ARM Compiler toolchain Using the Linker - ARM Information Center

Using scatter files
Example 8-25 Position-independent data
LR_1 0x010000 ; The first load region is at 0x010000.
{
ER_RO +0 ; Default ABSOLUTE attribute is inherited from parent. The execution address
; is 0x010000. The code and RO data cannot be moved.
{
* (+RO) ; All the RO sections go here.
}
ER_RW 0x018000 PI ; PI attribute overrides ABSOLUTE
{
* (+RW) ; The RW sections are placed at 0x018000 and they can be moved.
}
ER_ZI +0 ; ER_ZI region placed after ER_RW region.
{
* (+ZI) ; All the ZI sections are placed consecutively here.
}
}
8.39.2 See also
ER_RO, the RO execution region, inherits the ABSOLUTE attribute from the load region LR_1. The
next execution region, ER_RW, is marked as PI. Also, because the ER_ZI region has an offset of +0,
it inherits the PI attribute from the ER_RW region.
Similar scatter-loading descriptions can also be written to correspond to the usage of other
combinations of --ropi and --rwpi with type 2 and type 3 images.
Concepts
Linker Reference:
• About load region descriptions on page 4-5
• Considerations when using a relative address +offset for load regions on page 4-16
• Considerations when using a relative address +offset for execution regions on page 4-17.
Reference
Linker Reference:
• --ro_base=address on page 2-135
• --rw_base=address on page 2-139
• --rwpi on page 2-140
• Load region attributes on page 4-7.
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