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ARM Linker Address Map

Senthil Ramakrishnan
Note: This was originally posted on 22nd November 2009 at http://forums.arm.com

Hi All,

Im new to this forum and pretty new to ARM development.
When Im compiling my SW in THumb mode the symbol names
in .map file shows Unaligned memory addresses(Eg: 0x225571).
But the symbol is actually placed in address aligned address(0x225570).
Can anybody explain why linker map shows unaligned address?

Thanks
Parents
  • Arm Employee Badge
    Note: This was originally posted on 24th November 2009 at http://forums.arm.com

    > Is this the reason I see the symbol addresses in non-aligned addresses in Linker address map and in my debugger when I examine the memory, functions are all in aligned addresses

    Yes.

    For symbols in the linker view it is best if you view bits 31:1 as the address and bit 0 at a flag indicating "is in thumb".
Reply
  • Arm Employee Badge
    Note: This was originally posted on 24th November 2009 at http://forums.arm.com

    > Is this the reason I see the symbol addresses in non-aligned addresses in Linker address map and in my debugger when I examine the memory, functions are all in aligned addresses

    Yes.

    For symbols in the linker view it is best if you view bits 31:1 as the address and bit 0 at a flag indicating "is in thumb".
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