1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
5 * Modifications for ppc64:
6 * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
8 * Copyright 2008 Michael Ellerman, IBM Corporation.
11 #include <linux/types.h>
12 #include <linux/jump_label.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/init.h>
16 #include <linux/sched/mm.h>
17 #include <asm/cputable.h>
18 #include <asm/code-patching.h>
20 #include <asm/sections.h>
21 #include <asm/setup.h>
22 #include <asm/security_features.h>
23 #include <asm/firmware.h>
35 static struct ppc_inst *calc_addr(struct fixup_entry *fcur, long offset)
38 * We store the offset to the code as a negative offset from
39 * the start of the alt_entry, to support the VDSO. This
40 * routine converts that back into an actual address.
42 return (struct ppc_inst *)((unsigned long)fcur + offset);
45 static int patch_alt_instruction(struct ppc_inst *src, struct ppc_inst *dest,
46 struct ppc_inst *alt_start, struct ppc_inst *alt_end)
49 struct ppc_inst instr;
51 instr = ppc_inst_read(src);
53 if (instr_is_relative_branch(*src)) {
54 struct ppc_inst *target = (struct ppc_inst *)branch_target(src);
56 /* Branch within the section doesn't need translating */
57 if (target < alt_start || target > alt_end) {
58 err = translate_branch(&instr, dest, src);
64 raw_patch_instruction(dest, instr);
69 static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
71 struct ppc_inst *start, *end, *alt_start, *alt_end, *src, *dest, nop;
73 start = calc_addr(fcur, fcur->start_off);
74 end = calc_addr(fcur, fcur->end_off);
75 alt_start = calc_addr(fcur, fcur->alt_start_off);
76 alt_end = calc_addr(fcur, fcur->alt_end_off);
78 if ((alt_end - alt_start) > (end - start))
81 if ((value & fcur->mask) == fcur->value)
87 for (; src < alt_end; src = ppc_inst_next(src, src),
88 dest = ppc_inst_next(dest, dest)) {
89 if (patch_alt_instruction(src, dest, alt_start, alt_end))
93 nop = ppc_inst(PPC_INST_NOP);
94 for (; dest < end; dest = ppc_inst_next(dest, &nop))
95 raw_patch_instruction(dest, nop);
100 void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end)
102 struct fixup_entry *fcur, *fend;
107 for (; fcur < fend; fcur++) {
108 if (patch_feature_section(value, fcur)) {
110 printk("Unable to patch feature section at %p - %p" \
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));
120 #ifdef CONFIG_PPC_BOOK3S_64
121 static void do_stf_entry_barrier_fixups(enum stf_barrier_type types)
123 unsigned int instrs[3], *dest;
127 start = PTRRELOC(&__start___stf_entry_barrier_fixup);
128 end = PTRRELOC(&__stop___stf_entry_barrier_fixup);
130 instrs[0] = 0x60000000; /* nop */
131 instrs[1] = 0x60000000; /* nop */
132 instrs[2] = 0x60000000; /* nop */
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 */
147 for (i = 0; start < end; start++, i++) {
148 dest = (void *)start + *start;
150 pr_devel("patching dest %lx\n", (unsigned long)dest);
152 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
154 if (types & STF_BARRIER_FALLBACK)
155 patch_branch((struct ppc_inst *)(dest + 1),
156 (unsigned long)&stf_barrier_fallback,
159 patch_instruction((struct ppc_inst *)(dest + 1),
160 ppc_inst(instrs[1]));
162 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
165 printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i,
166 (types == STF_BARRIER_NONE) ? "no" :
167 (types == STF_BARRIER_FALLBACK) ? "fallback" :
168 (types == STF_BARRIER_EIEIO) ? "eieio" :
169 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
173 static void do_stf_exit_barrier_fixups(enum stf_barrier_type types)
175 unsigned int instrs[6], *dest;
179 start = PTRRELOC(&__start___stf_exit_barrier_fixup);
180 end = PTRRELOC(&__stop___stf_exit_barrier_fixup);
182 instrs[0] = 0x60000000; /* nop */
183 instrs[1] = 0x60000000; /* nop */
184 instrs[2] = 0x60000000; /* nop */
185 instrs[3] = 0x60000000; /* nop */
186 instrs[4] = 0x60000000; /* nop */
187 instrs[5] = 0x60000000; /* nop */
190 if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) {
191 if (cpu_has_feature(CPU_FTR_HVMODE)) {
192 instrs[i++] = 0x7db14ba6; /* mtspr 0x131, r13 (HSPRG1) */
193 instrs[i++] = 0x7db04aa6; /* mfspr r13, 0x130 (HSPRG0) */
195 instrs[i++] = 0x7db243a6; /* mtsprg 2,r13 */
196 instrs[i++] = 0x7db142a6; /* mfsprg r13,1 */
198 instrs[i++] = 0x7c0004ac; /* hwsync */
199 instrs[i++] = 0xe9ad0000; /* ld r13,0(r13) */
200 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
201 if (cpu_has_feature(CPU_FTR_HVMODE)) {
202 instrs[i++] = 0x7db14aa6; /* mfspr r13, 0x131 (HSPRG1) */
204 instrs[i++] = 0x7db242a6; /* mfsprg r13,2 */
206 } else if (types & STF_BARRIER_EIEIO) {
207 instrs[i++] = 0x7e0006ac; /* eieio + bit 6 hint */
210 for (i = 0; start < end; start++, i++) {
211 dest = (void *)start + *start;
213 pr_devel("patching dest %lx\n", (unsigned long)dest);
215 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
216 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
217 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
218 patch_instruction((struct ppc_inst *)(dest + 3), ppc_inst(instrs[3]));
219 patch_instruction((struct ppc_inst *)(dest + 4), ppc_inst(instrs[4]));
220 patch_instruction((struct ppc_inst *)(dest + 5), ppc_inst(instrs[5]));
222 printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i,
223 (types == STF_BARRIER_NONE) ? "no" :
224 (types == STF_BARRIER_FALLBACK) ? "fallback" :
225 (types == STF_BARRIER_EIEIO) ? "eieio" :
226 (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync"
231 void do_stf_barrier_fixups(enum stf_barrier_type types)
233 do_stf_entry_barrier_fixups(types);
234 do_stf_exit_barrier_fixups(types);
237 void do_uaccess_flush_fixups(enum l1d_flush_type types)
239 unsigned int instrs[4], *dest;
243 start = PTRRELOC(&__start___uaccess_flush_fixup);
244 end = PTRRELOC(&__stop___uaccess_flush_fixup);
246 instrs[0] = 0x60000000; /* nop */
247 instrs[1] = 0x60000000; /* nop */
248 instrs[2] = 0x60000000; /* nop */
249 instrs[3] = 0x4e800020; /* blr */
252 if (types == L1D_FLUSH_FALLBACK) {
253 instrs[3] = 0x60000000; /* nop */
254 /* fallthrough to fallback flush */
257 if (types & L1D_FLUSH_ORI) {
258 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
259 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
262 if (types & L1D_FLUSH_MTTRIG)
263 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
265 for (i = 0; start < end; start++, i++) {
266 dest = (void *)start + *start;
268 pr_devel("patching dest %lx\n", (unsigned long)dest);
270 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
272 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
273 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
274 patch_instruction((struct ppc_inst *)(dest + 3), ppc_inst(instrs[3]));
277 printk(KERN_DEBUG "uaccess-flush: patched %d locations (%s flush)\n", i,
278 (types == L1D_FLUSH_NONE) ? "no" :
279 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
280 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
283 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
287 void do_entry_flush_fixups(enum l1d_flush_type types)
289 unsigned int instrs[3], *dest;
293 instrs[0] = 0x60000000; /* nop */
294 instrs[1] = 0x60000000; /* nop */
295 instrs[2] = 0x60000000; /* nop */
298 if (types == L1D_FLUSH_FALLBACK) {
299 instrs[i++] = 0x7d4802a6; /* mflr r10 */
300 instrs[i++] = 0x60000000; /* branch patched below */
301 instrs[i++] = 0x7d4803a6; /* mtlr r10 */
304 if (types & L1D_FLUSH_ORI) {
305 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
306 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
309 if (types & L1D_FLUSH_MTTRIG)
310 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
312 start = PTRRELOC(&__start___entry_flush_fixup);
313 end = PTRRELOC(&__stop___entry_flush_fixup);
314 for (i = 0; start < end; start++, i++) {
315 dest = (void *)start + *start;
317 pr_devel("patching dest %lx\n", (unsigned long)dest);
319 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
321 if (types == L1D_FLUSH_FALLBACK)
322 patch_branch((struct ppc_inst *)(dest + 1), (unsigned long)&entry_flush_fallback,
325 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
327 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
330 start = PTRRELOC(&__start___scv_entry_flush_fixup);
331 end = PTRRELOC(&__stop___scv_entry_flush_fixup);
332 for (; start < end; start++, i++) {
333 dest = (void *)start + *start;
335 pr_devel("patching dest %lx\n", (unsigned long)dest);
337 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
339 if (types == L1D_FLUSH_FALLBACK)
340 patch_branch((struct ppc_inst *)(dest + 1), (unsigned long)&scv_entry_flush_fallback,
343 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
345 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
349 printk(KERN_DEBUG "entry-flush: patched %d locations (%s flush)\n", i,
350 (types == L1D_FLUSH_NONE) ? "no" :
351 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
352 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
355 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
359 void do_rfi_flush_fixups(enum l1d_flush_type types)
361 unsigned int instrs[3], *dest;
365 start = PTRRELOC(&__start___rfi_flush_fixup);
366 end = PTRRELOC(&__stop___rfi_flush_fixup);
368 instrs[0] = 0x60000000; /* nop */
369 instrs[1] = 0x60000000; /* nop */
370 instrs[2] = 0x60000000; /* nop */
372 if (types & L1D_FLUSH_FALLBACK)
373 /* b .+16 to fallback flush */
374 instrs[0] = 0x48000010;
377 if (types & L1D_FLUSH_ORI) {
378 instrs[i++] = 0x63ff0000; /* ori 31,31,0 speculation barrier */
379 instrs[i++] = 0x63de0000; /* ori 30,30,0 L1d flush*/
382 if (types & L1D_FLUSH_MTTRIG)
383 instrs[i++] = 0x7c12dba6; /* mtspr TRIG2,r0 (SPR #882) */
385 for (i = 0; start < end; start++, i++) {
386 dest = (void *)start + *start;
388 pr_devel("patching dest %lx\n", (unsigned long)dest);
390 patch_instruction((struct ppc_inst *)dest, ppc_inst(instrs[0]));
391 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instrs[1]));
392 patch_instruction((struct ppc_inst *)(dest + 2), ppc_inst(instrs[2]));
395 printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
396 (types == L1D_FLUSH_NONE) ? "no" :
397 (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
398 (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
401 (types & L1D_FLUSH_MTTRIG) ? "mttrig type"
405 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
407 unsigned int instr, *dest;
414 instr = 0x60000000; /* nop */
417 pr_info("barrier-nospec: using ORI speculation barrier\n");
418 instr = 0x63ff0000; /* ori 31,31,0 speculation barrier */
421 for (i = 0; start < end; start++, i++) {
422 dest = (void *)start + *start;
424 pr_devel("patching dest %lx\n", (unsigned long)dest);
425 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr));
428 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
431 #endif /* CONFIG_PPC_BOOK3S_64 */
433 #ifdef CONFIG_PPC_BARRIER_NOSPEC
434 void do_barrier_nospec_fixups(bool enable)
438 start = PTRRELOC(&__start___barrier_nospec_fixup);
439 end = PTRRELOC(&__stop___barrier_nospec_fixup);
441 do_barrier_nospec_fixups_range(enable, start, end);
443 #endif /* CONFIG_PPC_BARRIER_NOSPEC */
445 #ifdef CONFIG_PPC_FSL_BOOK3E
446 void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end)
448 unsigned int instr[2], *dest;
455 instr[0] = PPC_INST_NOP;
456 instr[1] = PPC_INST_NOP;
459 pr_info("barrier-nospec: using isync; sync as speculation barrier\n");
460 instr[0] = PPC_INST_ISYNC;
461 instr[1] = PPC_INST_SYNC;
464 for (i = 0; start < end; start++, i++) {
465 dest = (void *)start + *start;
467 pr_devel("patching dest %lx\n", (unsigned long)dest);
468 patch_instruction((struct ppc_inst *)dest, ppc_inst(instr[0]));
469 patch_instruction((struct ppc_inst *)(dest + 1), ppc_inst(instr[1]));
472 printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i);
475 static void patch_btb_flush_section(long *curr)
477 unsigned int *start, *end;
479 start = (void *)curr + *curr;
480 end = (void *)curr + *(curr + 1);
481 for (; start < end; start++) {
482 pr_devel("patching dest %lx\n", (unsigned long)start);
483 patch_instruction((struct ppc_inst *)start, ppc_inst(PPC_INST_NOP));
487 void do_btb_flush_fixups(void)
491 start = PTRRELOC(&__start__btb_flush_fixup);
492 end = PTRRELOC(&__stop__btb_flush_fixup);
494 for (; start < end; start += 2)
495 patch_btb_flush_section(start);
497 #endif /* CONFIG_PPC_FSL_BOOK3E */
499 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
502 struct ppc_inst *dest;
504 if (!(value & CPU_FTR_LWSYNC))
510 for (; start < end; start++) {
511 dest = (void *)start + *start;
512 raw_patch_instruction(dest, ppc_inst(PPC_INST_LWSYNC));
516 static void do_final_fixups(void)
518 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
519 struct ppc_inst inst, *src, *dest, *end;
521 if (PHYSICAL_START == 0)
524 src = (struct ppc_inst *)(KERNELBASE + PHYSICAL_START);
525 dest = (struct ppc_inst *)KERNELBASE;
526 end = (void *)src + (__end_interrupts - _stext);
529 inst = ppc_inst_read(src);
530 raw_patch_instruction(dest, inst);
531 src = ppc_inst_next(src, src);
532 dest = ppc_inst_next(dest, dest);
537 static unsigned long __initdata saved_cpu_features;
538 static unsigned int __initdata saved_mmu_features;
540 static unsigned long __initdata saved_firmware_features;
543 void __init apply_feature_fixups(void)
545 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec));
547 *PTRRELOC(&saved_cpu_features) = spec->cpu_features;
548 *PTRRELOC(&saved_mmu_features) = spec->mmu_features;
551 * Apply the CPU-specific and firmware specific fixups to kernel text
552 * (nop out sections not relevant to this CPU or this firmware).
554 do_feature_fixups(spec->cpu_features,
555 PTRRELOC(&__start___ftr_fixup),
556 PTRRELOC(&__stop___ftr_fixup));
558 do_feature_fixups(spec->mmu_features,
559 PTRRELOC(&__start___mmu_ftr_fixup),
560 PTRRELOC(&__stop___mmu_ftr_fixup));
562 do_lwsync_fixups(spec->cpu_features,
563 PTRRELOC(&__start___lwsync_fixup),
564 PTRRELOC(&__stop___lwsync_fixup));
567 saved_firmware_features = powerpc_firmware_features;
568 do_feature_fixups(powerpc_firmware_features,
569 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
574 void __init setup_feature_keys(void)
577 * Initialise jump label. This causes all the cpu/mmu_has_feature()
578 * checks to take on their correct polarity based on the current set of
582 cpu_feature_keys_init();
583 mmu_feature_keys_init();
586 static int __init check_features(void)
588 WARN(saved_cpu_features != cur_cpu_spec->cpu_features,
589 "CPU features changed after feature patching!\n");
590 WARN(saved_mmu_features != cur_cpu_spec->mmu_features,
591 "MMU features changed after feature patching!\n");
593 WARN(saved_firmware_features != powerpc_firmware_features,
594 "Firmware features changed after feature patching!\n");
599 late_initcall(check_features);
601 #ifdef CONFIG_FTR_FIXUP_SELFTEST
604 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__);
606 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */
607 static struct fixup_entry fixup;
609 static long calc_offset(struct fixup_entry *entry, unsigned int *p)
611 return (unsigned long)p - (unsigned long)entry;
614 static void test_basic_patching(void)
616 extern unsigned int ftr_fixup_test1[];
617 extern unsigned int end_ftr_fixup_test1[];
618 extern unsigned int ftr_fixup_test1_orig[];
619 extern unsigned int ftr_fixup_test1_expected[];
620 int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1);
622 fixup.value = fixup.mask = 8;
623 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1);
624 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2);
625 fixup.alt_start_off = fixup.alt_end_off = 0;
628 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
630 /* Check we don't patch if the value matches */
631 patch_feature_section(8, &fixup);
632 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
634 /* Check we do patch if the value doesn't match */
635 patch_feature_section(0, &fixup);
636 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
638 /* Check we do patch if the mask doesn't match */
639 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size);
640 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0);
641 patch_feature_section(~8, &fixup);
642 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0);
645 static void test_alternative_patching(void)
647 extern unsigned int ftr_fixup_test2[];
648 extern unsigned int end_ftr_fixup_test2[];
649 extern unsigned int ftr_fixup_test2_orig[];
650 extern unsigned int ftr_fixup_test2_alt[];
651 extern unsigned int ftr_fixup_test2_expected[];
652 int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2);
654 fixup.value = fixup.mask = 0xF;
655 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1);
656 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2);
657 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt);
658 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1);
661 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
663 /* Check we don't patch if the value matches */
664 patch_feature_section(0xF, &fixup);
665 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
667 /* Check we do patch if the value doesn't match */
668 patch_feature_section(0, &fixup);
669 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
671 /* Check we do patch if the mask doesn't match */
672 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size);
673 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0);
674 patch_feature_section(~0xF, &fixup);
675 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0);
678 static void test_alternative_case_too_big(void)
680 extern unsigned int ftr_fixup_test3[];
681 extern unsigned int end_ftr_fixup_test3[];
682 extern unsigned int ftr_fixup_test3_orig[];
683 extern unsigned int ftr_fixup_test3_alt[];
684 int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3);
686 fixup.value = fixup.mask = 0xC;
687 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1);
688 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2);
689 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt);
690 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2);
693 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
695 /* Expect nothing to be patched, and the error returned to us */
696 check(patch_feature_section(0xF, &fixup) == 1);
697 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
698 check(patch_feature_section(0, &fixup) == 1);
699 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
700 check(patch_feature_section(~0xF, &fixup) == 1);
701 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0);
704 static void test_alternative_case_too_small(void)
706 extern unsigned int ftr_fixup_test4[];
707 extern unsigned int end_ftr_fixup_test4[];
708 extern unsigned int ftr_fixup_test4_orig[];
709 extern unsigned int ftr_fixup_test4_alt[];
710 extern unsigned int ftr_fixup_test4_expected[];
711 int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4);
714 /* Check a high-bit flag */
715 flag = 1UL << ((sizeof(unsigned long) - 1) * 8);
716 fixup.value = fixup.mask = flag;
717 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1);
718 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5);
719 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt);
720 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2);
723 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
725 /* Check we don't patch if the value matches */
726 patch_feature_section(flag, &fixup);
727 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
729 /* Check we do patch if the value doesn't match */
730 patch_feature_section(0, &fixup);
731 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
733 /* Check we do patch if the mask doesn't match */
734 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size);
735 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0);
736 patch_feature_section(~flag, &fixup);
737 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0);
740 static void test_alternative_case_with_branch(void)
742 extern unsigned int ftr_fixup_test5[];
743 extern unsigned int end_ftr_fixup_test5[];
744 extern unsigned int ftr_fixup_test5_expected[];
745 int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5);
747 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0);
750 static void test_alternative_case_with_external_branch(void)
752 extern unsigned int ftr_fixup_test6[];
753 extern unsigned int end_ftr_fixup_test6[];
754 extern unsigned int ftr_fixup_test6_expected[];
755 int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6);
757 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0);
760 static void test_alternative_case_with_branch_to_end(void)
762 extern unsigned int ftr_fixup_test7[];
763 extern unsigned int end_ftr_fixup_test7[];
764 extern unsigned int ftr_fixup_test7_expected[];
765 int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7);
767 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0);
770 static void test_cpu_macros(void)
772 extern u8 ftr_fixup_test_FTR_macros[];
773 extern u8 ftr_fixup_test_FTR_macros_expected[];
774 unsigned long size = ftr_fixup_test_FTR_macros_expected -
775 ftr_fixup_test_FTR_macros;
777 /* The fixups have already been done for us during boot */
778 check(memcmp(ftr_fixup_test_FTR_macros,
779 ftr_fixup_test_FTR_macros_expected, size) == 0);
782 static void test_fw_macros(void)
785 extern u8 ftr_fixup_test_FW_FTR_macros[];
786 extern u8 ftr_fixup_test_FW_FTR_macros_expected[];
787 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected -
788 ftr_fixup_test_FW_FTR_macros;
790 /* The fixups have already been done for us during boot */
791 check(memcmp(ftr_fixup_test_FW_FTR_macros,
792 ftr_fixup_test_FW_FTR_macros_expected, size) == 0);
796 static void test_lwsync_macros(void)
798 extern u8 lwsync_fixup_test[];
799 extern u8 end_lwsync_fixup_test[];
800 extern u8 lwsync_fixup_test_expected_LWSYNC[];
801 extern u8 lwsync_fixup_test_expected_SYNC[];
802 unsigned long size = end_lwsync_fixup_test -
805 /* The fixups have already been done for us during boot */
806 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) {
807 check(memcmp(lwsync_fixup_test,
808 lwsync_fixup_test_expected_LWSYNC, size) == 0);
810 check(memcmp(lwsync_fixup_test,
811 lwsync_fixup_test_expected_SYNC, size) == 0);
816 static void __init test_prefix_patching(void)
818 extern unsigned int ftr_fixup_prefix1[];
819 extern unsigned int end_ftr_fixup_prefix1[];
820 extern unsigned int ftr_fixup_prefix1_orig[];
821 extern unsigned int ftr_fixup_prefix1_expected[];
822 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix1 - ftr_fixup_prefix1);
824 fixup.value = fixup.mask = 8;
825 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix1 + 1);
826 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix1 + 3);
827 fixup.alt_start_off = fixup.alt_end_off = 0;
830 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) == 0);
832 patch_feature_section(0, &fixup);
833 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_expected, size) == 0);
834 check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) != 0);
837 static void __init test_prefix_alt_patching(void)
839 extern unsigned int ftr_fixup_prefix2[];
840 extern unsigned int end_ftr_fixup_prefix2[];
841 extern unsigned int ftr_fixup_prefix2_orig[];
842 extern unsigned int ftr_fixup_prefix2_expected[];
843 extern unsigned int ftr_fixup_prefix2_alt[];
844 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix2 - ftr_fixup_prefix2);
846 fixup.value = fixup.mask = 8;
847 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix2 + 1);
848 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix2 + 3);
849 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix2_alt);
850 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix2_alt + 2);
852 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) == 0);
854 patch_feature_section(0, &fixup);
855 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_expected, size) == 0);
856 check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) != 0);
859 static void __init test_prefix_word_alt_patching(void)
861 extern unsigned int ftr_fixup_prefix3[];
862 extern unsigned int end_ftr_fixup_prefix3[];
863 extern unsigned int ftr_fixup_prefix3_orig[];
864 extern unsigned int ftr_fixup_prefix3_expected[];
865 extern unsigned int ftr_fixup_prefix3_alt[];
866 int size = sizeof(unsigned int) * (end_ftr_fixup_prefix3 - ftr_fixup_prefix3);
868 fixup.value = fixup.mask = 8;
869 fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix3 + 1);
870 fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix3 + 4);
871 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix3_alt);
872 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix3_alt + 3);
874 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) == 0);
876 patch_feature_section(0, &fixup);
877 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_expected, size) == 0);
878 patch_feature_section(0, &fixup);
879 check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) != 0);
882 static inline void test_prefix_patching(void) {}
883 static inline void test_prefix_alt_patching(void) {}
884 static inline void test_prefix_word_alt_patching(void) {}
885 #endif /* CONFIG_PPC64 */
887 static int __init test_feature_fixups(void)
889 printk(KERN_DEBUG "Running feature fixup self-tests ...\n");
891 test_basic_patching();
892 test_alternative_patching();
893 test_alternative_case_too_big();
894 test_alternative_case_too_small();
895 test_alternative_case_with_branch();
896 test_alternative_case_with_external_branch();
897 test_alternative_case_with_branch_to_end();
900 test_lwsync_macros();
901 test_prefix_patching();
902 test_prefix_alt_patching();
903 test_prefix_word_alt_patching();
907 late_initcall(test_feature_fixups);
909 #endif /* CONFIG_FTR_FIXUP_SELFTEST */