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#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
int fixup_exception(struct pt_regs *regs)
{
const struct exception_table_entry *fixup;
#ifdef CONFIG_PNPBIOS
if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs))) {
extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp;
extern u32 pnp_bios_is_utter_crap;
pnp_bios_is_utter_crap = 1;
printk(KERN_CRIT "PNPBIOS fault.. attempting recovery.\n");
__asm__ volatile(
"movl %0, %%esp\n\t"
"jmp *%1\n\t"
: : "g" (pnp_bios_fault_esp), "g" (pnp_bios_fault_eip));
panic("do_trap: can't hit this");
}
#endif
fixup = search_exception_tables(regs->ip);
if (fixup) {
/* If fixup is less than 16, it means uaccess error */
if (fixup->fixup < 16) {
current_thread_info()->uaccess_err = 1;
regs->ip += fixup->fixup;
return 1;
}
regs->ip = fixup->fixup;
return 1;
}
return 0;
}
/* Restricted version used during very early boot */
int __init early_fixup_exception(unsigned long *ip)
{
const struct exception_table_entry *fixup;
fixup = search_exception_tables(*ip);
if (fixup) {
if (fixup->fixup < 16)
return 0; /* Not supported during early boot */
*ip = fixup->fixup;
return 1;
}
return 0;
}
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