Ensuring 16-bit THUMB Instruction Encoding for Code Execution from SRAM on STM32F103
I'm working on a project where I want to execute code from internal SRAM on an STM32F103 as an exercise. My goal is to write some THUMB assembly by hand, assemble it using
The assembly code I wrote is a simple loop:
Here are the commands I used to assemble and disassemble the code:
The disassembler output is as follows:
My understanding is that THUMB instructions should be 16 bits long, but the disassembler is showing some instructions (like
Why are some of my instructions encoded as 32-bit THUMB-2 instructions, and how can I ensure that the machine code is 16-bit THUMB-only instructions for loading into SRAM?
arm-none-eabi-asmwhreg pc 0x20000000The assembly code I wrote is a simple loop:
Here are the commands I used to assemble and disassemble the code:
The disassembler output is as follows:
My understanding is that THUMB instructions should be 16 bits long, but the disassembler is showing some instructions (like
mov.w r0, #40f04f 0028Why are some of my instructions encoded as 32-bit THUMB-2 instructions, and how can I ensure that the machine code is 16-bit THUMB-only instructions for loading into SRAM?
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