__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.