[deliverable/linux.git] / arch / s390 / kernel / traps.c

/*
 *  S390 version
 *    Copyright IBM Corp. 1999, 2000
 *    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/kprobes.h>
#include <linux/kdebug.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include "entry.h"

int show_unhandled_signals = 1;

static inline void __user *get_trap_ip(struct pt_regs *regs)
{
#ifdef CONFIG_64BIT
	unsigned long address;

	if (regs->int_code & 0x200)
		address = *(unsigned long *)(current->thread.trap_tdb + 24);
	else
		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
}

static inline void report_user_fault(struct pt_regs *regs, int signr)
{
	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_regs(regs);
}

int is_valid_bugaddr(unsigned long addr)
{
	return 1;
}

static void __kprobes do_trap(struct pt_regs *regs,
			      int si_signo, int si_code, char *str)
{
	siginfo_t info;

	if (notify_die(DIE_TRAP, str, regs, 0,
		       regs->int_code, si_signo) == NOTIFY_STOP)
		return;

	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 = 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);
		}
        }
}

void __kprobes do_per_trap(struct pt_regs *regs)
{
	siginfo_t info;

	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);
}

void default_trap_handler(struct pt_regs *regs)
{
	if (user_mode(regs)) {
		report_user_fault(regs, SIGSEGV);
		do_exit(SIGSEGV);
	} else
		die(regs, "Unknown program exception");
}

#define DO_ERROR_INFO(name, signr, sicode, str) \
void name(struct pt_regs *regs)			\
{						\
	do_trap(regs, signr, sicode, str);	\
}

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

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_code = FPE_FLTINV;
		else if (fpc & 0x4000) /* div by 0 */
			si_code = FPE_FLTDIV;
		else if (fpc & 0x2000) /* overflow */
			si_code = FPE_FLTOVF;
		else if (fpc & 0x1000) /* underflow */
			si_code = FPE_FLTUND;
		else if (fpc & 0x0800) /* inexact */
			si_code = FPE_FLTRES;
	}
	do_trap(regs, SIGFPE, si_code, "floating point exception");
}

void __kprobes illegal_op(struct pt_regs *regs)
{
	siginfo_t info;
        __u8 opcode[6];
	__u16 __user *location;
	int signal = 0;

	location = get_trap_ip(regs);

	if (user_mode(regs)) {
		if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
			return;
		if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
			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) {
			if (get_user(*((__u16 *) (opcode+2)), location+1))
				return;
			signal = math_emu_b3(opcode, regs);
                } else if (opcode[0] == 0xed) {
			if (get_user(*((__u32 *) (opcode+2)),
				     (__u32 __user *)(location+1)))
				return;
			signal = math_emu_ed(opcode, regs);
		} else if (*((__u16 *) opcode) == 0xb299) {
			if (get_user(*((__u16 *) (opcode+2)), location+1))
				return;
			signal = math_emu_srnm(opcode, regs);
		} else if (*((__u16 *) opcode) == 0xb29c) {
			if (get_user(*((__u16 *) (opcode+2)), location+1))
				return;
			signal = math_emu_stfpc(opcode, regs);
		} else if (*((__u16 *) opcode) == 0xb29d) {
			if (get_user(*((__u16 *) (opcode+2)), location+1))
				return;
			signal = math_emu_lfpc(opcode, regs);
#endif
		} 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, current->thread.fp_regs.fpc);
	else if (signal == SIGSEGV)
		do_trap(regs, signal, SEGV_MAPERR, "user address fault");
	else
#endif
	if (signal)
		do_trap(regs, signal, ILL_ILLOPC, "illegal operation");
}


#ifdef CONFIG_MATHEMU
void specification_exception(struct pt_regs *regs)
{
        __u8 opcode[6];
	__u16 __user *location = NULL;
	int signal = 0;

	location = (__u16 __user *) get_trap_ip(regs);

	if (user_mode(regs)) {
		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)
		do_fp_trap(regs, current->thread.fp_regs.fpc);
	else if (signal)
		do_trap(regs, signal, ILL_ILLOPN, "specification exception");
}
#else
DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
	      "specification exception");
#endif

void data_exception(struct pt_regs *regs)
{
	__u16 __user *location;
	int signal = 0;

	location = get_trap_ip(regs);

	if (MACHINE_HAS_IEEE)
		asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));

#ifdef CONFIG_MATHEMU
	else if (user_mode(regs)) {
        	__u8 opcode[6];
		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 __user *)(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)
		do_fp_trap(regs, current->thread.fp_regs.fpc);
	else if (signal)
		do_trap(regs, signal, ILL_ILLOPN, "data exception");
}

void space_switch_exception(struct pt_regs *regs)
{
	/* Set user psw back to home space mode. */
	if (user_mode(regs))
		regs->psw.mask |= PSW_ASC_HOME;
	/* Send SIGILL. */
	do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");
}

void __kprobes kernel_stack_overflow(struct pt_regs * regs)
{
	bust_spinlocks(1);
	printk("Kernel stack overflow.\n");
	show_regs(regs);
	bust_spinlocks(0);
	panic("Corrupt kernel stack, can't continue.");
}

void __init trap_init(void)
{
	local_mcck_enable();
}
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	* S390 version
a53c8fab	3	* Copyright IBM Corp. 1999, 2000
1da177e4 LT	4	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
	5	* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
	6	*
	7	* Derived from "arch/i386/kernel/traps.c"
	8	* Copyright (C) 1991, 1992 Linus Torvalds
	9	*/
	10
	11	/*
	12	* 'Traps.c' handles hardware traps and faults after we have saved some
	13	* state in 'asm.s'.
	14	*/
1bca09f7 HC	15	#include <linux/kprobes.h>
	16	#include <linux/kdebug.h>
	17	#include <linux/module.h>
73b7d40f	18	#include <linux/ptrace.h>
1bca09f7	19	#include <linux/sched.h>
1da177e4	20	#include <linux/mm.h>
a806170e	21	#include "entry.h"
1da177e4	22
02834eec	23	int show_unhandled_signals = 1;
1da177e4	24
d35339a4 MS	25	static inline void __user get_trap_ip(struct pt_regs regs)
	26	{
	27	#ifdef CONFIG_64BIT
	28	unsigned long address;
	29
	30	if (regs->int_code & 0x200)
	31	address = (unsigned long )(current->thread.trap_tdb + 24);
	32	else
	33	address = regs->psw.addr;
	34	return (void __user *)
	35	((address - (regs->int_code >> 16)) & PSW_ADDR_INSN);
	36	#else
	37	return (void __user *)
	38	((regs->psw.addr - (regs->int_code >> 16)) & PSW_ADDR_INSN);
	39	#endif
	40	}
	41
aa33c8cb	42	static inline void report_user_fault(struct pt_regs *regs, int signr)
1da177e4	43	{
ab3c68ee	44	if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
1da177e4	45	return;
ab3c68ee HC	46	if (!unhandled_signal(current, signr))
	47	return;
	48	if (!printk_ratelimit())
	49	return;
aa33c8cb	50	printk("User process fault: interruption code 0x%X ", regs->int_code);
ab3c68ee HC	51	print_vma_addr("in ", regs->psw.addr & PSW_ADDR_INSN);
ab3c68ee HC	52	printk("\n");
1da177e4	53	show_regs(regs);
1da177e4 LT	54	}
1da177e4 LT	55
c0007f1a HC	56	int is_valid_bugaddr(unsigned long addr)
	57	{
	58	return 1;
	59	}
	60
aa33c8cb MS	61	static void __kprobes do_trap(struct pt_regs *regs,
	62	int si_signo, int si_code, char *str)
	63	{
	64	siginfo_t info;
	65
	66	if (notify_die(DIE_TRAP, str, regs, 0,
	67	regs->int_code, si_signo) == NOTIFY_STOP)
4ba069b8 MG	68	return;
4ba069b8 MG	69
7d256175	70	if (user_mode(regs)) {
aa33c8cb MS	71	info.si_signo = si_signo;
	72	info.si_errno = 0;
	73	info.si_code = si_code;
d35339a4	74	info.si_addr = get_trap_ip(regs);
aa33c8cb MS	75	force_sig_info(si_signo, &info, current);
aa33c8cb MS	76	report_user_fault(regs, si_signo);
1da177e4 LT	77	} else {
	78	const struct exception_table_entry *fixup;
	79	fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
	80	if (fixup)
eb608fb3	81	regs->psw.addr = extable_fixup(fixup) \| PSW_ADDR_AMODE;
c0007f1a HC	82	else {
	83	enum bug_trap_type btt;
	84
608e2619	85	btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
c0007f1a HC	86	if (btt == BUG_TRAP_TYPE_WARN)
c0007f1a HC	87	return;
aa33c8cb	88	die(regs, str);
c0007f1a	89	}
1da177e4 LT	90	}
	91	}
	92
5e9a2692	93	void __kprobes do_per_trap(struct pt_regs *regs)
1da177e4	94	{
73b7d40f MS	95	siginfo_t info;
73b7d40f MS	96
5e9a2692	97	if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
4ba069b8	98	return;
73b7d40f MS	99	if (!current->ptrace)
	100	return;
	101	info.si_signo = SIGTRAP;
	102	info.si_errno = 0;
	103	info.si_code = TRAP_HWBKPT;
3c52e49d MS	104	info.si_addr =
3c52e49d MS	105	(void __force __user *) current->thread.per_event.address;
73b7d40f	106	force_sig_info(SIGTRAP, &info, current);
1da177e4 LT	107	}
1da177e4 LT	108
b01a37a7	109	void default_trap_handler(struct pt_regs *regs)
1da177e4	110	{
7d256175	111	if (user_mode(regs)) {
aa33c8cb	112	report_user_fault(regs, SIGSEGV);
6ea50968	113	do_exit(SIGSEGV);
1da177e4	114	} else
aa33c8cb	115	die(regs, "Unknown program exception");
1da177e4 LT	116	}
1da177e4 LT	117
1e54622e	118	#define DO_ERROR_INFO(name, signr, sicode, str) \
b01a37a7 HC	119	void name(struct pt_regs *regs) \
	120	{ \
	121	do_trap(regs, signr, sicode, str); \
1da177e4 LT	122	}
1da177e4 LT	123
1e54622e MS	124	DO_ERROR_INFO(addressing_exception, SIGILL, ILL_ILLADR,
	125	"addressing exception")
	126	DO_ERROR_INFO(execute_exception, SIGILL, ILL_ILLOPN,
	127	"execute exception")
	128	DO_ERROR_INFO(divide_exception, SIGFPE, FPE_INTDIV,
	129	"fixpoint divide exception")
	130	DO_ERROR_INFO(overflow_exception, SIGFPE, FPE_INTOVF,
	131	"fixpoint overflow exception")
	132	DO_ERROR_INFO(hfp_overflow_exception, SIGFPE, FPE_FLTOVF,
	133	"HFP overflow exception")
	134	DO_ERROR_INFO(hfp_underflow_exception, SIGFPE, FPE_FLTUND,
	135	"HFP underflow exception")
	136	DO_ERROR_INFO(hfp_significance_exception, SIGFPE, FPE_FLTRES,
	137	"HFP significance exception")
	138	DO_ERROR_INFO(hfp_divide_exception, SIGFPE, FPE_FLTDIV,
	139	"HFP divide exception")
	140	DO_ERROR_INFO(hfp_sqrt_exception, SIGFPE, FPE_FLTINV,
	141	"HFP square root exception")
	142	DO_ERROR_INFO(operand_exception, SIGILL, ILL_ILLOPN,
	143	"operand exception")
	144	DO_ERROR_INFO(privileged_op, SIGILL, ILL_PRVOPC,
	145	"privileged operation")
	146	DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN,
	147	"special operation exception")
	148	DO_ERROR_INFO(translation_exception, SIGILL, ILL_ILLOPN,
	149	"translation exception")
	150
d35339a4 MS	151	#ifdef CONFIG_64BIT
	152	DO_ERROR_INFO(transaction_exception, SIGILL, ILL_ILLOPN,
	153	"transaction constraint exception")
	154	#endif
	155
aa33c8cb	156	static inline void do_fp_trap(struct pt_regs *regs, int fpc)
1da177e4	157	{
aa33c8cb	158	int si_code = 0;
1da177e4 LT	159	/* FPC[2] is Data Exception Code */
	160	if ((fpc & 0x00000300) == 0) {
	161	/* bits 6 and 7 of DXC are 0 iff IEEE exception */
	162	if (fpc & 0x8000) /* invalid fp operation */
aa33c8cb	163	si_code = FPE_FLTINV;
1da177e4	164	else if (fpc & 0x4000) /* div by 0 */
aa33c8cb	165	si_code = FPE_FLTDIV;
1da177e4	166	else if (fpc & 0x2000) /* overflow */
aa33c8cb	167	si_code = FPE_FLTOVF;
1da177e4	168	else if (fpc & 0x1000) /* underflow */
aa33c8cb	169	si_code = FPE_FLTUND;
1da177e4	170	else if (fpc & 0x0800) /* inexact */
aa33c8cb	171	si_code = FPE_FLTRES;
1da177e4	172	}
aa33c8cb	173	do_trap(regs, SIGFPE, si_code, "floating point exception");
1da177e4 LT	174	}
1da177e4 LT	175
b01a37a7	176	void __kprobes illegal_op(struct pt_regs *regs)
1da177e4 LT	177	{
	178	siginfo_t info;
	179	__u8 opcode[6];
d2c993d8	180	__u16 __user *location;
1da177e4 LT	181	int signal = 0;
1da177e4 LT	182
d35339a4	183	location = get_trap_ip(regs);
1da177e4	184
7d256175	185	if (user_mode(regs)) {
12bae235 HC	186	if (get_user(((__u16 ) opcode), (__u16 __user *) location))
12bae235 HC	187	return;
1da177e4	188	if (((__u16 ) opcode) == S390_BREAKPOINT_U16) {
73b7d40f MS	189	if (current->ptrace) {
	190	info.si_signo = SIGTRAP;
	191	info.si_errno = 0;
	192	info.si_code = TRAP_BRKPT;
	193	info.si_addr = location;
	194	force_sig_info(SIGTRAP, &info, current);
	195	} else
1da177e4 LT	196	signal = SIGILL;
	197	#ifdef CONFIG_MATHEMU
	198	} else if (opcode[0] == 0xb3) {
12bae235 HC	199	if (get_user(((__u16 ) (opcode+2)), location+1))
12bae235 HC	200	return;
1da177e4 LT	201	signal = math_emu_b3(opcode, regs);
1da177e4 LT	202	} else if (opcode[0] == 0xed) {
12bae235 HC	203	if (get_user(((__u32 ) (opcode+2)),
	204	(__u32 __user *)(location+1)))
	205	return;
1da177e4 LT	206	signal = math_emu_ed(opcode, regs);
1da177e4 LT	207	} else if (((__u16 ) opcode) == 0xb299) {
12bae235 HC	208	if (get_user(((__u16 ) (opcode+2)), location+1))
12bae235 HC	209	return;
1da177e4 LT	210	signal = math_emu_srnm(opcode, regs);
1da177e4 LT	211	} else if (((__u16 ) opcode) == 0xb29c) {
12bae235 HC	212	if (get_user(((__u16 ) (opcode+2)), location+1))
12bae235 HC	213	return;
1da177e4 LT	214	signal = math_emu_stfpc(opcode, regs);
1da177e4 LT	215	} else if (((__u16 ) opcode) == 0xb29d) {
12bae235 HC	216	if (get_user(((__u16 ) (opcode+2)), location+1))
12bae235 HC	217	return;
1da177e4 LT	218	signal = math_emu_lfpc(opcode, regs);
	219	#endif
	220	} else
	221	signal = SIGILL;
35df8d53 HC	222	} else {
	223	/*
	224	* If we get an illegal op in kernel mode, send it through the
	225	* kprobes notifier. If kprobes doesn't pick it up, SIGILL
	226	*/
aa33c8cb	227	if (notify_die(DIE_BPT, "bpt", regs, 0,
35df8d53 HC	228	3, SIGTRAP) != NOTIFY_STOP)
	229	signal = SIGILL;
	230	}
1da177e4 LT	231
	232	#ifdef CONFIG_MATHEMU
	233	if (signal == SIGFPE)
aa33c8cb MS	234	do_fp_trap(regs, current->thread.fp_regs.fpc);
	235	else if (signal == SIGSEGV)
	236	do_trap(regs, signal, SEGV_MAPERR, "user address fault");
	237	else
1da177e4	238	#endif
aa33c8cb MS	239	if (signal)
aa33c8cb MS	240	do_trap(regs, signal, ILL_ILLOPC, "illegal operation");
1da177e4 LT	241	}
	242
	243
	244	#ifdef CONFIG_MATHEMU
aa33c8cb	245	void specification_exception(struct pt_regs *regs)
1da177e4 LT	246	{
1da177e4 LT	247	__u8 opcode[6];
5a42b81f	248	__u16 __user *location = NULL;
1da177e4 LT	249	int signal = 0;
1da177e4 LT	250
d35339a4	251	location = (__u16 __user *) get_trap_ip(regs);
1da177e4	252
7d256175	253	if (user_mode(regs)) {
1da177e4 LT	254	get_user(((__u16 ) opcode), location);
	255	switch (opcode[0]) {
	256	case 0x28: /* LDR Rx,Ry */
	257	signal = math_emu_ldr(opcode);
	258	break;
	259	case 0x38: /* LER Rx,Ry */
	260	signal = math_emu_ler(opcode);
	261	break;
	262	case 0x60: /* STD R,D(X,B) */
	263	get_user(((__u16 ) (opcode+2)), location+1);
	264	signal = math_emu_std(opcode, regs);
	265	break;
	266	case 0x68: /* LD R,D(X,B) */
	267	get_user(((__u16 ) (opcode+2)), location+1);
	268	signal = math_emu_ld(opcode, regs);
	269	break;
	270	case 0x70: /* STE R,D(X,B) */
	271	get_user(((__u16 ) (opcode+2)), location+1);
	272	signal = math_emu_ste(opcode, regs);
	273	break;
	274	case 0x78: /* LE R,D(X,B) */
	275	get_user(((__u16 ) (opcode+2)), location+1);
	276	signal = math_emu_le(opcode, regs);
	277	break;
	278	default:
	279	signal = SIGILL;
	280	break;
	281	}
	282	} else
	283	signal = SIGILL;
	284
	285	if (signal == SIGFPE)
aa33c8cb MS	286	do_fp_trap(regs, current->thread.fp_regs.fpc);
	287	else if (signal)
	288	do_trap(regs, signal, ILL_ILLOPN, "specification exception");
1da177e4 LT	289	}
1da177e4 LT	290	#else
1e54622e MS	291	DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
1e54622e MS	292	"specification exception");
1da177e4 LT	293	#endif
1da177e4 LT	294
b01a37a7	295	void data_exception(struct pt_regs *regs)
1da177e4	296	{
d2c993d8	297	__u16 __user *location;
1da177e4 LT	298	int signal = 0;
1da177e4 LT	299
d35339a4	300	location = get_trap_ip(regs);
1da177e4 LT	301
1da177e4 LT	302	if (MACHINE_HAS_IEEE)
94c12cc7	303	asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
1da177e4 LT	304
1da177e4 LT	305	#ifdef CONFIG_MATHEMU
7d256175	306	else if (user_mode(regs)) {
1da177e4 LT	307	__u8 opcode[6];
	308	get_user(((__u16 ) opcode), location);
	309	switch (opcode[0]) {
	310	case 0x28: /* LDR Rx,Ry */
	311	signal = math_emu_ldr(opcode);
	312	break;
	313	case 0x38: /* LER Rx,Ry */
	314	signal = math_emu_ler(opcode);
	315	break;
	316	case 0x60: /* STD R,D(X,B) */
	317	get_user(((__u16 ) (opcode+2)), location+1);
	318	signal = math_emu_std(opcode, regs);
	319	break;
	320	case 0x68: /* LD R,D(X,B) */
	321	get_user(((__u16 ) (opcode+2)), location+1);
	322	signal = math_emu_ld(opcode, regs);
	323	break;
	324	case 0x70: /* STE R,D(X,B) */
	325	get_user(((__u16 ) (opcode+2)), location+1);
	326	signal = math_emu_ste(opcode, regs);
	327	break;
	328	case 0x78: /* LE R,D(X,B) */
	329	get_user(((__u16 ) (opcode+2)), location+1);
	330	signal = math_emu_le(opcode, regs);
	331	break;
	332	case 0xb3:
	333	get_user(((__u16 ) (opcode+2)), location+1);
	334	signal = math_emu_b3(opcode, regs);
	335	break;
	336	case 0xed:
	337	get_user(((__u32 ) (opcode+2)),
5a42b81f	338	(__u32 __user *)(location+1));
1da177e4 LT	339	signal = math_emu_ed(opcode, regs);
	340	break;
	341	case 0xb2:
	342	if (opcode[1] == 0x99) {
	343	get_user(((__u16 ) (opcode+2)), location+1);
	344	signal = math_emu_srnm(opcode, regs);
	345	} else if (opcode[1] == 0x9c) {
	346	get_user(((__u16 ) (opcode+2)), location+1);
	347	signal = math_emu_stfpc(opcode, regs);
	348	} else if (opcode[1] == 0x9d) {
	349	get_user(((__u16 ) (opcode+2)), location+1);
	350	signal = math_emu_lfpc(opcode, regs);
	351	} else
	352	signal = SIGILL;
	353	break;
	354	default:
	355	signal = SIGILL;
	356	break;
	357	}
	358	}
	359	#endif
	360	if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
	361	signal = SIGFPE;
	362	else
	363	signal = SIGILL;
	364	if (signal == SIGFPE)
aa33c8cb MS	365	do_fp_trap(regs, current->thread.fp_regs.fpc);
	366	else if (signal)
	367	do_trap(regs, signal, ILL_ILLOPN, "data exception");
1da177e4 LT	368	}
1da177e4 LT	369
b01a37a7	370	void space_switch_exception(struct pt_regs *regs)
1da177e4	371	{
1da177e4	372	/* Set user psw back to home space mode. */
7d256175	373	if (user_mode(regs))
1da177e4 LT	374	regs->psw.mask \|= PSW_ASC_HOME;
1da177e4 LT	375	/* Send SIGILL. */
aa33c8cb	376	do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");
1da177e4 LT	377	}
1da177e4 LT	378
fdb204d1	379	void __kprobes kernel_stack_overflow(struct pt_regs * regs)
1da177e4	380	{
77eb65cb HC	381	bust_spinlocks(1);
	382	printk("Kernel stack overflow.\n");
	383	show_regs(regs);
	384	bust_spinlocks(0);
1da177e4 LT	385	panic("Corrupt kernel stack, can't continue.");
	386	}
	387
1da177e4 LT	388	void __init trap_init(void)
1da177e4 LT	389	{
f3e1a273	390	local_mcck_enable();
1da177e4	391	}