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[RFC 0/2] xtensa: add call0 ABI support


Hello,

this series adds call0 ABI support for xtensa. Code generation part is
well tested, but I'm not 100% sure about the exception handling part.
Please review.

Max Filippov (2):
  Turn RETURN_ADDR_IN_PREVIOUS_FRAME into C expression
  Implement call0 ABI for xtensa

 gcc/builtins.c                      |   2 +-
 gcc/config/sparc/sparc.h            |   2 +-
 gcc/config/xtensa/constraints.md    |   6 +-
 gcc/config/xtensa/xtensa-protos.h   |   3 +
 gcc/config/xtensa/xtensa.c          | 561 ++++++++++++++++++++++++++++--------
 gcc/config/xtensa/xtensa.h          |  67 +++--
 gcc/config/xtensa/xtensa.md         |  48 ++-
 libgcc/config/xtensa/lib2funcs.S    |  10 +
 libgcc/config/xtensa/linux-unwind.h |   3 +
 libgcc/config/xtensa/t-windowed     |   2 +
 libgcc/config/xtensa/t-xtensa       |   3 -
 libgcc/configure                    |  21 ++
 libgcc/configure.ac                 |  16 +
 13 files changed, 588 insertions(+), 156 deletions(-)
 create mode 100644 libgcc/config/xtensa/t-windowed

-- 
1.8.1.4


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