#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
+#include <linux/mmiotrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/smp.h>
#define PF_RSVD (1<<3)
#define PF_INSTR (1<<4)
-#ifdef CONFIG_PAGE_FAULT_HANDLERS
-static HLIST_HEAD(pf_handlers); /* protected by RCU */
-static DEFINE_SPINLOCK(pf_handlers_writer);
-
-void register_page_fault_handler(struct pf_handler *new_pfh)
+static inline int kmmio_fault(struct pt_regs *regs, unsigned long addr)
{
- unsigned long flags;
- spin_lock_irqsave(&pf_handlers_writer, flags);
- hlist_add_head_rcu(&new_pfh->hlist, &pf_handlers);
- spin_unlock_irqrestore(&pf_handlers_writer, flags);
-}
-EXPORT_SYMBOL_GPL(register_page_fault_handler);
-
-/**
- * unregister_page_fault_handler:
- * The caller must ensure @old_pfh is not in use anymore before freeing it.
- * This function does not guarantee it. The list of handlers is protected by
- * RCU, so you can do this by e.g. calling synchronize_rcu().
- */
-void unregister_page_fault_handler(struct pf_handler *old_pfh)
-{
- unsigned long flags;
- spin_lock_irqsave(&pf_handlers_writer, flags);
- hlist_del_rcu(&old_pfh->hlist);
- spin_unlock_irqrestore(&pf_handlers_writer, flags);
-}
-EXPORT_SYMBOL_GPL(unregister_page_fault_handler);
+#ifdef CONFIG_MMIOTRACE_HOOKS
+ if (unlikely(is_kmmio_active()))
+ if (kmmio_handler(regs, addr) == 1)
+ return -1;
#endif
-
-/* returns non-zero if do_page_fault() should return */
-static int handle_custom_pf(struct pt_regs *regs, unsigned long error_code,
- unsigned long address)
-{
-#ifdef CONFIG_PAGE_FAULT_HANDLERS
- int ret = 0;
- struct pf_handler *cur;
- struct hlist_node *ncur;
-
- if (hlist_empty(&pf_handlers))
- return 0;
-
- rcu_read_lock();
- hlist_for_each_entry_rcu(cur, ncur, &pf_handlers, hlist) {
- ret = cur->handler(regs, error_code, address);
- if (ret)
- break;
- }
- rcu_read_unlock();
- return ret;
-#else
return 0;
-#endif
}
static inline int notify_page_fault(struct pt_regs *regs)
int ret = 0;
/* kprobe_running() needs smp_processor_id() */
-#ifdef CONFIG_X86_32
if (!user_mode_vm(regs)) {
-#else
- if (!user_mode(regs)) {
-#endif
preempt_disable();
if (kprobe_running() && kprobe_fault_handler(regs, 14))
ret = 1;
printk(KERN_CONT "NULL pointer dereference");
else
printk(KERN_CONT "paging request");
-#ifdef CONFIG_X86_32
- printk(KERN_CONT " at %08lx\n", address);
-#else
- printk(KERN_CONT " at %016lx\n", address);
-#endif
+ printk(KERN_CONT " at %p\n", (void *) address);
printk(KERN_ALERT "IP:");
printk_address(regs->ip, 1);
dump_pagetable(address);
if (notify_page_fault(regs))
return;
- if (handle_custom_pf(regs, error_code, address))
+ if (unlikely(kmmio_fault(regs, address)))
return;
/*
if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
printk_ratelimit()) {
printk(
-#ifdef CONFIG_X86_32
- "%s%s[%d]: segfault at %lx ip %08lx sp %08lx error %lx",
-#else
- "%s%s[%d]: segfault at %lx ip %lx sp %lx error %lx",
-#endif
+ "%s%s[%d]: segfault at %lx ip %p sp %p error %lx",
task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
- tsk->comm, task_pid_nr(tsk), address, regs->ip,
- regs->sp, error_code);
+ tsk->comm, task_pid_nr(tsk), address,
+ (void *) regs->ip, (void *) regs->sp, error_code);
print_vma_addr(" in ", regs->ip);
printk("\n");
}
void vmalloc_sync_all(void)
{
#ifdef CONFIG_X86_32
- /*
- * Note that races in the updates of insync and start aren't
- * problematic: insync can only get set bits added, and updates to
- * start are only improving performance (without affecting correctness
- * if undone).
- */
- static DECLARE_BITMAP(insync, PTRS_PER_PGD);
- static unsigned long start = TASK_SIZE;
+ unsigned long start = VMALLOC_START & PGDIR_MASK;
unsigned long address;
if (SHARED_KERNEL_PMD)
BUILD_BUG_ON(TASK_SIZE & ~PGDIR_MASK);
for (address = start; address >= TASK_SIZE; address += PGDIR_SIZE) {
- if (!test_bit(pgd_index(address), insync)) {
- unsigned long flags;
- struct page *page;
-
- spin_lock_irqsave(&pgd_lock, flags);
- list_for_each_entry(page, &pgd_list, lru) {
- if (!vmalloc_sync_one(page_address(page),
- address))
- break;
- }
- spin_unlock_irqrestore(&pgd_lock, flags);
- if (!page)
- set_bit(pgd_index(address), insync);
+ unsigned long flags;
+ struct page *page;
+
+ spin_lock_irqsave(&pgd_lock, flags);
+ list_for_each_entry(page, &pgd_list, lru) {
+ if (!vmalloc_sync_one(page_address(page),
+ address))
+ break;
}
- if (address == start && test_bit(pgd_index(address), insync))
- start = address + PGDIR_SIZE;
+ spin_unlock_irqrestore(&pgd_lock, flags);
}
#else /* CONFIG_X86_64 */
- /*
- * Note that races in the updates of insync and start aren't
- * problematic: insync can only get set bits added, and updates to
- * start are only improving performance (without affecting correctness
- * if undone).
- */
- static DECLARE_BITMAP(insync, PTRS_PER_PGD);
- static unsigned long start = VMALLOC_START & PGDIR_MASK;
+ unsigned long start = VMALLOC_START & PGDIR_MASK;
unsigned long address;
for (address = start; address <= VMALLOC_END; address += PGDIR_SIZE) {
- if (!test_bit(pgd_index(address), insync)) {
- const pgd_t *pgd_ref = pgd_offset_k(address);
- unsigned long flags;
- struct page *page;
-
- if (pgd_none(*pgd_ref))
- continue;
- spin_lock_irqsave(&pgd_lock, flags);
- list_for_each_entry(page, &pgd_list, lru) {
- pgd_t *pgd;
- pgd = (pgd_t *)page_address(page) + pgd_index(address);
- if (pgd_none(*pgd))
- set_pgd(pgd, *pgd_ref);
- else
- BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
- }
- spin_unlock_irqrestore(&pgd_lock, flags);
- set_bit(pgd_index(address), insync);
+ const pgd_t *pgd_ref = pgd_offset_k(address);
+ unsigned long flags;
+ struct page *page;
+
+ if (pgd_none(*pgd_ref))
+ continue;
+ spin_lock_irqsave(&pgd_lock, flags);
+ list_for_each_entry(page, &pgd_list, lru) {
+ pgd_t *pgd;
+ pgd = (pgd_t *)page_address(page) + pgd_index(address);
+ if (pgd_none(*pgd))
+ set_pgd(pgd, *pgd_ref);
+ else
+ BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
}
- if (address == start)
- start = address + PGDIR_SIZE;
+ spin_unlock_irqrestore(&pgd_lock, flags);
}
#endif
}
projects / linux-2.6 / blobdiff