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related to issue boostorg#200
Fixes for currently broken Darwin ppc/ppc64 assembler
Support for stack protection
Shadow stack is part of Intel's Control-Flow Enforcement
Technology(CET).
Whenever a function is called, the return address is pushed onto both
the regular stack and the shadow stack. When that function returns, the
return addresses are popped off both stacks and compared; if they fail
to match, #CP raised.
With this commit, we create shadow stack for each fcontext and switch
the shadow stack accordingly during fcontext switch.
Signed-off-by: PeterYang12 <[email protected]>
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