AArch64 Relocations
9.1.3.3 Relocations
Relocations for ‘MOVZ’ and ‘MOVK’ instructions can be generated by prefixing the label with ‘#:abs_g2:’ etc. For example to load the 48-bit absolute address of foo into x0:
movz x0, #:abs_g2:foo // bits 32-47, overflow check movk x0, #:abs_g1_nc:foo // bits 16-31, no overflow check movk x0, #:abs_g0_nc:foo // bits 0-15, no overflow check
Relocations for ‘ADRP’, and ‘ADD’, ‘LDR’ or ‘STR’ instructions can be generated by prefixing the label with ‘:pg_hi21:’ and ‘#:lo12:’ respectively.
For example to use 33-bit (+/-4GB) pc-relative addressing to load the address of foo into x0:
adrp x0, :pg_hi21:foo add x0, x0, #:lo12:foo
Or to load the value of foo into x0:
adrp x0, :pg_hi21:foo ldr x0, [x0, #:lo12:foo]
Note that ‘:pg_hi21:’ is optional.
adrp x0, foo
is equivalent to
adrp x0, :pg_hi21:foo
from:
https://www.rowleydownload.co.uk/arm/documentation/gnu/as/AArch64_002dRelocations.html
reference:
https://developer.arm.com/documentation/100067/0612/armclang-Integrated-Assembler/Assembly-expressions
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