1 files changed, 174 insertions, 516 deletions

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 5d21e9e6e7b..c5762324d9e 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -1,8 +1,6 @@
 /*
- *  arch/s390/kernel/traps.c
- *
  *  S390 version
- *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Copyright IBM Corp. 1999, 2000
  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
  *               Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
  *
@@ -14,503 +12,245 @@
  * '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/kprobes.h>
+#include <linux/kdebug.h>
+#include <linux/module.h>
 #include <linux/ptrace.h>
-#include <linux/timer.h>
+#include <linux/sched.h>
 #include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/smp_lock.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/reboot.h>
-
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/io.h>
-#include <asm/atomic.h>
-#include <asm/mathemu.h>
-#include <asm/cpcmd.h>
-#include <asm/s390_ext.h>
-#include <asm/lowcore.h>
-#include <asm/debug.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_protection_exception;
-extern pgm_check_handler_t do_dat_exception;
-#ifdef CONFIG_PFAULT
-extern int pfault_init(void);
-extern void pfault_fini(void);
-extern void pfault_interrupt(struct pt_regs *regs, __u16 error_code);
-static ext_int_info_t ext_int_pfault;
-#endif
-extern pgm_check_handler_t do_monitor_call;
-
-#define stack_pointer ({ void **sp; asm("la %0,0(15)" : "=&d" (sp)); sp; })
+#include "entry.h"
 
-#ifndef CONFIG_64BIT
-#define FOURLONG "%08lx %08lx %08lx %08lx\n"
-static int kstack_depth_to_print = 12;
-#else /* CONFIG_64BIT */
-#define FOURLONG "%016lx %016lx %016lx %016lx\n"
-static int kstack_depth_to_print = 20;
-#endif /* CONFIG_64BIT */
+int show_unhandled_signals = 1;
 
-/*
- * For show_trace we have tree different stack to consider:
- *   - the panic stack which is used if the kernel stack has overflown
- *   - the asynchronous interrupt stack (cpu related)
- *   - the synchronous kernel stack (process related)
- * The stack trace can start at any of the three stack and can potentially
- * touch all of them. The order is: panic stack, async stack, sync stack.
- */
-static unsigned long
-__show_trace(unsigned long sp, unsigned long low, unsigned long high)
+static inline void __user *get_trap_ip(struct pt_regs *regs)
 {
-	struct stack_frame *sf;
-	struct pt_regs *regs;
-
-	while (1) {
-		sp = sp & PSW_ADDR_INSN;
-		if (sp < low || sp > high - sizeof(*sf))
-			return sp;
-		sf = (struct stack_frame *) sp;
-		printk("([<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
-		print_symbol("%s)\n", sf->gprs[8] & PSW_ADDR_INSN);
-		/* Follow the backchain. */
-		while (1) {
-			low = sp;
-			sp = sf->back_chain & PSW_ADDR_INSN;
-			if (!sp)
-				break;
-			if (sp <= low || sp > high - sizeof(*sf))
-				return sp;
-			sf = (struct stack_frame *) sp;
-			printk(" [<%016lx>] ", sf->gprs[8] & PSW_ADDR_INSN);
-			print_symbol("%s\n", sf->gprs[8] & PSW_ADDR_INSN);
-		}
-		/* Zero backchain detected, check for interrupt frame. */
-		sp = (unsigned long) (sf + 1);
-		if (sp <= low || sp > high - sizeof(*regs))
-			return sp;
-		regs = (struct pt_regs *) sp;
-		printk(" [<%016lx>] ", regs->psw.addr & PSW_ADDR_INSN);
-		print_symbol("%s\n", regs->psw.addr & PSW_ADDR_INSN);
-		low = sp;
-		sp = regs->gprs[15];
-	}
-}
+#ifdef CONFIG_64BIT
+	unsigned long address;
 
-void show_trace(struct task_struct *task, unsigned long * stack)
-{
-	register unsigned long __r15 asm ("15");
-	unsigned long sp;
-
-	sp = (unsigned long) stack;
-	if (!sp)
-		sp = task ? task->thread.ksp : __r15;
-	printk("Call Trace:\n");
-#ifdef CONFIG_CHECK_STACK
-	sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
-			  S390_lowcore.panic_stack);
-#endif
-	sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
-			  S390_lowcore.async_stack);
-	if (task)
-		__show_trace(sp, (unsigned long) task_stack_page(task),
-			     (unsigned long) task_stack_page(task) + THREAD_SIZE);
+	if (regs->int_code & 0x200)
+		address = *(unsigned long *)(current->thread.trap_tdb + 24);
 	else
-		__show_trace(sp, S390_lowcore.thread_info,
-			     S390_lowcore.thread_info + THREAD_SIZE);
-	printk("\n");
+		address = regs->psw.addr;
+	return (void __user *)
+		((address - (regs->int_code >> 16)) & PSW_ADDR_INSN);
+#else
+	return (void __user *)
+		((regs->psw.addr - (regs->int_code >> 16)) & PSW_ADDR_INSN);
+#endif
 }
 
-void show_stack(struct task_struct *task, unsigned long *sp)
+static inline void report_user_fault(struct pt_regs *regs, int signr)
 {
-	register unsigned long * __r15 asm ("15");
-	unsigned long *stack;
-	int i;
-
-	// debugging aid: "show_stack(NULL);" prints the
-	// back trace for this cpu.
-
-	if (!sp)
-		sp = task ? (unsigned long *) task->thread.ksp : __r15;
-
-	stack = sp;
-	for (i = 0; i < kstack_depth_to_print; i++) {
-		if (((addr_t) stack & (THREAD_SIZE-1)) == 0)
-			break;
-		if (i && ((i * sizeof (long) % 32) == 0))
-			printk("\n       ");
-		printk("%p ", (void *)*stack++);
-	}
+	if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
+		return;
+	if (!unhandled_signal(current, signr))
+		return;
+	if (!printk_ratelimit())
+		return;
+	printk("User process fault: interruption code 0x%X ", regs->int_code);
+	print_vma_addr("in ", regs->psw.addr & PSW_ADDR_INSN);
 	printk("\n");
-	show_trace(task, sp);
-}
-
-/*
- * The architecture-independent dump_stack generator
- */
-void dump_stack(void)
-{
-	show_stack(0, 0);
+	show_regs(regs);
 }
 
-EXPORT_SYMBOL(dump_stack);
-
-void show_registers(struct pt_regs *regs)
-{
-	mm_segment_t old_fs;
-	char *mode;
-	int i;
-
-	mode = (regs->psw.mask & PSW_MASK_PSTATE) ? "User" : "Krnl";
-	printk("%s PSW : %p %p",
-	       mode, (void *) regs->psw.mask,
-	       (void *) regs->psw.addr);
-	print_symbol(" (%s)\n", regs->psw.addr & PSW_ADDR_INSN);
-	printk("%s GPRS: " FOURLONG, mode,
-	       regs->gprs[0], regs->gprs[1], regs->gprs[2], regs->gprs[3]);
-	printk("           " FOURLONG,
-	       regs->gprs[4], regs->gprs[5], regs->gprs[6], regs->gprs[7]);
-	printk("           " FOURLONG,
-	       regs->gprs[8], regs->gprs[9], regs->gprs[10], regs->gprs[11]);
-	printk("           " FOURLONG,
-	       regs->gprs[12], regs->gprs[13], regs->gprs[14], regs->gprs[15]);
-
-#if 0
-	/* FIXME: this isn't needed any more but it changes the ksymoops
-	 * input. To remove or not to remove ... */
-	save_access_regs(regs->acrs);
-	printk("%s ACRS: %08x %08x %08x %08x\n", mode,
-	       regs->acrs[0], regs->acrs[1], regs->acrs[2], regs->acrs[3]);
-	printk("           %08x %08x %08x %08x\n",
-	       regs->acrs[4], regs->acrs[5], regs->acrs[6], regs->acrs[7]);
-	printk("           %08x %08x %08x %08x\n",
-	       regs->acrs[8], regs->acrs[9], regs->acrs[10], regs->acrs[11]);
-	printk("           %08x %08x %08x %08x\n",
-	       regs->acrs[12], regs->acrs[13], regs->acrs[14], regs->acrs[15]);
-#endif
-
-	/*
-	 * Print the first 20 byte of the instruction stream at the
-	 * time of the fault.
-	 */
-	old_fs = get_fs();
-	if (regs->psw.mask & PSW_MASK_PSTATE)
-		set_fs(USER_DS);
-	else
-		set_fs(KERNEL_DS);
-	printk("%s Code: ", mode);
-	for (i = 0; i < 20; i++) {
-		unsigned char c;
-		if (__get_user(c, (char __user *)(regs->psw.addr + i))) {
-			printk(" Bad PSW.");
-			break;
-		}
-		printk("%02x ", c);
-	}
-	set_fs(old_fs);
-
-	printk("\n");
-}	
-
-/* This is called from fs/proc/array.c */
-char *task_show_regs(struct task_struct *task, char *buffer)
+int is_valid_bugaddr(unsigned long addr)
 {
-	struct pt_regs *regs;
-
-	regs = task_pt_regs(task);
-	buffer += sprintf(buffer, "task: %p, ksp: %p\n",
-		       task, (void *)task->thread.ksp);
-	buffer += sprintf(buffer, "User PSW : %p %p\n",
-		       (void *) regs->psw.mask, (void *)regs->psw.addr);
-
-	buffer += sprintf(buffer, "User GPRS: " FOURLONG,
-			  regs->gprs[0], regs->gprs[1],
-			  regs->gprs[2], regs->gprs[3]);
-	buffer += sprintf(buffer, "           " FOURLONG,
-			  regs->gprs[4], regs->gprs[5],
-			  regs->gprs[6], regs->gprs[7]);
-	buffer += sprintf(buffer, "           " FOURLONG,
-			  regs->gprs[8], regs->gprs[9],
-			  regs->gprs[10], regs->gprs[11]);
-	buffer += sprintf(buffer, "           " FOURLONG,
-			  regs->gprs[12], regs->gprs[13],
-			  regs->gprs[14], regs->gprs[15]);
-	buffer += sprintf(buffer, "User ACRS: %08x %08x %08x %08x\n",
-			  task->thread.acrs[0], task->thread.acrs[1],
-			  task->thread.acrs[2], task->thread.acrs[3]);
-	buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
-			  task->thread.acrs[4], task->thread.acrs[5],
-			  task->thread.acrs[6], task->thread.acrs[7]);
-	buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
-			  task->thread.acrs[8], task->thread.acrs[9],
-			  task->thread.acrs[10], task->thread.acrs[11]);
-	buffer += sprintf(buffer, "           %08x %08x %08x %08x\n",
-			  task->thread.acrs[12], task->thread.acrs[13],
-			  task->thread.acrs[14], task->thread.acrs[15]);
-	return buffer;
+	return 1;
 }
 
-DEFINE_SPINLOCK(die_lock);
-
-void die(const char * str, struct pt_regs * regs, long err)
+static void __kprobes do_trap(struct pt_regs *regs,
+			      int si_signo, int si_code, char *str)
 {
-	static int die_counter;
-
-	debug_stop_all();
-	console_verbose();
-	spin_lock_irq(&die_lock);
-	bust_spinlocks(1);
-	printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
-        show_regs(regs);
-	bust_spinlocks(0);
-        spin_unlock_irq(&die_lock);
-	if (in_interrupt())
-		panic("Fatal exception in interrupt");
-	if (panic_on_oops)
-		panic("Fatal exception: panic_on_oops");
-        do_exit(SIGSEGV);
-}
+	siginfo_t info;
 
-static void inline
-report_user_fault(long interruption_code, struct pt_regs *regs)
-{
-#if defined(CONFIG_SYSCTL)
-	if (!sysctl_userprocess_debug)
+	if (notify_die(DIE_TRAP, str, regs, 0,
+		       regs->int_code, si_signo) == NOTIFY_STOP)
 		return;
-#endif
-#if defined(CONFIG_SYSCTL) || defined(CONFIG_PROCESS_DEBUG)
-	printk("User process fault: interruption code 0x%lX\n",
-	       interruption_code);
-	show_regs(regs);
-#endif
-}
 
-static void inline do_trap(long interruption_code, int signr, char *str,
-                           struct pt_regs *regs, siginfo_t *info)
-{
-	/*
-	 * We got all needed information from the lowcore and can
-	 * now safely switch on interrupts.
-	 */
-        if (regs->psw.mask & PSW_MASK_PSTATE)
-		local_irq_enable();
-
-        if (regs->psw.mask & PSW_MASK_PSTATE) {
-                struct task_struct *tsk = current;
-
-                tsk->thread.trap_no = interruption_code & 0xffff;
-		force_sig_info(signr, info, tsk);
-		report_user_fault(interruption_code, regs);
+	if (user_mode(regs)) {
+		info.si_signo = si_signo;
+		info.si_errno = 0;
+		info.si_code = si_code;
+		info.si_addr = get_trap_ip(regs);
+		force_sig_info(si_signo, &info, current);
+		report_user_fault(regs, si_signo);
         } else {
                 const struct exception_table_entry *fixup;
                 fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
                 if (fixup)
-                        regs->psw.addr = fixup->fixup | PSW_ADDR_AMODE;
-                else
-                        die(str, regs, interruption_code);
+			regs->psw.addr = extable_fixup(fixup) | PSW_ADDR_AMODE;
+		else {
+			enum bug_trap_type btt;
+
+			btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
+			if (btt == BUG_TRAP_TYPE_WARN)
+				return;
+			die(regs, str);
+		}
         }
 }
 
-static inline void *get_check_address(struct pt_regs *regs)
+void __kprobes do_per_trap(struct pt_regs *regs)
 {
-	return (void *)((regs->psw.addr-S390_lowcore.pgm_ilc) & PSW_ADDR_INSN);
-}
+	siginfo_t info;
 
-void do_single_step(struct pt_regs *regs)
-{
-	if ((current->ptrace & PT_PTRACED) != 0)
-		force_sig(SIGTRAP, current);
+	if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
+		return;
+	if (!current->ptrace)
+		return;
+	info.si_signo = SIGTRAP;
+	info.si_errno = 0;
+	info.si_code = TRAP_HWBKPT;
+	info.si_addr =
+		(void __force __user *) current->thread.per_event.address;
+	force_sig_info(SIGTRAP, &info, current);
 }
 
-asmlinkage void
-default_trap_handler(struct pt_regs * regs, long interruption_code)
+void default_trap_handler(struct pt_regs *regs)
 {
-        if (regs->psw.mask & PSW_MASK_PSTATE) {
-		local_irq_enable();
+	if (user_mode(regs)) {
+		report_user_fault(regs, SIGSEGV);
 		do_exit(SIGSEGV);
-		report_user_fault(interruption_code, regs);
 	} else
-		die("Unknown program exception", regs, interruption_code);
+		die(regs, "Unknown program exception");
 }
 
-#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); \
+#define DO_ERROR_INFO(name, signr, sicode, str) \
+void name(struct pt_regs *regs)			\
+{						\
+	do_trap(regs, signr, sicode, str);	\
 }
 
-DO_ERROR_INFO(SIGILL, "addressing exception", addressing_exception,
-	      ILL_ILLADR, get_check_address(regs))
-DO_ERROR_INFO(SIGILL,  "execute exception", execute_exception,
-	      ILL_ILLOPN, get_check_address(regs))
-DO_ERROR_INFO(SIGFPE,  "fixpoint divide exception", divide_exception,
-	      FPE_INTDIV, get_check_address(regs))
-DO_ERROR_INFO(SIGFPE,  "fixpoint overflow exception", overflow_exception,
-	      FPE_INTOVF, get_check_address(regs))
-DO_ERROR_INFO(SIGFPE,  "HFP overflow exception", hfp_overflow_exception,
-	      FPE_FLTOVF, get_check_address(regs))
-DO_ERROR_INFO(SIGFPE,  "HFP underflow exception", hfp_underflow_exception,
-	      FPE_FLTUND, get_check_address(regs))
-DO_ERROR_INFO(SIGFPE,  "HFP significance exception", hfp_significance_exception,
-	      FPE_FLTRES, get_check_address(regs))
-DO_ERROR_INFO(SIGFPE,  "HFP divide exception", hfp_divide_exception,
-	      FPE_FLTDIV, get_check_address(regs))
-DO_ERROR_INFO(SIGFPE,  "HFP square root exception", hfp_sqrt_exception,
-	      FPE_FLTINV, get_check_address(regs))
-DO_ERROR_INFO(SIGILL,  "operand exception", operand_exception,
-	      ILL_ILLOPN, get_check_address(regs))
-DO_ERROR_INFO(SIGILL,  "privileged operation", privileged_op,
-	      ILL_PRVOPC, get_check_address(regs))
-DO_ERROR_INFO(SIGILL,  "special operation exception", special_op_exception,
-	      ILL_ILLOPN, get_check_address(regs))
-DO_ERROR_INFO(SIGILL,  "translation exception", translation_exception,
-	      ILL_ILLOPN, get_check_address(regs))
-
-static inline void
-do_fp_trap(struct pt_regs *regs, void *location,
-           int fpc, long interruption_code)
-{
-	siginfo_t si;
+DO_ERROR_INFO(addressing_exception, SIGILL, ILL_ILLADR,
+	      "addressing exception")
+DO_ERROR_INFO(execute_exception, SIGILL, ILL_ILLOPN,
+	      "execute exception")
+DO_ERROR_INFO(divide_exception, SIGFPE, FPE_INTDIV,
+	      "fixpoint divide exception")
+DO_ERROR_INFO(overflow_exception, SIGFPE, FPE_INTOVF,
+	      "fixpoint overflow exception")
+DO_ERROR_INFO(hfp_overflow_exception, SIGFPE, FPE_FLTOVF,
+	      "HFP overflow exception")
+DO_ERROR_INFO(hfp_underflow_exception, SIGFPE, FPE_FLTUND,
+	      "HFP underflow exception")
+DO_ERROR_INFO(hfp_significance_exception, SIGFPE, FPE_FLTRES,
+	      "HFP significance exception")
+DO_ERROR_INFO(hfp_divide_exception, SIGFPE, FPE_FLTDIV,
+	      "HFP divide exception")
+DO_ERROR_INFO(hfp_sqrt_exception, SIGFPE, FPE_FLTINV,
+	      "HFP square root exception")
+DO_ERROR_INFO(operand_exception, SIGILL, ILL_ILLOPN,
+	      "operand exception")
+DO_ERROR_INFO(privileged_op, SIGILL, ILL_PRVOPC,
+	      "privileged operation")
+DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN,
+	      "special operation exception")
+DO_ERROR_INFO(translation_exception, SIGILL, ILL_ILLOPN,
+	      "translation exception")
+
+#ifdef CONFIG_64BIT
+DO_ERROR_INFO(transaction_exception, SIGILL, ILL_ILLOPN,
+	      "transaction constraint exception")
+#endif
 
-	si.si_signo = SIGFPE;
-	si.si_errno = 0;
-	si.si_addr = location;
-	si.si_code = 0;
+static inline void do_fp_trap(struct pt_regs *regs, int fpc)
+{
+	int si_code = 0;
 	/* FPC[2] is Data Exception Code */
 	if ((fpc & 0x00000300) == 0) {
 		/* bits 6 and 7 of DXC are 0 iff IEEE exception */
 		if (fpc & 0x8000) /* invalid fp operation */
-			si.si_code = FPE_FLTINV;
+			si_code = FPE_FLTINV;
 		else if (fpc & 0x4000) /* div by 0 */
-			si.si_code = FPE_FLTDIV;
+			si_code = FPE_FLTDIV;
 		else if (fpc & 0x2000) /* overflow */
-			si.si_code = FPE_FLTOVF;
+			si_code = FPE_FLTOVF;
 		else if (fpc & 0x1000) /* underflow */
-			si.si_code = FPE_FLTUND;
+			si_code = FPE_FLTUND;
 		else if (fpc & 0x0800) /* inexact */
-			si.si_code = FPE_FLTRES;
+			si_code = FPE_FLTRES;
 	}
-	current->thread.ieee_instruction_pointer = (addr_t) location;
-	do_trap(interruption_code, SIGFPE,
-		"floating point exception", regs, &si);
+	do_trap(regs, SIGFPE, si_code, "floating point exception");
 }
 
-asmlinkage void illegal_op(struct pt_regs * regs, long interruption_code)
+void __kprobes illegal_op(struct pt_regs *regs)
 {
 	siginfo_t info;
         __u8 opcode[6];
-	__u16 *location;
+	__u16 __user *location;
 	int signal = 0;
 
-	location = (__u16 *) get_check_address(regs);
-
-	/*
-	 * We got all needed information from the lowcore and can
-	 * now safely switch on interrupts.
-	 */
-	if (regs->psw.mask & PSW_MASK_PSTATE)
-		local_irq_enable();
+	location = get_trap_ip(regs);
 
-	if (regs->psw.mask & PSW_MASK_PSTATE) {
-		get_user(*((__u16 *) opcode), (__u16 __user *) location);
+	if (user_mode(regs)) {
+		if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
+			return;
 		if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
-			if (current->ptrace & PT_PTRACED)
-				force_sig(SIGTRAP, current);
-			else
+			if (current->ptrace) {
+				info.si_signo = SIGTRAP;
+				info.si_errno = 0;
+				info.si_code = TRAP_BRKPT;
+				info.si_addr = location;
+				force_sig_info(SIGTRAP, &info, current);
+			} else
 				signal = SIGILL;
 #ifdef CONFIG_MATHEMU
 		} else if (opcode[0] == 0xb3) {
-			get_user(*((__u16 *) (opcode+2)), location+1);
+			if (get_user(*((__u16 *) (opcode+2)), location+1))
+				return;
 			signal = math_emu_b3(opcode, regs);
                 } else if (opcode[0] == 0xed) {
-			get_user(*((__u32 *) (opcode+2)),
-				 (__u32 *)(location+1));
+			if (get_user(*((__u32 *) (opcode+2)),
+				     (__u32 __user *)(location+1)))
+				return;
 			signal = math_emu_ed(opcode, regs);
 		} else if (*((__u16 *) opcode) == 0xb299) {
-			get_user(*((__u16 *) (opcode+2)), location+1);
+			if (get_user(*((__u16 *) (opcode+2)), location+1))
+				return;
 			signal = math_emu_srnm(opcode, regs);
 		} else if (*((__u16 *) opcode) == 0xb29c) {
-			get_user(*((__u16 *) (opcode+2)), location+1);
+			if (get_user(*((__u16 *) (opcode+2)), location+1))
+				return;
 			signal = math_emu_stfpc(opcode, regs);
 		} else if (*((__u16 *) opcode) == 0xb29d) {
-			get_user(*((__u16 *) (opcode+2)), location+1);
+			if (get_user(*((__u16 *) (opcode+2)), location+1))
+				return;
 			signal = math_emu_lfpc(opcode, regs);
 #endif
 		} else
 			signal = SIGILL;
-	} else
-		signal = SIGILL;
+	} else {
+		/*
+		 * If we get an illegal op in kernel mode, send it through the
+		 * kprobes notifier. If kprobes doesn't pick it up, SIGILL
+		 */
+		if (notify_die(DIE_BPT, "bpt", regs, 0,
+			       3, SIGTRAP) != NOTIFY_STOP)
+			signal = SIGILL;
+	}
 
 #ifdef CONFIG_MATHEMU
         if (signal == SIGFPE)
-		do_fp_trap(regs, location,
-                           current->thread.fp_regs.fpc, interruption_code);
-        else if (signal == SIGSEGV) {
-		info.si_signo = signal;
-		info.si_errno = 0;
-		info.si_code = SEGV_MAPERR;
-		info.si_addr = (void *) location;
-		do_trap(interruption_code, signal,
-			"user address fault", regs, &info);
-	} else
+		do_fp_trap(regs, current->thread.fp_regs.fpc);
+	else if (signal == SIGSEGV)
+		do_trap(regs, signal, SEGV_MAPERR, "user address fault");
+	else
 #endif
-        if (signal) {
-		info.si_signo = signal;
-		info.si_errno = 0;
-		info.si_code = ILL_ILLOPC;
-		info.si_addr = (void *) location;
-		do_trap(interruption_code, signal,
-			"illegal operation", regs, &info);
-	}
+	if (signal)
+		do_trap(regs, signal, ILL_ILLOPC, "illegal operation");
 }
 
 
 #ifdef CONFIG_MATHEMU
-asmlinkage void 
-specification_exception(struct pt_regs * regs, long interruption_code)
+void specification_exception(struct pt_regs *regs)
 {
         __u8 opcode[6];
-	__u16 *location = NULL;
+	__u16 __user *location = NULL;
 	int signal = 0;
 
-	location = (__u16 *) get_check_address(regs);
-
-	/*
-	 * We got all needed information from the lowcore and can
-	 * now safely switch on interrupts.
-	 */
-        if (regs->psw.mask & PSW_MASK_PSTATE)
-		local_irq_enable();
+	location = (__u16 __user *) get_trap_ip(regs);
 
-        if (regs->psw.mask & PSW_MASK_PSTATE) {
+	if (user_mode(regs)) {
 		get_user(*((__u16 *) opcode), location);
 		switch (opcode[0]) {
 		case 0x28: /* LDR Rx,Ry   */
@@ -543,43 +283,27 @@ specification_exception(struct pt_regs * regs, long interruption_code)
 		signal = SIGILL;
 
         if (signal == SIGFPE)
-		do_fp_trap(regs, location,
-                           current->thread.fp_regs.fpc, interruption_code);
-        else if (signal) {
-		siginfo_t info;
-		info.si_signo = signal;
-		info.si_errno = 0;
-		info.si_code = ILL_ILLOPN;
-		info.si_addr = location;
-		do_trap(interruption_code, signal, 
-			"specification exception", regs, &info);
-	}
+		do_fp_trap(regs, current->thread.fp_regs.fpc);
+	else if (signal)
+		do_trap(regs, signal, ILL_ILLOPN, "specification exception");
 }
 #else
-DO_ERROR_INFO(SIGILL, "specification exception", specification_exception,
-	      ILL_ILLOPN, get_check_address(regs));
+DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
+	      "specification exception");
 #endif
 
-asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
+void data_exception(struct pt_regs *regs)
 {
-	__u16 *location;
+	__u16 __user *location;
 	int signal = 0;
 
-	location = (__u16 *) get_check_address(regs);
-
-	/*
-	 * We got all needed information from the lowcore and can
-	 * now safely switch on interrupts.
-	 */
-	if (regs->psw.mask & PSW_MASK_PSTATE)
-		local_irq_enable();
+	location = get_trap_ip(regs);
 
 	if (MACHINE_HAS_IEEE)
-		__asm__ volatile ("stfpc %0\n\t" 
-				  : "=m" (current->thread.fp_regs.fpc));
+		asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
 
 #ifdef CONFIG_MATHEMU
-        else if (regs->psw.mask & PSW_MASK_PSTATE) {
+	else if (user_mode(regs)) {
         	__u8 opcode[6];
 		get_user(*((__u16 *) opcode), location);
 		switch (opcode[0]) {
@@ -611,7 +335,7 @@ asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
 			break;
                 case 0xed:
 			get_user(*((__u32 *) (opcode+2)),
-				 (__u32 *)(location+1));
+				 (__u32 __user *)(location+1));
 			signal = math_emu_ed(opcode, regs);
 			break;
 	        case 0xb2:
@@ -638,35 +362,21 @@ asmlinkage void data_exception(struct pt_regs * regs, long interruption_code)
 	else
 		signal = SIGILL;
         if (signal == SIGFPE)
-		do_fp_trap(regs, location,
-                           current->thread.fp_regs.fpc, interruption_code);
-        else if (signal) {
-		siginfo_t info;
-		info.si_signo = signal;
-		info.si_errno = 0;
-		info.si_code = ILL_ILLOPN;
-		info.si_addr = location;
-		do_trap(interruption_code, signal, 
-			"data exception", regs, &info);
-	}
+		do_fp_trap(regs, current->thread.fp_regs.fpc);
+	else if (signal)
+		do_trap(regs, signal, ILL_ILLOPN, "data exception");
 }
 
-asmlinkage void space_switch_exception(struct pt_regs * regs, long int_code)
+void space_switch_exception(struct pt_regs *regs)
 {
-        siginfo_t info;
-
 	/* Set user psw back to home space mode. */
-	if (regs->psw.mask & PSW_MASK_PSTATE)
+	if (user_mode(regs))
 		regs->psw.mask |= PSW_ASC_HOME;
 	/* Send SIGILL. */
-        info.si_signo = SIGILL;
-        info.si_errno = 0;
-        info.si_code = ILL_PRVOPC;
-        info.si_addr = get_check_address(regs);
-        do_trap(int_code, SIGILL, "space switch event", regs, &info);
+	do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");
 }
 
-asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
+void __kprobes kernel_stack_overflow(struct pt_regs * regs)
 {
 	bust_spinlocks(1);
 	printk("Kernel stack overflow.\n");
@@ -675,59 +385,7 @@ asmlinkage void kernel_stack_overflow(struct pt_regs * regs)
 	panic("Corrupt kernel stack, can't continue.");
 }
 
-/* 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_protection_exception;
-        pgm_check_table[5] = &addressing_exception;
-        pgm_check_table[6] = &specification_exception;
-        pgm_check_table[7] = &data_exception;
-        pgm_check_table[8] = &overflow_exception;
-        pgm_check_table[9] = &divide_exception;
-        pgm_check_table[0x0A] = &overflow_exception;
-        pgm_check_table[0x0B] = &divide_exception;
-        pgm_check_table[0x0C] = &hfp_overflow_exception;
-        pgm_check_table[0x0D] = &hfp_underflow_exception;
-        pgm_check_table[0x0E] = &hfp_significance_exception;
-        pgm_check_table[0x0F] = &hfp_divide_exception;
-        pgm_check_table[0x10] = &do_dat_exception;
-        pgm_check_table[0x11] = &do_dat_exception;
-        pgm_check_table[0x12] = &translation_exception;
-        pgm_check_table[0x13] = &special_op_exception;
-#ifdef CONFIG_64BIT
-        pgm_check_table[0x38] = &do_dat_exception;
-	pgm_check_table[0x39] = &do_dat_exception;
-	pgm_check_table[0x3A] = &do_dat_exception;
-        pgm_check_table[0x3B] = &do_dat_exception;
-#endif /* CONFIG_64BIT */
-        pgm_check_table[0x15] = &operand_exception;
-        pgm_check_table[0x1C] = &space_switch_exception;
-        pgm_check_table[0x1D] = &hfp_sqrt_exception;
-	pgm_check_table[0x40] = &do_monitor_call;
-
-	if (MACHINE_IS_VM) {
-#ifdef CONFIG_PFAULT
-		/*
-		 * Try to get pfault pseudo page faults going.
-		 */
-		if (register_early_external_interrupt(0x2603, pfault_interrupt,
-						      &ext_int_pfault) != 0)
-			panic("Couldn't request external interrupt 0x2603");
-
-		if (pfault_init() == 0) 
-			return;
-		
-		/* Tough luck, no pfault. */
-		unregister_early_external_interrupt(0x2603, pfault_interrupt,
-						    &ext_int_pfault);
-#endif
-	}
+	local_mcck_enable();
 }