[thirdparty/kernel/linux.git] / arch / sparc / kernel / unaligned_32.c

// SPDX-License-Identifier: GPL-2.0
/*
 * 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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
88278ca2	2	/*
1da177e4 LT	3	* unaligned.c: Unaligned load/store trap handling with special
	4	* cases for the kernel to do them more quickly.
	5	*
	6	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	7	* Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	8	*/
	9
	10
	11	#include <linux/kernel.h>
3f07c014	12	#include <linux/sched/signal.h>
1da177e4	13	#include <linux/mm.h>
1da177e4 LT	14	#include <asm/ptrace.h>
1da177e4 LT	15	#include <asm/processor.h>
7c0f6ba6	16	#include <linux/uaccess.h>
1da177e4	17	#include <linux/smp.h>
121dd5f2	18	#include <linux/perf_event.h>
1da177e4	19
9edfae3f SR	20	#include <asm/setup.h>
	21
	22	#include "kernel.h"
	23
1da177e4 LT	24	enum direction {
	25	load, /* ld, ldd, ldh, ldsh */
	26	store, /* st, std, sth, stsh */
	27	both, /* Swap, ldstub, etc. */
	28	fpload,
	29	fpstore,
	30	invalid,
	31	};
	32
1da177e4 LT	33	static inline enum direction decode_direction(unsigned int insn)
	34	{
	35	unsigned long tmp = (insn >> 21) & 1;
	36
	37	if(!tmp)
	38	return load;
	39	else {
	40	if(((insn>>19)&0x3f) == 15)
	41	return both;
	42	else
	43	return store;
	44	}
	45	}
	46
	47	/* 8 = double-word, 4 = word, 2 = half-word */
	48	static inline int decode_access_size(unsigned int insn)
	49	{
	50	insn = (insn >> 19) & 3;
	51
	52	if(!insn)
	53	return 4;
	54	else if(insn == 3)
	55	return 8;
	56	else if(insn == 2)
	57	return 2;
	58	else {
	59	printk("Impossible unaligned trap. insn=%08x\n", insn);
	60	die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
	61	return 4; /* just to keep gcc happy. */
	62	}
	63	}
	64
	65	/* 0x400000 = signed, 0 = unsigned */
	66	static inline int decode_signedness(unsigned int insn)
	67	{
	68	return (insn & 0x400000);
	69	}
	70
	71	static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
	72	unsigned int rd)
	73	{
	74	if(rs2 >= 16 \|\| rs1 >= 16 \|\| rd >= 16) {
	75	/* Wheee... */
	76	__asm__ __volatile__("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	"save %sp, -0x40, %sp\n\t"
	83	"restore; restore; restore; restore;\n\t"
	84	"restore; restore; restore;\n\t");
	85	}
	86	}
	87
	88	static inline int sign_extend_imm13(int imm)
	89	{
	90	return imm << 19 >> 19;
	91	}
	92
	93	static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
	94	{
4d7b92ad	95	struct reg_window32 *win;
1da177e4 LT	96
	97	if(reg < 16)
	98	return (!reg ? 0 : regs->u_regs[reg]);
	99
	100	/* Ho hum, the slightly complicated case. */
4d7b92ad	101	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
1da177e4 LT	102	return win->locals[reg - 16]; /* yes, I know what this does... */
	103	}
	104
	105	static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
	106	{
4d7b92ad	107	struct reg_window32 __user *win;
1da177e4 LT	108	unsigned long ret;
	109
	110	if (reg < 16)
	111	return (!reg ? 0 : regs->u_regs[reg]);
	112
	113	/* Ho hum, the slightly complicated case. */
4d7b92ad	114	win = (struct reg_window32 __user *) regs->u_regs[UREG_FP];
1da177e4 LT	115
	116	if ((unsigned long)win & 3)
	117	return -1;
	118
	119	if (get_user(ret, &win->locals[reg - 16]))
	120	return -1;
	121
	122	return ret;
	123	}
	124
	125	static inline unsigned long fetch_reg_addr(unsigned int reg, struct pt_regs regs)
	126	{
4d7b92ad	127	struct reg_window32 *win;
1da177e4 LT	128
	129	if(reg < 16)
	130	return &regs->u_regs[reg];
4d7b92ad	131	win = (struct reg_window32 *) regs->u_regs[UREG_FP];
1da177e4 LT	132	return &win->locals[reg - 16];
	133	}
	134
	135	static unsigned long compute_effective_address(struct pt_regs *regs,
	136	unsigned int insn)
	137	{
	138	unsigned int rs1 = (insn >> 14) & 0x1f;
	139	unsigned int rs2 = insn & 0x1f;
	140	unsigned int rd = (insn >> 25) & 0x1f;
	141
	142	if(insn & 0x2000) {
	143	maybe_flush_windows(rs1, 0, rd);
	144	return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	145	} else {
	146	maybe_flush_windows(rs1, rs2, rd);
	147	return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
	148	}
	149	}
	150
	151	unsigned long safe_compute_effective_address(struct pt_regs *regs,
	152	unsigned int insn)
	153	{
	154	unsigned int rs1 = (insn >> 14) & 0x1f;
	155	unsigned int rs2 = insn & 0x1f;
	156	unsigned int rd = (insn >> 25) & 0x1f;
	157
	158	if(insn & 0x2000) {
	159	maybe_flush_windows(rs1, 0, rd);
	160	return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
	161	} else {
	162	maybe_flush_windows(rs1, rs2, rd);
	163	return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
	164	}
	165	}
	166
	167	/* This is just to make gcc think panic does return... */
	168	static void unaligned_panic(char *str)
	169	{
e7fbaf01	170	panic("%s", str);
1da177e4 LT	171	}
1da177e4 LT	172
f0e98c38 DM	173	/* una_asm.S */
	174	extern int do_int_load(unsigned long *dest_reg, int size,
	175	unsigned long *saddr, int is_signed);
	176	extern int __do_int_store(unsigned long *dst_addr, int size,
	177	unsigned long *src_val);
	178
	179	static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
	180	struct pt_regs *regs)
	181	{
	182	unsigned long zero[2] = { 0, 0 };
	183	unsigned long *src_val;
	184
	185	if (reg_num)
	186	src_val = fetch_reg_addr(reg_num, regs);
	187	else {
	188	src_val = &zero[0];
	189	if (size == 8)
	190	zero[1] = fetch_reg(1, regs);
	191	}
	192	return __do_int_store(dst_addr, size, src_val);
	193	}
1da177e4 LT	194
	195	extern void smp_capture(void);
	196	extern void smp_release(void);
	197
1da177e4 LT	198	static inline void advance(struct pt_regs *regs)
	199	{
	200	regs->pc = regs->npc;
	201	regs->npc += 4;
	202	}
	203
	204	static inline int floating_point_load_or_store_p(unsigned int insn)
	205	{
	206	return (insn >> 24) & 1;
	207	}
	208
	209	static inline int ok_for_kernel(unsigned int insn)
	210	{
	211	return !floating_point_load_or_store_p(insn);
	212	}
	213
f0e98c38	214	static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	215	{
	216	unsigned long g2 = regs->u_regs [UREG_G2];
	217	unsigned long fixup = search_extables_range(regs->pc, &g2);
	218
	219	if (!fixup) {
	220	unsigned long address = compute_effective_address(regs, insn);
	221	if(address < PAGE_SIZE) {
	222	printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
	223	} else
	224	printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
	225	printk(KERN_ALERT " at virtual address %08lx\n",address);
	226	printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
	227	(current->mm ? current->mm->context :
	228	current->active_mm->context));
	229	printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
	230	(current->mm ? (unsigned long) current->mm->pgd :
	231	(unsigned long) current->active_mm->pgd));
	232	die_if_kernel("Oops", regs);
	233	/* Not reached */
	234	}
	235	regs->pc = fixup;
	236	regs->npc = regs->pc + 4;
	237	regs->u_regs [UREG_G2] = g2;
	238	}
	239
	240	asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	241	{
	242	enum direction dir = decode_direction(insn);
	243	int size = decode_access_size(insn);
	244
	245	if(!ok_for_kernel(insn) \|\| dir == both) {
	246	printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n",
	247	regs->pc);
	248	unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store.");
1da177e4 LT	249	} else {
1da177e4 LT	250	unsigned long addr = compute_effective_address(regs, insn);
f0e98c38	251	int err;
1da177e4	252
a8b0ca17	253	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
f0e98c38	254	switch (dir) {
1da177e4	255	case load:
f0e98c38 DM	256	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	257	regs),
	258	size, (unsigned long *) addr,
	259	decode_signedness(insn));
1da177e4 LT	260	break;
	261
	262	case store:
f0e98c38 DM	263	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	264	(unsigned long *) addr, regs);
1da177e4	265	break;
1da177e4 LT	266	default:
	267	panic("Impossible kernel unaligned trap.");
	268	/* Not reached... */
	269	}
f0e98c38 DM	270	if (err)
	271	kernel_mna_trap_fault(regs, insn);
	272	else
	273	advance(regs);
1da177e4 LT	274	}
	275	}
	276
	277	static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
	278	enum direction dir)
	279	{
	280	unsigned int reg;
	281	int check = (dir == load) ? VERIFY_READ : VERIFY_WRITE;
	282	int size = ((insn >> 19) & 3) == 3 ? 8 : 4;
	283
	284	if ((regs->pc \| regs->npc) & 3)
	285	return 0;
	286
	287	/* Must access_ok() in all the necessary places. */
	288	#define WINREG_ADDR(regnum) \
	289	((void __user )(((unsigned long )regs->u_regs[UREG_FP])+(regnum)))
	290
	291	reg = (insn >> 25) & 0x1f;
	292	if (reg >= 16) {
	293	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	294	return -EFAULT;
	295	}
	296	reg = (insn >> 14) & 0x1f;
	297	if (reg >= 16) {
	298	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	299	return -EFAULT;
	300	}
	301	if (!(insn & 0x2000)) {
	302	reg = (insn & 0x1f);
	303	if (reg >= 16) {
	304	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	305	return -EFAULT;
	306	}
	307	}
	308	#undef WINREG_ADDR
	309	return 0;
	310	}
	311
f0e98c38	312	static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	313	{
	314	siginfo_t info;
	315
	316	info.si_signo = SIGBUS;
	317	info.si_errno = 0;
	318	info.si_code = BUS_ADRALN;
	319	info.si_addr = (void __user *)safe_compute_effective_address(regs, insn);
	320	info.si_trapno = 0;
	321	send_sig_info(SIGBUS, &info, current);
	322	}
	323
	324	asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	325	{
	326	enum direction dir;
	327
1da177e4 LT	328	if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) \|\|
	329	(((insn >> 30) & 3) != 3))
	330	goto kill_user;
	331	dir = decode_direction(insn);
	332	if(!ok_for_user(regs, insn, dir)) {
	333	goto kill_user;
	334	} else {
f0e98c38	335	int err, size = decode_access_size(insn);
1da177e4 LT	336	unsigned long addr;
	337
	338	if(floating_point_load_or_store_p(insn)) {
	339	printk("User FPU load/store unaligned unsupported.\n");
	340	goto kill_user;
	341	}
	342
	343	addr = compute_effective_address(regs, insn);
a8b0ca17	344	perf_sw_event(PERF_COUNT_SW_ALIGNMENT_FAULTS, 1, regs, addr);
1da177e4 LT	345	switch(dir) {
1da177e4 LT	346	case load:
f0e98c38 DM	347	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	348	regs),
	349	size, (unsigned long *) addr,
	350	decode_signedness(insn));
1da177e4 LT	351	break;
	352
	353	case store:
f0e98c38 DM	354	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	355	(unsigned long *) addr, regs);
1da177e4 LT	356	break;
	357
	358	case both:
1da177e4 LT	359	/*
	360	* This was supported in 2.4. However, we question
	361	* the value of SWAP instruction across word boundaries.
	362	*/
	363	printk("Unaligned SWAP unsupported.\n");
f0e98c38	364	err = -EFAULT;
1da177e4 LT	365	break;
	366
	367	default:
	368	unaligned_panic("Impossible user unaligned trap.");
1da177e4 LT	369	goto out;
1da177e4 LT	370	}
f0e98c38 DM	371	if (err)
	372	goto kill_user;
	373	else
	374	advance(regs);
1da177e4 LT	375	goto out;
	376	}
	377
	378	kill_user:
	379	user_mna_trap_fault(regs, insn);
	380	out:
b19f8200	381	;
1da177e4	382	}