target/xtensa: switch to libisa

Hello,

this series adds libisa to the Xtensa target, changes decoder and instruction translators to use it, switches existing xtensa cores to use it, adds support for a number of new instructions and adds disassembler for Xtensa.

Libisa is the canonical way of dealing with Xtensa instructions decoding and encoding. Libisa is a configuration-independent library with a stable interface plus generated configuration-specific xtensa-modules.c file with implementations of decoding and encoding functions. Libisa is MIT-licensed and originally distributed xtensa-modules.c files are also MIT-licensed and are available as a part of the xtensa configuration overlay.

This transition makes it possible to support variable-encoding instructions of the core ISA, like const16, and will allow to support advanced Xtensa features, like FLIX and TIE.

Development branch is available at:

git://github.com/OSLL/qemu-xtensa.git xtensa-libisa

Changes v1->v2:
- add sed transformation to target/xtensa/import-core.sh that drops #include "ansidecl.h" from imported xtensa-modules.c;
- drop #include "ansidecl.h" from xtensa-modules.c for converted cores;
- reimplement translate_const16 using tcg_gen_deposit_i32.

Max Filippov (16):
target/xtensa: pass actual frame size to the entry helper target/xtensa: import libisa source target/xtensa: extract core opcode translators target/xtensa: extract FPU2000 opcode translators target/xtensa: update import_core.sh script for libisa target/xtensa: switch dc232b to libisa target/xtensa: switch dc233c to libisa target/xtensa: switch fsf to libisa target/xtensa: use libisa for instruction decoding target/xtensa: tests: fix memctl SR test target/xtensa: drop DisasContext::litbase target/xtensa: add internal/noop SRs and opcodes target/xtensa: implement salt/saltu target/xtensa: implement GPIO32
target/xtensa: implement const16
target/xtensa: implement disassembler

 MAINTAINERS                                |     1 +
 disas/Makefile.objs                        |     1 +
 disas/xtensa.c                             |   133 +
 include/disas/bfd.h                        |     1 +
 include/hw/xtensa/xtensa-isa.h             |   838 ++
 target/xtensa/Makefile.objs                |     1 +
 target/xtensa/core-dc232b.c                |     4 +
 target/xtensa/core-dc232b/xtensa-modules.c | 14105 +++++++++++++++++++++++++
 target/xtensa/core-dc233c.c                |     4 +
 target/xtensa/core-dc233c/xtensa-modules.c | 15232 +++++++++++++++++++++++++++
 target/xtensa/core-fsf.c                   |     5 +
 target/xtensa/core-fsf/xtensa-modules.c    |  9841 +++++++++++++++++
 target/xtensa/cpu.c                        |     9 +
 target/xtensa/cpu.h                        |    31 +
 target/xtensa/helper.c                     |    37 +
 target/xtensa/import_core.sh               |    15 +
 target/xtensa/op_helper.c                  |     2 +-
 target/xtensa/translate.c                  |  5883 +++++++----
 target/xtensa/xtensa-isa-internal.h        |   231 +
 target/xtensa/xtensa-isa.c                 |  1745 +++
 target/xtensa/xtensa-isa.h                 |     1 +
 tests/tcg/xtensa/test_sr.S                 |     2 +-
 22 files changed, 45949 insertions(+), 2173 deletions(-)
 create mode 100644 disas/xtensa.c
 create mode 100644 include/hw/xtensa/xtensa-isa.h
 create mode 100644 target/xtensa/core-dc232b/xtensa-modules.c
 create mode 100644 target/xtensa/core-dc233c/xtensa-modules.c
 create mode 100644 target/xtensa/core-fsf/xtensa-modules.c
 create mode 100644 target/xtensa/xtensa-isa-internal.h
 create mode 100644 target/xtensa/xtensa-isa.c
 create mode 100644 target/xtensa/xtensa-isa.h

2.1.4