[mirror_ubuntu-artful-kernel.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 <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/smp.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, 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, 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>
1da177e4 LT	13	#include <asm/ptrace.h>
	14	#include <asm/processor.h>
	15	#include <asm/system.h>
	16	#include <asm/uaccess.h>
	17	#include <linux/smp.h>
121dd5f2	18	#include <linux/perf_event.h>
1da177e4 LT	19
	20	enum direction {
	21	load, /* ld, ldd, ldh, ldsh */
	22	store, /* st, std, sth, stsh */
	23	both, /* Swap, ldstub, etc. */
	24	fpload,
	25	fpstore,
	26	invalid,
	27	};
	28
1da177e4 LT	29	static inline enum direction decode_direction(unsigned int insn)
	30	{
	31	unsigned long tmp = (insn >> 21) & 1;
	32
	33	if(!tmp)
	34	return load;
	35	else {
	36	if(((insn>>19)&0x3f) == 15)
	37	return both;
	38	else
	39	return store;
	40	}
	41	}
	42
	43	/* 8 = double-word, 4 = word, 2 = half-word */
	44	static inline int decode_access_size(unsigned int insn)
	45	{
	46	insn = (insn >> 19) & 3;
	47
	48	if(!insn)
	49	return 4;
	50	else if(insn == 3)
	51	return 8;
	52	else if(insn == 2)
	53	return 2;
	54	else {
	55	printk("Impossible unaligned trap. insn=%08x\n", insn);
	56	die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
	57	return 4; /* just to keep gcc happy. */
	58	}
	59	}
	60
	61	/* 0x400000 = signed, 0 = unsigned */
	62	static inline int decode_signedness(unsigned int insn)
	63	{
	64	return (insn & 0x400000);
	65	}
	66
	67	static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
	68	unsigned int rd)
	69	{
	70	if(rs2 >= 16 \|\| rs1 >= 16 \|\| rd >= 16) {
	71	/* Wheee... */
	72	__asm__ __volatile__("save %sp, -0x40, %sp\n\t"
	73	"save %sp, -0x40, %sp\n\t"
	74	"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	"restore; restore; restore; restore;\n\t"
	80	"restore; restore; restore;\n\t");
	81	}
	82	}
	83
	84	static inline int sign_extend_imm13(int imm)
	85	{
	86	return imm << 19 >> 19;
	87	}
	88
	89	static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
	90	{
4d7b92ad	91	struct reg_window32 *win;
1da177e4 LT	92
	93	if(reg < 16)
	94	return (!reg ? 0 : regs->u_regs[reg]);
	95
	96	/* Ho hum, the slightly complicated case. */
4d7b92ad	97	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
1da177e4 LT	98	return win->locals[reg - 16]; /* yes, I know what this does... */
	99	}
	100
	101	static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
	102	{
4d7b92ad	103	struct reg_window32 __user *win;
1da177e4 LT	104	unsigned long ret;
	105
	106	if (reg < 16)
	107	return (!reg ? 0 : regs->u_regs[reg]);
	108
	109	/* Ho hum, the slightly complicated case. */
4d7b92ad	110	win = (struct reg_window32 __user *) regs->u_regs[UREG_FP];
1da177e4 LT	111
	112	if ((unsigned long)win & 3)
	113	return -1;
	114
	115	if (get_user(ret, &win->locals[reg - 16]))
	116	return -1;
	117
	118	return ret;
	119	}
	120
	121	static inline unsigned long fetch_reg_addr(unsigned int reg, struct pt_regs regs)
	122	{
4d7b92ad	123	struct reg_window32 *win;
1da177e4 LT	124
	125	if(reg < 16)
	126	return &regs->u_regs[reg];
4d7b92ad	127	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
1da177e4 LT	128	return &win->locals[reg - 16];
	129	}
	130
	131	static unsigned long compute_effective_address(struct pt_regs *regs,
	132	unsigned int insn)
	133	{
	134	unsigned int rs1 = (insn >> 14) & 0x1f;
	135	unsigned int rs2 = insn & 0x1f;
	136	unsigned int rd = (insn >> 25) & 0x1f;
	137
	138	if(insn & 0x2000) {
	139	maybe_flush_windows(rs1, 0, rd);
	140	return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	141	} else {
	142	maybe_flush_windows(rs1, rs2, rd);
	143	return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
	144	}
	145	}
	146
	147	unsigned long safe_compute_effective_address(struct pt_regs *regs,
	148	unsigned int insn)
	149	{
	150	unsigned int rs1 = (insn >> 14) & 0x1f;
	151	unsigned int rs2 = insn & 0x1f;
	152	unsigned int rd = (insn >> 25) & 0x1f;
	153
	154	if(insn & 0x2000) {
	155	maybe_flush_windows(rs1, 0, rd);
	156	return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	157	} else {
	158	maybe_flush_windows(rs1, rs2, rd);
	159	return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
	160	}
	161	}
	162
	163	/* This is just to make gcc think panic does return... */
	164	static void unaligned_panic(char *str)
	165	{
	166	panic(str);
	167	}
	168
f0e98c38 DM	169	/* una_asm.S */
	170	extern int do_int_load(unsigned long *dest_reg, int size,
	171	unsigned long *saddr, int is_signed);
	172	extern int __do_int_store(unsigned long *dst_addr, int size,
	173	unsigned long *src_val);
	174
	175	static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
	176	struct pt_regs *regs)
	177	{
	178	unsigned long zero[2] = { 0, 0 };
	179	unsigned long *src_val;
	180
	181	if (reg_num)
	182	src_val = fetch_reg_addr(reg_num, regs);
	183	else {
	184	src_val = &zero[0];
	185	if (size == 8)
	186	zero[1] = fetch_reg(1, regs);
	187	}
	188	return __do_int_store(dst_addr, size, src_val);
	189	}
1da177e4 LT	190
	191	extern void smp_capture(void);
	192	extern void smp_release(void);
	193
1da177e4 LT	194	static inline void advance(struct pt_regs *regs)
	195	{
	196	regs->pc = regs->npc;
	197	regs->npc += 4;
	198	}
	199
	200	static inline int floating_point_load_or_store_p(unsigned int insn)
	201	{
	202	return (insn >> 24) & 1;
	203	}
	204
	205	static inline int ok_for_kernel(unsigned int insn)
	206	{
	207	return !floating_point_load_or_store_p(insn);
	208	}
	209
f0e98c38	210	static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	211	{
	212	unsigned long g2 = regs->u_regs [UREG_G2];
	213	unsigned long fixup = search_extables_range(regs->pc, &g2);
	214
	215	if (!fixup) {
	216	unsigned long address = compute_effective_address(regs, insn);
	217	if(address < PAGE_SIZE) {
	218	printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
	219	} else
	220	printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
	221	printk(KERN_ALERT " at virtual address %08lx\n",address);
	222	printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
	223	(current->mm ? current->mm->context :
	224	current->active_mm->context));
	225	printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
	226	(current->mm ? (unsigned long) current->mm->pgd :
	227	(unsigned long) current->active_mm->pgd));
	228	die_if_kernel("Oops", regs);
	229	/* Not reached */
	230	}
	231	regs->pc = fixup;
	232	regs->npc = regs->pc + 4;
	233	regs->u_regs [UREG_G2] = g2;
	234	}
	235
	236	asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	237	{
	238	enum direction dir = decode_direction(insn);
	239	int size = decode_access_size(insn);
	240
	241	if(!ok_for_kernel(insn) \|\| dir == both) {
	242	printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n",
	243	regs->pc);
	244	unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store.");
1da177e4 LT	245	} else {
1da177e4 LT	246	unsigned long addr = compute_effective_address(regs, insn);
f0e98c38	247	int err;
1da177e4	248
a8b0ca17	249	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
f0e98c38	250	switch (dir) {
1da177e4	251	case load:
f0e98c38 DM	252	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	253	regs),
	254	size, (unsigned long *) addr,
	255	decode_signedness(insn));
1da177e4 LT	256	break;
	257
	258	case store:
f0e98c38 DM	259	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	260	(unsigned long *) addr, regs);
1da177e4	261	break;
1da177e4 LT	262	default:
	263	panic("Impossible kernel unaligned trap.");
	264	/* Not reached... */
	265	}
f0e98c38 DM	266	if (err)
	267	kernel_mna_trap_fault(regs, insn);
	268	else
	269	advance(regs);
1da177e4 LT	270	}
	271	}
	272
	273	static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
	274	enum direction dir)
	275	{
	276	unsigned int reg;
	277	int check = (dir == load) ? VERIFY_READ : VERIFY_WRITE;
	278	int size = ((insn >> 19) & 3) == 3 ? 8 : 4;
	279
	280	if ((regs->pc \| regs->npc) & 3)
	281	return 0;
	282
	283	/* Must access_ok() in all the necessary places. */
	284	#define WINREG_ADDR(regnum) \
	285	((void __user )(((unsigned long )regs->u_regs[UREG_FP])+(regnum)))
	286
	287	reg = (insn >> 25) & 0x1f;
	288	if (reg >= 16) {
	289	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	290	return -EFAULT;
	291	}
	292	reg = (insn >> 14) & 0x1f;
	293	if (reg >= 16) {
	294	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	295	return -EFAULT;
	296	}
	297	if (!(insn & 0x2000)) {
	298	reg = (insn & 0x1f);
	299	if (reg >= 16) {
	300	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	301	return -EFAULT;
	302	}
	303	}
	304	#undef WINREG_ADDR
	305	return 0;
	306	}
	307
f0e98c38	308	static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	309	{
	310	siginfo_t info;
	311
	312	info.si_signo = SIGBUS;
	313	info.si_errno = 0;
	314	info.si_code = BUS_ADRALN;
	315	info.si_addr = (void __user *)safe_compute_effective_address(regs, insn);
	316	info.si_trapno = 0;
	317	send_sig_info(SIGBUS, &info, current);
	318	}
	319
	320	asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	321	{
	322	enum direction dir;
	323
1da177e4 LT	324	if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) \|\|
	325	(((insn >> 30) & 3) != 3))
	326	goto kill_user;
	327	dir = decode_direction(insn);
	328	if(!ok_for_user(regs, insn, dir)) {
	329	goto kill_user;
	330	} else {
f0e98c38	331	int err, size = decode_access_size(insn);
1da177e4 LT	332	unsigned long addr;
	333
	334	if(floating_point_load_or_store_p(insn)) {
	335	printk("User FPU load/store unaligned unsupported.\n");
	336	goto kill_user;
	337	}
	338
	339	addr = compute_effective_address(regs, insn);
a8b0ca17	340	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
1da177e4 LT	341	switch(dir) {
1da177e4 LT	342	case load:
f0e98c38 DM	343	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	344	regs),
	345	size, (unsigned long *) addr,
	346	decode_signedness(insn));
1da177e4 LT	347	break;
	348
	349	case store:
f0e98c38 DM	350	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	351	(unsigned long *) addr, regs);
1da177e4 LT	352	break;
	353
	354	case both:
1da177e4 LT	355	/*
	356	* This was supported in 2.4. However, we question
	357	* the value of SWAP instruction across word boundaries.
	358	*/
	359	printk("Unaligned SWAP unsupported.\n");
f0e98c38	360	err = -EFAULT;
1da177e4 LT	361	break;
	362
	363	default:
	364	unaligned_panic("Impossible user unaligned trap.");
1da177e4 LT	365	goto out;
1da177e4 LT	366	}
f0e98c38 DM	367	if (err)
	368	goto kill_user;
	369	else
	370	advance(regs);
1da177e4 LT	371	goto out;
	372	}
	373
	374	kill_user:
	375	user_mna_trap_fault(regs, insn);
	376	out:
b19f8200	377	;
1da177e4	378	}