Implementation of the user-level fault handler#376

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WenyuanShao wants to merge 28 commits intogwsystems:pposfrom WenyuanShao:ppos

+431-106

Commits on Jun 16, 2018

Commits on Jun 21, 2018

bring back the fourth arguement
WenyuanShao
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Commits on Jun 26, 2018

Commits on Jun 29, 2018

change name of the functions and variables
WenyuanShao
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Commits on Jul 3, 2018

update the introspect of the thread registers
WenyuanShao
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Commits on Jul 6, 2018

make the fault_handler an interface
WenyuanShao
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Commits on Jul 8, 2018

update the interface and add a new API
WenyuanShao
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Commits on Jul 9, 2018

fix some style issue.
WenyuanShao
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Commits on Jul 11, 2018

achitecture based optimization: sp & in_fault now conbined to sp_fault, get rid of a branch in the fast path by make sinv cap to fault handler another type.
WenyuanShao
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Commits on Jul 12, 2018

roll back and separate sp and in_fault.
WenyuanShao
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Commits on Jul 20, 2018

optimize the invstk_entry by combine the in_fault bit with captbl of the component which starts the invocation.
WenyuanShao
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Commits on Jul 23, 2018

Commits on Aug 28, 2018

slove some of the problem rasied in the PR gwsystems#366 .
WenyuanShao
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Commits on Aug 29, 2018

Modify some most of the comments in the thd.h.
WenyuanShao
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Commits on Aug 31, 2018

fix one specific comment in thd.h
WenyuanShao
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Commits on Sep 10, 2018

Commits on May 20, 2019

Commits on May 21, 2019

add some TODO
WenyuanShao
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