[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/signal.h>
#include <linux/mm.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <linux/smp.h>
#include <linux/perf_event.h>

#include <asm/setup.h>

#include "kernel.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("%s", 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>
3f07c014	11	#include <linux/sched/signal.h>
1da177e4	12	#include <linux/mm.h>
1da177e4 LT	13	#include <asm/ptrace.h>
1da177e4 LT	14	#include <asm/processor.h>
7c0f6ba6	15	#include <linux/uaccess.h>
1da177e4	16	#include <linux/smp.h>
121dd5f2	17	#include <linux/perf_event.h>
1da177e4	18
9edfae3f SR	19	#include <asm/setup.h>
	20
	21	#include "kernel.h"
	22
1da177e4 LT	23	enum direction {
	24	load, /* ld, ldd, ldh, ldsh */
	25	store, /* st, std, sth, stsh */
	26	both, /* Swap, ldstub, etc. */
	27	fpload,
	28	fpstore,
	29	invalid,
	30	};
	31
1da177e4 LT	32	static inline enum direction decode_direction(unsigned int insn)
	33	{
	34	unsigned long tmp = (insn >> 21) & 1;
	35
	36	if(!tmp)
	37	return load;
	38	else {
	39	if(((insn>>19)&0x3f) == 15)
	40	return both;
	41	else
	42	return store;
	43	}
	44	}
	45
	46	/* 8 = double-word, 4 = word, 2 = half-word */
	47	static inline int decode_access_size(unsigned int insn)
	48	{
	49	insn = (insn >> 19) & 3;
	50
	51	if(!insn)
	52	return 4;
	53	else if(insn == 3)
	54	return 8;
	55	else if(insn == 2)
	56	return 2;
	57	else {
	58	printk("Impossible unaligned trap. insn=%08x\n", insn);
	59	die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
	60	return 4; /* just to keep gcc happy. */
	61	}
	62	}
	63
	64	/* 0x400000 = signed, 0 = unsigned */
	65	static inline int decode_signedness(unsigned int insn)
	66	{
	67	return (insn & 0x400000);
	68	}
	69
	70	static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
	71	unsigned int rd)
	72	{
	73	if(rs2 >= 16 \|\| rs1 >= 16 \|\| rd >= 16) {
	74	/* Wheee... */
	75	__asm__ __volatile__("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	"save %sp, -0x40, %sp\n\t"
	82	"restore; restore; restore; restore;\n\t"
	83	"restore; restore; restore;\n\t");
	84	}
	85	}
	86
	87	static inline int sign_extend_imm13(int imm)
	88	{
	89	return imm << 19 >> 19;
	90	}
	91
	92	static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
	93	{
4d7b92ad	94	struct reg_window32 *win;
1da177e4 LT	95
	96	if(reg < 16)
	97	return (!reg ? 0 : regs->u_regs[reg]);
	98
	99	/* Ho hum, the slightly complicated case. */
4d7b92ad	100	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
1da177e4 LT	101	return win->locals[reg - 16]; /* yes, I know what this does... */
	102	}
	103
	104	static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
	105	{
4d7b92ad	106	struct reg_window32 __user *win;
1da177e4 LT	107	unsigned long ret;
	108
	109	if (reg < 16)
	110	return (!reg ? 0 : regs->u_regs[reg]);
	111
	112	/* Ho hum, the slightly complicated case. */
4d7b92ad	113	win = (struct reg_window32 __user *) regs->u_regs[UREG_FP];
1da177e4 LT	114
	115	if ((unsigned long)win & 3)
	116	return -1;
	117
	118	if (get_user(ret, &win->locals[reg - 16]))
	119	return -1;
	120
	121	return ret;
	122	}
	123
	124	static inline unsigned long fetch_reg_addr(unsigned int reg, struct pt_regs regs)
	125	{
4d7b92ad	126	struct reg_window32 *win;
1da177e4 LT	127
	128	if(reg < 16)
	129	return &regs->u_regs[reg];
4d7b92ad	130	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
1da177e4 LT	131	return &win->locals[reg - 16];
	132	}
	133
	134	static unsigned long compute_effective_address(struct pt_regs *regs,
	135	unsigned int insn)
	136	{
	137	unsigned int rs1 = (insn >> 14) & 0x1f;
	138	unsigned int rs2 = insn & 0x1f;
	139	unsigned int rd = (insn >> 25) & 0x1f;
	140
	141	if(insn & 0x2000) {
	142	maybe_flush_windows(rs1, 0, rd);
	143	return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	144	} else {
	145	maybe_flush_windows(rs1, rs2, rd);
	146	return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
	147	}
	148	}
	149
	150	unsigned long safe_compute_effective_address(struct pt_regs *regs,
	151	unsigned int insn)
	152	{
	153	unsigned int rs1 = (insn >> 14) & 0x1f;
	154	unsigned int rs2 = insn & 0x1f;
	155	unsigned int rd = (insn >> 25) & 0x1f;
	156
	157	if(insn & 0x2000) {
	158	maybe_flush_windows(rs1, 0, rd);
	159	return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	160	} else {
	161	maybe_flush_windows(rs1, rs2, rd);
	162	return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
	163	}
	164	}
	165
	166	/* This is just to make gcc think panic does return... */
	167	static void unaligned_panic(char *str)
	168	{
e7fbaf01	169	panic("%s", str);
1da177e4 LT	170	}
1da177e4 LT	171
f0e98c38 DM	172	/* una_asm.S */
	173	extern int do_int_load(unsigned long *dest_reg, int size,
	174	unsigned long *saddr, int is_signed);
	175	extern int __do_int_store(unsigned long *dst_addr, int size,
	176	unsigned long *src_val);
	177
	178	static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
	179	struct pt_regs *regs)
	180	{
	181	unsigned long zero[2] = { 0, 0 };
	182	unsigned long *src_val;
	183
	184	if (reg_num)
	185	src_val = fetch_reg_addr(reg_num, regs);
	186	else {
	187	src_val = &zero[0];
	188	if (size == 8)
	189	zero[1] = fetch_reg(1, regs);
	190	}
	191	return __do_int_store(dst_addr, size, src_val);
	192	}
1da177e4 LT	193
	194	extern void smp_capture(void);
	195	extern void smp_release(void);
	196
1da177e4 LT	197	static inline void advance(struct pt_regs *regs)
	198	{
	199	regs->pc = regs->npc;
	200	regs->npc += 4;
	201	}
	202
	203	static inline int floating_point_load_or_store_p(unsigned int insn)
	204	{
	205	return (insn >> 24) & 1;
	206	}
	207
	208	static inline int ok_for_kernel(unsigned int insn)
	209	{
	210	return !floating_point_load_or_store_p(insn);
	211	}
	212
f0e98c38	213	static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	214	{
	215	unsigned long g2 = regs->u_regs [UREG_G2];
	216	unsigned long fixup = search_extables_range(regs->pc, &g2);
	217
	218	if (!fixup) {
	219	unsigned long address = compute_effective_address(regs, insn);
	220	if(address < PAGE_SIZE) {
	221	printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
	222	} else
	223	printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
	224	printk(KERN_ALERT " at virtual address %08lx\n",address);
	225	printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
	226	(current->mm ? current->mm->context :
	227	current->active_mm->context));
	228	printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
	229	(current->mm ? (unsigned long) current->mm->pgd :
	230	(unsigned long) current->active_mm->pgd));
	231	die_if_kernel("Oops", regs);
	232	/* Not reached */
	233	}
	234	regs->pc = fixup;
	235	regs->npc = regs->pc + 4;
	236	regs->u_regs [UREG_G2] = g2;
	237	}
	238
	239	asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	240	{
	241	enum direction dir = decode_direction(insn);
	242	int size = decode_access_size(insn);
	243
	244	if(!ok_for_kernel(insn) \|\| dir == both) {
	245	printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n",
	246	regs->pc);
	247	unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store.");
1da177e4 LT	248	} else {
1da177e4 LT	249	unsigned long addr = compute_effective_address(regs, insn);
f0e98c38	250	int err;
1da177e4	251
a8b0ca17	252	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
f0e98c38	253	switch (dir) {
1da177e4	254	case load:
f0e98c38 DM	255	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	256	regs),
	257	size, (unsigned long *) addr,
	258	decode_signedness(insn));
1da177e4 LT	259	break;
	260
	261	case store:
f0e98c38 DM	262	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	263	(unsigned long *) addr, regs);
1da177e4	264	break;
1da177e4 LT	265	default:
	266	panic("Impossible kernel unaligned trap.");
	267	/* Not reached... */
	268	}
f0e98c38 DM	269	if (err)
	270	kernel_mna_trap_fault(regs, insn);
	271	else
	272	advance(regs);
1da177e4 LT	273	}
	274	}
	275
	276	static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
	277	enum direction dir)
	278	{
	279	unsigned int reg;
	280	int check = (dir == load) ? VERIFY_READ : VERIFY_WRITE;
	281	int size = ((insn >> 19) & 3) == 3 ? 8 : 4;
	282
	283	if ((regs->pc \| regs->npc) & 3)
	284	return 0;
	285
	286	/* Must access_ok() in all the necessary places. */
	287	#define WINREG_ADDR(regnum) \
	288	((void __user )(((unsigned long )regs->u_regs[UREG_FP])+(regnum)))
	289
	290	reg = (insn >> 25) & 0x1f;
	291	if (reg >= 16) {
	292	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	293	return -EFAULT;
	294	}
	295	reg = (insn >> 14) & 0x1f;
	296	if (reg >= 16) {
	297	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	298	return -EFAULT;
	299	}
	300	if (!(insn & 0x2000)) {
	301	reg = (insn & 0x1f);
	302	if (reg >= 16) {
	303	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	304	return -EFAULT;
	305	}
	306	}
	307	#undef WINREG_ADDR
	308	return 0;
	309	}
	310
f0e98c38	311	static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	312	{
	313	siginfo_t info;
	314
	315	info.si_signo = SIGBUS;
	316	info.si_errno = 0;
	317	info.si_code = BUS_ADRALN;
	318	info.si_addr = (void __user *)safe_compute_effective_address(regs, insn);
	319	info.si_trapno = 0;
	320	send_sig_info(SIGBUS, &info, current);
	321	}
	322
	323	asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	324	{
	325	enum direction dir;
	326
1da177e4 LT	327	if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) \|\|
	328	(((insn >> 30) & 3) != 3))
	329	goto kill_user;
	330	dir = decode_direction(insn);
	331	if(!ok_for_user(regs, insn, dir)) {
	332	goto kill_user;
	333	} else {
f0e98c38	334	int err, size = decode_access_size(insn);
1da177e4 LT	335	unsigned long addr;
	336
	337	if(floating_point_load_or_store_p(insn)) {
	338	printk("User FPU load/store unaligned unsupported.\n");
	339	goto kill_user;
	340	}
	341
	342	addr = compute_effective_address(regs, insn);
a8b0ca17	343	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
1da177e4 LT	344	switch(dir) {
1da177e4 LT	345	case load:
f0e98c38 DM	346	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	347	regs),
	348	size, (unsigned long *) addr,
	349	decode_signedness(insn));
1da177e4 LT	350	break;
	351
	352	case store:
f0e98c38 DM	353	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	354	(unsigned long *) addr, regs);
1da177e4 LT	355	break;
	356
	357	case both:
1da177e4 LT	358	/*
	359	* This was supported in 2.4. However, we question
	360	* the value of SWAP instruction across word boundaries.
	361	*/
	362	printk("Unaligned SWAP unsupported.\n");
f0e98c38	363	err = -EFAULT;
1da177e4 LT	364	break;
	365
	366	default:
	367	unaligned_panic("Impossible user unaligned trap.");
1da177e4 LT	368	goto out;
1da177e4 LT	369	}
f0e98c38 DM	370	if (err)
	371	goto kill_user;
	372	else
	373	advance(regs);
1da177e4 LT	374	goto out;
	375	}
	376
	377	kill_user:
	378	user_mna_trap_fault(regs, insn);
	379	out:
b19f8200	380	;
1da177e4	381	}