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Questions - thumb

ldr.w instruction causing unaligned access hardfault on ARM Cortex-M7 with Thumb2

I am getting a unaligned access hardfault on the ldr.w instruction with Thumb2 on ARM Cortex-M7. The microcontroller is an STM32H745xx and I am using STM32CubeIDE. I am using the STM32 arm-eabi-none-g...
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ethorn

arm

stm32

cortex-m

thumb

stm32cubeide

Votes: 0

Answers: 0

how arm-thumb instruction set's blx instruction support 4MB range

Read from https://www.keil.com/support/man/docs/armasm/armasm_dom1361289866046.htm that arm-thumb instruction's blx instruction can support maximum 4MB of jump range. But as far as I know, arm-thumb i...
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user16387400

assembly

arm

machine-code

thumb

instruction-encoding

Votes: 0

Answers: 1

Latest Answer

In the original Thumb instruction set, the BL instruction comprised two 16 bit instructions encoded such: 1111 HOOO OOOO OOOO BL <label> | | | \.. long branch a...
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fuz

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