Provision for x86_64-linux-user target: needs get_sp_from_cpustate

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3262 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/x86_64/target_signal.h

@@ -21,4 +21,9 @@ typedef struct target_sigaltstack {
 #define TARGET_MINSIGSTKSZ	2048
 #define TARGET_SIGSTKSZ		8192
 
+static inline target_ulong get_sp_from_cpustate(CPUX86State *state)
+{
+    return state->regs[R_ESP];
+}
+
 #endif /* TARGET_SIGNAL_H */