as: AArch64-Relocations
9.1.3.3 Relocations
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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
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as: AArch64-Regs
as: AArch64 Syntax