1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* align.c - handle alignment exceptions for the Power PC.
5  * Copyright (c) 1998-1999 TiVo, Inc.
9  * Copyright (c) 2001-2002 PPC64 team, IBM Corp
10  *   64-bit and Power4 support
39 #define ST	1	/* store */
40 #define SE	2	/* sign-extend value, or FP ld/st as word */
48 	{ 8, LD+E8 },		/* 0 00 00: evldd[x] */
49 	{ 8, LD+E4 },		/* 0 00 01: evldw[x] */
50 	{ 8, LD },		/* 0 00 10: evldh[x] */
65 	{ 8, ST+E8 },		/* 1 00 00: evstdd[x] */
66 	{ 8, ST+E4 },		/* 1 00 01: evstdw[x] */
67 	{ 8, ST },		/* 1 00 10: evstdh[x] */
68 	INVALID,		/* 1 00 11 */
69 	INVALID,		/* 1 01 00 */
70 	INVALID,		/* 1 01 01 */
71 	INVALID,		/* 1 01 10 */
72 	INVALID,		/* 1 01 11 */
73 	{ 4, ST },		/* 1 10 00: evstwhe[x] */
74 	INVALID,		/* 1 10 01 */
75 	{ 4, ST },		/* 1 10 10: evstwho[x] */
76 	INVALID,		/* 1 10 11 */
77 	{ 4, ST+E4 },		/* 1 11 00: evstwwe[x] */
78 	INVALID,		/* 1 11 01 */
79 	{ 4, ST+E4 },		/* 1 11 10: evstwwo[x] */
80 	INVALID,		/* 1 11 11 */
104  * Only Book-E has these instructions, and it does true little-endian,
114 		u8 v[8];  in emulate_spe()  member
117 	unsigned long *evr = &current->thread.evr[reg];  in emulate_spe()
121 	instr = (instr >> 1) & 0x1f;  in emulate_spe()
124 	addr = (unsigned char __user *)regs->dar;  in emulate_spe()
129 	/* userland only */  in emulate_spe()
145 			data.w[1] = regs->gpr[reg];  in emulate_spe()
149 			data.h[3] = regs->gpr[reg] >> 16;  in emulate_spe()
153 			data.h[3] = regs->gpr[reg] & 0xffff;  in emulate_spe()
156 			data.w[1] = *evr;  in emulate_spe()
159 			data.w[1] = regs->gpr[reg];  in emulate_spe()
162 			return -EINVAL;  in emulate_spe()
169 			return -EFAULT;  in emulate_spe()
172 		case 8:  in emulate_spe()
173 			unsafe_get_user(temp.v[0], p++, Efault_read);  in emulate_spe()
174 			unsafe_get_user(temp.v[1], p++, Efault_read);  in emulate_spe()
175 			unsafe_get_user(temp.v[2], p++, Efault_read);  in emulate_spe()
176 			unsafe_get_user(temp.v[3], p++, Efault_read);  in emulate_spe()
179 			unsafe_get_user(temp.v[4], p++, Efault_read);  in emulate_spe()
180 			unsafe_get_user(temp.v[5], p++, Efault_read);  in emulate_spe()
183 			unsafe_get_user(temp.v[6], p++, Efault_read);  in emulate_spe()
184 			unsafe_get_user(temp.v[7], p++, Efault_read);  in emulate_spe()
200 			data.h[1] = temp.h[3];  in emulate_spe()
209 			data.h[1] = temp.h[2];  in emulate_spe()
213 			data.w[0] = temp.w[1];  in emulate_spe()
214 			data.w[1] = temp.w[1];  in emulate_spe()
218 			data.h[1] = temp.h[2];  in emulate_spe()
223 			return -EINVAL;  in emulate_spe()
234 			data.w[1] = swab32(data.w[1]);  in emulate_spe()
239 			data.h[1] = swab16(data.h[1]);  in emulate_spe()
247 		data.w[0] = (s16)data.h[1];  in emulate_spe()
248 		data.w[1] = (s16)data.h[3];  in emulate_spe()
256 			return -EFAULT;  in emulate_spe()
259 		case 8:  in emulate_spe()
260 			unsafe_put_user(data.v[0], p++, Efault_write);  in emulate_spe()
261 			unsafe_put_user(data.v[1], p++, Efault_write);  in emulate_spe()
262 			unsafe_put_user(data.v[2], p++, Efault_write);  in emulate_spe()
263 			unsafe_put_user(data.v[3], p++, Efault_write);  in emulate_spe()
266 			unsafe_put_user(data.v[4], p++, Efault_write);  in emulate_spe()
267 			unsafe_put_user(data.v[5], p++, Efault_write);  in emulate_spe()
270 			unsafe_put_user(data.v[6], p++, Efault_write);  in emulate_spe()
271 			unsafe_put_user(data.v[7], p++, Efault_write);  in emulate_spe()
276 		regs->gpr[reg] = data.w[1];  in emulate_spe()
279 	return 1;  in emulate_spe()
283 	return -EFAULT;  in emulate_spe()
287 	return -EFAULT;  in emulate_spe()
294  * Return 1 on success
296  * Return -EFAULT if data address is bad
307 	if (is_kernel_addr(regs->nip))  in fix_alignment()
308 		r = copy_inst_from_kernel_nofault(&instr, (void *)regs->nip);  in fix_alignment()
310 		r = __get_user_instr(instr, (void __user *)regs->nip);  in fix_alignment()
313 		return -EFAULT;  in fix_alignment()
314 	if ((regs->msr & MSR_LE) != (MSR_KERNEL & MSR_LE)) {  in fix_alignment()
315 		/* We don't handle PPC little-endian any more... */  in fix_alignment()
317 			return -EIO;  in fix_alignment()
337 	 * when pasting to a co-processor. Furthermore, paste_last is the  in fix_alignment()
341 		return -EIO;  in fix_alignment()
345 		return -EINVAL;  in fix_alignment()
350 			return -EINVAL;  in fix_alignment()
356 			return -EIO;  in fix_alignment()
362 		return 1;  in fix_alignment()