About "Add per-section compilation and linking support" and libdl

[Chris Johns]

On 16/01/2016 2:15 AM, Сергей Круглов wrote:
> I succesfully use libdl with mips processors (R300 with small correct
> resole mips16 relocs).

Do you have a patch for this?

> RTEMS 4.11 and 4.12
> 1. After patch rtems “Add per-section compilation and linking support"
> image size reduce 811400 –> 653864.
> It’s OK, but now rap file generate incorrectly and not load.
> Test program only get and print lists tasks, semaphores, messages, periiods.
> Without per-section compilation symbol map:
>                    size  align offset   
>           .text:   2000     16 0x00000054 (84)
>          .const:    368      0 0x00000824 (2084)
>           .ctor:      0      0 0x00000994 (2452)
>           .dtor:      0      0 0x00000994 (2452)
>           .data:      0     16 0x00000994 (2452)
>            .bss:      0     16 -
>          strtab:     82      - 0x00000994 (2452)
>          symtab:     48      - 0x000009e6 (2534)
>          relocs:   1332      - 0x00000a16 (2582)
> Details: 0x00000020 (32)
> No details
> Strings: 0x00000994 (2452) size: 82
>               0 (0x000000):
>               1 (0x000001): rtems
>               2 (0x000007): _Heap_Get_information
>               3 (0x00001d): _Heap_Iterate
>               4 (0x00002b): _Protected_heap_Get_information
>               5 (0x00004b): rtems
>               6 (0x000051):
> Symbols: 0x000009e6 (2534) size: 48
>                    data section  value      name
>               0: 0x0012    .text 0x00000000 rtems
>               1: 0x0012    .text 0x00000000 _Heap_Get_information
>               2: 0x0012    .text 0x00000000 _Heap_Iterate
>               3: 0x0012    .text 0x00000000 _Protected_heap_Get_information
>  
> With per-section compilation symbol map:
>                    size  align offset   
>           .text:   2404     16 0x00000054 (84)
>          .const:    368      0 0x000009b8 (2488)
>           .ctor:      0      0 0x00000b28 (2856)
>           .dtor:      0      0 0x00000b28 (2856)
>           .data:      4     16 0x00000b28 (2856)
>            .bss:      0     16 -
>          strtab:    156      - 0x00000b2c (2860)
>          symtab:     96      - 0x00000bc8 (3016)
>          relocs:   1488      - 0x00000c28 (3112)
> Details: 0x00000020 (32)
> No details
> Strings: 0x00000b2c (2860) size: 156
>               0 (0x000000):
>               1 (0x000001): rtems
>               2 (0x000007): rtems_object_get_name
>               3 (0x00001d): _Heap_Get_information
>               4 (0x000033): _Heap_Iterate
>               5 (0x000041): _Objects_Get_name_as_string
>               6 (0x00005d): _Protected_heap_Get_information
>               7 (0x00007d): putchar
>               8 (0x000085): BSP_output_char
>               9 (0x000095): rtems
>              10 (0x00009b):
> Symbols: 0x00000bc8 (3016) size: 96
>                    data section  value      name
>               0: 0x0012    .text 0x00000000 rtems
>               1: 0x0012    .text 0x00000000 rtems_object_get_name
>               2: 0x0012    .text 0x00000000 _Heap_Get_information
>               3: 0x0012    .text 0x00000000 _Heap_Iterate
>               4: 0x0012    .text 0x00000000 _Objects_Get_name_as_string
>               5: 0x0012    .text 0x00000000 _Protected_heap_Get_information
>               6: 0x0012    .text 0x00000000 putchar
>               7: 0x0011    .data 0x00000000 BSP_output_char
>  
> Dynamic loader say: Duplicate symbol BSP_output_char
> and stop loading.

This is strange. I suspect a bug has been triggered.

>  
> 2. Also after allocate .bss section it not zeroed and static
> uninitialized symbols have undefined value.
>   In standart linker bss section zeroed in startup procedure.
>   May be need memset after allocate bss section?
>  

I suspect the bug is causing the same problem.

Can you please raise a ticket in Trac and document the configure command
line for RTEMS plus attach an example main for RTEMS, the app code and a
script to build them. I can then take a closer look.

Thanks
Chris