adr

Form PC-relative Address

ADR <Xd>, <label>

Calculates the address of a label (PC +/- 1MB range).

Pseudocode Operation

Xd ← PC + SignExtend(immhi:immlo, 21)

Example

ADR x0, label

Encoding

Binary Layout

0

31

immlo

30:29

10000

28:24

immhi

23:5

Rd

4:0

 

Format PC-rel

Opcode 0x10000000

Extension Base

Operands

• Xd
  Destination 64-bit integer register
• label
  Label

Related

Other forms of adr

• adr Form PC-relative Address (Thumb)
• adr Form PC-relative Address (A32)

More in Base

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x10000000	ADR <Xd>, <label>		A64		0 | immlo | 10000 | immhi | Rd
0x04A0A000	ADR <Zd>.<T>, [<Zn>.<T>, <Zm>.<T>{, <mod> <amount>}]		A64		00000100 | 1 | sz | 1 | Zm | 1010 | msz | Zn | Zd
0x0420A000	ADR <Zd>.D, [<Zn>.D, <Zm>.D, SXTW{ <amount>}]		A64		00000100 | 0 | 0 | 1 | Zm | 1010 | msz | Zn | Zd
0x0460A000	ADR <Zd>.D, [<Zn>.D, <Zm>.D, UXTW{ <amount>}]		A64		00000100 | 0 | 1 | 1 | Zm | 1010 | msz | Zn | Zd

Description

Form PC-relative address adds an immediate value to the PC value to form a PC-relative address, and writes the result to the destination register.

Operation

X[d, 64] = PC64 + imm;