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#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kdb.h>
static struct kdb_bp_support {
unsigned long addr ;
int slot ;
} kdb_bp_info[NR_CPUS] ;
extern void kdb_bp_install (void);
/*
* This gets invoked right before a call to ia64_fault().
* Returns zero the normal fault handler should be invoked.
*/
long
ia64_kdb_fault_handler (unsigned long vector, unsigned long isr, unsigned long ifa,
unsigned long iim, unsigned long itir, unsigned long arg5,
unsigned long arg6, unsigned long arg7, unsigned long stack)
{
struct switch_stack *sw = (struct switch_stack *) &stack;
struct pt_regs *regs = (struct pt_regs *) (sw + 1);
int bundle_slot;
/*
* TBD
* If KDB is configured, enter KDB for any fault.
*/
if ((vector == 29) || (vector == 35) || (vector == 36)) {
if (!user_mode(regs)) {
bundle_slot = ia64_psr(regs)->ri;
if (vector == 29) {
if (bundle_slot == 0) {
kdb_bp_info[0].addr = regs->cr_iip;
kdb_bp_info[0].slot = bundle_slot;
kdb(KDB_REASON_FLTDBG, 0, regs);
} else {
if ((bundle_slot < 3) &&
(kdb_bp_info[0].addr == regs->cr_iip))
{
ia64_psr(regs)->id = 1;
ia64_psr(regs)->db = 1;
kdb_bp_install() ;
} else /* some error ?? */
kdb(KDB_REASON_FLTDBG, 0, regs);
}
} else /* single step or taken branch */
kdb(KDB_REASON_DEBUG, 0, regs);
return 1;
}
}
return 0;
}
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