projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
sunrpc: Include missing smp_lock.h
[linux-2.6-block.git] / arch / s390 / kernel / traps.c
CommitLineData
1da177e4
LT		 1/*
2 * arch/s390/kernel/traps.c
3 *
4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
7 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
8 *
9 * Derived from "arch/i386/kernel/traps.c"
10 * Copyright (C) 1991, 1992 Linus Torvalds
11 */
12
13/*
14 * 'Traps.c' handles hardware traps and faults after we have saved some
15 * state in 'asm.s'.
16 */
1da177e4
LT		 17#include <linux/sched.h>
18#include <linux/kernel.h>
19#include <linux/string.h>
20#include <linux/errno.h>
ca633fd0 21#include <linux/tracehook.h>
1da177e4
LT		 22#include <linux/timer.h>
23#include <linux/mm.h>
24#include <linux/smp.h>
1da177e4
LT		 25#include <linux/init.h>
26#include <linux/interrupt.h>
df5f8314 27#include <linux/seq_file.h>
1da177e4
LT		 28#include <linux/delay.h>
29#include <linux/module.h>
1eeb66a1 30#include <linux/kdebug.h>
1da177e4 31#include <linux/kallsyms.h>
5d3f229f 32#include <linux/reboot.h>
4ba069b8 33#include <linux/kprobes.h>
c0007f1a 34#include <linux/bug.h>
5c699714 35#include <linux/utsname.h>
1da177e4
LT		 36#include <asm/system.h>
37#include <asm/uaccess.h>
38#include <asm/io.h>
39#include <asm/atomic.h>
40#include <asm/mathemu.h>
41#include <asm/cpcmd.h>
42#include <asm/s390_ext.h>
43#include <asm/lowcore.h>
44#include <asm/debug.h>
a806170e 45#include "entry.h"
1da177e4 46
1da177e4
LT		 47pgm_check_handler_t *pgm_check_table[128];
48
49#ifdef CONFIG_SYSCTL
50#ifdef CONFIG_PROCESS_DEBUG
51int sysctl_userprocess_debug = 1;
52#else
53int sysctl_userprocess_debug = 0;
54#endif
55#endif
56
57extern pgm_check_handler_t do_protection_exception;
58extern pgm_check_handler_t do_dat_exception;
6252d702 59extern pgm_check_handler_t do_asce_exception;
1da177e4
LT		 60
61#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
62
347a8dc3 63#ifndef CONFIG_64BIT
d7fd5f1e 64#define LONG "%08lx "
1da177e4
LT		 65#define FOURLONG "%08lx %08lx %08lx %08lx\n"
66static int kstack_depth_to_print = 12;
347a8dc3 67#else /* CONFIG_64BIT */
d7fd5f1e 68#define LONG "%016lx "
1da177e4
LT		 69#define FOURLONG "%016lx %016lx %016lx %016lx\n"
70static int kstack_depth_to_print = 20;
347a8dc3 71#endif /* CONFIG_64BIT */
1da177e4
LT		 72
73/*
74 * For show_trace we have tree different stack to consider:
75 * - the panic stack which is used if the kernel stack has overflown
76 * - the asynchronous interrupt stack (cpu related)
77 * - the synchronous kernel stack (process related)
78 * The stack trace can start at any of the three stack and can potentially
79 * touch all of them. The order is: panic stack, async stack, sync stack.
80 */
81static unsigned long
82__show_trace(unsigned long sp, unsigned long low, unsigned long high)
83{
84 struct stack_frame *sf;
85 struct pt_regs *regs;
86
87 while (1) {
88 sp = sp & PSW_ADDR_INSN;
89 if (sp < low || sp > high - sizeof(*sf))
90 return sp;
91 sf = (struct stack_frame *) sp;
92 printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
93 print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
94 /* Follow the backchain. */
95 while (1) {
96 low = sp;
97 sp = sf->back_chain & PSW_ADDR_INSN;
98 if (!sp)
99 break;
100 if (sp <= low || sp > high - sizeof(*sf))
101 return sp;
102 sf = (struct stack_frame *) sp;
103 printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
104 print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
105 }
106 /* Zero backchain detected, check for interrupt frame. */
107 sp = (unsigned long) (sf + 1);
108 if (sp <= low || sp > high - sizeof(*regs))
109 return sp;
110 regs = (struct pt_regs *) sp;
111 printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
112 print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
113 low = sp;
114 sp = regs->gprs[15];
115 }
116}
117
4e83be7b 118static void show_trace(struct task_struct *task, unsigned long *stack)
1da177e4
LT		 119{
120 register unsigned long __r15 asm ("15");
121 unsigned long sp;
122
123 sp = (unsigned long) stack;
124 if (!sp)
125 sp = task ? task->thread.ksp : __r15;
126 printk("Call Trace:\n");
127#ifdef CONFIG_CHECK_STACK
128 sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
129 S390_lowcore.panic_stack);
130#endif
131 sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
132 S390_lowcore.async_stack);
133 if (task)
30af7120
AV		 134 __show_trace(sp, (unsigned long) task_stack_page(task),
135 (unsigned long) task_stack_page(task) + THREAD_SIZE);
1da177e4
LT		 136 else
137 __show_trace(sp, S390_lowcore.thread_info,
138 S390_lowcore.thread_info + THREAD_SIZE);
236257ee
HC		 139 if (!task)
140 task = current;
141 debug_show_held_locks(task);
1da177e4
LT		 142}
143
144void show_stack(struct task_struct *task, unsigned long *sp)
145{
146 register unsigned long * __r15 asm ("15");
147 unsigned long *stack;
148 int i;
149
1da177e4 150 if (!sp)
73805343
HC		 151 stack = task ? (unsigned long *) task->thread.ksp : __r15;
152 else
153 stack = sp;
1da177e4 154
1da177e4
LT		 155 for (i = 0; i < kstack_depth_to_print; i++) {
156 if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
157 break;
158 if (i && ((i * sizeof (long) % 32) == 0))
159 printk("\n ");
d7fd5f1e 160 printk(LONG, *stack++);
1da177e4
LT		 161 }
162 printk("\n");
163 show_trace(task, sp);
164}
165
4e83be7b 166static void show_last_breaking_event(struct pt_regs *regs)
9e74a6b8 167{
4e83be7b 168#ifdef CONFIG_64BIT
9e74a6b8
CB		 169 printk("Last Breaking-Event-Address:\n");
170 printk(" [<%016lx>] ", regs->args[0] & PSW_ADDR_INSN);
171 print_symbol("%s\n", regs->args[0] & PSW_ADDR_INSN);
9e74a6b8 172#endif
4e83be7b 173}
9e74a6b8 174
1da177e4
LT		 175/*
176 * The architecture-independent dump_stack generator
177 */
178void dump_stack(void)
179{
5c699714
HC		 180 printk("CPU: %d %s %s %.*s\n",
181 task_thread_info(current)->cpu, print_tainted(),
182 init_utsname()->release,
183 (int)strcspn(init_utsname()->version, " "),
184 init_utsname()->version);
185 printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
186 current->comm, current->pid, current,
187 (void *) current->thread.ksp);
d2c993d8 188 show_stack(NULL, NULL);
1da177e4 189}
1da177e4
LT		 190EXPORT_SYMBOL(dump_stack);
191
bb11e3bd
MS		 192static inline int mask_bits(struct pt_regs *regs, unsigned long bits)
193{
194 return (regs->psw.mask & bits) / ((~bits + 1) & bits);
195}
196
1da177e4
LT		 197void show_registers(struct pt_regs *regs)
198{
1da177e4 199 char *mode;
1da177e4
LT		 200
201 mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
202 printk("%s PSW : %p %p",
203 mode, (void *) regs->psw.mask,
204 (void *) regs->psw.addr);
205 print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
bb11e3bd
MS		 206 printk(" R:%x T:%x IO:%x EX:%x Key:%x M:%x W:%x "
207 "P:%x AS:%x CC:%x PM:%x", mask_bits(regs, PSW_MASK_PER),
208 mask_bits(regs, PSW_MASK_DAT), mask_bits(regs, PSW_MASK_IO),
209 mask_bits(regs, PSW_MASK_EXT), mask_bits(regs, PSW_MASK_KEY),
210 mask_bits(regs, PSW_MASK_MCHECK), mask_bits(regs, PSW_MASK_WAIT),
211 mask_bits(regs, PSW_MASK_PSTATE), mask_bits(regs, PSW_MASK_ASC),
212 mask_bits(regs, PSW_MASK_CC), mask_bits(regs, PSW_MASK_PM));
213#ifdef CONFIG_64BIT
214 printk(" EA:%x", mask_bits(regs, PSW_BASE_BITS));
215#endif
216 printk("\n%s GPRS: " FOURLONG, mode,
1da177e4
LT		 217 regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
218 printk(" " FOURLONG,
219 regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
220 printk(" " FOURLONG,
221 regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
222 printk(" " FOURLONG,
223 regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
224
bb11e3bd 225 show_code(regs);
1da177e4
LT		 226}
227
4e83be7b
HC		 228void show_regs(struct pt_regs *regs)
229{
230 print_modules();
231 printk("CPU: %d %s %s %.*s\n",
232 task_thread_info(current)->cpu, print_tainted(),
233 init_utsname()->release,
234 (int)strcspn(init_utsname()->version, " "),
235 init_utsname()->version);
236 printk("Process %s (pid: %d, task: %p, ksp: %p)\n",
237 current->comm, current->pid, current,
238 (void *) current->thread.ksp);
239 show_registers(regs);
240 /* Show stack backtrace if pt_regs is from kernel mode */
241 if (!(regs->psw.mask & PSW_MASK_PSTATE))
242 show_trace(NULL, (unsigned long *) regs->gprs[15]);
243 show_last_breaking_event(regs);
244}
245
1da177e4 246/* This is called from fs/proc/array.c */
df5f8314 247void task_show_regs(struct seq_file *m, struct task_struct *task)
1da177e4
LT		 248{
249 struct pt_regs *regs;
250
c7584fb6 251 regs = task_pt_regs(task);
df5f8314 252 seq_printf(m, "task: %p, ksp: %p\n",
1da177e4 253 task, (void *)task->thread.ksp);
df5f8314 254 seq_printf(m, "User PSW : %p %p\n",
1da177e4
LT		 255 (void *) regs->psw.mask, (void *)regs->psw.addr);
256
df5f8314 257 seq_printf(m, "User GPRS: " FOURLONG,
1da177e4
LT		 258 regs->gprs[0], regs->gprs[1],
259 regs->gprs[2], regs->gprs[3]);
df5f8314 260 seq_printf(m, " " FOURLONG,
1da177e4
LT		 261 regs->gprs[4], regs->gprs[5],
262 regs->gprs[6], regs->gprs[7]);
df5f8314 263 seq_printf(m, " " FOURLONG,
1da177e4
LT		 264 regs->gprs[8], regs->gprs[9],
265 regs->gprs[10], regs->gprs[11]);
df5f8314 266 seq_printf(m, " " FOURLONG,
1da177e4
LT		 267 regs->gprs[12], regs->gprs[13],
268 regs->gprs[14], regs->gprs[15]);
df5f8314 269 seq_printf(m, "User ACRS: %08x %08x %08x %08x\n",
1da177e4
LT		 270 task->thread.acrs[0], task->thread.acrs[1],
271 task->thread.acrs[2], task->thread.acrs[3]);
df5f8314 272 seq_printf(m, " %08x %08x %08x %08x\n",
1da177e4
LT		 273 task->thread.acrs[4], task->thread.acrs[5],
274 task->thread.acrs[6], task->thread.acrs[7]);
df5f8314 275 seq_printf(m, " %08x %08x %08x %08x\n",
1da177e4
LT		 276 task->thread.acrs[8], task->thread.acrs[9],
277 task->thread.acrs[10], task->thread.acrs[11]);
df5f8314 278 seq_printf(m, " %08x %08x %08x %08x\n",
1da177e4
LT		 279 task->thread.acrs[12], task->thread.acrs[13],
280 task->thread.acrs[14], task->thread.acrs[15]);
1da177e4
LT		 281}
282
2b67fc46 283static DEFINE_SPINLOCK(die_lock);
1da177e4
LT		 284
285void die(const char * str, struct pt_regs * regs, long err)
286{
287 static int die_counter;
288
bca0fb86 289 oops_enter();
1da177e4
LT		 290 debug_stop_all();
291 console_verbose();
292 spin_lock_irq(&die_lock);
293 bust_spinlocks(1);
5c699714
HC		 294 printk("%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
295#ifdef CONFIG_PREEMPT
296 printk("PREEMPT ");
297#endif
298#ifdef CONFIG_SMP
2485579b
HC		 299 printk("SMP ");
300#endif
301#ifdef CONFIG_DEBUG_PAGEALLOC
302 printk("DEBUG_PAGEALLOC");
5c699714
HC		 303#endif
304 printk("\n");
06770a6e 305 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
bca0fb86 306 show_regs(regs);
1da177e4 307 bust_spinlocks(0);
bcdcd8e7 308 add_taint(TAINT_DIE);
bca0fb86 309 spin_unlock_irq(&die_lock);
1da177e4
LT		 310 if (in_interrupt())
311 panic("Fatal exception in interrupt");
312 if (panic_on_oops)
313 panic("Fatal exception: panic_on_oops");
bca0fb86
HC		 314 oops_exit();
315 do_exit(SIGSEGV);
1da177e4
LT		 316}
317
318static void inline
319report_user_fault(long interruption_code, struct pt_regs *regs)
320{
321#if defined(CONFIG_SYSCTL)
322 if (!sysctl_userprocess_debug)
323 return;
324#endif
325#if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
326 printk("User process fault: interruption code 0x%lX\n",
327 interruption_code);
328 show_regs(regs);
329#endif
330}
331
c0007f1a
HC		 332int is_valid_bugaddr(unsigned long addr)
333{
334 return 1;
335}
336
4ba069b8
MG		 337static void __kprobes inline do_trap(long interruption_code, int signr,
338 char *str, struct pt_regs *regs,
339 siginfo_t *info)
1da177e4
LT		 340{
341 /*
342 * We got all needed information from the lowcore and can
343 * now safely switch on interrupts.
344 */
345 if (regs->psw.mask & PSW_MASK_PSTATE)
346 local_irq_enable();
347
4ba069b8
MG		 348 if (notify_die(DIE_TRAP, str, regs, interruption_code,
349 interruption_code, signr) == NOTIFY_STOP)
350 return;
351
1da177e4
LT		 352 if (regs->psw.mask & PSW_MASK_PSTATE) {
353 struct task_struct *tsk = current;
354
355 tsk->thread.trap_no = interruption_code & 0xffff;
356 force_sig_info(signr, info, tsk);
357 report_user_fault(interruption_code, regs);
358 } else {
359 const struct exception_table_entry *fixup;
360 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
361 if (fixup)
362 regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
c0007f1a
HC		 363 else {
364 enum bug_trap_type btt;
365
608e2619 366 btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
c0007f1a
HC		 367 if (btt == BUG_TRAP_TYPE_WARN)
368 return;
369 die(str, regs, interruption_code);
370 }
1da177e4
LT		 371 }
372}
373
d2c993d8 374static inline void __user *get_check_address(struct pt_regs *regs)
1da177e4 375{
d2c993d8 376 return (void __user *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
1da177e4
LT		 377}
378
4ba069b8 379void __kprobes do_single_step(struct pt_regs *regs)
1da177e4 380{
4ba069b8
MG		 381 if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0,
382 SIGTRAP) == NOTIFY_STOP){
383 return;
384 }
ca633fd0 385 if (tracehook_consider_fatal_signal(current, SIGTRAP))
1da177e4
LT		 386 force_sig(SIGTRAP, current);
387}
388
2b67fc46 389static void default_trap_handler(struct pt_regs * regs, long interruption_code)
1da177e4
LT		 390{
391 if (regs->psw.mask & PSW_MASK_PSTATE) {
392 local_irq_enable();
393 do_exit(SIGSEGV);
394 report_user_fault(interruption_code, regs);
395 } else
396 die("Unknown program exception", regs, interruption_code);
397}
398
399#define DO_ERROR_INFO(signr, str, name, sicode, siaddr) \
2b67fc46 400static void name(struct pt_regs * regs, long interruption_code) \
1da177e4
LT		 401{ \
402 siginfo_t info; \
403 info.si_signo = signr; \
404 info.si_errno = 0; \
405 info.si_code = sicode; \
d2c993d8 406 info.si_addr = siaddr; \
1da177e4
LT		 407 do_trap(interruption_code, signr, str, regs, &info); \
408}
409
410DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
411 ILL_ILLADR, get_check_address(regs))
412DO_ERROR_INFO(SIGILL, "execute exception", execute_exception,
413 ILL_ILLOPN, get_check_address(regs))
414DO_ERROR_INFO(SIGFPE, "fixpoint divide exception", divide_exception,
415 FPE_INTDIV, get_check_address(regs))
416DO_ERROR_INFO(SIGFPE, "fixpoint overflow exception", overflow_exception,
417 FPE_INTOVF, get_check_address(regs))
418DO_ERROR_INFO(SIGFPE, "HFP overflow exception", hfp_overflow_exception,
419 FPE_FLTOVF, get_check_address(regs))
420DO_ERROR_INFO(SIGFPE, "HFP underflow exception", hfp_underflow_exception,
421 FPE_FLTUND, get_check_address(regs))
422DO_ERROR_INFO(SIGFPE, "HFP significance exception", hfp_significance_exception,
423 FPE_FLTRES, get_check_address(regs))
424DO_ERROR_INFO(SIGFPE, "HFP divide exception", hfp_divide_exception,
425 FPE_FLTDIV, get_check_address(regs))
426DO_ERROR_INFO(SIGFPE, "HFP square root exception", hfp_sqrt_exception,
427 FPE_FLTINV, get_check_address(regs))
428DO_ERROR_INFO(SIGILL, "operand exception", operand_exception,
429 ILL_ILLOPN, get_check_address(regs))
430DO_ERROR_INFO(SIGILL, "privileged operation", privileged_op,
431 ILL_PRVOPC, get_check_address(regs))
432DO_ERROR_INFO(SIGILL, "special operation exception", special_op_exception,
433 ILL_ILLOPN, get_check_address(regs))
434DO_ERROR_INFO(SIGILL, "translation exception", translation_exception,
435 ILL_ILLOPN, get_check_address(regs))
436
437static inline void
d2c993d8 438do_fp_trap(struct pt_regs *regs, void __user *location,
1da177e4
LT		 439 int fpc, long interruption_code)
440{
441 siginfo_t si;
442
443 si.si_signo = SIGFPE;
444 si.si_errno = 0;
445 si.si_addr = location;
446 si.si_code = 0;
447 /* FPC[2] is Data Exception Code */
448 if ((fpc & 0x00000300) == 0) {
449 /* bits 6 and 7 of DXC are 0 iff IEEE exception */
450 if (fpc & 0x8000) /* invalid fp operation */
451 si.si_code = FPE_FLTINV;
452 else if (fpc & 0x4000) /* div by 0 */
453 si.si_code = FPE_FLTDIV;
454 else if (fpc & 0x2000) /* overflow */
455 si.si_code = FPE_FLTOVF;
456 else if (fpc & 0x1000) /* underflow */
457 si.si_code = FPE_FLTUND;
458 else if (fpc & 0x0800) /* inexact */
459 si.si_code = FPE_FLTRES;
460 }
461 current->thread.ieee_instruction_pointer = (addr_t) location;
462 do_trap(interruption_code, SIGFPE,
463 "floating point exception", regs, &si);
464}
465
2b67fc46 466static void illegal_op(struct pt_regs * regs, long interruption_code)
1da177e4
LT		 467{
468 siginfo_t info;
469 __u8 opcode[6];
d2c993d8 470 __u16 __user *location;
1da177e4
LT		 471 int signal = 0;
472
d2c993d8 473 location = get_check_address(regs);
1da177e4
LT		 474
475 /*
476 * We got all needed information from the lowcore and can
477 * now safely switch on interrupts.
478 */
479 if (regs->psw.mask & PSW_MASK_PSTATE)
480 local_irq_enable();
481
482 if (regs->psw.mask & PSW_MASK_PSTATE) {
12bae235
HC		 483 if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
484 return;
1da177e4 485 if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
ca633fd0 486 if (tracehook_consider_fatal_signal(current, SIGTRAP))
1da177e4
LT		 487 force_sig(SIGTRAP, current);
488 else
489 signal = SIGILL;
490#ifdef CONFIG_MATHEMU
491 } else if (opcode[0] == 0xb3) {
12bae235
HC		 492 if (get_user(*((__u16 *) (opcode+2)), location+1))
493 return;
1da177e4
LT		 494 signal = math_emu_b3(opcode, regs);
495 } else if (opcode[0] == 0xed) {
12bae235
HC		 496 if (get_user(*((__u32 *) (opcode+2)),
497 (__u32 __user *)(location+1)))
498 return;
1da177e4
LT		 499 signal = math_emu_ed(opcode, regs);
500 } else if (*((__u16 *) opcode) == 0xb299) {
12bae235
HC		 501 if (get_user(*((__u16 *) (opcode+2)), location+1))
502 return;
1da177e4
LT		 503 signal = math_emu_srnm(opcode, regs);
504 } else if (*((__u16 *) opcode) == 0xb29c) {
12bae235
HC		 505 if (get_user(*((__u16 *) (opcode+2)), location+1))
506 return;
1da177e4
LT		 507 signal = math_emu_stfpc(opcode, regs);
508 } else if (*((__u16 *) opcode) == 0xb29d) {
12bae235
HC		 509 if (get_user(*((__u16 *) (opcode+2)), location+1))
510 return;
1da177e4
LT		 511 signal = math_emu_lfpc(opcode, regs);
512#endif
513 } else
514 signal = SIGILL;
35df8d53
HC		 515 } else {
516 /*
517 * If we get an illegal op in kernel mode, send it through the
518 * kprobes notifier. If kprobes doesn't pick it up, SIGILL
519 */
520 if (notify_die(DIE_BPT, "bpt", regs, interruption_code,
521 3, SIGTRAP) != NOTIFY_STOP)
522 signal = SIGILL;
523 }
1da177e4
LT		 524
525#ifdef CONFIG_MATHEMU
526 if (signal == SIGFPE)
527 do_fp_trap(regs, location,
528 current->thread.fp_regs.fpc, interruption_code);
529 else if (signal == SIGSEGV) {
530 info.si_signo = signal;
531 info.si_errno = 0;
532 info.si_code = SEGV_MAPERR;
5a42b81f 533 info.si_addr = (void __user *) location;
1da177e4
LT		 534 do_trap(interruption_code, signal,
535 "user address fault", regs, &info);
536 } else
537#endif
538 if (signal) {
539 info.si_signo = signal;
540 info.si_errno = 0;
541 info.si_code = ILL_ILLOPC;
793af244 542 info.si_addr = (void __user *) location;
1da177e4
LT		 543 do_trap(interruption_code, signal,
544 "illegal operation", regs, &info);
545 }
546}
547
548
549#ifdef CONFIG_MATHEMU
550asmlinkage void
551specification_exception(struct pt_regs * regs, long interruption_code)
552{
553 __u8 opcode[6];
5a42b81f 554 __u16 __user *location = NULL;
1da177e4
LT		 555 int signal = 0;
556
5a42b81f 557 location = (__u16 __user *) get_check_address(regs);
1da177e4
LT		 558
559 /*
560 * We got all needed information from the lowcore and can
561 * now safely switch on interrupts.
562 */
563 if (regs->psw.mask & PSW_MASK_PSTATE)
564 local_irq_enable();
565
566 if (regs->psw.mask & PSW_MASK_PSTATE) {
567 get_user(*((__u16 *) opcode), location);
568 switch (opcode[0]) {
569 case 0x28: /* LDR Rx,Ry */
570 signal = math_emu_ldr(opcode);
571 break;
572 case 0x38: /* LER Rx,Ry */
573 signal = math_emu_ler(opcode);
574 break;
575 case 0x60: /* STD R,D(X,B) */
576 get_user(*((__u16 *) (opcode+2)), location+1);
577 signal = math_emu_std(opcode, regs);
578 break;
579 case 0x68: /* LD R,D(X,B) */
580 get_user(*((__u16 *) (opcode+2)), location+1);
581 signal = math_emu_ld(opcode, regs);
582 break;
583 case 0x70: /* STE R,D(X,B) */
584 get_user(*((__u16 *) (opcode+2)), location+1);
585 signal = math_emu_ste(opcode, regs);
586 break;
587 case 0x78: /* LE R,D(X,B) */
588 get_user(*((__u16 *) (opcode+2)), location+1);
589 signal = math_emu_le(opcode, regs);
590 break;
591 default:
592 signal = SIGILL;
593 break;
594 }
595 } else
596 signal = SIGILL;
597
598 if (signal == SIGFPE)
599 do_fp_trap(regs, location,
600 current->thread.fp_regs.fpc, interruption_code);
601 else if (signal) {
602 siginfo_t info;
603 info.si_signo = signal;
604 info.si_errno = 0;
605 info.si_code = ILL_ILLOPN;
606 info.si_addr = location;
607 do_trap(interruption_code, signal,
608 "specification exception", regs, &info);
609 }
610}
611#else
612DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
613 ILL_ILLOPN, get_check_address(regs));
614#endif
615
2b67fc46 616static void data_exception(struct pt_regs * regs, long interruption_code)
1da177e4 617{
d2c993d8 618 __u16 __user *location;
1da177e4
LT		 619 int signal = 0;
620
d2c993d8 621 location = get_check_address(regs);
1da177e4
LT		 622
623 /*
624 * We got all needed information from the lowcore and can
625 * now safely switch on interrupts.
626 */
627 if (regs->psw.mask & PSW_MASK_PSTATE)
628 local_irq_enable();
629
630 if (MACHINE_HAS_IEEE)
94c12cc7 631 asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
1da177e4
LT		 632
633#ifdef CONFIG_MATHEMU
634 else if (regs->psw.mask & PSW_MASK_PSTATE) {
635 __u8 opcode[6];
636 get_user(*((__u16 *) opcode), location);
637 switch (opcode[0]) {
638 case 0x28: /* LDR Rx,Ry */
639 signal = math_emu_ldr(opcode);
640 break;
641 case 0x38: /* LER Rx,Ry */
642 signal = math_emu_ler(opcode);
643 break;
644 case 0x60: /* STD R,D(X,B) */
645 get_user(*((__u16 *) (opcode+2)), location+1);
646 signal = math_emu_std(opcode, regs);
647 break;
648 case 0x68: /* LD R,D(X,B) */
649 get_user(*((__u16 *) (opcode+2)), location+1);
650 signal = math_emu_ld(opcode, regs);
651 break;
652 case 0x70: /* STE R,D(X,B) */
653 get_user(*((__u16 *) (opcode+2)), location+1);
654 signal = math_emu_ste(opcode, regs);
655 break;
656 case 0x78: /* LE R,D(X,B) */
657 get_user(*((__u16 *) (opcode+2)), location+1);
658 signal = math_emu_le(opcode, regs);
659 break;
660 case 0xb3:
661 get_user(*((__u16 *) (opcode+2)), location+1);
662 signal = math_emu_b3(opcode, regs);
663 break;
664 case 0xed:
665 get_user(*((__u32 *) (opcode+2)),
5a42b81f 666 (__u32 __user *)(location+1));
1da177e4
LT		 667 signal = math_emu_ed(opcode, regs);
668 break;
669 case 0xb2:
670 if (opcode[1] == 0x99) {
671 get_user(*((__u16 *) (opcode+2)), location+1);
672 signal = math_emu_srnm(opcode, regs);
673 } else if (opcode[1] == 0x9c) {
674 get_user(*((__u16 *) (opcode+2)), location+1);
675 signal = math_emu_stfpc(opcode, regs);
676 } else if (opcode[1] == 0x9d) {
677 get_user(*((__u16 *) (opcode+2)), location+1);
678 signal = math_emu_lfpc(opcode, regs);
679 } else
680 signal = SIGILL;
681 break;
682 default:
683 signal = SIGILL;
684 break;
685 }
686 }
687#endif
688 if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
689 signal = SIGFPE;
690 else
691 signal = SIGILL;
692 if (signal == SIGFPE)
693 do_fp_trap(regs, location,
694 current->thread.fp_regs.fpc, interruption_code);
695 else if (signal) {
696 siginfo_t info;
697 info.si_signo = signal;
698 info.si_errno = 0;
699 info.si_code = ILL_ILLOPN;
700 info.si_addr = location;
701 do_trap(interruption_code, signal,
702 "data exception", regs, &info);
703 }
704}
705
2b67fc46 706static void space_switch_exception(struct pt_regs * regs, long int_code)
1da177e4
LT		 707{
708 siginfo_t info;
709
710 /* Set user psw back to home space mode. */
711 if (regs->psw.mask & PSW_MASK_PSTATE)
712 regs->psw.mask |= PSW_ASC_HOME;
713 /* Send SIGILL. */
714 info.si_signo = SIGILL;
715 info.si_errno = 0;
716 info.si_code = ILL_PRVOPC;
717 info.si_addr = get_check_address(regs);
718 do_trap(int_code, SIGILL, "space switch event", regs, &info);
719}
720
721asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
722{
77eb65cb
HC		 723 bust_spinlocks(1);
724 printk("Kernel stack overflow.\n");
725 show_regs(regs);
726 bust_spinlocks(0);
1da177e4
LT		 727 panic("Corrupt kernel stack, can't continue.");
728}
729
1da177e4
LT		 730/* init is done in lowcore.S and head.S */
731
732void __init trap_init(void)
733{
734 int i;
735
736 for (i = 0; i < 128; i++)
737 pgm_check_table[i] = &default_trap_handler;
738 pgm_check_table[1] = &illegal_op;
739 pgm_check_table[2] = &privileged_op;
740 pgm_check_table[3] = &execute_exception;
741 pgm_check_table[4] = &do_protection_exception;
742 pgm_check_table[5] = &addressing_exception;
743 pgm_check_table[6] = &specification_exception;
744 pgm_check_table[7] = &data_exception;
745 pgm_check_table[8] = &overflow_exception;
746 pgm_check_table[9] = &divide_exception;
747 pgm_check_table[0x0A] = &overflow_exception;
748 pgm_check_table[0x0B] = &divide_exception;
749 pgm_check_table[0x0C] = &hfp_overflow_exception;
750 pgm_check_table[0x0D] = &hfp_underflow_exception;
751 pgm_check_table[0x0E] = &hfp_significance_exception;
752 pgm_check_table[0x0F] = &hfp_divide_exception;
753 pgm_check_table[0x10] = &do_dat_exception;
754 pgm_check_table[0x11] = &do_dat_exception;
755 pgm_check_table[0x12] = &translation_exception;
756 pgm_check_table[0x13] = &special_op_exception;
347a8dc3 757#ifdef CONFIG_64BIT
6252d702 758 pgm_check_table[0x38] = &do_asce_exception;
1da177e4
LT		 759 pgm_check_table[0x39] = &do_dat_exception;
760 pgm_check_table[0x3A] = &do_dat_exception;
761 pgm_check_table[0x3B] = &do_dat_exception;
347a8dc3 762#endif /* CONFIG_64BIT */
1da177e4
LT		 763 pgm_check_table[0x15] = &operand_exception;
764 pgm_check_table[0x1C] = &space_switch_exception;
765 pgm_check_table[0x1D] = &hfp_sqrt_exception;
29b08d2b 766 pfault_irq_init();
1da177e4 767}
Linux 6.x block layer and io_uring tree(s)