summaryrefslogtreecommitdiff
path: root/arch/avr32/mm/fault.c
diff options
context:
space:
mode:
authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/avr32/mm/fault.c
Initial import
Diffstat (limited to 'arch/avr32/mm/fault.c')
-rw-r--r--arch/avr32/mm/fault.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/arch/avr32/mm/fault.c b/arch/avr32/mm/fault.c
new file mode 100644
index 000000000..d223a8b57
--- /dev/null
+++ b/arch/avr32/mm/fault.c
@@ -0,0 +1,268 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * Based on linux/arch/sh/mm/fault.c:
+ * Copyright (C) 1999 Niibe Yutaka
+ *
+ * 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/mm.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/kdebug.h>
+#include <linux/kprobes.h>
+
+#include <asm/mmu_context.h>
+#include <asm/sysreg.h>
+#include <asm/tlb.h>
+#include <asm/uaccess.h>
+
+#ifdef CONFIG_KPROBES
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
+{
+ int ret = 0;
+
+ if (!user_mode(regs)) {
+ if (kprobe_running() && kprobe_fault_handler(regs, trap))
+ ret = 1;
+ }
+
+ return ret;
+}
+#else
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
+{
+ return 0;
+}
+#endif
+
+int exception_trace = 1;
+
+/*
+ * This routine handles page faults. It determines the address and the
+ * problem, and then passes it off to one of the appropriate routines.
+ *
+ * ecr is the Exception Cause Register. Possible values are:
+ * 6: Protection fault (instruction access)
+ * 15: Protection fault (read access)
+ * 16: Protection fault (write access)
+ * 20: Page not found (instruction access)
+ * 24: Page not found (read access)
+ * 28: Page not found (write access)
+ */
+asmlinkage void do_page_fault(unsigned long ecr, struct pt_regs *regs)
+{
+ struct task_struct *tsk;
+ struct mm_struct *mm;
+ struct vm_area_struct *vma;
+ const struct exception_table_entry *fixup;
+ unsigned long address;
+ unsigned long page;
+ long signr;
+ int code;
+ int fault;
+ unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
+
+ if (notify_page_fault(regs, ecr))
+ return;
+
+ address = sysreg_read(TLBEAR);
+
+ tsk = current;
+ mm = tsk->mm;
+
+ signr = SIGSEGV;
+ code = SEGV_MAPERR;
+
+ /*
+ * If we're in an interrupt or have no user context, we must
+ * not take the fault...
+ */
+ if (in_atomic() || !mm || regs->sr & SYSREG_BIT(GM))
+ goto no_context;
+
+ local_irq_enable();
+
+ if (user_mode(regs))
+ 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 (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:
+ code = SEGV_ACCERR;
+
+ switch (ecr) {
+ case ECR_PROTECTION_X:
+ case ECR_TLB_MISS_X:
+ if (!(vma->vm_flags & VM_EXEC))
+ goto bad_area;
+ break;
+ case ECR_PROTECTION_R:
+ case ECR_TLB_MISS_R:
+ if (!(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
+ goto bad_area;
+ break;
+ case ECR_PROTECTION_W:
+ case ECR_TLB_MISS_W:
+ if (!(vma->vm_flags & VM_WRITE))
+ goto bad_area;
+ flags |= FAULT_FLAG_WRITE;
+ break;
+ default:
+ panic("Unhandled case %lu in do_page_fault!", ecr);
+ }
+
+ /*
+ * 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, 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)
+ tsk->maj_flt++;
+ else
+ tsk->min_flt++;
+ if (fault & VM_FAULT_RETRY) {
+ flags &= ~FAULT_FLAG_ALLOW_RETRY;
+ flags |= FAULT_FLAG_TRIED;
+
+ /*
+ * 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);
+
+ if (user_mode(regs)) {
+ if (exception_trace && printk_ratelimit())
+ printk("%s%s[%d]: segfault at %08lx pc %08lx "
+ "sp %08lx ecr %lu\n",
+ is_global_init(tsk) ? KERN_EMERG : KERN_INFO,
+ tsk->comm, tsk->pid, address, regs->pc,
+ regs->sp, ecr);
+ _exception(SIGSEGV, regs, code, address);
+ return;
+ }
+
+no_context:
+ /* 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);
+
+ page = sysreg_read(PTBR);
+ printk(KERN_ALERT "ptbr = %08lx", page);
+ if (address >= TASK_SIZE)
+ page = (unsigned long)swapper_pg_dir;
+ if (page) {
+ page = ((unsigned long *)page)[address >> 22];
+ printk(" pgd = %08lx", page);
+ if (page & _PAGE_PRESENT) {
+ page &= PAGE_MASK;
+ address &= 0x003ff000;
+ page = ((unsigned long *)__va(page))[address >> PAGE_SHIFT];
+ printk(" pte = %08lx", page);
+ }
+ }
+ printk("\n");
+ die("Kernel access of bad area", regs, signr);
+ return;
+
+ /*
+ * 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 */
+ signr = SIGBUS;
+ code = BUS_ADRERR;
+ if (!user_mode(regs))
+ goto no_context;
+
+ if (exception_trace)
+ printk("%s%s[%d]: bus error at %08lx pc %08lx "
+ "sp %08lx ecr %lu\n",
+ is_global_init(tsk) ? KERN_EMERG : KERN_INFO,
+ tsk->comm, tsk->pid, address, regs->pc,
+ regs->sp, ecr);
+
+ _exception(SIGBUS, regs, BUS_ADRERR, address);
+}
+
+asmlinkage void do_bus_error(unsigned long addr, int write_access,
+ struct pt_regs *regs)
+{
+ printk(KERN_ALERT
+ "Bus error at physical address 0x%08lx (%s access)\n",
+ addr, write_access ? "write" : "read");
+ printk(KERN_INFO "DTLB dump:\n");
+ dump_dtlb();
+ die("Bus Error", regs, SIGKILL);
+}