[net-next-2.6.git] / arch / sparc / kernel / unaligned_32.c

/*
 * unaligned.c: Unaligned load/store trap handling with special
 *              cases for the kernel to do them more quickly.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */


#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/perf_event.h>

enum direction {
	load,    /* ld, ldd, ldh, ldsh */
	store,   /* st, std, sth, stsh */
	both,    /* Swap, ldstub, etc. */
	fpload,
	fpstore,
	invalid,
};

static inline enum direction decode_direction(unsigned int insn)
{
	unsigned long tmp = (insn >> 21) & 1;

	if(!tmp)
		return load;
	else {
		if(((insn>>19)&0x3f) == 15)
			return both;
		else
			return store;
	}
}

/* 8 = double-word, 4 = word, 2 = half-word */
static inline int decode_access_size(unsigned int insn)
{
	insn = (insn >> 19) & 3;

	if(!insn)
		return 4;
	else if(insn == 3)
		return 8;
	else if(insn == 2)
		return 2;
	else {
		printk("Impossible unaligned trap. insn=%08x\n", insn);
		die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
		return 4; /* just to keep gcc happy. */
	}
}

/* 0x400000 = signed, 0 = unsigned */
static inline int decode_signedness(unsigned int insn)
{
	return (insn & 0x400000);
}

static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
				       unsigned int rd)
{
	if(rs2 >= 16 || rs1 >= 16 || rd >= 16) {
		/* Wheee... */
		__asm__ __volatile__("save %sp, -0x40, %sp\n\t"
				     "save %sp, -0x40, %sp\n\t"
				     "save %sp, -0x40, %sp\n\t"
				     "save %sp, -0x40, %sp\n\t"
				     "save %sp, -0x40, %sp\n\t"
				     "save %sp, -0x40, %sp\n\t"
				     "save %sp, -0x40, %sp\n\t"
				     "restore; restore; restore; restore;\n\t"
				     "restore; restore; restore;\n\t");
	}
}

static inline int sign_extend_imm13(int imm)
{
	return imm << 19 >> 19;
}

static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
{
	struct reg_window32 *win;

	if(reg < 16)
		return (!reg ? 0 : regs->u_regs[reg]);

	/* Ho hum, the slightly complicated case. */
	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
	return win->locals[reg - 16]; /* yes, I know what this does... */
}

static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
{
	struct reg_window32 __user *win;
	unsigned long ret;

	if (reg < 16)
		return (!reg ? 0 : regs->u_regs[reg]);

	/* Ho hum, the slightly complicated case. */
	win = (struct reg_window32 __user *) regs->u_regs[UREG_FP];

	if ((unsigned long)win & 3)
		return -1;

	if (get_user(ret, &win->locals[reg - 16]))
		return -1;

	return ret;
}

static inline unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs)
{
	struct reg_window32 *win;

	if(reg < 16)
		return &regs->u_regs[reg];
	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
	return &win->locals[reg - 16];
}

static unsigned long compute_effective_address(struct pt_regs *regs,
					       unsigned int insn)
{
	unsigned int rs1 = (insn >> 14) & 0x1f;
	unsigned int rs2 = insn & 0x1f;
	unsigned int rd = (insn >> 25) & 0x1f;

	if(insn & 0x2000) {
		maybe_flush_windows(rs1, 0, rd);
		return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	} else {
		maybe_flush_windows(rs1, rs2, rd);
		return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
	}
}

unsigned long safe_compute_effective_address(struct pt_regs *regs,
					     unsigned int insn)
{
	unsigned int rs1 = (insn >> 14) & 0x1f;
	unsigned int rs2 = insn & 0x1f;
	unsigned int rd = (insn >> 25) & 0x1f;

	if(insn & 0x2000) {
		maybe_flush_windows(rs1, 0, rd);
		return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	} else {
		maybe_flush_windows(rs1, rs2, rd);
		return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
	}
}

/* This is just to make gcc think panic does return... */
static void unaligned_panic(char *str)
{
	panic(str);
}

/* una_asm.S */
extern int do_int_load(unsigned long *dest_reg, int size,
		       unsigned long *saddr, int is_signed);
extern int __do_int_store(unsigned long *dst_addr, int size,
			  unsigned long *src_val);

static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
			struct pt_regs *regs)
{
	unsigned long zero[2] = { 0, 0 };
	unsigned long *src_val;

	if (reg_num)
		src_val = fetch_reg_addr(reg_num, regs);
	else {
		src_val = &zero[0];
		if (size == 8)
			zero[1] = fetch_reg(1, regs);
	}
	return __do_int_store(dst_addr, size, src_val);
}

extern void smp_capture(void);
extern void smp_release(void);

static inline void advance(struct pt_regs *regs)
{
	regs->pc   = regs->npc;
	regs->npc += 4;
}

static inline int floating_point_load_or_store_p(unsigned int insn)
{
	return (insn >> 24) & 1;
}

static inline int ok_for_kernel(unsigned int insn)
{
	return !floating_point_load_or_store_p(insn);
}

static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
{
	unsigned long g2 = regs->u_regs [UREG_G2];
	unsigned long fixup = search_extables_range(regs->pc, &g2);

	if (!fixup) {
		unsigned long address = compute_effective_address(regs, insn);
        	if(address < PAGE_SIZE) {
                	printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
        	} else
                	printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
	        printk(KERN_ALERT " at virtual address %08lx\n",address);
		printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
			(current->mm ? current->mm->context :
			current->active_mm->context));
		printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
			(current->mm ? (unsigned long) current->mm->pgd :
			(unsigned long) current->active_mm->pgd));
	        die_if_kernel("Oops", regs);
		/* Not reached */
	}
	regs->pc = fixup;
	regs->npc = regs->pc + 4;
	regs->u_regs [UREG_G2] = g2;
}

asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
{
	enum direction dir = decode_direction(insn);
	int size = decode_access_size(insn);

	if(!ok_for_kernel(insn) || dir == both) {
		printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n",
		       regs->pc);
		unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store.");
	} else {
		unsigned long addr = compute_effective_address(regs, insn);
		int err;

		perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0, regs, addr);
		switch (dir) {
		case load:
			err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
							 regs),
					  size, (unsigned long *) addr,
					  decode_signedness(insn));
			break;

		case store:
			err = do_int_store(((insn>>25)&0x1f), size,
					   (unsigned long *) addr, regs);
			break;
		default:
			panic("Impossible kernel unaligned trap.");
			/* Not reached... */
		}
		if (err)
			kernel_mna_trap_fault(regs, insn);
		else
			advance(regs);
	}
}

static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
			      enum direction dir)
{
	unsigned int reg;
	int check = (dir == load) ? VERIFY_READ : VERIFY_WRITE;
	int size = ((insn >> 19) & 3) == 3 ? 8 : 4;

	if ((regs->pc | regs->npc) & 3)
		return 0;

	/* Must access_ok() in all the necessary places. */
#define WINREG_ADDR(regnum) \
	((void __user *)(((unsigned long *)regs->u_regs[UREG_FP])+(regnum)))

	reg = (insn >> 25) & 0x1f;
	if (reg >= 16) {
		if (!access_ok(check, WINREG_ADDR(reg - 16), size))
			return -EFAULT;
	}
	reg = (insn >> 14) & 0x1f;
	if (reg >= 16) {
		if (!access_ok(check, WINREG_ADDR(reg - 16), size))
			return -EFAULT;
	}
	if (!(insn & 0x2000)) {
		reg = (insn & 0x1f);
		if (reg >= 16) {
			if (!access_ok(check, WINREG_ADDR(reg - 16), size))
				return -EFAULT;
		}
	}
#undef WINREG_ADDR
	return 0;
}

static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
{
	siginfo_t info;

	info.si_signo = SIGBUS;
	info.si_errno = 0;
	info.si_code = BUS_ADRALN;
	info.si_addr = (void __user *)safe_compute_effective_address(regs, insn);
	info.si_trapno = 0;
	send_sig_info(SIGBUS, &info, current);
}

asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
{
	enum direction dir;

	if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) ||
	   (((insn >> 30) & 3) != 3))
		goto kill_user;
	dir = decode_direction(insn);
	if(!ok_for_user(regs, insn, dir)) {
		goto kill_user;
	} else {
		int err, size = decode_access_size(insn);
		unsigned long addr;

		if(floating_point_load_or_store_p(insn)) {
			printk("User FPU load/store unaligned unsupported.\n");
			goto kill_user;
		}

		addr = compute_effective_address(regs, insn);
		perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0, regs, addr);
		switch(dir) {
		case load:
			err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
							 regs),
					  size, (unsigned long *) addr,
					  decode_signedness(insn));
			break;

		case store:
			err = do_int_store(((insn>>25)&0x1f), size,
					   (unsigned long *) addr, regs);
			break;

		case both:
			/*
			 * This was supported in 2.4. However, we question
			 * the value of SWAP instruction across word boundaries.
			 */
			printk("Unaligned SWAP unsupported.\n");
			err = -EFAULT;
			break;

		default:
			unaligned_panic("Impossible user unaligned trap.");
			goto out;
		}
		if (err)
			goto kill_user;
		else
			advance(regs);
		goto out;
	}

kill_user:
	user_mna_trap_fault(regs, insn);
out:
	;
}
Commit	Line	Data
88278ca2	1	/*
1da177e4 LT	2	* unaligned.c: Unaligned load/store trap handling with special
	3	* cases for the kernel to do them more quickly.
	4	*
	5	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	6	* Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	7	*/
	8
	9
	10	#include <linux/kernel.h>
	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/module.h>
	14	#include <asm/ptrace.h>
	15	#include <asm/processor.h>
	16	#include <asm/system.h>
	17	#include <asm/uaccess.h>
	18	#include <linux/smp.h>
	19	#include <linux/smp_lock.h>
121dd5f2	20	#include <linux/perf_event.h>
1da177e4 LT	21
	22	enum direction {
	23	load, /* ld, ldd, ldh, ldsh */
	24	store, /* st, std, sth, stsh */
	25	both, /* Swap, ldstub, etc. */
	26	fpload,
	27	fpstore,
	28	invalid,
	29	};
	30
1da177e4 LT	31	static inline enum direction decode_direction(unsigned int insn)
	32	{
	33	unsigned long tmp = (insn >> 21) & 1;
	34
	35	if(!tmp)
	36	return load;
	37	else {
	38	if(((insn>>19)&0x3f) == 15)
	39	return both;
	40	else
	41	return store;
	42	}
	43	}
	44
	45	/* 8 = double-word, 4 = word, 2 = half-word */
	46	static inline int decode_access_size(unsigned int insn)
	47	{
	48	insn = (insn >> 19) & 3;
	49
	50	if(!insn)
	51	return 4;
	52	else if(insn == 3)
	53	return 8;
	54	else if(insn == 2)
	55	return 2;
	56	else {
	57	printk("Impossible unaligned trap. insn=%08x\n", insn);
	58	die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
	59	return 4; /* just to keep gcc happy. */
	60	}
	61	}
	62
	63	/* 0x400000 = signed, 0 = unsigned */
	64	static inline int decode_signedness(unsigned int insn)
	65	{
	66	return (insn & 0x400000);
	67	}
	68
	69	static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
	70	unsigned int rd)
	71	{
	72	if(rs2 >= 16 \|\| rs1 >= 16 \|\| rd >= 16) {
	73	/* Wheee... */
	74	__asm__ __volatile__("save %sp, -0x40, %sp\n\t"
	75	"save %sp, -0x40, %sp\n\t"
	76	"save %sp, -0x40, %sp\n\t"
	77	"save %sp, -0x40, %sp\n\t"
	78	"save %sp, -0x40, %sp\n\t"
	79	"save %sp, -0x40, %sp\n\t"
	80	"save %sp, -0x40, %sp\n\t"
	81	"restore; restore; restore; restore;\n\t"
	82	"restore; restore; restore;\n\t");
	83	}
	84	}
	85
	86	static inline int sign_extend_imm13(int imm)
	87	{
	88	return imm << 19 >> 19;
	89	}
	90
	91	static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
	92	{
4d7b92ad	93	struct reg_window32 *win;
1da177e4 LT	94
	95	if(reg < 16)
	96	return (!reg ? 0 : regs->u_regs[reg]);
	97
	98	/* Ho hum, the slightly complicated case. */
4d7b92ad	99	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
1da177e4 LT	100	return win->locals[reg - 16]; /* yes, I know what this does... */
	101	}
	102
	103	static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
	104	{
4d7b92ad	105	struct reg_window32 __user *win;
1da177e4 LT	106	unsigned long ret;
	107
	108	if (reg < 16)
	109	return (!reg ? 0 : regs->u_regs[reg]);
	110
	111	/* Ho hum, the slightly complicated case. */
4d7b92ad	112	win = (struct reg_window32 __user *) regs->u_regs[UREG_FP];
1da177e4 LT	113
	114	if ((unsigned long)win & 3)
	115	return -1;
	116
	117	if (get_user(ret, &win->locals[reg - 16]))
	118	return -1;
	119
	120	return ret;
	121	}
	122
	123	static inline unsigned long fetch_reg_addr(unsigned int reg, struct pt_regs regs)
	124	{
4d7b92ad	125	struct reg_window32 *win;
1da177e4 LT	126
	127	if(reg < 16)
	128	return &regs->u_regs[reg];
4d7b92ad	129	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
1da177e4 LT	130	return &win->locals[reg - 16];
	131	}
	132
	133	static unsigned long compute_effective_address(struct pt_regs *regs,
	134	unsigned int insn)
	135	{
	136	unsigned int rs1 = (insn >> 14) & 0x1f;
	137	unsigned int rs2 = insn & 0x1f;
	138	unsigned int rd = (insn >> 25) & 0x1f;
	139
	140	if(insn & 0x2000) {
	141	maybe_flush_windows(rs1, 0, rd);
	142	return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	143	} else {
	144	maybe_flush_windows(rs1, rs2, rd);
	145	return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
	146	}
	147	}
	148
	149	unsigned long safe_compute_effective_address(struct pt_regs *regs,
	150	unsigned int insn)
	151	{
	152	unsigned int rs1 = (insn >> 14) & 0x1f;
	153	unsigned int rs2 = insn & 0x1f;
	154	unsigned int rd = (insn >> 25) & 0x1f;
	155
	156	if(insn & 0x2000) {
	157	maybe_flush_windows(rs1, 0, rd);
	158	return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	159	} else {
	160	maybe_flush_windows(rs1, rs2, rd);
	161	return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
	162	}
	163	}
	164
	165	/* This is just to make gcc think panic does return... */
	166	static void unaligned_panic(char *str)
	167	{
	168	panic(str);
	169	}
	170
f0e98c38 DM	171	/* una_asm.S */
	172	extern int do_int_load(unsigned long *dest_reg, int size,
	173	unsigned long *saddr, int is_signed);
	174	extern int __do_int_store(unsigned long *dst_addr, int size,
	175	unsigned long *src_val);
	176
	177	static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
	178	struct pt_regs *regs)
	179	{
	180	unsigned long zero[2] = { 0, 0 };
	181	unsigned long *src_val;
	182
	183	if (reg_num)
	184	src_val = fetch_reg_addr(reg_num, regs);
	185	else {
	186	src_val = &zero[0];
	187	if (size == 8)
	188	zero[1] = fetch_reg(1, regs);
	189	}
	190	return __do_int_store(dst_addr, size, src_val);
	191	}
1da177e4 LT	192
	193	extern void smp_capture(void);
	194	extern void smp_release(void);
	195
1da177e4 LT	196	static inline void advance(struct pt_regs *regs)
	197	{
	198	regs->pc = regs->npc;
	199	regs->npc += 4;
	200	}
	201
	202	static inline int floating_point_load_or_store_p(unsigned int insn)
	203	{
	204	return (insn >> 24) & 1;
	205	}
	206
	207	static inline int ok_for_kernel(unsigned int insn)
	208	{
	209	return !floating_point_load_or_store_p(insn);
	210	}
	211
f0e98c38	212	static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	213	{
	214	unsigned long g2 = regs->u_regs [UREG_G2];
	215	unsigned long fixup = search_extables_range(regs->pc, &g2);
	216
	217	if (!fixup) {
	218	unsigned long address = compute_effective_address(regs, insn);
	219	if(address < PAGE_SIZE) {
	220	printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
	221	} else
	222	printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
	223	printk(KERN_ALERT " at virtual address %08lx\n",address);
	224	printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
	225	(current->mm ? current->mm->context :
	226	current->active_mm->context));
	227	printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
	228	(current->mm ? (unsigned long) current->mm->pgd :
	229	(unsigned long) current->active_mm->pgd));
	230	die_if_kernel("Oops", regs);
	231	/* Not reached */
	232	}
	233	regs->pc = fixup;
	234	regs->npc = regs->pc + 4;
	235	regs->u_regs [UREG_G2] = g2;
	236	}
	237
	238	asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	239	{
	240	enum direction dir = decode_direction(insn);
	241	int size = decode_access_size(insn);
	242
	243	if(!ok_for_kernel(insn) \|\| dir == both) {
	244	printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n",
	245	regs->pc);
	246	unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store.");
1da177e4 LT	247	} else {
1da177e4 LT	248	unsigned long addr = compute_effective_address(regs, insn);
f0e98c38	249	int err;
1da177e4	250
121dd5f2	251	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0, regs, addr);
f0e98c38	252	switch (dir) {
1da177e4	253	case load:
f0e98c38 DM	254	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	255	regs),
	256	size, (unsigned long *) addr,
	257	decode_signedness(insn));
1da177e4 LT	258	break;
	259
	260	case store:
f0e98c38 DM	261	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	262	(unsigned long *) addr, regs);
1da177e4	263	break;
1da177e4 LT	264	default:
	265	panic("Impossible kernel unaligned trap.");
	266	/* Not reached... */
	267	}
f0e98c38 DM	268	if (err)
	269	kernel_mna_trap_fault(regs, insn);
	270	else
	271	advance(regs);
1da177e4 LT	272	}
	273	}
	274
	275	static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
	276	enum direction dir)
	277	{
	278	unsigned int reg;
	279	int check = (dir == load) ? VERIFY_READ : VERIFY_WRITE;
	280	int size = ((insn >> 19) & 3) == 3 ? 8 : 4;
	281
	282	if ((regs->pc \| regs->npc) & 3)
	283	return 0;
	284
	285	/* Must access_ok() in all the necessary places. */
	286	#define WINREG_ADDR(regnum) \
	287	((void __user )(((unsigned long )regs->u_regs[UREG_FP])+(regnum)))
	288
	289	reg = (insn >> 25) & 0x1f;
	290	if (reg >= 16) {
	291	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	292	return -EFAULT;
	293	}
	294	reg = (insn >> 14) & 0x1f;
	295	if (reg >= 16) {
	296	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	297	return -EFAULT;
	298	}
	299	if (!(insn & 0x2000)) {
	300	reg = (insn & 0x1f);
	301	if (reg >= 16) {
	302	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	303	return -EFAULT;
	304	}
	305	}
	306	#undef WINREG_ADDR
	307	return 0;
	308	}
	309
f0e98c38	310	static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	311	{
	312	siginfo_t info;
	313
	314	info.si_signo = SIGBUS;
	315	info.si_errno = 0;
	316	info.si_code = BUS_ADRALN;
	317	info.si_addr = (void __user *)safe_compute_effective_address(regs, insn);
	318	info.si_trapno = 0;
	319	send_sig_info(SIGBUS, &info, current);
	320	}
	321
	322	asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	323	{
	324	enum direction dir;
	325
1da177e4 LT	326	if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) \|\|
	327	(((insn >> 30) & 3) != 3))
	328	goto kill_user;
	329	dir = decode_direction(insn);
	330	if(!ok_for_user(regs, insn, dir)) {
	331	goto kill_user;
	332	} else {
f0e98c38	333	int err, size = decode_access_size(insn);
1da177e4 LT	334	unsigned long addr;
	335
	336	if(floating_point_load_or_store_p(insn)) {
	337	printk("User FPU load/store unaligned unsupported.\n");
	338	goto kill_user;
	339	}
	340
	341	addr = compute_effective_address(regs, insn);
121dd5f2	342	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, 0, regs, addr);
1da177e4 LT	343	switch(dir) {
1da177e4 LT	344	case load:
f0e98c38 DM	345	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	346	regs),
	347	size, (unsigned long *) addr,
	348	decode_signedness(insn));
1da177e4 LT	349	break;
	350
	351	case store:
f0e98c38 DM	352	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	353	(unsigned long *) addr, regs);
1da177e4 LT	354	break;
	355
	356	case both:
1da177e4 LT	357	/*
	358	* This was supported in 2.4. However, we question
	359	* the value of SWAP instruction across word boundaries.
	360	*/
	361	printk("Unaligned SWAP unsupported.\n");
f0e98c38	362	err = -EFAULT;
1da177e4 LT	363	break;
	364
	365	default:
	366	unaligned_panic("Impossible user unaligned trap.");
1da177e4 LT	367	goto out;
1da177e4 LT	368	}
f0e98c38 DM	369	if (err)
	370	goto kill_user;
	371	else
	372	advance(regs);
1da177e4 LT	373	goto out;
	374	}
	375
	376	kill_user:
	377	user_mna_trap_fault(regs, insn);
	378	out:
b19f8200	379	;
1da177e4	380	}