diff options
| author | Hirokazu Takata <takata@linux-m32r.org> | 2006-12-08 02:35:56 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-08 08:28:37 -0800 |
| commit | 6b8bd3f4b2e9d0fbfd0e7d75ba1cdc79c6876ecc (patch) | |
| tree | 1bdd60f28f6e10747b19dade59b8e055a69ca75d /arch/m32r | |
| parent | f894cb5c938de467e208e5934c90cb9deee7dc46 (diff) | |
[PATCH] m32r: fix ace_handler to pass full 32-bit address
Don't mask the lower 12-bit of the page fault address.
In the current m32r kernel implementation, we use an access exception
to detect page faults.
This patch fixes ace_handler (access exception handler) for m32r. In order to
check userspace address in do_page_fault, we have to pass full 32-bit address
to do_page_fault.
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/m32r')
| -rw-r--r-- | arch/m32r/kernel/entry.S | 2 | ||||
| -rw-r--r-- | arch/m32r/mm/fault.c | 4 |
2 files changed, 2 insertions, 4 deletions
diff --git a/arch/m32r/kernel/entry.S b/arch/m32r/kernel/entry.S index 5b01fd2096fc..a2c472c0549f 100644 --- a/arch/m32r/kernel/entry.S +++ b/arch/m32r/kernel/entry.S @@ -596,8 +596,6 @@ ENTRY(ace_handler) beqz r1, inst oprand: ld r2, @(low(MDEVA_offset),r2) ; set address - srli r2, #12 - slli r2, #12 srli r1, #1 bra 1f inst: diff --git a/arch/m32r/mm/fault.c b/arch/m32r/mm/fault.c index 8d5f551b5754..9b9feb0f1610 100644 --- a/arch/m32r/mm/fault.c +++ b/arch/m32r/mm/fault.c @@ -173,7 +173,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, goto good_area; if (!(vma->vm_flags & VM_GROWSDOWN)) goto bad_area; -#if 0 + if (error_code & ACE_USERMODE) { /* * accessing the stack below "spu" is always a bug. @@ -184,7 +184,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long error_code, if (address + 4 < regs->spu) goto bad_area; } -#endif + if (expand_stack(vma, address)) goto bad_area; /* |