Bugzilla bug #61746: make NSPR local threads work on more NetBSD platforms.

Thanks to Charles Hannum <mycroft@netbsd.org> for the patch. r=wtc.

nsprpub/pr/include/md/_netbsd.h

@@ -87,39 +87,88 @@
 
 #define CONTEXT(_th) ((_th)->md.context)
 
-#if defined(__i386__) || defined(__sparc__) || defined(__m68k__) || defined(__powerpc__)
-#define JB_SP_INDEX 2
-#elif defined(__mips__)
-#define JB_SP_INDEX 4
-#elif defined(__alpha__)
-#define JB_SP_INDEX 34
-#elif defined(__arm32__)
-/*
- * On the arm32, the jmpbuf regs underwent a name change after NetBSD 1.3.
- */
-#ifdef JMPBUF_REG_R13
-#define JB_SP_INDEX JMPBUF_REG_R13
-#else
-#define JB_SP_INDEX _JB_REG_R13
-#endif
-#else
-#error "Need to define SP index in jmp_buf here"
-#endif
-#define _MD_GET_SP(_th)    (_th)->md.context[JB_SP_INDEX]
-
-#define PR_NUM_GCREGS	_JBLEN
-
 /*
 ** Initialize a thread context to run "_main()" when started
 */
-#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)  \
-{  \
-    *status = PR_TRUE;  \
-    if (sigsetjmp(CONTEXT(_thread), 1)) {  \
-        _main();  \
-    }  \
-    _MD_GET_SP(_thread) = (unsigned char*) ((_sp) - 64); \
+#ifdef __i386__
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)			\
+{									\
+    sigsetjmp(CONTEXT(_thread), 1);					\
+    CONTEXT(_thread)[2] = (unsigned char*) ((_sp) - 128);		\
+    CONTEXT(_thread)[0] = (int) _main;					\
+    *status = PR_TRUE;							\
 }
+#define	_MD_GET_SP(_thread)	CONTEXT(_thread)[2]
+#endif
+#ifdef __sparc__
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)			\
+{									\
+    sigsetjmp(CONTEXT(_thread), 1);					\
+    CONTEXT(_thread)[2] = (unsigned char*) ((_sp) - 128);		\
+    CONTEXT(_thread)[3] = (int) _main;					\
+    CONTEXT(_thread)[4] = (int) _main + 4;				\
+    *status = PR_TRUE;							\
+}
+#define	_MD_GET_SP(_thread)	CONTEXT(_thread)[2]
+#endif
+#ifdef __powerpc__
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)			\
+{									\
+    sigsetjmp(CONTEXT(_thread), 1);					\
+    CONTEXT(_thread)[3] = (unsigned char*) ((_sp) - 128);		\
+    CONTEXT(_thread)[4] = (int) _main;					\
+    *status = PR_TRUE;							\
+}
+#define	_MD_GET_SP(_thread)	CONTEXT(_thread)[3]
+#endif
+#ifdef __m68k__
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)			\
+{									\
+    sigsetjmp(CONTEXT(_thread), 1);					\
+    CONTEXT(_thread)[2] = (unsigned char*) ((_sp) - 128);		\
+    CONTEXT(_thread)[5] = (int) _main;					\
+    *status = PR_TRUE;							\
+}
+#define	_MD_GET_SP(_thread)	CONTEXT(_thread)[2]
+#endif
+#ifdef __mips__
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)			\
+{									\
+    sigsetjmp(CONTEXT(_thread), 1);					\
+    CONTEXT(_thread)[32] = (unsigned char*) ((_sp) - 128);		\
+    CONTEXT(_thread)[2] = (int) _main;					\
+    CONTEXT(_thread)[28] = (int) _main;					\
+    *status = PR_TRUE;							\
+}
+#define	_MD_GET_SP(_thread)	CONTEXT(_thread)[32]
+#endif
+#ifdef __arm32__
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)			\
+{									\
+    sigsetjmp(CONTEXT(_thread), 1);					\
+    CONTEXT(_thread)[23] = (unsigned char*) ((_sp) - 128);		\
+    CONTEXT(_thread)[24] = (int) _main;					\
+    *status = PR_TRUE;							\
+}
+#define	_MD_GET_SP(_thread)	CONTEXT(_thread)[23]
+#endif
+#ifdef __alpha__
+#define _MD_INIT_CONTEXT(_thread, _sp, _main, status)			\
+{									\
+    sigsetjmp(CONTEXT(_thread), 1);					\
+    CONTEXT(_thread)[34] = (unsigned char*) ((_sp) - 128);		\
+    CONTEXT(_thread)[2] = (long) _main;					\
+    CONTEXT(_thread)[30] = (long) _main;				\
+    CONTEXT(_thread)[31] = (long) _main;				\
+    *status = PR_TRUE;							\
+}
+#define	_MD_GET_SP(_thread)	CONTEXT(_thread)[34]
+#endif
+#ifndef _MD_INIT_CONTEXT
+#error "Need to define _MD_INIT_CONTEXT for this platform"
+#endif
+
+#define PR_NUM_GCREGS	_JBLEN
 
 #define _MD_SWITCH_CONTEXT(_thread)  \
     if (!sigsetjmp(CONTEXT(_thread), 1)) {  \