[PATCH v4 0/7] Allow platform to handle load/store faults

[Bo Gan]

Sometimes a platform wants to trap-n-emulate special devices or filter
access to physical devices. This patch makes sbi_trap_handler to call
platform_ops.emulate_load/store and ask platform to fixup the fault.

v4 changes:
-  Addressed comments from Anup -- sbi_trap related details should
   not be visable to platform code.
-  Minor fixes -- splitting patches and renames suggested by Anup.

v3 changes:
-  Addressed comments from Anup by breaking down the patchset and
   new sbi_platform_emulate_load/store helper functions.
-  Reworked the return value of sbi_trap_ld/st_emulator to support
   (>0) successful emulation (==0) trap_redirect (<0) real failure.

v2 changes:
-  Added const qualifier to *orig_trap on load/store fault handlers.
   That addressed Xiang W's comment.
-  Applied clang-format to changed lines.

Bo Gan (7):
  lib: sbi: rename sbi_misaligned_ldst.c to sbi_trap_ldst.c
  include: sbi: rename sbi_misaligned_ldst.h to sbi_trap_ldst.h
  lib: sbi: change prototype of sbi_trap_redirect
  lib: sbi: change prototype of sbi_misaligned_load/store_handler
  lib: sbi: abstract out insn decoding to unify mem fault handlers
  include: sbi: add emulate_load/store handler to platform ops
  lib: sbi: call platform load/store emulators

 include/sbi/sbi_misaligned_ldst.h                  |  23 ---
 include/sbi/sbi_platform.h                         |  53 +++++
 include/sbi/sbi_trap.h                             |   2 +-
 include/sbi/sbi_trap_ldst.h                        |  35 ++++
 lib/sbi/objects.mk                                 |   2 +-
 lib/sbi/sbi_trap.c                                 |  38 ++--
 lib/sbi/{sbi_misaligned_ldst.c => sbi_trap_ldst.c} | 213 +++++++++++++++------
 7 files changed, 265 insertions(+), 101 deletions(-)
 delete mode 100644 include/sbi/sbi_misaligned_ldst.h
 create mode 100644 include/sbi/sbi_trap_ldst.h
 rename lib/sbi/{sbi_misaligned_ldst.c => sbi_trap_ldst.c} (54%)

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2.7.4