Lock-free programming with LDREX/STREX on ARMv7: A block memory allocator

21 Oct 2025 21:26:47 +0000

In this post, I will demonstrate how to use ARM's LDREX/STREX instructions to write re-entrant thread-safe code without relying on mutexes or disabling interrupts. Along the way, I will write a simple block memory allocator with a run-time adjustable block size and unit-test it under QEMU using ARM semihosting. I will also briefly touch on GCC inline assembly.

Let's write a disassembler for ARMv6 in C

9 Sep 2025 21:43:21 +0000

In this post I will show how to recreate objdump from binutils for Armv6-M. You will not only learn to decode Thumb instructions, but also to understand their semantics and to navigate Arm reference manuals.

Andrei Liungrin

Lock-free programming with LDREX/STREX on ARMv7: A block memory allocator

Let's write a disassembler for ARMv6 in C