The purpose of this series is to implement a fast syscall entry on ppc32, as already done on ppc64.
Unlike all other exceptions which can happen at any time and require to preserve all registers, the syscalls do not require the preservation of volatile registers (except LR). Syscall entries can then be optimised with lighter entry code than the general exception handling. In the meantime this series refactorises the exception entry on 40x/6xx/8xx as they are pretty similar, and it takes benh series on rationalising the settings of MSR_EE at exceptions/syscall entries as this change pretty simplies exception entries. The refactorisation of exception entry will help when it comes to implementing VMAP_STACK On a 8xx, this series improves null_syscall selftest by 17% On a 83xx, this series improves null_syscall selftest by 12,5% v3: - Rebased on latest powerpc/merge branch - Fixed trivial conflict due to KUP functionnality - Dropped patch 15 (already applied) v2: - Rebased on latest powerpc/merge branch. - Added booke support as well (tested on qemu bamboo). - Added a patch to get rid of the dummy frames when calling trace_hardirqs_on/off. Christophe Leroy (16): powerpc/32: Refactor EXCEPTION entry macros for head_8xx.S and head_32.S powerpc/32: move LOAD_MSR_KERNEL() into head_32.h and use it powerpc/32: make the 6xx/8xx EXC_XFER_TEMPLATE() similar to the 40x/booke one powerpc/40x: Don't use SPRN_SPRG_SCRATCH2 in EXCEPTION_PROLOG powerpc/40x: add exception frame marker powerpc/40x: Split and rename NORMAL_EXCEPTION_PROLOG powerpc/40x: Refactor exception entry macros by using head_32.h powerpc/fsl_booke: ensure SPEFloatingPointException() reenables interrupts powerpc/32: enter syscall with MSR_EE inconditionaly set powerpc/32: Enter exceptions with MSR_EE unset powerpc/32: get rid of COPY_EE in exception entry powerpc: Fix 32-bit handling of MSR_EE on exceptions powerpc/32: implement fast entry for syscalls on non BOOKE powerpc/32: implement fast entry for syscalls on BOOKE powerpc/32: don't do syscall stuff in transfer_to_handler powerpc/32: Don't add dummy frames when calling trace_hardirqs_on/off arch/powerpc/kernel/entry_32.S | 153 +++++++++++++------------- arch/powerpc/kernel/head_32.S | 170 +++++++---------------------- arch/powerpc/kernel/head_32.h | 203 +++++++++++++++++++++++++++++++++++ arch/powerpc/kernel/head_40x.S | 152 +++++++------------------- arch/powerpc/kernel/head_44x.S | 9 +- arch/powerpc/kernel/head_8xx.S | 133 ++++------------------- arch/powerpc/kernel/head_booke.h | 131 +++++++++++++++++----- arch/powerpc/kernel/head_fsl_booke.S | 29 +++-- arch/powerpc/kernel/traps.c | 8 ++ 9 files changed, 508 insertions(+), 480 deletions(-) create mode 100644 arch/powerpc/kernel/head_32.h -- 2.13.3