1*821ec03eSchs /* $NetBSD: trap.c,v 1.3 2001/06/02 18:09:22 chs 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> 59ec984a04Sfredette #include <sys/syscall.h> 60ec984a04Sfredette #include <sys/syslog.h> 61ec984a04Sfredette #include <sys/user.h> 62ec984a04Sfredette #ifdef KGDB 63ec984a04Sfredette #include <sys/kgdb.h> 64ec984a04Sfredette #endif 65ec984a04Sfredette 66ec984a04Sfredette #include <uvm/uvm_extern.h> 67ec984a04Sfredette 68ec984a04Sfredette #include <machine/cpu.h> 69ec984a04Sfredette #include <machine/db_machdep.h> 70ec984a04Sfredette #include <machine/endian.h> 71ec984a04Sfredette #include <machine/psl.h> 72ec984a04Sfredette #include <machine/trap.h> 73ec984a04Sfredette #include <machine/reg.h> 74ec984a04Sfredette #include <machine/promlib.h> 75ec984a04Sfredette 76ec984a04Sfredette #include <sun2/sun2/fc.h> 77ec984a04Sfredette #include <sun2/sun2/machdep.h> 78ec984a04Sfredette 79ec984a04Sfredette #ifdef COMPAT_SUNOS 80ec984a04Sfredette #include <compat/sunos/sunos_syscall.h> 81ec984a04Sfredette extern struct emul emul_sunos; 82ec984a04Sfredette #endif 83ec984a04Sfredette 84ec984a04Sfredette #ifdef COMPAT_AOUT_M68K 85ec984a04Sfredette extern struct emul emul_netbsd_aoutm68k; 86ec984a04Sfredette #endif 87ec984a04Sfredette 88ec984a04Sfredette /* Special labels in m68k/copy.s */ 89ec984a04Sfredette extern char fubail[], subail[]; 90ec984a04Sfredette 91ec984a04Sfredette /* These are called from locore.s */ 92ec984a04Sfredette void trap __P((int type, u_int code, u_int v, struct trapframe)); 93ec984a04Sfredette void trap_kdebug __P((int type, struct trapframe tf)); 94ec984a04Sfredette int _nodb_trap __P((int type, struct trapframe *)); 95ec984a04Sfredette void straytrap __P((struct trapframe)); 96ec984a04Sfredette 97ec984a04Sfredette static void userret __P((struct proc *, struct trapframe *, u_quad_t)); 98ec984a04Sfredette 99ec984a04Sfredette int astpending; 100ec984a04Sfredette int want_resched; 101ec984a04Sfredette 102ec984a04Sfredette char *trap_type[] = { 103ec984a04Sfredette "Bus error", 104ec984a04Sfredette "Address error", 105ec984a04Sfredette "Illegal instruction", 106ec984a04Sfredette "Zero divide", 107ec984a04Sfredette "CHK instruction", 108ec984a04Sfredette "TRAPV instruction", 109ec984a04Sfredette "Privilege violation", 110ec984a04Sfredette "Trace trap", 111ec984a04Sfredette "MMU fault", 112ec984a04Sfredette "SSIR trap", 113ec984a04Sfredette "Format error", 114ec984a04Sfredette "68881 exception", 115ec984a04Sfredette "Coprocessor violation", 116ec984a04Sfredette "Async system trap", 117ec984a04Sfredette "Unused? (14)", 118ec984a04Sfredette "Breakpoint", 119ec984a04Sfredette "FPU instruction", 120ec984a04Sfredette "FPU data format", 121ec984a04Sfredette }; 122ec984a04Sfredette u_int trap_types = sizeof(trap_type) / sizeof(trap_type[0]); 123ec984a04Sfredette 124ec984a04Sfredette /* 125ec984a04Sfredette * Size of various exception stack frames (minus the standard 8 bytes) 126ec984a04Sfredette */ 127ec984a04Sfredette short exframesize[] = { 128ec984a04Sfredette FMT0SIZE, /* type 0 - normal (68020/030/040/060) */ 129ec984a04Sfredette FMT1SIZE, /* type 1 - throwaway (68020/030/040) */ 130ec984a04Sfredette FMT2SIZE, /* type 2 - normal 6-word (68020/030/040/060) */ 131ec984a04Sfredette FMT3SIZE, /* type 3 - FP post-instruction (68040/060) */ 132ec984a04Sfredette FMT4SIZE, /* type 4 - access error/fp disabled (68060) */ 133ec984a04Sfredette -1, -1, /* type 5-6 - undefined */ 134ec984a04Sfredette FMT7SIZE, /* type 7 - access error (68040) */ 135ec984a04Sfredette FMT8SIZE, /* type 8 - bus fault (68010) */ 136ec984a04Sfredette FMT9SIZE, /* type 9 - coprocessor mid-instruction (68020/030) */ 137ec984a04Sfredette FMTASIZE, /* type A - short bus fault (68020/030) */ 138ec984a04Sfredette FMTBSIZE, /* type B - long bus fault (68020/030) */ 139ec984a04Sfredette -1, -1, -1, -1 /* type C-F - undefined */ 140ec984a04Sfredette }; 141ec984a04Sfredette 142ec984a04Sfredette #define KDFAULT(c) (((c) & (SSW1_IF|SSW1_FCMASK)) == (FC_SUPERD)) 143ec984a04Sfredette #define WRFAULT(c) (((c) & (SSW1_IF|SSW1_DF|SSW1_RW)) == (0)) 144ec984a04Sfredette 145ec984a04Sfredette /* #define DEBUG XXX */ 146ec984a04Sfredette 147ec984a04Sfredette #ifdef DEBUG 148ec984a04Sfredette int mmudebug = 0; 149ec984a04Sfredette int mmupid = -1; 150ec984a04Sfredette #define MDB_ISPID(p) ((p) == mmupid) 151ec984a04Sfredette #define MDB_FOLLOW 1 152ec984a04Sfredette #define MDB_WBFOLLOW 2 153ec984a04Sfredette #define MDB_WBFAILED 4 154ec984a04Sfredette #define MDB_CPFAULT 8 155ec984a04Sfredette #endif 156ec984a04Sfredette 157ec984a04Sfredette /* 158ec984a04Sfredette * trap and syscall both need the following work done before 159ec984a04Sfredette * returning to user mode. 160ec984a04Sfredette */ 161ec984a04Sfredette static void 162ec984a04Sfredette userret(p, tf, oticks) 163ec984a04Sfredette register struct proc *p; 164ec984a04Sfredette register struct trapframe *tf; 165ec984a04Sfredette u_quad_t oticks; 166ec984a04Sfredette { 167ec984a04Sfredette int sig; 168ec984a04Sfredette 169ec984a04Sfredette /* take pending signals */ 170ec984a04Sfredette while ((sig = CURSIG(p)) != 0) 171ec984a04Sfredette postsig(sig); 172ec984a04Sfredette 173ec984a04Sfredette p->p_priority = p->p_usrpri; 174ec984a04Sfredette 175ec984a04Sfredette if (want_resched) { 176ec984a04Sfredette /* 177ec984a04Sfredette * We are being preempted. 178ec984a04Sfredette */ 179ec984a04Sfredette preempt(NULL); 180ec984a04Sfredette while ((sig = CURSIG(p)) != 0) 181ec984a04Sfredette postsig(sig); 182ec984a04Sfredette } 183ec984a04Sfredette 184ec984a04Sfredette /* 185ec984a04Sfredette * If profiling, charge system time to the trapped pc. 186ec984a04Sfredette */ 187ec984a04Sfredette if (p->p_flag & P_PROFIL) { 188ec984a04Sfredette extern int psratio; 189ec984a04Sfredette addupc_task(p, tf->tf_pc, 190ec984a04Sfredette (int)(p->p_sticks - oticks) * psratio); 191ec984a04Sfredette } 192ec984a04Sfredette 193ec984a04Sfredette curcpu()->ci_schedstate.spc_curpriority = p->p_priority; 194ec984a04Sfredette } 195ec984a04Sfredette 196ec984a04Sfredette /* 197ec984a04Sfredette * Used by the common m68k syscall() and child_return() functions. 198ec984a04Sfredette * XXX: Temporary until all m68k ports share common trap()/userret() code. 199ec984a04Sfredette */ 200ec984a04Sfredette void machine_userret(struct proc *, struct frame *, u_quad_t); 201ec984a04Sfredette 202ec984a04Sfredette void 203ec984a04Sfredette machine_userret(p, f, t) 204ec984a04Sfredette struct proc *p; 205ec984a04Sfredette struct frame *f; 206ec984a04Sfredette u_quad_t t; 207ec984a04Sfredette { 208ec984a04Sfredette 209ec984a04Sfredette userret(p, &f->F_t, t); 210ec984a04Sfredette } 211ec984a04Sfredette 212ec984a04Sfredette /* 213ec984a04Sfredette * Trap is called from locore to handle most types of processor traps, 214ec984a04Sfredette * including events such as simulated software interrupts/AST's. 215ec984a04Sfredette * System calls are broken out for efficiency. 216ec984a04Sfredette */ 217ec984a04Sfredette /*ARGSUSED*/ 218ec984a04Sfredette void 219ec984a04Sfredette trap(type, code, v, tf) 220ec984a04Sfredette int type; 221ec984a04Sfredette u_int code, v; 222ec984a04Sfredette struct trapframe tf; 223ec984a04Sfredette { 224ec984a04Sfredette register struct proc *p; 225ec984a04Sfredette register int sig, tmp; 226ec984a04Sfredette u_int ucode; 227ec984a04Sfredette u_quad_t sticks; 228ec984a04Sfredette 229ec984a04Sfredette uvmexp.traps++; 230ec984a04Sfredette p = curproc; 231ec984a04Sfredette ucode = 0; 232ec984a04Sfredette sig = 0; 233ec984a04Sfredette 234ec984a04Sfredette /* I have verified that this DOES happen! -gwr */ 235ec984a04Sfredette if (p == NULL) 236ec984a04Sfredette p = &proc0; 237ec984a04Sfredette #ifdef DIAGNOSTIC 238ec984a04Sfredette if (p->p_addr == NULL) 239ec984a04Sfredette panic("trap: no pcb"); 240ec984a04Sfredette #endif 241ec984a04Sfredette 242ec984a04Sfredette if (USERMODE(tf.tf_sr)) { 243ec984a04Sfredette type |= T_USER; 244ec984a04Sfredette sticks = p->p_sticks; 245ec984a04Sfredette p->p_md.md_regs = tf.tf_regs; 246ec984a04Sfredette } else { 247ec984a04Sfredette sticks = 0; 248ec984a04Sfredette /* XXX: Detect trap recursion? */ 249ec984a04Sfredette } 250ec984a04Sfredette 251ec984a04Sfredette switch (type) { 252ec984a04Sfredette default: 253ec984a04Sfredette dopanic: 254ec984a04Sfredette printf("trap type=0x%x, code=0x%x, v=0x%x\n", type, code, v); 255ec984a04Sfredette /* 256ec984a04Sfredette * Let the kernel debugger see the trap frame that 257ec984a04Sfredette * caused us to panic. This is a convenience so 258ec984a04Sfredette * one can see registers at the point of failure. 259ec984a04Sfredette */ 260ec984a04Sfredette tmp = splhigh(); 261ec984a04Sfredette #ifdef KGDB 262ec984a04Sfredette /* If connected, step or cont returns 1 */ 263ec984a04Sfredette if (kgdb_trap(type, &tf)) 264ec984a04Sfredette goto kgdb_cont; 265ec984a04Sfredette #endif 266ec984a04Sfredette #ifdef DDB 267ec984a04Sfredette (void) kdb_trap(type, (db_regs_t *) &tf); 268ec984a04Sfredette #endif 269ec984a04Sfredette #ifdef KGDB 270ec984a04Sfredette kgdb_cont: 271ec984a04Sfredette #endif 272ec984a04Sfredette splx(tmp); 273ec984a04Sfredette if (panicstr) { 274ec984a04Sfredette /* 275ec984a04Sfredette * Note: panic is smart enough to do: 276ec984a04Sfredette * boot(RB_AUTOBOOT | RB_NOSYNC, NULL) 277ec984a04Sfredette * if we call it again. 278ec984a04Sfredette */ 279ec984a04Sfredette panic("trap during panic!"); 280ec984a04Sfredette } 281ec984a04Sfredette regdump(&tf, 128); 282ec984a04Sfredette type &= ~T_USER; 283ec984a04Sfredette if ((u_int)type < trap_types) 284ec984a04Sfredette panic(trap_type[type]); 285ec984a04Sfredette panic("trap type 0x%x", type); 286ec984a04Sfredette 287ec984a04Sfredette case T_BUSERR: /* kernel bus error */ 288ec984a04Sfredette if (p->p_addr->u_pcb.pcb_onfault == NULL) 289ec984a04Sfredette goto dopanic; 290ec984a04Sfredette /*FALLTHROUGH*/ 291ec984a04Sfredette 292ec984a04Sfredette copyfault: 293ec984a04Sfredette /* 294ec984a04Sfredette * If we have arranged to catch this fault in any of the 295ec984a04Sfredette * copy to/from user space routines, set PC to return to 296ec984a04Sfredette * indicated location and set flag informing buserror code 297ec984a04Sfredette * that it may need to clean up stack frame. 298ec984a04Sfredette */ 299ec984a04Sfredette tf.tf_stackadj = exframesize[tf.tf_format]; 300ec984a04Sfredette tf.tf_format = tf.tf_vector = 0; 301ec984a04Sfredette tf.tf_pc = (int) p->p_addr->u_pcb.pcb_onfault; 302ec984a04Sfredette goto done; 303ec984a04Sfredette 304ec984a04Sfredette case T_BUSERR|T_USER: /* bus error */ 305ec984a04Sfredette case T_ADDRERR|T_USER: /* address error */ 306ec984a04Sfredette ucode = v; 307ec984a04Sfredette sig = SIGBUS; 308ec984a04Sfredette break; 309ec984a04Sfredette 310ec984a04Sfredette case T_COPERR: /* kernel coprocessor violation */ 311ec984a04Sfredette case T_FMTERR|T_USER: /* do all RTE errors come in as T_USER? */ 312ec984a04Sfredette case T_FMTERR: /* ...just in case... */ 313ec984a04Sfredette /* 314ec984a04Sfredette * The user has most likely trashed the RTE or FP state info 315ec984a04Sfredette * in the stack frame of a signal handler. 316ec984a04Sfredette */ 317ec984a04Sfredette printf("pid %d: kernel %s exception\n", p->p_pid, 318ec984a04Sfredette type==T_COPERR ? "coprocessor" : "format"); 319ec984a04Sfredette type |= T_USER; 320ec984a04Sfredette SIGACTION(p, SIGILL).sa_handler = SIG_DFL; 321ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigignore, SIGILL); 322ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigcatch, SIGILL); 323ec984a04Sfredette sigdelset(&p->p_sigctx.ps_sigmask, SIGILL); 324ec984a04Sfredette sig = SIGILL; 325ec984a04Sfredette ucode = tf.tf_format; 326ec984a04Sfredette break; 327ec984a04Sfredette 328ec984a04Sfredette case T_COPERR|T_USER: /* user coprocessor violation */ 329ec984a04Sfredette /* What is a proper response here? */ 330ec984a04Sfredette ucode = 0; 331ec984a04Sfredette sig = SIGFPE; 332ec984a04Sfredette break; 333ec984a04Sfredette 334ec984a04Sfredette case T_FPERR|T_USER: /* 68881 exceptions */ 335ec984a04Sfredette /* 336ec984a04Sfredette * We pass along the 68881 status register which locore stashed 337ec984a04Sfredette * in code for us. Note that there is a possibility that the 338ec984a04Sfredette * bit pattern of this register will conflict with one of the 339ec984a04Sfredette * FPE_* codes defined in signal.h. Fortunately for us, the 340ec984a04Sfredette * only such codes we use are all in the range 1-7 and the low 341ec984a04Sfredette * 3 bits of the status register are defined as 0 so there is 342ec984a04Sfredette * no clash. 343ec984a04Sfredette */ 344ec984a04Sfredette ucode = code; 345ec984a04Sfredette sig = SIGFPE; 346ec984a04Sfredette break; 347ec984a04Sfredette 348ec984a04Sfredette case T_FPEMULI: /* FPU faults in supervisor mode */ 349ec984a04Sfredette case T_FPEMULD: 350ec984a04Sfredette if (nofault) /* Doing FPU probe? */ 351ec984a04Sfredette longjmp(nofault); 352ec984a04Sfredette goto dopanic; 353ec984a04Sfredette 354ec984a04Sfredette case T_FPEMULI|T_USER: /* unimplemented FP instuction */ 355ec984a04Sfredette case T_FPEMULD|T_USER: /* unimplemented FP data type */ 356ec984a04Sfredette #ifdef FPU_EMULATE 357ec984a04Sfredette sig = fpu_emulate(&tf, &p->p_addr->u_pcb.pcb_fpregs); 358ec984a04Sfredette /* XXX - Deal with tracing? (tf.tf_sr & PSL_T) */ 359ec984a04Sfredette #else 360ec984a04Sfredette uprintf("pid %d killed: no floating point support\n", p->p_pid); 361ec984a04Sfredette sig = SIGILL; 362ec984a04Sfredette #endif 363ec984a04Sfredette break; 364ec984a04Sfredette 365ec984a04Sfredette case T_ILLINST|T_USER: /* illegal instruction fault */ 366ec984a04Sfredette case T_PRIVINST|T_USER: /* privileged instruction fault */ 367ec984a04Sfredette ucode = tf.tf_format; 368ec984a04Sfredette sig = SIGILL; 369ec984a04Sfredette break; 370ec984a04Sfredette 371ec984a04Sfredette case T_ZERODIV|T_USER: /* Divide by zero */ 372ec984a04Sfredette case T_CHKINST|T_USER: /* CHK instruction trap */ 373ec984a04Sfredette case T_TRAPVINST|T_USER: /* TRAPV instruction trap */ 374ec984a04Sfredette ucode = tf.tf_format; 375ec984a04Sfredette sig = SIGFPE; 376ec984a04Sfredette break; 377ec984a04Sfredette 378ec984a04Sfredette /* 379ec984a04Sfredette * XXX: Trace traps are a nightmare. 380ec984a04Sfredette * 381ec984a04Sfredette * HP-UX uses trap #1 for breakpoints, 382ec984a04Sfredette * NetBSD/m68k uses trap #2, 383ec984a04Sfredette * SUN 3.x uses trap #15, 384ec984a04Sfredette * DDB and KGDB uses trap #15 (for kernel breakpoints; 385ec984a04Sfredette * handled elsewhere). 386ec984a04Sfredette * 387ec984a04Sfredette * NetBSD and HP-UX traps both get mapped by locore.s into T_TRACE. 388ec984a04Sfredette * SUN 3.x traps get passed through as T_TRAP15 and are not really 389ec984a04Sfredette * supported yet. 390ec984a04Sfredette * 391ec984a04Sfredette * XXX: We should never get kernel-mode T_TRAP15 392ec984a04Sfredette * XXX: because locore.s now gives them special treatment. 393ec984a04Sfredette */ 394ec984a04Sfredette case T_TRAP15: /* kernel breakpoint */ 395ec984a04Sfredette tf.tf_sr &= ~PSL_T; 396ec984a04Sfredette goto done; 397ec984a04Sfredette 398ec984a04Sfredette case T_TRACE|T_USER: /* user trace trap */ 399ec984a04Sfredette #ifdef COMPAT_SUNOS 400ec984a04Sfredette /* 401ec984a04Sfredette * SunOS uses Trap #2 for a "CPU cache flush" 402ec984a04Sfredette * Just flush the on-chip caches and return. 403ec984a04Sfredette * XXX - Too bad NetBSD uses trap 2... 404ec984a04Sfredette */ 405ec984a04Sfredette if (p->p_emul == &emul_sunos) { 406ec984a04Sfredette /* get out fast */ 407ec984a04Sfredette goto done; 408ec984a04Sfredette } 409ec984a04Sfredette #endif 410ec984a04Sfredette /* FALLTHROUGH */ 411ec984a04Sfredette case T_TRACE: /* tracing a trap instruction */ 412ec984a04Sfredette case T_TRAP15|T_USER: /* SUN user trace trap */ 413ec984a04Sfredette tf.tf_sr &= ~PSL_T; 414ec984a04Sfredette sig = SIGTRAP; 415ec984a04Sfredette break; 416ec984a04Sfredette 417ec984a04Sfredette case T_ASTFLT: /* system async trap, cannot happen */ 418ec984a04Sfredette goto dopanic; 419ec984a04Sfredette 420ec984a04Sfredette case T_ASTFLT|T_USER: /* user async trap */ 421ec984a04Sfredette astpending = 0; 422ec984a04Sfredette /* T_SSIR is not used on a Sun2. */ 423ec984a04Sfredette if (p->p_flag & P_OWEUPC) { 424ec984a04Sfredette p->p_flag &= ~P_OWEUPC; 425ec984a04Sfredette ADDUPROF(p); 426ec984a04Sfredette } 427ec984a04Sfredette goto douret; 428ec984a04Sfredette 429ec984a04Sfredette case T_MMUFLT: /* kernel mode page fault */ 430ec984a04Sfredette /* Hacks to avoid calling VM code from debugger. */ 431ec984a04Sfredette #ifdef DDB 432ec984a04Sfredette if (db_recover != 0) 433ec984a04Sfredette goto dopanic; 434ec984a04Sfredette #endif 435ec984a04Sfredette #ifdef KGDB 436ec984a04Sfredette if (kgdb_recover != 0) 437ec984a04Sfredette goto dopanic; 438ec984a04Sfredette #endif 439ec984a04Sfredette /* 440ec984a04Sfredette * If we were doing profiling ticks or other user mode 441ec984a04Sfredette * stuff from interrupt code, Just Say No. 442ec984a04Sfredette */ 443ec984a04Sfredette if (p->p_addr->u_pcb.pcb_onfault == (caddr_t)fubail || 444ec984a04Sfredette p->p_addr->u_pcb.pcb_onfault == (caddr_t)subail) 445ec984a04Sfredette { 446ec984a04Sfredette #ifdef DEBUG 447ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 448ec984a04Sfredette printf("trap: copyfault fu/su bail\n"); 449ec984a04Sfredette Debugger(); 450ec984a04Sfredette } 451ec984a04Sfredette #endif 452ec984a04Sfredette goto copyfault; 453ec984a04Sfredette } 454ec984a04Sfredette /*FALLTHROUGH*/ 455ec984a04Sfredette 456ec984a04Sfredette case T_MMUFLT|T_USER: { /* page fault */ 457ec984a04Sfredette register vm_offset_t va; 458ec984a04Sfredette register struct vmspace *vm = p->p_vmspace; 459*821ec03eSchs register struct vm_map *map; 460ec984a04Sfredette int rv; 461ec984a04Sfredette vm_prot_t ftype; 462*821ec03eSchs extern struct vm_map *kernel_map; 463ec984a04Sfredette 464ec984a04Sfredette #ifdef DEBUG 465ec984a04Sfredette if ((mmudebug & MDB_WBFOLLOW) || MDB_ISPID(p->p_pid)) 466ec984a04Sfredette printf("trap: T_MMUFLT pid=%d, code=0x%x, v=0x%x, pc=0x%x, sr=0x%x\n", 467ec984a04Sfredette p->p_pid, code, v, tf.tf_pc, tf.tf_sr); 468ec984a04Sfredette #endif 469ec984a04Sfredette 470ec984a04Sfredette /* 471ec984a04Sfredette * It is only a kernel address space fault iff: 472ec984a04Sfredette * 1. (type & T_USER) == 0 and: (2 or 3) 473ec984a04Sfredette * 2. pcb_onfault not set or 474ec984a04Sfredette * 3. pcb_onfault set but supervisor space data fault 475ec984a04Sfredette * The last can occur during an exec() copyin where the 476ec984a04Sfredette * argument space is lazy-allocated. 477ec984a04Sfredette */ 478ec984a04Sfredette map = &vm->vm_map; 479ec984a04Sfredette if ((type & T_USER) == 0) { 480ec984a04Sfredette /* supervisor mode fault */ 481ec984a04Sfredette if ((p->p_addr->u_pcb.pcb_onfault == NULL) || KDFAULT(code)) 482ec984a04Sfredette map = kernel_map; 483ec984a04Sfredette } 484ec984a04Sfredette 485ec984a04Sfredette if (WRFAULT(code)) 486ec984a04Sfredette ftype = VM_PROT_READ | VM_PROT_WRITE; 487ec984a04Sfredette else 488ec984a04Sfredette ftype = VM_PROT_READ; 489ec984a04Sfredette va = m68k_trunc_page((vm_offset_t)v); 490ec984a04Sfredette 491ec984a04Sfredette /* 492ec984a04Sfredette * Need to resolve the fault. 493ec984a04Sfredette * 494ec984a04Sfredette * We give the pmap code a chance to resolve faults by 495ec984a04Sfredette * reloading translations that it was forced to unload. 496ec984a04Sfredette * This function does that, and calls vm_fault if it 497ec984a04Sfredette * could not resolve the fault by reloading the MMU. 498ec984a04Sfredette * This function may also, for example, disallow any 499ec984a04Sfredette * faults in the kernel text segment, etc. 500ec984a04Sfredette */ 501ec984a04Sfredette rv = _pmap_fault(map, va, ftype); 502ec984a04Sfredette 503ec984a04Sfredette #ifdef DEBUG 504ec984a04Sfredette if (rv && MDB_ISPID(p->p_pid)) { 505ec984a04Sfredette printf("vm_fault(%p, 0x%lx, 0x%x, 0) -> 0x%x\n", 506ec984a04Sfredette map, va, ftype, rv); 507ec984a04Sfredette if (mmudebug & MDB_WBFAILED) 508ec984a04Sfredette Debugger(); 509ec984a04Sfredette } 510ec984a04Sfredette #endif /* DEBUG */ 511ec984a04Sfredette 512ec984a04Sfredette /* 513ec984a04Sfredette * If this was a stack access we keep track of the maximum 514ec984a04Sfredette * accessed stack size. Also, if vm_fault gets a protection 515ec984a04Sfredette * failure it is due to accessing the stack region outside 516ec984a04Sfredette * the current limit and we need to reflect that as an access 517ec984a04Sfredette * error. 518ec984a04Sfredette */ 519ec984a04Sfredette if ((map != kernel_map) && ((caddr_t)va >= vm->vm_maxsaddr)) { 520ec984a04Sfredette if (rv == 0) { 521ec984a04Sfredette unsigned nss; 522ec984a04Sfredette 523ec984a04Sfredette nss = btoc((u_int)(USRSTACK-va)); 524ec984a04Sfredette if (nss > vm->vm_ssize) 525ec984a04Sfredette vm->vm_ssize = nss; 526ec984a04Sfredette } else if (rv == EACCES) 527ec984a04Sfredette rv = EFAULT; 528ec984a04Sfredette } 529ec984a04Sfredette if (rv == 0) 530ec984a04Sfredette goto finish; 531ec984a04Sfredette 532ec984a04Sfredette if ((type & T_USER) == 0) { 533ec984a04Sfredette /* supervisor mode fault */ 534ec984a04Sfredette if (p->p_addr->u_pcb.pcb_onfault) { 535ec984a04Sfredette #ifdef DEBUG 536ec984a04Sfredette if (mmudebug & MDB_CPFAULT) { 537ec984a04Sfredette printf("trap: copyfault pcb_onfault\n"); 538ec984a04Sfredette Debugger(); 539ec984a04Sfredette } 540ec984a04Sfredette #endif 541ec984a04Sfredette goto copyfault; 542ec984a04Sfredette } 543ec984a04Sfredette printf("vm_fault(%p, 0x%lx, 0x%x, 0) -> 0x%x\n", 544ec984a04Sfredette map, va, ftype, rv); 545ec984a04Sfredette goto dopanic; 546ec984a04Sfredette } 547ec984a04Sfredette ucode = v; 548ec984a04Sfredette if (rv == ENOMEM) { 549ec984a04Sfredette printf("UVM: pid %d (%s), uid %d killed: out of swap\n", 550ec984a04Sfredette p->p_pid, p->p_comm, 551ec984a04Sfredette p->p_cred && p->p_ucred ? 552ec984a04Sfredette p->p_ucred->cr_uid : -1); 553ec984a04Sfredette sig = SIGKILL; 554ec984a04Sfredette } else { 555ec984a04Sfredette sig = SIGSEGV; 556ec984a04Sfredette } 557ec984a04Sfredette break; 558ec984a04Sfredette } /* T_MMUFLT */ 559ec984a04Sfredette } /* switch */ 560ec984a04Sfredette 561ec984a04Sfredette finish: 562ec984a04Sfredette /* If trap was from supervisor mode, just return. */ 563ec984a04Sfredette if ((type & T_USER) == 0) 564ec984a04Sfredette goto done; 565ec984a04Sfredette /* Post a signal if necessary. */ 566ec984a04Sfredette if (sig != 0) 567ec984a04Sfredette trapsignal(p, sig, ucode); 568ec984a04Sfredette douret: 569ec984a04Sfredette userret(p, &tf, sticks); 570ec984a04Sfredette 571ec984a04Sfredette done:; 572ec984a04Sfredette /* XXX: Detect trap recursion? */ 573ec984a04Sfredette } 574ec984a04Sfredette 575ec984a04Sfredette /* 576ec984a04Sfredette * This is used if we hit a kernel breakpoint or trace trap 577ec984a04Sfredette * when there is no debugger installed (or not attached). 578ec984a04Sfredette * Drop into the PROM temporarily... 579ec984a04Sfredette */ 580ec984a04Sfredette int 581ec984a04Sfredette _nodb_trap(type, tf) 582ec984a04Sfredette int type; 583ec984a04Sfredette struct trapframe *tf; 584ec984a04Sfredette { 585ec984a04Sfredette 586ec984a04Sfredette printf("\r\nKernel "); 587ec984a04Sfredette if ((0 <= type) && (type < trap_types)) 588ec984a04Sfredette printf("%s", trap_type[type]); 589ec984a04Sfredette else 590ec984a04Sfredette printf("trap 0x%x", type); 591ec984a04Sfredette printf(", frame=%p\r\n", tf); 592ec984a04Sfredette printf("No debugger; doing PROM abort.\r\n"); 593ec984a04Sfredette printf("To continue, type: c <RETURN>\r\n"); 594ec984a04Sfredette prom_abort(); 595ec984a04Sfredette /* OK then, just resume... */ 596ec984a04Sfredette tf->tf_sr &= ~PSL_T; 597ec984a04Sfredette return(1); 598ec984a04Sfredette } 599ec984a04Sfredette 600ec984a04Sfredette /* 601ec984a04Sfredette * This is called by locore for supervisor-mode trace and 602ec984a04Sfredette * breakpoint traps. This is separate from trap() above 603ec984a04Sfredette * so that breakpoints in trap() will work. 604ec984a04Sfredette * 605ec984a04Sfredette * If we have both DDB and KGDB, let KGDB see it first, 606ec984a04Sfredette * because KGDB will just return 0 if not connected. 607ec984a04Sfredette */ 608ec984a04Sfredette void 609ec984a04Sfredette trap_kdebug(type, tf) 610ec984a04Sfredette int type; 611ec984a04Sfredette struct trapframe tf; 612ec984a04Sfredette { 613ec984a04Sfredette 614ec984a04Sfredette #ifdef KGDB 615ec984a04Sfredette /* Let KGDB handle it (if connected) */ 616ec984a04Sfredette if (kgdb_trap(type, &tf)) 617ec984a04Sfredette return; 618ec984a04Sfredette #endif 619ec984a04Sfredette #ifdef DDB 620ec984a04Sfredette /* Let DDB handle it. */ 621ec984a04Sfredette if (kdb_trap(type, &tf)) 622ec984a04Sfredette return; 623ec984a04Sfredette #endif 624ec984a04Sfredette 625ec984a04Sfredette /* Drop into the PROM temporarily... */ 626ec984a04Sfredette (void)_nodb_trap(type, &tf); 627ec984a04Sfredette } 628ec984a04Sfredette 629ec984a04Sfredette /* 630ec984a04Sfredette * Called by locore.s for an unexpected interrupt. 631ec984a04Sfredette * XXX - Almost identical to trap_kdebug... 632ec984a04Sfredette */ 633ec984a04Sfredette void 634ec984a04Sfredette straytrap(tf) 635ec984a04Sfredette struct trapframe tf; 636ec984a04Sfredette { 637ec984a04Sfredette int type = -1; 638ec984a04Sfredette 639ec984a04Sfredette printf("unexpected trap; vector=0x%x at pc=0x%x\n", 640ec984a04Sfredette tf.tf_vector, tf.tf_pc); 641ec984a04Sfredette 642ec984a04Sfredette #ifdef KGDB 643ec984a04Sfredette /* Let KGDB handle it (if connected) */ 644ec984a04Sfredette if (kgdb_trap(type, &tf)) 645ec984a04Sfredette return; 646ec984a04Sfredette #endif 647ec984a04Sfredette #ifdef DDB 648ec984a04Sfredette /* Let DDB handle it. */ 649ec984a04Sfredette if (kdb_trap(type, &tf)) 650ec984a04Sfredette return; 651ec984a04Sfredette #endif 652ec984a04Sfredette 653ec984a04Sfredette /* Drop into the PROM temporarily... */ 654ec984a04Sfredette (void)_nodb_trap(type, &tf); 655ec984a04Sfredette } 656