Viewing file:  extable.c (2.15 KB) -rw-r--r--
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/*
* Kernel exception handling table support. Derived from arch/alpha/mm/extable.c.
*
* Copyright (C) 1998, 1999, 2001 Hewlett-Packard Co
* Copyright (C) 1998, 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
*/
#include <linux/config.h>
#include <asm/uaccess.h>
#include <asm/module.h>
extern const struct exception_table_entry __start___ex_table[];
extern const struct exception_table_entry __stop___ex_table[];
static inline const struct exception_table_entry *
search_one_table (const struct exception_table_entry *first,
const struct exception_table_entry *last,
unsigned long ip, unsigned long gp)
{
while (first <= last) {
const struct exception_table_entry *mid;
long diff;
mid = &first[(last - first)/2];
diff = (mid->addr + gp) - ip;
if (diff == 0)
return mid;
else if (diff < 0)
first = mid + 1;
else
last = mid - 1;
}
return 0;
}
#ifndef CONFIG_MODULES
register unsigned long main_gp __asm__("gp");
#endif
struct exception_fixup
search_exception_table (unsigned long addr)
{
const struct exception_table_entry *entry;
struct exception_fixup fix = { 0 };
#ifndef CONFIG_MODULES
/* There is only the kernel to search. */
entry = search_one_table(__start___ex_table, __stop___ex_table - 1, addr, main_gp);
if (entry)
fix.cont = entry->cont + main_gp;
return fix;
#else
struct archdata *archdata;
struct module *mp;
/* The kernel is the last "module" -- no need to treat it special. */
for (mp = module_list; mp ; mp = mp->next) {
if (!mp->ex_table_start)
continue;
archdata = (struct archdata *) mp->archdata_start;
entry = search_one_table(mp->ex_table_start, mp->ex_table_end - 1,
addr, (unsigned long) archdata->gp);
if (entry) {
fix.cont = entry->cont + (unsigned long) archdata->gp;
return fix;
}
}
#endif
return fix;
}
void
handle_exception (struct pt_regs *regs, struct exception_fixup fix)
{
regs->r8 = -EFAULT;
if (fix.cont & 4)
regs->r9 = 0;
regs->cr_iip = (long) fix.cont & ~0xf;
ia64_psr(regs)->ri = fix.cont & 0x3; /* set continuation slot number */
}
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