diff options
Diffstat (limited to 'arch/score/mm/fault.c')
| -rw-r--r-- | arch/score/mm/fault.c | 237 |
1 files changed, 0 insertions, 237 deletions
diff --git a/arch/score/mm/fault.c b/arch/score/mm/fault.c deleted file mode 100644 index b85fad4f0874..000000000000 --- a/arch/score/mm/fault.c +++ /dev/null @@ -1,237 +0,0 @@ -/* - * arch/score/mm/fault.c - * - * Score Processor version. - * - * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. - * Lennox Wu <lennox.wu@sunplusct.com> - * Chen Liqin <liqin.chen@sunplusct.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see the file COPYING, or write - * to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include <linux/errno.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/mman.h> -#include <linux/extable.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/string.h> -#include <linux/types.h> -#include <linux/ptrace.h> -#include <linux/uaccess.h> - -/* - * 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 write, - unsigned long address) -{ - struct vm_area_struct *vma = NULL; - struct task_struct *tsk = current; - struct mm_struct *mm = tsk->mm; - const int field = sizeof(unsigned long) * 2; - unsigned long flags = 0; - siginfo_t info; - int fault; - - info.si_code = SEGV_MAPERR; - - /* - * We fault-in kernel-space virtual memory on-demand. The - * 'reference' page table is init_mm.pgd. - * - * 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. - */ - if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END)) - goto vmalloc_fault; -#ifdef MODULE_START - if (unlikely(address >= MODULE_START && address < MODULE_END)) - goto vmalloc_fault; -#endif - - /* - * If we're in an interrupt or have no user - * context, we must not take the fault.. - */ - if (pagefault_disabled() || !mm) - goto bad_area_nosemaphore; - - if (user_mode(regs)) - flags |= FAULT_FLAG_USER; - - down_read(&mm->mmap_sem); - vma = find_vma(mm, address); - if (!vma) - goto bad_area; - if (vma->vm_start <= address) - goto good_area; - if (!(vma->vm_flags & VM_GROWSDOWN)) - goto bad_area; - if (expand_stack(vma, address)) - goto bad_area; - /* - * Ok, we have a good vm_area for this memory access, so - * we can handle it.. - */ -good_area: - info.si_code = SEGV_ACCERR; - - if (write) { - if (!(vma->vm_flags & VM_WRITE)) - goto bad_area; - flags |= FAULT_FLAG_WRITE; - } else { - if (!(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC))) - 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(vma, address, flags); - if (unlikely(fault & VM_FAULT_ERROR)) { - if (fault & VM_FAULT_OOM) - goto out_of_memory; - else if (fault & VM_FAULT_SIGSEGV) - goto bad_area; - else if (fault & VM_FAULT_SIGBUS) - goto do_sigbus; - BUG(); - } - if (fault & VM_FAULT_MAJOR) - tsk->maj_flt++; - else - tsk->min_flt++; - - 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: - up_read(&mm->mmap_sem); - -bad_area_nosemaphore: - /* User mode accesses just cause a SIGSEGV */ - if (user_mode(regs)) { - tsk->thread.cp0_badvaddr = address; - tsk->thread.error_code = write; - info.si_signo = SIGSEGV; - info.si_errno = 0; - /* info.si_code has been set above */ - info.si_addr = (void __user *) address; - force_sig_info(SIGSEGV, &info, tsk); - return; - } - -no_context: - /* Are we prepared to handle this kernel fault? */ - if (fixup_exception(regs)) { - current->thread.cp0_baduaddr = address; - return; - } - - /* - * Oops. The kernel tried to access some bad page. We'll have to - * terminate things with extreme prejudice. - */ - bust_spinlocks(1); - - printk(KERN_ALERT "CPU %d Unable to handle kernel paging request at " - "virtual address %0*lx, epc == %0*lx, ra == %0*lx\n", - 0, field, address, field, regs->cp0_epc, - field, regs->regs[3]); - die("Oops", regs); - - /* - * 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: - up_read(&mm->mmap_sem); - /* Kernel mode? Handle exceptions or die */ - if (!user_mode(regs)) - goto no_context; - else - /* - * Send a sigbus, regardless of whether we were in kernel - * or user mode. - */ - tsk->thread.cp0_badvaddr = address; - info.si_signo = SIGBUS; - info.si_errno = 0; - info.si_code = BUS_ADRERR; - info.si_addr = (void __user *) address; - force_sig_info(SIGBUS, &info, tsk); - return; -vmalloc_fault: - { - /* - * Synchronize this task's top level page-table - * with the 'reference' page table. - * - * Do _not_ use "tsk" here. We might be inside - * an interrupt in the middle of a task switch.. - */ - int offset = __pgd_offset(address); - pgd_t *pgd, *pgd_k; - pud_t *pud, *pud_k; - pmd_t *pmd, *pmd_k; - pte_t *pte_k; - - pgd = (pgd_t *) pgd_current + offset; - pgd_k = init_mm.pgd + offset; - - if (!pgd_present(*pgd_k)) - goto no_context; - set_pgd(pgd, *pgd_k); - - pud = pud_offset(pgd, address); - pud_k = pud_offset(pgd_k, address); - if (!pud_present(*pud_k)) - goto no_context; - - pmd = pmd_offset(pud, address); - pmd_k = pmd_offset(pud_k, address); - if (!pmd_present(*pmd_k)) - goto no_context; - set_pmd(pmd, *pmd_k); - - pte_k = pte_offset_kernel(pmd_k, address); - if (!pte_present(*pte_k)) - goto no_context; - return; - } -} |