On Fri, 30 May 2014, Aurelien Jarno wrote: > Just a comment, not related to QEMU: while it looks at a first glance to > build a binary that runs on both pre-R6 and R6 by not using the removed > instructions, I do wonder how the transition would be done for unaligned > load/stores. On pre-R6, unaligned load/stores are not supported so > LDR/LDL must be used, while on R6 LDR/LDL are not supported, so > unaligned load/stores should be used instead...
IIUC you just don't. R6 is an incompatible ISA change (one could say just a new ISA that happens to resemble existing ones a bit), so you just have to recompile high-level sources from scratch and rewrite assembly code (here the resemblance helps, you might be able to use the C preprocessor or similar tools to switch between fragments meant for the specific ISAs). Maciej
