user: Move 'thunk.h' from 'exec/user' to 'user'

Keep all user emulation headers under the same user/ directory.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240428221450.26460-2-philmd@linaro.org>

MAINTAINERS

@@ -3692,7 +3692,6 @@ Overall usermode emulation
 M: Riku Voipio <riku.voipio@iki.fi>
 S: Maintained
 F: accel/tcg/user-exec*.c
-F: include/exec/user/
 F: include/user/
 F: common-user/
 

bsd-user/qemu.h

@@ -26,7 +26,7 @@
 
 extern char **environ;
 
-#include "exec/user/thunk.h"
+#include "user/thunk.h"
 #include "target_arch.h"
 #include "syscall_defs.h"
 #include "target_syscall.h"

include/user/thunk.h

@@ -17,8 +17,12 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef THUNK_H
-#define THUNK_H
+#ifndef USER_THUNK_H
+#define USER_THUNK_H
+
+#ifndef CONFIG_USER_ONLY
+#error Cannot include this header from system emulation
+#endif
 
 #include "cpu.h"
 #include "user/abitypes.h"

linux-user/thunk.c

@@ -20,7 +20,7 @@
 #include "qemu/log.h"
 
 #include "qemu.h"
-#include "exec/user/thunk.h"
+#include "user/thunk.h"
 
 //#define DEBUG
 

linux-user/user-internals.h

@@ -18,7 +18,7 @@
 #ifndef LINUX_USER_USER_INTERNALS_H
 #define LINUX_USER_USER_INTERNALS_H
 
-#include "exec/user/thunk.h"
+#include "user/thunk.h"
 #include "exec/exec-all.h"
 #include "exec/tb-flush.h"
 #include "qemu/log.h"