Strange problem - RTEMS globals memory offset?
Kenneth J. Peters
Kenneth.J.Peters at jpl.nasa.gov
Fri Jun 15 18:13:10 UTC 2007
I'm observing a strange problem in an system with custom hardware and
a slightly modified sparc BSP (Sparc erc32-based) with RTEMS 4.6.6.
It may not be an RTEMS problem at all, but it is mysterious enough
that I could use some extra ideas.
The basic observations are that the executable image (built from C
code) ends with a bunch of RTEMS global variables (partial symbol
table below, showing which ones). The image size has grown, and we
observe some bad application behavior, that looks rather like some
sort of intermittent IRQ error (missing interrupts, maybe taking too
long to respond or execute, not entirely clear yet). However, I've
determined that changing the linker command file to move the RTEMS
globals a little farther up in memory makes the problem go away.
Moving farther up in memory makes the problem come back. Moving
farther again, the problem goes away.
I have checked that the heap and stack are not colliding, and a
variety of other things (such as the word alignment remaining the
same). My basic question to the list is whether there is some RTEMS
structure that needs to be aligned on a large memory boundary (like
2048 bytes), or needs to be an aligned offset from start of code or
the trap table or something.
Again, this could be some weird hardware issue (though memory tests
pass), not RTEMS at all. But suggestions are welcome.
Thanks,
Ken Peters
Ken.Peters at jpl.nasa.gov
>020977a4 g O .bss 00000028 BSP_RTEMS_Configuration
>020977cc g O .bss 00000004 bsp_isr_level
>020977d0 g O .bss 00000028 Cpu_table
>020977f8 g O .bss 0000003c BSP_Configuration
>02097834 g O .bss 00000004 CPU_SPARC_CLICKS_PER_TICK
>02097838 g O .bss 00000004 rtems_clock_minor
>0209783c g O .bss 00000004 Old_ticker
>02097840 g O .bss 00000004 Clock_driver_ticks
>02097930 g O .bss 00000004 rtems_progname
>02097934 g O .bss 00000004 rtems_panic_in_progress
>02097940 g O .bss 00000004 _IO_Number_of_drivers
>02097944 g O .bss 00000004 _Configuration_MP_table
>02097948 g O .bss 00000004 _TOD_Ticks_per_second
>0209794c g O .bss 00000004 _Thread_Ready_chain
>02097950 g O .bss 00000004 _Thread_Ticks_per_timeslice
>02097954 g O .bss 00000004 _CPU_Interrupt_stack_high
>02097958 g O .bss 00000014 _Objects_Information_table
>02097970 g O .bss 00000088 _Thread_BSP_context
>020979f8 g O .bss 00000004 _Thread_Dispatch_disable_level
>020979fc g O .bss 0000000c _User_extensions_Switches_list
>02097a08 g O .bss 00000004 _CPU_Interrupt_stack_low
>02097a0c g O .bss 00000028 _CPU_Table
>02097a34 g O .bss 00000004 _TOD_Is_set
>02097a38 g O .bss 00000004 _Objects_Maximum_nodes
>02097a3c g O .bss 0000000c _Internal_Objects
>02097a48 g O .bss 0000001c _Workspace_Area
>02097a64 g O .bss 00000004 _ISR_Vector_table
>02097a68 g O .bss 0000004c _Extension_Information
>02097ab4 g O .bss 00000004 _IO_Driver_name_table
>02097ab8 g O .bss 00000004 _Thread_Allocated_fp
>02097abc g O .bss 00000004 _Thread_libc_reent
>02097ac0 g O .bss 00000004 _Thread_Heir
>02097ac4 g O .bss 00000004 _Objects_Local_node
>02097ac8 g O .bss 00000004 _Configuration_Table
>02097acc g O .bss 00000004 _ISR_Nest_level
>02097ad0 g O .bss 00000004 _Thread_Maximum_extensions
>02097ad4 g O .bss 00000004 _Thread_Do_post_task_switch_extension
>02097ad8 g O .bss 00000002 _Priority_Major_bit_map
>02097adc g O .bss 00000004 _RTEMS_Allocator_Mutex
>02097ae0 g O .bss 00000004 _Watchdog_Sync_level
>02097ae4 g O .bss 00000004 _TOD_Seconds_since_epoch
>02097ae8 g O .bss 00000004 _Thread_Executing
>02097aec g O .bss 00000004 _Debug_Level
>02097af0 g O .bss 00000004 _Context_Switch_necessary
>02097af4 g O .bss 0000000c _Watchdog_Seconds_chain
>02097b00 g O .bss 0000000c _Watchdog_Ticks_chain
>02097b0c g O .bss 00000028 _TOD_Seconds_watchdog
>02097b34 g O .bss 00000004 _System_state_Is_multiprocessing
>02097b38 g O .bss 0000004c _API_Mutex_Information
>02097b90 g O .bss 00000020 _Priority_Bit_map
>02097bb0 g O .bss 00000004 _Watchdog_Sync_count
>02097bb4 g O .bss 00000004 _Watchdog_Ticks_since_boot
>02097bb8 g O .bss 00000004 _ISR_Signals_to_thread_executing
>02097bbc g O .bss 0000001c _TOD_Current
>02097bd8 g O .bss 00000004 _IO_Number_of_devices
>02097bdc g O .bss 00000004 rtems_ada_self
>02097be0 g O .bss 0000004c _Thread_Internal_information
>02097c2c g O .bss 00000004 _TOD_Microseconds_per_tick
>02097c30 g O .bss 00000004 _System_state_Current
>02097c34 g O .bss 00000004 _IO_Driver_address_table
>02097c38 g O .bss 00000004 _Thread_Idle
>02097c40 g O .bss 00000088 _CPU_Null_fp_context
>02097cc8 g O .bss 0000000c Internal_errors_What_happened
>02097cd4 g O .bss 0000000c _User_extensions_List
>02097ce0 g O .bss 0000000c _API_extensions_List
>02097cec g O .bss 00000004 rtems_libio_iops
>02097cf0 g O .bss 00000004 rtems_libio_iop_freelist
>02097cf4 g O .bss 00000004 rtems_libio_semaphore
>02097cf8 g O .bss 00000004 RTEMS_Malloc_Heap
>02097cfc g O .bss 00000004 RTEMS_Malloc_Sbrk_amount
>02097d00 g O .bss 0000000c RTEMS_Malloc_GC_list
>02097d10 g O .bss 00000380 libc_global_reent
>02098090 g O .bss 00000004 libc_reentrant
>02098094 g O .bss 0000004c _Region_Information
>020980e0 g O .bss 00000004 _RTEMS_tasks_User_initialization_tasks
>020980e4 g O .bss 0000004c _Timer_Information
>02098130 g O .bss 0000004c _Dual_ported_memory_Information
>0209817c g O .bss 00000028 _RTEMS_Objects
>020981a4 g O .bss 0000004c _Semaphore_Information
>020981f0 g O .bss 0000004c _RTEMS_tasks_Information
>0209823c g O .bss 00000004 _Timer_Server
>02098240 g O .bss 0000004c _Message_queue_Information
>0209828c g O .bss 00000004 _RTEMS_tasks_Number_of_initialization_tasks
>02098290 g O .bss 0000004c _Partition_Information
>020982dc g O .bss 00000004 _Event_Sync_state
>020982e0 g O .bss 0000004c _Rate_monotonic_Information
>0209832c g O .bss 00000004 rtems_termios_ttyMutex
>02098330 g O .bss 00000004 rtems_termios_ttyTail
>02098334 g O .bss 00000004 rtems_termios_ttyHead
>02098338 g O .bss 00000040 rtems_global_user_env
>02098378 g O .bss 0000000c rtems_filesystem_mount_table_control
>02098384 g .bss 00000000 end
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