---
arch/m68k/mm/fault.c | 221 +--------------------
arch/m68k/mm/{fault.c => fault_mm.c} | 0
arch/{m68knommu/mm/fault.c => m68k/mm/fault_no.c} | 0
3 files changed, 4 insertions(+), 217 deletions(-)
copy arch/m68k/mm/{fault.c => fault_mm.c} (100%)
copy arch/{m68knommu/mm/fault.c => m68k/mm/fault_no.c} (100%)
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault.c
index d0e35cf..00e9bd2 100644
--- a/arch/m68k/mm/fault.c
+++ b/arch/m68k/mm/fault.c
@@ -1,218 +1,5 @@
-/*
- * linux/arch/m68k/mm/fault.c
- *
- * Copyright (C) 1995 Hamish Macdonald
- */
-
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/kernel.h>
-#include <linux/ptrace.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-
-#include <asm/setup.h>
-#include <asm/traps.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/pgalloc.h>
-
-extern void die_if_kernel(char *, struct pt_regs *, long);
-extern const int frame_extra_sizes[]; /* in m68k/kernel/signal.c */
-
-int send_fault_sig(struct pt_regs *regs)
-{
- siginfo_t siginfo = { 0, 0, 0, };
-
- siginfo.si_signo = current->thread.signo;
- siginfo.si_code = current->thread.code;
- siginfo.si_addr = (void *)current->thread.faddr;
-#ifdef DEBUG
- printk("send_fault_sig: %p,%d,%d\n", siginfo.si_addr, siginfo.si_signo,
siginfo.si_code);
+#ifdef CONFIG_MMU
+#include "fault_mm.c"
+#else
+#include "fault_no.c"
#endif
-
- if (user_mode(regs)) {
- force_sig_info(siginfo.si_signo,
- &siginfo, current);
- } else {
- const struct exception_table_entry *fixup;
-
- /* Are we prepared to handle this kernel fault? */
- if ((fixup = search_exception_tables(regs->pc))) {
- struct pt_regs *tregs;
- /* Create a new four word stack frame, discarding the
old
- one. */
- regs->stkadj = frame_extra_sizes[regs->format];
- tregs = (struct pt_regs *)((ulong)regs + regs->stkadj);
- tregs->vector = regs->vector;
- tregs->format = 0;
- tregs->pc = fixup->fixup;
- tregs->sr = regs->sr;
- return -1;
- }
-
- //if (siginfo.si_signo == SIGBUS)
- // force_sig_info(siginfo.si_signo,
- // &siginfo, current);
-
- /*
- * Oops. The kernel tried to access some bad page. We'll have to
- * terminate things with extreme prejudice.
- */
- if ((unsigned long)siginfo.si_addr < PAGE_SIZE)
- printk(KERN_ALERT "Unable to handle kernel NULL pointer
dereference");
- else
- printk(KERN_ALERT "Unable to handle kernel access");
- printk(" at virtual address %p\n", siginfo.si_addr);
- die_if_kernel("Oops", regs, 0 /*error_code*/);
- do_exit(SIGKILL);
- }
-
- return 1;
-}
-
-/*
- * This routine handles page faults. It determines the problem, and
- * then passes it off to one of the appropriate routines.
- *
- * error_code:
- * bit 0 == 0 means no page found, 1 means protection fault
- * bit 1 == 0 means read, 1 means write
- *
- * If this routine detects a bad access, it returns 1, otherwise it
- * returns 0.
- */
-int do_page_fault(struct pt_regs *regs, unsigned long address,
- unsigned long error_code)
-{
- struct mm_struct *mm = current->mm;
- struct vm_area_struct * vma;
- int write, fault;
-
-#ifdef DEBUG
- printk ("do page fault:\nregs->sr=%#x, regs->pc=%#lx, address=%#lx,
%ld, %p\n",
- regs->sr, regs->pc, address, error_code,
- current->mm->pgd);
-#endif
-
- /*
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- if (in_atomic() || !mm)
- goto no_context;
-
- down_read(&mm->mmap_sem);
-
- vma = find_vma(mm, address);
- if (!vma)
- goto map_err;
- if (vma->vm_flags & VM_IO)
- goto acc_err;
- if (vma->vm_start <= address)
- goto good_area;
- if (!(vma->vm_flags & VM_GROWSDOWN))
- goto map_err;
- if (user_mode(regs)) {
- /* Accessing the stack below usp is always a bug. The
- "+ 256" is there due to some instructions doing
- pre-decrement on the stack and that doesn't show up
- until later. */
- if (address + 256 < rdusp())
- goto map_err;
- }
- if (expand_stack(vma, address))
- goto map_err;
-
-/*
- * Ok, we have a good vm_area for this memory access, so
- * we can handle it..
- */
-good_area:
-#ifdef DEBUG
- printk("do_page_fault: good_area\n");
-#endif
- write = 0;
- switch (error_code & 3) {
- default: /* 3: write, present */
- /* fall through */
- case 2: /* write, not present */
- if (!(vma->vm_flags & VM_WRITE))
- goto acc_err;
- write++;
- break;
- case 1: /* read, present */
- goto acc_err;
- case 0: /* read, not present */
- if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
- goto acc_err;
- }
-
- /*
- * If for any reason at all we couldn't handle the fault,
- * make sure we exit gracefully rather than endlessly redo
- * the fault.
- */
-
- survive:
- fault = handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0);
-#ifdef DEBUG
- printk("handle_mm_fault returns %d\n",fault);
-#endif
- if (unlikely(fault & VM_FAULT_ERROR)) {
- if (fault & VM_FAULT_OOM)
- goto out_of_memory;
- else if (fault & VM_FAULT_SIGBUS)
- goto bus_err;
- BUG();
- }
- if (fault & VM_FAULT_MAJOR)
- current->maj_flt++;
- else
- current->min_flt++;
-
- up_read(&mm->mmap_sem);
- return 0;
-
-/*
- * 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 (is_global_init(current)) {
- yield();
- down_read(&mm->mmap_sem);
- goto survive;
- }
-
- printk("VM: killing process %s\n", current->comm);
- if (user_mode(regs))
- do_group_exit(SIGKILL);
-
-no_context:
- current->thread.signo = SIGBUS;
- current->thread.faddr = address;
- return send_fault_sig(regs);
-
-bus_err:
- current->thread.signo = SIGBUS;
- current->thread.code = BUS_ADRERR;
- current->thread.faddr = address;
- goto send_sig;
-
-map_err:
- current->thread.signo = SIGSEGV;
- current->thread.code = SEGV_MAPERR;
- current->thread.faddr = address;
- goto send_sig;
-
-acc_err:
- current->thread.signo = SIGSEGV;
- current->thread.code = SEGV_ACCERR;
- current->thread.faddr = address;
-
-send_sig:
- up_read(&mm->mmap_sem);
- return send_fault_sig(regs);
-}
diff --git a/arch/m68k/mm/fault.c b/arch/m68k/mm/fault_mm.c
similarity index 100%
copy from arch/m68k/mm/fault.c
copy to arch/m68k/mm/fault_mm.c
diff --git a/arch/m68knommu/mm/fault.c b/arch/m68k/mm/fault_no.c
similarity index 100%
copy from arch/m68knommu/mm/fault.c
copy to arch/m68k/mm/fault_no.c
--
1.5.6.5
_______________________________________________
uClinux-dev mailing list
uClinux-dev@uclinux.org
http://mailman.uclinux.org/mailman/listinfo/uclinux-dev
This message was resent by uclinux-dev@uclinux.org
To unsubscribe see:
http://mailman.uclinux.org/mailman/options/uclinux-dev
