$NetBSD: patch-ad,v 1.19 2010/10/16 04:32:18 kefren Exp $
--- mono/utils/mono-sigcontext.h.orig	2010-10-07 19:02:08.000000000 +0300
+++ mono/utils/mono-sigcontext.h	2010-10-07 19:02:31.000000000 +0300
@@ -101,6 +101,20 @@
 	#define UCONTEXT_REG_R15(ctx) (((ucontext_t*)(ctx))->uc_mcontext->__ss.__r15)
 #elif defined(__FreeBSD__)
 #define UCONTEXT_GREGS(ctx)	((guint64*)&(((ucontext_t*)(ctx))->uc_mcontext))
+#elif defined(__NetBSD__)
+	#define UCONTEXT_REG_RAX(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RAX])
+	#define UCONTEXT_REG_RBX(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RBX])
+	#define UCONTEXT_REG_RCX(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RCX])
+	#define UCONTEXT_REG_RDX(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RDX])
+	#define UCONTEXT_REG_RBP(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RBP])
+	#define UCONTEXT_REG_RSP(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RSP])
+	#define UCONTEXT_REG_RSI(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RSI])
+	#define UCONTEXT_REG_RDI(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RDI])
+	#define UCONTEXT_REG_RIP(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_RIP])
+	#define UCONTEXT_REG_R12(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_R12])
+	#define UCONTEXT_REG_R13(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_R13])
+	#define UCONTEXT_REG_R14(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_R14])
+	#define UCONTEXT_REG_R15(ctx) (((ucontext_t*)(ctx))->uc_mcontext.__gregs [_REG_R15])
 #elif defined(__OpenBSD__)
     /* OpenBSD/amd64 has no gregs array, ucontext_t == sigcontext */
 	#define UCONTEXT_REG_RAX(ctx) ((ctx)->sc_rax)