From: Hirokazu Takata Date: Fri, 8 Dec 2006 10:35:56 +0000 (-0800) Subject: [PATCH] m32r: fix ace_handler to pass full 32-bit address X-Git-Tag: v2.6.20-rc1~34^2~404 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6b8bd3f4b2e9d0fbfd0e7d75ba1cdc79c6876ecc;p=linux-2.6 [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/m32r/kernel/entry.S b/arch/m32r/kernel/entry.S index 5b01fd2096..a2c472c054 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 8d5f551b57..9b9feb0f16 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; /*