TASKING VX-toolset for ARM User Guide

TASKING VX-toolset for ARM User GuideNote that the built-in function @LSW() must be used on the bitwise negated immediate value becauseall values are interpreted by the assembler as 64-bit signed values. The @LSW() function returns thelowest 32 bits.3.11.3. Thumb 16-bit Generic InstructionsThe ARM assembler recognizes the following generic instructions in Thumb mode:ADR Thumb 16-bit genericLoad a PC-relative address into a low register. The address is specified as a target label. The PC-relativeoffset must be less than 1 kB. The target label must be defined locally, must be word-aligned and mustbe in the same code section as the instruction. The assembler will not emit a relocation type for the targetlabel. If the offset is out-of-range or the target label is external or in another section, then the assemblergenerates an error message.LDR= Thumb 16-bit genericLoad an address or a 32-bit constant value into a low register. If the constant is in the range [0,255] theassembler will generate a MOV instruction. Otherwise the assembler places the constant or the addressin a literal pool and generates a PC-relative LDR instruction that loads the value from the literal pool.InstructionLDR Rd,=exprReplacementMOV Rd, #exprLDR Rd,ltpool;; codeltpool:.DW exprRemarksIf expr is in rangeIf expr is external or PC-relative, or not inrangeThe PC-relative offset from the LDR instruction to the value in the literal pool must be positive and lessthan 1 kB. By default the assembler will place a literal pool at the end of each code section. If the defaultliteral pool is out-of-range you will have to ensure that there is another literal pool within range by meansof the .LTORG directive.Bcond inversion Thumb 16-bit genericThe PC-relative conditional branch instruction has a range of (-256,+255) bytes.The unconditional versionhas a range of (-2048,+2047) bytes. If the conditional branch target is out-of-range, the assembler willrewrite the conditional branch instruction with an inversed conditional branch and an unconditional branch.InstructionBcond labelReplacement~1:Binv_cond ~1B labelRemarksIf target label out-of-range144