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Groups > linux.kernel > #1441744

[PATCH 00/10] allow BFLT executables on systems with a MMU

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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(-)

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[PATCH 00/10] allow BFLT executables on systems with a MMU Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  07/10] binfmt_flat: use clear_user() rather than memset() to clear .bss Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  09/10] binfmt_flat: add MMU-specific support Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  03/10] binfmt_flat: use generic transfer_args_to_stack() Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  05/10] binfmt_flat: use proper user space accessors with relocs processing code Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  01/10] binfmt_flat: assorted cleanups Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  10/10] binfmt_flat: allow compressed flat binary format to work on MMU systems Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  08/10] binfmt_flat: update libraries' data segment pointer with userspace accessors Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  06/10] binfmt_flat: use proper user space accessors with old relocs code Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  02/10] elf_fdpic_transfer_args_to_stack(): make it generic Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200
  [PATCH  04/10] binfmt_flat: clean up create_flat_tables() and stack accesses Nicolas Pitre <nicolas.pitre@linaro.org> - 2016-07-12 23:50 +0200

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