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/*
* 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%lx\n", 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%lx\n", 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);
}
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