Port libc_r to amd64, and turn it back on for amd64. It passes all of

the same src/lib/libc_r/test/* tests that the other platforms pass.

lib/Makefile

@@ -42,10 +42,11 @@ _csu=csu
 
 .if ${MACHINE_ARCH} != "amd64"
 _libstand=	libstand
+.endif
+
 .if !defined(NOLIBC_R)
 _libc_r=	libc_r
 .endif
-.endif
 
 .if !defined(NO_BIND)
 _libbind=	libbind

lib/libc_r/uthread/pthread_private.h

@@ -87,6 +87,24 @@
 	__asm__("frstor %0": :"m"(*fdata));		\
 } while (0)
 #define SET_RETURN_ADDR_JB(jb, ra)	(jb)[0]._jb[0] = (int)(ra)
+#elif	defined(__amd64__)
+#define	GET_STACK_JB(jb)	((unsigned long)((jb)[0]._jb[2]))
+#define	GET_STACK_SJB(sjb)	((unsigned long)((sjb)[0]._sjb[2]))
+#define	GET_STACK_UC(ucp)	((unsigned long)((ucp)->uc_mcontext.mc_rsp))
+#define	SET_STACK_JB(jb, stk)	(jb)[0]._jb[2] = (long)(stk)
+#define	SET_STACK_SJB(sjb, stk)	(sjb)[0]._sjb[2] = (long)(stk)
+#define	SET_STACK_UC(ucp, stk)	(ucp)->uc_mcontext.mc_rsp = (long)(stk)
+#define	FP_SAVE_UC(ucp)		do {			\
+	char	*fdata;					\
+	fdata = (char *) (ucp)->uc_mcontext.mc_fpstate;	\
+	__asm__("fxsave %0": :"m"(*fdata));		\
+} while (0)
+#define	FP_RESTORE_UC(ucp)	do {			\
+	char	*fdata;					\
+	fdata = (char *) (ucp)->uc_mcontext.mc_fpstate;	\
+	__asm__("fxrstor %0": :"m"(*fdata));		\
+} while (0)
+#define SET_RETURN_ADDR_JB(jb, ra)	(jb)[0]._jb[0] = (long)(ra)
 #elif	defined(__alpha__)
 #include <machine/reg.h>
 #define	GET_STACK_JB(jb)	((unsigned long)((jb)[0]._jb[R_SP + 4]))

usr.sbin/Makefile

@@ -141,7 +141,7 @@ SUBDIR+=ipftest \
 	iptest
 .endif
 
-.if !defined(NOLIBC_R) && ${MACHINE_ARCH} != "amd64"
+.if !defined(NOLIBC_R)
 SUBDIR+=pppctl
 .endif