#
obj-y := consistent.o extable.o fault-armv.o \
- fault-common.o init.o ioremap.o mmap.o mm-armv.o
+ fault.o init.o ioremap.o mmap.o mm-armv.o
obj-$(CONFIG_MODULES) += proc-syms.o
*/
#include <linux/sched.h>
#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
#include <linux/mm.h>
#include <linux/bitops.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <asm/cacheflush.h>
-#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
-#include "fault.h"
-
-/*
- * 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)
-{
- struct task_struct *tsk = current;
- do_bad_area(tsk, tsk->active_mm, addr, fsr, regs);
- return 0;
-}
-
-/*
- * This abort handler always returns "fault".
- */
-static int
-do_bad(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
- return 1;
-}
-
-static struct fsr_info {
- int (*fn)(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
- int sig;
- const char *name;
-} fsr_info[] = {
- /*
- * The following are the standard ARMv3 and ARMv4 aborts. ARMv5
- * defines these to be "precise" aborts.
- */
- { do_bad, SIGSEGV, "vector exception" },
- { do_bad, SIGILL, "alignment exception" },
- { do_bad, SIGKILL, "terminal exception" },
- { do_bad, SIGILL, "alignment exception" },
- { do_bad, SIGBUS, "external abort on linefetch" },
- { do_translation_fault, SIGSEGV, "section translation fault" },
- { do_bad, SIGBUS, "external abort on linefetch" },
- { do_page_fault, SIGSEGV, "page translation fault" },
- { do_bad, SIGBUS, "external abort on non-linefetch" },
- { do_bad, SIGSEGV, "section domain fault" },
- { do_bad, SIGBUS, "external abort on non-linefetch" },
- { do_bad, SIGSEGV, "page domain fault" },
- { do_bad, SIGBUS, "external abort on translation" },
- { do_sect_fault, SIGSEGV, "section permission fault" },
- { do_bad, SIGBUS, "external abort on translation" },
- { do_page_fault, SIGSEGV, "page permission fault" },
- /*
- * The following are "imprecise" aborts, which are signalled by bit
- * 10 of the FSR, and may not be recoverable. These are only
- * supported if the CPU abort handler supports bit 10.
- */
- { do_bad, SIGBUS, "unknown 16" },
- { do_bad, SIGBUS, "unknown 17" },
- { do_bad, SIGBUS, "unknown 18" },
- { do_bad, SIGBUS, "unknown 19" },
- { do_bad, SIGBUS, "lock abort" }, /* xscale */
- { do_bad, SIGBUS, "unknown 21" },
- { do_bad, SIGBUS, "imprecise external abort" }, /* xscale */
- { do_bad, SIGBUS, "unknown 23" },
- { do_bad, SIGBUS, "dcache parity error" }, /* xscale */
- { do_bad, SIGBUS, "unknown 25" },
- { do_bad, SIGBUS, "unknown 26" },
- { do_bad, SIGBUS, "unknown 27" },
- { do_bad, SIGBUS, "unknown 28" },
- { do_bad, SIGBUS, "unknown 29" },
- { do_bad, SIGBUS, "unknown 30" },
- { do_bad, SIGBUS, "unknown 31" }
-};
-
-void __init
-hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
- int sig, const char *name)
-{
- if (nr >= 0 && nr < ARRAY_SIZE(fsr_info)) {
- fsr_info[nr].fn = fn;
- fsr_info[nr].sig = sig;
- fsr_info[nr].name = name;
- }
-}
-
-/*
- * Dispatch a data abort to the relevant handler.
- */
-asmlinkage void
-do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
- const struct fsr_info *inf = fsr_info + (fsr & 15) + ((fsr & (1 << 10)) >> 6);
-
- if (!inf->fn(addr, fsr, regs))
- return;
-
- printk(KERN_ALERT "Unhandled fault: %s (0x%03x) at 0x%08lx\n",
- inf->name, fsr, addr);
- force_sig(inf->sig, current);
- show_pte(current->mm, addr);
- die_if_kernel("Oops", regs, 0);
-}
-
-asmlinkage void
-do_PrefetchAbort(unsigned long addr, struct pt_regs *regs)
-{
- do_translation_fault(addr, 0, regs);
-}
-
static unsigned long shared_pte_mask = L_PTE_CACHEABLE;
/*
+++ /dev/null
-/*
- * linux/arch/arm/mm/fault-common.c
- *
- * Copyright (C) 1995 Linus Torvalds
- * Modifications for ARM processor (c) 1995-2001 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.
- */
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/ptrace.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-
-#include <asm/system.h>
-#include <asm/pgtable.h>
-#include <asm/tlbflush.h>
-#include <asm/uaccess.h>
-
-#include "fault.h"
-
-#ifdef CONFIG_CPU_26
-#define FAULT_CODE_WRITE 0x02
-#define FAULT_CODE_FORCECOW 0x01
-#define DO_COW(m) ((m) & (FAULT_CODE_WRITE|FAULT_CODE_FORCECOW))
-#define READ_FAULT(m) (!((m) & FAULT_CODE_WRITE))
-#else
-/*
- * "code" is actually the FSR register. Bit 11 set means the
- * instruction was performing a write.
- */
-#define DO_COW(code) ((code) & (1 << 11))
-#define READ_FAULT(code) (!DO_COW(code))
-#endif
-
-/*
- * 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\n", mm->pgd);
- pgd = pgd_offset(mm, addr);
- printk(KERN_ALERT "[%08lx] *pgd=%08lx", addr, pgd_val(*pgd));
-
- do {
- pmd_t *pmd;
- pte_t *pte;
-
- if (pgd_none(*pgd))
- break;
-
- if (pgd_bad(*pgd)) {
- printk("(bad)");
- break;
- }
-
- pmd = pmd_offset(pgd, addr);
-#if PTRS_PER_PMD != 1
- printk(", *pmd=%08lx", pmd_val(*pmd));
-#endif
-
- if (pmd_none(*pmd))
- break;
-
- if (pmd_bad(*pmd)) {
- printk("(bad)");
- break;
- }
-
-#ifndef CONFIG_HIGHMEM
- /* We must not map this if we have highmem enabled */
- pte = pte_offset_map(pmd, addr);
- printk(", *pte=%08lx", pte_val(*pte));
-#ifdef CONFIG_CPU_32
- printk(", *ppte=%08lx", pte_val(pte[-PTRS_PER_PTE]));
-#endif
- pte_unmap(pte);
-#endif
- } while(0);
-
- printk("\n");
-}
-
-/*
- * 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\n",
- (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,
- unsigned int fsr, int code, struct pt_regs *regs)
-{
- struct siginfo si;
-
-#ifdef CONFIG_DEBUG_USER
- if (user_debug & UDBG_SEGV) {
- printk(KERN_DEBUG "%s: unhandled page fault at 0x%08lx, code 0x%03x\n",
- tsk->comm, addr, fsr);
- show_pte(tsk->mm, addr);
- show_regs(regs);
- }
-#endif
-
- tsk->thread.address = addr;
- tsk->thread.error_code = fsr;
- tsk->thread.trap_no = 14;
- si.si_signo = SIGSEGV;
- si.si_errno = 0;
- si.si_code = code;
- si.si_addr = (void *)addr;
- force_sig_info(SIGSEGV, &si, tsk);
-}
-
-void
-do_bad_area(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr,
- unsigned int fsr, struct pt_regs *regs)
-{
- /*
- * If we are in kernel mode at this point, we
- * have no context to handle this fault with.
- */
- if (user_mode(regs))
- __do_user_fault(tsk, addr, fsr, SEGV_MAPERR, regs);
- else
- __do_kernel_fault(mm, addr, fsr, regs);
-}
-
-#define VM_FAULT_BADMAP (-20)
-#define VM_FAULT_BADACCESS (-21)
-
-static int
-__do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
- struct task_struct *tsk)
-{
- struct vm_area_struct *vma;
- int fault, mask;
-
- vma = find_vma(mm, addr);
- fault = VM_FAULT_BADMAP;
- if (!vma)
- goto out;
- if (vma->vm_start > addr)
- goto check_stack;
-
- /*
- * Ok, we have a good vm_area for this
- * memory access, so we can handle it.
- */
-good_area:
- if (READ_FAULT(fsr)) /* read? */
- mask = VM_READ|VM_EXEC;
- else
- mask = VM_WRITE;
-
- fault = VM_FAULT_BADACCESS;
- if (!(vma->vm_flags & mask))
- goto out;
-
- /*
- * 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, addr & PAGE_MASK, DO_COW(fsr));
-
- /*
- * Handle the "normal" cases first - successful and sigbus
- */
- switch (fault) {
- case VM_FAULT_MAJOR:
- tsk->maj_flt++;
- return fault;
- case VM_FAULT_MINOR:
- tsk->min_flt++;
- case VM_FAULT_SIGBUS:
- return fault;
- }
-
- if (tsk->pid != 1)
- goto out;
-
- /*
- * If we are out of memory for pid1,
- * sleep for a while and retry
- */
- yield();
- goto survive;
-
-check_stack:
- if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr))
- goto good_area;
-out:
- return fault;
-}
-
-int do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
- struct task_struct *tsk;
- struct mm_struct *mm;
- int fault;
-
- tsk = current;
- mm = tsk->mm;
-
- /*
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- if (in_interrupt() || !mm)
- goto no_context;
-
- down_read(&mm->mmap_sem);
- fault = __do_page_fault(mm, addr, fsr, tsk);
- up_read(&mm->mmap_sem);
-
- /*
- * Handle the "normal" case first
- */
- if (fault > 0)
- return 0;
-
- /*
- * We had some memory, but were unable to
- * successfully fix up this page fault.
- */
- if (fault == 0)
- goto do_sigbus;
-
- /*
- * 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;
-
- if (fault == VM_FAULT_OOM) {
- /*
- * We ran out of memory, or some other thing happened to
- * us that made us unable to handle the page fault gracefully.
- */
- printk("VM: killing process %s\n", tsk->comm);
- do_exit(SIGKILL);
- } else
- __do_user_fault(tsk, addr, fsr, fault == VM_FAULT_BADACCESS ?
- SEGV_ACCERR : SEGV_MAPERR, regs);
- return 0;
-
-
-/*
- * We ran out of memory, or some other thing happened to us that made
- * us unable to handle the page fault gracefully.
- */
-do_sigbus:
- /*
- * Send a sigbus, regardless of whether we were in kernel
- * or user mode.
- */
- tsk->thread.address = addr;
- tsk->thread.error_code = fsr;
- tsk->thread.trap_no = 14;
- force_sig(SIGBUS, tsk);
-#ifdef CONFIG_DEBUG_USER
- if (user_debug & UDBG_BUS) {
- printk(KERN_DEBUG "%s: sigbus at 0x%08lx, pc=0x%08lx\n",
- current->comm, addr, instruction_pointer(regs));
- }
-#endif
-
- /* Kernel mode? Handle exceptions or die */
- if (user_mode(regs))
- return 0;
-
-no_context:
- __do_kernel_fault(mm, addr, fsr, regs);
- return 0;
-}
-
-/*
- * 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.
- */
-int do_translation_fault(unsigned long addr, unsigned int fsr,
- struct pt_regs *regs)
-{
- struct task_struct *tsk;
- unsigned int index;
- pgd_t *pgd, *pgd_k;
- pmd_t *pmd, *pmd_k;
-
- if (addr < TASK_SIZE)
- return do_page_fault(addr, fsr, regs);
-
- 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;
-
- if (!pgd_present(*pgd))
- set_pgd(pgd, *pgd_k);
-
- pmd_k = pmd_offset(pgd_k, addr);
- pmd = pmd_offset(pgd, addr);
-
- if (pmd_none(*pmd_k))
- goto bad_area;
-
- set_pmd(pmd, *pmd_k);
- return 0;
-
-bad_area:
- tsk = current;
-
- do_bad_area(tsk, tsk->active_mm, addr, fsr, regs);
- return 0;
-}
--- /dev/null
+/*
+ * 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.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/ptrace.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+
+#include <asm/system.h>
+#include <asm/pgtable.h>
+#include <asm/tlbflush.h>
+#include <asm/uaccess.h>
+
+#include "fault.h"
+
+/*
+ * 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\n", mm->pgd);
+ pgd = pgd_offset(mm, addr);
+ printk(KERN_ALERT "[%08lx] *pgd=%08lx", addr, pgd_val(*pgd));
+
+ do {
+ pmd_t *pmd;
+ pte_t *pte;
+
+ if (pgd_none(*pgd))
+ break;
+
+ if (pgd_bad(*pgd)) {
+ printk("(bad)");
+ break;
+ }
+
+ pmd = pmd_offset(pgd, addr);
+#if PTRS_PER_PMD != 1
+ printk(", *pmd=%08lx", pmd_val(*pmd));
+#endif
+
+ if (pmd_none(*pmd))
+ break;
+
+ if (pmd_bad(*pmd)) {
+ printk("(bad)");
+ break;
+ }
+
+#ifndef CONFIG_HIGHMEM
+ /* We must not map this if we have highmem enabled */
+ pte = pte_offset_map(pmd, addr);
+ printk(", *pte=%08lx", pte_val(*pte));
+#ifdef CONFIG_CPU_32
+ printk(", *ppte=%08lx", pte_val(pte[-PTRS_PER_PTE]));
+#endif
+ pte_unmap(pte);
+#endif
+ } while(0);
+
+ printk("\n");
+}
+
+/*
+ * 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\n",
+ (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,
+ unsigned int fsr, int code, struct pt_regs *regs)
+{
+ struct siginfo si;
+
+#ifdef CONFIG_DEBUG_USER
+ if (user_debug & UDBG_SEGV) {
+ printk(KERN_DEBUG "%s: unhandled page fault at 0x%08lx, code 0x%03x\n",
+ tsk->comm, addr, fsr);
+ show_pte(tsk->mm, addr);
+ show_regs(regs);
+ }
+#endif
+
+ tsk->thread.address = addr;
+ tsk->thread.error_code = fsr;
+ tsk->thread.trap_no = 14;
+ si.si_signo = SIGSEGV;
+ si.si_errno = 0;
+ si.si_code = code;
+ si.si_addr = (void *)addr;
+ force_sig_info(SIGSEGV, &si, tsk);
+}
+
+void
+do_bad_area(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr,
+ unsigned int fsr, struct pt_regs *regs)
+{
+ /*
+ * If we are in kernel mode at this point, we
+ * have no context to handle this fault with.
+ */
+ if (user_mode(regs))
+ __do_user_fault(tsk, addr, fsr, SEGV_MAPERR, regs);
+ else
+ __do_kernel_fault(mm, addr, fsr, regs);
+}
+
+#define VM_FAULT_BADMAP (-20)
+#define VM_FAULT_BADACCESS (-21)
+
+static int
+__do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
+ struct task_struct *tsk)
+{
+ struct vm_area_struct *vma;
+ int fault, mask;
+
+ vma = find_vma(mm, addr);
+ fault = VM_FAULT_BADMAP;
+ if (!vma)
+ goto out;
+ if (vma->vm_start > addr)
+ goto check_stack;
+
+ /*
+ * Ok, we have a good vm_area for this
+ * memory access, so we can handle it.
+ */
+good_area:
+ if (fsr & (1 << 11)) /* write? */
+ mask = VM_WRITE;
+ else
+ mask = VM_READ|VM_EXEC;
+
+ fault = VM_FAULT_BADACCESS;
+ if (!(vma->vm_flags & mask))
+ goto out;
+
+ /*
+ * 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, addr & PAGE_MASK, fsr & (1 << 11));
+
+ /*
+ * Handle the "normal" cases first - successful and sigbus
+ */
+ switch (fault) {
+ case VM_FAULT_MAJOR:
+ tsk->maj_flt++;
+ return fault;
+ case VM_FAULT_MINOR:
+ tsk->min_flt++;
+ case VM_FAULT_SIGBUS:
+ return fault;
+ }
+
+ if (tsk->pid != 1)
+ goto out;
+
+ /*
+ * If we are out of memory for pid1,
+ * sleep for a while and retry
+ */
+ yield();
+ goto survive;
+
+check_stack:
+ if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr))
+ goto good_area;
+out:
+ return fault;
+}
+
+static int
+do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
+{
+ struct task_struct *tsk;
+ struct mm_struct *mm;
+ int fault;
+
+ tsk = current;
+ mm = tsk->mm;
+
+ /*
+ * If we're in an interrupt or have no user
+ * context, we must not take the fault..
+ */
+ if (in_interrupt() || !mm)
+ goto no_context;
+
+ down_read(&mm->mmap_sem);
+ fault = __do_page_fault(mm, addr, fsr, tsk);
+ up_read(&mm->mmap_sem);
+
+ /*
+ * Handle the "normal" case first
+ */
+ if (fault > 0)
+ return 0;
+
+ /*
+ * We had some memory, but were unable to
+ * successfully fix up this page fault.
+ */
+ if (fault == 0)
+ goto do_sigbus;
+
+ /*
+ * 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;
+
+ if (fault == VM_FAULT_OOM) {
+ /*
+ * We ran out of memory, or some other thing happened to
+ * us that made us unable to handle the page fault gracefully.
+ */
+ printk("VM: killing process %s\n", tsk->comm);
+ do_exit(SIGKILL);
+ } else
+ __do_user_fault(tsk, addr, fsr, fault == VM_FAULT_BADACCESS ?
+ SEGV_ACCERR : SEGV_MAPERR, regs);
+ return 0;
+
+
+/*
+ * We ran out of memory, or some other thing happened to us that made
+ * us unable to handle the page fault gracefully.
+ */
+do_sigbus:
+ /*
+ * Send a sigbus, regardless of whether we were in kernel
+ * or user mode.
+ */
+ tsk->thread.address = addr;
+ tsk->thread.error_code = fsr;
+ tsk->thread.trap_no = 14;
+ force_sig(SIGBUS, tsk);
+#ifdef CONFIG_DEBUG_USER
+ if (user_debug & UDBG_BUS) {
+ printk(KERN_DEBUG "%s: sigbus at 0x%08lx, pc=0x%08lx\n",
+ current->comm, addr, instruction_pointer(regs));
+ }
+#endif
+
+ /* Kernel mode? Handle exceptions or die */
+ if (user_mode(regs))
+ return 0;
+
+no_context:
+ __do_kernel_fault(mm, addr, fsr, regs);
+ return 0;
+}
+
+/*
+ * 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.
+ */
+static int
+do_translation_fault(unsigned long addr, unsigned int fsr,
+ struct pt_regs *regs)
+{
+ struct task_struct *tsk;
+ unsigned int index;
+ pgd_t *pgd, *pgd_k;
+ pmd_t *pmd, *pmd_k;
+
+ if (addr < TASK_SIZE)
+ return do_page_fault(addr, fsr, regs);
+
+ 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;
+
+ if (!pgd_present(*pgd))
+ set_pgd(pgd, *pgd_k);
+
+ pmd_k = pmd_offset(pgd_k, addr);
+ pmd = pmd_offset(pgd, addr);
+
+ if (pmd_none(*pmd_k))
+ goto bad_area;
+
+ set_pmd(pmd, *pmd_k);
+ return 0;
+
+bad_area:
+ tsk = current;
+
+ do_bad_area(tsk, tsk->active_mm, addr, fsr, regs);
+ return 0;
+}
+
+/*
+ * 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)
+{
+ struct task_struct *tsk = current;
+ do_bad_area(tsk, tsk->active_mm, addr, fsr, regs);
+ return 0;
+}
+
+/*
+ * This abort handler always returns "fault".
+ */
+static int
+do_bad(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
+{
+ return 1;
+}
+
+static struct fsr_info {
+ int (*fn)(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
+ int sig;
+ const char *name;
+} fsr_info[] = {
+ /*
+ * The following are the standard ARMv3 and ARMv4 aborts. ARMv5
+ * defines these to be "precise" aborts.
+ */
+ { do_bad, SIGSEGV, "vector exception" },
+ { do_bad, SIGILL, "alignment exception" },
+ { do_bad, SIGKILL, "terminal exception" },
+ { do_bad, SIGILL, "alignment exception" },
+ { do_bad, SIGBUS, "external abort on linefetch" },
+ { do_translation_fault, SIGSEGV, "section translation fault" },
+ { do_bad, SIGBUS, "external abort on linefetch" },
+ { do_page_fault, SIGSEGV, "page translation fault" },
+ { do_bad, SIGBUS, "external abort on non-linefetch" },
+ { do_bad, SIGSEGV, "section domain fault" },
+ { do_bad, SIGBUS, "external abort on non-linefetch" },
+ { do_bad, SIGSEGV, "page domain fault" },
+ { do_bad, SIGBUS, "external abort on translation" },
+ { do_sect_fault, SIGSEGV, "section permission fault" },
+ { do_bad, SIGBUS, "external abort on translation" },
+ { do_page_fault, SIGSEGV, "page permission fault" },
+ /*
+ * The following are "imprecise" aborts, which are signalled by bit
+ * 10 of the FSR, and may not be recoverable. These are only
+ * supported if the CPU abort handler supports bit 10.
+ */
+ { do_bad, SIGBUS, "unknown 16" },
+ { do_bad, SIGBUS, "unknown 17" },
+ { do_bad, SIGBUS, "unknown 18" },
+ { do_bad, SIGBUS, "unknown 19" },
+ { do_bad, SIGBUS, "lock abort" }, /* xscale */
+ { do_bad, SIGBUS, "unknown 21" },
+ { do_bad, SIGBUS, "imprecise external abort" }, /* xscale */
+ { do_bad, SIGBUS, "unknown 23" },
+ { do_bad, SIGBUS, "dcache parity error" }, /* xscale */
+ { do_bad, SIGBUS, "unknown 25" },
+ { do_bad, SIGBUS, "unknown 26" },
+ { do_bad, SIGBUS, "unknown 27" },
+ { do_bad, SIGBUS, "unknown 28" },
+ { do_bad, SIGBUS, "unknown 29" },
+ { do_bad, SIGBUS, "unknown 30" },
+ { do_bad, SIGBUS, "unknown 31" }
+};
+
+void __init
+hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
+ int sig, const char *name)
+{
+ if (nr >= 0 && nr < ARRAY_SIZE(fsr_info)) {
+ fsr_info[nr].fn = fn;
+ fsr_info[nr].sig = sig;
+ fsr_info[nr].name = name;
+ }
+}
+
+/*
+ * Dispatch a data abort to the relevant handler.
+ */
+asmlinkage void
+do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
+{
+ const struct fsr_info *inf = fsr_info + (fsr & 15) + ((fsr & (1 << 10)) >> 6);
+
+ if (!inf->fn(addr, fsr, regs))
+ return;
+
+ printk(KERN_ALERT "Unhandled fault: %s (0x%03x) at 0x%08lx\n",
+ inf->name, fsr, addr);
+ force_sig(inf->sig, current);
+ show_pte(current->mm, addr);
+ die_if_kernel("Oops", regs, 0);
+}
+
+asmlinkage void
+do_PrefetchAbort(unsigned long addr, struct pt_regs *regs)
+{
+ do_translation_fault(addr, 0, regs);
+}
+
void show_pte(struct mm_struct *mm, unsigned long addr);
-int do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
-
-int do_translation_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
-
unsigned long search_exception_table(unsigned long addr);
projects / history.git / commitdiff