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arch/arm/mm/fault.c
13.9 KB
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/* * linux/arch/arm/mm/fault.c * * Copyright (C) 1995 Linus Torvalds * Modifications for ARM processor (c) 1995-2004 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ |
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#include <linux/module.h> #include <linux/signal.h> |
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#include <linux/mm.h> |
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#include <linux/hardirq.h> |
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#include <linux/init.h> |
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#include <linux/kprobes.h> |
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#include <linux/uaccess.h> |
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#include <linux/page-flags.h> |
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#include <linux/sched.h> |
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#include <linux/highmem.h> |
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#include <linux/perf_event.h> |
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|
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#include <asm/exception.h> |
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#include <asm/system.h> #include <asm/pgtable.h> #include <asm/tlbflush.h> |
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#include "fault.h" |
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#ifdef CONFIG_MMU |
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#ifdef CONFIG_KPROBES static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr) { int ret = 0; if (!user_mode(regs)) { /* kprobe_running() needs smp_processor_id() */ preempt_disable(); if (kprobe_running() && kprobe_fault_handler(regs, fsr)) ret = 1; preempt_enable(); } return ret; } #else static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr) { return 0; } #endif |
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/* * This is useful to dump out the page tables associated with * 'addr' in mm 'mm'. */ void show_pte(struct mm_struct *mm, unsigned long addr) { pgd_t *pgd; if (!mm) mm = &init_mm; printk(KERN_ALERT "pgd = %p ", mm->pgd); pgd = pgd_offset(mm, addr); |
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printk(KERN_ALERT "[%08lx] *pgd=%08llx", addr, (long long)pgd_val(*pgd)); |
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do { |
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pud_t *pud; |
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pmd_t *pmd; pte_t *pte; if (pgd_none(*pgd)) break; if (pgd_bad(*pgd)) { printk("(bad)"); break; } |
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pud = pud_offset(pgd, addr); if (PTRS_PER_PUD != 1) |
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printk(", *pud=%08llx", (long long)pud_val(*pud)); |
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if (pud_none(*pud)) break; if (pud_bad(*pud)) { printk("(bad)"); break; } pmd = pmd_offset(pud, addr); |
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if (PTRS_PER_PMD != 1) |
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printk(", *pmd=%08llx", (long long)pmd_val(*pmd)); |
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if (pmd_none(*pmd)) break; if (pmd_bad(*pmd)) { printk("(bad)"); break; } |
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/* We must not map this if we have highmem enabled */ |
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if (PageHighMem(pfn_to_page(pmd_val(*pmd) >> PAGE_SHIFT))) break; |
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pte = pte_offset_map(pmd, addr); |
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printk(", *pte=%08llx", (long long)pte_val(*pte)); |
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#ifndef CONFIG_ARM_LPAE |
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printk(", *ppte=%08llx", (long long)pte_val(pte[PTE_HWTABLE_PTRS])); |
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#endif |
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pte_unmap(pte); |
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} while(0); printk(" "); } |
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#else /* CONFIG_MMU */ void show_pte(struct mm_struct *mm, unsigned long addr) { } #endif /* CONFIG_MMU */ |
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/* * Oops. The kernel tried to access some page that wasn't present. */ static void __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, struct pt_regs *regs) { /* * Are we prepared to handle this kernel fault? */ if (fixup_exception(regs)) return; /* * No handler, we'll have to terminate things with extreme prejudice. */ bust_spinlocks(1); printk(KERN_ALERT "Unable to handle kernel %s at virtual address %08lx ", (addr < PAGE_SIZE) ? "NULL pointer dereference" : "paging request", addr); show_pte(mm, addr); die("Oops", regs, fsr); bust_spinlocks(0); do_exit(SIGKILL); } /* * Something tried to access memory that isn't in our memory map.. * User mode accesses just cause a SIGSEGV */ static void __do_user_fault(struct task_struct *tsk, unsigned long addr, |
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unsigned int fsr, unsigned int sig, int code, struct pt_regs *regs) |
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{ struct siginfo si; #ifdef CONFIG_DEBUG_USER if (user_debug & UDBG_SEGV) { |
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printk(KERN_DEBUG "%s: unhandled page fault (%d) at 0x%08lx, code 0x%03x ", tsk->comm, sig, addr, fsr); |
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show_pte(tsk->mm, addr); show_regs(regs); } #endif tsk->thread.address = addr; tsk->thread.error_code = fsr; tsk->thread.trap_no = 14; |
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si.si_signo = sig; |
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si.si_errno = 0; si.si_code = code; si.si_addr = (void __user *)addr; |
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force_sig_info(sig, &si, tsk); |
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} |
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void do_bad_area(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
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{ |
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struct task_struct *tsk = current; struct mm_struct *mm = tsk->active_mm; |
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/* * If we are in kernel mode at this point, we * have no context to handle this fault with. */ if (user_mode(regs)) |
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__do_user_fault(tsk, addr, fsr, SIGSEGV, SEGV_MAPERR, regs); |
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else __do_kernel_fault(mm, addr, fsr, regs); } |
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#ifdef CONFIG_MMU |
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#define VM_FAULT_BADMAP 0x010000 #define VM_FAULT_BADACCESS 0x020000 |
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|
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/* * Check that the permissions on the VMA allow for the fault which occurred. * If we encountered a write fault, we must have write permission, otherwise * we allow any permission. */ static inline bool access_error(unsigned int fsr, struct vm_area_struct *vma) { unsigned int mask = VM_READ | VM_WRITE | VM_EXEC; if (fsr & FSR_WRITE) mask = VM_WRITE; |
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if (fsr & FSR_LNX_PF) mask = VM_EXEC; |
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return vma->vm_flags & mask ? false : true; } static int __kprobes |
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__do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, |
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unsigned int flags, struct task_struct *tsk) |
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{ struct vm_area_struct *vma; |
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int fault; |
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vma = find_vma(mm, addr); fault = VM_FAULT_BADMAP; |
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if (unlikely(!vma)) |
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goto out; |
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if (unlikely(vma->vm_start > addr)) |
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goto check_stack; /* * Ok, we have a good vm_area for this * memory access, so we can handle it. */ good_area: |
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if (access_error(fsr, vma)) { fault = VM_FAULT_BADACCESS; |
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goto out; |
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} |
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|
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return handle_mm_fault(mm, vma, addr & PAGE_MASK, flags); |
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|
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check_stack: if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr)) goto good_area; out: return fault; } |
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static int __kprobes |
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do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { struct task_struct *tsk; struct mm_struct *mm; |
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int fault, sig, code; |
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int write = fsr & FSR_WRITE; unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE | (write ? FAULT_FLAG_WRITE : 0); |
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|
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if (notify_page_fault(regs, fsr)) return 0; |
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tsk = current; mm = tsk->mm; |
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/* Enable interrupts if they were enabled in the parent context. */ if (interrupts_enabled(regs)) local_irq_enable(); |
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/* * If we're in an interrupt or have no user * context, we must not take the fault.. */ |
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if (in_atomic() || !mm) |
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goto no_context; |
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/* * As per x86, we may deadlock here. However, since the kernel only * validly references user space from well defined areas of the code, * we can bug out early if this is from code which shouldn't. */ if (!down_read_trylock(&mm->mmap_sem)) { if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc)) goto no_context; |
8878a539f ARM: 7178/1: faul... |
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retry: |
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down_read(&mm->mmap_sem); |
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} else { /* * The above down_read_trylock() might have succeeded in * which case, we'll have missed the might_sleep() from * down_read() */ might_sleep(); |
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#ifdef CONFIG_DEBUG_VM if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc)) goto no_context; #endif |
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} |
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fault = __do_page_fault(mm, addr, fsr, flags, tsk); /* If we need to retry but a fatal signal is pending, handle the * signal first. We do not need to release the mmap_sem because * it would already be released in __lock_page_or_retry in * mm/filemap.c. */ if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) return 0; /* * Major/minor page fault accounting is only done on the * initial attempt. If we go through a retry, it is extremely * likely that the page will be found in page cache at that point. */ |
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|
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perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr); |
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if (flags & FAULT_FLAG_ALLOW_RETRY) { if (fault & VM_FAULT_MAJOR) { tsk->maj_flt++; perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, regs, addr); } else { tsk->min_flt++; perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, regs, addr); } if (fault & VM_FAULT_RETRY) { /* Clear FAULT_FLAG_ALLOW_RETRY to avoid any risk * of starvation. */ flags &= ~FAULT_FLAG_ALLOW_RETRY; goto retry; } } up_read(&mm->mmap_sem); |
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|
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/* |
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* Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR |
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*/ |
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if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS)))) |
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return 0; |
b42c6344b ARM: Update page ... |
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if (fault & VM_FAULT_OOM) { /* * We ran out of memory, call the OOM killer, and return to * userspace (which will retry the fault, or kill us if we * got oom-killed) */ pagefault_out_of_memory(); return 0; } |
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/* |
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* If we are in kernel mode at this point, we * have no context to handle this fault with. */ if (!user_mode(regs)) goto no_context; |
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if (fault & VM_FAULT_SIGBUS) { |
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/* * We had some memory, but were unable to * successfully fix up this page fault. */ sig = SIGBUS; code = BUS_ADRERR; |
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} else { |
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/* * Something tried to access memory that * isn't in our memory map.. */ sig = SIGSEGV; code = fault == VM_FAULT_BADACCESS ? SEGV_ACCERR : SEGV_MAPERR; |
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} |
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|
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__do_user_fault(tsk, addr, fsr, sig, code, regs); return 0; |
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no_context: __do_kernel_fault(mm, addr, fsr, regs); return 0; } |
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#else /* CONFIG_MMU */ static int do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { return 0; } #endif /* CONFIG_MMU */ |
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/* * First Level Translation Fault Handler * * We enter here because the first level page table doesn't contain * a valid entry for the address. * * If the address is in kernel space (>= TASK_SIZE), then we are * probably faulting in the vmalloc() area. * * If the init_task's first level page tables contains the relevant * entry, we copy the it to this task. If not, we send the process * a signal, fixup the exception, or oops the kernel. * * NOTE! We MUST NOT take any locks for this case. We may be in an * interrupt or a critical region, and should only copy the information * from the master page table, nothing more. */ |
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#ifdef CONFIG_MMU |
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static int __kprobes |
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do_translation_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { |
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unsigned int index; pgd_t *pgd, *pgd_k; |
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pud_t *pud, *pud_k; |
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pmd_t *pmd, *pmd_k; if (addr < TASK_SIZE) return do_page_fault(addr, fsr, regs); |
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if (user_mode(regs)) goto bad_area; |
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index = pgd_index(addr); /* * FIXME: CP15 C1 is write only on ARMv3 architectures. */ pgd = cpu_get_pgd() + index; pgd_k = init_mm.pgd + index; if (pgd_none(*pgd_k)) goto bad_area; |
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if (!pgd_present(*pgd)) set_pgd(pgd, *pgd_k); |
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pud = pud_offset(pgd, addr); pud_k = pud_offset(pgd_k, addr); if (pud_none(*pud_k)) goto bad_area; if (!pud_present(*pud)) set_pud(pud, *pud_k); pmd = pmd_offset(pud, addr); pmd_k = pmd_offset(pud_k, addr); |
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|
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#ifdef CONFIG_ARM_LPAE /* * Only one hardware entry per PMD with LPAE. */ index = 0; #else |
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/* * On ARM one Linux PGD entry contains two hardware entries (see page * tables layout in pgtable.h). We normally guarantee that we always * fill both L1 entries. But create_mapping() doesn't follow the rule. * It can create inidividual L1 entries, so here we have to call * pmd_none() check for the entry really corresponded to address, not * for the first of pair. */ index = (addr >> SECTION_SHIFT) & 1; |
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#endif |
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if (pmd_none(pmd_k[index])) |
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goto bad_area; copy_pmd(pmd, pmd_k); return 0; bad_area: |
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do_bad_area(addr, fsr, regs); |
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return 0; } |
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#else /* CONFIG_MMU */ static int do_translation_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { return 0; } #endif /* CONFIG_MMU */ |
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/* * Some section permission faults need to be handled gracefully. * They can happen due to a __{get,put}_user during an oops. */ static int do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { |
e5beac371 [ARM] do_bad_area... |
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do_bad_area(addr, fsr, regs); |
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return 0; } /* * This abort handler always returns "fault". */ static int do_bad(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { return 1; } |
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struct fsr_info { |
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int (*fn)(unsigned long addr, unsigned int fsr, struct pt_regs *regs); int sig; |
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int code; |
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const char *name; |
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}; |
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/* FSR definition */ |
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#ifdef CONFIG_ARM_LPAE #include "fsr-3level.c" #else |
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#include "fsr-2level.c" |
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#endif |
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|
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void __init hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), |
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int sig, int code, const char *name) |
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{ |
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if (nr < 0 || nr >= ARRAY_SIZE(fsr_info)) BUG(); fsr_info[nr].fn = fn; fsr_info[nr].sig = sig; fsr_info[nr].code = code; fsr_info[nr].name = name; |
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} /* * Dispatch a data abort to the relevant handler. */ |
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asmlinkage void __exception |
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do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { |
c88d6aa71 ARM: Provide defi... |
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const struct fsr_info *inf = fsr_info + fsr_fs(fsr); |
cfb0810ea [PATCH] ARM: Don'... |
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struct siginfo info; |
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|
df297bf6c ARM: Add support ... |
526 |
if (!inf->fn(addr, fsr & ~FSR_LNX_PF, regs)) |
1da177e4c Linux-2.6.12-rc2 |
527 528 529 530 531 |
return; printk(KERN_ALERT "Unhandled fault: %s (0x%03x) at 0x%08lx ", inf->name, fsr, addr); |
cfb0810ea [PATCH] ARM: Don'... |
532 533 534 535 536 |
info.si_signo = inf->sig; info.si_errno = 0; info.si_code = inf->code; info.si_addr = (void __user *)addr; |
1eeb66a1b move die notifier... |
537 |
arm_notify_die("", regs, &info, fsr, 0); |
1da177e4c Linux-2.6.12-rc2 |
538 |
} |
3a4b5dca5 ARM: 6355/1: hw-b... |
539 540 541 542 543 544 545 546 547 548 549 550 |
void __init hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *), int sig, int code, const char *name) { if (nr < 0 || nr >= ARRAY_SIZE(ifsr_info)) BUG(); ifsr_info[nr].fn = fn; ifsr_info[nr].sig = sig; ifsr_info[nr].code = code; ifsr_info[nr].name = name; } |
7ab3f8d59 [ARM] Add ability... |
551 |
asmlinkage void __exception |
4fb284743 ARM: 5727/1: Pass... |
552 |
do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs) |
1da177e4c Linux-2.6.12-rc2 |
553 |
{ |
d25ef8b86 ARM: 5728/1: Prop... |
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 |
const struct fsr_info *inf = ifsr_info + fsr_fs(ifsr); struct siginfo info; if (!inf->fn(addr, ifsr | FSR_LNX_PF, regs)) return; printk(KERN_ALERT "Unhandled prefetch abort: %s (0x%03x) at 0x%08lx ", inf->name, ifsr, addr); info.si_signo = inf->sig; info.si_errno = 0; info.si_code = inf->code; info.si_addr = (void __user *)addr; arm_notify_die("", regs, &info, ifsr, 0); |
1da177e4c Linux-2.6.12-rc2 |
569 |
} |
f7b8156d1 ARM: LPAE: Add fa... |
570 |
#ifndef CONFIG_ARM_LPAE |
993bf4ec8 ARM: 6256/1: Chec... |
571 572 573 574 575 576 |
static int __init exceptions_init(void) { if (cpu_architecture() >= CPU_ARCH_ARMv6) { hook_fault_code(4, do_translation_fault, SIGSEGV, SEGV_MAPERR, "I-cache maintenance fault"); } |
b8ab5397b ARM: 6268/1: ARMv... |
577 578 579 580 581 582 583 584 585 586 |
if (cpu_architecture() >= CPU_ARCH_ARMv7) { /* * TODO: Access flag faults introduced in ARMv6K. * Runtime check for 'K' extension is needed */ hook_fault_code(3, do_bad, SIGSEGV, SEGV_MAPERR, "section access flag fault"); hook_fault_code(6, do_bad, SIGSEGV, SEGV_MAPERR, "section access flag fault"); } |
993bf4ec8 ARM: 6256/1: Chec... |
587 588 589 590 |
return 0; } arch_initcall(exceptions_init); |
f7b8156d1 ARM: LPAE: Add fa... |
591 |
#endif |