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
40 #define SE	2	/* sign-extend value, or FP ld/st as word */
56 	{ 4, LD },		/* 0 10 00: evlwhe[x] */
58 	{ 4, LD },		/* 0 10 10: evlwhou[x] */
59 	{ 4, LD+SE },		/* 0 10 11: evlwhos[x] */
60 	{ 4, LD+E4 },		/* 0 11 00: evlwwsplat[x] */
62 	{ 4, LD },		/* 0 11 10: evlwhsplat[x] */
73 	{ 4, ST },		/* 1 10 00: evstwhe[x] */
75 	{ 4, ST },		/* 1 10 10: evstwho[x] */
77 	{ 4, ST+E4 },		/* 1 11 00: evstwwe[x] */
79 	{ 4, ST+E4 },		/* 1 11 10: evstwwo[x] */
104  * Only Book-E has these instructions, and it does true little-endian,
114 		u16 h[4];  in emulate_spe()
116 	} data, temp;  in emulate_spe()  local
118 	unsigned long *evr = &current->thread.evr[reg];  in emulate_spe()
125 	addr = (unsigned char __user *)regs->dar;  in emulate_spe()
133 		return -EFAULT;  in emulate_spe()
151 			data.w[1] = regs->gpr[reg];  in emulate_spe()
155 			data.h[3] = regs->gpr[reg] >> 16;  in emulate_spe()
159 			data.h[3] = regs->gpr[reg] & 0xffff;  in emulate_spe()
165 			data.w[1] = regs->gpr[reg];  in emulate_spe()
168 			return -EINVAL;  in emulate_spe()
171 		temp.ll = data.ll = 0;  in emulate_spe()
177 			ret |= __get_user_inatomic(temp.v[0], p++);  in emulate_spe()
178 			ret |= __get_user_inatomic(temp.v[1], p++);  in emulate_spe()
179 			ret |= __get_user_inatomic(temp.v[2], p++);  in emulate_spe()
180 			ret |= __get_user_inatomic(temp.v[3], p++);  in emulate_spe()
182 		case 4:  in emulate_spe()
183 			ret |= __get_user_inatomic(temp.v[4], p++);  in emulate_spe()
184 			ret |= __get_user_inatomic(temp.v[5], p++);  in emulate_spe()
187 			ret |= __get_user_inatomic(temp.v[6], p++);  in emulate_spe()
188 			ret |= __get_user_inatomic(temp.v[7], p++);  in emulate_spe()
190 				return -EFAULT;  in emulate_spe()
197 			data.ll = temp.ll;  in emulate_spe()
200 			data.h[0] = temp.h[3];  in emulate_spe()
201 			data.h[2] = temp.h[3];  in emulate_spe()
205 			data.h[1] = temp.h[3];  in emulate_spe()
206 			data.h[3] = temp.h[3];  in emulate_spe()
209 			data.h[0] = temp.h[2];  in emulate_spe()
210 			data.h[2] = temp.h[3];  in emulate_spe()
214 			data.h[1] = temp.h[2];  in emulate_spe()
215 			data.h[3] = temp.h[3];  in emulate_spe()
218 			data.w[0] = temp.w[1];  in emulate_spe()
219 			data.w[1] = temp.w[1];  in emulate_spe()
222 			data.h[0] = temp.h[2];  in emulate_spe()
223 			data.h[1] = temp.h[2];  in emulate_spe()
224 			data.h[2] = temp.h[3];  in emulate_spe()
225 			data.h[3] = temp.h[3];  in emulate_spe()
228 			return -EINVAL;  in emulate_spe()
267 		case 4:  in emulate_spe()
268 			ret |= __put_user_inatomic(data.v[4], p++);  in emulate_spe()
276 			return -EFAULT;  in emulate_spe()
279 		regs->gpr[reg] = data.w[1];  in emulate_spe()
291  * Return -EFAULT if data address is bad
308 	if (unlikely(__get_user_instr(instr, (void __user *)regs->nip)))  in fix_alignment()
309 		return -EFAULT;  in fix_alignment()
310 	if ((regs->msr & MSR_LE) != (MSR_KERNEL & MSR_LE)) {  in fix_alignment()
311 		/* We don't handle PPC little-endian any more... */  in fix_alignment()
313 			return -EIO;  in fix_alignment()
333 	 * when pasting to a co-processor. Furthermore, paste_last is the  in fix_alignment()
337 		return -EIO;  in fix_alignment()
341 		return -EINVAL;  in fix_alignment()
346 			return -EINVAL;  in fix_alignment()
351 			return -EIO;  in fix_alignment()