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How to find where a symbol is placed when linking

To find where a symbol is placed when linking you must find the section that defines the symbol, and ensure that the linker has not removed the section.

To find where a symbol is placed when linking, use the --keep=section_id and --symbols options. For example, if object(section) is the section containing the symbol, enter:

armlink --keep=object(section) --symbols s.o --output=s.axf

Note

You can also run fromelf -s on the resultant image.

Examples

Do the following:

  1. Create the file s.c containing the following source code:

    long long altstack[10] __attribute__ ((section ("STACK"), zero_init));
int main(void)
{
    return sizeof(altstack);
}

  2. Compile the source:

    armcc -c s.c -o s.o

  3. Link the object s.o, keeping the STACK symbol and displaying the symbols:

    armlink --keep=s.o(STACK) --symbols s.o --output=s.axf

  4. Locate the STACK symbol in the output, for example:

    ======================================================================

Image Symbol Table

    Local Symbols

    Symbol Name                        Value     Ov Type        Size  Object(Section)
…
    STACK                              0x00008200   Section       80  s.o(STACK)

    Global Symbols

    Symbol Name                        Value     Ov Type        Size  Object(Section)
…
    altstack                           0x00008200   Data          80  s.o(STACK)
    Image$$ZI$$Limit                   0x00008250   Number         0  s.o(STACK)

    This shows that the stack is placed in the ZI execution region.

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