| Harvey Harrison | 6d48583 | 2008-01-30 13:31:41 +0100 | [diff] [blame] | 1 | #include <linux/module.h> |
| 2 | #include <linux/spinlock.h> |
| 3 | #include <asm/uaccess.h> |
| 4 | |
| 5 | |
| 6 | int fixup_exception(struct pt_regs *regs) |
| 7 | { |
| 8 | const struct exception_table_entry *fixup; |
| 9 | |
| 10 | #ifdef CONFIG_PNPBIOS |
| 11 | if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs))) { |
| 12 | extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp; |
| 13 | extern u32 pnp_bios_is_utter_crap; |
| 14 | pnp_bios_is_utter_crap = 1; |
| 15 | printk(KERN_CRIT "PNPBIOS fault.. attempting recovery.\n"); |
| 16 | __asm__ volatile( |
| 17 | "movl %0, %%esp\n\t" |
| 18 | "jmp *%1\n\t" |
| 19 | : : "g" (pnp_bios_fault_esp), "g" (pnp_bios_fault_eip)); |
| 20 | panic("do_trap: can't hit this"); |
| 21 | } |
| 22 | #endif |
| 23 | |
| 24 | fixup = search_exception_tables(regs->ip); |
| 25 | if (fixup) { |
| Hiroshi Shimamoto | fe40c0a | 2009-01-23 15:49:41 -0800 | [diff] [blame] | 26 | /* If fixup is less than 16, it means uaccess error */ |
| 27 | if (fixup->fixup < 16) { |
| Andy Lutomirski | 4fc3490 | 2011-11-07 16:33:40 -0800 | [diff] [blame] | 28 | current_thread_info()->uaccess_err = 1; |
| Hiroshi Shimamoto | fe40c0a | 2009-01-23 15:49:41 -0800 | [diff] [blame] | 29 | regs->ip += fixup->fixup; |
| 30 | return 1; |
| 31 | } |
| Harvey Harrison | 6d48583 | 2008-01-30 13:31:41 +0100 | [diff] [blame] | 32 | regs->ip = fixup->fixup; |
| 33 | return 1; |
| 34 | } |
| 35 | |
| 36 | return 0; |
| 37 | } |
| H. Peter Anvin | 6a1ea27 | 2012-04-19 15:24:20 -0700 | [diff] [blame] | 38 | |
| 39 | /* Restricted version used during very early boot */ |
| 40 | int __init early_fixup_exception(unsigned long *ip) |
| 41 | { |
| 42 | const struct exception_table_entry *fixup; |
| 43 | |
| 44 | fixup = search_exception_tables(*ip); |
| 45 | if (fixup) { |
| 46 | if (fixup->fixup < 16) |
| 47 | return 0; /* Not supported during early boot */ |
| 48 | |
| 49 | *ip = fixup->fixup; |
| 50 | return 1; |
| 51 | } |
| 52 | |
| 53 | return 0; |
| 54 | } |