On 25 September 2013 20:46, Steven Rostedt <rost...@goodmis.org> wrote: > On Wed, 25 Sep 2013 20:12:17 +0530 > Sandeepa Prabhu <sandeepa.pra...@linaro.org> wrote: > > >> > On aarch64, are instructions always word aligned? If not, it should be >> > safe for stop machine to modify non word aligned instructions, but this >> > patch looks like it doesn't allow stop_machine() to do so. >> Steve, >> >> Yes, aarch64 instructions must be word-aligned, else instruction fetch >> would generate Misaligned PC fault. >> > > Thanks for clarifying, as IIUC, there's ARM architectures that allow > for 2 and 4 byte instructions. Yes, ARM 32-bit mode would support both 32-bit and 16-bit alignment based on ARM or Thumb mode, whereas AArch64 (in arch/arm64/) is always 32-bit instructions and PC need to be aligned to 32-bit address.
Thanks, Sandeepa > > -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
