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Methods of importing linker-defined symbols in ARM® assembly language
You can import linker-defined symbols into your ARM® assembly code.
To import linker-defined symbols into your assembly language source code,
use the .global
directive.
32-bit applications
Create a 32-bit data word to hold the value of the symbol, for example:
.global Image$$ER_ZI$$Limit … .zi_limit: .word Image$$ER_ZI$$Limit
To load the value into a register, such as r1, use the LDR
instruction:
LDR r1, .zi_limit
The LDR
instruction
must be able to reach the 32-bit data word. The accessible memory range varies between A64,
A32, and T32, and the architecture you are using.
64-bit applications
Create a 64-bit data word to hold the value of the symbol, for example:
.global Image$$ER_ZI$$Limit … .zi_limit: .quad Image$$ER_ZI$$Limit
To load the value into a register, such as x1, use the LDR
instruction:
LDR x1, .zi_limit
The LDR
instruction must be able to reach the 64-bit data word.