[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;
}

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

	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);
		}
        }
}

static void __kprobes do_trap(struct pt_regs *regs, int si_signo, int si_code,
			      char *str)
{
	if (notify_die(DIE_TRAP, str, regs, 0,
		       regs->int_code, si_signo) == NOTIFY_STOP)
		return;
	do_report_trap(regs, si_signo, si_code, 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 is_uprobe_insn = 0;
	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_UPROBES
		} else if (*((__u16 *) opcode) == UPROBE_SWBP_INSN) {
			is_uprobe_insn = 1;
#endif
#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;
	}
	/*
	 * We got either an illegal op in kernel mode, or user space trapped
	 * on a uprobes illegal instruction. See if kprobes or uprobes picks
	 * it up. If not, SIGILL.
	 */
	if (is_uprobe_insn || !user_mode(regs)) {
		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
2a0a5b22	61	void do_report_trap(struct pt_regs regs, int si_signo, int si_code, char str)
aa33c8cb MS	62	{
	63	siginfo_t info;
	64
7d256175	65	if (user_mode(regs)) {
aa33c8cb MS	66	info.si_signo = si_signo;
	67	info.si_errno = 0;
	68	info.si_code = si_code;
d35339a4	69	info.si_addr = get_trap_ip(regs);
aa33c8cb MS	70	force_sig_info(si_signo, &info, current);
aa33c8cb MS	71	report_user_fault(regs, si_signo);
1da177e4 LT	72	} else {
	73	const struct exception_table_entry *fixup;
	74	fixup = search_exception_tables(regs->psw.addr & PSW_ADDR_INSN);
	75	if (fixup)
eb608fb3	76	regs->psw.addr = extable_fixup(fixup) \| PSW_ADDR_AMODE;
c0007f1a HC	77	else {
	78	enum bug_trap_type btt;
	79
608e2619	80	btt = report_bug(regs->psw.addr & PSW_ADDR_INSN, regs);
c0007f1a HC	81	if (btt == BUG_TRAP_TYPE_WARN)
c0007f1a HC	82	return;
aa33c8cb	83	die(regs, str);
c0007f1a	84	}
1da177e4 LT	85	}
	86	}
	87
2a0a5b22 JW	88	static void __kprobes do_trap(struct pt_regs *regs, int si_signo, int si_code,
	89	char *str)
	90	{
	91	if (notify_die(DIE_TRAP, str, regs, 0,
	92	regs->int_code, si_signo) == NOTIFY_STOP)
	93	return;
	94	do_report_trap(regs, si_signo, si_code, str);
	95	}
	96
5e9a2692	97	void __kprobes do_per_trap(struct pt_regs *regs)
1da177e4	98	{
73b7d40f MS	99	siginfo_t info;
73b7d40f MS	100
5e9a2692	101	if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
4ba069b8	102	return;
73b7d40f MS	103	if (!current->ptrace)
	104	return;
	105	info.si_signo = SIGTRAP;
	106	info.si_errno = 0;
	107	info.si_code = TRAP_HWBKPT;
3c52e49d MS	108	info.si_addr =
3c52e49d MS	109	(void __force __user *) current->thread.per_event.address;
73b7d40f	110	force_sig_info(SIGTRAP, &info, current);
1da177e4 LT	111	}
1da177e4 LT	112
b01a37a7	113	void default_trap_handler(struct pt_regs *regs)
1da177e4	114	{
7d256175	115	if (user_mode(regs)) {
aa33c8cb	116	report_user_fault(regs, SIGSEGV);
6ea50968	117	do_exit(SIGSEGV);
1da177e4	118	} else
aa33c8cb	119	die(regs, "Unknown program exception");
1da177e4 LT	120	}
1da177e4 LT	121
1e54622e	122	#define DO_ERROR_INFO(name, signr, sicode, str) \
b01a37a7 HC	123	void name(struct pt_regs *regs) \
	124	{ \
	125	do_trap(regs, signr, sicode, str); \
1da177e4 LT	126	}
1da177e4 LT	127
1e54622e MS	128	DO_ERROR_INFO(addressing_exception, SIGILL, ILL_ILLADR,
	129	"addressing exception")
	130	DO_ERROR_INFO(execute_exception, SIGILL, ILL_ILLOPN,
	131	"execute exception")
	132	DO_ERROR_INFO(divide_exception, SIGFPE, FPE_INTDIV,
	133	"fixpoint divide exception")
	134	DO_ERROR_INFO(overflow_exception, SIGFPE, FPE_INTOVF,
	135	"fixpoint overflow exception")
	136	DO_ERROR_INFO(hfp_overflow_exception, SIGFPE, FPE_FLTOVF,
	137	"HFP overflow exception")
	138	DO_ERROR_INFO(hfp_underflow_exception, SIGFPE, FPE_FLTUND,
	139	"HFP underflow exception")
	140	DO_ERROR_INFO(hfp_significance_exception, SIGFPE, FPE_FLTRES,
	141	"HFP significance exception")
	142	DO_ERROR_INFO(hfp_divide_exception, SIGFPE, FPE_FLTDIV,
	143	"HFP divide exception")
	144	DO_ERROR_INFO(hfp_sqrt_exception, SIGFPE, FPE_FLTINV,
	145	"HFP square root exception")
	146	DO_ERROR_INFO(operand_exception, SIGILL, ILL_ILLOPN,
	147	"operand exception")
	148	DO_ERROR_INFO(privileged_op, SIGILL, ILL_PRVOPC,
	149	"privileged operation")
	150	DO_ERROR_INFO(special_op_exception, SIGILL, ILL_ILLOPN,
	151	"special operation exception")
	152	DO_ERROR_INFO(translation_exception, SIGILL, ILL_ILLOPN,
	153	"translation exception")
	154
d35339a4 MS	155	#ifdef CONFIG_64BIT
	156	DO_ERROR_INFO(transaction_exception, SIGILL, ILL_ILLOPN,
	157	"transaction constraint exception")
	158	#endif
	159
aa33c8cb	160	static inline void do_fp_trap(struct pt_regs *regs, int fpc)
1da177e4	161	{
aa33c8cb	162	int si_code = 0;
1da177e4 LT	163	/* FPC[2] is Data Exception Code */
	164	if ((fpc & 0x00000300) == 0) {
	165	/* bits 6 and 7 of DXC are 0 iff IEEE exception */
	166	if (fpc & 0x8000) /* invalid fp operation */
aa33c8cb	167	si_code = FPE_FLTINV;
1da177e4	168	else if (fpc & 0x4000) /* div by 0 */
aa33c8cb	169	si_code = FPE_FLTDIV;
1da177e4	170	else if (fpc & 0x2000) /* overflow */
aa33c8cb	171	si_code = FPE_FLTOVF;
1da177e4	172	else if (fpc & 0x1000) /* underflow */
aa33c8cb	173	si_code = FPE_FLTUND;
1da177e4	174	else if (fpc & 0x0800) /* inexact */
aa33c8cb	175	si_code = FPE_FLTRES;
1da177e4	176	}
aa33c8cb	177	do_trap(regs, SIGFPE, si_code, "floating point exception");
1da177e4 LT	178	}
1da177e4 LT	179
b01a37a7	180	void __kprobes illegal_op(struct pt_regs *regs)
1da177e4 LT	181	{
	182	siginfo_t info;
	183	__u8 opcode[6];
d2c993d8	184	__u16 __user *location;
2a0a5b22	185	int is_uprobe_insn = 0;
1da177e4 LT	186	int signal = 0;
1da177e4 LT	187
d35339a4	188	location = get_trap_ip(regs);
1da177e4	189
7d256175	190	if (user_mode(regs)) {
12bae235 HC	191	if (get_user(((__u16 ) opcode), (__u16 __user *) location))
12bae235 HC	192	return;
1da177e4	193	if (((__u16 ) opcode) == S390_BREAKPOINT_U16) {
73b7d40f MS	194	if (current->ptrace) {
	195	info.si_signo = SIGTRAP;
	196	info.si_errno = 0;
	197	info.si_code = TRAP_BRKPT;
	198	info.si_addr = location;
	199	force_sig_info(SIGTRAP, &info, current);
	200	} else
1da177e4	201	signal = SIGILL;
2a0a5b22 JW	202	#ifdef CONFIG_UPROBES
	203	} else if (((__u16 ) opcode) == UPROBE_SWBP_INSN) {
	204	is_uprobe_insn = 1;
	205	#endif
1da177e4 LT	206	#ifdef CONFIG_MATHEMU
1da177e4 LT	207	} else if (opcode[0] == 0xb3) {
12bae235 HC	208	if (get_user(((__u16 ) (opcode+2)), location+1))
12bae235 HC	209	return;
1da177e4 LT	210	signal = math_emu_b3(opcode, regs);
1da177e4 LT	211	} else if (opcode[0] == 0xed) {
12bae235 HC	212	if (get_user(((__u32 ) (opcode+2)),
	213	(__u32 __user *)(location+1)))
	214	return;
1da177e4 LT	215	signal = math_emu_ed(opcode, regs);
1da177e4 LT	216	} else if (((__u16 ) opcode) == 0xb299) {
12bae235 HC	217	if (get_user(((__u16 ) (opcode+2)), location+1))
12bae235 HC	218	return;
1da177e4 LT	219	signal = math_emu_srnm(opcode, regs);
1da177e4 LT	220	} else if (((__u16 ) opcode) == 0xb29c) {
12bae235 HC	221	if (get_user(((__u16 ) (opcode+2)), location+1))
12bae235 HC	222	return;
1da177e4 LT	223	signal = math_emu_stfpc(opcode, regs);
1da177e4 LT	224	} else if (((__u16 ) opcode) == 0xb29d) {
12bae235 HC	225	if (get_user(((__u16 ) (opcode+2)), location+1))
12bae235 HC	226	return;
1da177e4 LT	227	signal = math_emu_lfpc(opcode, regs);
	228	#endif
	229	} else
	230	signal = SIGILL;
2a0a5b22 JW	231	}
	232	/*
	233	* We got either an illegal op in kernel mode, or user space trapped
	234	* on a uprobes illegal instruction. See if kprobes or uprobes picks
	235	* it up. If not, SIGILL.
	236	*/
	237	if (is_uprobe_insn \|\| !user_mode(regs)) {
aa33c8cb	238	if (notify_die(DIE_BPT, "bpt", regs, 0,
35df8d53 HC	239	3, SIGTRAP) != NOTIFY_STOP)
	240	signal = SIGILL;
	241	}
1da177e4 LT	242
	243	#ifdef CONFIG_MATHEMU
	244	if (signal == SIGFPE)
aa33c8cb MS	245	do_fp_trap(regs, current->thread.fp_regs.fpc);
	246	else if (signal == SIGSEGV)
	247	do_trap(regs, signal, SEGV_MAPERR, "user address fault");
	248	else
1da177e4	249	#endif
aa33c8cb MS	250	if (signal)
aa33c8cb MS	251	do_trap(regs, signal, ILL_ILLOPC, "illegal operation");
1da177e4 LT	252	}
	253
	254
	255	#ifdef CONFIG_MATHEMU
aa33c8cb	256	void specification_exception(struct pt_regs *regs)
1da177e4 LT	257	{
1da177e4 LT	258	__u8 opcode[6];
5a42b81f	259	__u16 __user *location = NULL;
1da177e4 LT	260	int signal = 0;
1da177e4 LT	261
d35339a4	262	location = (__u16 __user *) get_trap_ip(regs);
1da177e4	263
7d256175	264	if (user_mode(regs)) {
1da177e4 LT	265	get_user(((__u16 ) opcode), location);
	266	switch (opcode[0]) {
	267	case 0x28: /* LDR Rx,Ry */
	268	signal = math_emu_ldr(opcode);
	269	break;
	270	case 0x38: /* LER Rx,Ry */
	271	signal = math_emu_ler(opcode);
	272	break;
	273	case 0x60: /* STD R,D(X,B) */
	274	get_user(((__u16 ) (opcode+2)), location+1);
	275	signal = math_emu_std(opcode, regs);
	276	break;
	277	case 0x68: /* LD R,D(X,B) */
	278	get_user(((__u16 ) (opcode+2)), location+1);
	279	signal = math_emu_ld(opcode, regs);
	280	break;
	281	case 0x70: /* STE R,D(X,B) */
	282	get_user(((__u16 ) (opcode+2)), location+1);
	283	signal = math_emu_ste(opcode, regs);
	284	break;
	285	case 0x78: /* LE R,D(X,B) */
	286	get_user(((__u16 ) (opcode+2)), location+1);
	287	signal = math_emu_le(opcode, regs);
	288	break;
	289	default:
	290	signal = SIGILL;
	291	break;
	292	}
	293	} else
	294	signal = SIGILL;
	295
	296	if (signal == SIGFPE)
aa33c8cb MS	297	do_fp_trap(regs, current->thread.fp_regs.fpc);
	298	else if (signal)
	299	do_trap(regs, signal, ILL_ILLOPN, "specification exception");
1da177e4 LT	300	}
1da177e4 LT	301	#else
1e54622e MS	302	DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
1e54622e MS	303	"specification exception");
1da177e4 LT	304	#endif
1da177e4 LT	305
b01a37a7	306	void data_exception(struct pt_regs *regs)
1da177e4	307	{
d2c993d8	308	__u16 __user *location;
1da177e4 LT	309	int signal = 0;
1da177e4 LT	310
d35339a4	311	location = get_trap_ip(regs);
1da177e4 LT	312
1da177e4 LT	313	if (MACHINE_HAS_IEEE)
94c12cc7	314	asm volatile("stfpc %0" : "=m" (current->thread.fp_regs.fpc));
1da177e4 LT	315
1da177e4 LT	316	#ifdef CONFIG_MATHEMU
7d256175	317	else if (user_mode(regs)) {
1da177e4 LT	318	__u8 opcode[6];
	319	get_user(((__u16 ) opcode), location);
	320	switch (opcode[0]) {
	321	case 0x28: /* LDR Rx,Ry */
	322	signal = math_emu_ldr(opcode);
	323	break;
	324	case 0x38: /* LER Rx,Ry */
	325	signal = math_emu_ler(opcode);
	326	break;
	327	case 0x60: /* STD R,D(X,B) */
	328	get_user(((__u16 ) (opcode+2)), location+1);
	329	signal = math_emu_std(opcode, regs);
	330	break;
	331	case 0x68: /* LD R,D(X,B) */
	332	get_user(((__u16 ) (opcode+2)), location+1);
	333	signal = math_emu_ld(opcode, regs);
	334	break;
	335	case 0x70: /* STE R,D(X,B) */
	336	get_user(((__u16 ) (opcode+2)), location+1);
	337	signal = math_emu_ste(opcode, regs);
	338	break;
	339	case 0x78: /* LE R,D(X,B) */
	340	get_user(((__u16 ) (opcode+2)), location+1);
	341	signal = math_emu_le(opcode, regs);
	342	break;
	343	case 0xb3:
	344	get_user(((__u16 ) (opcode+2)), location+1);
	345	signal = math_emu_b3(opcode, regs);
	346	break;
	347	case 0xed:
	348	get_user(((__u32 ) (opcode+2)),
5a42b81f	349	(__u32 __user *)(location+1));
1da177e4 LT	350	signal = math_emu_ed(opcode, regs);
	351	break;
	352	case 0xb2:
	353	if (opcode[1] == 0x99) {
	354	get_user(((__u16 ) (opcode+2)), location+1);
	355	signal = math_emu_srnm(opcode, regs);
	356	} else if (opcode[1] == 0x9c) {
	357	get_user(((__u16 ) (opcode+2)), location+1);
	358	signal = math_emu_stfpc(opcode, regs);
	359	} else if (opcode[1] == 0x9d) {
	360	get_user(((__u16 ) (opcode+2)), location+1);
	361	signal = math_emu_lfpc(opcode, regs);
	362	} else
	363	signal = SIGILL;
	364	break;
	365	default:
	366	signal = SIGILL;
	367	break;
	368	}
	369	}
	370	#endif
	371	if (current->thread.fp_regs.fpc & FPC_DXC_MASK)
	372	signal = SIGFPE;
	373	else
	374	signal = SIGILL;
	375	if (signal == SIGFPE)
aa33c8cb MS	376	do_fp_trap(regs, current->thread.fp_regs.fpc);
	377	else if (signal)
	378	do_trap(regs, signal, ILL_ILLOPN, "data exception");
1da177e4 LT	379	}
1da177e4 LT	380
b01a37a7	381	void space_switch_exception(struct pt_regs *regs)
1da177e4	382	{
1da177e4	383	/* Set user psw back to home space mode. */
7d256175	384	if (user_mode(regs))
1da177e4 LT	385	regs->psw.mask \|= PSW_ASC_HOME;
1da177e4 LT	386	/* Send SIGILL. */
aa33c8cb	387	do_trap(regs, SIGILL, ILL_PRVOPC, "space switch event");
1da177e4 LT	388	}
1da177e4 LT	389
fdb204d1	390	void __kprobes kernel_stack_overflow(struct pt_regs * regs)
1da177e4	391	{
77eb65cb HC	392	bust_spinlocks(1);
	393	printk("Kernel stack overflow.\n");
	394	show_regs(regs);
	395	bust_spinlocks(0);
1da177e4 LT	396	panic("Corrupt kernel stack, can't continue.");
	397	}
	398
1da177e4 LT	399	void __init trap_init(void)
1da177e4 LT	400	{
f3e1a273	401	local_mcck_enable();
1da177e4	402	}