LTORG

The assembler assembles the current literal pool at the end of every code section. The end of a code section is determined by the AREA directive at the beginning of the following section, or the end of the assembly.

These default literal pools can sometimes be out of range of some LDR, LDFD, and LDFS pseudo-instructions. See LDR ARM pseudo-instruction and LDR Thumb pseudo-instruction for more information. Use LTORG to ensure that a literal pool is assembled within range. Large programs can require several literal pools.

Place LTORG directives after unconditional branches or subroutine return instructions so that the processor does not attempt to execute the constants as instructions.

The assembler word-aligns data in literal pools.

        AREA    Example, CODE, READONLY
start   BL      func1

func1                           ; function body
        ; code
        LDR     r1,=0x55555555  ; => LDR R1, [pc, #offset to Literal Pool 1]
        ; code
        MOV     pc,lr           ; end function
        LTORG                   ; Literal Pool 1 contains literal &55555555.

data    SPACE   4200            ; Clears 4200 bytes of memory, 
                                ; starting at current location.
        END                     ; Default literal pool is empty.