projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 6d48583b HH |
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) { | |
| fe40c0af HS |
26 | /* If fixup is less than 16, it means uaccess error */ |
| 27 | if (fixup->fixup < 16) { | |
| 4fc34901 | 28 | current_thread_info()->uaccess_err = 1; |
| fe40c0af HS |
29 | regs->ip += fixup->fixup; |
| 30 | return 1; | |
| 31 | } | |
| 6d48583b HH |
32 | regs->ip = fixup->fixup; |
| 33 | return 1; | |
| 34 | } | |
| 35 | ||
| 36 | return 0; | |
| 37 | } | |
| 6a1ea279 PA |
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 | } |