static int
kgdb_get_blocked_state(struct vcpu *p,
struct cpu_user_regs *regs,
struct unw_frame_info *unw)
#endif
{
unsigned long ip;
int count = 0;
#ifndef XEN
unw_init_from_blocked_task(unw, p);
#endif
ip = 0UL;
do {
if (unw_unwind(unw) < 0)
return -1;
unw_get_ip(unw, &ip);
#ifndef XEN
if (!in_sched_functions(ip))
break;
#else
dbg_printk("ip 0x%lx cr_iip 0x%lx\n", ip, regs->cr_iip);
if (ip == regs->cr_iip)
break;
#endif
} while (count++ < 16);
if (!ip)
return -1;
else
return 0;
}
static void
ia64_do_save_stack(struct unw_frame_info *info, void *arg)
{
struct stack_trace *trace = arg;
unsigned long ip;
int skip = trace->skip;
trace->nr_entries = 0;
do {
unw_get_ip(info, &ip);
if (ip == 0)
break;
if (skip == 0) {
trace->entries[trace->nr_entries++] = ip;
if (trace->nr_entries == trace->max_entries)
break;
} else
skip--;
} while (unw_unwind(info) >= 0);
}
static __inline__ int next_frame(ia64_backtrace_t *bt)
{
/*
*/
if (in_ivt_code(bt->frame.ip))
return 0;
/*
*/
if (bt->prev_pfs_loc && bt->regs && bt->frame.pfs_loc == bt->prev_pfs_loc)
bt->frame.pfs_loc = &bt->regs->ar_pfs;
bt->prev_pfs_loc = NULL;
return unw_unwind(&bt->frame) == 0;
}
static __inline__ int next_frame(ia64_backtrace_t *bt)
{
/*
* Avoid unsightly console message from unw_unwind() when attempting
* to unwind through the Interrupt Vector Table which has no unwind
* information.
*/
if (in_ivt_code(bt->frame.ip))
return 0;
/*
* WAR for spinlock contention from leaf functions. ia64_spinlock_contention_pre3_4
* has ar.pfs == r0. Leaf functions do not modify ar.pfs so ar.pfs remains
* as 0, stopping the backtrace. Record the previous ar.pfs when the current
* IP is in ia64_spinlock_contention_pre3_4 then unwind, if pfs_loc has not changed
* after unwind then use pt_regs.ar_pfs which is where the real ar.pfs is for
* leaf functions.
*/
if (bt->prev_pfs_loc && bt->regs && bt->frame.pfs_loc == bt->prev_pfs_loc)
bt->frame.pfs_loc = &bt->regs->ar_pfs;
bt->prev_pfs_loc = NULL;
return unw_unwind(&bt->frame) == 0;
}
