trap.c revision 1.2.2.3
1 1.2.2.3 jdolecek /* $NetBSD: trap.c,v 1.2.2.3 2002/09/06 08:35:49 jdolecek Exp $ */ 2 1.2.2.2 jdolecek 3 1.2.2.2 jdolecek /*- 4 1.2.2.2 jdolecek * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc. 5 1.2.2.2 jdolecek * All rights reserved. 6 1.2.2.2 jdolecek * 7 1.2.2.2 jdolecek * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 jdolecek * by Matthew Fredette. 9 1.2.2.2 jdolecek * 10 1.2.2.2 jdolecek * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 jdolecek * modification, are permitted provided that the following conditions 12 1.2.2.2 jdolecek * are met: 13 1.2.2.2 jdolecek * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 jdolecek * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 jdolecek * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 jdolecek * documentation and/or other materials provided with the distribution. 18 1.2.2.2 jdolecek * 3. All advertising materials mentioning features or use of this software 19 1.2.2.2 jdolecek * must display the following acknowledgement: 20 1.2.2.2 jdolecek * This product includes software developed by the NetBSD 21 1.2.2.2 jdolecek * Foundation, Inc. and its contributors. 22 1.2.2.2 jdolecek * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.2.2.2 jdolecek * contributors may be used to endorse or promote products derived 24 1.2.2.2 jdolecek * from this software without specific prior written permission. 25 1.2.2.2 jdolecek * 26 1.2.2.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.2.2.2 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.2.2.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.2.2.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.2.2.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.2.2.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.2.2.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.2.2.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.2.2.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.2.2.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.2.2.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 37 1.2.2.2 jdolecek */ 38 1.2.2.2 jdolecek 39 1.2.2.2 jdolecek /* $OpenBSD: trap.c,v 1.30 2001/09/19 20:50:56 mickey Exp $ */ 40 1.2.2.2 jdolecek 41 1.2.2.2 jdolecek /* 42 1.2.2.2 jdolecek * Copyright (c) 1998-2000 Michael Shalayeff 43 1.2.2.2 jdolecek * All rights reserved. 44 1.2.2.2 jdolecek * 45 1.2.2.2 jdolecek * Redistribution and use in source and binary forms, with or without 46 1.2.2.2 jdolecek * modification, are permitted provided that the following conditions 47 1.2.2.2 jdolecek * are met: 48 1.2.2.2 jdolecek * 1. Redistributions of source code must retain the above copyright 49 1.2.2.2 jdolecek * notice, this list of conditions and the following disclaimer. 50 1.2.2.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 51 1.2.2.2 jdolecek * notice, this list of conditions and the following disclaimer in the 52 1.2.2.2 jdolecek * documentation and/or other materials provided with the distribution. 53 1.2.2.2 jdolecek * 3. All advertising materials mentioning features or use of this software 54 1.2.2.2 jdolecek * must display the following acknowledgement: 55 1.2.2.2 jdolecek * This product includes software developed by Michael Shalayeff. 56 1.2.2.2 jdolecek * 4. The name of the author may not be used to endorse or promote products 57 1.2.2.2 jdolecek * derived from this software without specific prior written permission. 58 1.2.2.2 jdolecek * 59 1.2.2.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 60 1.2.2.2 jdolecek * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 61 1.2.2.2 jdolecek * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 62 1.2.2.2 jdolecek * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 63 1.2.2.2 jdolecek * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 64 1.2.2.2 jdolecek * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 65 1.2.2.2 jdolecek * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 66 1.2.2.2 jdolecek * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 67 1.2.2.2 jdolecek * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 68 1.2.2.2 jdolecek * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 69 1.2.2.2 jdolecek */ 70 1.2.2.2 jdolecek 71 1.2.2.2 jdolecek /* #define INTRDEBUG */ 72 1.2.2.2 jdolecek /* #define TRAPDEBUG */ 73 1.2.2.2 jdolecek /* #define USERTRACE */ 74 1.2.2.2 jdolecek 75 1.2.2.2 jdolecek #include "opt_kgdb.h" 76 1.2.2.2 jdolecek #include "opt_syscall_debug.h" 77 1.2.2.3 jdolecek #include "opt_ktrace.h" 78 1.2.2.3 jdolecek #include "opt_systrace.h" 79 1.2.2.2 jdolecek 80 1.2.2.2 jdolecek #include <sys/param.h> 81 1.2.2.2 jdolecek #include <sys/systm.h> 82 1.2.2.2 jdolecek #include <sys/kernel.h> 83 1.2.2.2 jdolecek #include <sys/syscall.h> 84 1.2.2.3 jdolecek #ifdef KTRACE 85 1.2.2.2 jdolecek #include <sys/ktrace.h> 86 1.2.2.3 jdolecek #endif 87 1.2.2.3 jdolecek #ifdef SYSTRACE 88 1.2.2.3 jdolecek #include <sys/systrace.h> 89 1.2.2.3 jdolecek #endif 90 1.2.2.2 jdolecek #include <sys/proc.h> 91 1.2.2.2 jdolecek #include <sys/signalvar.h> 92 1.2.2.2 jdolecek #include <sys/user.h> 93 1.2.2.2 jdolecek #include <sys/acct.h> 94 1.2.2.2 jdolecek #include <sys/signal.h> 95 1.2.2.2 jdolecek #include <sys/device.h> 96 1.2.2.2 jdolecek 97 1.2.2.2 jdolecek #include <net/netisr.h> 98 1.2.2.2 jdolecek 99 1.2.2.2 jdolecek #ifdef KGDB 100 1.2.2.2 jdolecek #include <sys/kgdb.h> 101 1.2.2.2 jdolecek #endif 102 1.2.2.2 jdolecek 103 1.2.2.2 jdolecek #include <uvm/uvm.h> 104 1.2.2.2 jdolecek 105 1.2.2.2 jdolecek #include <machine/iomod.h> 106 1.2.2.2 jdolecek #include <machine/cpufunc.h> 107 1.2.2.2 jdolecek #include <machine/reg.h> 108 1.2.2.2 jdolecek #include <machine/autoconf.h> 109 1.2.2.2 jdolecek 110 1.2.2.2 jdolecek #include <machine/db_machdep.h> 111 1.2.2.2 jdolecek 112 1.2.2.2 jdolecek #include <hppa/hppa/machdep.h> 113 1.2.2.2 jdolecek 114 1.2.2.2 jdolecek #if defined(INTRDEBUG) || defined(TRAPDEBUG) 115 1.2.2.2 jdolecek #include <ddb/db_output.h> 116 1.2.2.2 jdolecek #endif 117 1.2.2.2 jdolecek 118 1.2.2.2 jdolecek #if defined(DEBUG) || defined(DIAGNOSTIC) 119 1.2.2.2 jdolecek /* 120 1.2.2.2 jdolecek * 0x6fc1000 is a stwm r1, d(sr0, sp), which is the last 121 1.2.2.2 jdolecek * instruction in the function prologue that gcc -O0 uses. 122 1.2.2.2 jdolecek * When we have this instruction we know the relationship 123 1.2.2.2 jdolecek * between the stack pointer and the gcc -O0 frame pointer 124 1.2.2.2 jdolecek * (in r3, loaded with the initial sp) for the body of a 125 1.2.2.2 jdolecek * function. 126 1.2.2.2 jdolecek * 127 1.2.2.2 jdolecek * If the given instruction is a stwm r1, d(sr0, sp) where 128 1.2.2.2 jdolecek * d > 0, we evaluate to d, else we evaluate to zero. 129 1.2.2.2 jdolecek */ 130 1.2.2.2 jdolecek #define STWM_R1_D_SR0_SP(inst) \ 131 1.2.2.2 jdolecek (((inst) & 0xffffc001) == 0x6fc10000 ? (((inst) & 0x00003ff) >> 1) : 0) 132 1.2.2.2 jdolecek #endif /* DEBUG || DIAGNOSTIC */ 133 1.2.2.2 jdolecek 134 1.2.2.2 jdolecek const char *trap_type[] = { 135 1.2.2.2 jdolecek "invalid", 136 1.2.2.2 jdolecek "HPMC", 137 1.2.2.2 jdolecek "power failure", 138 1.2.2.2 jdolecek "recovery counter", 139 1.2.2.2 jdolecek "external interrupt", 140 1.2.2.2 jdolecek "LPMC", 141 1.2.2.2 jdolecek "ITLB miss fault", 142 1.2.2.2 jdolecek "instruction protection", 143 1.2.2.2 jdolecek "Illegal instruction", 144 1.2.2.2 jdolecek "break instruction", 145 1.2.2.2 jdolecek "privileged operation", 146 1.2.2.2 jdolecek "privileged register", 147 1.2.2.2 jdolecek "overflow", 148 1.2.2.2 jdolecek "conditional", 149 1.2.2.2 jdolecek "assist exception", 150 1.2.2.2 jdolecek "DTLB miss", 151 1.2.2.2 jdolecek "ITLB non-access miss", 152 1.2.2.2 jdolecek "DTLB non-access miss", 153 1.2.2.2 jdolecek "data protection/rights/alignment", 154 1.2.2.2 jdolecek "data break", 155 1.2.2.2 jdolecek "TLB dirty", 156 1.2.2.2 jdolecek "page reference", 157 1.2.2.2 jdolecek "assist emulation", 158 1.2.2.2 jdolecek "higher-priv transfer", 159 1.2.2.2 jdolecek "lower-priv transfer", 160 1.2.2.2 jdolecek "taken branch", 161 1.2.2.2 jdolecek "data access rights", 162 1.2.2.2 jdolecek "data protection", 163 1.2.2.2 jdolecek "unaligned data ref", 164 1.2.2.2 jdolecek }; 165 1.2.2.2 jdolecek int trap_types = sizeof(trap_type)/sizeof(trap_type[0]); 166 1.2.2.2 jdolecek 167 1.2.2.2 jdolecek int want_resched; 168 1.2.2.2 jdolecek volatile int astpending; 169 1.2.2.2 jdolecek 170 1.2.2.2 jdolecek void pmap_hptdump __P((void)); 171 1.2.2.2 jdolecek void syscall __P((struct trapframe *frame, int *args)); 172 1.2.2.2 jdolecek 173 1.2.2.2 jdolecek #ifdef USERTRACE 174 1.2.2.2 jdolecek /* 175 1.2.2.2 jdolecek * USERTRACE is a crude facility that traces the PC of 176 1.2.2.2 jdolecek * a single user process. This tracing is normally 177 1.2.2.2 jdolecek * activated by the dispatching of a certain syscall 178 1.2.2.2 jdolecek * with certain arguments - see the activation code in 179 1.2.2.2 jdolecek * syscall(). 180 1.2.2.2 jdolecek */ 181 1.2.2.2 jdolecek u_int rctr_next_iioq; 182 1.2.2.2 jdolecek #endif 183 1.2.2.2 jdolecek 184 1.2.2.2 jdolecek static __inline void 185 1.2.2.2 jdolecek userret (struct proc *p, register_t pc, u_quad_t oticks) 186 1.2.2.2 jdolecek { 187 1.2.2.2 jdolecek int sig; 188 1.2.2.2 jdolecek 189 1.2.2.2 jdolecek /* take pending signals */ 190 1.2.2.2 jdolecek while ((sig = CURSIG(p)) != 0) 191 1.2.2.2 jdolecek postsig(sig); 192 1.2.2.2 jdolecek 193 1.2.2.2 jdolecek p->p_priority = p->p_usrpri; 194 1.2.2.2 jdolecek if (want_resched) { 195 1.2.2.2 jdolecek /* 196 1.2.2.2 jdolecek * We're being preempted. 197 1.2.2.2 jdolecek */ 198 1.2.2.2 jdolecek preempt(NULL); 199 1.2.2.2 jdolecek while ((sig = CURSIG(p)) != 0) 200 1.2.2.2 jdolecek postsig(sig); 201 1.2.2.2 jdolecek } 202 1.2.2.2 jdolecek 203 1.2.2.2 jdolecek /* 204 1.2.2.2 jdolecek * If profiling, charge recent system time to the trapped pc. 205 1.2.2.2 jdolecek */ 206 1.2.2.2 jdolecek if (p->p_flag & P_PROFIL) { 207 1.2.2.2 jdolecek extern int psratio; 208 1.2.2.2 jdolecek 209 1.2.2.2 jdolecek addupc_task(p, pc, (int)(p->p_sticks - oticks) * psratio); 210 1.2.2.2 jdolecek } 211 1.2.2.2 jdolecek 212 1.2.2.2 jdolecek curcpu()->ci_schedstate.spc_curpriority = p->p_priority; 213 1.2.2.2 jdolecek } 214 1.2.2.2 jdolecek 215 1.2.2.2 jdolecek /* 216 1.2.2.2 jdolecek * This handles some messy kernel debugger details. 217 1.2.2.2 jdolecek * It dispatches into either kgdb or DDB, and knows 218 1.2.2.2 jdolecek * about some special things to do, like skipping over 219 1.2.2.2 jdolecek * break instructions and how to really set up for 220 1.2.2.2 jdolecek * a single-step. 221 1.2.2.2 jdolecek */ 222 1.2.2.2 jdolecek #if defined(KGDB) || defined(DDB) 223 1.2.2.2 jdolecek static int 224 1.2.2.2 jdolecek trap_kdebug(int type, int code, struct trapframe *frame) 225 1.2.2.2 jdolecek { 226 1.2.2.2 jdolecek int handled; 227 1.2.2.2 jdolecek u_int tf_iioq_head_old; 228 1.2.2.2 jdolecek u_int tf_iioq_tail_old; 229 1.2.2.2 jdolecek 230 1.2.2.2 jdolecek for(;;) { 231 1.2.2.2 jdolecek 232 1.2.2.2 jdolecek /* This trap has not been handled. */ 233 1.2.2.2 jdolecek handled = 0; 234 1.2.2.2 jdolecek 235 1.2.2.2 jdolecek /* Remember the instruction offset queue. */ 236 1.2.2.2 jdolecek tf_iioq_head_old = frame->tf_iioq_head; 237 1.2.2.2 jdolecek tf_iioq_tail_old = frame->tf_iioq_tail; 238 1.2.2.2 jdolecek 239 1.2.2.2 jdolecek #ifdef KGDB 240 1.2.2.2 jdolecek /* Let KGDB handle it (if connected) */ 241 1.2.2.2 jdolecek if (!handled) 242 1.2.2.2 jdolecek handled = kgdb_trap(type, frame); 243 1.2.2.2 jdolecek #endif 244 1.2.2.2 jdolecek #ifdef DDB 245 1.2.2.2 jdolecek /* Let DDB handle it. */ 246 1.2.2.2 jdolecek if (!handled) 247 1.2.2.2 jdolecek handled = kdb_trap(type, code, frame); 248 1.2.2.2 jdolecek #endif 249 1.2.2.2 jdolecek 250 1.2.2.2 jdolecek /* If this trap wasn't handled, return now. */ 251 1.2.2.2 jdolecek if (!handled) 252 1.2.2.2 jdolecek return(0); 253 1.2.2.2 jdolecek 254 1.2.2.2 jdolecek /* 255 1.2.2.2 jdolecek * If the instruction offset queue head changed, 256 1.2.2.2 jdolecek * but the offset queue tail didn't, assume that 257 1.2.2.2 jdolecek * the user wants to jump to the head offset, and 258 1.2.2.2 jdolecek * adjust the tail accordingly. This should fix 259 1.2.2.2 jdolecek * the kgdb `jump' command, and can help DDB users 260 1.2.2.2 jdolecek * who `set' the offset head but forget the tail. 261 1.2.2.2 jdolecek */ 262 1.2.2.2 jdolecek if (frame->tf_iioq_head != tf_iioq_head_old && 263 1.2.2.2 jdolecek frame->tf_iioq_tail == tf_iioq_tail_old) 264 1.2.2.2 jdolecek frame->tf_iioq_tail = frame->tf_iioq_head + 4; 265 1.2.2.2 jdolecek 266 1.2.2.2 jdolecek /* 267 1.2.2.2 jdolecek * This is some single-stepping support. 268 1.2.2.2 jdolecek * If we're trying to step through a nullified 269 1.2.2.2 jdolecek * instruction, just advance by hand and trap 270 1.2.2.2 jdolecek * again. Otherwise, load the recovery counter 271 1.2.2.2 jdolecek * with zero. 272 1.2.2.2 jdolecek */ 273 1.2.2.2 jdolecek if (frame->tf_ipsw & PSW_R) { 274 1.2.2.2 jdolecek #ifdef TRAPDEBUG 275 1.2.2.2 jdolecek printf("(single stepping at head 0x%x tail 0x%x)\n", frame->tf_iioq_head, frame->tf_iioq_tail); 276 1.2.2.2 jdolecek #endif 277 1.2.2.2 jdolecek if (frame->tf_ipsw & PSW_N) { 278 1.2.2.2 jdolecek #ifdef TRAPDEBUG 279 1.2.2.2 jdolecek printf("(single stepping past nullified)\n"); 280 1.2.2.2 jdolecek #endif 281 1.2.2.2 jdolecek 282 1.2.2.2 jdolecek /* Advance the program counter. */ 283 1.2.2.2 jdolecek frame->tf_iioq_head = frame->tf_iioq_tail; 284 1.2.2.2 jdolecek frame->tf_iioq_tail = frame->tf_iioq_head + 4; 285 1.2.2.2 jdolecek 286 1.2.2.2 jdolecek /* Clear flags. */ 287 1.2.2.2 jdolecek frame->tf_ipsw &= ~(PSW_N|PSW_X|PSW_Y|PSW_Z|PSW_B|PSW_T|PSW_H|PSW_L); 288 1.2.2.2 jdolecek 289 1.2.2.2 jdolecek /* Simulate another trap. */ 290 1.2.2.2 jdolecek type = T_RECOVERY; 291 1.2.2.2 jdolecek continue; 292 1.2.2.2 jdolecek } 293 1.2.2.2 jdolecek frame->tf_rctr = 0; 294 1.2.2.2 jdolecek } 295 1.2.2.2 jdolecek 296 1.2.2.2 jdolecek /* We handled this trap. */ 297 1.2.2.2 jdolecek return (1); 298 1.2.2.2 jdolecek } 299 1.2.2.2 jdolecek /* NOTREACHED */ 300 1.2.2.2 jdolecek } 301 1.2.2.2 jdolecek #else /* !KGDB && !DDB */ 302 1.2.2.2 jdolecek #define trap_kdebug(t, c, f) (0) 303 1.2.2.2 jdolecek #endif /* !KGDB && !DDB */ 304 1.2.2.2 jdolecek 305 1.2.2.2 jdolecek #ifdef DIAGNOSTIC 306 1.2.2.2 jdolecek /* 307 1.2.2.2 jdolecek * These functions give a crude usermode backtrace. They 308 1.2.2.2 jdolecek * really only work when code has been compiled without 309 1.2.2.2 jdolecek * optimization, as they assume a certain function prologue 310 1.2.2.2 jdolecek * sets up a frame pointer and stores the return pointer 311 1.2.2.2 jdolecek * and arguments in it. 312 1.2.2.2 jdolecek */ 313 1.2.2.2 jdolecek static void user_backtrace_raw __P((u_int, u_int)); 314 1.2.2.2 jdolecek static void 315 1.2.2.2 jdolecek user_backtrace_raw(u_int pc, u_int fp) 316 1.2.2.2 jdolecek { 317 1.2.2.2 jdolecek int frame_number; 318 1.2.2.2 jdolecek int arg_number; 319 1.2.2.2 jdolecek 320 1.2.2.3 jdolecek for (frame_number = 0; 321 1.2.2.3 jdolecek frame_number < 100 && pc > HPPA_PC_PRIV_MASK && fp; 322 1.2.2.3 jdolecek frame_number++) { 323 1.2.2.3 jdolecek 324 1.2.2.2 jdolecek printf("%3d: pc=%08x%s fp=0x%08x", frame_number, 325 1.2.2.2 jdolecek pc & ~HPPA_PC_PRIV_MASK, USERMODE(pc) ? "" : "**", fp); 326 1.2.2.2 jdolecek for(arg_number = 0; arg_number < 4; arg_number++) 327 1.2.2.2 jdolecek printf(" arg%d=0x%08x", arg_number, 328 1.2.2.2 jdolecek (int) fuword(HPPA_FRAME_CARG(arg_number, fp))); 329 1.2.2.2 jdolecek printf("\n"); 330 1.2.2.2 jdolecek pc = fuword(((register_t *) fp) - 5); /* fetch rp */ 331 1.2.2.2 jdolecek if (pc == -1) { 332 1.2.2.2 jdolecek printf(" fuword for pc failed\n"); 333 1.2.2.2 jdolecek break; 334 1.2.2.2 jdolecek } 335 1.2.2.2 jdolecek fp = fuword(((register_t *) fp) + 0); /* fetch previous fp */ 336 1.2.2.2 jdolecek if (fp == -1) { 337 1.2.2.2 jdolecek printf(" fuword for fp failed\n"); 338 1.2.2.2 jdolecek break; 339 1.2.2.2 jdolecek } 340 1.2.2.2 jdolecek } 341 1.2.2.2 jdolecek printf(" backtrace stopped with pc %08x fp 0x%08x\n", pc, fp); 342 1.2.2.2 jdolecek } 343 1.2.2.2 jdolecek 344 1.2.2.3 jdolecek static void user_backtrace __P((struct trapframe *, struct proc *, int)); 345 1.2.2.2 jdolecek static void 346 1.2.2.3 jdolecek user_backtrace(struct trapframe *tf, struct proc *p, int type) 347 1.2.2.2 jdolecek { 348 1.2.2.2 jdolecek u_int pc, fp, inst; 349 1.2.2.2 jdolecek 350 1.2.2.2 jdolecek /* 351 1.2.2.3 jdolecek * Display any trap type that we have. 352 1.2.2.3 jdolecek */ 353 1.2.2.3 jdolecek if (type >= 0) 354 1.2.2.3 jdolecek printf("pid %d (%s) trap #%d\n", 355 1.2.2.3 jdolecek p->p_pid, p->p_comm, type & ~T_USER); 356 1.2.2.3 jdolecek 357 1.2.2.3 jdolecek /* 358 1.2.2.2 jdolecek * Assuming that the frame pointer in r3 is valid, 359 1.2.2.2 jdolecek * dump out a stack trace. 360 1.2.2.2 jdolecek */ 361 1.2.2.2 jdolecek fp = tf->tf_r3; 362 1.2.2.2 jdolecek printf("pid %d (%s) backtrace, starting with fp 0x%08x\n", 363 1.2.2.2 jdolecek p->p_pid, p->p_comm, fp); 364 1.2.2.2 jdolecek user_backtrace_raw(tf->tf_iioq_head, fp); 365 1.2.2.2 jdolecek 366 1.2.2.2 jdolecek /* 367 1.2.2.2 jdolecek * In case the frame pointer in r3 is not valid, 368 1.2.2.2 jdolecek * assuming the stack pointer is valid and the 369 1.2.2.2 jdolecek * faulting function is a non-leaf, if we can 370 1.2.2.2 jdolecek * find its prologue we can recover its frame 371 1.2.2.2 jdolecek * pointer. 372 1.2.2.2 jdolecek */ 373 1.2.2.2 jdolecek pc = tf->tf_iioq_head; 374 1.2.2.2 jdolecek fp = tf->tf_sp - HPPA_FRAME_SIZE; 375 1.2.2.2 jdolecek printf("pid %d (%s) backtrace, starting with sp 0x%08x pc 0x%08x\n", 376 1.2.2.2 jdolecek p->p_pid, p->p_comm, tf->tf_sp, pc); 377 1.2.2.2 jdolecek for(pc &= ~HPPA_PC_PRIV_MASK; pc > 0; pc -= sizeof(inst)) { 378 1.2.2.2 jdolecek inst = fuword((register_t *) pc); 379 1.2.2.2 jdolecek if (inst == -1) { 380 1.2.2.2 jdolecek printf(" fuword for inst at pc %08x failed\n", pc); 381 1.2.2.2 jdolecek break; 382 1.2.2.2 jdolecek } 383 1.2.2.2 jdolecek /* Check for the prologue instruction that sets sp. */ 384 1.2.2.2 jdolecek if (STWM_R1_D_SR0_SP(inst)) { 385 1.2.2.2 jdolecek fp = tf->tf_sp - STWM_R1_D_SR0_SP(inst); 386 1.2.2.2 jdolecek printf(" sp from fp at pc %08x: %08x\n", pc, inst); 387 1.2.2.2 jdolecek break; 388 1.2.2.2 jdolecek } 389 1.2.2.2 jdolecek } 390 1.2.2.2 jdolecek user_backtrace_raw(tf->tf_iioq_head, fp); 391 1.2.2.2 jdolecek } 392 1.2.2.2 jdolecek #endif /* DIAGNOSTIC */ 393 1.2.2.2 jdolecek 394 1.2.2.2 jdolecek #ifdef DEBUG 395 1.2.2.2 jdolecek /* 396 1.2.2.2 jdolecek * This sanity-checks a trapframe. It is full of various 397 1.2.2.2 jdolecek * assumptions about what a healthy CPU state should be, 398 1.2.2.2 jdolecek * with some documented elsewhere, some not. 399 1.2.2.2 jdolecek */ 400 1.2.2.2 jdolecek struct trapframe *sanity_frame; 401 1.2.2.2 jdolecek struct proc *sanity_proc; 402 1.2.2.2 jdolecek int sanity_checked = 0; 403 1.2.2.2 jdolecek void frame_sanity_check __P((struct trapframe *, struct proc *)); 404 1.2.2.2 jdolecek void 405 1.2.2.2 jdolecek frame_sanity_check(struct trapframe *tf, struct proc *p) 406 1.2.2.2 jdolecek { 407 1.2.2.2 jdolecek extern int kernel_text; 408 1.2.2.2 jdolecek extern int etext; 409 1.2.2.2 jdolecek extern register_t kpsw; 410 1.2.2.2 jdolecek extern vaddr_t hpt_base; 411 1.2.2.2 jdolecek extern vsize_t hpt_mask; 412 1.2.2.2 jdolecek vsize_t uspace_size; 413 1.2.2.2 jdolecek #define SANITY(e) \ 414 1.2.2.2 jdolecek do { \ 415 1.2.2.2 jdolecek if (sanity_frame == NULL && !(e)) { \ 416 1.2.2.2 jdolecek sanity_frame = tf; \ 417 1.2.2.2 jdolecek sanity_proc = p; \ 418 1.2.2.2 jdolecek sanity_checked = __LINE__; \ 419 1.2.2.2 jdolecek } \ 420 1.2.2.2 jdolecek } while (/* CONSTCOND */ 0) 421 1.2.2.2 jdolecek 422 1.2.2.2 jdolecek SANITY((tf->tf_ipsw & kpsw) == kpsw); 423 1.2.2.2 jdolecek SANITY(tf->tf_hptm == hpt_mask && tf->tf_vtop == hpt_base); 424 1.2.2.2 jdolecek SANITY((kpsw & PSW_I) == 0 || tf->tf_eiem != 0); 425 1.2.2.2 jdolecek if (tf->tf_iisq_head == HPPA_SID_KERNEL) { 426 1.2.2.2 jdolecek /* 427 1.2.2.2 jdolecek * If the trap happened in the gateway 428 1.2.2.2 jdolecek * page, we take the easy way out and 429 1.2.2.2 jdolecek * assume that the trapframe is okay. 430 1.2.2.2 jdolecek */ 431 1.2.2.2 jdolecek if ((tf->tf_iioq_head & ~PAGE_MASK) != SYSCALLGATE) { 432 1.2.2.2 jdolecek SANITY(!USERMODE(tf->tf_iioq_head)); 433 1.2.2.2 jdolecek SANITY(!USERMODE(tf->tf_iioq_tail)); 434 1.2.2.2 jdolecek SANITY(tf->tf_iioq_head >= (u_int) &kernel_text); 435 1.2.2.2 jdolecek SANITY(tf->tf_iioq_head < (u_int) &etext); 436 1.2.2.2 jdolecek SANITY(tf->tf_iioq_tail >= (u_int) &kernel_text); 437 1.2.2.2 jdolecek SANITY(tf->tf_iioq_tail < (u_int) &etext); 438 1.2.2.2 jdolecek #ifdef HPPA_REDZONE 439 1.2.2.2 jdolecek uspace_size = HPPA_REDZONE; 440 1.2.2.2 jdolecek #else 441 1.2.2.2 jdolecek uspace_size = USPACE; 442 1.2.2.2 jdolecek #endif 443 1.2.2.2 jdolecek SANITY(p == NULL || 444 1.2.2.2 jdolecek ((tf->tf_sp >= (u_int)(p->p_addr) + NBPG && 445 1.2.2.2 jdolecek tf->tf_sp < (u_int)(p->p_addr) + uspace_size))); 446 1.2.2.2 jdolecek } 447 1.2.2.2 jdolecek } else { 448 1.2.2.2 jdolecek SANITY(USERMODE(tf->tf_iioq_head)); 449 1.2.2.2 jdolecek SANITY(USERMODE(tf->tf_iioq_tail)); 450 1.2.2.2 jdolecek SANITY(p != NULL && tf->tf_cr30 == kvtop((caddr_t)p->p_addr)); 451 1.2.2.2 jdolecek } 452 1.2.2.2 jdolecek #undef SANITY 453 1.2.2.2 jdolecek if (sanity_frame == tf) { 454 1.2.2.3 jdolecek (void) trap_kdebug(T_IBREAK, 0, tf); 455 1.2.2.2 jdolecek sanity_frame = NULL; 456 1.2.2.2 jdolecek sanity_proc = NULL; 457 1.2.2.2 jdolecek sanity_checked = 0; 458 1.2.2.2 jdolecek } 459 1.2.2.2 jdolecek } 460 1.2.2.2 jdolecek #endif /* DEBUG */ 461 1.2.2.2 jdolecek 462 1.2.2.2 jdolecek void 463 1.2.2.2 jdolecek trap(type, frame) 464 1.2.2.2 jdolecek int type; 465 1.2.2.2 jdolecek struct trapframe *frame; 466 1.2.2.2 jdolecek { 467 1.2.2.2 jdolecek struct proc *p = curproc; 468 1.2.2.2 jdolecek struct pcb *pcbp; 469 1.2.2.2 jdolecek register vaddr_t va; 470 1.2.2.2 jdolecek register struct vm_map *map; 471 1.2.2.2 jdolecek struct vmspace *vm; 472 1.2.2.2 jdolecek register vm_prot_t vftype; 473 1.2.2.2 jdolecek register pa_space_t space; 474 1.2.2.2 jdolecek u_int opcode; 475 1.2.2.2 jdolecek int ret; 476 1.2.2.2 jdolecek const char *tts; 477 1.2.2.2 jdolecek int type_raw; 478 1.2.2.2 jdolecek #ifdef DIAGNOSTIC 479 1.2.2.2 jdolecek extern int emergency_stack_start, emergency_stack_end; 480 1.2.2.2 jdolecek #endif 481 1.2.2.2 jdolecek 482 1.2.2.2 jdolecek type_raw = type & ~T_USER; 483 1.2.2.2 jdolecek opcode = frame->tf_iir; 484 1.2.2.2 jdolecek if (type_raw == T_ITLBMISS || type_raw == T_ITLBMISSNA) { 485 1.2.2.2 jdolecek va = frame->tf_iioq_head; 486 1.2.2.2 jdolecek space = frame->tf_iisq_head; 487 1.2.2.2 jdolecek vftype = VM_PROT_READ; /* XXX VM_PROT_EXECUTE ??? */ 488 1.2.2.2 jdolecek } else { 489 1.2.2.2 jdolecek va = frame->tf_ior; 490 1.2.2.2 jdolecek space = frame->tf_isr; 491 1.2.2.2 jdolecek vftype = inst_store(opcode) ? VM_PROT_WRITE : VM_PROT_READ; 492 1.2.2.2 jdolecek } 493 1.2.2.2 jdolecek 494 1.2.2.2 jdolecek #ifdef DIAGNOSTIC 495 1.2.2.2 jdolecek /* 496 1.2.2.2 jdolecek * If we are on the emergency stack, then we either got 497 1.2.2.2 jdolecek * a fault on the kernel stack, or we're just handling 498 1.2.2.2 jdolecek * a trap for the machine check handler (which also 499 1.2.2.2 jdolecek * runs on the emergency stack). 500 1.2.2.2 jdolecek * 501 1.2.2.2 jdolecek * We *very crudely* differentiate between the two cases 502 1.2.2.2 jdolecek * by checking the faulting instruction: if it is the 503 1.2.2.2 jdolecek * function prologue instruction that stores the old 504 1.2.2.2 jdolecek * frame pointer and updates the stack pointer, we assume 505 1.2.2.2 jdolecek * that we faulted on the kernel stack. 506 1.2.2.2 jdolecek * 507 1.2.2.2 jdolecek * In this case, not completing that instruction will 508 1.2.2.2 jdolecek * probably confuse backtraces in kgdb/ddb. Completing 509 1.2.2.2 jdolecek * it would be difficult, because we already faulted on 510 1.2.2.2 jdolecek * that part of the stack, so instead we fix up the 511 1.2.2.2 jdolecek * frame as if the function called has just returned. 512 1.2.2.2 jdolecek * This has peculiar knowledge about what values are in 513 1.2.2.2 jdolecek * what registers during the "normal gcc -g" prologue. 514 1.2.2.2 jdolecek */ 515 1.2.2.2 jdolecek if (&type >= &emergency_stack_start && 516 1.2.2.2 jdolecek &type < &emergency_stack_end && 517 1.2.2.2 jdolecek type != T_IBREAK && STWM_R1_D_SR0_SP(opcode)) { 518 1.2.2.2 jdolecek /* Restore the caller's frame pointer. */ 519 1.2.2.2 jdolecek frame->tf_r3 = frame->tf_r1; 520 1.2.2.2 jdolecek /* Restore the caller's instruction offsets. */ 521 1.2.2.2 jdolecek frame->tf_iioq_head = frame->tf_rp; 522 1.2.2.2 jdolecek frame->tf_iioq_tail = frame->tf_iioq_head + 4; 523 1.2.2.2 jdolecek goto dead_end; 524 1.2.2.2 jdolecek } 525 1.2.2.2 jdolecek #endif /* DIAGNOSTIC */ 526 1.2.2.2 jdolecek 527 1.2.2.2 jdolecek #ifdef DEBUG 528 1.2.2.2 jdolecek frame_sanity_check(frame, p); 529 1.2.2.2 jdolecek #endif /* DEBUG */ 530 1.2.2.2 jdolecek 531 1.2.2.2 jdolecek /* If this is a trap, not an interrupt, reenable interrupts. */ 532 1.2.2.2 jdolecek if (type_raw != T_INTERRUPT) 533 1.2.2.2 jdolecek mtctl(frame->tf_eiem, CR_EIEM); 534 1.2.2.2 jdolecek 535 1.2.2.2 jdolecek if (frame->tf_flags & TFF_LAST) 536 1.2.2.2 jdolecek p->p_md.md_regs = frame; 537 1.2.2.2 jdolecek 538 1.2.2.2 jdolecek if ((type & ~T_USER) > trap_types) 539 1.2.2.2 jdolecek tts = "reserved"; 540 1.2.2.2 jdolecek else 541 1.2.2.2 jdolecek tts = trap_type[type & ~T_USER]; 542 1.2.2.2 jdolecek 543 1.2.2.2 jdolecek #ifdef TRAPDEBUG 544 1.2.2.2 jdolecek if (type_raw != T_INTERRUPT && type_raw != T_IBREAK) 545 1.2.2.2 jdolecek printf("trap: %d, %s for %x:%x at %x:%x, fp=%p, rp=%x\n", 546 1.2.2.2 jdolecek type, tts, space, (u_int)va, frame->tf_iisq_head, 547 1.2.2.2 jdolecek frame->tf_iioq_head, frame, frame->tf_rp); 548 1.2.2.2 jdolecek else if (type_raw == T_IBREAK) 549 1.2.2.2 jdolecek printf("trap: break instruction %x:%x at %x:%x, fp=%p\n", 550 1.2.2.2 jdolecek break5(opcode), break13(opcode), 551 1.2.2.2 jdolecek frame->tf_iisq_head, frame->tf_iioq_head, frame); 552 1.2.2.2 jdolecek 553 1.2.2.2 jdolecek { 554 1.2.2.2 jdolecek extern int etext; 555 1.2.2.2 jdolecek if (frame < (struct trapframe *)&etext) { 556 1.2.2.2 jdolecek printf("trap: bogus frame ptr %p\n", frame); 557 1.2.2.2 jdolecek goto dead_end; 558 1.2.2.2 jdolecek } 559 1.2.2.2 jdolecek } 560 1.2.2.2 jdolecek #endif 561 1.2.2.2 jdolecek switch (type) { 562 1.2.2.2 jdolecek case T_NONEXIST: 563 1.2.2.2 jdolecek case T_NONEXIST|T_USER: 564 1.2.2.2 jdolecek #if !defined(DDB) && !defined(KGDB) 565 1.2.2.2 jdolecek /* we've got screwed up by the central scrutinizer */ 566 1.2.2.2 jdolecek panic ("trap: elvis has just left the building!"); 567 1.2.2.2 jdolecek break; 568 1.2.2.2 jdolecek #else 569 1.2.2.2 jdolecek goto dead_end; 570 1.2.2.2 jdolecek #endif 571 1.2.2.2 jdolecek case T_RECOVERY|T_USER: 572 1.2.2.2 jdolecek #ifdef USERTRACE 573 1.2.2.2 jdolecek for(;;) { 574 1.2.2.2 jdolecek if (frame->tf_iioq_head != rctr_next_iioq) 575 1.2.2.2 jdolecek printf("-%08x\nr %08x", 576 1.2.2.2 jdolecek rctr_next_iioq - 4, 577 1.2.2.2 jdolecek frame->tf_iioq_head); 578 1.2.2.2 jdolecek rctr_next_iioq = frame->tf_iioq_head + 4; 579 1.2.2.2 jdolecek if (frame->tf_ipsw & PSW_N) { 580 1.2.2.2 jdolecek /* Advance the program counter. */ 581 1.2.2.2 jdolecek frame->tf_iioq_head = frame->tf_iioq_tail; 582 1.2.2.2 jdolecek frame->tf_iioq_tail = frame->tf_iioq_head + 4; 583 1.2.2.2 jdolecek /* Clear flags. */ 584 1.2.2.2 jdolecek frame->tf_ipsw &= ~(PSW_N|PSW_X|PSW_Y|PSW_Z|PSW_B|PSW_T|PSW_H|PSW_L); 585 1.2.2.2 jdolecek /* Simulate another trap. */ 586 1.2.2.2 jdolecek continue; 587 1.2.2.2 jdolecek } 588 1.2.2.2 jdolecek break; 589 1.2.2.2 jdolecek } 590 1.2.2.2 jdolecek frame->tf_rctr = 0; 591 1.2.2.2 jdolecek break; 592 1.2.2.2 jdolecek #endif /* USERTRACE */ 593 1.2.2.2 jdolecek case T_RECOVERY: 594 1.2.2.2 jdolecek #if !defined(DDB) && !defined(KGDB) 595 1.2.2.2 jdolecek /* XXX will implement later */ 596 1.2.2.2 jdolecek printf ("trap: handicapped"); 597 1.2.2.2 jdolecek break; 598 1.2.2.2 jdolecek #else 599 1.2.2.2 jdolecek goto dead_end; 600 1.2.2.2 jdolecek #endif 601 1.2.2.2 jdolecek 602 1.2.2.2 jdolecek case T_EMULATION | T_USER: 603 1.2.2.2 jdolecek #ifdef FPEMUL 604 1.2.2.2 jdolecek hppa_fpu_emulate(frame, p); 605 1.2.2.2 jdolecek #else /* !FPEMUL */ 606 1.2.2.2 jdolecek /* 607 1.2.2.2 jdolecek * We don't have FPU emulation, so signal the 608 1.2.2.2 jdolecek * process with a SIGFPE. 609 1.2.2.2 jdolecek */ 610 1.2.2.2 jdolecek trapsignal(p, SIGFPE, frame->tf_iioq_head); 611 1.2.2.2 jdolecek #endif /* !FPEMUL */ 612 1.2.2.2 jdolecek break; 613 1.2.2.2 jdolecek 614 1.2.2.2 jdolecek #ifdef DIAGNOSTIC 615 1.2.2.2 jdolecek case T_EXCEPTION: 616 1.2.2.2 jdolecek panic("FPU/SFU emulation botch"); 617 1.2.2.2 jdolecek 618 1.2.2.2 jdolecek /* these just can't happen ever */ 619 1.2.2.2 jdolecek case T_PRIV_OP: 620 1.2.2.2 jdolecek case T_PRIV_REG: 621 1.2.2.2 jdolecek /* these just can't make it to the trap() ever */ 622 1.2.2.2 jdolecek case T_HPMC: case T_HPMC | T_USER: 623 1.2.2.2 jdolecek case T_EMULATION: 624 1.2.2.2 jdolecek #endif 625 1.2.2.2 jdolecek case T_IBREAK: 626 1.2.2.2 jdolecek case T_DATALIGN: 627 1.2.2.2 jdolecek case T_DBREAK: 628 1.2.2.2 jdolecek dead_end: 629 1.2.2.3 jdolecek if (type & T_USER) { 630 1.2.2.3 jdolecek #ifdef DEBUG 631 1.2.2.3 jdolecek user_backtrace(frame, p, type); 632 1.2.2.3 jdolecek #endif 633 1.2.2.3 jdolecek trapsignal(p, SIGILL, frame->tf_iioq_head); 634 1.2.2.3 jdolecek break; 635 1.2.2.3 jdolecek } 636 1.2.2.2 jdolecek if (trap_kdebug(type, va, frame)) 637 1.2.2.2 jdolecek return; 638 1.2.2.2 jdolecek else if (type == T_DATALIGN) 639 1.2.2.2 jdolecek panic ("trap: %s at 0x%x", tts, (u_int) va); 640 1.2.2.2 jdolecek else 641 1.2.2.2 jdolecek panic ("trap: no debugger for \"%s\" (%d)", tts, type); 642 1.2.2.2 jdolecek break; 643 1.2.2.2 jdolecek 644 1.2.2.2 jdolecek case T_IBREAK | T_USER: 645 1.2.2.2 jdolecek case T_DBREAK | T_USER: 646 1.2.2.2 jdolecek /* pass to user debugger */ 647 1.2.2.2 jdolecek break; 648 1.2.2.2 jdolecek 649 1.2.2.2 jdolecek case T_EXCEPTION | T_USER: /* co-proc assist trap */ 650 1.2.2.2 jdolecek trapsignal(p, SIGFPE, va); 651 1.2.2.2 jdolecek break; 652 1.2.2.2 jdolecek 653 1.2.2.2 jdolecek case T_OVERFLOW | T_USER: 654 1.2.2.2 jdolecek trapsignal(p, SIGFPE, va); 655 1.2.2.2 jdolecek break; 656 1.2.2.2 jdolecek 657 1.2.2.2 jdolecek case T_CONDITION | T_USER: 658 1.2.2.2 jdolecek break; 659 1.2.2.2 jdolecek 660 1.2.2.2 jdolecek case T_ILLEGAL | T_USER: 661 1.2.2.3 jdolecek #ifdef DEBUG 662 1.2.2.3 jdolecek user_backtrace(frame, p, type); 663 1.2.2.3 jdolecek #endif 664 1.2.2.2 jdolecek trapsignal(p, SIGILL, va); 665 1.2.2.2 jdolecek break; 666 1.2.2.2 jdolecek 667 1.2.2.2 jdolecek case T_PRIV_OP | T_USER: 668 1.2.2.3 jdolecek #ifdef DEBUG 669 1.2.2.3 jdolecek user_backtrace(frame, p, type); 670 1.2.2.3 jdolecek #endif 671 1.2.2.2 jdolecek trapsignal(p, SIGILL, va); 672 1.2.2.2 jdolecek break; 673 1.2.2.2 jdolecek 674 1.2.2.2 jdolecek case T_PRIV_REG | T_USER: 675 1.2.2.3 jdolecek #ifdef DEBUG 676 1.2.2.3 jdolecek user_backtrace(frame, p, type); 677 1.2.2.3 jdolecek #endif 678 1.2.2.2 jdolecek trapsignal(p, SIGILL, va); 679 1.2.2.2 jdolecek break; 680 1.2.2.2 jdolecek 681 1.2.2.2 jdolecek /* these should never got here */ 682 1.2.2.2 jdolecek case T_HIGHERPL | T_USER: 683 1.2.2.2 jdolecek case T_LOWERPL | T_USER: 684 1.2.2.2 jdolecek trapsignal(p, SIGSEGV, va); 685 1.2.2.2 jdolecek break; 686 1.2.2.2 jdolecek 687 1.2.2.2 jdolecek case T_IPROT | T_USER: 688 1.2.2.2 jdolecek case T_DPROT | T_USER: 689 1.2.2.2 jdolecek trapsignal(p, SIGSEGV, va); 690 1.2.2.2 jdolecek break; 691 1.2.2.2 jdolecek 692 1.2.2.2 jdolecek case T_DATACC: case T_USER | T_DATACC: 693 1.2.2.2 jdolecek case T_ITLBMISS: case T_USER | T_ITLBMISS: 694 1.2.2.2 jdolecek case T_DTLBMISS: case T_USER | T_DTLBMISS: 695 1.2.2.2 jdolecek case T_ITLBMISSNA: case T_USER | T_ITLBMISSNA: 696 1.2.2.2 jdolecek case T_DTLBMISSNA: case T_USER | T_DTLBMISSNA: 697 1.2.2.2 jdolecek case T_TLB_DIRTY: case T_USER | T_TLB_DIRTY: 698 1.2.2.2 jdolecek va = hppa_trunc_page(va); 699 1.2.2.2 jdolecek vm = p->p_vmspace; 700 1.2.2.2 jdolecek 701 1.2.2.2 jdolecek if (!vm) { 702 1.2.2.2 jdolecek #ifdef TRAPDEBUG 703 1.2.2.2 jdolecek printf("trap: no vm, p=%p\n", p); 704 1.2.2.2 jdolecek #endif 705 1.2.2.2 jdolecek goto dead_end; 706 1.2.2.2 jdolecek } 707 1.2.2.2 jdolecek 708 1.2.2.2 jdolecek /* 709 1.2.2.2 jdolecek * it could be a kernel map for exec_map faults 710 1.2.2.2 jdolecek */ 711 1.2.2.2 jdolecek if (!(type & T_USER) && space == HPPA_SID_KERNEL) 712 1.2.2.2 jdolecek map = kernel_map; 713 1.2.2.2 jdolecek else 714 1.2.2.2 jdolecek map = &vm->vm_map; 715 1.2.2.2 jdolecek 716 1.2.2.2 jdolecek if (map->pmap->pmap_space != space) { 717 1.2.2.2 jdolecek #ifdef TRAPDEBUG 718 1.2.2.2 jdolecek printf("trap: space missmatch %d != %d\n", 719 1.2.2.2 jdolecek space, map->pmap->pmap_space); 720 1.2.2.2 jdolecek #endif 721 1.2.2.2 jdolecek /* actually dump the user, crap the kernel */ 722 1.2.2.2 jdolecek goto dead_end; 723 1.2.2.2 jdolecek } 724 1.2.2.2 jdolecek 725 1.2.2.2 jdolecek /* Never call uvm_fault in interrupt context. */ 726 1.2.2.2 jdolecek KASSERT(hppa_intr_depth == 0); 727 1.2.2.2 jdolecek 728 1.2.2.2 jdolecek ret = uvm_fault(map, va, 0, vftype); 729 1.2.2.2 jdolecek 730 1.2.2.2 jdolecek #ifdef TRAPDEBUG 731 1.2.2.2 jdolecek printf("uvm_fault(%p, %x, %d, %d)=%d\n", 732 1.2.2.2 jdolecek map, (u_int)va, 0, vftype, ret); 733 1.2.2.2 jdolecek #endif 734 1.2.2.2 jdolecek 735 1.2.2.2 jdolecek /* 736 1.2.2.2 jdolecek * If this was a stack access we keep track of the maximum 737 1.2.2.2 jdolecek * accessed stack size. Also, if uvm_fault gets a protection 738 1.2.2.2 jdolecek * failure it is due to accessing the stack region outside 739 1.2.2.2 jdolecek * the current limit and we need to reflect that as an access 740 1.2.2.2 jdolecek * error. 741 1.2.2.2 jdolecek */ 742 1.2.2.2 jdolecek if (va >= (vaddr_t)vm->vm_maxsaddr + vm->vm_ssize) { 743 1.2.2.2 jdolecek if (ret == 0) { 744 1.2.2.2 jdolecek vsize_t nss = btoc(va - USRSTACK + NBPG); 745 1.2.2.2 jdolecek if (nss > vm->vm_ssize) 746 1.2.2.2 jdolecek vm->vm_ssize = nss; 747 1.2.2.2 jdolecek } else if (ret == EACCES) 748 1.2.2.2 jdolecek ret = EFAULT; 749 1.2.2.2 jdolecek } 750 1.2.2.2 jdolecek 751 1.2.2.2 jdolecek if (ret != 0) { 752 1.2.2.2 jdolecek if (type & T_USER) { 753 1.2.2.2 jdolecek printf("trapsignal: uvm_fault(%p, %x, %d, %d)=%d\n", 754 1.2.2.2 jdolecek map, (u_int)va, 0, vftype, ret); 755 1.2.2.2 jdolecek #ifdef DEBUG 756 1.2.2.3 jdolecek user_backtrace(frame, p, type); 757 1.2.2.2 jdolecek #endif 758 1.2.2.2 jdolecek trapsignal(p, SIGSEGV, frame->tf_ior); 759 1.2.2.2 jdolecek } else { 760 1.2.2.2 jdolecek if (p && p->p_addr->u_pcb.pcb_onfault) { 761 1.2.2.2 jdolecek #ifdef PMAPDEBUG 762 1.2.2.2 jdolecek printf("trap: copyin/out %d\n",ret); 763 1.2.2.2 jdolecek #endif 764 1.2.2.2 jdolecek pcbp = &p->p_addr->u_pcb; 765 1.2.2.2 jdolecek frame->tf_iioq_tail = 4 + 766 1.2.2.2 jdolecek (frame->tf_iioq_head = 767 1.2.2.2 jdolecek pcbp->pcb_onfault); 768 1.2.2.2 jdolecek pcbp->pcb_onfault = 0; 769 1.2.2.2 jdolecek break; 770 1.2.2.2 jdolecek } 771 1.2.2.2 jdolecek #if 1 772 1.2.2.2 jdolecek if (trap_kdebug (type, va, frame)) 773 1.2.2.2 jdolecek return; 774 1.2.2.2 jdolecek #else 775 1.2.2.2 jdolecek panic("trap: uvm_fault(%p, %x, %d, %d): %d", 776 1.2.2.2 jdolecek map, va, 0, vftype, ret); 777 1.2.2.2 jdolecek #endif 778 1.2.2.2 jdolecek } 779 1.2.2.2 jdolecek } 780 1.2.2.2 jdolecek break; 781 1.2.2.2 jdolecek 782 1.2.2.2 jdolecek case T_DATALIGN | T_USER: 783 1.2.2.3 jdolecek #ifdef DEBUG 784 1.2.2.3 jdolecek user_backtrace(frame, p, type); 785 1.2.2.3 jdolecek #endif 786 1.2.2.2 jdolecek trapsignal(p, SIGBUS, va); 787 1.2.2.2 jdolecek break; 788 1.2.2.2 jdolecek 789 1.2.2.2 jdolecek case T_INTERRUPT: 790 1.2.2.2 jdolecek case T_INTERRUPT|T_USER: 791 1.2.2.2 jdolecek hppa_intr(frame); 792 1.2.2.2 jdolecek mtctl(frame->tf_eiem, CR_EIEM); 793 1.2.2.2 jdolecek #if 0 794 1.2.2.2 jdolecek if (trap_kdebug (type, va, frame)) 795 1.2.2.2 jdolecek return; 796 1.2.2.2 jdolecek #endif 797 1.2.2.2 jdolecek break; 798 1.2.2.2 jdolecek case T_LOWERPL: 799 1.2.2.2 jdolecek case T_DPROT: 800 1.2.2.2 jdolecek case T_IPROT: 801 1.2.2.2 jdolecek case T_OVERFLOW: 802 1.2.2.2 jdolecek case T_CONDITION: 803 1.2.2.2 jdolecek case T_ILLEGAL: 804 1.2.2.2 jdolecek case T_HIGHERPL: 805 1.2.2.2 jdolecek case T_TAKENBR: 806 1.2.2.2 jdolecek case T_POWERFAIL: 807 1.2.2.2 jdolecek case T_LPMC: 808 1.2.2.2 jdolecek case T_PAGEREF: 809 1.2.2.2 jdolecek case T_DATAPID: case T_DATAPID | T_USER: 810 1.2.2.2 jdolecek if (0 /* T-chip */) { 811 1.2.2.2 jdolecek break; 812 1.2.2.2 jdolecek } 813 1.2.2.2 jdolecek /* FALLTHROUGH to unimplemented */ 814 1.2.2.2 jdolecek default: 815 1.2.2.2 jdolecek #if 1 816 1.2.2.2 jdolecek if (trap_kdebug (type, va, frame)) 817 1.2.2.2 jdolecek return; 818 1.2.2.2 jdolecek #endif 819 1.2.2.2 jdolecek panic ("trap: unimplemented \'%s\' (%d)", tts, type); 820 1.2.2.2 jdolecek } 821 1.2.2.2 jdolecek 822 1.2.2.2 jdolecek if (type & T_USER) 823 1.2.2.2 jdolecek userret(p, p->p_md.md_regs->tf_iioq_head, 0); 824 1.2.2.2 jdolecek 825 1.2.2.2 jdolecek #ifdef DEBUG 826 1.2.2.2 jdolecek frame_sanity_check(frame, p); 827 1.2.2.2 jdolecek if (frame->tf_flags & TFF_LAST && curproc != NULL) 828 1.2.2.2 jdolecek frame_sanity_check(curproc->p_md.md_regs, curproc); 829 1.2.2.2 jdolecek #endif /* DEBUG */ 830 1.2.2.2 jdolecek } 831 1.2.2.2 jdolecek 832 1.2.2.2 jdolecek void 833 1.2.2.2 jdolecek child_return(arg) 834 1.2.2.2 jdolecek void *arg; 835 1.2.2.2 jdolecek { 836 1.2.2.2 jdolecek struct proc *p = arg; 837 1.2.2.2 jdolecek 838 1.2.2.2 jdolecek userret(p, p->p_md.md_regs->tf_iioq_head, 0); 839 1.2.2.2 jdolecek #ifdef KTRACE 840 1.2.2.2 jdolecek if (KTRPOINT(p, KTR_SYSRET)) 841 1.2.2.2 jdolecek ktrsysret(p, SYS_fork, 0, 0); 842 1.2.2.2 jdolecek #endif 843 1.2.2.2 jdolecek #ifdef DEBUG 844 1.2.2.2 jdolecek frame_sanity_check(p->p_md.md_regs, p); 845 1.2.2.2 jdolecek #endif /* DEBUG */ 846 1.2.2.2 jdolecek } 847 1.2.2.2 jdolecek 848 1.2.2.2 jdolecek /* 849 1.2.2.2 jdolecek * call actual syscall routine 850 1.2.2.2 jdolecek * from the low-level syscall handler: 851 1.2.2.2 jdolecek * - all HPPA_FRAME_NARGS syscall's arguments supposed to be copied onto 852 1.2.2.2 jdolecek * our stack, this wins compared to copyin just needed amount anyway 853 1.2.2.2 jdolecek * - register args are copied onto stack too 854 1.2.2.2 jdolecek */ 855 1.2.2.2 jdolecek void 856 1.2.2.2 jdolecek syscall(frame, args) 857 1.2.2.2 jdolecek struct trapframe *frame; 858 1.2.2.2 jdolecek int *args; 859 1.2.2.2 jdolecek { 860 1.2.2.2 jdolecek register struct proc *p; 861 1.2.2.2 jdolecek register const struct sysent *callp; 862 1.2.2.2 jdolecek int nsys, code, argsize, error; 863 1.2.2.2 jdolecek int tmp; 864 1.2.2.2 jdolecek int rval[2]; 865 1.2.2.2 jdolecek 866 1.2.2.2 jdolecek uvmexp.syscalls++; 867 1.2.2.2 jdolecek 868 1.2.2.2 jdolecek #ifdef DEBUG 869 1.2.2.2 jdolecek frame_sanity_check(frame, curproc); 870 1.2.2.2 jdolecek #endif /* DEBUG */ 871 1.2.2.2 jdolecek 872 1.2.2.2 jdolecek if (!USERMODE(frame->tf_iioq_head)) 873 1.2.2.2 jdolecek panic("syscall"); 874 1.2.2.2 jdolecek 875 1.2.2.2 jdolecek p = curproc; 876 1.2.2.2 jdolecek p->p_md.md_regs = frame; 877 1.2.2.2 jdolecek nsys = p->p_emul->e_nsysent; 878 1.2.2.2 jdolecek callp = p->p_emul->e_sysent; 879 1.2.2.2 jdolecek code = frame->tf_t1; 880 1.2.2.2 jdolecek 881 1.2.2.2 jdolecek /* 882 1.2.2.2 jdolecek * Restarting a system call is touchy on the HPPA, 883 1.2.2.2 jdolecek * because syscall arguments are passed in registers 884 1.2.2.2 jdolecek * and the program counter of the syscall "point" 885 1.2.2.2 jdolecek * isn't easily divined. 886 1.2.2.2 jdolecek * 887 1.2.2.2 jdolecek * We handle the first problem by assuming that we 888 1.2.2.2 jdolecek * will have to restart this system call, so we 889 1.2.2.2 jdolecek * stuff the first four words of the original arguments 890 1.2.2.2 jdolecek * back into the frame as arg0...arg3, which is where 891 1.2.2.2 jdolecek * we found them in the first place. Any further 892 1.2.2.2 jdolecek * arguments are (still) on the user's stack and the 893 1.2.2.2 jdolecek * syscall code will fetch them from there (again). 894 1.2.2.2 jdolecek * 895 1.2.2.2 jdolecek * The program counter problem is addressed below. 896 1.2.2.2 jdolecek */ 897 1.2.2.2 jdolecek frame->tf_arg0 = args[0]; 898 1.2.2.2 jdolecek frame->tf_arg1 = args[1]; 899 1.2.2.2 jdolecek frame->tf_arg2 = args[2]; 900 1.2.2.2 jdolecek frame->tf_arg3 = args[3]; 901 1.2.2.2 jdolecek 902 1.2.2.2 jdolecek /* 903 1.2.2.2 jdolecek * Some special handling for the syscall(2) and 904 1.2.2.2 jdolecek * __syscall(2) system calls. 905 1.2.2.2 jdolecek */ 906 1.2.2.2 jdolecek switch (code) { 907 1.2.2.2 jdolecek case SYS_syscall: 908 1.2.2.2 jdolecek code = *args; 909 1.2.2.2 jdolecek args += 1; 910 1.2.2.2 jdolecek break; 911 1.2.2.2 jdolecek case SYS___syscall: 912 1.2.2.2 jdolecek if (callp != sysent) 913 1.2.2.2 jdolecek break; 914 1.2.2.2 jdolecek /* 915 1.2.2.2 jdolecek * NB: even though __syscall(2) takes a quad_t 916 1.2.2.2 jdolecek * containing the system call number, because 917 1.2.2.2 jdolecek * our argument copying word-swaps 64-bit arguments, 918 1.2.2.2 jdolecek * the least significant word of that quad_t 919 1.2.2.2 jdolecek * is the first word in the argument array. 920 1.2.2.2 jdolecek */ 921 1.2.2.2 jdolecek code = *args; 922 1.2.2.2 jdolecek args += 2; 923 1.2.2.2 jdolecek } 924 1.2.2.2 jdolecek 925 1.2.2.2 jdolecek /* 926 1.2.2.2 jdolecek * Stacks growing from lower addresses to higher 927 1.2.2.2 jdolecek * addresses are not really such a good idea, because 928 1.2.2.2 jdolecek * it makes it impossible to overlay a struct on top 929 1.2.2.2 jdolecek * of C stack arguments (the arguments appear in 930 1.2.2.2 jdolecek * reversed order). 931 1.2.2.2 jdolecek * 932 1.2.2.2 jdolecek * You can do the obvious thing (as locore.S does) and 933 1.2.2.2 jdolecek * copy argument words one by one, laying them out in 934 1.2.2.2 jdolecek * the "right" order in the destination buffer, but this 935 1.2.2.2 jdolecek * ends up word-swapping multi-word arguments (like off_t). 936 1.2.2.2 jdolecek * 937 1.2.2.2 jdolecek * To compensate, we have some automatically-generated 938 1.2.2.2 jdolecek * code that word-swaps these multi-word arguments. 939 1.2.2.2 jdolecek * Right now the script that generates this code is 940 1.2.2.2 jdolecek * in Perl, because I don't know awk. 941 1.2.2.2 jdolecek * 942 1.2.2.2 jdolecek * FIXME - this works only on native binaries and 943 1.2.2.2 jdolecek * will probably screw up any and all emulation. 944 1.2.2.2 jdolecek */ 945 1.2.2.2 jdolecek switch (code) { 946 1.2.2.2 jdolecek /* 947 1.2.2.2 jdolecek * BEGIN automatically generated 948 1.2.2.2 jdolecek * by /home/fredette/project/hppa/makescargfix.pl 949 1.2.2.2 jdolecek * do not edit! 950 1.2.2.2 jdolecek */ 951 1.2.2.2 jdolecek case SYS_pread: 952 1.2.2.2 jdolecek /* 953 1.2.2.2 jdolecek * syscallarg(int) fd; 954 1.2.2.2 jdolecek * syscallarg(void *) buf; 955 1.2.2.2 jdolecek * syscallarg(size_t) nbyte; 956 1.2.2.2 jdolecek * syscallarg(int) pad; 957 1.2.2.2 jdolecek * syscallarg(off_t) offset; 958 1.2.2.2 jdolecek */ 959 1.2.2.2 jdolecek tmp = args[4]; 960 1.2.2.2 jdolecek args[4] = args[4 + 1]; 961 1.2.2.2 jdolecek args[4 + 1] = tmp; 962 1.2.2.2 jdolecek break; 963 1.2.2.2 jdolecek case SYS_pwrite: 964 1.2.2.2 jdolecek /* 965 1.2.2.2 jdolecek * syscallarg(int) fd; 966 1.2.2.2 jdolecek * syscallarg(const void *) buf; 967 1.2.2.2 jdolecek * syscallarg(size_t) nbyte; 968 1.2.2.2 jdolecek * syscallarg(int) pad; 969 1.2.2.2 jdolecek * syscallarg(off_t) offset; 970 1.2.2.2 jdolecek */ 971 1.2.2.2 jdolecek tmp = args[4]; 972 1.2.2.2 jdolecek args[4] = args[4 + 1]; 973 1.2.2.2 jdolecek args[4 + 1] = tmp; 974 1.2.2.2 jdolecek break; 975 1.2.2.2 jdolecek case SYS_mmap: 976 1.2.2.2 jdolecek /* 977 1.2.2.2 jdolecek * syscallarg(void *) addr; 978 1.2.2.2 jdolecek * syscallarg(size_t) len; 979 1.2.2.2 jdolecek * syscallarg(int) prot; 980 1.2.2.2 jdolecek * syscallarg(int) flags; 981 1.2.2.2 jdolecek * syscallarg(int) fd; 982 1.2.2.2 jdolecek * syscallarg(long) pad; 983 1.2.2.2 jdolecek * syscallarg(off_t) pos; 984 1.2.2.2 jdolecek */ 985 1.2.2.2 jdolecek tmp = args[6]; 986 1.2.2.2 jdolecek args[6] = args[6 + 1]; 987 1.2.2.2 jdolecek args[6 + 1] = tmp; 988 1.2.2.2 jdolecek break; 989 1.2.2.2 jdolecek case SYS_lseek: 990 1.2.2.2 jdolecek /* 991 1.2.2.2 jdolecek * syscallarg(int) fd; 992 1.2.2.2 jdolecek * syscallarg(int) pad; 993 1.2.2.2 jdolecek * syscallarg(off_t) offset; 994 1.2.2.2 jdolecek */ 995 1.2.2.2 jdolecek tmp = args[2]; 996 1.2.2.2 jdolecek args[2] = args[2 + 1]; 997 1.2.2.2 jdolecek args[2 + 1] = tmp; 998 1.2.2.2 jdolecek break; 999 1.2.2.2 jdolecek case SYS_truncate: 1000 1.2.2.2 jdolecek /* 1001 1.2.2.2 jdolecek * syscallarg(const char *) path; 1002 1.2.2.2 jdolecek * syscallarg(int) pad; 1003 1.2.2.2 jdolecek * syscallarg(off_t) length; 1004 1.2.2.2 jdolecek */ 1005 1.2.2.2 jdolecek tmp = args[2]; 1006 1.2.2.2 jdolecek args[2] = args[2 + 1]; 1007 1.2.2.2 jdolecek args[2 + 1] = tmp; 1008 1.2.2.2 jdolecek break; 1009 1.2.2.2 jdolecek case SYS_ftruncate: 1010 1.2.2.2 jdolecek /* 1011 1.2.2.2 jdolecek * syscallarg(int) fd; 1012 1.2.2.2 jdolecek * syscallarg(int) pad; 1013 1.2.2.2 jdolecek * syscallarg(off_t) length; 1014 1.2.2.2 jdolecek */ 1015 1.2.2.2 jdolecek tmp = args[2]; 1016 1.2.2.2 jdolecek args[2] = args[2 + 1]; 1017 1.2.2.2 jdolecek args[2 + 1] = tmp; 1018 1.2.2.2 jdolecek break; 1019 1.2.2.2 jdolecek case SYS_preadv: 1020 1.2.2.2 jdolecek /* 1021 1.2.2.2 jdolecek * syscallarg(int) fd; 1022 1.2.2.2 jdolecek * syscallarg(const struct iovec *) iovp; 1023 1.2.2.2 jdolecek * syscallarg(int) iovcnt; 1024 1.2.2.2 jdolecek * syscallarg(int) pad; 1025 1.2.2.2 jdolecek * syscallarg(off_t) offset; 1026 1.2.2.2 jdolecek */ 1027 1.2.2.2 jdolecek tmp = args[4]; 1028 1.2.2.2 jdolecek args[4] = args[4 + 1]; 1029 1.2.2.2 jdolecek args[4 + 1] = tmp; 1030 1.2.2.2 jdolecek break; 1031 1.2.2.2 jdolecek case SYS_pwritev: 1032 1.2.2.2 jdolecek /* 1033 1.2.2.2 jdolecek * syscallarg(int) fd; 1034 1.2.2.2 jdolecek * syscallarg(const struct iovec *) iovp; 1035 1.2.2.2 jdolecek * syscallarg(int) iovcnt; 1036 1.2.2.2 jdolecek * syscallarg(int) pad; 1037 1.2.2.2 jdolecek * syscallarg(off_t) offset; 1038 1.2.2.2 jdolecek */ 1039 1.2.2.2 jdolecek tmp = args[4]; 1040 1.2.2.2 jdolecek args[4] = args[4 + 1]; 1041 1.2.2.2 jdolecek args[4 + 1] = tmp; 1042 1.2.2.2 jdolecek break; 1043 1.2.2.2 jdolecek default: 1044 1.2.2.2 jdolecek break; 1045 1.2.2.2 jdolecek /* 1046 1.2.2.2 jdolecek * END automatically generated 1047 1.2.2.2 jdolecek * by /home/fredette/project/hppa/makescargfix.pl 1048 1.2.2.2 jdolecek * do not edit! 1049 1.2.2.2 jdolecek */ 1050 1.2.2.2 jdolecek } 1051 1.2.2.2 jdolecek 1052 1.2.2.2 jdolecek #ifdef USERTRACE 1053 1.2.2.2 jdolecek if (0) { 1054 1.2.2.3 jdolecek user_backtrace(frame, p, -1); 1055 1.2.2.2 jdolecek frame->tf_ipsw |= PSW_R; 1056 1.2.2.2 jdolecek frame->tf_rctr = 0; 1057 1.2.2.2 jdolecek printf("r %08x", frame->tf_iioq_head); 1058 1.2.2.2 jdolecek rctr_next_iioq = frame->tf_iioq_head + 4; 1059 1.2.2.2 jdolecek } 1060 1.2.2.2 jdolecek #endif 1061 1.2.2.2 jdolecek 1062 1.2.2.2 jdolecek if (code < 0 || code >= nsys) 1063 1.2.2.2 jdolecek callp += p->p_emul->e_nosys; /* bad syscall # */ 1064 1.2.2.2 jdolecek else 1065 1.2.2.2 jdolecek callp += code; 1066 1.2.2.2 jdolecek argsize = callp->sy_argsize; 1067 1.2.2.2 jdolecek 1068 1.2.2.3 jdolecek if ((error = trace_enter(p, code, args, rval)) != 0) 1069 1.2.2.3 jdolecek goto bad; 1070 1.2.2.2 jdolecek 1071 1.2.2.2 jdolecek rval[0] = 0; 1072 1.2.2.2 jdolecek rval[1] = 0; 1073 1.2.2.2 jdolecek switch (error = (*callp->sy_call)(p, args, rval)) { 1074 1.2.2.2 jdolecek case 0: 1075 1.2.2.2 jdolecek p = curproc; /* changes on exec() */ 1076 1.2.2.2 jdolecek frame = p->p_md.md_regs; 1077 1.2.2.2 jdolecek frame->tf_ret0 = rval[0]; 1078 1.2.2.2 jdolecek frame->tf_ret1 = rval[1]; 1079 1.2.2.2 jdolecek frame->tf_t1 = 0; 1080 1.2.2.2 jdolecek break; 1081 1.2.2.2 jdolecek case ERESTART: 1082 1.2.2.2 jdolecek /* 1083 1.2.2.2 jdolecek * Now we have to wind back the instruction 1084 1.2.2.2 jdolecek * offset queue to the point where the system 1085 1.2.2.2 jdolecek * call will be made again. This is inherently 1086 1.2.2.2 jdolecek * tied to the SYSCALL macro. 1087 1.2.2.2 jdolecek * 1088 1.2.2.2 jdolecek * Currently, the part of the SYSCALL macro 1089 1.2.2.2 jdolecek * that we want to rerun reads as: 1090 1.2.2.2 jdolecek * 1091 1.2.2.2 jdolecek * ldil L%SYSCALLGATE, r1 1092 1.2.2.2 jdolecek * ble 4(sr7, r1) 1093 1.2.2.2 jdolecek * ldi __CONCAT(SYS_,x), t1 1094 1.2.2.2 jdolecek * ldw HPPA_FRAME_ERP(sr0,sp), rp 1095 1.2.2.2 jdolecek * 1096 1.2.2.2 jdolecek * And our offset queue head points to the 1097 1.2.2.2 jdolecek * final ldw instruction. So we need to 1098 1.2.2.2 jdolecek * subtract twelve to reach the ldil. 1099 1.2.2.2 jdolecek */ 1100 1.2.2.2 jdolecek frame->tf_iioq_head -= 12; 1101 1.2.2.2 jdolecek frame->tf_iioq_tail = frame->tf_iioq_head + 4; 1102 1.2.2.2 jdolecek break; 1103 1.2.2.2 jdolecek case EJUSTRETURN: 1104 1.2.2.2 jdolecek p = curproc; 1105 1.2.2.2 jdolecek break; 1106 1.2.2.2 jdolecek default: 1107 1.2.2.3 jdolecek bad: 1108 1.2.2.2 jdolecek if (p->p_emul->e_errno) 1109 1.2.2.2 jdolecek error = p->p_emul->e_errno[error]; 1110 1.2.2.2 jdolecek frame->tf_t1 = error; 1111 1.2.2.2 jdolecek break; 1112 1.2.2.2 jdolecek } 1113 1.2.2.3 jdolecek 1114 1.2.2.3 jdolecek trace_exit(p, code, args, rval, error); 1115 1.2.2.3 jdolecek 1116 1.2.2.2 jdolecek userret(p, frame->tf_iioq_head, 0); 1117 1.2.2.2 jdolecek #ifdef DEBUG 1118 1.2.2.2 jdolecek frame_sanity_check(frame, p); 1119 1.2.2.2 jdolecek #endif /* DEBUG */ 1120 1.2.2.2 jdolecek } 1121
Indexes created Wed Oct 22 13:09:56 GMT 2025