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Diffstat (limited to 'arch/mn10300/mm/fault.c')
-rw-r--r--arch/mn10300/mm/fault.c414
1 files changed, 0 insertions, 414 deletions
diff --git a/arch/mn10300/mm/fault.c b/arch/mn10300/mm/fault.c
deleted file mode 100644
index f0bfa1448744..000000000000
--- a/arch/mn10300/mm/fault.c
+++ /dev/null
@@ -1,414 +0,0 @@
-/* MN10300 MMU Fault handler
- *
- * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Modified by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/vt_kern.h> /* For unblank_screen() */
-#include <linux/uaccess.h>
-
-#include <asm/pgalloc.h>
-#include <asm/hardirq.h>
-#include <asm/cpu-regs.h>
-#include <asm/debugger.h>
-#include <asm/gdb-stub.h>
-
-/*
- * Unlock any spinlocks which will prevent us from getting the
- * message out
- */
-void bust_spinlocks(int yes)
-{
- if (yes) {
- oops_in_progress = 1;
- } else {
- int loglevel_save = console_loglevel;
-#ifdef CONFIG_VT
- unblank_screen();
-#endif
- oops_in_progress = 0;
- /*
- * OK, the message is on the console. Now we call printk()
- * without oops_in_progress set so that printk will give klogd
- * a poke. Hold onto your hats...
- */
- console_loglevel = 15; /* NMI oopser may have shut the console
- * up */
- printk(" ");
- console_loglevel = loglevel_save;
- }
-}
-
-void do_BUG(const char *file, int line)
-{
- bust_spinlocks(1);
- printk(KERN_EMERG CUT_HERE);
- printk(KERN_EMERG "kernel BUG at %s:%d!\n", file, line);
-}
-
-#if 0
-static void print_pagetable_entries(pgd_t *pgdir, unsigned long address)
-{
- pgd_t *pgd;
- pmd_t *pmd;
- pte_t *pte;
-
- pgd = pgdir + __pgd_offset(address);
- printk(KERN_DEBUG "pgd entry %p: %016Lx\n",
- pgd, (long long) pgd_val(*pgd));
-
- if (!pgd_present(*pgd)) {
- printk(KERN_DEBUG "... pgd not present!\n");
- return;
- }
- pmd = pmd_offset(pgd, address);
- printk(KERN_DEBUG "pmd entry %p: %016Lx\n",
- pmd, (long long)pmd_val(*pmd));
-
- if (!pmd_present(*pmd)) {
- printk(KERN_DEBUG "... pmd not present!\n");
- return;
- }
- pte = pte_offset(pmd, address);
- printk(KERN_DEBUG "pte entry %p: %016Lx\n",
- pte, (long long) pte_val(*pte));
-
- if (!pte_present(*pte))
- printk(KERN_DEBUG "... pte not present!\n");
-}
-#endif
-
-/*
- * This routine handles page faults. It determines the address,
- * and the problem, and then passes it off to one of the appropriate
- * routines.
- *
- * fault_code:
- * - LSW: either MMUFCR_IFC or MMUFCR_DFC as appropriate
- * - MSW: 0 if data access, 1 if instruction access
- * - bit 0: TLB miss flag
- * - bit 1: initial write
- * - bit 2: page invalid
- * - bit 3: protection violation
- * - bit 4: accessor (0=user 1=kernel)
- * - bit 5: 0=read 1=write
- * - bit 6-8: page protection spec
- * - bit 9: illegal address
- * - bit 16: 0=data 1=ins
- *
- */
-asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long fault_code,
- unsigned long address)
-{
- struct vm_area_struct *vma;
- struct task_struct *tsk;
- struct mm_struct *mm;
- unsigned long page;
- siginfo_t info;
- int fault;
- unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
-
-#ifdef CONFIG_GDBSTUB
- /* handle GDB stub causing a fault */
- if (gdbstub_busy) {
- gdbstub_exception(regs, TBR & TBR_INT_CODE);
- return;
- }
-#endif
-
-#if 0
- printk(KERN_DEBUG "--- do_page_fault(%p,%s:%04lx,%08lx)\n",
- regs,
- fault_code & 0x10000 ? "ins" : "data",
- fault_code & 0xffff, address);
-#endif
-
- tsk = current;
-
- /*
- * 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.
- *
- * This verifies that the fault happens in kernel space
- * and that the fault was a page not present (invalid) error
- */
- if (address >= VMALLOC_START && address < VMALLOC_END &&
- (fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_SR &&
- (fault_code & MMUFCR_xFC_PGINVAL) == MMUFCR_xFC_PGINVAL
- )
- goto vmalloc_fault;
-
- mm = tsk->mm;
- info.si_code = SEGV_MAPERR;
-
- /*
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_USR)
- flags |= FAULT_FLAG_USER;
-retry:
- 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 ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_USR) {
- /* accessing the stack below the stack pointer is always a
- * bug */
- if ((address & PAGE_MASK) + 2 * PAGE_SIZE < regs->sp) {
-#if 0
- printk(KERN_WARNING
- "[%d] ### Access below stack @%lx (sp=%lx)\n",
- current->pid, address, regs->sp);
- printk(KERN_WARNING
- "vma [%08x - %08x]\n",
- vma->vm_start, vma->vm_end);
- show_registers(regs);
- printk(KERN_WARNING
- "[%d] ### Code: [%08lx]"
- " %02x %02x %02x %02x %02x %02x %02x %02x\n",
- current->pid,
- regs->pc,
- ((u8 *) regs->pc)[0],
- ((u8 *) regs->pc)[1],
- ((u8 *) regs->pc)[2],
- ((u8 *) regs->pc)[3],
- ((u8 *) regs->pc)[4],
- ((u8 *) regs->pc)[5],
- ((u8 *) regs->pc)[6],
- ((u8 *) regs->pc)[7]
- );
-#endif
- 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;
- switch (fault_code & (MMUFCR_xFC_PGINVAL|MMUFCR_xFC_TYPE)) {
- default: /* 3: write, present */
- case MMUFCR_xFC_TYPE_WRITE:
-#ifdef TEST_VERIFY_AREA
- if ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_SR)
- printk(KERN_DEBUG "WP fault at %08lx\n", regs->pc);
-#endif
- /* write to absent page */
- case MMUFCR_xFC_PGINVAL | MMUFCR_xFC_TYPE_WRITE:
- if (!(vma->vm_flags & VM_WRITE))
- goto bad_area;
- flags |= FAULT_FLAG_WRITE;
- break;
-
- /* read from protected page */
- case MMUFCR_xFC_TYPE_READ:
- goto bad_area;
-
- /* read from absent page present */
- case MMUFCR_xFC_PGINVAL | MMUFCR_xFC_TYPE_READ:
- if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
- goto bad_area;
- break;
- }
-
- /*
- * 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 ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
- return;
-
- 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 (flags & FAULT_FLAG_ALLOW_RETRY) {
- if (fault & VM_FAULT_MAJOR)
- current->maj_flt++;
- else
- current->min_flt++;
- if (fault & VM_FAULT_RETRY) {
- flags &= ~FAULT_FLAG_ALLOW_RETRY;
-
- /* No need to up_read(&mm->mmap_sem) as we would
- * have already released it in __lock_page_or_retry
- * in mm/filemap.c.
- */
-
- goto retry;
- }
- }
-
- 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);
-
- /* User mode accesses just cause a SIGSEGV */
- if ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_USR) {
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- /* info.si_code has been set above */
- info.si_addr = (void *)address;
- force_sig_info(SIGSEGV, &info, tsk);
- return;
- }
-
-no_context:
- /* Are we prepared to handle this kernel fault? */
- if (fixup_exception(regs))
- return;
-
-/*
- * Oops. The kernel tried to access some bad page. We'll have to
- * terminate things with extreme prejudice.
- */
-
- bust_spinlocks(1);
-
- 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(" printing pc:\n");
- printk(KERN_ALERT "%08lx\n", regs->pc);
-
- debugger_intercept(fault_code & 0x00010000 ? EXCEP_IAERROR : EXCEP_DAERROR,
- SIGSEGV, SEGV_ACCERR, regs);
-
- page = PTBR;
- page = ((unsigned long *) __va(page))[address >> 22];
- printk(KERN_ALERT "*pde = %08lx\n", page);
- if (page & 1) {
- page &= PAGE_MASK;
- address &= 0x003ff000;
- page = ((unsigned long *) __va(page))[address >> PAGE_SHIFT];
- printk(KERN_ALERT "*pte = %08lx\n", page);
- }
-
- die("Oops", regs, fault_code);
- 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 ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_USR) {
- pagefault_out_of_memory();
- return;
- }
- goto no_context;
-
-do_sigbus:
- up_read(&mm->mmap_sem);
-
- /*
- * Send a sigbus, regardless of whether we were in kernel
- * or user mode.
- */
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void *)address;
- force_sig_info(SIGBUS, &info, tsk);
-
- /* Kernel mode? Handle exceptions or die */
- if ((fault_code & MMUFCR_xFC_ACCESS) == MMUFCR_xFC_ACCESS_SR)
- goto no_context;
- 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 index = pgd_index(address);
- pgd_t *pgd, *pgd_k;
- pud_t *pud, *pud_k;
- pmd_t *pmd, *pmd_k;
- pte_t *pte_k;
-
- pgd_k = init_mm.pgd + index;
-
- if (!pgd_present(*pgd_k))
- goto no_context;
-
- pud_k = pud_offset(pgd_k, address);
- if (!pud_present(*pud_k))
- goto no_context;
-
- pmd_k = pmd_offset(pud_k, address);
- if (!pmd_present(*pmd_k))
- goto no_context;
-
- pgd = (pgd_t *) PTBR + index;
- pud = pud_offset(pgd, address);
- pmd = pmd_offset(pud, address);
- set_pmd(pmd, *pmd_k);
-
- pte_k = pte_offset_kernel(pmd_k, address);
- if (!pte_present(*pte_k))
- goto no_context;
- return;
- }
-}
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