ip22-berr.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1994, 1995, 1996, 1999, 2000 by Ralf Baechle
- * Copyright (C) 1999, 2000 by Silicon Graphics
- */
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <asm/module.h>
- #include <asm/uaccess.h>
- #include <asm/paccess.h>
- #include <asm/addrspace.h>
- #include <asm/ptrace.h>
- extern asmlinkage void handle_ibe(void);
- extern asmlinkage void handle_dbe(void);
- extern const struct exception_table_entry __start___dbe_table[];
- extern const struct exception_table_entry __stop___dbe_table[];
- static inline unsigned long
- search_one_table(const struct exception_table_entry *first,
- const struct exception_table_entry *last,
- unsigned long value)
- {
- while (first <= last) {
- const struct exception_table_entry *mid;
- long diff;
- mid = (last - first) / 2 + first;
- diff = mid->insn - value;
- if (diff == 0)
- return mid->nextinsn;
- else if (diff < 0)
- first = mid+1;
- else
- last = mid-1;
- }
- return 0;
- }
- extern spinlock_t modlist_lock;
- static inline unsigned long
- search_dbe_table(unsigned long addr)
- {
- unsigned long ret = 0;
- #ifndef CONFIG_MODULES
- /* There is only the kernel to search. */
- ret = search_one_table(__start___dbe_table, __stop___dbe_table-1, addr);
- return ret;
- #else
- unsigned long flags;
- /* The kernel is the last "module" -- no need to treat it special. */
- struct module *mp;
- struct archdata *ap;
- spin_lock_irqsave(&modlist_lock, flags);
- for (mp = module_list; mp != NULL; mp = mp->next) {
- if (!mod_member_present(mp, archdata_end) ||
- !mod_archdata_member_present(mp, struct archdata,
- dbe_table_end))
- continue;
- ap = (struct archdata *)(mod->archdata_start);
- if (ap->dbe_table_start == NULL ||
- !(mp->flags & (MOD_RUNNING | MOD_INITIALIZING)))
- continue;
- ret = search_one_table(ap->dbe_table_start,
- ap->dbe_table_end - 1, addr);
- if (ret)
- break;
- }
- spin_unlock_irqrestore(&modlist_lock, flags);
- return ret;
- #endif
- }
- void do_ibe(struct pt_regs *regs)
- {
- printk("Got ibe at 0x%lxn", regs->cp0_epc);
- show_regs(regs);
- dump_tlb_addr(regs->cp0_epc);
- force_sig(SIGBUS, current);
- while(1);
- }
- void do_dbe(struct pt_regs *regs)
- {
- unsigned long fixup;
- fixup = search_dbe_table(regs->cp0_epc);
- if (fixup) {
- long new_epc;
- new_epc = fixup_exception(dpf_reg, fixup, regs->cp0_epc);
- regs->cp0_epc = new_epc;
- return;
- }
- printk("Got dbe at 0x%lxn", regs->cp0_epc);
- show_regs(regs);
- dump_tlb_all();
- while(1);
- force_sig(SIGBUS, current);
- }
- void __init
- bus_error_init(void)
- {
- int dummy;
- set_except_vector(6, handle_ibe);
- set_except_vector(7, handle_dbe);
- /* At this time nothing uses the DBE protection mechanism on the
- Indy, so this here is needed to make the kernel link. */
- get_dbe(dummy, (int *)KSEG0);
- }