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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 | /* * arch/s390/kernel/traps.c * * S390 version * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), * * Derived from "arch/i386/kernel/traps.c" * Copyright (C) 1991, 1992 Linus Torvalds */ /* * 'Traps.c' handles hardware traps and faults after we have saved some * state in 'asm.s'. */ #include <linux/config.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/ptrace.h> #include <linux/timer.h> #include <linux/mm.h> #include <linux/smp.h> #include <linux/smp_lock.h> #include <linux/init.h> #include <linux/delay.h> #include <asm/system.h> #include <asm/uaccess.h> #include <asm/io.h> #include <asm/atomic.h> #include <asm/mathemu.h> #if CONFIG_REMOTE_DEBUG #include <asm/gdb-stub.h> #endif #include <asm/cpcmd.h> #include <asm/s390_ext.h> /* Called from entry.S only */ extern void handle_per_exception(struct pt_regs *regs); typedef void pgm_check_handler_t(struct pt_regs *, long); pgm_check_handler_t *pgm_check_table[128]; #ifdef CONFIG_SYSCTL #ifdef CONFIG_PROCESS_DEBUG int sysctl_userprocess_debug = 1; #else int sysctl_userprocess_debug = 0; #endif #endif extern pgm_check_handler_t do_page_fault; extern pgm_check_handler_t do_pseudo_page_fault; #ifdef CONFIG_PFAULT extern int pfault_init(void); extern void pfault_fini(void); extern void pfault_interrupt(struct pt_regs *regs, __u16 error_code); #endif spinlock_t die_lock = SPIN_LOCK_UNLOCKED; void die(const char * str, struct pt_regs * regs, long err) { console_verbose(); spin_lock_irq(&die_lock); bust_spinlocks(1); printk("%s: %04lx\n", str, err & 0xffff); show_regs(regs); bust_spinlocks(0); spin_unlock_irq(&die_lock); do_exit(SIGSEGV); } #define DO_ERROR(signr, str, name) \ asmlinkage void name(struct pt_regs * regs, long interruption_code) \ { \ do_trap(interruption_code, signr, str, regs, NULL); \ } #define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \ asmlinkage void name(struct pt_regs * regs, long interruption_code) \ { \ siginfo_t info; \ info.si_signo = signr; \ info.si_errno = 0; \ info.si_code = sicode; \ info.si_addr = (void *)siaddr; \ do_trap(interruption_code, signr, str, regs, &info); \ } static void inline do_trap(long interruption_code, int signr, char *str, struct pt_regs *regs, siginfo_t *info) { if (regs->psw.mask & PSW_PROBLEM_STATE) { struct task_struct *tsk = current; tsk->thread.trap_no = interruption_code; if (info) force_sig_info(signr, info, tsk); else force_sig(signr, tsk); #ifndef CONFIG_SYSCTL #ifdef CONFIG_PROCESS_DEBUG printk("User process fault: interruption code 0x%lX\n", interruption_code); show_regs(regs); #endif #else if (sysctl_userprocess_debug) { printk("User process fault: interruption code 0x%lX\n", interruption_code); show_regs(regs); } #endif } else { unsigned long fixup = search_exception_table(regs->psw.addr); if (fixup) regs->psw.addr = fixup; else die(str, regs, interruption_code); } } int do_debugger_trap(struct pt_regs *regs,int signal) { if(regs->psw.mask&PSW_PROBLEM_STATE) { if(current->ptrace & PT_PTRACED) force_sig(signal,current); else return 1; } else { #if CONFIG_REMOTE_DEBUG if(gdb_stub_initialised) { gdb_stub_handle_exception((struct gdb_pt_regs *)regs,signal); return 0; } #endif return 1; } return 0; } DO_ERROR(SIGSEGV, "Unknown program exception", default_trap_handler) DO_ERROR(SIGILL, "privileged operation", privileged_op) DO_ERROR(SIGILL, "execute exception", execute_exception) DO_ERROR(SIGSEGV, "addressing exception", addressing_exception) DO_ERROR(SIGFPE, "fixpoint divide exception", divide_exception) DO_ERROR(SIGILL, "translation exception", translation_exception) DO_ERROR(SIGILL, "special operand exception", special_op_exception) DO_ERROR(SIGILL, "operand exception", operand_exception) asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code) { __u8 opcode[6]; __u16 *location; int signal = 0; int problem_state=(regs->psw.mask & PSW_PROBLEM_STATE); location = (__u16 *)(regs->psw.addr-S390_lowcore.pgm_ilc); if(problem_state) get_user(*((__u16 *) opcode), location); else *((__u16 *)opcode)=*((__u16 *)location); if(*((__u16 *)opcode)==S390_BREAKPOINT_U16) { if(do_debugger_trap(regs,SIGTRAP)) signal = SIGILL; } #ifdef CONFIG_MATHEMU else if (problem_state) { if (opcode[0] == 0xb3) { get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_b3(opcode, regs); } else if (opcode[0] == 0xed) { get_user(*((__u32 *) (opcode+2)), (__u32 *)(location+1)); signal = math_emu_ed(opcode, regs); } else if (*((__u16 *) opcode) == 0xb299) { get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_srnm(opcode, regs); } else if (*((__u16 *) opcode) == 0xb29c) { get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_stfpc(opcode, regs); } else if (*((__u16 *) opcode) == 0xb29d) { get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_lfpc(opcode, regs); } else signal = SIGILL; } #endif else signal = SIGILL; if (signal == SIGFPE) { current->thread.ieee_instruction_pointer = (addr_t) location; do_trap(interruption_code, signal, "floating point exception", regs, NULL); } else if (signal) do_trap(interruption_code, signal, "illegal operation", regs, NULL); } #ifdef CONFIG_MATHEMU asmlinkage void specification_exception(struct pt_regs * regs, long interruption_code) { __u8 opcode[6]; __u16 *location = NULL; int signal = 0; if (regs->psw.mask & PSW_PROBLEM_STATE) { location = (__u16 *)(regs->psw.addr-S390_lowcore.pgm_ilc); get_user(*((__u16 *) opcode), location); switch (opcode[0]) { case 0x28: /* LDR Rx,Ry */ signal = math_emu_ldr(opcode); break; case 0x38: /* LER Rx,Ry */ signal = math_emu_ler(opcode); break; case 0x60: /* STD R,D(X,B) */ get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_std(opcode, regs); break; case 0x68: /* LD R,D(X,B) */ get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_ld(opcode, regs); break; case 0x70: /* STE R,D(X,B) */ get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_ste(opcode, regs); break; case 0x78: /* LE R,D(X,B) */ get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_le(opcode, regs); break; default: signal = SIGILL; break; } } else signal = SIGILL; if (signal == SIGFPE) { current->thread.ieee_instruction_pointer = (addr_t) location; do_trap(interruption_code, signal, "floating point exception", regs, NULL); } else if (signal) do_trap(interruption_code, signal, "specification exception", regs, NULL); } #else DO_ERROR(SIGILL, "specification exception", specification_exception) #endif asmlinkage void data_exception(struct pt_regs * regs, long interruption_code) { __u8 opcode[6]; __u16 *location; int signal = 0; location = (__u16 *)(regs->psw.addr-S390_lowcore.pgm_ilc); if (MACHINE_HAS_IEEE) __asm__ volatile ("stfpc %0\n\t" : "=m" (current->thread.fp_regs.fpc)); #ifdef CONFIG_MATHEMU else if (regs->psw.mask & PSW_PROBLEM_STATE) { get_user(*((__u16 *) opcode), location); switch (opcode[0]) { case 0x28: /* LDR Rx,Ry */ signal = math_emu_ldr(opcode); break; case 0x38: /* LER Rx,Ry */ signal = math_emu_ler(opcode); break; case 0x60: /* STD R,D(X,B) */ get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_std(opcode, regs); break; case 0x68: /* LD R,D(X,B) */ get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_ld(opcode, regs); break; case 0x70: /* STE R,D(X,B) */ get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_ste(opcode, regs); break; case 0x78: /* LE R,D(X,B) */ get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_le(opcode, regs); break; case 0xb3: get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_b3(opcode, regs); break; case 0xed: get_user(*((__u32 *) (opcode+2)), (__u32 *)(location+1)); signal = math_emu_ed(opcode, regs); break; case 0xb2: if (opcode[1] == 0x99) { get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_srnm(opcode, regs); } else if (opcode[1] == 0x9c) { get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_stfpc(opcode, regs); } else if (opcode[1] == 0x9d) { get_user(*((__u16 *) (opcode+2)), location+1); signal = math_emu_lfpc(opcode, regs); } else signal = SIGILL; break; default: signal = SIGILL; break; } } #endif if (current->thread.fp_regs.fpc & FPC_DXC_MASK) signal = SIGFPE; else signal = SIGILL; if (signal == SIGFPE) { current->thread.ieee_instruction_pointer = (addr_t) location; do_trap(interruption_code, signal, "floating point exception", regs, NULL); } else if (signal) do_trap(interruption_code, signal, "data exception", regs, NULL); } /* init is done in lowcore.S and head.S */ void __init trap_init(void) { int i; for (i = 0; i < 128; i++) pgm_check_table[i] = &default_trap_handler; pgm_check_table[1] = &illegal_op; pgm_check_table[2] = &privileged_op; pgm_check_table[3] = &execute_exception; pgm_check_table[4] = &do_page_fault; pgm_check_table[5] = &addressing_exception; pgm_check_table[6] = &specification_exception; pgm_check_table[7] = &data_exception; pgm_check_table[9] = ÷_exception; pgm_check_table[0x10] = &do_page_fault; pgm_check_table[0x11] = &do_page_fault; pgm_check_table[0x12] = &translation_exception; pgm_check_table[0x13] = &special_op_exception; pgm_check_table[0x14] = &do_pseudo_page_fault; pgm_check_table[0x15] = &operand_exception; pgm_check_table[0x1C] = &privileged_op; #ifdef CONFIG_PFAULT if (MACHINE_IS_VM) { /* request the 0x2603 external interrupt */ if (register_external_interrupt(0x2603, pfault_interrupt) != 0) panic("Couldn't request external interrupt 0x2603"); /* * First try to get pfault pseudo page faults going. * If this isn't available turn on pagex page faults. */ if (pfault_init() != 0) { /* Tough luck, no pfault. */ unregister_external_interrupt(0x2603, pfault_interrupt); cpcmd("SET PAGEX ON", NULL, 0); } } #else if (MACHINE_IS_VM) cpcmd("SET PAGEX ON", NULL, 0); #endif } void handle_per_exception(struct pt_regs *regs) { if(regs->psw.mask&PSW_PROBLEM_STATE) { per_struct *per_info=¤t->thread.per_info; per_info->lowcore.words.perc_atmid=S390_lowcore.per_perc_atmid; per_info->lowcore.words.address=S390_lowcore.per_address; per_info->lowcore.words.access_id=S390_lowcore.per_access_id; } if(do_debugger_trap(regs,SIGTRAP)) { /* I've seen this possibly a task structure being reused ? */ printk("Spurious per exception detected\n"); printk("switching off per tracing for this task.\n"); show_regs(regs); /* Hopefully switching off per tracing will help us survive */ regs->psw.mask &= ~PSW_PER_MASK; } } |