Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* traps.c: high-level exception handler for FR-V |
| 2 | * |
| 3 | * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/signal.h> |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/mm.h> |
| 17 | #include <linux/types.h> |
| 18 | #include <linux/user.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/linkage.h> |
| 21 | #include <linux/init.h> |
| 22 | |
| 23 | #include <asm/setup.h> |
| 24 | #include <asm/fpu.h> |
| 25 | #include <asm/system.h> |
| 26 | #include <asm/uaccess.h> |
| 27 | #include <asm/pgtable.h> |
| 28 | #include <asm/siginfo.h> |
| 29 | #include <asm/unaligned.h> |
| 30 | |
| 31 | void show_backtrace(struct pt_regs *, unsigned long); |
| 32 | |
| 33 | extern asmlinkage void __break_hijack_kernel_event(void); |
| 34 | |
| 35 | /*****************************************************************************/ |
| 36 | /* |
| 37 | * instruction access error |
| 38 | */ |
| 39 | asmlinkage void insn_access_error(unsigned long esfr1, unsigned long epcr0, unsigned long esr0) |
| 40 | { |
| 41 | siginfo_t info; |
| 42 | |
| 43 | die_if_kernel("-- Insn Access Error --\n" |
| 44 | "EPCR0 : %08lx\n" |
| 45 | "ESR0 : %08lx\n", |
| 46 | epcr0, esr0); |
| 47 | |
| 48 | info.si_signo = SIGSEGV; |
| 49 | info.si_code = SEGV_ACCERR; |
| 50 | info.si_errno = 0; |
| 51 | info.si_addr = (void *) ((epcr0 & EPCR0_V) ? (epcr0 & EPCR0_PC) : __frame->pc); |
| 52 | |
| 53 | force_sig_info(info.si_signo, &info, current); |
| 54 | } /* end insn_access_error() */ |
| 55 | |
| 56 | /*****************************************************************************/ |
| 57 | /* |
| 58 | * handler for: |
| 59 | * - illegal instruction |
| 60 | * - privileged instruction |
| 61 | * - unsupported trap |
| 62 | * - debug exceptions |
| 63 | */ |
| 64 | asmlinkage void illegal_instruction(unsigned long esfr1, unsigned long epcr0, unsigned long esr0) |
| 65 | { |
| 66 | siginfo_t info; |
| 67 | |
| 68 | die_if_kernel("-- Illegal Instruction --\n" |
| 69 | "EPCR0 : %08lx\n" |
| 70 | "ESR0 : %08lx\n" |
| 71 | "ESFR1 : %08lx\n", |
| 72 | epcr0, esr0, esfr1); |
| 73 | |
| 74 | info.si_errno = 0; |
| 75 | info.si_addr = (void *) ((epcr0 & EPCR0_PC) ? (epcr0 & EPCR0_PC) : __frame->pc); |
| 76 | |
| 77 | switch (__frame->tbr & TBR_TT) { |
| 78 | case TBR_TT_ILLEGAL_INSTR: |
| 79 | info.si_signo = SIGILL; |
| 80 | info.si_code = ILL_ILLOPC; |
| 81 | break; |
| 82 | case TBR_TT_PRIV_INSTR: |
| 83 | info.si_signo = SIGILL; |
| 84 | info.si_code = ILL_PRVOPC; |
| 85 | break; |
| 86 | case TBR_TT_TRAP2 ... TBR_TT_TRAP126: |
| 87 | info.si_signo = SIGILL; |
| 88 | info.si_code = ILL_ILLTRP; |
| 89 | break; |
| 90 | /* GDB uses "tira gr0, #1" as a breakpoint instruction. */ |
| 91 | case TBR_TT_TRAP1: |
| 92 | case TBR_TT_BREAK: |
| 93 | info.si_signo = SIGTRAP; |
| 94 | info.si_code = |
| 95 | (__frame->__status & REG__STATUS_STEPPED) ? TRAP_TRACE : TRAP_BRKPT; |
| 96 | break; |
| 97 | } |
| 98 | |
| 99 | force_sig_info(info.si_signo, &info, current); |
| 100 | } /* end illegal_instruction() */ |
| 101 | |
| 102 | /*****************************************************************************/ |
| 103 | /* |
| 104 | * |
| 105 | */ |
| 106 | asmlinkage void media_exception(unsigned long msr0, unsigned long msr1) |
| 107 | { |
| 108 | siginfo_t info; |
| 109 | |
| 110 | die_if_kernel("-- Media Exception --\n" |
| 111 | "MSR0 : %08lx\n" |
| 112 | "MSR1 : %08lx\n", |
| 113 | msr0, msr1); |
| 114 | |
| 115 | info.si_signo = SIGFPE; |
| 116 | info.si_code = FPE_MDAOVF; |
| 117 | info.si_errno = 0; |
| 118 | info.si_addr = (void *) __frame->pc; |
| 119 | |
| 120 | force_sig_info(info.si_signo, &info, current); |
| 121 | } /* end media_exception() */ |
| 122 | |
| 123 | /*****************************************************************************/ |
| 124 | /* |
| 125 | * instruction or data access exception |
| 126 | */ |
| 127 | asmlinkage void memory_access_exception(unsigned long esr0, |
| 128 | unsigned long ear0, |
| 129 | unsigned long epcr0) |
| 130 | { |
| 131 | siginfo_t info; |
| 132 | |
| 133 | #ifdef CONFIG_MMU |
| 134 | unsigned long fixup; |
| 135 | |
| 136 | if ((esr0 & ESRx_EC) == ESRx_EC_DATA_ACCESS) |
| 137 | if (handle_misalignment(esr0, ear0, epcr0) == 0) |
| 138 | return; |
| 139 | |
| 140 | if ((fixup = search_exception_table(__frame->pc)) != 0) { |
| 141 | __frame->pc = fixup; |
| 142 | return; |
| 143 | } |
| 144 | #endif |
| 145 | |
| 146 | die_if_kernel("-- Memory Access Exception --\n" |
| 147 | "ESR0 : %08lx\n" |
| 148 | "EAR0 : %08lx\n" |
| 149 | "EPCR0 : %08lx\n", |
| 150 | esr0, ear0, epcr0); |
| 151 | |
| 152 | info.si_signo = SIGSEGV; |
| 153 | info.si_code = SEGV_ACCERR; |
| 154 | info.si_errno = 0; |
| 155 | info.si_addr = NULL; |
| 156 | |
| 157 | if ((esr0 & (ESRx_VALID | ESR0_EAV)) == (ESRx_VALID | ESR0_EAV)) |
| 158 | info.si_addr = (void *) ear0; |
| 159 | |
| 160 | force_sig_info(info.si_signo, &info, current); |
| 161 | |
| 162 | } /* end memory_access_exception() */ |
| 163 | |
| 164 | /*****************************************************************************/ |
| 165 | /* |
| 166 | * data access error |
| 167 | * - double-word data load from CPU control area (0xFExxxxxx) |
| 168 | * - read performed on inactive or self-refreshing SDRAM |
| 169 | * - error notification from slave device |
| 170 | * - misaligned address |
| 171 | * - access to out of bounds memory region |
| 172 | * - user mode accessing privileged memory region |
| 173 | * - write to R/O memory region |
| 174 | */ |
| 175 | asmlinkage void data_access_error(unsigned long esfr1, unsigned long esr15, unsigned long ear15) |
| 176 | { |
| 177 | siginfo_t info; |
| 178 | |
| 179 | die_if_kernel("-- Data Access Error --\n" |
| 180 | "ESR15 : %08lx\n" |
| 181 | "EAR15 : %08lx\n", |
| 182 | esr15, ear15); |
| 183 | |
| 184 | info.si_signo = SIGSEGV; |
| 185 | info.si_code = SEGV_ACCERR; |
| 186 | info.si_errno = 0; |
| 187 | info.si_addr = (void *) |
| 188 | (((esr15 & (ESRx_VALID|ESR15_EAV)) == (ESRx_VALID|ESR15_EAV)) ? ear15 : 0); |
| 189 | |
| 190 | force_sig_info(info.si_signo, &info, current); |
| 191 | } /* end data_access_error() */ |
| 192 | |
| 193 | /*****************************************************************************/ |
| 194 | /* |
| 195 | * data store error - should only happen if accessing inactive or self-refreshing SDRAM |
| 196 | */ |
| 197 | asmlinkage void data_store_error(unsigned long esfr1, unsigned long esr15) |
| 198 | { |
| 199 | die_if_kernel("-- Data Store Error --\n" |
| 200 | "ESR15 : %08lx\n", |
| 201 | esr15); |
| 202 | BUG(); |
| 203 | } /* end data_store_error() */ |
| 204 | |
| 205 | /*****************************************************************************/ |
| 206 | /* |
| 207 | * |
| 208 | */ |
| 209 | asmlinkage void division_exception(unsigned long esfr1, unsigned long esr0, unsigned long isr) |
| 210 | { |
| 211 | siginfo_t info; |
| 212 | |
| 213 | die_if_kernel("-- Division Exception --\n" |
| 214 | "ESR0 : %08lx\n" |
| 215 | "ISR : %08lx\n", |
| 216 | esr0, isr); |
| 217 | |
| 218 | info.si_signo = SIGFPE; |
| 219 | info.si_code = FPE_INTDIV; |
| 220 | info.si_errno = 0; |
| 221 | info.si_addr = (void *) __frame->pc; |
| 222 | |
| 223 | force_sig_info(info.si_signo, &info, current); |
| 224 | } /* end division_exception() */ |
| 225 | |
| 226 | /*****************************************************************************/ |
| 227 | /* |
| 228 | * |
| 229 | */ |
| 230 | asmlinkage void compound_exception(unsigned long esfr1, |
| 231 | unsigned long esr0, unsigned long esr14, unsigned long esr15, |
| 232 | unsigned long msr0, unsigned long msr1) |
| 233 | { |
| 234 | die_if_kernel("-- Compound Exception --\n" |
| 235 | "ESR0 : %08lx\n" |
| 236 | "ESR15 : %08lx\n" |
| 237 | "ESR15 : %08lx\n" |
| 238 | "MSR0 : %08lx\n" |
| 239 | "MSR1 : %08lx\n", |
| 240 | esr0, esr14, esr15, msr0, msr1); |
| 241 | BUG(); |
| 242 | } /* end compound_exception() */ |
| 243 | |
| 244 | /*****************************************************************************/ |
| 245 | /* |
| 246 | * The architecture-independent backtrace generator |
| 247 | */ |
| 248 | void dump_stack(void) |
| 249 | { |
| 250 | show_stack(NULL, NULL); |
| 251 | } |
| 252 | |
| 253 | void show_stack(struct task_struct *task, unsigned long *sp) |
| 254 | { |
| 255 | } |
| 256 | |
| 257 | void show_trace_task(struct task_struct *tsk) |
| 258 | { |
| 259 | printk("CONTEXT: stack=0x%lx frame=0x%p LR=0x%lx RET=0x%lx\n", |
| 260 | tsk->thread.sp, tsk->thread.frame, tsk->thread.lr, tsk->thread.sched_lr); |
| 261 | } |
| 262 | |
| 263 | static const char *regnames[] = { |
| 264 | "PSR ", "ISR ", "CCR ", "CCCR", |
| 265 | "LR ", "LCR ", "PC ", "_stt", |
| 266 | "sys ", "GR8*", "GNE0", "GNE1", |
| 267 | "IACH", "IACL", |
| 268 | "TBR ", "SP ", "FP ", "GR3 ", |
| 269 | "GR4 ", "GR5 ", "GR6 ", "GR7 ", |
| 270 | "GR8 ", "GR9 ", "GR10", "GR11", |
| 271 | "GR12", "GR13", "GR14", "GR15", |
| 272 | "GR16", "GR17", "GR18", "GR19", |
| 273 | "GR20", "GR21", "GR22", "GR23", |
| 274 | "GR24", "GR25", "GR26", "GR27", |
| 275 | "EFRM", "CURR", "GR30", "BFRM" |
| 276 | }; |
| 277 | |
| 278 | void show_regs(struct pt_regs *regs) |
| 279 | { |
| 280 | uint32_t *reg; |
| 281 | int loop; |
| 282 | |
| 283 | printk("\n"); |
| 284 | |
| 285 | printk("Frame: @%08x [%s]\n", |
| 286 | (uint32_t) regs, |
| 287 | regs->psr & PSR_S ? "kernel" : "user"); |
| 288 | |
| 289 | reg = (uint32_t *) regs; |
| 290 | for (loop = 0; loop < REG__END; loop++) { |
| 291 | printk("%s %08x", regnames[loop + 0], reg[loop + 0]); |
| 292 | |
| 293 | if (loop == REG__END - 1 || loop % 5 == 4) |
| 294 | printk("\n"); |
| 295 | else |
| 296 | printk(" | "); |
| 297 | } |
| 298 | |
| 299 | printk("Process %s (pid: %d)\n", current->comm, current->pid); |
| 300 | } |
| 301 | |
| 302 | void die_if_kernel(const char *str, ...) |
| 303 | { |
| 304 | char buffer[256]; |
| 305 | va_list va; |
| 306 | |
| 307 | if (user_mode(__frame)) |
| 308 | return; |
| 309 | |
| 310 | va_start(va, str); |
| 311 | vsprintf(buffer, str, va); |
| 312 | va_end(va); |
| 313 | |
| 314 | console_verbose(); |
| 315 | printk("\n===================================\n"); |
| 316 | printk("%s\n", buffer); |
| 317 | show_backtrace(__frame, 0); |
| 318 | |
| 319 | __break_hijack_kernel_event(); |
| 320 | do_exit(SIGSEGV); |
| 321 | } |
| 322 | |
| 323 | /*****************************************************************************/ |
| 324 | /* |
| 325 | * dump the contents of an exception frame |
| 326 | */ |
| 327 | static void show_backtrace_regs(struct pt_regs *frame) |
| 328 | { |
| 329 | uint32_t *reg; |
| 330 | int loop; |
| 331 | |
| 332 | /* print the registers for this frame */ |
| 333 | printk("<-- %s Frame: @%p -->\n", |
| 334 | frame->psr & PSR_S ? "Kernel Mode" : "User Mode", |
| 335 | frame); |
| 336 | |
| 337 | reg = (uint32_t *) frame; |
| 338 | for (loop = 0; loop < REG__END; loop++) { |
| 339 | printk("%s %08x", regnames[loop + 0], reg[loop + 0]); |
| 340 | |
| 341 | if (loop == REG__END - 1 || loop % 5 == 4) |
| 342 | printk("\n"); |
| 343 | else |
| 344 | printk(" | "); |
| 345 | } |
| 346 | |
| 347 | printk("--------\n"); |
| 348 | } /* end show_backtrace_regs() */ |
| 349 | |
| 350 | /*****************************************************************************/ |
| 351 | /* |
| 352 | * generate a backtrace of the kernel stack |
| 353 | */ |
| 354 | void show_backtrace(struct pt_regs *frame, unsigned long sp) |
| 355 | { |
| 356 | struct pt_regs *frame0; |
| 357 | unsigned long tos = 0, stop = 0, base; |
| 358 | int format; |
| 359 | |
| 360 | base = ((((unsigned long) frame) + 8191) & ~8191) - sizeof(struct user_context); |
| 361 | frame0 = (struct pt_regs *) base; |
| 362 | |
| 363 | if (sp) { |
| 364 | tos = sp; |
| 365 | stop = (unsigned long) frame; |
| 366 | } |
| 367 | |
| 368 | printk("\nProcess %s (pid: %d)\n\n", current->comm, current->pid); |
| 369 | |
| 370 | for (;;) { |
| 371 | /* dump stack segment between frames */ |
| 372 | //printk("%08lx -> %08lx\n", tos, stop); |
| 373 | format = 0; |
| 374 | while (tos < stop) { |
| 375 | if (format == 0) |
| 376 | printk(" %04lx :", tos & 0xffff); |
| 377 | |
| 378 | printk(" %08lx", *(unsigned long *) tos); |
| 379 | |
| 380 | tos += 4; |
| 381 | format++; |
| 382 | if (format == 8) { |
| 383 | printk("\n"); |
| 384 | format = 0; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | if (format > 0) |
| 389 | printk("\n"); |
| 390 | |
| 391 | /* dump frame 0 outside of the loop */ |
| 392 | if (frame == frame0) |
| 393 | break; |
| 394 | |
| 395 | tos = frame->sp; |
| 396 | if (((unsigned long) frame) + sizeof(*frame) != tos) { |
| 397 | printk("-- TOS %08lx does not follow frame %p --\n", |
| 398 | tos, frame); |
| 399 | break; |
| 400 | } |
| 401 | |
| 402 | show_backtrace_regs(frame); |
| 403 | |
| 404 | /* dump the stack between this frame and the next */ |
| 405 | stop = (unsigned long) frame->next_frame; |
| 406 | if (stop != base && |
| 407 | (stop < tos || |
| 408 | stop > base || |
| 409 | (stop < base && stop + sizeof(*frame) > base) || |
| 410 | stop & 3)) { |
| 411 | printk("-- next_frame %08lx is invalid (range %08lx-%08lx) --\n", |
| 412 | stop, tos, base); |
| 413 | break; |
| 414 | } |
| 415 | |
| 416 | /* move to next frame */ |
| 417 | frame = frame->next_frame; |
| 418 | } |
| 419 | |
| 420 | /* we can always dump frame 0, even if the rest of the stack is corrupt */ |
| 421 | show_backtrace_regs(frame0); |
| 422 | |
| 423 | } /* end show_backtrace() */ |
| 424 | |
| 425 | /*****************************************************************************/ |
| 426 | /* |
| 427 | * initialise traps |
| 428 | */ |
| 429 | void __init trap_init (void) |
| 430 | { |
| 431 | } /* end trap_init() */ |