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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2005-11-17 22:09:41 -0500
committerPaul Mackerras <paulus@samba.org>2005-11-17 22:39:23 -0500
commit5daf9071b527089b1bd5d9cb3a5354b83121550e (patch)
tree3abf10c1f67975f3a7d0def22de261f395c325f1 /arch
parent6defa38b3754c84cd3449447477aed81ea979407 (diff)
[PATCH] powerpc: merge align.c
This patch merges align.c, the result isn't quite what was in ppc64 nor what was in ppc32 :) It should implement all the functionalities of both though. Kumar, since you played with that in the past, I suppose you have some test cases for verifying that it works properly before I dig out the 601 machine ? :) Since it's likely that I won't be able to test all scenario, code inspection is much welcome. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/Makefile2
-rw-r--r--arch/powerpc/kernel/align.c (renamed from arch/ppc64/kernel/align.c)394
-rw-r--r--arch/ppc/kernel/Makefile4
-rw-r--r--arch/ppc/kernel/align.c410
-rw-r--r--arch/ppc64/kernel/Makefile2
5 files changed, 268 insertions, 544 deletions
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 4970e3721a84..0e679afb2e20 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -12,7 +12,7 @@ CFLAGS_btext.o += -fPIC
12endif 12endif
13 13
14obj-y := semaphore.o cputable.o ptrace.o syscalls.o \ 14obj-y := semaphore.o cputable.o ptrace.o syscalls.o \
15 irq.o signal_32.o pmc.o vdso.o 15 irq.o align.o signal_32.o pmc.o vdso.o
16obj-y += vdso32/ 16obj-y += vdso32/
17obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \ 17obj-$(CONFIG_PPC64) += setup_64.o binfmt_elf32.o sys_ppc32.o \
18 signal_64.o ptrace32.o systbl.o \ 18 signal_64.o ptrace32.o systbl.o \
diff --git a/arch/ppc64/kernel/align.c b/arch/powerpc/kernel/align.c
index 256d5b592aa1..faaec9c6f78f 100644
--- a/arch/ppc64/kernel/align.c
+++ b/arch/powerpc/kernel/align.c
@@ -7,6 +7,9 @@
7 * PowerPC 403GCX/405GP modifications. 7 * PowerPC 403GCX/405GP modifications.
8 * Copyright (c) 2001-2002 PPC64 team, IBM Corp 8 * Copyright (c) 2001-2002 PPC64 team, IBM Corp
9 * 64-bit and Power4 support 9 * 64-bit and Power4 support
10 * Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp
11 * <benh@kernel.crashing.org>
12 * Merge ppc32 and ppc64 implementations
10 * 13 *
11 * This program is free software; you can redistribute it and/or 14 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License 15 * modify it under the terms of the GNU General Public License
@@ -38,10 +41,15 @@ struct aligninfo {
38#define F 8 /* to/from fp regs */ 41#define F 8 /* to/from fp regs */
39#define U 0x10 /* update index register */ 42#define U 0x10 /* update index register */
40#define M 0x20 /* multiple load/store */ 43#define M 0x20 /* multiple load/store */
41#define SW 0x40 /* byte swap */ 44#define SW 0x40 /* byte swap int or ... */
45#define S 0x40 /* ... single-precision fp */
46#define SX 0x40 /* byte count in XER */
47#define HARD 0x80 /* string, stwcx. */
42 48
43#define DCBZ 0x5f /* 8xx/82xx dcbz faults when cache not enabled */ 49#define DCBZ 0x5f /* 8xx/82xx dcbz faults when cache not enabled */
44 50
51#define SWAP(a, b) (t = (a), (a) = (b), (b) = t)
52
45/* 53/*
46 * The PowerPC stores certain bits of the instruction that caused the 54 * The PowerPC stores certain bits of the instruction that caused the
47 * alignment exception in the DSISR register. This array maps those 55 * alignment exception in the DSISR register. This array maps those
@@ -57,14 +65,14 @@ static struct aligninfo aligninfo[128] = {
57 { 2, LD+SE }, /* 00 0 0101: lha */ 65 { 2, LD+SE }, /* 00 0 0101: lha */
58 { 2, ST }, /* 00 0 0110: sth */ 66 { 2, ST }, /* 00 0 0110: sth */
59 { 4, LD+M }, /* 00 0 0111: lmw */ 67 { 4, LD+M }, /* 00 0 0111: lmw */
60 { 4, LD+F }, /* 00 0 1000: lfs */ 68 { 4, LD+F+S }, /* 00 0 1000: lfs */
61 { 8, LD+F }, /* 00 0 1001: lfd */ 69 { 8, LD+F }, /* 00 0 1001: lfd */
62 { 4, ST+F }, /* 00 0 1010: stfs */ 70 { 4, ST+F+S }, /* 00 0 1010: stfs */
63 { 8, ST+F }, /* 00 0 1011: stfd */ 71 { 8, ST+F }, /* 00 0 1011: stfd */
64 INVALID, /* 00 0 1100 */ 72 INVALID, /* 00 0 1100 */
65 { 8, LD }, /* 00 0 1101: ld */ 73 { 8, LD }, /* 00 0 1101: ld/ldu/lwa */
66 INVALID, /* 00 0 1110 */ 74 INVALID, /* 00 0 1110 */
67 { 8, ST }, /* 00 0 1111: std */ 75 { 8, ST }, /* 00 0 1111: std/stdu */
68 { 4, LD+U }, /* 00 1 0000: lwzu */ 76 { 4, LD+U }, /* 00 1 0000: lwzu */
69 INVALID, /* 00 1 0001 */ 77 INVALID, /* 00 1 0001 */
70 { 4, ST+U }, /* 00 1 0010: stwu */ 78 { 4, ST+U }, /* 00 1 0010: stwu */
@@ -73,9 +81,9 @@ static struct aligninfo aligninfo[128] = {
73 { 2, LD+SE+U }, /* 00 1 0101: lhau */ 81 { 2, LD+SE+U }, /* 00 1 0101: lhau */
74 { 2, ST+U }, /* 00 1 0110: sthu */ 82 { 2, ST+U }, /* 00 1 0110: sthu */
75 { 4, ST+M }, /* 00 1 0111: stmw */ 83 { 4, ST+M }, /* 00 1 0111: stmw */
76 { 4, LD+F+U }, /* 00 1 1000: lfsu */ 84 { 4, LD+F+S+U }, /* 00 1 1000: lfsu */
77 { 8, LD+F+U }, /* 00 1 1001: lfdu */ 85 { 8, LD+F+U }, /* 00 1 1001: lfdu */
78 { 4, ST+F+U }, /* 00 1 1010: stfsu */ 86 { 4, ST+F+S+U }, /* 00 1 1010: stfsu */
79 { 8, ST+F+U }, /* 00 1 1011: stfdu */ 87 { 8, ST+F+U }, /* 00 1 1011: stfdu */
80 INVALID, /* 00 1 1100 */ 88 INVALID, /* 00 1 1100 */
81 INVALID, /* 00 1 1101 */ 89 INVALID, /* 00 1 1101 */
@@ -89,10 +97,10 @@ static struct aligninfo aligninfo[128] = {
89 { 4, LD+SE }, /* 01 0 0101: lwax */ 97 { 4, LD+SE }, /* 01 0 0101: lwax */
90 INVALID, /* 01 0 0110 */ 98 INVALID, /* 01 0 0110 */
91 INVALID, /* 01 0 0111 */ 99 INVALID, /* 01 0 0111 */
92 { 0, LD }, /* 01 0 1000: lswx */ 100 { 4, LD+M+HARD+SX }, /* 01 0 1000: lswx */
93 { 0, LD }, /* 01 0 1001: lswi */ 101 { 4, LD+M+HARD }, /* 01 0 1001: lswi */
94 { 0, ST }, /* 01 0 1010: stswx */ 102 { 4, ST+M+HARD+SX }, /* 01 0 1010: stswx */
95 { 0, ST }, /* 01 0 1011: stswi */ 103 { 4, ST+M+HARD }, /* 01 0 1011: stswi */
96 INVALID, /* 01 0 1100 */ 104 INVALID, /* 01 0 1100 */
97 { 8, LD+U }, /* 01 0 1101: ldu */ 105 { 8, LD+U }, /* 01 0 1101: ldu */
98 INVALID, /* 01 0 1110 */ 106 INVALID, /* 01 0 1110 */
@@ -115,7 +123,7 @@ static struct aligninfo aligninfo[128] = {
115 INVALID, /* 01 1 1111 */ 123 INVALID, /* 01 1 1111 */
116 INVALID, /* 10 0 0000 */ 124 INVALID, /* 10 0 0000 */
117 INVALID, /* 10 0 0001 */ 125 INVALID, /* 10 0 0001 */
118 { 0, ST }, /* 10 0 0010: stwcx. */ 126 INVALID, /* 10 0 0010: stwcx. */
119 INVALID, /* 10 0 0011 */ 127 INVALID, /* 10 0 0011 */
120 INVALID, /* 10 0 0100 */ 128 INVALID, /* 10 0 0100 */
121 INVALID, /* 10 0 0101 */ 129 INVALID, /* 10 0 0101 */
@@ -144,7 +152,7 @@ static struct aligninfo aligninfo[128] = {
144 INVALID, /* 10 1 1100 */ 152 INVALID, /* 10 1 1100 */
145 INVALID, /* 10 1 1101 */ 153 INVALID, /* 10 1 1101 */
146 INVALID, /* 10 1 1110 */ 154 INVALID, /* 10 1 1110 */
147 { L1_CACHE_BYTES, ST }, /* 10 1 1111: dcbz */ 155 { 0, ST+HARD }, /* 10 1 1111: dcbz */
148 { 4, LD }, /* 11 0 0000: lwzx */ 156 { 4, LD }, /* 11 0 0000: lwzx */
149 INVALID, /* 11 0 0001 */ 157 INVALID, /* 11 0 0001 */
150 { 4, ST }, /* 11 0 0010: stwx */ 158 { 4, ST }, /* 11 0 0010: stwx */
@@ -153,9 +161,9 @@ static struct aligninfo aligninfo[128] = {
153 { 2, LD+SE }, /* 11 0 0101: lhax */ 161 { 2, LD+SE }, /* 11 0 0101: lhax */
154 { 2, ST }, /* 11 0 0110: sthx */ 162 { 2, ST }, /* 11 0 0110: sthx */
155 INVALID, /* 11 0 0111 */ 163 INVALID, /* 11 0 0111 */
156 { 4, LD+F }, /* 11 0 1000: lfsx */ 164 { 4, LD+F+S }, /* 11 0 1000: lfsx */
157 { 8, LD+F }, /* 11 0 1001: lfdx */ 165 { 8, LD+F }, /* 11 0 1001: lfdx */
158 { 4, ST+F }, /* 11 0 1010: stfsx */ 166 { 4, ST+F+S }, /* 11 0 1010: stfsx */
159 { 8, ST+F }, /* 11 0 1011: stfdx */ 167 { 8, ST+F }, /* 11 0 1011: stfdx */
160 INVALID, /* 11 0 1100 */ 168 INVALID, /* 11 0 1100 */
161 { 8, LD+M }, /* 11 0 1101: lmd */ 169 { 8, LD+M }, /* 11 0 1101: lmd */
@@ -169,9 +177,9 @@ static struct aligninfo aligninfo[128] = {
169 { 2, LD+SE+U }, /* 11 1 0101: lhaux */ 177 { 2, LD+SE+U }, /* 11 1 0101: lhaux */
170 { 2, ST+U }, /* 11 1 0110: sthux */ 178 { 2, ST+U }, /* 11 1 0110: sthux */
171 INVALID, /* 11 1 0111 */ 179 INVALID, /* 11 1 0111 */
172 { 4, LD+F+U }, /* 11 1 1000: lfsux */ 180 { 4, LD+F+S+U }, /* 11 1 1000: lfsux */
173 { 8, LD+F+U }, /* 11 1 1001: lfdux */ 181 { 8, LD+F+U }, /* 11 1 1001: lfdux */
174 { 4, ST+F+U }, /* 11 1 1010: stfsux */ 182 { 4, ST+F+S+U }, /* 11 1 1010: stfsux */
175 { 8, ST+F+U }, /* 11 1 1011: stfdux */ 183 { 8, ST+F+U }, /* 11 1 1011: stfdux */
176 INVALID, /* 11 1 1100 */ 184 INVALID, /* 11 1 1100 */
177 INVALID, /* 11 1 1101 */ 185 INVALID, /* 11 1 1101 */
@@ -179,45 +187,175 @@ static struct aligninfo aligninfo[128] = {
179 INVALID, /* 11 1 1111 */ 187 INVALID, /* 11 1 1111 */
180}; 188};
181 189
182#define SWAP(a, b) (t = (a), (a) = (b), (b) = t) 190/*
183 191 * Create a DSISR value from the instruction
192 */
184static inline unsigned make_dsisr(unsigned instr) 193static inline unsigned make_dsisr(unsigned instr)
185{ 194{
186 unsigned dsisr; 195 unsigned dsisr;
187 196
188 /* create a DSISR value from the instruction */ 197
189 dsisr = (instr & 0x03ff0000) >> 16; /* bits 6:15 --> 22:31 */ 198 /* bits 6:15 --> 22:31 */
190 199 dsisr = (instr & 0x03ff0000) >> 16;
191 if ( IS_XFORM(instr) ) { 200
192 dsisr |= (instr & 0x00000006) << 14; /* bits 29:30 --> 15:16 */ 201 if (IS_XFORM(instr)) {
193 dsisr |= (instr & 0x00000040) << 8; /* bit 25 --> 17 */ 202 /* bits 29:30 --> 15:16 */
194 dsisr |= (instr & 0x00000780) << 3; /* bits 21:24 --> 18:21 */ 203 dsisr |= (instr & 0x00000006) << 14;
204 /* bit 25 --> 17 */
205 dsisr |= (instr & 0x00000040) << 8;
206 /* bits 21:24 --> 18:21 */
207 dsisr |= (instr & 0x00000780) << 3;
208 } else {
209 /* bit 5 --> 17 */
210 dsisr |= (instr & 0x04000000) >> 12;
211 /* bits 1: 4 --> 18:21 */
212 dsisr |= (instr & 0x78000000) >> 17;
213 /* bits 30:31 --> 12:13 */
214 if (IS_DSFORM(instr))
215 dsisr |= (instr & 0x00000003) << 18;
195 } 216 }
196 else { 217
197 dsisr |= (instr & 0x04000000) >> 12; /* bit 5 --> 17 */ 218 return dsisr;
198 dsisr |= (instr & 0x78000000) >> 17; /* bits 1: 4 --> 18:21 */ 219}
199 if ( IS_DSFORM(instr) ) { 220
200 dsisr |= (instr & 0x00000003) << 18; /* bits 30:31 --> 12:13 */ 221/*
222 * The dcbz (data cache block zero) instruction
223 * gives an alignment fault if used on non-cacheable
224 * memory. We handle the fault mainly for the
225 * case when we are running with the cache disabled
226 * for debugging.
227 */
228static int emulate_dcbz(struct pt_regs *regs, unsigned char __user *addr)
229{
230 long __user *p;
231 int i, size;
232
233#ifdef __powerpc64__
234 size = ppc64_caches.dline_size;
235#else
236 size = L1_CACHE_BYTES;
237#endif
238 p = (long __user *) (regs->dar & -size);
239 if (user_mode(regs) && !access_ok(VERIFY_WRITE, p, size))
240 return -EFAULT;
241 for (i = 0; i < size / sizeof(long); ++i)
242 if (__put_user(0, p+i))
243 return -EFAULT;
244 return 1;
245}
246
247/*
248 * Emulate load & store multiple instructions
249 * On 64-bit machines, these instructions only affect/use the
250 * bottom 4 bytes of each register, and the loads clear the
251 * top 4 bytes of the affected register.
252 */
253#ifdef CONFIG_PPC64
254#define REG_BYTE(rp, i) *((u8 *)((rp) + ((i) >> 2)) + ((i) & 3) + 4)
255#else
256#define REG_BYTE(rp, i) *((u8 *)(rp) + (i))
257#endif
258
259static int emulate_multiple(struct pt_regs *regs, unsigned char __user *addr,
260 unsigned int reg, unsigned int nb,
261 unsigned int flags, unsigned int instr)
262{
263 unsigned long *rptr;
264 unsigned int nb0, i;
265
266 /*
267 * We do not try to emulate 8 bytes multiple as they aren't really
268 * available in our operating environments and we don't try to
269 * emulate multiples operations in kernel land as they should never
270 * be used/generated there at least not on unaligned boundaries
271 */
272 if (unlikely((nb > 4) || !user_mode(regs)))
273 return 0;
274
275 /* lmw, stmw, lswi/x, stswi/x */
276 nb0 = 0;
277 if (flags & HARD) {
278 if (flags & SX) {
279 nb = regs->xer & 127;
280 if (nb == 0)
281 return 1;
282 } else {
283 if (__get_user(instr,
284 (unsigned int __user *)regs->nip))
285 return -EFAULT;
286 nb = (instr >> 11) & 0x1f;
287 if (nb == 0)
288 nb = 32;
201 } 289 }
290 if (nb + reg * 4 > 128) {
291 nb0 = nb + reg * 4 - 128;
292 nb = 128 - reg * 4;
293 }
294 } else {
295 /* lwm, stmw */
296 nb = (32 - reg) * 4;
202 } 297 }
203 298
204 return dsisr; 299 if (!access_ok((flags & ST ? VERIFY_WRITE: VERIFY_READ), addr, nb+nb0))
300 return -EFAULT; /* bad address */
301
302 rptr = &regs->gpr[reg];
303 if (flags & LD) {
304 /*
305 * This zeroes the top 4 bytes of the affected registers
306 * in 64-bit mode, and also zeroes out any remaining
307 * bytes of the last register for lsw*.
308 */
309 memset(rptr, 0, ((nb + 3) / 4) * sizeof(unsigned long));
310 if (nb0 > 0)
311 memset(&regs->gpr[0], 0,
312 ((nb0 + 3) / 4) * sizeof(unsigned long));
313
314 for (i = 0; i < nb; ++i)
315 if (__get_user(REG_BYTE(rptr, i), addr + i))
316 return -EFAULT;
317 if (nb0 > 0) {
318 rptr = &regs->gpr[0];
319 addr += nb;
320 for (i = 0; i < nb0; ++i)
321 if (__get_user(REG_BYTE(rptr, i), addr + i))
322 return -EFAULT;
323 }
324
325 } else {
326 for (i = 0; i < nb; ++i)
327 if (__put_user(REG_BYTE(rptr, i), addr + i))
328 return -EFAULT;
329 if (nb0 > 0) {
330 rptr = &regs->gpr[0];
331 addr += nb;
332 for (i = 0; i < nb0; ++i)
333 if (__put_user(REG_BYTE(rptr, i), addr + i))
334 return -EFAULT;
335 }
336 }
337 return 1;
205} 338}
206 339
207int 340
208fix_alignment(struct pt_regs *regs) 341/*
342 * Called on alignment exception. Attempts to fixup
343 *
344 * Return 1 on success
345 * Return 0 if unable to handle the interrupt
346 * Return -EFAULT if data address is bad
347 */
348
349int fix_alignment(struct pt_regs *regs)
209{ 350{
210 unsigned int instr, nb, flags; 351 unsigned int instr, nb, flags;
211 int t; 352 unsigned int reg, areg;
212 unsigned long reg, areg; 353 unsigned int dsisr;
213 unsigned long i;
214 int ret;
215 unsigned dsisr;
216 unsigned char __user *addr; 354 unsigned char __user *addr;
217 unsigned char __user *p; 355 unsigned char __user *p;
218 unsigned long __user *lp; 356 int ret, t;
219 union { 357 union {
220 long ll; 358 u64 ll;
221 double dd; 359 double dd;
222 unsigned char v[8]; 360 unsigned char v[8];
223 struct { 361 struct {
@@ -231,18 +369,22 @@ fix_alignment(struct pt_regs *regs)
231 } data; 369 } data;
232 370
233 /* 371 /*
234 * Return 1 on success 372 * We require a complete register set, if not, then our assembly
235 * Return 0 if unable to handle the interrupt 373 * is broken
236 * Return -EFAULT if data address is bad
237 */ 374 */
375 CHECK_FULL_REGS(regs);
238 376
239 dsisr = regs->dsisr; 377 dsisr = regs->dsisr;
240 378
379 /* Some processors don't provide us with a DSISR we can use here,
380 * let's make one up from the instruction
381 */
241 if (cpu_has_feature(CPU_FTR_NODSISRALIGN)) { 382 if (cpu_has_feature(CPU_FTR_NODSISRALIGN)) {
242 unsigned int real_instr; 383 unsigned int real_instr;
243 if (__get_user(real_instr, (unsigned int __user *)regs->nip)) 384 if (unlikely(__get_user(real_instr,
244 return 0; 385 (unsigned int __user *)regs->nip)))
245 dsisr = make_dsisr(real_instr); 386 return -EFAULT;
387 dsisr = make_dsisr(real_instr);
246 } 388 }
247 389
248 /* extract the operation and registers from the dsisr */ 390 /* extract the operation and registers from the dsisr */
@@ -258,33 +400,37 @@ fix_alignment(struct pt_regs *regs)
258 /* DAR has the operand effective address */ 400 /* DAR has the operand effective address */
259 addr = (unsigned char __user *)regs->dar; 401 addr = (unsigned char __user *)regs->dar;
260 402
261 /* A size of 0 indicates an instruction we don't support */ 403 /* A size of 0 indicates an instruction we don't support, with
262 /* we also don't support the multiples (lmw, stmw, lmd, stmd) */ 404 * the exception of DCBZ which is handled as a special case here
263 if ((nb == 0) || (flags & M))
264 return 0; /* too hard or invalid instruction */
265
266 /*
267 * Special handling for dcbz
268 * dcbz may give an alignment exception for accesses to caching inhibited
269 * storage
270 */ 405 */
271 if (instr == DCBZ) 406 if (instr == DCBZ)
272 addr = (unsigned char __user *) ((unsigned long)addr & -L1_CACHE_BYTES); 407 return emulate_dcbz(regs, addr);
408 if (unlikely(nb == 0))
409 return 0;
410
411 /* Load/Store Multiple instructions are handled in their own
412 * function
413 */
414 if (flags & M)
415 return emulate_multiple(regs, addr, reg, nb, flags, instr);
273 416
274 /* Verify the address of the operand */ 417 /* Verify the address of the operand */
275 if (user_mode(regs)) { 418 if (unlikely(user_mode(regs) &&
276 if (!access_ok((flags & ST? VERIFY_WRITE: VERIFY_READ), addr, nb)) 419 !access_ok((flags & ST ? VERIFY_WRITE : VERIFY_READ),
277 return -EFAULT; /* bad address */ 420 addr, nb)))
278 } 421 return -EFAULT;
279 422
280 /* Force the fprs into the save area so we can reference them */ 423 /* Force the fprs into the save area so we can reference them */
281 if (flags & F) { 424 if (flags & F) {
282 if (!user_mode(regs)) 425 /* userland only */
426 if (unlikely(!user_mode(regs)))
283 return 0; 427 return 0;
284 flush_fp_to_thread(current); 428 flush_fp_to_thread(current);
285 } 429 }
286 430
287 /* If we are loading, get the data from user space */ 431 /* If we are loading, get the data from user space, else
432 * get it from register values
433 */
288 if (flags & LD) { 434 if (flags & LD) {
289 data.ll = 0; 435 data.ll = 0;
290 ret = 0; 436 ret = 0;
@@ -301,75 +447,62 @@ fix_alignment(struct pt_regs *regs)
301 case 2: 447 case 2:
302 ret |= __get_user(data.v[6], p++); 448 ret |= __get_user(data.v[6], p++);
303 ret |= __get_user(data.v[7], p++); 449 ret |= __get_user(data.v[7], p++);
304 if (ret) 450 if (unlikely(ret))
305 return -EFAULT; 451 return -EFAULT;
306 } 452 }
307 } 453 } else if (flags & F)
308 454 data.dd = current->thread.fpr[reg];
309 /* If we are storing, get the data from the saved gpr or fpr */ 455 else
310 if (flags & ST) { 456 data.ll = regs->gpr[reg];
311 if (flags & F) { 457
312 if (nb == 4) { 458 /* Perform other misc operations like sign extension, byteswap,
313 /* Doing stfs, have to convert to single */ 459 * or floating point single precision conversion
314 preempt_disable(); 460 */
315 enable_kernel_fp(); 461 switch (flags & ~U) {
316 cvt_df(&current->thread.fpr[reg], (float *)&data.v[4], &current->thread); 462 case LD+SE: /* sign extend */
317 disable_kernel_fp();
318 preempt_enable();
319 }
320 else
321 data.dd = current->thread.fpr[reg];
322 }
323 else
324 data.ll = regs->gpr[reg];
325 }
326
327 /* Swap bytes as needed */
328 if (flags & SW) {
329 if (nb == 2)
330 SWAP(data.v[6], data.v[7]);
331 else { /* nb must be 4 */
332 SWAP(data.v[4], data.v[7]);
333 SWAP(data.v[5], data.v[6]);
334 }
335 }
336
337 /* Sign extend as needed */
338 if (flags & SE) {
339 if ( nb == 2 ) 463 if ( nb == 2 )
340 data.ll = data.x16.low16; 464 data.ll = data.x16.low16;
341 else /* nb must be 4 */ 465 else /* nb must be 4 */
342 data.ll = data.x32.low32; 466 data.ll = data.x32.low32;
343 } 467 break;
344 468 case LD+S: /* byte-swap */
345 /* If we are loading, move the data to the gpr or fpr */ 469 case ST+S:
346 if (flags & LD) { 470 if (nb == 2) {
347 if (flags & F) { 471 SWAP(data.v[6], data.v[7]);
348 if (nb == 4) { 472 } else {
349 /* Doing lfs, have to convert to double */ 473 SWAP(data.v[4], data.v[7]);
350 preempt_disable(); 474 SWAP(data.v[5], data.v[6]);
351 enable_kernel_fp();
352 cvt_fd((float *)&data.v[4], &current->thread.fpr[reg], &current->thread);
353 disable_kernel_fp();
354 preempt_enable();
355 }
356 else
357 current->thread.fpr[reg] = data.dd;
358 } 475 }
359 else 476 break;
360 regs->gpr[reg] = data.ll; 477
478 /* Single-precision FP load and store require conversions... */
479 case LD+F+S:
480#ifdef CONFIG_PPC_FPU
481 preempt_disable();
482 enable_kernel_fp();
483 cvt_fd((float *)&data.v[4], &data.dd, &current->thread);
484 preempt_enable();
485#else
486 return 0;
487#endif
488 break;
489 case ST+F+S:
490#ifdef CONFIG_PPC_FPU
491 preempt_disable();
492 enable_kernel_fp();
493 cvt_df(&data.dd, (float *)&data.v[4], &current->thread);
494 preempt_enable();
495#else
496 return 0;
497#endif
498 break;
361 } 499 }
362 500
363 /* If we are storing, copy the data to the user */ 501 /* Store result to memory or update registers */
364 if (flags & ST) { 502 if (flags & ST) {
365 ret = 0; 503 ret = 0;
366 p = addr; 504 p = addr;
367 switch (nb) { 505 switch (nb) {
368 case 128: /* Special case - must be dcbz */
369 lp = (unsigned long __user *)p;
370 for (i = 0; i < L1_CACHE_BYTES / sizeof(long); ++i)
371 ret |= __put_user(0, lp++);
372 break;
373 case 8: 506 case 8:
374 ret |= __put_user(data.v[0], p++); 507 ret |= __put_user(data.v[0], p++);
375 ret |= __put_user(data.v[1], p++); 508 ret |= __put_user(data.v[1], p++);
@@ -382,15 +515,16 @@ fix_alignment(struct pt_regs *regs)
382 ret |= __put_user(data.v[6], p++); 515 ret |= __put_user(data.v[6], p++);
383 ret |= __put_user(data.v[7], p++); 516 ret |= __put_user(data.v[7], p++);
384 } 517 }
385 if (ret) 518 if (unlikely(ret))
386 return -EFAULT; 519 return -EFAULT;
387 } 520 } else if (flags & F)
388 521 current->thread.fpr[reg] = data.dd;
522 else
523 regs->gpr[reg] = data.ll;
524
389 /* Update RA as needed */ 525 /* Update RA as needed */
390 if (flags & U) { 526 if (flags & U)
391 regs->gpr[areg] = regs->dar; 527 regs->gpr[areg] = regs->dar;
392 }
393 528
394 return 1; 529 return 1;
395} 530}
396
diff --git a/arch/ppc/kernel/Makefile b/arch/ppc/kernel/Makefile
index 17a4da65e275..0bb23fce4293 100644
--- a/arch/ppc/kernel/Makefile
+++ b/arch/ppc/kernel/Makefile
@@ -13,7 +13,7 @@ extra-$(CONFIG_POWER4) += idle_power4.o
13extra-y += vmlinux.lds 13extra-y += vmlinux.lds
14 14
15obj-y := entry.o traps.o idle.o time.o misc.o \ 15obj-y := entry.o traps.o idle.o time.o misc.o \
16 process.o align.o \ 16 process.o \
17 setup.o \ 17 setup.o \
18 ppc_htab.o 18 ppc_htab.o
19obj-$(CONFIG_6xx) += l2cr.o cpu_setup_6xx.o 19obj-$(CONFIG_6xx) += l2cr.o cpu_setup_6xx.o
@@ -38,7 +38,7 @@ endif
38# These are here while we do the architecture merge 38# These are here while we do the architecture merge
39 39
40else 40else
41obj-y := idle.o align.o 41obj-y := idle.o
42obj-$(CONFIG_6xx) += l2cr.o cpu_setup_6xx.o 42obj-$(CONFIG_6xx) += l2cr.o cpu_setup_6xx.o
43obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o 43obj-$(CONFIG_SOFTWARE_SUSPEND) += swsusp.o
44obj-$(CONFIG_MODULES) += module.o 44obj-$(CONFIG_MODULES) += module.o
diff --git a/arch/ppc/kernel/align.c b/arch/ppc/kernel/align.c
deleted file mode 100644
index ab398c4b70b6..000000000000
--- a/arch/ppc/kernel/align.c
+++ /dev/null
@@ -1,410 +0,0 @@
1/*
2 * align.c - handle alignment exceptions for the Power PC.
3 *
4 * Copyright (c) 1996 Paul Mackerras <paulus@cs.anu.edu.au>
5 * Copyright (c) 1998-1999 TiVo, Inc.
6 * PowerPC 403GCX modifications.
7 * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
8 * PowerPC 403GCX/405GP modifications.
9 */
10#include <linux/config.h>
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <asm/ptrace.h>
14#include <asm/processor.h>
15#include <asm/uaccess.h>
16#include <asm/system.h>
17#include <asm/cache.h>
18
19struct aligninfo {
20 unsigned char len;
21 unsigned char flags;
22};
23
24#if defined(CONFIG_4xx) || defined(CONFIG_POWER4) || defined(CONFIG_BOOKE)
25#define OPCD(inst) (((inst) & 0xFC000000) >> 26)
26#define RS(inst) (((inst) & 0x03E00000) >> 21)
27#define RA(inst) (((inst) & 0x001F0000) >> 16)
28#define IS_XFORM(code) ((code) == 31)
29#endif
30
31#define INVALID { 0, 0 }
32
33#define LD 1 /* load */
34#define ST 2 /* store */
35#define SE 4 /* sign-extend value */
36#define F 8 /* to/from fp regs */
37#define U 0x10 /* update index register */
38#define M 0x20 /* multiple load/store */
39#define S 0x40 /* single-precision fp, or byte-swap value */
40#define SX 0x40 /* byte count in XER */
41#define HARD 0x80 /* string, stwcx. */
42
43#define DCBZ 0x5f /* 8xx/82xx dcbz faults when cache not enabled */
44
45/*
46 * The PowerPC stores certain bits of the instruction that caused the
47 * alignment exception in the DSISR register. This array maps those
48 * bits to information about the operand length and what the
49 * instruction would do.
50 */
51static struct aligninfo aligninfo[128] = {
52 { 4, LD }, /* 00 0 0000: lwz / lwarx */
53 INVALID, /* 00 0 0001 */
54 { 4, ST }, /* 00 0 0010: stw */
55 INVALID, /* 00 0 0011 */
56 { 2, LD }, /* 00 0 0100: lhz */
57 { 2, LD+SE }, /* 00 0 0101: lha */
58 { 2, ST }, /* 00 0 0110: sth */
59 { 4, LD+M }, /* 00 0 0111: lmw */
60 { 4, LD+F+S }, /* 00 0 1000: lfs */
61 { 8, LD+F }, /* 00 0 1001: lfd */
62 { 4, ST+F+S }, /* 00 0 1010: stfs */
63 { 8, ST+F }, /* 00 0 1011: stfd */
64 INVALID, /* 00 0 1100 */
65 INVALID, /* 00 0 1101: ld/ldu/lwa */
66 INVALID, /* 00 0 1110 */
67 INVALID, /* 00 0 1111: std/stdu */
68 { 4, LD+U }, /* 00 1 0000: lwzu */
69 INVALID, /* 00 1 0001 */
70 { 4, ST+U }, /* 00 1 0010: stwu */
71 INVALID, /* 00 1 0011 */
72 { 2, LD+U }, /* 00 1 0100: lhzu */
73 { 2, LD+SE+U }, /* 00 1 0101: lhau */
74 { 2, ST+U }, /* 00 1 0110: sthu */
75 { 4, ST+M }, /* 00 1 0111: stmw */
76 { 4, LD+F+S+U }, /* 00 1 1000: lfsu */
77 { 8, LD+F+U }, /* 00 1 1001: lfdu */
78 { 4, ST+F+S+U }, /* 00 1 1010: stfsu */
79 { 8, ST+F+U }, /* 00 1 1011: stfdu */
80 INVALID, /* 00 1 1100 */
81 INVALID, /* 00 1 1101 */
82 INVALID, /* 00 1 1110 */
83 INVALID, /* 00 1 1111 */
84 INVALID, /* 01 0 0000: ldx */
85 INVALID, /* 01 0 0001 */
86 INVALID, /* 01 0 0010: stdx */
87 INVALID, /* 01 0 0011 */
88 INVALID, /* 01 0 0100 */
89 INVALID, /* 01 0 0101: lwax */
90 INVALID, /* 01 0 0110 */
91 INVALID, /* 01 0 0111 */
92 { 4, LD+M+HARD+SX }, /* 01 0 1000: lswx */
93 { 4, LD+M+HARD }, /* 01 0 1001: lswi */
94 { 4, ST+M+HARD+SX }, /* 01 0 1010: stswx */
95 { 4, ST+M+HARD }, /* 01 0 1011: stswi */
96 INVALID, /* 01 0 1100 */
97 INVALID, /* 01 0 1101 */
98 INVALID, /* 01 0 1110 */
99 INVALID, /* 01 0 1111 */
100 INVALID, /* 01 1 0000: ldux */
101 INVALID, /* 01 1 0001 */
102 INVALID, /* 01 1 0010: stdux */
103 INVALID, /* 01 1 0011 */
104 INVALID, /* 01 1 0100 */
105 INVALID, /* 01 1 0101: lwaux */
106 INVALID, /* 01 1 0110 */
107 INVALID, /* 01 1 0111 */
108 INVALID, /* 01 1 1000 */
109 INVALID, /* 01 1 1001 */
110 INVALID, /* 01 1 1010 */
111 INVALID, /* 01 1 1011 */
112 INVALID, /* 01 1 1100 */
113 INVALID, /* 01 1 1101 */
114 INVALID, /* 01 1 1110 */
115 INVALID, /* 01 1 1111 */
116 INVALID, /* 10 0 0000 */
117 INVALID, /* 10 0 0001 */
118 { 0, ST+HARD }, /* 10 0 0010: stwcx. */
119 INVALID, /* 10 0 0011 */
120 INVALID, /* 10 0 0100 */
121 INVALID, /* 10 0 0101 */
122 INVALID, /* 10 0 0110 */
123 INVALID, /* 10 0 0111 */
124 { 4, LD+S }, /* 10 0 1000: lwbrx */
125 INVALID, /* 10 0 1001 */
126 { 4, ST+S }, /* 10 0 1010: stwbrx */
127 INVALID, /* 10 0 1011 */
128 { 2, LD+S }, /* 10 0 1100: lhbrx */
129 INVALID, /* 10 0 1101 */
130 { 2, ST+S }, /* 10 0 1110: sthbrx */
131 INVALID, /* 10 0 1111 */
132 INVALID, /* 10 1 0000 */
133 INVALID, /* 10 1 0001 */
134 INVALID, /* 10 1 0010 */
135 INVALID, /* 10 1 0011 */
136 INVALID, /* 10 1 0100 */
137 INVALID, /* 10 1 0101 */
138 INVALID, /* 10 1 0110 */
139 INVALID, /* 10 1 0111 */
140 INVALID, /* 10 1 1000 */
141 INVALID, /* 10 1 1001 */
142 INVALID, /* 10 1 1010 */
143 INVALID, /* 10 1 1011 */
144 INVALID, /* 10 1 1100 */
145 INVALID, /* 10 1 1101 */
146 INVALID, /* 10 1 1110 */
147 { 0, ST+HARD }, /* 10 1 1111: dcbz */
148 { 4, LD }, /* 11 0 0000: lwzx */
149 INVALID, /* 11 0 0001 */
150 { 4, ST }, /* 11 0 0010: stwx */
151 INVALID, /* 11 0 0011 */
152 { 2, LD }, /* 11 0 0100: lhzx */
153 { 2, LD+SE }, /* 11 0 0101: lhax */
154 { 2, ST }, /* 11 0 0110: sthx */
155 INVALID, /* 11 0 0111 */
156 { 4, LD+F+S }, /* 11 0 1000: lfsx */
157 { 8, LD+F }, /* 11 0 1001: lfdx */
158 { 4, ST+F+S }, /* 11 0 1010: stfsx */
159 { 8, ST+F }, /* 11 0 1011: stfdx */
160 INVALID, /* 11 0 1100 */
161 INVALID, /* 11 0 1101: lmd */
162 INVALID, /* 11 0 1110 */
163 INVALID, /* 11 0 1111: stmd */
164 { 4, LD+U }, /* 11 1 0000: lwzux */
165 INVALID, /* 11 1 0001 */
166 { 4, ST+U }, /* 11 1 0010: stwux */
167 INVALID, /* 11 1 0011 */
168 { 2, LD+U }, /* 11 1 0100: lhzux */
169 { 2, LD+SE+U }, /* 11 1 0101: lhaux */
170 { 2, ST+U }, /* 11 1 0110: sthux */
171 INVALID, /* 11 1 0111 */
172 { 4, LD+F+S+U }, /* 11 1 1000: lfsux */
173 { 8, LD+F+U }, /* 11 1 1001: lfdux */
174 { 4, ST+F+S+U }, /* 11 1 1010: stfsux */
175 { 8, ST+F+U }, /* 11 1 1011: stfdux */
176 INVALID, /* 11 1 1100 */
177 INVALID, /* 11 1 1101 */
178 INVALID, /* 11 1 1110 */
179 INVALID, /* 11 1 1111 */
180};
181
182#define SWAP(a, b) (t = (a), (a) = (b), (b) = t)
183
184int
185fix_alignment(struct pt_regs *regs)
186{
187 int instr, nb, flags;
188#if defined(CONFIG_4xx) || defined(CONFIG_POWER4) || defined(CONFIG_BOOKE)
189 int opcode, f1, f2, f3;
190#endif
191 int i, t;
192 int reg, areg;
193 int offset, nb0;
194 unsigned char __user *addr;
195 unsigned char *rptr;
196 union {
197 long l;
198 float f;
199 double d;
200 unsigned char v[8];
201 } data;
202
203 CHECK_FULL_REGS(regs);
204
205#if defined(CONFIG_4xx) || defined(CONFIG_POWER4) || defined(CONFIG_BOOKE)
206 /* The 4xx-family & Book-E processors have no DSISR register,
207 * so we emulate it.
208 * The POWER4 has a DSISR register but doesn't set it on
209 * an alignment fault. -- paulus
210 */
211
212 if (__get_user(instr, (unsigned int __user *) regs->nip))
213 return 0;
214 opcode = OPCD(instr);
215 reg = RS(instr);
216 areg = RA(instr);
217
218 if (!IS_XFORM(opcode)) {
219 f1 = 0;
220 f2 = (instr & 0x04000000) >> 26;
221 f3 = (instr & 0x78000000) >> 27;
222 } else {
223 f1 = (instr & 0x00000006) >> 1;
224 f2 = (instr & 0x00000040) >> 6;
225 f3 = (instr & 0x00000780) >> 7;
226 }
227
228 instr = ((f1 << 5) | (f2 << 4) | f3);
229#else
230 reg = (regs->dsisr >> 5) & 0x1f; /* source/dest register */
231 areg = regs->dsisr & 0x1f; /* register to update */
232 instr = (regs->dsisr >> 10) & 0x7f;
233#endif
234
235 nb = aligninfo[instr].len;
236 if (nb == 0) {
237 long __user *p;
238 int i;
239
240 if (instr != DCBZ)
241 return 0; /* too hard or invalid instruction */
242 /*
243 * The dcbz (data cache block zero) instruction
244 * gives an alignment fault if used on non-cacheable
245 * memory. We handle the fault mainly for the
246 * case when we are running with the cache disabled
247 * for debugging.
248 */
249 p = (long __user *) (regs->dar & -L1_CACHE_BYTES);
250 if (user_mode(regs)
251 && !access_ok(VERIFY_WRITE, p, L1_CACHE_BYTES))
252 return -EFAULT;
253 for (i = 0; i < L1_CACHE_BYTES / sizeof(long); ++i)
254 if (__put_user(0, p+i))
255 return -EFAULT;
256 return 1;
257 }
258
259 flags = aligninfo[instr].flags;
260 if ((flags & (LD|ST)) == 0)
261 return 0;
262
263 /* For the 4xx-family & Book-E processors, the 'dar' field of the
264 * pt_regs structure is overloaded and is really from the DEAR.
265 */
266
267 addr = (unsigned char __user *)regs->dar;
268
269 if (flags & M) {
270 /* lmw, stmw, lswi/x, stswi/x */
271 nb0 = 0;
272 if (flags & HARD) {
273 if (flags & SX) {
274 nb = regs->xer & 127;
275 if (nb == 0)
276 return 1;
277 } else {
278 if (__get_user(instr,
279 (unsigned int __user *)regs->nip))
280 return 0;
281 nb = (instr >> 11) & 0x1f;
282 if (nb == 0)
283 nb = 32;
284 }
285 if (nb + reg * 4 > 128) {
286 nb0 = nb + reg * 4 - 128;
287 nb = 128 - reg * 4;
288 }
289 } else {
290 /* lwm, stmw */
291 nb = (32 - reg) * 4;
292 }
293
294 if (!access_ok((flags & ST? VERIFY_WRITE: VERIFY_READ), addr, nb+nb0))
295 return -EFAULT; /* bad address */
296
297 rptr = (unsigned char *) &regs->gpr[reg];
298 if (flags & LD) {
299 for (i = 0; i < nb; ++i)
300 if (__get_user(rptr[i], addr+i))
301 return -EFAULT;
302 if (nb0 > 0) {
303 rptr = (unsigned char *) &regs->gpr[0];
304 addr += nb;
305 for (i = 0; i < nb0; ++i)
306 if (__get_user(rptr[i], addr+i))
307 return -EFAULT;
308 }
309 for (; (i & 3) != 0; ++i)
310 rptr[i] = 0;
311 } else {
312 for (i = 0; i < nb; ++i)
313 if (__put_user(rptr[i], addr+i))
314 return -EFAULT;
315 if (nb0 > 0) {
316 rptr = (unsigned char *) &regs->gpr[0];
317 addr += nb;
318 for (i = 0; i < nb0; ++i)
319 if (__put_user(rptr[i], addr+i))
320 return -EFAULT;
321 }
322 }
323 return 1;
324 }
325
326 offset = 0;
327 if (nb < 4) {
328 /* read/write the least significant bits */
329 data.l = 0;
330 offset = 4 - nb;
331 }
332
333 /* Verify the address of the operand */
334 if (user_mode(regs)) {
335 if (!access_ok((flags & ST? VERIFY_WRITE: VERIFY_READ), addr, nb))
336 return -EFAULT; /* bad address */
337 }
338
339 if (flags & F) {
340 preempt_disable();
341 if (regs->msr & MSR_FP)
342 giveup_fpu(current);
343 preempt_enable();
344 }
345
346 /* If we read the operand, copy it in, else get register values */
347 if (flags & LD) {
348 for (i = 0; i < nb; ++i)
349 if (__get_user(data.v[offset+i], addr+i))
350 return -EFAULT;
351 } else if (flags & F) {
352 data.d = current->thread.fpr[reg];
353 } else {
354 data.l = regs->gpr[reg];
355 }
356
357 switch (flags & ~U) {
358 case LD+SE: /* sign extend */
359 if (data.v[2] >= 0x80)
360 data.v[0] = data.v[1] = -1;
361 break;
362
363 case LD+S: /* byte-swap */
364 case ST+S:
365 if (nb == 2) {
366 SWAP(data.v[2], data.v[3]);
367 } else {
368 SWAP(data.v[0], data.v[3]);
369 SWAP(data.v[1], data.v[2]);
370 }
371 break;
372
373 /* Single-precision FP load and store require conversions... */
374 case LD+F+S:
375#ifdef CONFIG_PPC_FPU
376 preempt_disable();
377 enable_kernel_fp();
378 cvt_fd(&data.f, &data.d, &current->thread);
379 preempt_enable();
380#else
381 return 0;
382#endif
383 break;
384 case ST+F+S:
385#ifdef CONFIG_PPC_FPU
386 preempt_disable();
387 enable_kernel_fp();
388 cvt_df(&data.d, &data.f, &current->thread);
389 preempt_enable();
390#else
391 return 0;
392#endif
393 break;
394 }
395
396 if (flags & ST) {
397 for (i = 0; i < nb; ++i)
398 if (__put_user(data.v[offset+i], addr+i))
399 return -EFAULT;
400 } else if (flags & F) {
401 current->thread.fpr[reg] = data.d;
402 } else {
403 regs->gpr[reg] = data.l;
404 }
405
406 if (flags & U)
407 regs->gpr[areg] = regs->dar;
408
409 return 1;
410}
diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
index e876c213f5ce..5f0abdb66e0b 100644
--- a/arch/ppc64/kernel/Makefile
+++ b/arch/ppc64/kernel/Makefile
@@ -2,6 +2,6 @@
2# Makefile for the linux ppc64 kernel. 2# Makefile for the linux ppc64 kernel.
3# 3#
4 4
5obj-y += idle.o align.o 5obj-y += idle.o
6 6
7obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o 7obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 10:15:52 -0500