diff options
Diffstat (limited to 'arch/i386/mm/fault.c')
| -rw-r--r-- | arch/i386/mm/fault.c | 25 |
1 files changed, 8 insertions, 17 deletions
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c index f7279468323..5e17a3f43b4 100644 --- a/arch/i386/mm/fault.c +++ b/arch/i386/mm/fault.c @@ -27,21 +27,24 @@ #include <asm/uaccess.h> #include <asm/desc.h> #include <asm/kdebug.h> +#include <asm/segment.h> extern void die(const char *,struct pt_regs *,long); -#ifdef CONFIG_KPROBES -ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain); +static ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain); + int register_page_fault_notifier(struct notifier_block *nb) { vmalloc_sync_all(); return atomic_notifier_chain_register(¬ify_page_fault_chain, nb); } +EXPORT_SYMBOL_GPL(register_page_fault_notifier); int unregister_page_fault_notifier(struct notifier_block *nb) { return atomic_notifier_chain_unregister(¬ify_page_fault_chain, nb); } +EXPORT_SYMBOL_GPL(unregister_page_fault_notifier); static inline int notify_page_fault(enum die_val val, const char *str, struct pt_regs *regs, long err, int trap, int sig) @@ -55,14 +58,6 @@ static inline int notify_page_fault(enum die_val val, const char *str, }; return atomic_notifier_call_chain(¬ify_page_fault_chain, val, &args); } -#else -static inline int notify_page_fault(enum die_val val, const char *str, - struct pt_regs *regs, long err, int trap, int sig) -{ - return NOTIFY_DONE; -} -#endif - /* * Unlock any spinlocks which will prevent us from getting the @@ -119,10 +114,10 @@ static inline unsigned long get_segment_eip(struct pt_regs *regs, } /* The standard kernel/user address space limit. */ - *eip_limit = (seg & 3) ? USER_DS.seg : KERNEL_DS.seg; + *eip_limit = user_mode(regs) ? USER_DS.seg : KERNEL_DS.seg; /* By far the most common cases. */ - if (likely(seg == __USER_CS || seg == __KERNEL_CS)) + if (likely(SEGMENT_IS_FLAT_CODE(seg))) return eip; /* Check the segment exists, is within the current LDT/GDT size, @@ -436,11 +431,7 @@ good_area: write = 0; switch (error_code & 3) { default: /* 3: write, present */ -#ifdef TEST_VERIFY_AREA - if (regs->cs == KERNEL_CS) - printk("WP fault at %08lx\n", regs->eip); -#endif - /* fall through */ + /* fall through */ case 2: /* write, not present */ if (!(vma->vm_flags & VM_WRITE)) goto bad_area; |