1 /*
2 * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
3 *
4 * Modifications for ppc64:
5 * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
6 *
7 * Copyright 2008 Michael Ellerman, IBM Corporation.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 #include <linux/types.h>
16 #include <linux/jump_label.h>
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/init.h>
20 #include <linux/sched/mm.h>
21 #include <asm/cputable.h>
22 #include <asm/code-patching.h>
23 #include <asm/page.h>
24 #include <asm/sections.h>
25 #include <asm/setup.h>
26 #include <asm/security_features.h>
27 #include <asm/firmware.h>
28
29 struct fixup_entry {
30 unsigned long mask;
31 unsigned long value;
32 long start_off;
33 long end_off;
34 long alt_start_off;
35 long alt_end_off;
36 };
37
calc_addr(struct fixup_entry * fcur,long offset)38 static unsigned int *calc_addr(struct fixup_entry *fcur, long offset)
39 {
40 /*
41 * We store the offset to the code as a negative offset from
42 * the start of the alt_entry, to support the VDSO. This
43 * routine converts that back into an actual address.
44 */
45 return (unsigned int *)((unsigned long)fcur + offset);
46 }
47
patch_alt_instruction(unsigned int * src,unsigned int * dest,unsigned int * alt_start,unsigned int * alt_end)48 static int patch_alt_instruction(unsigned int *src, unsigned int *dest,
49 unsigned int *alt_start, unsigned int *alt_end)
50 {
51 unsigned int instr;
52
53 instr = *src;
54
55 if (instr_is_relative_branch(*src)) {
56 unsigned int *target = (unsigned int *)branch_target(src);
57
58 /* Branch within the section doesn't need translating */
59 if (target < alt_start || target > alt_end) {
60 instr = translate_branch(dest, src);
61 if (!instr)
62 return 1;
63 }
64 }
65
66 raw_patch_instruction(dest, instr);
67
68 return 0;
69 }
70
patch_feature_section(unsigned long value,struct fixup_entry * fcur)71 static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
72 {
73 unsigned int *start, *end, *alt_start, *alt_end, *src, *dest;
74
75 start = calc_addr(fcur, fcur->start_off);
76 end = calc_addr(fcur, fcur->end_off);
77 alt_start = calc_addr(fcur, fcur->alt_start_off);
78 alt_end = calc_addr(fcur, fcur->alt_end_off);
79
80 if ((alt_end - alt_start) > (end - start))
81 return 1;
82
83 if ((value & fcur->mask) == fcur->value)
84 return 0;
85
86 src = alt_start;
87 dest = start;
88
89 for (; src < alt_end; src++, dest++) {
90 if (patch_alt_instruction(src, dest, alt_start, alt_end))
91 return 1;
92 }
93
94 for (; dest < end; dest++)
95 raw_patch_instruction(dest, PPC_INST_NOP);
96
97 return 0;
98 }
99
do_feature_fixups(unsigned long value,void * fixup_start,void * fixup_end)100 void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
101 {
102 struct fixup_entry *fcur, *fend;
103
104 fcur = fixup_start;
105 fend = fixup_end;
106
107 for (; fcur < fend; fcur++) {
108 if (patch_feature_section(value, fcur)) {
109 WARN_ON(1);
110 printk("Unable to patch feature section at %p - %p" \
111 " with %p - %p\n",
112 calc_addr(fcur, fcur->start_off),
113 calc_addr(fcur, fcur->end_off),
114 calc_addr(fcur, fcur->alt_start_off),
115 calc_addr(fcur, fcur->alt_end_off));
116 }
117 }
118 }
119
120 #ifdef CONFIG_PPC_BOOK3S_64
do_stf_entry_barrier_fixups(enum stf_barrier_type types)121 void do_stf_entry_barrier_fixups(enum stf_barrier_type types)
122 {
123 unsigned int instrs[3], *dest;
124 long *start, *end;
125 int i;
126
127 start = PTRRELOC(&__start___stf_entry_barrier_fixup),
128 end = PTRRELOC(&__stop___stf_entry_barrier_fixup);
129
130 instrs[0] = 0x60000000; /* nop */
131 instrs[1] = 0x60000000; /* nop */
132 instrs[2] = 0x60000000; /* nop */
133
134 i = 0;
135 if (types & STF_BARRIER_FALLBACK) {
136 instrs[i++] = 0x7d4802a6; /* mflr r10 */
137 instrs[i++] = 0x60000000; /* branch patched below */
138 instrs[i++] = 0x7d4803a6; /* mtlr r10 */
139 } else if (types & STF_BARRIER_EIEIO) {
140 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */
141 } else if (types & STF_BARRIER_SYNC_ORI) {
142 instrs[i++] = 0x7c0004ac; /* hwsync */
143 instrs[i++] = 0xe94d0000; /* ld r10,0(r13) */
144 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
145 }
146
147 for (i = 0; start < end; start++, i++) {
148 dest = (void *)start + *start;
149
150 pr_devel("patching dest %lx\n", (unsigned long)dest);
151
152 patch_instruction(dest, instrs[0]);
153
154 if (types & STF_BARRIER_FALLBACK)
155 patch_branch(dest + 1, (unsigned long)&stf_barrier_fallback,
156 BRANCH_SET_LINK);
157 else
158 patch_instruction(dest + 1, instrs[1]);
159
160 patch_instruction(dest + 2, instrs[2]);
161 }
162
163 printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i,
164 (types == STF_BARRIER_NONE) ? "no" :
165 (types == STF_BARRIER_FALLBACK) ? "fallback" :
166 (types == STF_BARRIER_EIEIO) ? "eieio" :
167 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
168 : "unknown");
169 }
170
do_stf_exit_barrier_fixups(enum stf_barrier_type types)171 void do_stf_exit_barrier_fixups(enum stf_barrier_type types)
172 {
173 unsigned int instrs[6], *dest;
174 long *start, *end;
175 int i;
176
177 start = PTRRELOC(&__start___stf_exit_barrier_fixup),
178 end = PTRRELOC(&__stop___stf_exit_barrier_fixup);
179
180 instrs[0] = 0x60000000; /* nop */
181 instrs[1] = 0x60000000; /* nop */
182 instrs[2] = 0x60000000; /* nop */
183 instrs[3] = 0x60000000; /* nop */
184 instrs[4] = 0x60000000; /* nop */
185 instrs[5] = 0x60000000; /* nop */
186
187 i = 0;
188 if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) {
189 if (cpu_has_feature(CPU_FTR_HVMODE)) {
190 instrs[i++] = 0x7db14ba6; /* mtspr 0x131, r13 (HSPRG1) */
191 instrs[i++] = 0x7db04aa6; /* mfspr r13, 0x130 (HSPRG0) */
192 } else {
193 instrs[i++] = 0x7db243a6; /* mtsprg 2,r13 */
194 instrs[i++] = 0x7db142a6; /* mfsprg r13,1 */
195 }
196 instrs[i++] = 0x7c0004ac; /* hwsync */
197 instrs[i++] = 0xe9ad0000; /* ld r13,0(r13) */
198 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
199 if (cpu_has_feature(CPU_FTR_HVMODE)) {
200 instrs[i++] = 0x7db14aa6; /* mfspr r13, 0x131 (HSPRG1) */
201 } else {
202 instrs[i++] = 0x7db242a6; /* mfsprg r13,2 */
203 }
204 } else if (types & STF_BARRIER_EIEIO) {
205 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */
206 }
207
208 for (i = 0; start < end; start++, i++) {
209 dest = (void *)start + *start;
210
211 pr_devel("patching dest %lx\n", (unsigned long)dest);
212
213 patch_instruction(dest, instrs[0]);
214 patch_instruction(dest + 1, instrs[1]);
215 patch_instruction(dest + 2, instrs[2]);
216 patch_instruction(dest + 3, instrs[3]);
217 patch_instruction(dest + 4, instrs[4]);
218 patch_instruction(dest + 5, instrs[5]);
219 }
220 printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i,
221 (types == STF_BARRIER_NONE) ? "no" :
222 (types == STF_BARRIER_FALLBACK) ? "fallback" :
223 (types == STF_BARRIER_EIEIO) ? "eieio" :
224 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
225 : "unknown");
226 }
227
228
do_stf_barrier_fixups(enum stf_barrier_type types)229 void do_stf_barrier_fixups(enum stf_barrier_type types)
230 {
231 do_stf_entry_barrier_fixups(types);
232 do_stf_exit_barrier_fixups(types);
233 }
234
do_rfi_flush_fixups(enum l1d_flush_type types)235 void do_rfi_flush_fixups(enum l1d_flush_type types)
236 {
237 unsigned int instrs[3], *dest;
238 long *start, *end;
239 int i;
240
241 start = PTRRELOC(&__start___rfi_flush_fixup),
242 end = PTRRELOC(&__stop___rfi_flush_fixup);
243
244 instrs[0] = 0x60000000; /* nop */
245 instrs[1] = 0x60000000; /* nop */
246 instrs[2] = 0x60000000; /* nop */
247
248 if (types & L1D_FLUSH_FALLBACK)
249 /* b .+16 to fallback flush */
250 instrs[0] = 0x48000010;
251
252 i = 0;
253 if (types & L1D_FLUSH_ORI) {
254 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
255 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
256 }
257
258 if (types & L1D_FLUSH_MTTRIG)
259 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
260
261 for (i = 0; start < end; start++, i++) {
262 dest = (void *)start + *start;
263
264 pr_devel("patching dest %lx\n", (unsigned long)dest);
265
266 patch_instruction(dest, instrs[0]);
267 patch_instruction(dest + 1, instrs[1]);
268 patch_instruction(dest + 2, instrs[2]);
269 }
270
271 printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
272 (types == L1D_FLUSH_NONE) ? "no" :
273 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
274 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
275 ? "ori+mttrig type"
276 : "ori type" :
277 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
278 : "unknown");
279 }
280
do_barrier_nospec_fixups_range(bool enable,void * fixup_start,void * fixup_end)281 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
282 {
283 unsigned int instr, *dest;
284 long *start, *end;
285 int i;
286
287 start = fixup_start;
288 end = fixup_end;
289
290 instr = 0x60000000; /* nop */
291
292 if (enable) {
293 pr_info("barrier-nospec: using ORI speculation barrier\n");
294 instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */
295 }
296
297 for (i = 0; start < end; start++, i++) {
298 dest = (void *)start + *start;
299
300 pr_devel("patching dest %lx\n", (unsigned long)dest);
301 patch_instruction(dest, instr);
302 }
303
304 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
305 }
306
307 #endif /* CONFIG_PPC_BOOK3S_64 */
308
309 #ifdef CONFIG_PPC_BARRIER_NOSPEC
do_barrier_nospec_fixups(bool enable)310 void do_barrier_nospec_fixups(bool enable)
311 {
312 void *start, *end;
313
314 start = PTRRELOC(&__start___barrier_nospec_fixup),
315 end = PTRRELOC(&__stop___barrier_nospec_fixup);
316
317 do_barrier_nospec_fixups_range(enable, start, end);
318 }
319 #endif /* CONFIG_PPC_BARRIER_NOSPEC */
320
321 #ifdef CONFIG_PPC_FSL_BOOK3E
do_barrier_nospec_fixups_range(bool enable,void * fixup_start,void * fixup_end)322 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
323 {
324 unsigned int instr[2], *dest;
325 long *start, *end;
326 int i;
327
328 start = fixup_start;
329 end = fixup_end;
330
331 instr[0] = PPC_INST_NOP;
332 instr[1] = PPC_INST_NOP;
333
334 if (enable) {
335 pr_info("barrier-nospec: using isync; sync as speculation barrier\n");
336 instr[0] = PPC_INST_ISYNC;
337 instr[1] = PPC_INST_SYNC;
338 }
339
340 for (i = 0; start < end; start++, i++) {
341 dest = (void *)start + *start;
342
343 pr_devel("patching dest %lx\n", (unsigned long)dest);
344 patch_instruction(dest, instr[0]);
345 patch_instruction(dest + 1, instr[1]);
346 }
347
348 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
349 }
350 #endif /* CONFIG_PPC_FSL_BOOK3E */
351
do_lwsync_fixups(unsigned long value,void * fixup_start,void * fixup_end)352 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
353 {
354 long *start, *end;
355 unsigned int *dest;
356
357 if (!(value & CPU_FTR_LWSYNC))
358 return ;
359
360 start = fixup_start;
361 end = fixup_end;
362
363 for (; start < end; start++) {
364 dest = (void *)start + *start;
365 raw_patch_instruction(dest, PPC_INST_LWSYNC);
366 }
367 }
368
do_final_fixups(void)369 static void do_final_fixups(void)
370 {
371 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
372 int *src, *dest;
373 unsigned long length;
374
375 if (PHYSICAL_START == 0)
376 return;
377
378 src = (int *)(KERNELBASE + PHYSICAL_START);
379 dest = (int *)KERNELBASE;
380 length = (__end_interrupts - _stext) / sizeof(int);
381
382 while (length--) {
383 raw_patch_instruction(dest, *src);
384 src++;
385 dest++;
386 }
387 #endif
388 }
389
390 static unsigned long __initdata saved_cpu_features;
391 static unsigned int __initdata saved_mmu_features;
392 #ifdef CONFIG_PPC64
393 static unsigned long __initdata saved_firmware_features;
394 #endif
395
apply_feature_fixups(void)396 void __init apply_feature_fixups(void)
397 {
398 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec));
399
400 *PTRRELOC(&saved_cpu_features) = spec->cpu_features;
401 *PTRRELOC(&saved_mmu_features) = spec->mmu_features;
402
403 /*
404 * Apply the CPU-specific and firmware specific fixups to kernel text
405 * (nop out sections not relevant to this CPU or this firmware).
406 */
407 do_feature_fixups(spec->cpu_features,
408 PTRRELOC(&__start___ftr_fixup),
409 PTRRELOC(&__stop___ftr_fixup));
410
411 do_feature_fixups(spec->mmu_features,
412 PTRRELOC(&__start___mmu_ftr_fixup),
413 PTRRELOC(&__stop___mmu_ftr_fixup));
414
415 do_lwsync_fixups(spec->cpu_features,
416 PTRRELOC(&__start___lwsync_fixup),
417 PTRRELOC(&__stop___lwsync_fixup));
418
419 #ifdef CONFIG_PPC64
420 saved_firmware_features = powerpc_firmware_features;
421 do_feature_fixups(powerpc_firmware_features,
422 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
423 #endif
424 do_final_fixups();
425 }
426
setup_feature_keys(void)427 void __init setup_feature_keys(void)
428 {
429 /*
430 * Initialise jump label. This causes all the cpu/mmu_has_feature()
431 * checks to take on their correct polarity based on the current set of
432 * CPU/MMU features.
433 */
434 jump_label_init();
435 cpu_feature_keys_init();
436 mmu_feature_keys_init();
437 }
438
check_features(void)439 static int __init check_features(void)
440 {
441 WARN(saved_cpu_features != cur_cpu_spec->cpu_features,
442 "CPU features changed after feature patching!\n");
443 WARN(saved_mmu_features != cur_cpu_spec->mmu_features,
444 "MMU features changed after feature patching!\n");
445 #ifdef CONFIG_PPC64
446 WARN(saved_firmware_features != powerpc_firmware_features,
447 "Firmware features changed after feature patching!\n");
448 #endif
449
450 return 0;
451 }
452 late_initcall(check_features);
453
454 #ifdef CONFIG_FTR_FIXUP_SELFTEST
455
456 #define check(x) \
457 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
458
459 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
460 static struct fixup_entry fixup;
461
calc_offset(struct fixup_entry * entry,unsigned int * p)462 static long calc_offset(struct fixup_entry *entry, unsigned int *p)
463 {
464 return (unsigned long)p - (unsigned long)entry;
465 }
466
test_basic_patching(void)467 static void test_basic_patching(void)
468 {
469 extern unsigned int ftr_fixup_test1[];
470 extern unsigned int end_ftr_fixup_test1[];
471 extern unsigned int ftr_fixup_test1_orig[];
472 extern unsigned int ftr_fixup_test1_expected[];
473 int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1);
474
475 fixup.value = fixup.mask = 8;
476 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1);
477 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2);
478 fixup.alt_start_off = fixup.alt_end_off = 0;
479
480 /* Sanity check */
481 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
482
483 /* Check we don't patch if the value matches */
484 patch_feature_section(8, &fixup);
485 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
486
487 /* Check we do patch if the value doesn't match */
488 patch_feature_section(0, &fixup);
489 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
490
491 /* Check we do patch if the mask doesn't match */
492 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size);
493 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
494 patch_feature_section(~8, &fixup);
495 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
496 }
497
test_alternative_patching(void)498 static void test_alternative_patching(void)
499 {
500 extern unsigned int ftr_fixup_test2[];
501 extern unsigned int end_ftr_fixup_test2[];
502 extern unsigned int ftr_fixup_test2_orig[];
503 extern unsigned int ftr_fixup_test2_alt[];
504 extern unsigned int ftr_fixup_test2_expected[];
505 int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2);
506
507 fixup.value = fixup.mask = 0xF;
508 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1);
509 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2);
510 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt);
511 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1);
512
513 /* Sanity check */
514 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
515
516 /* Check we don't patch if the value matches */
517 patch_feature_section(0xF, &fixup);
518 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
519
520 /* Check we do patch if the value doesn't match */
521 patch_feature_section(0, &fixup);
522 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
523
524 /* Check we do patch if the mask doesn't match */
525 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size);
526 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
527 patch_feature_section(~0xF, &fixup);
528 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
529 }
530
test_alternative_case_too_big(void)531 static void test_alternative_case_too_big(void)
532 {
533 extern unsigned int ftr_fixup_test3[];
534 extern unsigned int end_ftr_fixup_test3[];
535 extern unsigned int ftr_fixup_test3_orig[];
536 extern unsigned int ftr_fixup_test3_alt[];
537 int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3);
538
539 fixup.value = fixup.mask = 0xC;
540 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1);
541 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2);
542 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt);
543 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2);
544
545 /* Sanity check */
546 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
547
548 /* Expect nothing to be patched, and the error returned to us */
549 check(patch_feature_section(0xF, &fixup) == 1);
550 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
551 check(patch_feature_section(0, &fixup) == 1);
552 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
553 check(patch_feature_section(~0xF, &fixup) == 1);
554 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
555 }
556
test_alternative_case_too_small(void)557 static void test_alternative_case_too_small(void)
558 {
559 extern unsigned int ftr_fixup_test4[];
560 extern unsigned int end_ftr_fixup_test4[];
561 extern unsigned int ftr_fixup_test4_orig[];
562 extern unsigned int ftr_fixup_test4_alt[];
563 extern unsigned int ftr_fixup_test4_expected[];
564 int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4);
565 unsigned long flag;
566
567 /* Check a high-bit flag */
568 flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
569 fixup.value = fixup.mask = flag;
570 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1);
571 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5);
572 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt);
573 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2);
574
575 /* Sanity check */
576 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
577
578 /* Check we don't patch if the value matches */
579 patch_feature_section(flag, &fixup);
580 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
581
582 /* Check we do patch if the value doesn't match */
583 patch_feature_section(0, &fixup);
584 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
585
586 /* Check we do patch if the mask doesn't match */
587 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size);
588 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
589 patch_feature_section(~flag, &fixup);
590 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
591 }
592
test_alternative_case_with_branch(void)593 static void test_alternative_case_with_branch(void)
594 {
595 extern unsigned int ftr_fixup_test5[];
596 extern unsigned int end_ftr_fixup_test5[];
597 extern unsigned int ftr_fixup_test5_expected[];
598 int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5);
599
600 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0);
601 }
602
test_alternative_case_with_external_branch(void)603 static void test_alternative_case_with_external_branch(void)
604 {
605 extern unsigned int ftr_fixup_test6[];
606 extern unsigned int end_ftr_fixup_test6[];
607 extern unsigned int ftr_fixup_test6_expected[];
608 int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6);
609
610 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0);
611 }
612
test_alternative_case_with_branch_to_end(void)613 static void test_alternative_case_with_branch_to_end(void)
614 {
615 extern unsigned int ftr_fixup_test7[];
616 extern unsigned int end_ftr_fixup_test7[];
617 extern unsigned int ftr_fixup_test7_expected[];
618 int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7);
619
620 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0);
621 }
622
test_cpu_macros(void)623 static void test_cpu_macros(void)
624 {
625 extern u8 ftr_fixup_test_FTR_macros[];
626 extern u8 ftr_fixup_test_FTR_macros_expected[];
627 unsigned long size = ftr_fixup_test_FTR_macros_expected -
628 ftr_fixup_test_FTR_macros;
629
630 /* The fixups have already been done for us during boot */
631 check(memcmp(ftr_fixup_test_FTR_macros,
632 ftr_fixup_test_FTR_macros_expected, size) == 0);
633 }
634
test_fw_macros(void)635 static void test_fw_macros(void)
636 {
637 #ifdef CONFIG_PPC64
638 extern u8 ftr_fixup_test_FW_FTR_macros[];
639 extern u8 ftr_fixup_test_FW_FTR_macros_expected[];
640 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected -
641 ftr_fixup_test_FW_FTR_macros;
642
643 /* The fixups have already been done for us during boot */
644 check(memcmp(ftr_fixup_test_FW_FTR_macros,
645 ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
646 #endif
647 }
648
test_lwsync_macros(void)649 static void test_lwsync_macros(void)
650 {
651 extern u8 lwsync_fixup_test[];
652 extern u8 end_lwsync_fixup_test[];
653 extern u8 lwsync_fixup_test_expected_LWSYNC[];
654 extern u8 lwsync_fixup_test_expected_SYNC[];
655 unsigned long size = end_lwsync_fixup_test -
656 lwsync_fixup_test;
657
658 /* The fixups have already been done for us during boot */
659 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
660 check(memcmp(lwsync_fixup_test,
661 lwsync_fixup_test_expected_LWSYNC, size) == 0);
662 } else {
663 check(memcmp(lwsync_fixup_test,
664 lwsync_fixup_test_expected_SYNC, size) == 0);
665 }
666 }
667
test_feature_fixups(void)668 static int __init test_feature_fixups(void)
669 {
670 printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
671
672 test_basic_patching();
673 test_alternative_patching();
674 test_alternative_case_too_big();
675 test_alternative_case_too_small();
676 test_alternative_case_with_branch();
677 test_alternative_case_with_external_branch();
678 test_alternative_case_with_branch_to_end();
679 test_cpu_macros();
680 test_fw_macros();
681 test_lwsync_macros();
682
683 return 0;
684 }
685 late_initcall(test_feature_fixups);
686
687 #endif /* CONFIG_FTR_FIXUP_SELFTEST */
688
