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Restrictions on placing __at sections

The following restrictions apply when placing __at sections at specific addresses:

  • __at section address ranges must not overlap, unless the overlapping sections are placed in different overlay regions

  • __at sections are not permitted in position independent execution regions

  • you must not reference the linker-defined symbols $$Base, $$Limit and $$Length of an __at section

  • __at sections must not be used in System V (SysV) and Base Platform Application Binary Interface (BPABI) executables and BPABI dynamic link libraries (DLLs)

  • __at sections must have an address that is a multiple of their alignment

  • __at sections ignore any +FIRST or +LAST ordering constraints.