| 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1994 - 1999, 2000, 01, 06 Ralf Baechle |
| 7 | * Copyright (C) 1995, 1996 Paul M. Antoine |
| 8 | * Copyright (C) 1998 Ulf Carlsson |
| 9 | * Copyright (C) 1999 Silicon Graphics, Inc. |
| 10 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com |
| 11 | * Copyright (C) 2002, 2003, 2004, 2005, 2007 Maciej W. Rozycki |
| 12 | * Copyright (C) 2000, 2001, 2012 MIPS Technologies, Inc. All rights reserved. |
| 13 | */ |
| 14 | #include <linux/bug.h> |
| 15 | #include <linux/compiler.h> |
| 16 | #include <linux/context_tracking.h> |
| 17 | #include <linux/kexec.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/smp.h> |
| 24 | #include <linux/spinlock.h> |
| 25 | #include <linux/kallsyms.h> |
| 26 | #include <linux/bootmem.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/ptrace.h> |
| 29 | #include <linux/kgdb.h> |
| 30 | #include <linux/kdebug.h> |
| 31 | #include <linux/kprobes.h> |
| 32 | #include <linux/notifier.h> |
| 33 | #include <linux/kdb.h> |
| 34 | #include <linux/irq.h> |
| 35 | #include <linux/perf_event.h> |
| 36 | |
| 37 | #include <asm/bootinfo.h> |
| 38 | #include <asm/branch.h> |
| 39 | #include <asm/break.h> |
| 40 | #include <asm/cop2.h> |
| 41 | #include <asm/cpu.h> |
| 42 | #include <asm/dsp.h> |
| 43 | #include <asm/fpu.h> |
| 44 | #include <asm/fpu_emulator.h> |
| 45 | #include <asm/idle.h> |
| 46 | #include <asm/mipsregs.h> |
| 47 | #include <asm/mipsmtregs.h> |
| 48 | #include <asm/module.h> |
| 49 | #include <asm/pgtable.h> |
| 50 | #include <asm/ptrace.h> |
| 51 | #include <asm/sections.h> |
| 52 | #include <asm/tlbdebug.h> |
| 53 | #include <asm/traps.h> |
| 54 | #include <asm/uaccess.h> |
| 55 | #include <asm/watch.h> |
| 56 | #include <asm/mmu_context.h> |
| 57 | #include <asm/types.h> |
| 58 | #include <asm/stacktrace.h> |
| 59 | #include <asm/uasm.h> |
| 60 | |
| 61 | extern void check_wait(void); |
| 62 | extern asmlinkage void rollback_handle_int(void); |
| 63 | extern asmlinkage void handle_int(void); |
| 64 | extern u32 handle_tlbl[]; |
| 65 | extern u32 handle_tlbs[]; |
| 66 | extern u32 handle_tlbm[]; |
| 67 | extern asmlinkage void handle_adel(void); |
| 68 | extern asmlinkage void handle_ades(void); |
| 69 | extern asmlinkage void handle_ibe(void); |
| 70 | extern asmlinkage void handle_dbe(void); |
| 71 | extern asmlinkage void handle_sys(void); |
| 72 | extern asmlinkage void handle_bp(void); |
| 73 | extern asmlinkage void handle_ri(void); |
| 74 | extern asmlinkage void handle_ri_rdhwr_vivt(void); |
| 75 | extern asmlinkage void handle_ri_rdhwr(void); |
| 76 | extern asmlinkage void handle_cpu(void); |
| 77 | extern asmlinkage void handle_ov(void); |
| 78 | extern asmlinkage void handle_tr(void); |
| 79 | extern asmlinkage void handle_fpe(void); |
| 80 | extern asmlinkage void handle_mdmx(void); |
| 81 | extern asmlinkage void handle_watch(void); |
| 82 | extern asmlinkage void handle_mt(void); |
| 83 | extern asmlinkage void handle_dsp(void); |
| 84 | extern asmlinkage void handle_mcheck(void); |
| 85 | extern asmlinkage void handle_reserved(void); |
| 86 | |
| 87 | void (*board_be_init)(void); |
| 88 | int (*board_be_handler)(struct pt_regs *regs, int is_fixup); |
| 89 | void (*board_nmi_handler_setup)(void); |
| 90 | void (*board_ejtag_handler_setup)(void); |
| 91 | void (*board_bind_eic_interrupt)(int irq, int regset); |
| 92 | void (*board_ebase_setup)(void); |
| 93 | void __cpuinitdata(*board_cache_error_setup)(void); |
| 94 | |
| 95 | static void show_raw_backtrace(unsigned long reg29) |
| 96 | { |
| 97 | unsigned long *sp = (unsigned long *)(reg29 & ~3); |
| 98 | unsigned long addr; |
| 99 | |
| 100 | printk("Call Trace:"); |
| 101 | #ifdef CONFIG_KALLSYMS |
| 102 | printk("\n"); |
| 103 | #endif |
| 104 | while (!kstack_end(sp)) { |
| 105 | unsigned long __user *p = |
| 106 | (unsigned long __user *)(unsigned long)sp++; |
| 107 | if (__get_user(addr, p)) { |
| 108 | printk(" (Bad stack address)"); |
| 109 | break; |
| 110 | } |
| 111 | if (__kernel_text_address(addr)) |
| 112 | print_ip_sym(addr); |
| 113 | } |
| 114 | printk("\n"); |
| 115 | } |
| 116 | |
| 117 | #ifdef CONFIG_KALLSYMS |
| 118 | int raw_show_trace; |
| 119 | static int __init set_raw_show_trace(char *str) |
| 120 | { |
| 121 | raw_show_trace = 1; |
| 122 | return 1; |
| 123 | } |
| 124 | __setup("raw_show_trace", set_raw_show_trace); |
| 125 | #endif |
| 126 | |
| 127 | static void show_backtrace(struct task_struct *task, const struct pt_regs *regs) |
| 128 | { |
| 129 | unsigned long sp = regs->regs[29]; |
| 130 | unsigned long ra = regs->regs[31]; |
| 131 | unsigned long pc = regs->cp0_epc; |
| 132 | |
| 133 | if (!task) |
| 134 | task = current; |
| 135 | |
| 136 | if (raw_show_trace || !__kernel_text_address(pc)) { |
| 137 | show_raw_backtrace(sp); |
| 138 | return; |
| 139 | } |
| 140 | printk("Call Trace:\n"); |
| 141 | do { |
| 142 | print_ip_sym(pc); |
| 143 | pc = unwind_stack(task, &sp, pc, &ra); |
| 144 | } while (pc); |
| 145 | printk("\n"); |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * This routine abuses get_user()/put_user() to reference pointers |
| 150 | * with at least a bit of error checking ... |
| 151 | */ |
| 152 | static void show_stacktrace(struct task_struct *task, |
| 153 | const struct pt_regs *regs) |
| 154 | { |
| 155 | const int field = 2 * sizeof(unsigned long); |
| 156 | long stackdata; |
| 157 | int i; |
| 158 | unsigned long __user *sp = (unsigned long __user *)regs->regs[29]; |
| 159 | |
| 160 | printk("Stack :"); |
| 161 | i = 0; |
| 162 | while ((unsigned long) sp & (PAGE_SIZE - 1)) { |
| 163 | if (i && ((i % (64 / field)) == 0)) |
| 164 | printk("\n "); |
| 165 | if (i > 39) { |
| 166 | printk(" ..."); |
| 167 | break; |
| 168 | } |
| 169 | |
| 170 | if (__get_user(stackdata, sp++)) { |
| 171 | printk(" (Bad stack address)"); |
| 172 | break; |
| 173 | } |
| 174 | |
| 175 | printk(" %0*lx", field, stackdata); |
| 176 | i++; |
| 177 | } |
| 178 | printk("\n"); |
| 179 | show_backtrace(task, regs); |
| 180 | } |
| 181 | |
| 182 | void show_stack(struct task_struct *task, unsigned long *sp) |
| 183 | { |
| 184 | struct pt_regs regs; |
| 185 | if (sp) { |
| 186 | regs.regs[29] = (unsigned long)sp; |
| 187 | regs.regs[31] = 0; |
| 188 | regs.cp0_epc = 0; |
| 189 | } else { |
| 190 | if (task && task != current) { |
| 191 | regs.regs[29] = task->thread.reg29; |
| 192 | regs.regs[31] = 0; |
| 193 | regs.cp0_epc = task->thread.reg31; |
| 194 | #ifdef CONFIG_KGDB_KDB |
| 195 | } else if (atomic_read(&kgdb_active) != -1 && |
| 196 | kdb_current_regs) { |
| 197 | memcpy(®s, kdb_current_regs, sizeof(regs)); |
| 198 | #endif /* CONFIG_KGDB_KDB */ |
| 199 | } else { |
| 200 | prepare_frametrace(®s); |
| 201 | } |
| 202 | } |
| 203 | show_stacktrace(task, ®s); |
| 204 | } |
| 205 | |
| 206 | static void show_code(unsigned int __user *pc) |
| 207 | { |
| 208 | long i; |
| 209 | unsigned short __user *pc16 = NULL; |
| 210 | |
| 211 | printk("\nCode:"); |
| 212 | |
| 213 | if ((unsigned long)pc & 1) |
| 214 | pc16 = (unsigned short __user *)((unsigned long)pc & ~1); |
| 215 | for(i = -3 ; i < 6 ; i++) { |
| 216 | unsigned int insn; |
| 217 | if (pc16 ? __get_user(insn, pc16 + i) : __get_user(insn, pc + i)) { |
| 218 | printk(" (Bad address in epc)\n"); |
| 219 | break; |
| 220 | } |
| 221 | printk("%c%0*x%c", (i?' ':'<'), pc16 ? 4 : 8, insn, (i?' ':'>')); |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | static void __show_regs(const struct pt_regs *regs) |
| 226 | { |
| 227 | const int field = 2 * sizeof(unsigned long); |
| 228 | unsigned int cause = regs->cp0_cause; |
| 229 | int i; |
| 230 | |
| 231 | show_regs_print_info(KERN_DEFAULT); |
| 232 | |
| 233 | /* |
| 234 | * Saved main processor registers |
| 235 | */ |
| 236 | for (i = 0; i < 32; ) { |
| 237 | if ((i % 4) == 0) |
| 238 | printk("$%2d :", i); |
| 239 | if (i == 0) |
| 240 | printk(" %0*lx", field, 0UL); |
| 241 | else if (i == 26 || i == 27) |
| 242 | printk(" %*s", field, ""); |
| 243 | else |
| 244 | printk(" %0*lx", field, regs->regs[i]); |
| 245 | |
| 246 | i++; |
| 247 | if ((i % 4) == 0) |
| 248 | printk("\n"); |
| 249 | } |
| 250 | |
| 251 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
| 252 | printk("Acx : %0*lx\n", field, regs->acx); |
| 253 | #endif |
| 254 | printk("Hi : %0*lx\n", field, regs->hi); |
| 255 | printk("Lo : %0*lx\n", field, regs->lo); |
| 256 | |
| 257 | /* |
| 258 | * Saved cp0 registers |
| 259 | */ |
| 260 | printk("epc : %0*lx %pS\n", field, regs->cp0_epc, |
| 261 | (void *) regs->cp0_epc); |
| 262 | printk(" %s\n", print_tainted()); |
| 263 | printk("ra : %0*lx %pS\n", field, regs->regs[31], |
| 264 | (void *) regs->regs[31]); |
| 265 | |
| 266 | printk("Status: %08x ", (uint32_t) regs->cp0_status); |
| 267 | |
| 268 | if (cpu_has_3kex) { |
| 269 | if (regs->cp0_status & ST0_KUO) |
| 270 | printk("KUo "); |
| 271 | if (regs->cp0_status & ST0_IEO) |
| 272 | printk("IEo "); |
| 273 | if (regs->cp0_status & ST0_KUP) |
| 274 | printk("KUp "); |
| 275 | if (regs->cp0_status & ST0_IEP) |
| 276 | printk("IEp "); |
| 277 | if (regs->cp0_status & ST0_KUC) |
| 278 | printk("KUc "); |
| 279 | if (regs->cp0_status & ST0_IEC) |
| 280 | printk("IEc "); |
| 281 | } else if (cpu_has_4kex) { |
| 282 | if (regs->cp0_status & ST0_KX) |
| 283 | printk("KX "); |
| 284 | if (regs->cp0_status & ST0_SX) |
| 285 | printk("SX "); |
| 286 | if (regs->cp0_status & ST0_UX) |
| 287 | printk("UX "); |
| 288 | switch (regs->cp0_status & ST0_KSU) { |
| 289 | case KSU_USER: |
| 290 | printk("USER "); |
| 291 | break; |
| 292 | case KSU_SUPERVISOR: |
| 293 | printk("SUPERVISOR "); |
| 294 | break; |
| 295 | case KSU_KERNEL: |
| 296 | printk("KERNEL "); |
| 297 | break; |
| 298 | default: |
| 299 | printk("BAD_MODE "); |
| 300 | break; |
| 301 | } |
| 302 | if (regs->cp0_status & ST0_ERL) |
| 303 | printk("ERL "); |
| 304 | if (regs->cp0_status & ST0_EXL) |
| 305 | printk("EXL "); |
| 306 | if (regs->cp0_status & ST0_IE) |
| 307 | printk("IE "); |
| 308 | } |
| 309 | printk("\n"); |
| 310 | |
| 311 | printk("Cause : %08x\n", cause); |
| 312 | |
| 313 | cause = (cause & CAUSEF_EXCCODE) >> CAUSEB_EXCCODE; |
| 314 | if (1 <= cause && cause <= 5) |
| 315 | printk("BadVA : %0*lx\n", field, regs->cp0_badvaddr); |
| 316 | |
| 317 | printk("PrId : %08x (%s)\n", read_c0_prid(), |
| 318 | cpu_name_string()); |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * FIXME: really the generic show_regs should take a const pointer argument. |
| 323 | */ |
| 324 | void show_regs(struct pt_regs *regs) |
| 325 | { |
| 326 | __show_regs((struct pt_regs *)regs); |
| 327 | } |
| 328 | |
| 329 | void show_registers(struct pt_regs *regs) |
| 330 | { |
| 331 | const int field = 2 * sizeof(unsigned long); |
| 332 | |
| 333 | __show_regs(regs); |
| 334 | print_modules(); |
| 335 | printk("Process %s (pid: %d, threadinfo=%p, task=%p, tls=%0*lx)\n", |
| 336 | current->comm, current->pid, current_thread_info(), current, |
| 337 | field, current_thread_info()->tp_value); |
| 338 | if (cpu_has_userlocal) { |
| 339 | unsigned long tls; |
| 340 | |
| 341 | tls = read_c0_userlocal(); |
| 342 | if (tls != current_thread_info()->tp_value) |
| 343 | printk("*HwTLS: %0*lx\n", field, tls); |
| 344 | } |
| 345 | |
| 346 | show_stacktrace(current, regs); |
| 347 | show_code((unsigned int __user *) regs->cp0_epc); |
| 348 | printk("\n"); |
| 349 | } |
| 350 | |
| 351 | static int regs_to_trapnr(struct pt_regs *regs) |
| 352 | { |
| 353 | return (regs->cp0_cause >> 2) & 0x1f; |
| 354 | } |
| 355 | |
| 356 | static DEFINE_RAW_SPINLOCK(die_lock); |
| 357 | |
| 358 | void __noreturn die(const char *str, struct pt_regs *regs) |
| 359 | { |
| 360 | static int die_counter; |
| 361 | int sig = SIGSEGV; |
| 362 | #ifdef CONFIG_MIPS_MT_SMTC |
| 363 | unsigned long dvpret; |
| 364 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 365 | |
| 366 | oops_enter(); |
| 367 | |
| 368 | if (notify_die(DIE_OOPS, str, regs, 0, regs_to_trapnr(regs), SIGSEGV) == NOTIFY_STOP) |
| 369 | sig = 0; |
| 370 | |
| 371 | console_verbose(); |
| 372 | raw_spin_lock_irq(&die_lock); |
| 373 | #ifdef CONFIG_MIPS_MT_SMTC |
| 374 | dvpret = dvpe(); |
| 375 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 376 | bust_spinlocks(1); |
| 377 | #ifdef CONFIG_MIPS_MT_SMTC |
| 378 | mips_mt_regdump(dvpret); |
| 379 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 380 | |
| 381 | printk("%s[#%d]:\n", str, ++die_counter); |
| 382 | show_registers(regs); |
| 383 | add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE); |
| 384 | raw_spin_unlock_irq(&die_lock); |
| 385 | |
| 386 | oops_exit(); |
| 387 | |
| 388 | if (in_interrupt()) |
| 389 | panic("Fatal exception in interrupt"); |
| 390 | |
| 391 | if (panic_on_oops) { |
| 392 | printk(KERN_EMERG "Fatal exception: panic in 5 seconds"); |
| 393 | ssleep(5); |
| 394 | panic("Fatal exception"); |
| 395 | } |
| 396 | |
| 397 | if (regs && kexec_should_crash(current)) |
| 398 | crash_kexec(regs); |
| 399 | |
| 400 | do_exit(sig); |
| 401 | } |
| 402 | |
| 403 | extern struct exception_table_entry __start___dbe_table[]; |
| 404 | extern struct exception_table_entry __stop___dbe_table[]; |
| 405 | |
| 406 | __asm__( |
| 407 | " .section __dbe_table, \"a\"\n" |
| 408 | " .previous \n"); |
| 409 | |
| 410 | /* Given an address, look for it in the exception tables. */ |
| 411 | static const struct exception_table_entry *search_dbe_tables(unsigned long addr) |
| 412 | { |
| 413 | const struct exception_table_entry *e; |
| 414 | |
| 415 | e = search_extable(__start___dbe_table, __stop___dbe_table - 1, addr); |
| 416 | if (!e) |
| 417 | e = search_module_dbetables(addr); |
| 418 | return e; |
| 419 | } |
| 420 | |
| 421 | asmlinkage void do_be(struct pt_regs *regs) |
| 422 | { |
| 423 | const int field = 2 * sizeof(unsigned long); |
| 424 | const struct exception_table_entry *fixup = NULL; |
| 425 | int data = regs->cp0_cause & 4; |
| 426 | int action = MIPS_BE_FATAL; |
| 427 | enum ctx_state prev_state; |
| 428 | |
| 429 | prev_state = exception_enter(); |
| 430 | /* XXX For now. Fixme, this searches the wrong table ... */ |
| 431 | if (data && !user_mode(regs)) |
| 432 | fixup = search_dbe_tables(exception_epc(regs)); |
| 433 | |
| 434 | if (fixup) |
| 435 | action = MIPS_BE_FIXUP; |
| 436 | |
| 437 | if (board_be_handler) |
| 438 | action = board_be_handler(regs, fixup != NULL); |
| 439 | |
| 440 | switch (action) { |
| 441 | case MIPS_BE_DISCARD: |
| 442 | goto out; |
| 443 | case MIPS_BE_FIXUP: |
| 444 | if (fixup) { |
| 445 | regs->cp0_epc = fixup->nextinsn; |
| 446 | goto out; |
| 447 | } |
| 448 | break; |
| 449 | default: |
| 450 | break; |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * Assume it would be too dangerous to continue ... |
| 455 | */ |
| 456 | printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n", |
| 457 | data ? "Data" : "Instruction", |
| 458 | field, regs->cp0_epc, field, regs->regs[31]); |
| 459 | if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs), SIGBUS) |
| 460 | == NOTIFY_STOP) |
| 461 | goto out; |
| 462 | |
| 463 | die_if_kernel("Oops", regs); |
| 464 | force_sig(SIGBUS, current); |
| 465 | |
| 466 | out: |
| 467 | exception_exit(prev_state); |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * ll/sc, rdhwr, sync emulation |
| 472 | */ |
| 473 | |
| 474 | #define OPCODE 0xfc000000 |
| 475 | #define BASE 0x03e00000 |
| 476 | #define RT 0x001f0000 |
| 477 | #define OFFSET 0x0000ffff |
| 478 | #define LL 0xc0000000 |
| 479 | #define SC 0xe0000000 |
| 480 | #define SPEC0 0x00000000 |
| 481 | #define SPEC3 0x7c000000 |
| 482 | #define RD 0x0000f800 |
| 483 | #define FUNC 0x0000003f |
| 484 | #define SYNC 0x0000000f |
| 485 | #define RDHWR 0x0000003b |
| 486 | |
| 487 | /* microMIPS definitions */ |
| 488 | #define MM_POOL32A_FUNC 0xfc00ffff |
| 489 | #define MM_RDHWR 0x00006b3c |
| 490 | #define MM_RS 0x001f0000 |
| 491 | #define MM_RT 0x03e00000 |
| 492 | |
| 493 | /* |
| 494 | * The ll_bit is cleared by r*_switch.S |
| 495 | */ |
| 496 | |
| 497 | unsigned int ll_bit; |
| 498 | struct task_struct *ll_task; |
| 499 | |
| 500 | static inline int simulate_ll(struct pt_regs *regs, unsigned int opcode) |
| 501 | { |
| 502 | unsigned long value, __user *vaddr; |
| 503 | long offset; |
| 504 | |
| 505 | /* |
| 506 | * analyse the ll instruction that just caused a ri exception |
| 507 | * and put the referenced address to addr. |
| 508 | */ |
| 509 | |
| 510 | /* sign extend offset */ |
| 511 | offset = opcode & OFFSET; |
| 512 | offset <<= 16; |
| 513 | offset >>= 16; |
| 514 | |
| 515 | vaddr = (unsigned long __user *) |
| 516 | ((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset); |
| 517 | |
| 518 | if ((unsigned long)vaddr & 3) |
| 519 | return SIGBUS; |
| 520 | if (get_user(value, vaddr)) |
| 521 | return SIGSEGV; |
| 522 | |
| 523 | preempt_disable(); |
| 524 | |
| 525 | if (ll_task == NULL || ll_task == current) { |
| 526 | ll_bit = 1; |
| 527 | } else { |
| 528 | ll_bit = 0; |
| 529 | } |
| 530 | ll_task = current; |
| 531 | |
| 532 | preempt_enable(); |
| 533 | |
| 534 | regs->regs[(opcode & RT) >> 16] = value; |
| 535 | |
| 536 | return 0; |
| 537 | } |
| 538 | |
| 539 | static inline int simulate_sc(struct pt_regs *regs, unsigned int opcode) |
| 540 | { |
| 541 | unsigned long __user *vaddr; |
| 542 | unsigned long reg; |
| 543 | long offset; |
| 544 | |
| 545 | /* |
| 546 | * analyse the sc instruction that just caused a ri exception |
| 547 | * and put the referenced address to addr. |
| 548 | */ |
| 549 | |
| 550 | /* sign extend offset */ |
| 551 | offset = opcode & OFFSET; |
| 552 | offset <<= 16; |
| 553 | offset >>= 16; |
| 554 | |
| 555 | vaddr = (unsigned long __user *) |
| 556 | ((unsigned long)(regs->regs[(opcode & BASE) >> 21]) + offset); |
| 557 | reg = (opcode & RT) >> 16; |
| 558 | |
| 559 | if ((unsigned long)vaddr & 3) |
| 560 | return SIGBUS; |
| 561 | |
| 562 | preempt_disable(); |
| 563 | |
| 564 | if (ll_bit == 0 || ll_task != current) { |
| 565 | regs->regs[reg] = 0; |
| 566 | preempt_enable(); |
| 567 | return 0; |
| 568 | } |
| 569 | |
| 570 | preempt_enable(); |
| 571 | |
| 572 | if (put_user(regs->regs[reg], vaddr)) |
| 573 | return SIGSEGV; |
| 574 | |
| 575 | regs->regs[reg] = 1; |
| 576 | |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | /* |
| 581 | * ll uses the opcode of lwc0 and sc uses the opcode of swc0. That is both |
| 582 | * opcodes are supposed to result in coprocessor unusable exceptions if |
| 583 | * executed on ll/sc-less processors. That's the theory. In practice a |
| 584 | * few processors such as NEC's VR4100 throw reserved instruction exceptions |
| 585 | * instead, so we're doing the emulation thing in both exception handlers. |
| 586 | */ |
| 587 | static int simulate_llsc(struct pt_regs *regs, unsigned int opcode) |
| 588 | { |
| 589 | if ((opcode & OPCODE) == LL) { |
| 590 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, |
| 591 | 1, regs, 0); |
| 592 | return simulate_ll(regs, opcode); |
| 593 | } |
| 594 | if ((opcode & OPCODE) == SC) { |
| 595 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, |
| 596 | 1, regs, 0); |
| 597 | return simulate_sc(regs, opcode); |
| 598 | } |
| 599 | |
| 600 | return -1; /* Must be something else ... */ |
| 601 | } |
| 602 | |
| 603 | /* |
| 604 | * Simulate trapping 'rdhwr' instructions to provide user accessible |
| 605 | * registers not implemented in hardware. |
| 606 | */ |
| 607 | static int simulate_rdhwr(struct pt_regs *regs, int rd, int rt) |
| 608 | { |
| 609 | struct thread_info *ti = task_thread_info(current); |
| 610 | |
| 611 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, |
| 612 | 1, regs, 0); |
| 613 | switch (rd) { |
| 614 | case 0: /* CPU number */ |
| 615 | regs->regs[rt] = smp_processor_id(); |
| 616 | return 0; |
| 617 | case 1: /* SYNCI length */ |
| 618 | regs->regs[rt] = min(current_cpu_data.dcache.linesz, |
| 619 | current_cpu_data.icache.linesz); |
| 620 | return 0; |
| 621 | case 2: /* Read count register */ |
| 622 | regs->regs[rt] = read_c0_count(); |
| 623 | return 0; |
| 624 | case 3: /* Count register resolution */ |
| 625 | switch (current_cpu_data.cputype) { |
| 626 | case CPU_20KC: |
| 627 | case CPU_25KF: |
| 628 | regs->regs[rt] = 1; |
| 629 | break; |
| 630 | default: |
| 631 | regs->regs[rt] = 2; |
| 632 | } |
| 633 | return 0; |
| 634 | case 29: |
| 635 | regs->regs[rt] = ti->tp_value; |
| 636 | return 0; |
| 637 | default: |
| 638 | return -1; |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | static int simulate_rdhwr_normal(struct pt_regs *regs, unsigned int opcode) |
| 643 | { |
| 644 | if ((opcode & OPCODE) == SPEC3 && (opcode & FUNC) == RDHWR) { |
| 645 | int rd = (opcode & RD) >> 11; |
| 646 | int rt = (opcode & RT) >> 16; |
| 647 | |
| 648 | simulate_rdhwr(regs, rd, rt); |
| 649 | return 0; |
| 650 | } |
| 651 | |
| 652 | /* Not ours. */ |
| 653 | return -1; |
| 654 | } |
| 655 | |
| 656 | static int simulate_rdhwr_mm(struct pt_regs *regs, unsigned short opcode) |
| 657 | { |
| 658 | if ((opcode & MM_POOL32A_FUNC) == MM_RDHWR) { |
| 659 | int rd = (opcode & MM_RS) >> 16; |
| 660 | int rt = (opcode & MM_RT) >> 21; |
| 661 | simulate_rdhwr(regs, rd, rt); |
| 662 | return 0; |
| 663 | } |
| 664 | |
| 665 | /* Not ours. */ |
| 666 | return -1; |
| 667 | } |
| 668 | |
| 669 | static int simulate_sync(struct pt_regs *regs, unsigned int opcode) |
| 670 | { |
| 671 | if ((opcode & OPCODE) == SPEC0 && (opcode & FUNC) == SYNC) { |
| 672 | perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, |
| 673 | 1, regs, 0); |
| 674 | return 0; |
| 675 | } |
| 676 | |
| 677 | return -1; /* Must be something else ... */ |
| 678 | } |
| 679 | |
| 680 | asmlinkage void do_ov(struct pt_regs *regs) |
| 681 | { |
| 682 | enum ctx_state prev_state; |
| 683 | siginfo_t info; |
| 684 | |
| 685 | prev_state = exception_enter(); |
| 686 | die_if_kernel("Integer overflow", regs); |
| 687 | |
| 688 | info.si_code = FPE_INTOVF; |
| 689 | info.si_signo = SIGFPE; |
| 690 | info.si_errno = 0; |
| 691 | info.si_addr = (void __user *) regs->cp0_epc; |
| 692 | force_sig_info(SIGFPE, &info, current); |
| 693 | exception_exit(prev_state); |
| 694 | } |
| 695 | |
| 696 | int process_fpemu_return(int sig, void __user *fault_addr) |
| 697 | { |
| 698 | if (sig == SIGSEGV || sig == SIGBUS) { |
| 699 | struct siginfo si = {0}; |
| 700 | si.si_addr = fault_addr; |
| 701 | si.si_signo = sig; |
| 702 | if (sig == SIGSEGV) { |
| 703 | if (find_vma(current->mm, (unsigned long)fault_addr)) |
| 704 | si.si_code = SEGV_ACCERR; |
| 705 | else |
| 706 | si.si_code = SEGV_MAPERR; |
| 707 | } else { |
| 708 | si.si_code = BUS_ADRERR; |
| 709 | } |
| 710 | force_sig_info(sig, &si, current); |
| 711 | return 1; |
| 712 | } else if (sig) { |
| 713 | force_sig(sig, current); |
| 714 | return 1; |
| 715 | } else { |
| 716 | return 0; |
| 717 | } |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * XXX Delayed fp exceptions when doing a lazy ctx switch XXX |
| 722 | */ |
| 723 | asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31) |
| 724 | { |
| 725 | enum ctx_state prev_state; |
| 726 | siginfo_t info = {0}; |
| 727 | |
| 728 | prev_state = exception_enter(); |
| 729 | if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs), SIGFPE) |
| 730 | == NOTIFY_STOP) |
| 731 | goto out; |
| 732 | die_if_kernel("FP exception in kernel code", regs); |
| 733 | |
| 734 | if (fcr31 & FPU_CSR_UNI_X) { |
| 735 | int sig; |
| 736 | void __user *fault_addr = NULL; |
| 737 | |
| 738 | /* |
| 739 | * Unimplemented operation exception. If we've got the full |
| 740 | * software emulator on-board, let's use it... |
| 741 | * |
| 742 | * Force FPU to dump state into task/thread context. We're |
| 743 | * moving a lot of data here for what is probably a single |
| 744 | * instruction, but the alternative is to pre-decode the FP |
| 745 | * register operands before invoking the emulator, which seems |
| 746 | * a bit extreme for what should be an infrequent event. |
| 747 | */ |
| 748 | /* Ensure 'resume' not overwrite saved fp context again. */ |
| 749 | lose_fpu(1); |
| 750 | |
| 751 | /* Run the emulator */ |
| 752 | sig = fpu_emulator_cop1Handler(regs, ¤t->thread.fpu, 1, |
| 753 | &fault_addr); |
| 754 | |
| 755 | /* |
| 756 | * We can't allow the emulated instruction to leave any of |
| 757 | * the cause bit set in $fcr31. |
| 758 | */ |
| 759 | current->thread.fpu.fcr31 &= ~FPU_CSR_ALL_X; |
| 760 | |
| 761 | /* Restore the hardware register state */ |
| 762 | own_fpu(1); /* Using the FPU again. */ |
| 763 | |
| 764 | /* If something went wrong, signal */ |
| 765 | process_fpemu_return(sig, fault_addr); |
| 766 | |
| 767 | goto out; |
| 768 | } else if (fcr31 & FPU_CSR_INV_X) |
| 769 | info.si_code = FPE_FLTINV; |
| 770 | else if (fcr31 & FPU_CSR_DIV_X) |
| 771 | info.si_code = FPE_FLTDIV; |
| 772 | else if (fcr31 & FPU_CSR_OVF_X) |
| 773 | info.si_code = FPE_FLTOVF; |
| 774 | else if (fcr31 & FPU_CSR_UDF_X) |
| 775 | info.si_code = FPE_FLTUND; |
| 776 | else if (fcr31 & FPU_CSR_INE_X) |
| 777 | info.si_code = FPE_FLTRES; |
| 778 | else |
| 779 | info.si_code = __SI_FAULT; |
| 780 | info.si_signo = SIGFPE; |
| 781 | info.si_errno = 0; |
| 782 | info.si_addr = (void __user *) regs->cp0_epc; |
| 783 | force_sig_info(SIGFPE, &info, current); |
| 784 | |
| 785 | out: |
| 786 | exception_exit(prev_state); |
| 787 | } |
| 788 | |
| 789 | static void do_trap_or_bp(struct pt_regs *regs, unsigned int code, |
| 790 | const char *str) |
| 791 | { |
| 792 | siginfo_t info; |
| 793 | char b[40]; |
| 794 | |
| 795 | #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP |
| 796 | if (kgdb_ll_trap(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) |
| 797 | return; |
| 798 | #endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */ |
| 799 | |
| 800 | if (notify_die(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) |
| 801 | return; |
| 802 | |
| 803 | /* |
| 804 | * A short test says that IRIX 5.3 sends SIGTRAP for all trap |
| 805 | * insns, even for trap and break codes that indicate arithmetic |
| 806 | * failures. Weird ... |
| 807 | * But should we continue the brokenness??? --macro |
| 808 | */ |
| 809 | switch (code) { |
| 810 | case BRK_OVERFLOW: |
| 811 | case BRK_DIVZERO: |
| 812 | scnprintf(b, sizeof(b), "%s instruction in kernel code", str); |
| 813 | die_if_kernel(b, regs); |
| 814 | if (code == BRK_DIVZERO) |
| 815 | info.si_code = FPE_INTDIV; |
| 816 | else |
| 817 | info.si_code = FPE_INTOVF; |
| 818 | info.si_signo = SIGFPE; |
| 819 | info.si_errno = 0; |
| 820 | info.si_addr = (void __user *) regs->cp0_epc; |
| 821 | force_sig_info(SIGFPE, &info, current); |
| 822 | break; |
| 823 | case BRK_BUG: |
| 824 | die_if_kernel("Kernel bug detected", regs); |
| 825 | force_sig(SIGTRAP, current); |
| 826 | break; |
| 827 | case BRK_MEMU: |
| 828 | /* |
| 829 | * Address errors may be deliberately induced by the FPU |
| 830 | * emulator to retake control of the CPU after executing the |
| 831 | * instruction in the delay slot of an emulated branch. |
| 832 | * |
| 833 | * Terminate if exception was recognized as a delay slot return |
| 834 | * otherwise handle as normal. |
| 835 | */ |
| 836 | if (do_dsemulret(regs)) |
| 837 | return; |
| 838 | |
| 839 | die_if_kernel("Math emu break/trap", regs); |
| 840 | force_sig(SIGTRAP, current); |
| 841 | break; |
| 842 | default: |
| 843 | scnprintf(b, sizeof(b), "%s instruction in kernel code", str); |
| 844 | die_if_kernel(b, regs); |
| 845 | force_sig(SIGTRAP, current); |
| 846 | } |
| 847 | } |
| 848 | |
| 849 | asmlinkage void do_bp(struct pt_regs *regs) |
| 850 | { |
| 851 | unsigned int opcode, bcode; |
| 852 | enum ctx_state prev_state; |
| 853 | unsigned long epc; |
| 854 | u16 instr[2]; |
| 855 | |
| 856 | prev_state = exception_enter(); |
| 857 | if (get_isa16_mode(regs->cp0_epc)) { |
| 858 | /* Calculate EPC. */ |
| 859 | epc = exception_epc(regs); |
| 860 | if (cpu_has_mmips) { |
| 861 | if ((__get_user(instr[0], (u16 __user *)msk_isa16_mode(epc)) || |
| 862 | (__get_user(instr[1], (u16 __user *)msk_isa16_mode(epc + 2))))) |
| 863 | goto out_sigsegv; |
| 864 | opcode = (instr[0] << 16) | instr[1]; |
| 865 | } else { |
| 866 | /* MIPS16e mode */ |
| 867 | if (__get_user(instr[0], (u16 __user *)msk_isa16_mode(epc))) |
| 868 | goto out_sigsegv; |
| 869 | bcode = (instr[0] >> 6) & 0x3f; |
| 870 | do_trap_or_bp(regs, bcode, "Break"); |
| 871 | goto out; |
| 872 | } |
| 873 | } else { |
| 874 | if (__get_user(opcode, (unsigned int __user *) exception_epc(regs))) |
| 875 | goto out_sigsegv; |
| 876 | } |
| 877 | |
| 878 | /* |
| 879 | * There is the ancient bug in the MIPS assemblers that the break |
| 880 | * code starts left to bit 16 instead to bit 6 in the opcode. |
| 881 | * Gas is bug-compatible, but not always, grrr... |
| 882 | * We handle both cases with a simple heuristics. --macro |
| 883 | */ |
| 884 | bcode = ((opcode >> 6) & ((1 << 20) - 1)); |
| 885 | if (bcode >= (1 << 10)) |
| 886 | bcode >>= 10; |
| 887 | |
| 888 | /* |
| 889 | * notify the kprobe handlers, if instruction is likely to |
| 890 | * pertain to them. |
| 891 | */ |
| 892 | switch (bcode) { |
| 893 | case BRK_KPROBE_BP: |
| 894 | if (notify_die(DIE_BREAK, "debug", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) |
| 895 | goto out; |
| 896 | else |
| 897 | break; |
| 898 | case BRK_KPROBE_SSTEPBP: |
| 899 | if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP) |
| 900 | goto out; |
| 901 | else |
| 902 | break; |
| 903 | default: |
| 904 | break; |
| 905 | } |
| 906 | |
| 907 | do_trap_or_bp(regs, bcode, "Break"); |
| 908 | |
| 909 | out: |
| 910 | exception_exit(prev_state); |
| 911 | return; |
| 912 | |
| 913 | out_sigsegv: |
| 914 | force_sig(SIGSEGV, current); |
| 915 | goto out; |
| 916 | } |
| 917 | |
| 918 | asmlinkage void do_tr(struct pt_regs *regs) |
| 919 | { |
| 920 | u32 opcode, tcode = 0; |
| 921 | enum ctx_state prev_state; |
| 922 | u16 instr[2]; |
| 923 | unsigned long epc = msk_isa16_mode(exception_epc(regs)); |
| 924 | |
| 925 | prev_state = exception_enter(); |
| 926 | if (get_isa16_mode(regs->cp0_epc)) { |
| 927 | if (__get_user(instr[0], (u16 __user *)(epc + 0)) || |
| 928 | __get_user(instr[1], (u16 __user *)(epc + 2))) |
| 929 | goto out_sigsegv; |
| 930 | opcode = (instr[0] << 16) | instr[1]; |
| 931 | /* Immediate versions don't provide a code. */ |
| 932 | if (!(opcode & OPCODE)) |
| 933 | tcode = (opcode >> 12) & ((1 << 4) - 1); |
| 934 | } else { |
| 935 | if (__get_user(opcode, (u32 __user *)epc)) |
| 936 | goto out_sigsegv; |
| 937 | /* Immediate versions don't provide a code. */ |
| 938 | if (!(opcode & OPCODE)) |
| 939 | tcode = (opcode >> 6) & ((1 << 10) - 1); |
| 940 | } |
| 941 | |
| 942 | do_trap_or_bp(regs, tcode, "Trap"); |
| 943 | |
| 944 | out: |
| 945 | exception_exit(prev_state); |
| 946 | return; |
| 947 | |
| 948 | out_sigsegv: |
| 949 | force_sig(SIGSEGV, current); |
| 950 | goto out; |
| 951 | } |
| 952 | |
| 953 | asmlinkage void do_ri(struct pt_regs *regs) |
| 954 | { |
| 955 | unsigned int __user *epc = (unsigned int __user *)exception_epc(regs); |
| 956 | unsigned long old_epc = regs->cp0_epc; |
| 957 | unsigned long old31 = regs->regs[31]; |
| 958 | enum ctx_state prev_state; |
| 959 | unsigned int opcode = 0; |
| 960 | int status = -1; |
| 961 | |
| 962 | prev_state = exception_enter(); |
| 963 | if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs), SIGILL) |
| 964 | == NOTIFY_STOP) |
| 965 | goto out; |
| 966 | |
| 967 | die_if_kernel("Reserved instruction in kernel code", regs); |
| 968 | |
| 969 | if (unlikely(compute_return_epc(regs) < 0)) |
| 970 | goto out; |
| 971 | |
| 972 | if (get_isa16_mode(regs->cp0_epc)) { |
| 973 | unsigned short mmop[2] = { 0 }; |
| 974 | |
| 975 | if (unlikely(get_user(mmop[0], epc) < 0)) |
| 976 | status = SIGSEGV; |
| 977 | if (unlikely(get_user(mmop[1], epc) < 0)) |
| 978 | status = SIGSEGV; |
| 979 | opcode = (mmop[0] << 16) | mmop[1]; |
| 980 | |
| 981 | if (status < 0) |
| 982 | status = simulate_rdhwr_mm(regs, opcode); |
| 983 | } else { |
| 984 | if (unlikely(get_user(opcode, epc) < 0)) |
| 985 | status = SIGSEGV; |
| 986 | |
| 987 | if (!cpu_has_llsc && status < 0) |
| 988 | status = simulate_llsc(regs, opcode); |
| 989 | |
| 990 | if (status < 0) |
| 991 | status = simulate_rdhwr_normal(regs, opcode); |
| 992 | |
| 993 | if (status < 0) |
| 994 | status = simulate_sync(regs, opcode); |
| 995 | } |
| 996 | |
| 997 | if (status < 0) |
| 998 | status = SIGILL; |
| 999 | |
| 1000 | if (unlikely(status > 0)) { |
| 1001 | regs->cp0_epc = old_epc; /* Undo skip-over. */ |
| 1002 | regs->regs[31] = old31; |
| 1003 | force_sig(status, current); |
| 1004 | } |
| 1005 | |
| 1006 | out: |
| 1007 | exception_exit(prev_state); |
| 1008 | } |
| 1009 | |
| 1010 | /* |
| 1011 | * MIPS MT processors may have fewer FPU contexts than CPU threads. If we've |
| 1012 | * emulated more than some threshold number of instructions, force migration to |
| 1013 | * a "CPU" that has FP support. |
| 1014 | */ |
| 1015 | static void mt_ase_fp_affinity(void) |
| 1016 | { |
| 1017 | #ifdef CONFIG_MIPS_MT_FPAFF |
| 1018 | if (mt_fpemul_threshold > 0 && |
| 1019 | ((current->thread.emulated_fp++ > mt_fpemul_threshold))) { |
| 1020 | /* |
| 1021 | * If there's no FPU present, or if the application has already |
| 1022 | * restricted the allowed set to exclude any CPUs with FPUs, |
| 1023 | * we'll skip the procedure. |
| 1024 | */ |
| 1025 | if (cpus_intersects(current->cpus_allowed, mt_fpu_cpumask)) { |
| 1026 | cpumask_t tmask; |
| 1027 | |
| 1028 | current->thread.user_cpus_allowed |
| 1029 | = current->cpus_allowed; |
| 1030 | cpus_and(tmask, current->cpus_allowed, |
| 1031 | mt_fpu_cpumask); |
| 1032 | set_cpus_allowed_ptr(current, &tmask); |
| 1033 | set_thread_flag(TIF_FPUBOUND); |
| 1034 | } |
| 1035 | } |
| 1036 | #endif /* CONFIG_MIPS_MT_FPAFF */ |
| 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * No lock; only written during early bootup by CPU 0. |
| 1041 | */ |
| 1042 | static RAW_NOTIFIER_HEAD(cu2_chain); |
| 1043 | |
| 1044 | int __ref register_cu2_notifier(struct notifier_block *nb) |
| 1045 | { |
| 1046 | return raw_notifier_chain_register(&cu2_chain, nb); |
| 1047 | } |
| 1048 | |
| 1049 | int cu2_notifier_call_chain(unsigned long val, void *v) |
| 1050 | { |
| 1051 | return raw_notifier_call_chain(&cu2_chain, val, v); |
| 1052 | } |
| 1053 | |
| 1054 | static int default_cu2_call(struct notifier_block *nfb, unsigned long action, |
| 1055 | void *data) |
| 1056 | { |
| 1057 | struct pt_regs *regs = data; |
| 1058 | |
| 1059 | die_if_kernel("COP2: Unhandled kernel unaligned access or invalid " |
| 1060 | "instruction", regs); |
| 1061 | force_sig(SIGILL, current); |
| 1062 | |
| 1063 | return NOTIFY_OK; |
| 1064 | } |
| 1065 | |
| 1066 | asmlinkage void do_cpu(struct pt_regs *regs) |
| 1067 | { |
| 1068 | enum ctx_state prev_state; |
| 1069 | unsigned int __user *epc; |
| 1070 | unsigned long old_epc, old31; |
| 1071 | unsigned int opcode; |
| 1072 | unsigned int cpid; |
| 1073 | int status; |
| 1074 | unsigned long __maybe_unused flags; |
| 1075 | |
| 1076 | prev_state = exception_enter(); |
| 1077 | cpid = (regs->cp0_cause >> CAUSEB_CE) & 3; |
| 1078 | |
| 1079 | if (cpid != 2) |
| 1080 | die_if_kernel("do_cpu invoked from kernel context!", regs); |
| 1081 | |
| 1082 | switch (cpid) { |
| 1083 | case 0: |
| 1084 | epc = (unsigned int __user *)exception_epc(regs); |
| 1085 | old_epc = regs->cp0_epc; |
| 1086 | old31 = regs->regs[31]; |
| 1087 | opcode = 0; |
| 1088 | status = -1; |
| 1089 | |
| 1090 | if (unlikely(compute_return_epc(regs) < 0)) |
| 1091 | goto out; |
| 1092 | |
| 1093 | if (get_isa16_mode(regs->cp0_epc)) { |
| 1094 | unsigned short mmop[2] = { 0 }; |
| 1095 | |
| 1096 | if (unlikely(get_user(mmop[0], epc) < 0)) |
| 1097 | status = SIGSEGV; |
| 1098 | if (unlikely(get_user(mmop[1], epc) < 0)) |
| 1099 | status = SIGSEGV; |
| 1100 | opcode = (mmop[0] << 16) | mmop[1]; |
| 1101 | |
| 1102 | if (status < 0) |
| 1103 | status = simulate_rdhwr_mm(regs, opcode); |
| 1104 | } else { |
| 1105 | if (unlikely(get_user(opcode, epc) < 0)) |
| 1106 | status = SIGSEGV; |
| 1107 | |
| 1108 | if (!cpu_has_llsc && status < 0) |
| 1109 | status = simulate_llsc(regs, opcode); |
| 1110 | |
| 1111 | if (status < 0) |
| 1112 | status = simulate_rdhwr_normal(regs, opcode); |
| 1113 | } |
| 1114 | |
| 1115 | if (status < 0) |
| 1116 | status = SIGILL; |
| 1117 | |
| 1118 | if (unlikely(status > 0)) { |
| 1119 | regs->cp0_epc = old_epc; /* Undo skip-over. */ |
| 1120 | regs->regs[31] = old31; |
| 1121 | force_sig(status, current); |
| 1122 | } |
| 1123 | |
| 1124 | goto out; |
| 1125 | |
| 1126 | case 3: |
| 1127 | /* |
| 1128 | * Old (MIPS I and MIPS II) processors will set this code |
| 1129 | * for COP1X opcode instructions that replaced the original |
| 1130 | * COP3 space. We don't limit COP1 space instructions in |
| 1131 | * the emulator according to the CPU ISA, so we want to |
| 1132 | * treat COP1X instructions consistently regardless of which |
| 1133 | * code the CPU chose. Therefore we redirect this trap to |
| 1134 | * the FP emulator too. |
| 1135 | * |
| 1136 | * Then some newer FPU-less processors use this code |
| 1137 | * erroneously too, so they are covered by this choice |
| 1138 | * as well. |
| 1139 | */ |
| 1140 | if (raw_cpu_has_fpu) |
| 1141 | break; |
| 1142 | /* Fall through. */ |
| 1143 | |
| 1144 | case 1: |
| 1145 | if (used_math()) /* Using the FPU again. */ |
| 1146 | own_fpu(1); |
| 1147 | else { /* First time FPU user. */ |
| 1148 | init_fpu(); |
| 1149 | set_used_math(); |
| 1150 | } |
| 1151 | |
| 1152 | if (!raw_cpu_has_fpu) { |
| 1153 | int sig; |
| 1154 | void __user *fault_addr = NULL; |
| 1155 | sig = fpu_emulator_cop1Handler(regs, |
| 1156 | ¤t->thread.fpu, |
| 1157 | 0, &fault_addr); |
| 1158 | if (!process_fpemu_return(sig, fault_addr)) |
| 1159 | mt_ase_fp_affinity(); |
| 1160 | } |
| 1161 | |
| 1162 | goto out; |
| 1163 | |
| 1164 | case 2: |
| 1165 | raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs); |
| 1166 | goto out; |
| 1167 | } |
| 1168 | |
| 1169 | force_sig(SIGILL, current); |
| 1170 | |
| 1171 | out: |
| 1172 | exception_exit(prev_state); |
| 1173 | } |
| 1174 | |
| 1175 | asmlinkage void do_mdmx(struct pt_regs *regs) |
| 1176 | { |
| 1177 | enum ctx_state prev_state; |
| 1178 | |
| 1179 | prev_state = exception_enter(); |
| 1180 | force_sig(SIGILL, current); |
| 1181 | exception_exit(prev_state); |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * Called with interrupts disabled. |
| 1186 | */ |
| 1187 | asmlinkage void do_watch(struct pt_regs *regs) |
| 1188 | { |
| 1189 | enum ctx_state prev_state; |
| 1190 | u32 cause; |
| 1191 | |
| 1192 | prev_state = exception_enter(); |
| 1193 | /* |
| 1194 | * Clear WP (bit 22) bit of cause register so we don't loop |
| 1195 | * forever. |
| 1196 | */ |
| 1197 | cause = read_c0_cause(); |
| 1198 | cause &= ~(1 << 22); |
| 1199 | write_c0_cause(cause); |
| 1200 | |
| 1201 | /* |
| 1202 | * If the current thread has the watch registers loaded, save |
| 1203 | * their values and send SIGTRAP. Otherwise another thread |
| 1204 | * left the registers set, clear them and continue. |
| 1205 | */ |
| 1206 | if (test_tsk_thread_flag(current, TIF_LOAD_WATCH)) { |
| 1207 | mips_read_watch_registers(); |
| 1208 | local_irq_enable(); |
| 1209 | force_sig(SIGTRAP, current); |
| 1210 | } else { |
| 1211 | mips_clear_watch_registers(); |
| 1212 | local_irq_enable(); |
| 1213 | } |
| 1214 | exception_exit(prev_state); |
| 1215 | } |
| 1216 | |
| 1217 | asmlinkage void do_mcheck(struct pt_regs *regs) |
| 1218 | { |
| 1219 | const int field = 2 * sizeof(unsigned long); |
| 1220 | int multi_match = regs->cp0_status & ST0_TS; |
| 1221 | enum ctx_state prev_state; |
| 1222 | |
| 1223 | prev_state = exception_enter(); |
| 1224 | show_regs(regs); |
| 1225 | |
| 1226 | if (multi_match) { |
| 1227 | printk("Index : %0x\n", read_c0_index()); |
| 1228 | printk("Pagemask: %0x\n", read_c0_pagemask()); |
| 1229 | printk("EntryHi : %0*lx\n", field, read_c0_entryhi()); |
| 1230 | printk("EntryLo0: %0*lx\n", field, read_c0_entrylo0()); |
| 1231 | printk("EntryLo1: %0*lx\n", field, read_c0_entrylo1()); |
| 1232 | printk("\n"); |
| 1233 | dump_tlb_all(); |
| 1234 | } |
| 1235 | |
| 1236 | show_code((unsigned int __user *) regs->cp0_epc); |
| 1237 | |
| 1238 | /* |
| 1239 | * Some chips may have other causes of machine check (e.g. SB1 |
| 1240 | * graduation timer) |
| 1241 | */ |
| 1242 | panic("Caught Machine Check exception - %scaused by multiple " |
| 1243 | "matching entries in the TLB.", |
| 1244 | (multi_match) ? "" : "not "); |
| 1245 | } |
| 1246 | |
| 1247 | asmlinkage void do_mt(struct pt_regs *regs) |
| 1248 | { |
| 1249 | int subcode; |
| 1250 | |
| 1251 | subcode = (read_vpe_c0_vpecontrol() & VPECONTROL_EXCPT) |
| 1252 | >> VPECONTROL_EXCPT_SHIFT; |
| 1253 | switch (subcode) { |
| 1254 | case 0: |
| 1255 | printk(KERN_DEBUG "Thread Underflow\n"); |
| 1256 | break; |
| 1257 | case 1: |
| 1258 | printk(KERN_DEBUG "Thread Overflow\n"); |
| 1259 | break; |
| 1260 | case 2: |
| 1261 | printk(KERN_DEBUG "Invalid YIELD Qualifier\n"); |
| 1262 | break; |
| 1263 | case 3: |
| 1264 | printk(KERN_DEBUG "Gating Storage Exception\n"); |
| 1265 | break; |
| 1266 | case 4: |
| 1267 | printk(KERN_DEBUG "YIELD Scheduler Exception\n"); |
| 1268 | break; |
| 1269 | case 5: |
| 1270 | printk(KERN_DEBUG "Gating Storage Scheduler Exception\n"); |
| 1271 | break; |
| 1272 | default: |
| 1273 | printk(KERN_DEBUG "*** UNKNOWN THREAD EXCEPTION %d ***\n", |
| 1274 | subcode); |
| 1275 | break; |
| 1276 | } |
| 1277 | die_if_kernel("MIPS MT Thread exception in kernel", regs); |
| 1278 | |
| 1279 | force_sig(SIGILL, current); |
| 1280 | } |
| 1281 | |
| 1282 | |
| 1283 | asmlinkage void do_dsp(struct pt_regs *regs) |
| 1284 | { |
| 1285 | if (cpu_has_dsp) |
| 1286 | panic("Unexpected DSP exception"); |
| 1287 | |
| 1288 | force_sig(SIGILL, current); |
| 1289 | } |
| 1290 | |
| 1291 | asmlinkage void do_reserved(struct pt_regs *regs) |
| 1292 | { |
| 1293 | /* |
| 1294 | * Game over - no way to handle this if it ever occurs. Most probably |
| 1295 | * caused by a new unknown cpu type or after another deadly |
| 1296 | * hard/software error. |
| 1297 | */ |
| 1298 | show_regs(regs); |
| 1299 | panic("Caught reserved exception %ld - should not happen.", |
| 1300 | (regs->cp0_cause & 0x7f) >> 2); |
| 1301 | } |
| 1302 | |
| 1303 | static int __initdata l1parity = 1; |
| 1304 | static int __init nol1parity(char *s) |
| 1305 | { |
| 1306 | l1parity = 0; |
| 1307 | return 1; |
| 1308 | } |
| 1309 | __setup("nol1par", nol1parity); |
| 1310 | static int __initdata l2parity = 1; |
| 1311 | static int __init nol2parity(char *s) |
| 1312 | { |
| 1313 | l2parity = 0; |
| 1314 | return 1; |
| 1315 | } |
| 1316 | __setup("nol2par", nol2parity); |
| 1317 | |
| 1318 | /* |
| 1319 | * Some MIPS CPUs can enable/disable for cache parity detection, but do |
| 1320 | * it different ways. |
| 1321 | */ |
| 1322 | static inline void parity_protection_init(void) |
| 1323 | { |
| 1324 | switch (current_cpu_type()) { |
| 1325 | case CPU_24K: |
| 1326 | case CPU_34K: |
| 1327 | case CPU_74K: |
| 1328 | case CPU_1004K: |
| 1329 | { |
| 1330 | #define ERRCTL_PE 0x80000000 |
| 1331 | #define ERRCTL_L2P 0x00800000 |
| 1332 | unsigned long errctl; |
| 1333 | unsigned int l1parity_present, l2parity_present; |
| 1334 | |
| 1335 | errctl = read_c0_ecc(); |
| 1336 | errctl &= ~(ERRCTL_PE|ERRCTL_L2P); |
| 1337 | |
| 1338 | /* probe L1 parity support */ |
| 1339 | write_c0_ecc(errctl | ERRCTL_PE); |
| 1340 | back_to_back_c0_hazard(); |
| 1341 | l1parity_present = (read_c0_ecc() & ERRCTL_PE); |
| 1342 | |
| 1343 | /* probe L2 parity support */ |
| 1344 | write_c0_ecc(errctl|ERRCTL_L2P); |
| 1345 | back_to_back_c0_hazard(); |
| 1346 | l2parity_present = (read_c0_ecc() & ERRCTL_L2P); |
| 1347 | |
| 1348 | if (l1parity_present && l2parity_present) { |
| 1349 | if (l1parity) |
| 1350 | errctl |= ERRCTL_PE; |
| 1351 | if (l1parity ^ l2parity) |
| 1352 | errctl |= ERRCTL_L2P; |
| 1353 | } else if (l1parity_present) { |
| 1354 | if (l1parity) |
| 1355 | errctl |= ERRCTL_PE; |
| 1356 | } else if (l2parity_present) { |
| 1357 | if (l2parity) |
| 1358 | errctl |= ERRCTL_L2P; |
| 1359 | } else { |
| 1360 | /* No parity available */ |
| 1361 | } |
| 1362 | |
| 1363 | printk(KERN_INFO "Writing ErrCtl register=%08lx\n", errctl); |
| 1364 | |
| 1365 | write_c0_ecc(errctl); |
| 1366 | back_to_back_c0_hazard(); |
| 1367 | errctl = read_c0_ecc(); |
| 1368 | printk(KERN_INFO "Readback ErrCtl register=%08lx\n", errctl); |
| 1369 | |
| 1370 | if (l1parity_present) |
| 1371 | printk(KERN_INFO "Cache parity protection %sabled\n", |
| 1372 | (errctl & ERRCTL_PE) ? "en" : "dis"); |
| 1373 | |
| 1374 | if (l2parity_present) { |
| 1375 | if (l1parity_present && l1parity) |
| 1376 | errctl ^= ERRCTL_L2P; |
| 1377 | printk(KERN_INFO "L2 cache parity protection %sabled\n", |
| 1378 | (errctl & ERRCTL_L2P) ? "en" : "dis"); |
| 1379 | } |
| 1380 | } |
| 1381 | break; |
| 1382 | |
| 1383 | case CPU_5KC: |
| 1384 | case CPU_5KE: |
| 1385 | case CPU_LOONGSON1: |
| 1386 | write_c0_ecc(0x80000000); |
| 1387 | back_to_back_c0_hazard(); |
| 1388 | /* Set the PE bit (bit 31) in the c0_errctl register. */ |
| 1389 | printk(KERN_INFO "Cache parity protection %sabled\n", |
| 1390 | (read_c0_ecc() & 0x80000000) ? "en" : "dis"); |
| 1391 | break; |
| 1392 | case CPU_20KC: |
| 1393 | case CPU_25KF: |
| 1394 | /* Clear the DE bit (bit 16) in the c0_status register. */ |
| 1395 | printk(KERN_INFO "Enable cache parity protection for " |
| 1396 | "MIPS 20KC/25KF CPUs.\n"); |
| 1397 | clear_c0_status(ST0_DE); |
| 1398 | break; |
| 1399 | default: |
| 1400 | break; |
| 1401 | } |
| 1402 | } |
| 1403 | |
| 1404 | asmlinkage void cache_parity_error(void) |
| 1405 | { |
| 1406 | const int field = 2 * sizeof(unsigned long); |
| 1407 | unsigned int reg_val; |
| 1408 | |
| 1409 | /* For the moment, report the problem and hang. */ |
| 1410 | printk("Cache error exception:\n"); |
| 1411 | printk("cp0_errorepc == %0*lx\n", field, read_c0_errorepc()); |
| 1412 | reg_val = read_c0_cacheerr(); |
| 1413 | printk("c0_cacheerr == %08x\n", reg_val); |
| 1414 | |
| 1415 | printk("Decoded c0_cacheerr: %s cache fault in %s reference.\n", |
| 1416 | reg_val & (1<<30) ? "secondary" : "primary", |
| 1417 | reg_val & (1<<31) ? "data" : "insn"); |
| 1418 | printk("Error bits: %s%s%s%s%s%s%s\n", |
| 1419 | reg_val & (1<<29) ? "ED " : "", |
| 1420 | reg_val & (1<<28) ? "ET " : "", |
| 1421 | reg_val & (1<<26) ? "EE " : "", |
| 1422 | reg_val & (1<<25) ? "EB " : "", |
| 1423 | reg_val & (1<<24) ? "EI " : "", |
| 1424 | reg_val & (1<<23) ? "E1 " : "", |
| 1425 | reg_val & (1<<22) ? "E0 " : ""); |
| 1426 | printk("IDX: 0x%08x\n", reg_val & ((1<<22)-1)); |
| 1427 | |
| 1428 | #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) |
| 1429 | if (reg_val & (1<<22)) |
| 1430 | printk("DErrAddr0: 0x%0*lx\n", field, read_c0_derraddr0()); |
| 1431 | |
| 1432 | if (reg_val & (1<<23)) |
| 1433 | printk("DErrAddr1: 0x%0*lx\n", field, read_c0_derraddr1()); |
| 1434 | #endif |
| 1435 | |
| 1436 | panic("Can't handle the cache error!"); |
| 1437 | } |
| 1438 | |
| 1439 | /* |
| 1440 | * SDBBP EJTAG debug exception handler. |
| 1441 | * We skip the instruction and return to the next instruction. |
| 1442 | */ |
| 1443 | void ejtag_exception_handler(struct pt_regs *regs) |
| 1444 | { |
| 1445 | const int field = 2 * sizeof(unsigned long); |
| 1446 | unsigned long depc, old_epc, old_ra; |
| 1447 | unsigned int debug; |
| 1448 | |
| 1449 | printk(KERN_DEBUG "SDBBP EJTAG debug exception - not handled yet, just ignored!\n"); |
| 1450 | depc = read_c0_depc(); |
| 1451 | debug = read_c0_debug(); |
| 1452 | printk(KERN_DEBUG "c0_depc = %0*lx, DEBUG = %08x\n", field, depc, debug); |
| 1453 | if (debug & 0x80000000) { |
| 1454 | /* |
| 1455 | * In branch delay slot. |
| 1456 | * We cheat a little bit here and use EPC to calculate the |
| 1457 | * debug return address (DEPC). EPC is restored after the |
| 1458 | * calculation. |
| 1459 | */ |
| 1460 | old_epc = regs->cp0_epc; |
| 1461 | old_ra = regs->regs[31]; |
| 1462 | regs->cp0_epc = depc; |
| 1463 | compute_return_epc(regs); |
| 1464 | depc = regs->cp0_epc; |
| 1465 | regs->cp0_epc = old_epc; |
| 1466 | regs->regs[31] = old_ra; |
| 1467 | } else |
| 1468 | depc += 4; |
| 1469 | write_c0_depc(depc); |
| 1470 | |
| 1471 | #if 0 |
| 1472 | printk(KERN_DEBUG "\n\n----- Enable EJTAG single stepping ----\n\n"); |
| 1473 | write_c0_debug(debug | 0x100); |
| 1474 | #endif |
| 1475 | } |
| 1476 | |
| 1477 | /* |
| 1478 | * NMI exception handler. |
| 1479 | * No lock; only written during early bootup by CPU 0. |
| 1480 | */ |
| 1481 | static RAW_NOTIFIER_HEAD(nmi_chain); |
| 1482 | |
| 1483 | int register_nmi_notifier(struct notifier_block *nb) |
| 1484 | { |
| 1485 | return raw_notifier_chain_register(&nmi_chain, nb); |
| 1486 | } |
| 1487 | |
| 1488 | void __noreturn nmi_exception_handler(struct pt_regs *regs) |
| 1489 | { |
| 1490 | raw_notifier_call_chain(&nmi_chain, 0, regs); |
| 1491 | bust_spinlocks(1); |
| 1492 | printk("NMI taken!!!!\n"); |
| 1493 | die("NMI", regs); |
| 1494 | } |
| 1495 | |
| 1496 | #define VECTORSPACING 0x100 /* for EI/VI mode */ |
| 1497 | |
| 1498 | unsigned long ebase; |
| 1499 | unsigned long exception_handlers[32]; |
| 1500 | unsigned long vi_handlers[64]; |
| 1501 | |
| 1502 | void __init *set_except_vector(int n, void *addr) |
| 1503 | { |
| 1504 | unsigned long handler = (unsigned long) addr; |
| 1505 | unsigned long old_handler; |
| 1506 | |
| 1507 | #ifdef CONFIG_CPU_MICROMIPS |
| 1508 | /* |
| 1509 | * Only the TLB handlers are cache aligned with an even |
| 1510 | * address. All other handlers are on an odd address and |
| 1511 | * require no modification. Otherwise, MIPS32 mode will |
| 1512 | * be entered when handling any TLB exceptions. That |
| 1513 | * would be bad...since we must stay in microMIPS mode. |
| 1514 | */ |
| 1515 | if (!(handler & 0x1)) |
| 1516 | handler |= 1; |
| 1517 | #endif |
| 1518 | old_handler = xchg(&exception_handlers[n], handler); |
| 1519 | |
| 1520 | if (n == 0 && cpu_has_divec) { |
| 1521 | #ifdef CONFIG_CPU_MICROMIPS |
| 1522 | unsigned long jump_mask = ~((1 << 27) - 1); |
| 1523 | #else |
| 1524 | unsigned long jump_mask = ~((1 << 28) - 1); |
| 1525 | #endif |
| 1526 | u32 *buf = (u32 *)(ebase + 0x200); |
| 1527 | unsigned int k0 = 26; |
| 1528 | if ((handler & jump_mask) == ((ebase + 0x200) & jump_mask)) { |
| 1529 | uasm_i_j(&buf, handler & ~jump_mask); |
| 1530 | uasm_i_nop(&buf); |
| 1531 | } else { |
| 1532 | UASM_i_LA(&buf, k0, handler); |
| 1533 | uasm_i_jr(&buf, k0); |
| 1534 | uasm_i_nop(&buf); |
| 1535 | } |
| 1536 | local_flush_icache_range(ebase + 0x200, (unsigned long)buf); |
| 1537 | } |
| 1538 | return (void *)old_handler; |
| 1539 | } |
| 1540 | |
| 1541 | static void do_default_vi(void) |
| 1542 | { |
| 1543 | show_regs(get_irq_regs()); |
| 1544 | panic("Caught unexpected vectored interrupt."); |
| 1545 | } |
| 1546 | |
| 1547 | static void *set_vi_srs_handler(int n, vi_handler_t addr, int srs) |
| 1548 | { |
| 1549 | unsigned long handler; |
| 1550 | unsigned long old_handler = vi_handlers[n]; |
| 1551 | int srssets = current_cpu_data.srsets; |
| 1552 | u16 *h; |
| 1553 | unsigned char *b; |
| 1554 | |
| 1555 | BUG_ON(!cpu_has_veic && !cpu_has_vint); |
| 1556 | BUG_ON((n < 0) && (n > 9)); |
| 1557 | |
| 1558 | if (addr == NULL) { |
| 1559 | handler = (unsigned long) do_default_vi; |
| 1560 | srs = 0; |
| 1561 | } else |
| 1562 | handler = (unsigned long) addr; |
| 1563 | vi_handlers[n] = handler; |
| 1564 | |
| 1565 | b = (unsigned char *)(ebase + 0x200 + n*VECTORSPACING); |
| 1566 | |
| 1567 | if (srs >= srssets) |
| 1568 | panic("Shadow register set %d not supported", srs); |
| 1569 | |
| 1570 | if (cpu_has_veic) { |
| 1571 | if (board_bind_eic_interrupt) |
| 1572 | board_bind_eic_interrupt(n, srs); |
| 1573 | } else if (cpu_has_vint) { |
| 1574 | /* SRSMap is only defined if shadow sets are implemented */ |
| 1575 | if (srssets > 1) |
| 1576 | change_c0_srsmap(0xf << n*4, srs << n*4); |
| 1577 | } |
| 1578 | |
| 1579 | if (srs == 0) { |
| 1580 | /* |
| 1581 | * If no shadow set is selected then use the default handler |
| 1582 | * that does normal register saving and standard interrupt exit |
| 1583 | */ |
| 1584 | extern char except_vec_vi, except_vec_vi_lui; |
| 1585 | extern char except_vec_vi_ori, except_vec_vi_end; |
| 1586 | extern char rollback_except_vec_vi; |
| 1587 | char *vec_start = using_rollback_handler() ? |
| 1588 | &rollback_except_vec_vi : &except_vec_vi; |
| 1589 | #ifdef CONFIG_MIPS_MT_SMTC |
| 1590 | /* |
| 1591 | * We need to provide the SMTC vectored interrupt handler |
| 1592 | * not only with the address of the handler, but with the |
| 1593 | * Status.IM bit to be masked before going there. |
| 1594 | */ |
| 1595 | extern char except_vec_vi_mori; |
| 1596 | #if defined(CONFIG_CPU_MICROMIPS) || defined(CONFIG_CPU_BIG_ENDIAN) |
| 1597 | const int mori_offset = &except_vec_vi_mori - vec_start + 2; |
| 1598 | #else |
| 1599 | const int mori_offset = &except_vec_vi_mori - vec_start; |
| 1600 | #endif |
| 1601 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 1602 | #if defined(CONFIG_CPU_MICROMIPS) || defined(CONFIG_CPU_BIG_ENDIAN) |
| 1603 | const int lui_offset = &except_vec_vi_lui - vec_start + 2; |
| 1604 | const int ori_offset = &except_vec_vi_ori - vec_start + 2; |
| 1605 | #else |
| 1606 | const int lui_offset = &except_vec_vi_lui - vec_start; |
| 1607 | const int ori_offset = &except_vec_vi_ori - vec_start; |
| 1608 | #endif |
| 1609 | const int handler_len = &except_vec_vi_end - vec_start; |
| 1610 | |
| 1611 | if (handler_len > VECTORSPACING) { |
| 1612 | /* |
| 1613 | * Sigh... panicing won't help as the console |
| 1614 | * is probably not configured :( |
| 1615 | */ |
| 1616 | panic("VECTORSPACING too small"); |
| 1617 | } |
| 1618 | |
| 1619 | set_handler(((unsigned long)b - ebase), vec_start, |
| 1620 | #ifdef CONFIG_CPU_MICROMIPS |
| 1621 | (handler_len - 1)); |
| 1622 | #else |
| 1623 | handler_len); |
| 1624 | #endif |
| 1625 | #ifdef CONFIG_MIPS_MT_SMTC |
| 1626 | BUG_ON(n > 7); /* Vector index %d exceeds SMTC maximum. */ |
| 1627 | |
| 1628 | h = (u16 *)(b + mori_offset); |
| 1629 | *h = (0x100 << n); |
| 1630 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 1631 | h = (u16 *)(b + lui_offset); |
| 1632 | *h = (handler >> 16) & 0xffff; |
| 1633 | h = (u16 *)(b + ori_offset); |
| 1634 | *h = (handler & 0xffff); |
| 1635 | local_flush_icache_range((unsigned long)b, |
| 1636 | (unsigned long)(b+handler_len)); |
| 1637 | } |
| 1638 | else { |
| 1639 | /* |
| 1640 | * In other cases jump directly to the interrupt handler. It |
| 1641 | * is the handler's responsibility to save registers if required |
| 1642 | * (eg hi/lo) and return from the exception using "eret". |
| 1643 | */ |
| 1644 | u32 insn; |
| 1645 | |
| 1646 | h = (u16 *)b; |
| 1647 | /* j handler */ |
| 1648 | #ifdef CONFIG_CPU_MICROMIPS |
| 1649 | insn = 0xd4000000 | (((u32)handler & 0x07ffffff) >> 1); |
| 1650 | #else |
| 1651 | insn = 0x08000000 | (((u32)handler & 0x0fffffff) >> 2); |
| 1652 | #endif |
| 1653 | h[0] = (insn >> 16) & 0xffff; |
| 1654 | h[1] = insn & 0xffff; |
| 1655 | h[2] = 0; |
| 1656 | h[3] = 0; |
| 1657 | local_flush_icache_range((unsigned long)b, |
| 1658 | (unsigned long)(b+8)); |
| 1659 | } |
| 1660 | |
| 1661 | return (void *)old_handler; |
| 1662 | } |
| 1663 | |
| 1664 | void *set_vi_handler(int n, vi_handler_t addr) |
| 1665 | { |
| 1666 | return set_vi_srs_handler(n, addr, 0); |
| 1667 | } |
| 1668 | |
| 1669 | extern void tlb_init(void); |
| 1670 | |
| 1671 | /* |
| 1672 | * Timer interrupt |
| 1673 | */ |
| 1674 | int cp0_compare_irq; |
| 1675 | EXPORT_SYMBOL_GPL(cp0_compare_irq); |
| 1676 | int cp0_compare_irq_shift; |
| 1677 | |
| 1678 | /* |
| 1679 | * Performance counter IRQ or -1 if shared with timer |
| 1680 | */ |
| 1681 | int cp0_perfcount_irq; |
| 1682 | EXPORT_SYMBOL_GPL(cp0_perfcount_irq); |
| 1683 | |
| 1684 | static int __cpuinitdata noulri; |
| 1685 | |
| 1686 | static int __init ulri_disable(char *s) |
| 1687 | { |
| 1688 | pr_info("Disabling ulri\n"); |
| 1689 | noulri = 1; |
| 1690 | |
| 1691 | return 1; |
| 1692 | } |
| 1693 | __setup("noulri", ulri_disable); |
| 1694 | |
| 1695 | void __cpuinit per_cpu_trap_init(bool is_boot_cpu) |
| 1696 | { |
| 1697 | unsigned int cpu = smp_processor_id(); |
| 1698 | unsigned int status_set = ST0_CU0; |
| 1699 | unsigned int hwrena = cpu_hwrena_impl_bits; |
| 1700 | #ifdef CONFIG_MIPS_MT_SMTC |
| 1701 | int secondaryTC = 0; |
| 1702 | int bootTC = (cpu == 0); |
| 1703 | |
| 1704 | /* |
| 1705 | * Only do per_cpu_trap_init() for first TC of Each VPE. |
| 1706 | * Note that this hack assumes that the SMTC init code |
| 1707 | * assigns TCs consecutively and in ascending order. |
| 1708 | */ |
| 1709 | |
| 1710 | if (((read_c0_tcbind() & TCBIND_CURTC) != 0) && |
| 1711 | ((read_c0_tcbind() & TCBIND_CURVPE) == cpu_data[cpu - 1].vpe_id)) |
| 1712 | secondaryTC = 1; |
| 1713 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 1714 | |
| 1715 | /* |
| 1716 | * Disable coprocessors and select 32-bit or 64-bit addressing |
| 1717 | * and the 16/32 or 32/32 FPR register model. Reset the BEV |
| 1718 | * flag that some firmware may have left set and the TS bit (for |
| 1719 | * IP27). Set XX for ISA IV code to work. |
| 1720 | */ |
| 1721 | #ifdef CONFIG_64BIT |
| 1722 | status_set |= ST0_FR|ST0_KX|ST0_SX|ST0_UX; |
| 1723 | #endif |
| 1724 | if (current_cpu_data.isa_level & MIPS_CPU_ISA_IV) |
| 1725 | status_set |= ST0_XX; |
| 1726 | if (cpu_has_dsp) |
| 1727 | status_set |= ST0_MX; |
| 1728 | |
| 1729 | change_c0_status(ST0_CU|ST0_MX|ST0_RE|ST0_FR|ST0_BEV|ST0_TS|ST0_KX|ST0_SX|ST0_UX, |
| 1730 | status_set); |
| 1731 | |
| 1732 | if (cpu_has_mips_r2) |
| 1733 | hwrena |= 0x0000000f; |
| 1734 | |
| 1735 | if (!noulri && cpu_has_userlocal) |
| 1736 | hwrena |= (1 << 29); |
| 1737 | |
| 1738 | if (hwrena) |
| 1739 | write_c0_hwrena(hwrena); |
| 1740 | |
| 1741 | #ifdef CONFIG_MIPS_MT_SMTC |
| 1742 | if (!secondaryTC) { |
| 1743 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 1744 | |
| 1745 | if (cpu_has_veic || cpu_has_vint) { |
| 1746 | unsigned long sr = set_c0_status(ST0_BEV); |
| 1747 | write_c0_ebase(ebase); |
| 1748 | write_c0_status(sr); |
| 1749 | /* Setting vector spacing enables EI/VI mode */ |
| 1750 | change_c0_intctl(0x3e0, VECTORSPACING); |
| 1751 | } |
| 1752 | if (cpu_has_divec) { |
| 1753 | if (cpu_has_mipsmt) { |
| 1754 | unsigned int vpflags = dvpe(); |
| 1755 | set_c0_cause(CAUSEF_IV); |
| 1756 | evpe(vpflags); |
| 1757 | } else |
| 1758 | set_c0_cause(CAUSEF_IV); |
| 1759 | } |
| 1760 | |
| 1761 | /* |
| 1762 | * Before R2 both interrupt numbers were fixed to 7, so on R2 only: |
| 1763 | * |
| 1764 | * o read IntCtl.IPTI to determine the timer interrupt |
| 1765 | * o read IntCtl.IPPCI to determine the performance counter interrupt |
| 1766 | */ |
| 1767 | if (cpu_has_mips_r2) { |
| 1768 | cp0_compare_irq_shift = CAUSEB_TI - CAUSEB_IP; |
| 1769 | cp0_compare_irq = (read_c0_intctl() >> INTCTLB_IPTI) & 7; |
| 1770 | cp0_perfcount_irq = (read_c0_intctl() >> INTCTLB_IPPCI) & 7; |
| 1771 | if (cp0_perfcount_irq == cp0_compare_irq) |
| 1772 | cp0_perfcount_irq = -1; |
| 1773 | } else { |
| 1774 | cp0_compare_irq = CP0_LEGACY_COMPARE_IRQ; |
| 1775 | cp0_compare_irq_shift = CP0_LEGACY_PERFCNT_IRQ; |
| 1776 | cp0_perfcount_irq = -1; |
| 1777 | } |
| 1778 | |
| 1779 | #ifdef CONFIG_MIPS_MT_SMTC |
| 1780 | } |
| 1781 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 1782 | |
| 1783 | if (!cpu_data[cpu].asid_cache) |
| 1784 | cpu_data[cpu].asid_cache = ASID_FIRST_VERSION; |
| 1785 | |
| 1786 | atomic_inc(&init_mm.mm_count); |
| 1787 | current->active_mm = &init_mm; |
| 1788 | BUG_ON(current->mm); |
| 1789 | enter_lazy_tlb(&init_mm, current); |
| 1790 | |
| 1791 | #ifdef CONFIG_MIPS_MT_SMTC |
| 1792 | if (bootTC) { |
| 1793 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 1794 | /* Boot CPU's cache setup in setup_arch(). */ |
| 1795 | if (!is_boot_cpu) |
| 1796 | cpu_cache_init(); |
| 1797 | tlb_init(); |
| 1798 | #ifdef CONFIG_MIPS_MT_SMTC |
| 1799 | } else if (!secondaryTC) { |
| 1800 | /* |
| 1801 | * First TC in non-boot VPE must do subset of tlb_init() |
| 1802 | * for MMU countrol registers. |
| 1803 | */ |
| 1804 | write_c0_pagemask(PM_DEFAULT_MASK); |
| 1805 | write_c0_wired(0); |
| 1806 | } |
| 1807 | #endif /* CONFIG_MIPS_MT_SMTC */ |
| 1808 | TLBMISS_HANDLER_SETUP(); |
| 1809 | } |
| 1810 | |
| 1811 | /* Install CPU exception handler */ |
| 1812 | void __cpuinit set_handler(unsigned long offset, void *addr, unsigned long size) |
| 1813 | { |
| 1814 | #ifdef CONFIG_CPU_MICROMIPS |
| 1815 | memcpy((void *)(ebase + offset), ((unsigned char *)addr - 1), size); |
| 1816 | #else |
| 1817 | memcpy((void *)(ebase + offset), addr, size); |
| 1818 | #endif |
| 1819 | local_flush_icache_range(ebase + offset, ebase + offset + size); |
| 1820 | } |
| 1821 | |
| 1822 | static char panic_null_cerr[] __cpuinitdata = |
| 1823 | "Trying to set NULL cache error exception handler"; |
| 1824 | |
| 1825 | /* |
| 1826 | * Install uncached CPU exception handler. |
| 1827 | * This is suitable only for the cache error exception which is the only |
| 1828 | * exception handler that is being run uncached. |
| 1829 | */ |
| 1830 | void __cpuinit set_uncached_handler(unsigned long offset, void *addr, |
| 1831 | unsigned long size) |
| 1832 | { |
| 1833 | unsigned long uncached_ebase = CKSEG1ADDR(ebase); |
| 1834 | |
| 1835 | if (!addr) |
| 1836 | panic(panic_null_cerr); |
| 1837 | |
| 1838 | memcpy((void *)(uncached_ebase + offset), addr, size); |
| 1839 | } |
| 1840 | |
| 1841 | static int __initdata rdhwr_noopt; |
| 1842 | static int __init set_rdhwr_noopt(char *str) |
| 1843 | { |
| 1844 | rdhwr_noopt = 1; |
| 1845 | return 1; |
| 1846 | } |
| 1847 | |
| 1848 | __setup("rdhwr_noopt", set_rdhwr_noopt); |
| 1849 | |
| 1850 | void __init trap_init(void) |
| 1851 | { |
| 1852 | extern char except_vec3_generic; |
| 1853 | extern char except_vec4; |
| 1854 | extern char except_vec3_r4000; |
| 1855 | unsigned long i; |
| 1856 | |
| 1857 | check_wait(); |
| 1858 | |
| 1859 | #if defined(CONFIG_KGDB) |
| 1860 | if (kgdb_early_setup) |
| 1861 | return; /* Already done */ |
| 1862 | #endif |
| 1863 | |
| 1864 | if (cpu_has_veic || cpu_has_vint) { |
| 1865 | unsigned long size = 0x200 + VECTORSPACING*64; |
| 1866 | ebase = (unsigned long) |
| 1867 | __alloc_bootmem(size, 1 << fls(size), 0); |
| 1868 | } else { |
| 1869 | #ifdef CONFIG_KVM_GUEST |
| 1870 | #define KVM_GUEST_KSEG0 0x40000000 |
| 1871 | ebase = KVM_GUEST_KSEG0; |
| 1872 | #else |
| 1873 | ebase = CKSEG0; |
| 1874 | #endif |
| 1875 | if (cpu_has_mips_r2) |
| 1876 | ebase += (read_c0_ebase() & 0x3ffff000); |
| 1877 | } |
| 1878 | |
| 1879 | if (cpu_has_mmips) { |
| 1880 | unsigned int config3 = read_c0_config3(); |
| 1881 | |
| 1882 | if (IS_ENABLED(CONFIG_CPU_MICROMIPS)) |
| 1883 | write_c0_config3(config3 | MIPS_CONF3_ISA_OE); |
| 1884 | else |
| 1885 | write_c0_config3(config3 & ~MIPS_CONF3_ISA_OE); |
| 1886 | } |
| 1887 | |
| 1888 | if (board_ebase_setup) |
| 1889 | board_ebase_setup(); |
| 1890 | per_cpu_trap_init(true); |
| 1891 | |
| 1892 | /* |
| 1893 | * Copy the generic exception handlers to their final destination. |
| 1894 | * This will be overriden later as suitable for a particular |
| 1895 | * configuration. |
| 1896 | */ |
| 1897 | set_handler(0x180, &except_vec3_generic, 0x80); |
| 1898 | |
| 1899 | /* |
| 1900 | * Setup default vectors |
| 1901 | */ |
| 1902 | for (i = 0; i <= 31; i++) |
| 1903 | set_except_vector(i, handle_reserved); |
| 1904 | |
| 1905 | /* |
| 1906 | * Copy the EJTAG debug exception vector handler code to it's final |
| 1907 | * destination. |
| 1908 | */ |
| 1909 | if (cpu_has_ejtag && board_ejtag_handler_setup) |
| 1910 | board_ejtag_handler_setup(); |
| 1911 | |
| 1912 | /* |
| 1913 | * Only some CPUs have the watch exceptions. |
| 1914 | */ |
| 1915 | if (cpu_has_watch) |
| 1916 | set_except_vector(23, handle_watch); |
| 1917 | |
| 1918 | /* |
| 1919 | * Initialise interrupt handlers |
| 1920 | */ |
| 1921 | if (cpu_has_veic || cpu_has_vint) { |
| 1922 | int nvec = cpu_has_veic ? 64 : 8; |
| 1923 | for (i = 0; i < nvec; i++) |
| 1924 | set_vi_handler(i, NULL); |
| 1925 | } |
| 1926 | else if (cpu_has_divec) |
| 1927 | set_handler(0x200, &except_vec4, 0x8); |
| 1928 | |
| 1929 | /* |
| 1930 | * Some CPUs can enable/disable for cache parity detection, but does |
| 1931 | * it different ways. |
| 1932 | */ |
| 1933 | parity_protection_init(); |
| 1934 | |
| 1935 | /* |
| 1936 | * The Data Bus Errors / Instruction Bus Errors are signaled |
| 1937 | * by external hardware. Therefore these two exceptions |
| 1938 | * may have board specific handlers. |
| 1939 | */ |
| 1940 | if (board_be_init) |
| 1941 | board_be_init(); |
| 1942 | |
| 1943 | set_except_vector(0, using_rollback_handler() ? rollback_handle_int |
| 1944 | : handle_int); |
| 1945 | set_except_vector(1, handle_tlbm); |
| 1946 | set_except_vector(2, handle_tlbl); |
| 1947 | set_except_vector(3, handle_tlbs); |
| 1948 | |
| 1949 | set_except_vector(4, handle_adel); |
| 1950 | set_except_vector(5, handle_ades); |
| 1951 | |
| 1952 | set_except_vector(6, handle_ibe); |
| 1953 | set_except_vector(7, handle_dbe); |
| 1954 | |
| 1955 | set_except_vector(8, handle_sys); |
| 1956 | set_except_vector(9, handle_bp); |
| 1957 | set_except_vector(10, rdhwr_noopt ? handle_ri : |
| 1958 | (cpu_has_vtag_icache ? |
| 1959 | handle_ri_rdhwr_vivt : handle_ri_rdhwr)); |
| 1960 | set_except_vector(11, handle_cpu); |
| 1961 | set_except_vector(12, handle_ov); |
| 1962 | set_except_vector(13, handle_tr); |
| 1963 | |
| 1964 | if (current_cpu_type() == CPU_R6000 || |
| 1965 | current_cpu_type() == CPU_R6000A) { |
| 1966 | /* |
| 1967 | * The R6000 is the only R-series CPU that features a machine |
| 1968 | * check exception (similar to the R4000 cache error) and |
| 1969 | * unaligned ldc1/sdc1 exception. The handlers have not been |
| 1970 | * written yet. Well, anyway there is no R6000 machine on the |
| 1971 | * current list of targets for Linux/MIPS. |
| 1972 | * (Duh, crap, there is someone with a triple R6k machine) |
| 1973 | */ |
| 1974 | //set_except_vector(14, handle_mc); |
| 1975 | //set_except_vector(15, handle_ndc); |
| 1976 | } |
| 1977 | |
| 1978 | |
| 1979 | if (board_nmi_handler_setup) |
| 1980 | board_nmi_handler_setup(); |
| 1981 | |
| 1982 | if (cpu_has_fpu && !cpu_has_nofpuex) |
| 1983 | set_except_vector(15, handle_fpe); |
| 1984 | |
| 1985 | set_except_vector(22, handle_mdmx); |
| 1986 | |
| 1987 | if (cpu_has_mcheck) |
| 1988 | set_except_vector(24, handle_mcheck); |
| 1989 | |
| 1990 | if (cpu_has_mipsmt) |
| 1991 | set_except_vector(25, handle_mt); |
| 1992 | |
| 1993 | set_except_vector(26, handle_dsp); |
| 1994 | |
| 1995 | if (board_cache_error_setup) |
| 1996 | board_cache_error_setup(); |
| 1997 | |
| 1998 | if (cpu_has_vce) |
| 1999 | /* Special exception: R4[04]00 uses also the divec space. */ |
| 2000 | set_handler(0x180, &except_vec3_r4000, 0x100); |
| 2001 | else if (cpu_has_4kex) |
| 2002 | set_handler(0x180, &except_vec3_generic, 0x80); |
| 2003 | else |
| 2004 | set_handler(0x080, &except_vec3_generic, 0x80); |
| 2005 | |
| 2006 | local_flush_icache_range(ebase, ebase + 0x400); |
| 2007 | |
| 2008 | sort_extable(__start___dbe_table, __stop___dbe_table); |
| 2009 | |
| 2010 | cu2_notifier(default_cu2_call, 0x80000000); /* Run last */ |
| 2011 | } |