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;
}
