On Tue, Jun 13, 2017 at 6:10 PM, Denis Obrezkov <denisobrez...@gmail.com> wrote:
> 2017-06-12 23:10 GMT+03:00 Hesham Almatary <heshamelmat...@gmail.com>: > >> >> >> On Tue, Jun 13, 2017 at 2:09 AM, Denis Obrezkov <denisobrez...@gmail.com> >> wrote: >> > Hello all, >> > >> > I was able to debug my program on top of HiFive1 board. >> > I found out that I can't use next and until commands from gdb, >> > they just hang gdb. >> > And now I have a problem, this is my backtrace: >> > >> > #0 0x2041d728 in _User_extensions_Iterate (arg=0x80002eb8, >> > visitor=0x2041d64e <_User_extensions_Fatal_visitor>, >> > direction=CHAIN_ITERATOR_FORWARD) >> > at >> > /home/reprofy/Projects/riscv/rtems/development/rtems/kernel/ >> rtems-riscv/c/src/../../cpukit/score/src/userextiterate.c:155 >> > #1 0x20410ed4 in _User_extensions_Fatal (source=INTERNAL_ERROR_CORE, >> > error=2) at >> > ../../cpukit/../../../hifive1/lib/include/rtems/score/userextimpl.h:307 >> > #2 0x20410ef8 in _Terminate (the_source=INTERNAL_ERROR_CORE, >> the_error=2) >> > at >> > /home/reprofy/Projects/riscv/rtems/development/rtems/kernel/ >> rtems-riscv/c/src/../../cpukit/score/src/interr.c:35 >> > #3 0x20410f40 in _Internal_error >> > (core_error=INTERNAL_ERROR_TOO_LITTLE_WORKSPACE) at >> > /home/reprofy/Projects/riscv/rtems/development/rtems/kernel/ >> rtems-riscv/c/src/../../cpukit/score/src/interr.c:44 >> > #4 0x2041e484 in _Workspace_Handler_initialization (areas=0x80002f78, >> > area_count=1, extend=0x0) at >> > /home/reprofy/Projects/riscv/rtems/development/rtems/kernel/ >> rtems-riscv/c/src/../../cpukit/score/src/wkspace.c:123 >> > #5 0x2040031c in bsp_work_area_initialize_default >> (area_begin=0x80001d58, >> > area_size=8872) at >> > ../../../../../.././hifive1/lib/include/bsp/bootcard.h:147 >> > #6 0x20400372 in bsp_work_area_initialize () at >> > /home/reprofy/Projects/riscv/rtems/development/rtems/kernel/ >> rtems-riscv/c/src/lib/libbsp/riscv32/hifive1/../../shared/ >> bspgetworkarea.c:61 >> > #7 0x2040f3ce in rtems_initialize_executive () at >> > /home/reprofy/Projects/riscv/rtems/development/rtems/kernel/ >> rtems-riscv/c/src/../../cpukit/sapi/src/exinit.c:95 >> > #8 0x204002cc in boot_card (cmdline=0x0) at >> > /home/reprofy/Projects/riscv/rtems/development/rtems/kernel/ >> rtems-riscv/c/src/lib/libbsp/riscv32/hifive1/../../shared/bootcard.c:76 >> > #9 0x20400064 in _end_clear_bss () at >> > /home/reprofy/Projects/riscv/rtems/development/rtems/kernel/ >> rtems-riscv/c/src/lib/libbsp/riscv32/hifive1/start/start.S:116 >> > >> > So, I think I should increase a workspace. >> > Now, I have some questions: >> > I took Hesham's linker file for riscv-generic, and there were no stack >> > space, >> > I allocated 0x1000 for stack. Should I make it zero again, or should I >> > decrease its size? >> > what size for stack should be enough? >> >>> /* >>> * The stack section will occupy the remaining >>> REGION_STACK region and may >>> * contain the task stacks. Depending on the region >>> distribution this >>> * section may be of zero size. >>> */ >>> >> This means that the stack_end address is starting at your very top >> address space (i.e. 16KiB if you set your linker size to 16KiB). The stack >> grows dynamically downwards, so it might overflow other sections (e.g. >> work, heap, data, etc) if you don't have enough memory size to fit. You can >> try to see how much size each section occupies (riscv32-rtems4.12-objdump >> -h hello.exe), especially work space. >> >> >> > And why there were no space for stack? is it possible to work without >> stack >> > allocated in >> > linkcmd file? >> > Can RTEMS work with a smaller workspace? >> > >> As far as I remember, 4KiB was the smallest I could allocate for >> workspace to work (with Epiphany). As I suggested before, you might want to >> start saving up memory by using the local instruction memory (on HiFive) >> and compressed version of RISC-V ISA. >> >> > -- >> > Regards, Denis Obrezkov >> >> >> >> -- >> Hesha >> > I think that problem is that my bss section spends 0x1440 byte. > And rtems requires its workspace to be about 15 KiB. > (I have an error in wkspace.c:137 - 'remaining' is 7024 during the error). > > And I am not sure is it possible to store bss in ITIM, > details can be found in E31 Coreplex manual, 3.1. > I've tried to push bss to ITIM, but I had errors during clearing it. > > I don't think ITIM is supposed to be used for data, rather, it's for instructions only. > Do you think compressed ISA will help? or, how can we reduce the size of > the required space? > > > -- > Regards, Denis Obrezkov > -- Hesham
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