Since 32-bit constants cannot be encoded in 32-bit opcodes (or 16-bit for The ldr instruction at address 0 then references this value using
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Home > ARM and Thumb Instructions > LDR (immediate offset) Thumb 32-bit encoding, word, halfword, signed halfword, byte, or signed byte, –255 to 4095 6 Apr 2017 Instruction encoding for 16-bit Thumb instructions . 3- . additional variants of the ARM LDR and STR instructions. The additions Figure A3-1 shows the ARM instruction set encoding. All other . LR, PC. ; store the address of the instruction. ; after the next one into R14 ready to return. LDR. What is the real ARM instruction corresponding to the pseudo instruction at label L2? The assembler will turn the pseudo instruction at label L1 (ldr r0, data+4]) Take a deep breath - this is one of the most flexible, and complicated, of the ARM instructions. LDR allows you a way to load a 32 bit word (LDR) or an unsigned Single Data Transfer (LDR, STR). 4-26. 4.10. Halfword instructions should not be used, as their action may change in future ARM implementations. 3. 1 .. The instruction encoding is shown in Figure 4-4: Data processing instructions below. LDR. Load word. 5.7, 5.6, 5.9, 5.11. LDRB. Load byte. 5.7, 5.9. LDRH All instructions in this format have an equivalent ARM instruction as shown in ·Table.The ARM Instruction Set - ARM University Program - V1.0. 1 .. aligned) and stored into the instruction encoding. .. appropriate condition code after STR / LDR. Table B2.1 summarizes the bit encodings for the 32-bit ARM instruction set Appendix B2 ARM and Thumb Instruction Encodings .. LDR Ld, [pc, #immed*4]. 0.
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