$NetBSD: patch-bi,v 1.2 2012/10/24 15:36:47 joerg Exp $

--- hotspot/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp.orig	2009-10-17 16:49:37.000000000 +0200
+++ hotspot/src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp
@@ -60,7 +60,7 @@
 #define SPELL_REG_FP "ebp"
 #endif // AMD64
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__DragonFly__)
 # define context_trapno uc_mcontext.mc_trapno
 # ifdef AMD64
 #  define context_pc uc_mcontext.mc_rip
@@ -275,14 +275,7 @@
 #endif
 
 address os::current_stack_pointer() {
-#ifdef SPARC_WORKS
-  register void *esp;
-  __asm__("mov %%"SPELL_REG_SP", %0":"=r"(esp));
-  return (address) ((char*)esp + sizeof(long)*2);
-#else
-  register void *esp __asm__ (SPELL_REG_SP);
-  return (address) esp;
-#endif
+  return (address)__builtin_frame_address(0);
 }
 
 char* os::non_memory_address_word() {
@@ -358,13 +351,7 @@ frame os::get_sender_for_C_frame(frame* 
 }
 
 intptr_t* _get_previous_fp() {
-#ifdef SPARC_WORKS
-  register intptr_t **ebp;
-  __asm__("mov %%"SPELL_REG_FP", %0":"=r"(ebp));
-#else
-  register intptr_t **ebp __asm__ (SPELL_REG_FP);
-#endif
-  return (intptr_t*) *ebp;   // we want what it points to.
+  return (intptr_t *)__builtin_frame_address(1);
 }