Messages in this thread Patch in this message | | | Date | Wed, 06 Dec 2006 20:07:10 +0900 | From | Hirokazu Takata <> | Subject | [PATCH 2.6.19] m32r: Fix ace_handler to pass full 32-bit address |
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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> --- arch/m32r/kernel/entry.S | 2 -- 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 5b01fd2..a2c472c 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 8d5f551..9b9feb0 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; /* -- 1.4.4.1 -- Hirokazu Takata <takata@linux-m32r.org> Linux/M32R Project: http://www.linux-m32r.org/
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