This series provides the necessary changes to allow "flat" executable binaries meant for no-MMU systems to actually run on systems with a MMU.
*Why?* Because developing and testing natively on a large system with lots of RAM makes it so much more convenient to use all the existing profiling tools and debugging facilities that a kernel with lots of RAM can give. And incidentally, those systems with lots of RAM all have a MMU. *Why not use elf_fdpic?* The flat executable format is simple with very small footprint overhead, either in the executables themselves or kernel support. This makes the flat format more suitable than elf_fdpic for very small single-user-app embedded systems. And while elf_fdpic binaries can run on MMU systems, flat binaries still couldn't, which just felt wrong. So here it is. The no-MMU support should remain unaffected. Tested on ARM only with a busybox build. arch/arm/include/asm/flat.h | 5 +- arch/m68k/include/asm/flat.h | 5 +- arch/sh/include/asm/flat.h | 5 +- arch/xtensa/include/asm/flat.h | 5 +- fs/Kconfig.binfmt | 3 +- fs/binfmt_elf_fdpic.c | 38 +---- fs/binfmt_flat.c | 372 ++++++++++++++++++++++++----------------- fs/exec.c | 33 ++++ include/linux/binfmts.h | 2 + 9 files changed, 274 insertions(+), 194 deletions(-)
