ARM: stacktrace: include exception PC value in stacktrace output
When we unwind through an exception stack, include the saved PC value
into the stack trace: this fills in an otherwise missed functions from
the trace (as indicated below):
[<
c03f4424>] fec_enet_interrupt+0xa0/0xe8
[<
c0066c0c>] handle_irq_event_percpu+0x68/0x228
[<
c0066e18>] handle_irq_event+0x4c/0x6c
[<
c006a024>] handle_fasteoi_irq+0xac/0x198
[<
c00664b0>] generic_handle_irq+0x4c/0x60
[<
c000f014>] handle_IRQ+0x40/0x98
[<
c0008554>] gic_handle_irq+0x30/0x64
[<
c0012900>] __irq_svc+0x40/0x50
[<
c0029030>] __do_softirq+0xe0/0x2fc <====
[<
c0029500>] irq_exit+0xb0/0x100
[<
c000f018>] handle_IRQ+0x44/0x98
[<
c0008554>] gic_handle_irq+0x30/0x64
[<
c0012900>] __irq_svc+0x40/0x50
[<
c000f34c>] arch_cpu_idle+0x30/0x38 <====
[<
c005e1e4>] cpu_startup_entry+0xac/0x214
[<
c066297c>] rest_init+0x68/0x80
[<
c08ccb10>] start_kernel+0x2fc/0x358
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>