tcg: Initialize the prologue after GUEST_BASE is fixed.

This will allow backends to make intelligent choices about how
to implement GUEST_BASE.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

bsd-user/main.c

@@ -30,7 +30,7 @@
 #include "qemu-common.h"
 /* For tb_lock */
 #include "exec-all.h"
-
+#include "tcg.h"
 #include "qemu-timer.h"
 #include "envlist.h"
 
@@ -970,6 +970,13 @@ int main(int argc, char **argv)
     syscall_init();
     signal_init();
 
+#if defined(CONFIG_USE_GUEST_BASE)
+    /* Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
+       generating the prologue until now so that the prologue can take
+       the real value of GUEST_BASE into account.  */
+    tcg_prologue_init(&tcg_ctx);
+#endif
+
     /* build Task State */
     memset(ts, 0, sizeof(TaskState));
     init_task_state(ts);

exec.c

@@ -574,6 +574,11 @@ void cpu_exec_init_all(unsigned long tb_size)
 #if !defined(CONFIG_USER_ONLY)
     io_mem_init();
 #endif
+#if !defined(CONFIG_USER_ONLY) || !defined(CONFIG_USE_GUEST_BASE)
+    /* There's no guest base to take into account, so go ahead and
+       initialize the prologue now.  */
+    tcg_prologue_init(&tcg_ctx);
+#endif
 }
 
 #if defined(CPU_SAVE_VERSION) && !defined(CONFIG_USER_ONLY)

linux-user/main.c

@@ -31,7 +31,7 @@
 #include "cache-utils.h"
 /* For tb_lock */
 #include "exec-all.h"
-
+#include "tcg.h"
 #include "qemu-timer.h"
 #include "envlist.h"
 
@@ -2984,6 +2984,13 @@ int main(int argc, char **argv, char **envp)
     syscall_init();
     signal_init();
 
+#if defined(CONFIG_USE_GUEST_BASE)
+    /* Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
+       generating the prologue until now so that the prologue can take
+       the real value of GUEST_BASE into account.  */
+    tcg_prologue_init(&tcg_ctx);
+#endif
+
 #if defined(TARGET_I386)
     cpu_x86_set_cpl(env, 3);
 

tcg/tcg.c

@@ -240,7 +240,10 @@ void tcg_context_init(TCGContext *s)
     }
     
     tcg_target_init(s);
+}
 
+void tcg_prologue_init(TCGContext *s)
+{
     /* init global prologue and epilogue */
     s->code_buf = code_gen_prologue;
     s->code_ptr = s->code_buf;

tcg/tcg.h

@@ -346,6 +346,7 @@ static inline void *tcg_malloc(int size)
 }
 
 void tcg_context_init(TCGContext *s);
+void tcg_prologue_init(TCGContext *s);
 void tcg_func_start(TCGContext *s);
 
 int tcg_gen_code(TCGContext *s, uint8_t *gen_code_buf);