ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Assembler syntax
where:
Instruction Details
PLI [ {, #+/-}] Immediate form
PLI Normal literal form
PLI [PC, #+/-] Alternative literal form
See Standard assembler syntax fields on page A8-7. An ARM PLI instruction must be
unconditional.
Is the base register. The SP can be used.
+/- Is + or omitted to indicate that the immediate offset is added to the base register value
(add == TRUE), or – to indicate that the offset is to be subtracted (add == FALSE). Different
instructions are generated for #0 and #-0.
The immediate offset used to form the address. For the immediate form of the syntax,
can be omitted, in which case the #0 form of the instruction is assembled. Values are:
Encoding T1, T3, A1 any value in the range 0 to 4095
Encoding T2 any value in the range 0 to 255.
The label of the instruction that is likely to be accessed in the near future. The assembler
calculates the required value of the offset from the Align(PC,4) value of this instruction to
the label. The offset must be in the range –4095 to 4095.
If the offset is zero or positive, imm32 is equal to the offset and add == TRUE.
If the offset is negative, imm32 is equal to minus the offset and add == FALSE.
For the literal forms of the instruction, encoding T3 is used, or Rn is encoded as '1111' in encoding A1, to
indicate that the PC is the base register.
The alternative literal syntax permits the addition or subtraction of the offset and the immediate offset to be
specified separately, including permitting a subtraction of 0 that cannot be specified using the normal
syntax. For more information, see Use of labels in UAL instruction syntax on page A4-5.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
base = if n == 15 then Align(PC,4) else R[n];
address = if add then (base + imm32) else (base - imm32);
Hint_PreloadInstr(address);
Exceptions
None.
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. A8-243