[PATCH v3 00/41] powerpc/32: Switch to interrupt entry/exit in C

[Christophe Leroy]

This series aims at porting interrupt entry/exit in C on PPC32, using
the work already merged for PPC64.

First patch is an optimisation around unrecoverable_exception() function.

Six following patches do minimal changes in 40x in order to be able to enable MMU
earlier in exception entry.

Second part of the series prepares and switches interrupt exit in C.

Third part moves more and more things in C, ending with KUAP management.

v3 is tested on 8xx and 83xx and qemu mac99 and qemu bamboo.

Changes in v3:
- Remove the WARN in first patch
- Fix oopses due fast_interrupt_return clobering registers after FPunavailable expection.
- Only call restore_math if PPC64
- Rename C version of kuap_{get_and_}check() into kuap_{get_and_}assert_locked().
- Drop the patch to call bad_page_fault() from do_page_fault() on book3e/64
- Remove the unneeded setting of current->thread.regs on every interrupt entry from user.

Changes in v2:
- Two first patches are new.
- Mainly build fixes, nothing much new.

Christophe Leroy (41):
  powerpc/traps: Declare unrecoverable_exception() as __noreturn
  powerpc/40x: Don't use SPRN_SPRG_SCRATCH0/1 in TLB miss handlers
  powerpc/40x: Change CRITICAL_EXCEPTION_PROLOG macro to a gas macro
  powerpc/40x: Save SRR0/SRR1 and r10/r11 earlier in critical exception
  powerpc/40x: Reorder a few instructions in critical exception prolog
  powerpc/40x: Prepare for enabling MMU in critical exception prolog
  powerpc/40x: Prepare normal exception handler for enabling MMU early
  powerpc/32: Reconcile interrupts in C
  powerpc/32: Entry cpu time accounting in C
  powerpc/32: Handle bookE debugging in C in exception entry
  powerpc/32: Use fast instruction to set MSR RI in exception prolog on
    8xx
  powerpc/32: Remove ksp_limit
  powerpc/32: Always enable data translation in exception prolog
  powerpc/32: Tag DAR in EXCEPTION_PROLOG_2 for the 8xx
  powerpc/32: Enable instruction translation at the same time as data
    translation
  powerpc/32: Statically initialise first emergency context
  powerpc/32: Add vmap_stack_overflow label inside the macro
  powerpc/32: Use START_EXCEPTION() as much as possible
  powerpc/32: Move exception prolog code into .text once MMU is back on
  powerpc/32: Provide a name to exception prolog continuation in virtual
    mode
  powerpc/32: Refactor booke critical registers saving
  powerpc/32: Perform normal function call in exception entry
  powerpc/32: Always save non volatile registers on exception entry
  powerpc/32: Replace ASM exception exit by C exception exit from ppc64
  powerpc/32: Don't save thread.regs on interrupt entry
  powerpc/32: Set regs parameter in r3 in transfer_to_handler
  powerpc/32: Call bad_page_fault() from do_page_fault()
  powerpc/32: Save trap number on stack in exception prolog
  powerpc/32: Add a prepare_transfer_to_handler macro for exception
    prologs
  powerpc/32: Only restore non volatile registers when required
  powerpc/32: Dismantle EXC_XFER_STD/LITE/TEMPLATE
  powerpc/32: Remove the xfer parameter in EXCEPTION() macro
  powerpc/32: Refactor saving of volatile registers in exception prologs
  powerpc/32: Save remaining registers in exception prolog
  powerpc/32: Return directly from power_save_ppc32_restore()
  powerpc/32: Only use prepare_transfer_to_handler function on book3s/32
    and e500
  powerpc/32s: Move KUEP locking/unlocking in C
  powerpc/64s: Make kuap_check_amr() and kuap_get_and_check_amr()
    generic
  powerpc/32s: Create C version of kuap save/restore/check helpers
  powerpc/8xx: Create C version of kuap save/restore/check helpers
  powerpc/32: Manage KUAP in C

 arch/powerpc/include/asm/book3s/32/kup.h     | 126 ++-
 arch/powerpc/include/asm/book3s/64/kup.h     |  24 +-
 arch/powerpc/include/asm/interrupt.h         |  17 +-
 arch/powerpc/include/asm/kup.h               |  27 +-
 arch/powerpc/include/asm/nohash/32/kup-8xx.h |  56 +-
 arch/powerpc/include/asm/ppc_asm.h           |  10 -
 arch/powerpc/include/asm/processor.h         |   6 +-
 arch/powerpc/include/asm/ptrace.h            |   6 +-
 arch/powerpc/kernel/asm-offsets.c            |   4 -
 arch/powerpc/kernel/entry_32.S               | 796 ++++---------------
 arch/powerpc/kernel/fpu.S                    |   2 -
 arch/powerpc/kernel/head_32.h                | 198 ++---
 arch/powerpc/kernel/head_40x.S               | 271 ++++---
 arch/powerpc/kernel/head_44x.S               |  10 +-
 arch/powerpc/kernel/head_8xx.S               | 151 ++--
 arch/powerpc/kernel/head_book3s_32.S         | 233 +++---
 arch/powerpc/kernel/head_booke.h             | 203 +++--
 arch/powerpc/kernel/head_fsl_booke.S         |  64 +-
 arch/powerpc/kernel/idle_6xx.S               |  14 +-
 arch/powerpc/kernel/idle_e500.S              |  14 +-
 arch/powerpc/kernel/interrupt.c              |  41 +-
 arch/powerpc/kernel/irq.c                    |   2 +-
 arch/powerpc/kernel/misc_32.S                |  14 -
 arch/powerpc/kernel/process.c                |   6 +-
 arch/powerpc/kernel/setup_32.c               |   2 +-
 arch/powerpc/kernel/traps.c                  |  14 +-
 arch/powerpc/kernel/vector.S                 |   2 -
 arch/powerpc/lib/sstep.c                     |   9 -
 arch/powerpc/mm/book3s32/Makefile            |   1 +
 arch/powerpc/mm/book3s32/hash_low.S          |  14 -
 arch/powerpc/mm/book3s32/kuep.c              |  38 +
 arch/powerpc/mm/fault.c                      |   2 +-
 32 files changed, 887 insertions(+), 1490 deletions(-)
 create mode 100644 arch/powerpc/mm/book3s32/kuep.c

-- 
2.25.0