Thank you for the suggestions, Martin.
Stack corruption does not appear to be the issue:
(a)Your PINF in [1] yields a run-time error -- "SP <warning: unsupported
format string argument>p". (Not sure why that would be.)
(b) Replacing %p with 0x%x and applying the appropriate cast, results in
PINF showing "SP 0x810893f0".
(c) The kernel_stack$ symbol is set at "81079440 B kernel_stack".
(d )KERNEL_STACK_SIZE = 64 * 1024.
So the stack pointer is appropriately near the top of the stack,
assuming it's growing from top to bottom.
Your suggestion, [4] failed to compile with the following error output:
"//Work/Genode/genode-15.05/repos/base/src/base/include/unmanaged_singleton.h:
In instantiation of ‘T* unmanaged_singleton(ARGS ...) [with T =
Kernel::Core_thread; int ALIGNMENT = 4; ARGS = {}]’://
///Work/Genode/genode-15.05/repos/base-hw/src/core/kernel/thread.cc:805:45:
required from here//
///Work/Genode/genode-15.05/repos/base-hw/src/core/kernel/thread.cc:771:1:
error: ‘Kernel::Core_thread::Core_thread()’ is private//
// Core_thread::Core_thread()//
// ^//
//In file included from
/Work/Genode/genode-15.05/repos/base-hw/src/core/kernel/thread.cc:17:0://
///Work/Genode/genode-15.05/repos/base/src/base/include/unmanaged_singleton.h:69:3:
error: within this context//
// new (&object_space) T(args...);//
// ^/"
Based on Stefan's suggestion however, the CXA guards appear to be
working correctly.
I'll look into your thought about the cpu_id, once I understand its
purpose and use.
I should also note that the thread.cc I'm using contains two additional
methods and associated call case statements I ported from my modified
kernel from an AM335x implementation. Those core-based kernel calls are
necessary in both the 4371 and 335x to allow writing to control
subsystem registers in these platforms. I don't believe these changes
have anything to do with the issue, but it is a difference.
Thanks,
Bob
On 07/02/2015 05:46 AM, Martin Stein wrote:
Hi Bob,
On 01.07.2015 21:42, Bob Stewart wrote:
Once the Core_thread singleton is
created the last printf output that appears is one I inserted after the
call to to _become_active() in the constructor. A printf inserted into
the singleton method after the Core_thread creation never shows up on
the console. The initialization never completes.
This might be caused by a stack corruption. I would check whether the
stack pointer (insert [1] after _become_active()) is inside the
kernel_stack array (constraints via [2]). If the AM437x's hardware
CPU-ID of your CPU is not 0, this might be a problem as this value is
used to index CPU local data like the kernel stack. Another problem
might be the CXA guard stuff that Stefan mentioned. Additional to
Stefans suggestions you can try to prevent CXA guards by replacing [3]
with [4]. This way, you can easily validate the assumption before
digging deeper into it.
Cheers,
Martin
[1]
int i = 0; PINF("SP %p", &i);
[2]
/usr/local/genode-gcc/bin/genode-arm-nm bin/core | grep "kernel_stack$"
grep -r "KERNEL_STACK_SIZE =" base-hw/
[3]
Thread & Core_thread::singleton() {
static Core_thread ct;
return ct; }
[4]
#include <unmanaged_singleton.h>
Thread & Core_thread::singleton() {
return *unmanaged_singleton<Core_thread>(); }
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