My google fu is failing me, but I'm wanting to learn assembly for the Cortex-M series arm devices (Arm v7). I've found example code online for assembly programs, but they dont assemble with the GNU Toolchain. The books I've found on Amazon either don't specify what toolchain, or use a specific one like Keil. Honestly, it feels like the 90s when you got a book that was teaching TASM while you had MASM; technically the content should be the same between the two, but the assemblers did things differently enough that nothing worked the same.
Are there any books out there which teach you ARM assembly through the GNU Toolchain?