swapcontext wrapper can not be implemented in C, the stack pointer saved in

the context becomes invalid when the function returns, same as setjmp,
it must be implemented in assemble language, see discussions in PR
misc/177624.

1 files changed, 1 insertions, 10 deletions

diff --git a/lib/libthr/thread/thr_sig.c b/lib/libthr/thread/thr_sig.c
index d2be994..a99395f 100644
--- a/lib/libthr/thread/thr_sig.c
+++ b/lib/libthr/thread/thr_sig.c
@@ -737,13 +737,4 @@ _setcontext(const ucontext_t *ucp)
 	return __sys_setcontext(&uc);
 }
 
-__weak_reference(_swapcontext, swapcontext);
-int
-_swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
-{
-	ucontext_t uc;
-
-	(void) memcpy(&uc, ucp, sizeof(uc));
-	remove_thr_signals(&uc.uc_sigmask);
-	return __sys_swapcontext(oucp, &uc);
-}
+__weak_reference(__sys_swapcontext, swapcontext);