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authorHirokazu Takata <takata@linux-m32r.org>2006-12-08 02:35:56 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-08 08:28:37 -0800
commit6b8bd3f4b2e9d0fbfd0e7d75ba1cdc79c6876ecc (patch)
tree1bdd60f28f6e10747b19dade59b8e055a69ca75d /arch/m32r
parentf894cb5c938de467e208e5934c90cb9deee7dc46 (diff)
downloadlinux-linaro-stable-6b8bd3f4b2e9d0fbfd0e7d75ba1cdc79c6876ecc.tar.gz
[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.S2
-rw-r--r--arch/m32r/mm/fault.c4
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;
/*