diff options
Diffstat (limited to 'arch/sh/mm/tlbflush_64.c')
| -rw-r--r-- | arch/sh/mm/tlbflush_64.c | 294 |
1 files changed, 1 insertions, 293 deletions
diff --git a/arch/sh/mm/tlbflush_64.c b/arch/sh/mm/tlbflush_64.c index 11c5a18..f33fdd2 100644 --- a/arch/sh/mm/tlbflush_64.c +++ b/arch/sh/mm/tlbflush_64.c @@ -3,7 +3,7 @@ * * Copyright (C) 2000, 2001 Paolo Alberelli * Copyright (C) 2003 Richard Curnow (/proc/tlb, bug fixes) - * Copyright (C) 2003 - 2009 Paul Mundt + * Copyright (C) 2003 - 2012 Paul Mundt * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive @@ -28,294 +28,6 @@ #include <asm/pgalloc.h> #include <asm/mmu_context.h> -extern void die(const char *,struct pt_regs *,long); - -#define PFLAG(val,flag) (( (val) & (flag) ) ? #flag : "" ) -#define PPROT(flag) PFLAG(pgprot_val(prot),flag) - -static inline void print_prots(pgprot_t prot) -{ - printk("prot is 0x%016llx\n",pgprot_val(prot)); - - printk("%s %s %s %s %s\n",PPROT(_PAGE_SHARED),PPROT(_PAGE_READ), - PPROT(_PAGE_EXECUTE),PPROT(_PAGE_WRITE),PPROT(_PAGE_USER)); -} - -static inline void print_vma(struct vm_area_struct *vma) -{ - printk("vma start 0x%08lx\n", vma->vm_start); - printk("vma end 0x%08lx\n", vma->vm_end); - - print_prots(vma->vm_page_prot); - printk("vm_flags 0x%08lx\n", vma->vm_flags); -} - -static inline void print_task(struct task_struct *tsk) -{ - printk("Task pid %d\n", task_pid_nr(tsk)); -} - -static pte_t *lookup_pte(struct mm_struct *mm, unsigned long address) -{ - pgd_t *dir; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - pte_t entry; - - dir = pgd_offset(mm, address); - if (pgd_none(*dir)) - return NULL; - - pud = pud_offset(dir, address); - if (pud_none(*pud)) - return NULL; - - pmd = pmd_offset(pud, address); - if (pmd_none(*pmd)) - return NULL; - - pte = pte_offset_kernel(pmd, address); - entry = *pte; - if (pte_none(entry) || !pte_present(entry)) - return NULL; - - return pte; -} - -/* - * This routine handles page faults. It determines the address, - * and the problem, and then passes it off to one of the appropriate - * routines. - */ -asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long writeaccess, - unsigned long textaccess, unsigned long address) -{ - struct task_struct *tsk; - struct mm_struct *mm; - struct vm_area_struct * vma; - const struct exception_table_entry *fixup; - pte_t *pte; - int fault; - - /* SIM - * Note this is now called with interrupts still disabled - * This is to cope with being called for a missing IO port - * address with interrupts disabled. This should be fixed as - * soon as we have a better 'fast path' miss handler. - * - * Plus take care how you try and debug this stuff. - * For example, writing debug data to a port which you - * have just faulted on is not going to work. - */ - - tsk = current; - mm = tsk->mm; - - /* Not an IO address, so reenable interrupts */ - local_irq_enable(); - - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); - - /* - * If we're in an interrupt or have no user - * context, we must not take the fault.. - */ - if (in_atomic() || !mm) - goto no_context; - - /* TLB misses upon some cache flushes get done under cli() */ - down_read(&mm->mmap_sem); - - vma = find_vma(mm, address); - - if (!vma) { -#ifdef DEBUG_FAULT - print_task(tsk); - printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n", - __func__, __LINE__, - address,regs->pc,textaccess,writeaccess); - show_regs(regs); -#endif - goto bad_area; - } - if (vma->vm_start <= address) { - goto good_area; - } - - if (!(vma->vm_flags & VM_GROWSDOWN)) { -#ifdef DEBUG_FAULT - print_task(tsk); - printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n", - __func__, __LINE__, - address,regs->pc,textaccess,writeaccess); - show_regs(regs); - - print_vma(vma); -#endif - goto bad_area; - } - if (expand_stack(vma, address)) { -#ifdef DEBUG_FAULT - print_task(tsk); - printk("%s:%d fault, address is 0x%08x PC %016Lx textaccess %d writeaccess %d\n", - __func__, __LINE__, - address,regs->pc,textaccess,writeaccess); - show_regs(regs); -#endif - goto bad_area; - } -/* - * Ok, we have a good vm_area for this memory access, so - * we can handle it.. - */ -good_area: - if (textaccess) { - if (!(vma->vm_flags & VM_EXEC)) - goto bad_area; - } else { - if (writeaccess) { - if (!(vma->vm_flags & VM_WRITE)) - goto bad_area; - } else { - if (!(vma->vm_flags & VM_READ)) - goto bad_area; - } - } - - /* - * If for any reason at all we couldn't handle the fault, - * make sure we exit gracefully rather than endlessly redo - * the fault. - */ - fault = handle_mm_fault(mm, vma, address, writeaccess ? FAULT_FLAG_WRITE : 0); - if (unlikely(fault & VM_FAULT_ERROR)) { - if (fault & VM_FAULT_OOM) - goto out_of_memory; - else if (fault & VM_FAULT_SIGBUS) - goto do_sigbus; - BUG(); - } - - if (fault & VM_FAULT_MAJOR) { - tsk->maj_flt++; - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, - regs, address); - } else { - tsk->min_flt++; - perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, - regs, address); - } - - /* If we get here, the page fault has been handled. Do the TLB refill - now from the newly-setup PTE, to avoid having to fault again right - away on the same instruction. */ - pte = lookup_pte (mm, address); - if (!pte) { - /* From empirical evidence, we can get here, due to - !pte_present(pte). (e.g. if a swap-in occurs, and the page - is swapped back out again before the process that wanted it - gets rescheduled?) */ - goto no_pte; - } - - __do_tlb_refill(address, textaccess, pte); - -no_pte: - - up_read(&mm->mmap_sem); - return; - -/* - * Something tried to access memory that isn't in our memory map.. - * Fix it, but check if it's kernel or user first.. - */ -bad_area: -#ifdef DEBUG_FAULT - printk("fault:bad area\n"); -#endif - up_read(&mm->mmap_sem); - - if (user_mode(regs)) { - static int count=0; - siginfo_t info; - if (count < 4) { - /* This is really to help debug faults when starting - * usermode, so only need a few */ - count++; - printk("user mode bad_area address=%08lx pid=%d (%s) pc=%08lx\n", - address, task_pid_nr(current), current->comm, - (unsigned long) regs->pc); -#if 0 - show_regs(regs); -#endif - } - if (is_global_init(tsk)) { - panic("INIT had user mode bad_area\n"); - } - tsk->thread.address = address; - tsk->thread.error_code = writeaccess; - info.si_signo = SIGSEGV; - info.si_errno = 0; - info.si_addr = (void *) address; - force_sig_info(SIGSEGV, &info, tsk); - return; - } - -no_context: -#ifdef DEBUG_FAULT - printk("fault:No context\n"); -#endif - /* Are we prepared to handle this kernel fault? */ - fixup = search_exception_tables(regs->pc); - if (fixup) { - regs->pc = fixup->fixup; - return; - } - -/* - * Oops. The kernel tried to access some bad page. We'll have to - * terminate things with extreme prejudice. - * - */ - if (address < PAGE_SIZE) - printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference"); - else - printk(KERN_ALERT "Unable to handle kernel paging request"); - printk(" at virtual address %08lx\n", address); - printk(KERN_ALERT "pc = %08Lx%08Lx\n", regs->pc >> 32, regs->pc & 0xffffffff); - die("Oops", regs, writeaccess); - do_exit(SIGKILL); - -/* - * We ran out of memory, or some other thing happened to us that made - * us unable to handle the page fault gracefully. - */ -out_of_memory: - up_read(&mm->mmap_sem); - if (!user_mode(regs)) - goto no_context; - pagefault_out_of_memory(); - return; - -do_sigbus: - printk("fault:Do sigbus\n"); - up_read(&mm->mmap_sem); - - /* - * Send a sigbus, regardless of whether we were in kernel - * or user mode. - */ - tsk->thread.address = address; - tsk->thread.error_code = writeaccess; - tsk->thread.trap_no = 14; - force_sig(SIGBUS, tsk); - - /* Kernel mode? Handle exceptions or die */ - if (!user_mode(regs)) - goto no_context; -} - void local_flush_tlb_one(unsigned long asid, unsigned long page) { unsigned long long match, pteh=0, lpage; @@ -458,7 +170,3 @@ void __flush_tlb_global(void) { flush_tlb_all(); } - -void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte) -{ -} |