use portable ucontext on linux/amd64

Author: 0intro

asm.S

@@ -28,6 +28,12 @@
 #endif
 #endif
 
+#if defined(__linux__) && defined(__amd64__)
+#define NEEDAMD64CONTEXT 1
+#define SET setmcontext
+#define GET getmcontext
+#endif
+
 #if defined(__linux__) && defined(__arm__)
 #define NEEDARMCONTEXT 1
 #define SET setmcontext

context.c

@@ -25,6 +25,11 @@
 #define NEEDSWAPCONTEXT
 #endif
 
+#if defined(__linux__) && defined(__amd64__)
+#define NEEDSWAPCONTEXT
+#define NEEDAMD64MAKECONTEXT
+#endif
+
 #if defined(__linux__) && defined(__arm__)
 #define NEEDSWAPCONTEXT
 #define NEEDARMMAKECONTEXT

taskimpl.h

@@ -18,6 +18,13 @@
 #define USE_UCONTEXT 0
 #endif
 
+#if  defined(__linux__) && defined(__amd64__)
+#define _UCONTEXT_H	1
+#define _SYS_UCONTEXT_H 1
+#undef USE_UCONTEXT
+#define USE_UCONTEXT 0
+#endif
+
 #if defined(__APPLE__)
 #include <AvailabilityMacros.h>
 #if defined(MAC_OS_X_VERSION_10_5)
@@ -97,6 +104,22 @@ extern	int		swapcontext(ucontext_t*, const ucontext_t*);
 extern	void		makecontext(ucontext_t*, void(*)(), int, ...);
 #endif
 
+#if defined(__linux__) && defined(__amd64__)
+typedef struct mcontext mcontext_t;
+typedef struct ucontext ucontext_t;
+extern	int		getmcontext(mcontext_t*);
+extern	void		setmcontext(const mcontext_t*);
+#define	setcontext(u)	setmcontext(&(u)->uc_mcontext)
+#define	getcontext(u)	getmcontext(&(u)->uc_mcontext)
+extern	int		swapcontext(ucontext_t*, const ucontext_t*);
+extern	void		makecontext(ucontext_t*, void(*)(), int, ...);
+#	if defined(__i386__)
+#		include "386-ucontext.h"
+#	elif defined(__x86_64__)
+#		include "amd64-ucontext.h"
+#	endif
+#endif
+
 #if defined(__APPLE__)
 #	define mcontext libthread_mcontext
 #	define mcontext_t libthread_mcontext_t