* 2 of the License, or (at your option) any later version.
*/
-#include <linux/config.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
struct mm_struct *mm = current->mm;
siginfo_t info;
int code = SEGV_MAPERR;
+ int fault;
#if defined(CONFIG_4xx) || defined (CONFIG_BOOKE)
int is_write = error_code & ESR_DST;
#else
/* an exec - 4xx/Book-E allows for per-page execute permission */
} else if (TRAP(regs) == 0x400) {
pte_t *ptep;
+ pmd_t *pmdp;
#if 0
/* It would be nice to actually enforce the VM execute
/* Since 4xx/Book-E supports per-page execute permission,
* we lazily flush dcache to icache. */
ptep = NULL;
- if (get_pteptr(mm, address, &ptep) && pte_present(*ptep)) {
- struct page *page = pte_page(*ptep);
-
- if (! test_bit(PG_arch_1, &page->flags)) {
- flush_dcache_icache_page(page);
- set_bit(PG_arch_1, &page->flags);
+ if (get_pteptr(mm, address, &ptep, &pmdp)) {
+ spinlock_t *ptl = pte_lockptr(mm, pmdp);
+ spin_lock(ptl);
+ if (pte_present(*ptep)) {
+ struct page *page = pte_page(*ptep);
+
+ if (!test_bit(PG_arch_1, &page->flags)) {
+ flush_dcache_icache_page(page);
+ set_bit(PG_arch_1, &page->flags);
+ }
+ pte_update(ptep, 0, _PAGE_HWEXEC);
+ _tlbie(address);
+ pte_unmap_unlock(ptep, ptl);
+ up_read(&mm->mmap_sem);
+ return 0;
}
- pte_update(ptep, 0, _PAGE_HWEXEC);
- _tlbie(address);
- pte_unmap(ptep);
- up_read(&mm->mmap_sem);
- return 0;
+ pte_unmap_unlock(ptep, ptl);
}
- if (ptep != NULL)
- pte_unmap(ptep);
#endif
/* a read */
} else {
/* protection fault */
if (error_code & 0x08000000)
goto bad_area;
- if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
+ if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
goto bad_area;
}
* the fault.
*/
survive:
- switch (handle_mm_fault(mm, vma, address, is_write)) {
- case VM_FAULT_MINOR:
- current->min_flt++;
- break;
- case VM_FAULT_MAJOR:
- current->maj_flt++;
- break;
- case VM_FAULT_SIGBUS:
- goto do_sigbus;
- case VM_FAULT_OOM:
- goto out_of_memory;
- default:
+ fault = handle_mm_fault(mm, vma, address, is_write);
+ if (unlikely(fault & VM_FAULT_ERROR)) {
+ if (fault & VM_FAULT_OOM)
+ goto out_of_memory;
+ else if (fault & VM_FAULT_SIGBUS)
+ goto do_sigbus;
BUG();
}
+ if (fault & VM_FAULT_MAJOR)
+ current->maj_flt++;
+ else
+ current->min_flt++;
up_read(&mm->mmap_sem);
/*
*/
out_of_memory:
up_read(&mm->mmap_sem);
- if (current->pid == 1) {
+ 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_exit(SIGKILL);
+ do_group_exit(SIGKILL);
return SIGKILL;
do_sigbus: