This series allows us to support non-executable stacks on systems with
RIXI by moving delay slot instruction emulation off of the user stack &
into a dedicated page.
This is a revision of patches 6114/6125 & 6115 from a few years back:
https://patchwork.linux-mips.org/patch/6114
https://patchwork.linux-mips.org/patch/6125
https://patchwork.linux-mips.org/patch/6115
The series applies atop v4.7-rc5, and is marked RFC as it could use a
little more testing before I'd be happy with it being merged.
Paul Burton (2):
MIPS: use per-mm page to execute branch delay slot instructions
MIPS: non-exec stack & heap when non-exec PT_GNU_STACK is present
arch/mips/Kconfig | 1 +
arch/mips/include/asm/dsemul.h | 90 +++++++++
arch/mips/include/asm/elf.h | 5 +
arch/mips/include/asm/fpu_emulator.h | 17 +-
arch/mips/include/asm/mmu.h | 11 ++
arch/mips/include/asm/mmu_context.h | 7 +
arch/mips/include/asm/page.h | 6 +-
arch/mips/include/asm/processor.h | 18 +-
arch/mips/kernel/elf.c | 19 ++
arch/mips/kernel/mips-r2-to-r6-emul.c | 8 +-
arch/mips/kernel/process.c | 6 +
arch/mips/kernel/signal.c | 8 +
arch/mips/math-emu/cp1emu.c | 8 +-
arch/mips/math-emu/dsemul.c | 342 +++++++++++++++++++++++-----------
14 files changed, 411 insertions(+), 135 deletions(-)
create mode 100644 arch/mips/include/asm/dsemul.h
--
2.9.0
