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 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 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 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 } 99 100 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_64 121 static 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 } 170 171 static 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 } 227 228 229 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 } 234 235 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 } 280 281 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 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 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 } 350 351 static void patch_btb_flush_section(long *curr) 352 { 353 unsigned int *start, *end; 354 355 start = (void *)curr + *curr; 356 end = (void *)curr + *(curr + 1); 357 for (; start < end; start++) { 358 pr_devel("patching dest %lx\n", (unsigned long)start); 359 patch_instruction(start, PPC_INST_NOP); 360 } 361 } 362 363 void do_btb_flush_fixups(void) 364 { 365 long *start, *end; 366 367 start = PTRRELOC(&__start__btb_flush_fixup); 368 end = PTRRELOC(&__stop__btb_flush_fixup); 369 370 for (; start < end; start += 2) 371 patch_btb_flush_section(start); 372 } 373 #endif /* CONFIG_PPC_FSL_BOOK3E */ 374 375 void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end) 376 { 377 long *start, *end; 378 unsigned int *dest; 379 380 if (!(value & CPU_FTR_LWSYNC)) 381 return ; 382 383 start = fixup_start; 384 end = fixup_end; 385 386 for (; start < end; start++) { 387 dest = (void *)start + *start; 388 raw_patch_instruction(dest, PPC_INST_LWSYNC); 389 } 390 } 391 392 static void do_final_fixups(void) 393 { 394 #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE) 395 int *src, *dest; 396 unsigned long length; 397 398 if (PHYSICAL_START == 0) 399 return; 400 401 src = (int *)(KERNELBASE + PHYSICAL_START); 402 dest = (int *)KERNELBASE; 403 length = (__end_interrupts - _stext) / sizeof(int); 404 405 while (length--) { 406 raw_patch_instruction(dest, *src); 407 src++; 408 dest++; 409 } 410 #endif 411 } 412 413 static unsigned long __initdata saved_cpu_features; 414 static unsigned int __initdata saved_mmu_features; 415 #ifdef CONFIG_PPC64 416 static unsigned long __initdata saved_firmware_features; 417 #endif 418 419 void __init apply_feature_fixups(void) 420 { 421 struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec)); 422 423 *PTRRELOC(&saved_cpu_features) = spec->cpu_features; 424 *PTRRELOC(&saved_mmu_features) = spec->mmu_features; 425 426 /* 427 * Apply the CPU-specific and firmware specific fixups to kernel text 428 * (nop out sections not relevant to this CPU or this firmware). 429 */ 430 do_feature_fixups(spec->cpu_features, 431 PTRRELOC(&__start___ftr_fixup), 432 PTRRELOC(&__stop___ftr_fixup)); 433 434 do_feature_fixups(spec->mmu_features, 435 PTRRELOC(&__start___mmu_ftr_fixup), 436 PTRRELOC(&__stop___mmu_ftr_fixup)); 437 438 do_lwsync_fixups(spec->cpu_features, 439 PTRRELOC(&__start___lwsync_fixup), 440 PTRRELOC(&__stop___lwsync_fixup)); 441 442 #ifdef CONFIG_PPC64 443 saved_firmware_features = powerpc_firmware_features; 444 do_feature_fixups(powerpc_firmware_features, 445 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); 446 #endif 447 do_final_fixups(); 448 } 449 450 void __init setup_feature_keys(void) 451 { 452 /* 453 * Initialise jump label. This causes all the cpu/mmu_has_feature() 454 * checks to take on their correct polarity based on the current set of 455 * CPU/MMU features. 456 */ 457 jump_label_init(); 458 cpu_feature_keys_init(); 459 mmu_feature_keys_init(); 460 } 461 462 static int __init check_features(void) 463 { 464 WARN(saved_cpu_features != cur_cpu_spec->cpu_features, 465 "CPU features changed after feature patching!\n"); 466 WARN(saved_mmu_features != cur_cpu_spec->mmu_features, 467 "MMU features changed after feature patching!\n"); 468 #ifdef CONFIG_PPC64 469 WARN(saved_firmware_features != powerpc_firmware_features, 470 "Firmware features changed after feature patching!\n"); 471 #endif 472 473 return 0; 474 } 475 late_initcall(check_features); 476 477 #ifdef CONFIG_FTR_FIXUP_SELFTEST 478 479 #define check(x) \ 480 if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__); 481 482 /* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */ 483 static struct fixup_entry fixup; 484 485 static long calc_offset(struct fixup_entry *entry, unsigned int *p) 486 { 487 return (unsigned long)p - (unsigned long)entry; 488 } 489 490 static void test_basic_patching(void) 491 { 492 extern unsigned int ftr_fixup_test1[]; 493 extern unsigned int end_ftr_fixup_test1[]; 494 extern unsigned int ftr_fixup_test1_orig[]; 495 extern unsigned int ftr_fixup_test1_expected[]; 496 int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1); 497 498 fixup.value = fixup.mask = 8; 499 fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1); 500 fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2); 501 fixup.alt_start_off = fixup.alt_end_off = 0; 502 503 /* Sanity check */ 504 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 505 506 /* Check we don't patch if the value matches */ 507 patch_feature_section(8, &fixup); 508 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 509 510 /* Check we do patch if the value doesn't match */ 511 patch_feature_section(0, &fixup); 512 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0); 513 514 /* Check we do patch if the mask doesn't match */ 515 memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size); 516 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); 517 patch_feature_section(~8, &fixup); 518 check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0); 519 } 520 521 static void test_alternative_patching(void) 522 { 523 extern unsigned int ftr_fixup_test2[]; 524 extern unsigned int end_ftr_fixup_test2[]; 525 extern unsigned int ftr_fixup_test2_orig[]; 526 extern unsigned int ftr_fixup_test2_alt[]; 527 extern unsigned int ftr_fixup_test2_expected[]; 528 int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2); 529 530 fixup.value = fixup.mask = 0xF; 531 fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1); 532 fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2); 533 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt); 534 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1); 535 536 /* Sanity check */ 537 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 538 539 /* Check we don't patch if the value matches */ 540 patch_feature_section(0xF, &fixup); 541 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 542 543 /* Check we do patch if the value doesn't match */ 544 patch_feature_section(0, &fixup); 545 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0); 546 547 /* Check we do patch if the mask doesn't match */ 548 memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size); 549 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); 550 patch_feature_section(~0xF, &fixup); 551 check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0); 552 } 553 554 static void test_alternative_case_too_big(void) 555 { 556 extern unsigned int ftr_fixup_test3[]; 557 extern unsigned int end_ftr_fixup_test3[]; 558 extern unsigned int ftr_fixup_test3_orig[]; 559 extern unsigned int ftr_fixup_test3_alt[]; 560 int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3); 561 562 fixup.value = fixup.mask = 0xC; 563 fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1); 564 fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2); 565 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt); 566 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2); 567 568 /* Sanity check */ 569 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 570 571 /* Expect nothing to be patched, and the error returned to us */ 572 check(patch_feature_section(0xF, &fixup) == 1); 573 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 574 check(patch_feature_section(0, &fixup) == 1); 575 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 576 check(patch_feature_section(~0xF, &fixup) == 1); 577 check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); 578 } 579 580 static void test_alternative_case_too_small(void) 581 { 582 extern unsigned int ftr_fixup_test4[]; 583 extern unsigned int end_ftr_fixup_test4[]; 584 extern unsigned int ftr_fixup_test4_orig[]; 585 extern unsigned int ftr_fixup_test4_alt[]; 586 extern unsigned int ftr_fixup_test4_expected[]; 587 int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4); 588 unsigned long flag; 589 590 /* Check a high-bit flag */ 591 flag = 1UL << ((sizeof(unsigned long) - 1) * 8); 592 fixup.value = fixup.mask = flag; 593 fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1); 594 fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5); 595 fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt); 596 fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2); 597 598 /* Sanity check */ 599 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 600 601 /* Check we don't patch if the value matches */ 602 patch_feature_section(flag, &fixup); 603 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 604 605 /* Check we do patch if the value doesn't match */ 606 patch_feature_section(0, &fixup); 607 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0); 608 609 /* Check we do patch if the mask doesn't match */ 610 memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size); 611 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); 612 patch_feature_section(~flag, &fixup); 613 check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0); 614 } 615 616 static void test_alternative_case_with_branch(void) 617 { 618 extern unsigned int ftr_fixup_test5[]; 619 extern unsigned int end_ftr_fixup_test5[]; 620 extern unsigned int ftr_fixup_test5_expected[]; 621 int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5); 622 623 check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0); 624 } 625 626 static void test_alternative_case_with_external_branch(void) 627 { 628 extern unsigned int ftr_fixup_test6[]; 629 extern unsigned int end_ftr_fixup_test6[]; 630 extern unsigned int ftr_fixup_test6_expected[]; 631 int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6); 632 633 check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0); 634 } 635 636 static void test_alternative_case_with_branch_to_end(void) 637 { 638 extern unsigned int ftr_fixup_test7[]; 639 extern unsigned int end_ftr_fixup_test7[]; 640 extern unsigned int ftr_fixup_test7_expected[]; 641 int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7); 642 643 check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0); 644 } 645 646 static void test_cpu_macros(void) 647 { 648 extern u8 ftr_fixup_test_FTR_macros[]; 649 extern u8 ftr_fixup_test_FTR_macros_expected[]; 650 unsigned long size = ftr_fixup_test_FTR_macros_expected - 651 ftr_fixup_test_FTR_macros; 652 653 /* The fixups have already been done for us during boot */ 654 check(memcmp(ftr_fixup_test_FTR_macros, 655 ftr_fixup_test_FTR_macros_expected, size) == 0); 656 } 657 658 static void test_fw_macros(void) 659 { 660 #ifdef CONFIG_PPC64 661 extern u8 ftr_fixup_test_FW_FTR_macros[]; 662 extern u8 ftr_fixup_test_FW_FTR_macros_expected[]; 663 unsigned long size = ftr_fixup_test_FW_FTR_macros_expected - 664 ftr_fixup_test_FW_FTR_macros; 665 666 /* The fixups have already been done for us during boot */ 667 check(memcmp(ftr_fixup_test_FW_FTR_macros, 668 ftr_fixup_test_FW_FTR_macros_expected, size) == 0); 669 #endif 670 } 671 672 static void test_lwsync_macros(void) 673 { 674 extern u8 lwsync_fixup_test[]; 675 extern u8 end_lwsync_fixup_test[]; 676 extern u8 lwsync_fixup_test_expected_LWSYNC[]; 677 extern u8 lwsync_fixup_test_expected_SYNC[]; 678 unsigned long size = end_lwsync_fixup_test - 679 lwsync_fixup_test; 680 681 /* The fixups have already been done for us during boot */ 682 if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) { 683 check(memcmp(lwsync_fixup_test, 684 lwsync_fixup_test_expected_LWSYNC, size) == 0); 685 } else { 686 check(memcmp(lwsync_fixup_test, 687 lwsync_fixup_test_expected_SYNC, size) == 0); 688 } 689 } 690 691 static int __init test_feature_fixups(void) 692 { 693 printk(KERN_DEBUG "Running feature fixup self-tests ...\n"); 694 695 test_basic_patching(); 696 test_alternative_patching(); 697 test_alternative_case_too_big(); 698 test_alternative_case_too_small(); 699 test_alternative_case_with_branch(); 700 test_alternative_case_with_external_branch(); 701 test_alternative_case_with_branch_to_end(); 702 test_cpu_macros(); 703 test_fw_macros(); 704 test_lwsync_macros(); 705 706 return 0; 707 } 708 late_initcall(test_feature_fixups); 709 710 #endif /* CONFIG_FTR_FIXUP_SELFTEST */ 711