, /* type 0 - normal (68020/030/040/060) */ 135ec984a04Sfredette FMT1SIZE, /* type 1 - throwaway (68020/030/040) */ 136ec984a04Sfredette FMT2SIZE, /* type 2 - normal 6-word (68020/030/040/060) */ 137ec984a04Sfredette FMT3SIZE, /* type 3 - FP post-instruction (68040/060) */ 138ec984a04Sfredette FMT4SIZE, /* type 4 - access error/fp disabled (68060) */ 139ec984a04Sfredette -1, -1, /* type 5-6 - undefined */ 140ec984a04Sfredette FMT7SIZE, /* type 7 - access error (68040) */ 141ec984a04Sfredette FMT8SIZE, /* type 8 - bus fault (68010) */ 142ec984a04Sfredette FMT9SIZE, /* type 9 - coprocessor mid-instruction (68020/030) */ 143ec984a04Sfredette FMTASIZE, /* type A - short bus fault (68020/030) */ 144ec984a04Sfredette FMTBSIZE, /* type B - long bus fault (68020/030) */ 145ec984a04Sfredette -1, -1, -1, -1 /* type C-F - undefined */ 146ec984a04Sfredette }; 147ec984a04Sfredette 148ec984a04Sfredette #define KDFAULT(c) (((c) & (SSW1_IF|SSW1_FCMASK)) == (FC_SUPERD)) 149ec984a04Sfredette #define WRFAULT(c) (((c) & (SSW1_IF|SSW1_DF|SSW1_RW)) == (0)) 150ec984a04Sfredette 151ec984a04Sfredette /* #define DEBUG XXX */ 152ec984a04Sfredette 153ec984a04Sfredette #ifdef DEBUG 1548b21bb00Sfredette unsigned short buserr_reg; 155ec984a04Sfredette int mmudebug = 0; 156ec984a04Sfredette int mmupid = -1; 157ec984a04Sfredette #define MDB_ISPID(p) ((p) == mmupid) 158ec984a04Sfredette #define MDB_FOLLOW 1 159ec984a04Sfredette #define MDB_WBFOLLOW 2 160ec984a04Sfredette #define MDB_WBFAILED 4 161ec984a04Sfredette #define MDB_CPFAULT 8 162ec984a04Sfredette #endif 163ec984a04Sfredette 164ec984a04Sfredette /* 165ec984a04Sfredette * trap and syscall both need the following work done before 166ec984a04Sfredette * returning to user mode. 167ec984a04Sfredette */ 168ec984a04Sfredette static void 169*d2275d51Sthorpej userret(l, tf, oticks) 170*d2275d51Sthorpej struct lwp *l; 171bbb634caSfredette struct trapframe *tf; 172ec984a04Sfredette u_quad_t oticks; 173ec984a04Sfredette { 174*d2275d51Sthorpej struct proc *p = l->l_proc; 175ec984a04Sfredette int sig; 176ec984a04Sfredette 177ec984a04Sfredette /* take pending signals */ 178*d2275d51Sthorpej while ((sig = CURSIG(l)) != 0) 179ec984a04Sfredette postsig(sig); 180ec984a04Sfredette 181*d2275d51Sthorpej /* Invoke per-process kernel-exit handling, if any */ 182*d2275d51Sthorpej if (p->p_userret) 183*d2275d51Sthorpej (p->p_userret)(l, p->p_userret_arg); 184ec984a04Sfredette 185*d2275d51Sthorpej /* Invoke any pending upcalls. */ 186*d2275d51Sthorpej while (l->l_flag & L_SA_UPCALL) 187*d2275d51Sthorpej sa_upcall_userret(l); 188ec984a04Sfredette 189ec984a04Sfredette /* 190ec984a04Sfredette * If profiling, charge system time to the trapped pc. 191ec984a04Sfredette */ 192ec984a04Sfredette if (p->p_flag & P_PROFIL) { 193ec984a04Sfredette extern int psratio; 194ec984a04Sfredette addupc_task(p, tf->tf_pc, 195ec984a04Sfredette (int)(p->p_sticks - oticks) * psratio); 196ec984a04Sfredette } 197ec984a04Sfredette 198*d2275d51Sthorpej curcpu()->ci_schedstate.spc_curpriority = l->l_priority = l->l_usrpri; 199ec984a04Sfredette } 200ec984a04Sfredette 201ec984a04Sfredette /* 202ec984a04Sfredette * Used by the common m68k syscall() and child_return() functions. 203ec984a04Sfredette * XXX: Temporary until all m68k ports share common trap()/userret() code. 204ec984a04Sfredette */ 205*d2275d51Sthorpej void machine_userret(struct lwp *, struct frame *, u_quad_t); 206ec984a04Sfredette 207ec984a04Sfredette void 208*d2275d51Sthorpej machine_userret(l, f, t) 209*d2275d51Sthorpej struct lwp *l; 210ec984a04Sfredette struct frame *f; 211ec984a04Sfredette u_quad_t t; 212ec984a04Sfredette { 213ec984a04Sfredette 214*d2275d51Sthorpej userret(l, &f->F_t, t); 215ec984a04Sfredette } 216ec984a04Sfredette 217ec984a04Sfredette /* 218ec984a04Sfredette * Trap is called from locore to handle most types of processor traps, 219ec984a04Sfredette * including events such as simulated software interrupts/AST's. 220ec984a04Sfredette * System calls are broken out for efficiency. 221ec984a04Sfredette */ 222ec984a04Sfredette /*ARGSUSED*/ 223ec984a04Sfredette void 224ec984a04Sfredette trap(type, code, v, tf) 225ec984a04Sfredette int type; 226ec984a04Sfredette u_int code, v; 227ec984a04Sfredette struct trapframe tf; 228ec984a04Sfredette { 229*d2275d51Sthorpej struct lwp *l; 230bbb634caSfredette struct proc *p; 231bbb634caSfredette int sig, tmp; 232ec984a04Sfredette u_int ucode; 233ec984a04Sfredette u_quad_t sticks; 234ec984a04Sfredette 235ec984a04Sfredette uvmexp.traps++; 236*d2275d51Sthorpej l = curlwp; 237ec984a04Sfredette ucode = 0; 238ec984a04Sfredette sig = 0; 239ec984a04Sfredette 240ec984a04Sfredette /* I have verified that this DOES happen! -gwr */ 241*d2275d51Sthorpej if (l == NULL) 242*d2275d51Sthorpej l = &lwp0; 243*d2275d51Sthorpej p = l->l_proc; 244*d2275d51Sthorpej 245ec984a04Sfredette #ifdef DIAGNOSTIC 246ec984a04Sfredette if (p->p_addr == NULL) 247ec984a04Sfredette panic("trap: no pcb"); 248ec984a04Sfredette #endif 249ec984a04Sfredette 250ec984a04Sfredette if (USERMODE(tf.tf_sr)) { 251ec984a04Sfredette type |= T_USER; 252ec984a04Sfredette sticks = p->p_sticks; 253*d2275d51Sthorpej l->l_md.md_regs = tf.tf_regs; 254ec984a04Sfredette } else { 255ec984a04Sfredette sticks = 0; 256ec984a04Sfredette /* XXX: Detect trap recursion? */ 257ec984a04Sfredette } 258ec984a04Sfredette 259ec984a04Sfredette switch (type) { 260ec984a04Sfredette default: 261ec984a04Sfredette dopanic: 262ec984a04Sfredette printf("trap type=0x%x, code=0x%x, v=0x%x\n", type, code, v); 263ec984a04Sfredette /* 264ec984a04Sfredette * Let the kernel debugger see the trap frame that 265ec984a04Sfredette * caused us to panic. This is a convenience so 266ec984a04Sfredette * one can see registers at the point of failure. 267ec984a04Sfredette */ 268ec984a04Sfredette tmp = splhigh(); 269ec984a04Sfredette #ifdef KGDB 270ec984a04Sfredette /* If connected, step or cont returns 1 */ 271ec984a04Sfredette if (kgdb_trap(type, &tf)) 272ec984a04Sfredette goto kgdb_cont; 273ec984a04Sfredette #endif 274ec984a04Sfredette #ifdef DDB 275ec984a04Sfredette (void) kdb_trap(type, (db_regs_t *) &tf); 276ec984a04Sfredette #endif 277ec984a04Sfredette #ifdef KGDB 278ec984a04Sfredette kgdb_cont: 279ec984a04Sfredette #endif 280ec984a04Sfredette splx(tmp); 281ec984a04Sfredette if (panicstr) { 282ec984a04Sfredette /* 283ec984a04Sfredette * Note: panic is smart enough to do: 284ec984a04Sfredette * boot(RB_AUTOBOOT | RB_NOSYNC, NULL) 285ec984a04Sfredette * if we call it again. 286ec984a04Sfredette */ 287ec984a04Sfredette panic("trap during panic!"); 288ec984a04Sfredette } 289ec984a04Sfredette regdump(&tf, 128); 290ec984a04Sfredette type &= ~T_USER; 291ec984a04Sfredette if ((u_int)type < trap_types) 292ec984a04Sfredette panic(trap_type[type]); 293ec984a04Sfredette panic("trap type 0x%x", type); 294ec984a04Sfredette 295ec984a04Sfredette case T_BUSERR: /* kernel bus error */ 296*d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault == NULL) 297ec984a04Sfredette goto dopanic; 298ec984a04Sfredette /*FALLTHROUGH*/ 299ec984a04Sfredette 300ec984a04Sfredette copyfault: 301ec984a04Sfredette /* 302ec984a04Sfredette * If we have arranged to catch this fault in any of the 303ec984a04Sfredette * copy to/from user space routines, set PC to return to 304ec984a04Sfredette * indicated location and set flag informing buserror code 305ec984a04Sfredette * that it may need to clean up stack frame. 306ec984a04Sfredette */ 307ec984a04Sfredette tf.tf_stackadj = exframesize[tf.tf_format]; 308ec984a04Sfredette tf.tf_format = tf.tf_vector = 0; 309*d2275d51Sthorpej tf.tf_pc = (int) l->l_addr->u_pcb.pcb_onfault; 310ec984a04Sfredette goto done; 311ec984a04Sfredette 312ec984a04Sfredette case T_BUSERR|T_USER: /* bus error */ 313ec984a04Sfredette case T_ADDRERR|T_USER: /* address error */ 314ec984a04Sfredette ucode = v; 315ec984a04Sfredette sig = SIGBUS; 316ec984a04Sfredette break; 317ec984a04Sfredette 318ec984a04Sfredette case T_COPERR: /* kernel coprocessor violation */ 319ec984a04Sfredette case T_FMTERR|T_USER: /* do all RTE errors come in as T_USER? */ 320ec984a04Sfredette case T_FMTERR: /* ...just in case... */ 321ec984a04Sfredette /* 322ec984a04Sfredette * The user has most likely trashed the RTE or FP state info 323ec984a04Sfredette * in the stack frame of a signal handler. 324ec984a04Sfredette */ 325ec984a04Sfredette printf("pid %d: kernel %s exception\n", p->p_pid, 326ec984a04Sfredette type==T_COPERR ? "coprocessor" : "format"); 327ec984a04Sfredette type |= T_USER; 328ec984a04Sfredette SIGACTION(p, SIGILL).sa_handler = SIG_DFL; 329ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigignore, SIGILL); 330ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigcatch, SIGILL); 331ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigmask, SIGILL); 332ec984a04Sfredette sig = SIGILL; 333ec984a04Sfredette ucode = tf.tf_format; 334ec984a04Sfredette break; 335ec984a04Sfredette 336ec984a04Sfredette case T_COPERR|T_USER: /* user coprocessor violation */ 337ec984a04Sfredette /* What is a proper response here? */ 338ec984a04Sfredette ucode = 0; 339ec984a04Sfredette sig = SIGFPE; 340ec984a04Sfredette break; 341ec984a04Sfredette 342ec984a04Sfredette case T_FPERR|T_USER: /* 68881 exceptions */ 343ec984a04Sfredette /* 344ec984a04Sfredette * We pass along the 68881 status register which locore stashed 345ec984a04Sfredette * in code for us. Note that there is a possibility that the 346ec984a04Sfredette * bit pattern of this register will conflict with one of the 347ec984a04Sfredette * FPE_* codes defined in signal.h. Fortunately for us, the 348ec984a04Sfredette * only such codes we use are all in the range 1-7 and the low 349ec984a04Sfredette * 3 bits of the status register are defined as 0 so there is 350ec984a04Sfredette * no clash. 351ec984a04Sfredette */ 352ec984a04Sfredette ucode = code; 353ec984a04Sfredette sig = SIGFPE; 354ec984a04Sfredette break; 355ec984a04Sfredette 356ec984a04Sfredette case T_FPEMULI: /* FPU faults in supervisor mode */ 357ec984a04Sfredette case T_FPEMULD: 358ec984a04Sfredette if (nofault) /* Doing FPU probe? */ 359ec984a04Sfredette longjmp(nofault); 360ec984a04Sfredette goto dopanic; 361ec984a04Sfredette 362ec984a04Sfredette case T_FPEMULI|T_USER: /* unimplemented FP instuction */ 363ec984a04Sfredette case T_FPEMULD|T_USER: /* unimplemented FP data type */ 364ec984a04Sfredette #ifdef FPU_EMULATE 365*d2275d51Sthorpej sig = fpu_emulate(&tf, &l->l_addr->u_pcb.pcb_fpregs); 366ec984a04Sfredette /* XXX - Deal with tracing? (tf.tf_sr & PSL_T) */ 367ec984a04Sfredette #else 368ec984a04Sfredette uprintf("pid %d killed: no floating point support\n", p->p_pid); 369ec984a04Sfredette sig = SIGILL; 370ec984a04Sfredette #endif 371ec984a04Sfredette break; 372ec984a04Sfredette 373ec984a04Sfredette case T_ILLINST|T_USER: /* illegal instruction fault */ 374ec984a04Sfredette case T_PRIVINST|T_USER: /* privileged instruction fault */ 375ec984a04Sfredette ucode = tf.tf_format; 376ec984a04Sfredette sig = SIGILL; 377ec984a04Sfredette break; 378ec984a04Sfredette 379ec984a04Sfredette case T_ZERODIV|T_USER: /* Divide by zero */ 380ec984a04Sfredette case T_CHKINST|T_USER: /* CHK instruction trap */ 381ec984a04Sfredette case T_TRAPVINST|T_USER: /* TRAPV instruction trap */ 382ec984a04Sfredette ucode = tf.tf_format; 383ec984a04Sfredette sig = SIGFPE; 384ec984a04Sfredette break; 385ec984a04Sfredette 386ec984a04Sfredette /* 387ec984a04Sfredette * XXX: Trace traps are a nightmare. 388ec984a04Sfredette * 389ec984a04Sfredette * HP-UX uses trap #1 for breakpoints, 390ec984a04Sfredette * NetBSD/m68k uses trap #2, 391ec984a04Sfredette * SUN 3.x uses trap #15, 392ec984a04Sfredette * DDB and KGDB uses trap #15 (for kernel breakpoints; 393ec984a04Sfredette * handled elsewhere). 394ec984a04Sfredette * 395ec984a04Sfredette * NetBSD and HP-UX traps both get mapped by locore.s into T_TRACE. 396ec984a04Sfredette * SUN 3.x traps get passed through as T_TRAP15 and are not really 397ec984a04Sfredette * supported yet. 398ec984a04Sfredette * 399ec984a04Sfredette * XXX: We should never get kernel-mode T_TRAP15 400ec984a04Sfredette * XXX: because locore.s now gives them special treatment. 401ec984a04Sfredette */ 402ec984a04Sfredette case T_TRAP15: /* kernel breakpoint */ 403ec984a04Sfredette tf.tf_sr &= ~PSL_T; 404ec984a04Sfredette goto done; 405ec984a04Sfredette 406ec984a04Sfredette case T_TRACE|T_USER: /* user trace trap */ 407ec984a04Sfredette #ifdef COMPAT_SUNOS 408ec984a04Sfredette /* 409ec984a04Sfredette * SunOS uses Trap #2 for a "CPU cache flush" 410ec984a04Sfredette * Just flush the on-chip caches and return. 411ec984a04Sfredette * XXX - Too bad NetBSD uses trap 2... 412ec984a04Sfredette */ 413ec984a04Sfredette if (p->p_emul == &emul_sunos) { 414ec984a04Sfredette /* get out fast */ 415ec984a04Sfredette goto done; 416ec984a04Sfredette } 417ec984a04Sfredette #endif 418ec984a04Sfredette /* FALLTHROUGH */ 419ec984a04Sfredette case T_TRACE: /* tracing a trap instruction */ 420ec984a04Sfredette case T_TRAP15|T_USER: /* SUN user trace trap */ 421ec984a04Sfredette tf.tf_sr &= ~PSL_T; 422ec984a04Sfredette sig = SIGTRAP; 423ec984a04Sfredette break; 424ec984a04Sfredette 425ec984a04Sfredette case T_ASTFLT: /* system async trap, cannot happen */ 426ec984a04Sfredette goto dopanic; 427ec984a04Sfredette 428ec984a04Sfredette case T_ASTFLT|T_USER: /* user async trap */ 429ec984a04Sfredette astpending = 0; 430ec984a04Sfredette /* T_SSIR is not used on a Sun2. */ 431ec984a04Sfredette if (p->p_flag & P_OWEUPC) { 432ec984a04Sfredette p->p_flag &= ~P_OWEUPC; 433ec984a04Sfredette ADDUPROF(p); 434ec984a04Sfredette } 435*d2275d51Sthorpej if (want_resched) 436*d2275d51Sthorpej preempt(0); 437ec984a04Sfredette goto douret; 438ec984a04Sfredette 439ec984a04Sfredette case T_MMUFLT: /* kernel mode page fault */ 440ec984a04Sfredette /* Hacks to avoid calling VM code from debugger. */ 441ec984a04Sfredette #ifdef DDB 442ec984a04Sfredette if (db_recover != 0) 443ec984a04Sfredette goto dopanic; 444ec984a04Sfredette #endif 445ec984a04Sfredette #ifdef KGDB 446ec984a04Sfredette if (kgdb_recover != 0) 447ec984a04Sfredette goto dopanic; 448ec984a04Sfredette #endif 449ec984a04Sfredette /* 450ec984a04Sfredette * If we were doing profiling ticks or other user mode 451ec984a04Sfredette * stuff from interrupt code, Just Say No. 452ec984a04Sfredette */ 453*d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault == (caddr_t)fubail || 454*d2275d51Sthorpej l->l_addr->u_pcb.pcb_onfault == (caddr_t)subail) 455ec984a04Sfredette { 456ec984a04Sfredette #ifdef DEBUG 457ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 458ec984a04Sfredette printf("trap: copyfault fu/su bail\n"); 459ec984a04Sfredette Debugger(); 460ec984a04Sfredette } 461ec984a04Sfredette #endif 462ec984a04Sfredette goto copyfault; 463ec984a04Sfredette } 464ec984a04Sfredette /*FALLTHROUGH*/ 465ec984a04Sfredette 466ec984a04Sfredette case T_MMUFLT|T_USER: { /* page fault */ 467bbb634caSfredette vaddr_t va; 468bbb634caSfredette struct vmspace *vm = p->p_vmspace; 469bbb634caSfredette struct vm_map *map; 470ec984a04Sfredette int rv; 471ec984a04Sfredette vm_prot_t ftype; 472821ec03eSchs extern struct vm_map *kernel_map; 473ec984a04Sfredette 474ec984a04Sfredette #ifdef DEBUG 475ec984a04Sfredette if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 476ec984a04Sfredette printf("trap: T_MMUFLT pid=%d, code=0x%x, v=0x%x, pc=0x%x, sr=0x%x\n", 477ec984a04Sfredette p->p_pid, code, v, tf.tf_pc, tf.tf_sr); 478ec984a04Sfredette #endif 479ec984a04Sfredette 480ec984a04Sfredette /* 481ec984a04Sfredette * It is only a kernel address space fault iff: 482ec984a04Sfredette * 1. (type & T_USER) == 0 and: (2 or 3) 483ec984a04Sfredette * 2. pcb_onfault not set or 484ec984a04Sfredette * 3. pcb_onfault set but supervisor space data fault 485ec984a04Sfredette * The last can occur during an exec() copyin where the 486ec984a04Sfredette * argument space is lazy-allocated. 487ec984a04Sfredette */ 488ec984a04Sfredette map = &vm->vm_map; 489ec984a04Sfredette if ((type & T_USER) == 0) { 490ec984a04Sfredette /* supervisor mode fault */ 491*d2275d51Sthorpej if ((l->l_addr->u_pcb.pcb_onfault == NULL) || KDFAULT(code)) 492ec984a04Sfredette map = kernel_map; 493ec984a04Sfredette } 494ec984a04Sfredette 495ec984a04Sfredette if (WRFAULT(code)) 496b744097aSchs ftype = VM_PROT_WRITE; 497ec984a04Sfredette else 498ec984a04Sfredette ftype = VM_PROT_READ; 499bbb634caSfredette va = m68k_trunc_page((vaddr_t)v); 500ec984a04Sfredette 501ec984a04Sfredette /* 502ec984a04Sfredette * Need to resolve the fault. 503ec984a04Sfredette * 504ec984a04Sfredette * We give the pmap code a chance to resolve faults by 505ec984a04Sfredette * reloading translations that it was forced to unload. 506ec984a04Sfredette * This function does that, and calls vm_fault if it 507ec984a04Sfredette * could not resolve the fault by reloading the MMU. 508ec984a04Sfredette * This function may also, for example, disallow any 509ec984a04Sfredette * faults in the kernel text segment, etc. 510ec984a04Sfredette */ 511ec984a04Sfredette rv = _pmap_fault(map, va, ftype); 512ec984a04Sfredette 513ec984a04Sfredette #ifdef DEBUG 514ec984a04Sfredette if (rv && MDB_ISPID(p->p_pid)) { 515ec984a04Sfredette printf("vm_fault(%p, 0x%lx, 0x%x, 0) -> 0x%x\n", 516ec984a04Sfredette map, va, ftype, rv); 517ec984a04Sfredette if (mmudebug & MDB_WBFAILED) 518ec984a04Sfredette Debugger(); 519ec984a04Sfredette } 520ec984a04Sfredette #endif /* DEBUG */ 521ec984a04Sfredette 522ec984a04Sfredette /* 523ec984a04Sfredette * If this was a stack access we keep track of the maximum 524ec984a04Sfredette * accessed stack size. Also, if vm_fault gets a protection 525ec984a04Sfredette * failure it is due to accessing the stack region outside 526ec984a04Sfredette * the current limit and we need to reflect that as an access 527ec984a04Sfredette * error. 528ec984a04Sfredette */ 529ec984a04Sfredette if ((map != kernel_map) && ((caddr_t)va >= vm->vm_maxsaddr)) { 530ec984a04Sfredette if (rv == 0) { 531ec984a04Sfredette unsigned nss; 532ec984a04Sfredette 533ec984a04Sfredette nss = btoc((u_int)(USRSTACK-va)); 534ec984a04Sfredette if (nss > vm->vm_ssize) 535ec984a04Sfredette vm->vm_ssize = nss; 536ec984a04Sfredette } else if (rv == EACCES) 537ec984a04Sfredette rv = EFAULT; 538ec984a04Sfredette } 539ec984a04Sfredette if (rv == 0) 540ec984a04Sfredette goto finish; 541ec984a04Sfredette 542ec984a04Sfredette if ((type & T_USER) == 0) { 543ec984a04Sfredette /* supervisor mode fault */ 544*d2275d51Sthorpej if (l->l_addr->u_pcb.pcb_onfault) { 545ec984a04Sfredette #ifdef DEBUG 546ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 547ec984a04Sfredette printf("trap: copyfault pcb_onfault\n"); 548ec984a04Sfredette Debugger(); 549ec984a04Sfredette } 550ec984a04Sfredette #endif 551ec984a04Sfredette goto copyfault; 552ec984a04Sfredette } 553ec984a04Sfredette printf("vm_fault(%p, 0x%lx, 0x%x, 0) -> 0x%x\n", 554ec984a04Sfredette map, va, ftype, rv); 555ec984a04Sfredette goto dopanic; 556ec984a04Sfredette } 557ec984a04Sfredette ucode = v; 558ec984a04Sfredette if (rv == ENOMEM) { 559ec984a04Sfredette printf("UVM: pid %d (%s), uid %d killed: out of swap\n", 560ec984a04Sfredette p->p_pid, p->p_comm, 561ec984a04Sfredette p->p_cred && p->p_ucred ? 562ec984a04Sfredette p->p_ucred->cr_uid : -1); 563ec984a04Sfredette sig = SIGKILL; 564ec984a04Sfredette } else { 565ec984a04Sfredette sig = SIGSEGV; 566ec984a04Sfredette } 567ec984a04Sfredette break; 568ec984a04Sfredette } /* T_MMUFLT */ 569ec984a04Sfredette } /* switch */ 570ec984a04Sfredette 571ec984a04Sfredette finish: 572ec984a04Sfredette /* If trap was from supervisor mode, just return. */ 573ec984a04Sfredette if ((type & T_USER) == 0) 574ec984a04Sfredette goto done; 575ec984a04Sfredette /* Post a signal if necessary. */ 576ec984a04Sfredette if (sig != 0) 577*d2275d51Sthorpej trapsignal(l, sig, ucode); 578ec984a04Sfredette douret: 579*d2275d51Sthorpej userret(l, &tf, sticks); 580ec984a04Sfredette 581ec984a04Sfredette done:; 582ec984a04Sfredette /* XXX: Detect trap recursion? */ 583ec984a04Sfredette } 584ec984a04Sfredette 585ec984a04Sfredette /* 586ec984a04Sfredette * This is used if we hit a kernel breakpoint or trace trap 587ec984a04Sfredette * when there is no debugger installed (or not attached). 588ec984a04Sfredette * Drop into the PROM temporarily... 589ec984a04Sfredette */ 590ec984a04Sfredette int 591ec984a04Sfredette _nodb_trap(type, tf) 592ec984a04Sfredette int type; 593ec984a04Sfredette struct trapframe *tf; 594ec984a04Sfredette { 595ec984a04Sfredette 596ec984a04Sfredette printf("\r\nKernel "); 597ec984a04Sfredette if ((0 <= type) && (type < trap_types)) 598ec984a04Sfredette printf("%s", trap_type[type]); 599ec984a04Sfredette else 600ec984a04Sfredette printf("trap 0x%x", type); 601ec984a04Sfredette printf(", frame=%p\r\n", tf); 602ec984a04Sfredette printf("No debugger; doing PROM abort.\r\n"); 603ec984a04Sfredette printf("To continue, type: c <RETURN>\r\n"); 604ec984a04Sfredette prom_abort(); 605ec984a04Sfredette /* OK then, just resume... */ 606ec984a04Sfredette tf->tf_sr &= ~PSL_T; 607ec984a04Sfredette return(1); 608ec984a04Sfredette } 609ec984a04Sfredette 610ec984a04Sfredette /* 611ec984a04Sfredette * This is called by locore for supervisor-mode trace and 612ec984a04Sfredette * breakpoint traps. This is separate from trap() above 613ec984a04Sfredette * so that breakpoints in trap() will work. 614ec984a04Sfredette * 615ec984a04Sfredette * If we have both DDB and KGDB, let KGDB see it first, 616ec984a04Sfredette * because KGDB will just return 0 if not connected. 617ec984a04Sfredette */ 618ec984a04Sfredette void 619ec984a04Sfredette trap_kdebug(type, tf) 620ec984a04Sfredette int type; 621ec984a04Sfredette struct trapframe tf; 622ec984a04Sfredette { 623ec984a04Sfredette 624ec984a04Sfredette #ifdef KGDB 625ec984a04Sfredette /* Let KGDB handle it (if connected) */ 626ec984a04Sfredette if (kgdb_trap(type, &tf)) 627ec984a04Sfredette return; 628ec984a04Sfredette #endif 629ec984a04Sfredette #ifdef DDB 630ec984a04Sfredette /* Let DDB handle it. */ 631ec984a04Sfredette if (kdb_trap(type, &tf)) 632ec984a04Sfredette return; 633ec984a04Sfredette #endif 634ec984a04Sfredette 635ec984a04Sfredette /* Drop into the PROM temporarily... */ 636ec984a04Sfredette (void)_nodb_trap(type, &tf); 637ec984a04Sfredette } 638ec984a04Sfredette 639ec984a04Sfredette /* 640ec984a04Sfredette * Called by locore.s for an unexpected interrupt. 641ec984a04Sfredette * XXX - Almost identical to trap_kdebug... 642ec984a04Sfredette */ 643ec984a04Sfredette void 644ec984a04Sfredette straytrap(tf) 645ec984a04Sfredette struct trapframe tf; 646ec984a04Sfredette { 647ec984a04Sfredette int type = -1; 648ec984a04Sfredette 649ec984a04Sfredette printf("unexpected trap; vector=0x%x at pc=0x%x\n", 650ec984a04Sfredette tf.tf_vector, tf.tf_pc); 651ec984a04Sfredette 652ec984a04Sfredette #ifdef KGDB 653ec984a04Sfredette /* Let KGDB handle it (if connected) */ 654ec984a04Sfredette if (kgdb_trap(type, &tf)) 655ec984a04Sfredette return; 656ec984a04Sfredette #endif 657ec984a04Sfredette #ifdef DDB 658ec984a04Sfredette /* Let DDB handle it. */ 659ec984a04Sfredette if (kdb_trap(type, &tf)) 660ec984a04Sfredette return; 661ec984a04Sfredette #endif 662ec984a04Sfredette 663ec984a04Sfredette /* Drop into the PROM temporarily... */ 664ec984a04Sfredette (void)_nodb_trap(type, &tf); 665ec984a04Sfredette } 666