[mirror_ubuntu-artful-kernel.git] / arch / sparc / kernel / unaligned.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>

/* #define DEBUG_MNA */

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

#ifdef DEBUG_MNA
static char *dirstrings[] = {
  "load", "store", "both", "fpload", "fpstore", "invalid"
};
#endif

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_window *win;

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

	/* Ho hum, the slightly complicated case. */
	win = (struct reg_window *) 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_window __user *win;
	unsigned long ret;

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

	/* Ho hum, the slightly complicated case. */
	win = (struct reg_window __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_window *win;

	if(reg < 16)
		return &regs->u_regs[reg];
	win = (struct reg_window *) 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;

#ifdef DEBUG_MNA
		printk("KMNA: pc=%08lx [dir=%s addr=%08lx size=%d] retpc[%08lx]\n",
		       regs->pc, dirstrings[dir], addr, size, regs->u_regs[UREG_RETPC]);
#endif
		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;

	lock_kernel();
	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);
		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:
	unlock_kernel();
}
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>
	20
	21	/* #define DEBUG_MNA */
	22
	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
	32	#ifdef DEBUG_MNA
	33	static char *dirstrings[] = {
	34	"load", "store", "both", "fpload", "fpstore", "invalid"
	35	};
	36	#endif
	37
	38	static inline enum direction decode_direction(unsigned int insn)
	39	{
	40	unsigned long tmp = (insn >> 21) & 1;
	41
	42	if(!tmp)
	43	return load;
	44	else {
	45	if(((insn>>19)&0x3f) == 15)
	46	return both;
	47	else
	48	return store;
	49	}
	50	}
	51
	52	/* 8 = double-word, 4 = word, 2 = half-word */
	53	static inline int decode_access_size(unsigned int insn)
	54	{
	55	insn = (insn >> 19) & 3;
	56
	57	if(!insn)
	58	return 4;
	59	else if(insn == 3)
	60	return 8;
	61	else if(insn == 2)
	62	return 2;
	63	else {
	64	printk("Impossible unaligned trap. insn=%08x\n", insn);
	65	die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs);
66	return 4; /* just to keep gcc happy. */
67	}
68	}
69
70	/* 0x400000 = signed, 0 = unsigned */
71	static inline int decode_signedness(unsigned int insn)
72	{
73	return (insn & 0x400000);
74	}
75
76	static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2,
77	unsigned int rd)
78	{
79	if(rs2 >= 16 \|\| rs1 >= 16 \|\| rd >= 16) {
80	/* Wheee... */
81	__asm__ __volatile__("save %sp, -0x40, %sp\n\t"
82	"save %sp, -0x40, %sp\n\t"
83	"save %sp, -0x40, %sp\n\t"
84	"save %sp, -0x40, %sp\n\t"
85	"save %sp, -0x40, %sp\n\t"
86	"save %sp, -0x40, %sp\n\t"
87	"save %sp, -0x40, %sp\n\t"
88	"restore; restore; restore; restore;\n\t"
89	"restore; restore; restore;\n\t");
90	}
91	}
92
93	static inline int sign_extend_imm13(int imm)
94	{
95	return imm << 19 >> 19;
96	}
97
98	static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs)
99	{
100	struct reg_window *win;
101
102	if(reg < 16)
103	return (!reg ? 0 : regs->u_regs[reg]);
104
105	/* Ho hum, the slightly complicated case. */
106	win = (struct reg_window *) regs->u_regs[UREG_FP];
107	return win->locals[reg - 16]; /* yes, I know what this does... */
108	}
109
110	static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs)
111	{
112	struct reg_window __user *win;
113	unsigned long ret;
114
115	if (reg < 16)
116	return (!reg ? 0 : regs->u_regs[reg]);
117
118	/* Ho hum, the slightly complicated case. */
119	win = (struct reg_window __user *) regs->u_regs[UREG_FP];
120
121	if ((unsigned long)win & 3)
122	return -1;
123
124	if (get_user(ret, &win->locals[reg - 16]))
125	return -1;
126
127	return ret;
128	}
129
130	static inline unsigned long fetch_reg_addr(unsigned int reg, struct pt_regs regs)
131	{
132	struct reg_window *win;
133
134	if(reg < 16)
135	return &regs->u_regs[reg];
136	win = (struct reg_window *) regs->u_regs[UREG_FP];
137	return &win->locals[reg - 16];
138	}
139
140	static unsigned long compute_effective_address(struct pt_regs *regs,
141	unsigned int insn)
142	{
143	unsigned int rs1 = (insn >> 14) & 0x1f;
144	unsigned int rs2 = insn & 0x1f;
145	unsigned int rd = (insn >> 25) & 0x1f;
146
147	if(insn & 0x2000) {
148	maybe_flush_windows(rs1, 0, rd);
149	return (fetch_reg(rs1, regs) + sign_extend_imm13(insn));
150	} else {
151	maybe_flush_windows(rs1, rs2, rd);
152	return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs));
153	}
154	}
155
156	unsigned long safe_compute_effective_address(struct pt_regs *regs,
157	unsigned int insn)
158	{
159	unsigned int rs1 = (insn >> 14) & 0x1f;
160	unsigned int rs2 = insn & 0x1f;
161	unsigned int rd = (insn >> 25) & 0x1f;
162
163	if(insn & 0x2000) {
164	maybe_flush_windows(rs1, 0, rd);
165	return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn));
166	} else {
167	maybe_flush_windows(rs1, rs2, rd);
168	return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs));
169	}
170	}
171
172	/* This is just to make gcc think panic does return... */
173	static void unaligned_panic(char *str)
174	{
175	panic(str);
176	}
177
f0e98c38 DM	178	/* una_asm.S */
	179	extern int do_int_load(unsigned long *dest_reg, int size,
	180	unsigned long *saddr, int is_signed);
	181	extern int __do_int_store(unsigned long *dst_addr, int size,
	182	unsigned long *src_val);
	183
	184	static int do_int_store(int reg_num, int size, unsigned long *dst_addr,
	185	struct pt_regs *regs)
	186	{
	187	unsigned long zero[2] = { 0, 0 };
	188	unsigned long *src_val;
	189
	190	if (reg_num)
	191	src_val = fetch_reg_addr(reg_num, regs);
	192	else {
	193	src_val = &zero[0];
	194	if (size == 8)
	195	zero[1] = fetch_reg(1, regs);
	196	}
	197	return __do_int_store(dst_addr, size, src_val);
	198	}
1da177e4 LT	199
	200	extern void smp_capture(void);
	201	extern void smp_release(void);
	202
1da177e4 LT	203	static inline void advance(struct pt_regs *regs)
	204	{
	205	regs->pc = regs->npc;
	206	regs->npc += 4;
	207	}
	208
	209	static inline int floating_point_load_or_store_p(unsigned int insn)
	210	{
	211	return (insn >> 24) & 1;
	212	}
	213
	214	static inline int ok_for_kernel(unsigned int insn)
	215	{
	216	return !floating_point_load_or_store_p(insn);
	217	}
	218
f0e98c38	219	static void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	220	{
	221	unsigned long g2 = regs->u_regs [UREG_G2];
	222	unsigned long fixup = search_extables_range(regs->pc, &g2);
	223
	224	if (!fixup) {
	225	unsigned long address = compute_effective_address(regs, insn);
	226	if(address < PAGE_SIZE) {
	227	printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler");
	228	} else
	229	printk(KERN_ALERT "Unable to handle kernel paging request in mna handler");
	230	printk(KERN_ALERT " at virtual address %08lx\n",address);
	231	printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n",
	232	(current->mm ? current->mm->context :
	233	current->active_mm->context));
	234	printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n",
	235	(current->mm ? (unsigned long) current->mm->pgd :
	236	(unsigned long) current->active_mm->pgd));
	237	die_if_kernel("Oops", regs);
	238	/* Not reached */
	239	}
	240	regs->pc = fixup;
	241	regs->npc = regs->pc + 4;
	242	regs->u_regs [UREG_G2] = g2;
	243	}
	244
	245	asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	246	{
	247	enum direction dir = decode_direction(insn);
	248	int size = decode_access_size(insn);
	249
	250	if(!ok_for_kernel(insn) \|\| dir == both) {
	251	printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n",
	252	regs->pc);
	253	unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store.");
1da177e4 LT	254	} else {
1da177e4 LT	255	unsigned long addr = compute_effective_address(regs, insn);
f0e98c38	256	int err;
1da177e4 LT	257
	258	#ifdef DEBUG_MNA
	259	printk("KMNA: pc=%08lx [dir=%s addr=%08lx size=%d] retpc[%08lx]\n",
	260	regs->pc, dirstrings[dir], addr, size, regs->u_regs[UREG_RETPC]);
	261	#endif
f0e98c38	262	switch (dir) {
1da177e4	263	case load:
f0e98c38 DM	264	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	265	regs),
	266	size, (unsigned long *) addr,
	267	decode_signedness(insn));
1da177e4 LT	268	break;
	269
	270	case store:
f0e98c38 DM	271	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	272	(unsigned long *) addr, regs);
1da177e4	273	break;
1da177e4 LT	274	default:
	275	panic("Impossible kernel unaligned trap.");
	276	/* Not reached... */
	277	}
f0e98c38 DM	278	if (err)
	279	kernel_mna_trap_fault(regs, insn);
	280	else
	281	advance(regs);
1da177e4 LT	282	}
	283	}
	284
	285	static inline int ok_for_user(struct pt_regs *regs, unsigned int insn,
	286	enum direction dir)
	287	{
	288	unsigned int reg;
	289	int check = (dir == load) ? VERIFY_READ : VERIFY_WRITE;
	290	int size = ((insn >> 19) & 3) == 3 ? 8 : 4;
	291
	292	if ((regs->pc \| regs->npc) & 3)
	293	return 0;
	294
	295	/* Must access_ok() in all the necessary places. */
	296	#define WINREG_ADDR(regnum) \
	297	((void __user )(((unsigned long )regs->u_regs[UREG_FP])+(regnum)))
	298
	299	reg = (insn >> 25) & 0x1f;
	300	if (reg >= 16) {
	301	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	302	return -EFAULT;
	303	}
	304	reg = (insn >> 14) & 0x1f;
	305	if (reg >= 16) {
	306	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	307	return -EFAULT;
	308	}
	309	if (!(insn & 0x2000)) {
	310	reg = (insn & 0x1f);
	311	if (reg >= 16) {
	312	if (!access_ok(check, WINREG_ADDR(reg - 16), size))
	313	return -EFAULT;
	314	}
	315	}
	316	#undef WINREG_ADDR
	317	return 0;
	318	}
	319
f0e98c38	320	static void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn)
1da177e4 LT	321	{
	322	siginfo_t info;
	323
	324	info.si_signo = SIGBUS;
	325	info.si_errno = 0;
	326	info.si_code = BUS_ADRALN;
	327	info.si_addr = (void __user *)safe_compute_effective_address(regs, insn);
	328	info.si_trapno = 0;
	329	send_sig_info(SIGBUS, &info, current);
	330	}
	331
	332	asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn)
	333	{
	334	enum direction dir;
	335
	336	lock_kernel();
	337	if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) \|\|
	338	(((insn >> 30) & 3) != 3))
	339	goto kill_user;
	340	dir = decode_direction(insn);
	341	if(!ok_for_user(regs, insn, dir)) {
	342	goto kill_user;
	343	} else {
f0e98c38	344	int err, size = decode_access_size(insn);
1da177e4 LT	345	unsigned long addr;
	346
	347	if(floating_point_load_or_store_p(insn)) {
	348	printk("User FPU load/store unaligned unsupported.\n");
	349	goto kill_user;
	350	}
	351
	352	addr = compute_effective_address(regs, insn);
	353	switch(dir) {
	354	case load:
f0e98c38 DM	355	err = do_int_load(fetch_reg_addr(((insn>>25)&0x1f),
	356	regs),
	357	size, (unsigned long *) addr,
	358	decode_signedness(insn));
1da177e4 LT	359	break;
	360
	361	case store:
f0e98c38 DM	362	err = do_int_store(((insn>>25)&0x1f), size,
f0e98c38 DM	363	(unsigned long *) addr, regs);
1da177e4 LT	364	break;
	365
	366	case both:
1da177e4 LT	367	/*
	368	* This was supported in 2.4. However, we question
	369	* the value of SWAP instruction across word boundaries.
	370	*/
	371	printk("Unaligned SWAP unsupported.\n");
f0e98c38	372	err = -EFAULT;
1da177e4 LT	373	break;
	374
	375	default:
	376	unaligned_panic("Impossible user unaligned trap.");
1da177e4 LT	377	goto out;
1da177e4 LT	378	}
f0e98c38 DM	379	if (err)
	380	goto kill_user;
	381	else
	382	advance(regs);
1da177e4 LT	383	goto out;
	384	}
	385
	386	kill_user:
	387	user_mna_trap_fault(regs, insn);
	388	out:
	389	unlock_kernel();
	390	}