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-rw-r--r--arch/arm/mm/fault.c111
1 files changed, 19 insertions, 92 deletions
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index aa33949fef60..eb5520fc755f 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -27,19 +27,6 @@
27 27
28#include "fault.h" 28#include "fault.h"
29 29
30/*
31 * Fault status register encodings. We steal bit 31 for our own purposes.
32 */
33#define FSR_LNX_PF (1 << 31)
34#define FSR_WRITE (1 << 11)
35#define FSR_FS4 (1 << 10)
36#define FSR_FS3_0 (15)
37
38static inline int fsr_fs(unsigned int fsr)
39{
40 return (fsr & FSR_FS3_0) | (fsr & FSR_FS4) >> 6;
41}
42
43#ifdef CONFIG_MMU 30#ifdef CONFIG_MMU
44 31
45#ifdef CONFIG_KPROBES 32#ifdef CONFIG_KPROBES
@@ -123,8 +110,10 @@ void show_pte(struct mm_struct *mm, unsigned long addr)
123 110
124 pte = pte_offset_map(pmd, addr); 111 pte = pte_offset_map(pmd, addr);
125 printk(", *pte=%08llx", (long long)pte_val(*pte)); 112 printk(", *pte=%08llx", (long long)pte_val(*pte));
113#ifndef CONFIG_ARM_LPAE
126 printk(", *ppte=%08llx", 114 printk(", *ppte=%08llx",
127 (long long)pte_val(pte[PTE_HWTABLE_PTRS])); 115 (long long)pte_val(pte[PTE_HWTABLE_PTRS]));
116#endif
128 pte_unmap(pte); 117 pte_unmap(pte);
129 } while(0); 118 } while(0);
130 119
@@ -441,6 +430,12 @@ do_translation_fault(unsigned long addr, unsigned int fsr,
441 pmd = pmd_offset(pud, addr); 430 pmd = pmd_offset(pud, addr);
442 pmd_k = pmd_offset(pud_k, addr); 431 pmd_k = pmd_offset(pud_k, addr);
443 432
433#ifdef CONFIG_ARM_LPAE
434 /*
435 * Only one hardware entry per PMD with LPAE.
436 */
437 index = 0;
438#else
444 /* 439 /*
445 * On ARM one Linux PGD entry contains two hardware entries (see page 440 * On ARM one Linux PGD entry contains two hardware entries (see page
446 * tables layout in pgtable.h). We normally guarantee that we always 441 * tables layout in pgtable.h). We normally guarantee that we always
@@ -450,6 +445,7 @@ do_translation_fault(unsigned long addr, unsigned int fsr,
450 * for the first of pair. 445 * for the first of pair.
451 */ 446 */
452 index = (addr >> SECTION_SHIFT) & 1; 447 index = (addr >> SECTION_SHIFT) & 1;
448#endif
453 if (pmd_none(pmd_k[index])) 449 if (pmd_none(pmd_k[index]))
454 goto bad_area; 450 goto bad_area;
455 451
@@ -489,55 +485,20 @@ do_bad(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
489 return 1; 485 return 1;
490} 486}
491 487
492static struct fsr_info { 488struct fsr_info {
493 int (*fn)(unsigned long addr, unsigned int fsr, struct pt_regs *regs); 489 int (*fn)(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
494 int sig; 490 int sig;
495 int code; 491 int code;
496 const char *name; 492 const char *name;
497} fsr_info[] = {
498 /*
499 * The following are the standard ARMv3 and ARMv4 aborts. ARMv5
500 * defines these to be "precise" aborts.
501 */
502 { do_bad, SIGSEGV, 0, "vector exception" },
503 { do_bad, SIGBUS, BUS_ADRALN, "alignment exception" },
504 { do_bad, SIGKILL, 0, "terminal exception" },
505 { do_bad, SIGBUS, BUS_ADRALN, "alignment exception" },
506 { do_bad, SIGBUS, 0, "external abort on linefetch" },
507 { do_translation_fault, SIGSEGV, SEGV_MAPERR, "section translation fault" },
508 { do_bad, SIGBUS, 0, "external abort on linefetch" },
509 { do_page_fault, SIGSEGV, SEGV_MAPERR, "page translation fault" },
510 { do_bad, SIGBUS, 0, "external abort on non-linefetch" },
511 { do_bad, SIGSEGV, SEGV_ACCERR, "section domain fault" },
512 { do_bad, SIGBUS, 0, "external abort on non-linefetch" },
513 { do_bad, SIGSEGV, SEGV_ACCERR, "page domain fault" },
514 { do_bad, SIGBUS, 0, "external abort on translation" },
515 { do_sect_fault, SIGSEGV, SEGV_ACCERR, "section permission fault" },
516 { do_bad, SIGBUS, 0, "external abort on translation" },
517 { do_page_fault, SIGSEGV, SEGV_ACCERR, "page permission fault" },
518 /*
519 * The following are "imprecise" aborts, which are signalled by bit
520 * 10 of the FSR, and may not be recoverable. These are only
521 * supported if the CPU abort handler supports bit 10.
522 */
523 { do_bad, SIGBUS, 0, "unknown 16" },
524 { do_bad, SIGBUS, 0, "unknown 17" },
525 { do_bad, SIGBUS, 0, "unknown 18" },
526 { do_bad, SIGBUS, 0, "unknown 19" },
527 { do_bad, SIGBUS, 0, "lock abort" }, /* xscale */
528 { do_bad, SIGBUS, 0, "unknown 21" },
529 { do_bad, SIGBUS, BUS_OBJERR, "imprecise external abort" }, /* xscale */
530 { do_bad, SIGBUS, 0, "unknown 23" },
531 { do_bad, SIGBUS, 0, "dcache parity error" }, /* xscale */
532 { do_bad, SIGBUS, 0, "unknown 25" },
533 { do_bad, SIGBUS, 0, "unknown 26" },
534 { do_bad, SIGBUS, 0, "unknown 27" },
535 { do_bad, SIGBUS, 0, "unknown 28" },
536 { do_bad, SIGBUS, 0, "unknown 29" },
537 { do_bad, SIGBUS, 0, "unknown 30" },
538 { do_bad, SIGBUS, 0, "unknown 31" }
539}; 493};
540 494
495/* FSR definition */
496#ifdef CONFIG_ARM_LPAE
497#include "fsr-3level.c"
498#else
499#include "fsr-2level.c"
500#endif
501
541void __init 502void __init
542hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), 503hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
543 int sig, int code, const char *name) 504 int sig, int code, const char *name)
@@ -573,42 +534,6 @@ do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
573 arm_notify_die("", regs, &info, fsr, 0); 534 arm_notify_die("", regs, &info, fsr, 0);
574} 535}
575 536
576
577static struct fsr_info ifsr_info[] = {
578 { do_bad, SIGBUS, 0, "unknown 0" },
579 { do_bad, SIGBUS, 0, "unknown 1" },
580 { do_bad, SIGBUS, 0, "debug event" },
581 { do_bad, SIGSEGV, SEGV_ACCERR, "section access flag fault" },
582 { do_bad, SIGBUS, 0, "unknown 4" },
583 { do_translation_fault, SIGSEGV, SEGV_MAPERR, "section translation fault" },
584 { do_bad, SIGSEGV, SEGV_ACCERR, "page access flag fault" },
585 { do_page_fault, SIGSEGV, SEGV_MAPERR, "page translation fault" },
586 { do_bad, SIGBUS, 0, "external abort on non-linefetch" },
587 { do_bad, SIGSEGV, SEGV_ACCERR, "section domain fault" },
588 { do_bad, SIGBUS, 0, "unknown 10" },
589 { do_bad, SIGSEGV, SEGV_ACCERR, "page domain fault" },
590 { do_bad, SIGBUS, 0, "external abort on translation" },
591 { do_sect_fault, SIGSEGV, SEGV_ACCERR, "section permission fault" },
592 { do_bad, SIGBUS, 0, "external abort on translation" },
593 { do_page_fault, SIGSEGV, SEGV_ACCERR, "page permission fault" },
594 { do_bad, SIGBUS, 0, "unknown 16" },
595 { do_bad, SIGBUS, 0, "unknown 17" },
596 { do_bad, SIGBUS, 0, "unknown 18" },
597 { do_bad, SIGBUS, 0, "unknown 19" },
598 { do_bad, SIGBUS, 0, "unknown 20" },
599 { do_bad, SIGBUS, 0, "unknown 21" },
600 { do_bad, SIGBUS, 0, "unknown 22" },
601 { do_bad, SIGBUS, 0, "unknown 23" },
602 { do_bad, SIGBUS, 0, "unknown 24" },
603 { do_bad, SIGBUS, 0, "unknown 25" },
604 { do_bad, SIGBUS, 0, "unknown 26" },
605 { do_bad, SIGBUS, 0, "unknown 27" },
606 { do_bad, SIGBUS, 0, "unknown 28" },
607 { do_bad, SIGBUS, 0, "unknown 29" },
608 { do_bad, SIGBUS, 0, "unknown 30" },
609 { do_bad, SIGBUS, 0, "unknown 31" },
610};
611
612void __init 537void __init
613hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), 538hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
614 int sig, int code, const char *name) 539 int sig, int code, const char *name)
@@ -641,6 +566,7 @@ do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
641 arm_notify_die("", regs, &info, ifsr, 0); 566 arm_notify_die("", regs, &info, ifsr, 0);
642} 567}
643 568
569#ifndef CONFIG_ARM_LPAE
644static int __init exceptions_init(void) 570static int __init exceptions_init(void)
645{ 571{
646 if (cpu_architecture() >= CPU_ARCH_ARMv6) { 572 if (cpu_architecture() >= CPU_ARCH_ARMv6) {
@@ -663,3 +589,4 @@ static int __init exceptions_init(void)
663} 589}
664 590
665arch_initcall(exceptions_init); 591arch_initcall(exceptions_init);
592#endif
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-06 11:19:28 -0500