gdbstub: Build syscall.c once

There is no longer anything target specific.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-29-richard.henderson@linaro.org>

gdbstub/meson.build

@@ -31,8 +31,7 @@ user_ss.add(gdb_user)
 gdb_softmmu = declare_dependency(link_whole: libgdb_softmmu)
 softmmu_ss.add(gdb_softmmu)
 
-# These have to built to the target ABI
-specific_ss.add(files('syscalls.c'))
+common_ss.add(files('syscalls.c'))
 
 # The user-target is specialised by the guest
 specific_ss.add(when: 'CONFIG_USER_ONLY', if_true: files('user-target.c'))

gdbstub/syscalls.c

@@ -2,9 +2,7 @@
  * GDB Syscall Handling
  *
  * GDB can execute syscalls on the guests behalf, currently used by
- * the various semihosting extensions. As this interfaces with a guest
- * ABI we need to build it per-guest (although in reality its a 32 or
- * 64 bit target_ulong that is the only difference).
+ * the various semihosting extensions.
  *
  * Copyright (c) 2003-2005 Fabrice Bellard
  * Copyright (c) 2023 Linaro Ltd
@@ -14,7 +12,6 @@
 
 #include "qemu/osdep.h"
 #include "qemu/error-report.h"
-#include "cpu.h"
 #include "semihosting/semihost.h"
 #include "sysemu/runstate.h"
 #include "gdbstub/user.h"