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ARM Compiler armlink User Guide : How to find where a symbol is placed when linking

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.

You can do this with the --keep="section_id" and --symbols options. For example, if object(section) is the section containing the symbol, enter:

armlink --cpu=8-A.32 --keep="object(section)" --symbols s.o --output=s.axf

Note

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

As an example, do the following:

Procedure

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

long long array[10] __attribute__ ((section ("ARRAY")));

int main(void)
{
    return sizeof(array);
}

Compile the source:

armclang --target=arm-arm-none-eabi -march=armv8-a -c s.c -o s.o
Link the object s.o, keeping the ARRAY symbol and displaying the symbols:

armlink --cpu=8-A.32 --keep="s.o(ARRAY)" --map --symbols s.o --output=s.axf

Locate the ARRAY symbol in the output, for example:

...
Execution Region ER_RW (Base: 0x000083a8, Size: 0x00000028, Max: 0xffffffff, ABSOLUTE)

Base Addr    Size         Type   Attr      Idx    E Section Name        Object

0x000083a8   0x00000028   Data   RW            4    ARRAY               s.o

...
Execution Region ER_RW (Base: 0x00008360, Size: 0x00000050, Max: 0xffffffff, ABSOLUTE)

Base Addr    Size         Type   Attr      Idx    E Section Name        Object

0x00008360   0x00000050   Data   RW            3    ARRAY               s.o

This shows that the array is placed in execution region ER_RW.