[PATCH 3/6] bsd-user/freebsd/os-syscall.c: Tracing and error boilerplate

[Warner Losh]

Add in the tracing and this system call not implemented boilerplate. Do
this by moving the guts of do_freebsd_syscall to freebsd_syscall. Put
the tracing in the wrapper function. Since freebsd_syscall is a
singleton static function, it will almost certainly be inlined. Fix
comments that referred to do_syscall since that was renamed some tie
ago.

Signed-off-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/freebsd/os-syscall.c | 50 ++++++++++++++++++++++++++++++++---
 1 file changed, 46 insertions(+), 4 deletions(-)

diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index 510307f29d9..334c573739b 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -201,16 +201,58 @@ void unlock_iovec(struct iovec *vec, abi_ulong 
target_addr,
 }
 
 /*
- * do_syscall() should always have a single exit point at the end so that
- * actions, such as logging of syscall results, can be performed.  All errnos
- * that do_syscall() returns must be -TARGET_<errcode>.
+ * All errnos that freebsd_syscall() returns must be -TARGET_<errcode>.
+ */
+static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
+                                abi_long arg2, abi_long arg3, abi_long arg4,
+                                abi_long arg5, abi_long arg6, abi_long arg7,
+                                abi_long arg8)
+{
+    abi_long ret;
+
+    switch (num) {
+    default:
+        gemu_log("qemu: unsupported syscall: %d\n", num);
+        ret = -TARGET_ENOSYS;
+        break;
+    }
+
+    return ret;
+}
+
+/*
+ * do_freebsd_syscall() should always have a single exit point at the end so
+ * that actions, such as logging of syscall results, can be performed. This
+ * as a wrapper around freebsd_syscall() so that actually happens. Since
+ * that is a singleton, modern compilers will inline it anyway...
  */
 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
                             abi_long arg2, abi_long arg3, abi_long arg4,
                             abi_long arg5, abi_long arg6, abi_long arg7,
                             abi_long arg8)
 {
-    return 0;
+    CPUState *cpu = env_cpu(cpu_env);
+    int ret;
+
+#ifdef DEBUG
+    gemu_log("freebsd syscall %d\n", num);
+#endif
+    trace_guest_user_syscall(cpu, num, arg1, arg2, arg3, arg4, arg5, arg6, 
arg7, arg8);
+    if (do_strace) {
+        print_freebsd_syscall(num, arg1, arg2, arg3, arg4, arg5, arg6);
+    }
+
+    ret = freebsd_syscall(cpu_env, num, arg1, arg2, arg3, arg4, arg5, arg6,
+                          arg7, arg8);
+#ifdef DEBUG
+    gemu_log(" = %ld\n", ret);
+#endif
+    if (do_strace) {
+        print_freebsd_syscall_ret(num, ret);
+    }
+    trace_guest_user_syscall_ret(cpu, num, ret);
+
+    return ret;
 }
 
 void syscall_init(void)
-- 
2.33.1