On Fri, Aug 12, 2016 at 7:29 AM, Josh Poimboeuf <jpoim...@redhat.com> wrote: > Now that we can find pt_regs registers on the stack, print them. Here's > an example of what it looks like: > > Call Trace: > <IRQ> > [<ffffffff8144b793>] dump_stack+0x86/0xc3 > [<ffffffff81142c73>] hrtimer_interrupt+0xb3/0x1c0 > [<ffffffff8105eb86>] local_apic_timer_interrupt+0x36/0x60 > [<ffffffff818b27cd>] smp_apic_timer_interrupt+0x3d/0x50 > [<ffffffff818b06ee>] apic_timer_interrupt+0x9e/0xb0 > RIP: 0010:[<ffffffff818aef43>] [<ffffffff818aef43>] > _raw_spin_unlock_irq+0x33/0x60 > RSP: 0018:ffff880079c4f760 EFLAGS: 00000202 > RAX: ffff880078738000 RBX: ffff88007d3da0c0 RCX: 0000000000000007 > RDX: 0000000000006d78 RSI: ffff8800787388f0 RDI: ffff880078738000 > RBP: ffff880079c4f768 R08: 0000002199088f38 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff81e0d540 > R13: ffff8800369fb700 R14: 0000000000000000 R15: ffff880078738000 > <EOI> > [<ffffffff810e1f14>] finish_task_switch+0xb4/0x250 > [<ffffffff810e1ed6>] ? finish_task_switch+0x76/0x250 > [<ffffffff818a7b61>] __schedule+0x3e1/0xb20 > ... > [<ffffffff810759c8>] trace_do_page_fault+0x58/0x2c0 > [<ffffffff8106f7dc>] do_async_page_fault+0x2c/0xa0 > [<ffffffff818b1dd8>] async_page_fault+0x28/0x30 > RIP: 0010:[<ffffffff8145b062>] [<ffffffff8145b062>] __clear_user+0x42/0x70 > RSP: 0018:ffff880079c4fd38 EFLAGS: 00010202 > RAX: 0000000000000000 RBX: 0000000000000138 RCX: 0000000000000138 > RDX: 0000000000000000 RSI: 0000000000000008 RDI: 000000000061b640 > RBP: ffff880079c4fd48 R08: 0000002198feefd7 R09: ffffffff82a40928 > R10: 0000000000000001 R11: 0000000000000000 R12: 000000000061b640 > R13: 0000000000000000 R14: ffff880079c50000 R15: ffff8800791d7400 > [<ffffffff8145b043>] ? __clear_user+0x23/0x70 > [<ffffffff8145b0fb>] clear_user+0x2b/0x40 > [<ffffffff812fbda2>] load_elf_binary+0x1472/0x1750 > [<ffffffff8129a591>] search_binary_handler+0xa1/0x200 > [<ffffffff8129b69b>] do_execveat_common.isra.36+0x6cb/0x9f0 > [<ffffffff8129b5f3>] ? do_execveat_common.isra.36+0x623/0x9f0 > [<ffffffff8129bcaa>] SyS_execve+0x3a/0x50 > [<ffffffff81003f5c>] do_syscall_64+0x6c/0x1e0 > [<ffffffff818afa3f>] entry_SYSCALL64_slow_path+0x25/0x25 > RIP: 0033:[<00007fd2e2f2e537>] [<00007fd2e2f2e537>] 0x7fd2e2f2e537 > RSP: 002b:00007ffc449c5fc8 EFLAGS: 00000246 > RAX: ffffffffffffffda RBX: 00007ffc449c8860 RCX: 00007fd2e2f2e537 > RDX: 000000000127cc40 RSI: 00007ffc449c8860 RDI: 00007ffc449c6029 > RBP: 00007ffc449c60b0 R08: 65726f632d667265 R09: 00007ffc449c5e20 > R10: 00000000000005a7 R11: 0000000000000246 R12: 000000000127cc40 > R13: 000000000127ce05 R14: 00007ffc449c6029 R15: 000000000127ce01
I really like this, and I think it'll be quite useful for future debugging. Some day I want to teach this thing to print gsbase as well, but it's not quite obvious to me how to do that except maybe by using DWARF and a lot of special case code. --Andy
