linux-user: introduce preexit_cleanup

To avoid repeating ourselves move our preexit clean-up code into a
helper function. I figured the continuing effort to split of the
syscalls made it worthwhile creating a new file for it now.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>

linux-user/Makefile.objs

@@ -1,7 +1,7 @@
 obj-y = main.o syscall.o strace.o mmap.o signal.o \
 	elfload.o linuxload.o uaccess.o uname.o \
 	safe-syscall.o $(TARGET_ABI_DIR)/signal.o \
-        $(TARGET_ABI_DIR)/cpu_loop.o
+        $(TARGET_ABI_DIR)/cpu_loop.o exit.o
 
 obj-$(TARGET_HAS_BFLT) += flatload.o
 obj-$(TARGET_I386) += vm86.o

linux-user/exit.c

@@ -0,0 +1,28 @@
+/*
+ *  exit support for qemu
+ *
+ *  Copyright (c) 2018 Alex Bennée <alex.bennee@linaro.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#include "qemu/osdep.h"
+#include "qemu.h"
+
+void preexit_cleanup(CPUArchState *env, int code)
+{
+#ifdef TARGET_GPROF
+        _mcleanup();
+#endif
+        gdb_exit(env, code);
+}

linux-user/qemu.h

@@ -623,6 +623,14 @@ static inline int is_error(abi_long ret)
     return (abi_ulong)ret >= (abi_ulong)(-4096);
 }
 
+/**
+ * preexit_cleanup: housekeeping before the guest exits
+ *
+ * env: the CPU state
+ * code: the exit code
+ */
+void preexit_cleanup(CPUArchState *env, int code);
+
 /* Include target-specific struct and function definitions;
  * they may need access to the target-independent structures
  * above, so include them last.

linux-user/syscall.c

@@ -8022,10 +8022,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
         }
 
         cpu_list_unlock();
-#ifdef TARGET_GPROF
-        _mcleanup();
-#endif
-        gdb_exit(cpu_env, arg1);
+        preexit_cleanup(cpu_env, arg1);
         _exit(arg1);
         ret = 0; /* avoid warning */
         break;
@@ -10131,10 +10128,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #ifdef __NR_exit_group
         /* new thread calls */
     case TARGET_NR_exit_group:
-#ifdef TARGET_GPROF
-        _mcleanup();
-#endif
-        gdb_exit(cpu_env, arg1);
+        preexit_cleanup(cpu_env, arg1);
         ret = get_errno(exit_group(arg1));
         break;
 #endif