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#include <stddef.h>
#include <signal.h>
#include <sys/ucontext.h>
--
SIG_BLOCK
SIG_SETMASK
_NSIG8 (_NSIG / 8)
#define ucontext(member) offsetof (ucontext_t, member)
#define mcontext(member) ucontext (uc_mcontext.member)
#define mreg(reg) mcontext (gregs[REG_##reg])
oRBP mreg (RBP)
oRSP mreg (RSP)
oRBX mreg (RBX)
oR8 mreg (R8)
oR9 mreg (R9)
oR12 mreg (R12)
oR13 mreg (R13)
oR14 mreg (R14)
oR15 mreg (R15)
oRDI mreg (RDI)
oRSI mreg (RSI)
oRDX mreg (RDX)
oRAX mreg (RAX)
oRCX mreg (RCX)
oRIP mreg (RIP)
oFPREGS mcontext (fpregs)
oSIGMASK ucontext (uc_sigmask)
oFPREGSMEM ucontext (__fpregs_mem)
oMXCSR ucontext (__fpregs_mem.mxcsr)
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