arch/i386/mm/extable.c

   1 /*
   2  * linux/arch/i386/mm/extable.c
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/module.h>
   7 #include <linux/spinlock.h>
   8 #include <asm/uaccess.h>
   9
  10 int fixup_exception(struct pt_regs *regs)
  11 {
  12         const struct exception_table_entry *fixup;
  13
  14 #ifdef CONFIG_PNPBIOS
  15         if (unlikely((regs->xcs & ~15) == (GDT_ENTRY_PNPBIOS_BASE << 3)))
  16         {
  17                 extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp;
  18                 extern u32 pnp_bios_is_utter_crap;
  19                 pnp_bios_is_utter_crap = 1;
  20                 printk(KERN_CRIT "PNPBIOS fault.. attempting recovery.\n");
  21                 __asm__ volatile(
  22                         "movl %0, %%esp\n\t"
  23                         "jmp *%1\n\t"
  24                         : : "g" (pnp_bios_fault_esp), "g" (pnp_bios_fault_eip));
  25                 panic("do_trap: can't hit this");
  26         }
  27 #endif
  28
  29         fixup = search_exception_tables(regs->eip);
  30         if (fixup) {
  31                 regs->eip = fixup->fixup;
  32                 return 1;
  33         }
  34
  35         return 0;
  36 }