[PATCH 04/10] bsd-user: Implement freebsd11_mknod, freebsd11_mknodat and mknodat

[Warner Losh]

These implement both the old-pre INO64 mknod variations, as well as the
now current INO64 variant. To implement the old stuff, we use some
linker magic to bind to the old versions of these functions.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Michal Meloun <mmel@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/bsd-file.h           | 59 +++++++++++++++++++++++++++++++++++
 bsd-user/freebsd/os-syscall.c | 15 +++++++++
 2 files changed, 74 insertions(+)

diff --git a/bsd-user/bsd-file.h b/bsd-user/bsd-file.h
index 0585f6a2a40..3be832b2a74 100644
--- a/bsd-user/bsd-file.h
+++ b/bsd-user/bsd-file.h
@@ -51,6 +51,16 @@ do {                                        \
     unlock_user(p1, arg1, 0);               \
 } while (0)
 
+#ifndef BSD_HAVE_INO64
+#define freebsd11_mknod         mknod
+#define freebsd11_mknodat       mknodat
+#else
+int freebsd11_mknod(char *path, mode_t mode, uint32_t dev);
+__sym_compat(mknod, freebsd11_mknod, FBSD_1.0);
+int freebsd11_mknodat(int fd, char *path, mode_t mode, uint32_t dev);
+__sym_compat(mknodat, freebsd11_mknodat, FBSD_1.1);
+#endif
+
 extern struct iovec *lock_iovec(int type, abi_ulong target_addr, int count,
         int copy);
 extern void unlock_iovec(struct iovec *vec, abi_ulong target_addr, int count,
@@ -722,4 +732,53 @@ static abi_long do_bsd_fchmodat(abi_long arg1, abi_long 
arg2,
     return ret;
 }
 
+/* pre-ino64 mknod(2) */
+static abi_long do_bsd_freebsd11_mknod(abi_long arg1, abi_long arg2, abi_long 
arg3)
+{
+    abi_long ret;
+    void *p;
+
+    LOCK_PATH(p, arg1);
+    ret = get_errno(freebsd11_mknod(p, arg2, arg3)); /* XXX path(p)? */
+    UNLOCK_PATH(p, arg1);
+
+    return ret;
+}
+
+/* pre-ino64 mknodat(2) */
+static abi_long do_bsd_freebsd11_mknodat(abi_long arg1, abi_long arg2,
+        abi_long arg3, abi_long arg4)
+{
+    abi_long ret;
+    void *p;
+
+    LOCK_PATH(p, arg2);
+    ret = get_errno(freebsd11_mknodat(arg1, p, arg3, arg4));
+    UNLOCK_PATH(p, arg2);
+
+    return ret;
+}
+
+#ifdef BSD_HAVE_INO64
+/* post-ino64 mknodat(2) */
+static abi_long do_bsd_mknodat(void *cpu_env, abi_long arg1,
+        abi_long arg2, abi_long arg3, abi_long arg4, abi_long arg5,
+        abi_long arg6)
+{
+    abi_long ret;
+    void *p;
+
+    LOCK_PATH(p, arg2);
+       /* 32-bit arch's use two 32 registers for 64 bit return value */
+    if (regpairs_aligned(cpu_env) != 0) {
+        ret = get_errno(mknodat(arg1, p, arg3, target_arg64(arg5, arg6)));
+    } else {
+        ret = get_errno(mknodat(arg1, p, arg3, target_arg64(arg4, arg5)));
+    }
+    UNLOCK_PATH(p, arg2);
+
+    return ret;
+}
+#endif
+
 #endif /* BSD_FILE_H */
diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c
index b33d548a4b6..fea6a857b78 100644
--- a/bsd-user/freebsd/os-syscall.c
+++ b/bsd-user/freebsd/os-syscall.c
@@ -32,6 +32,7 @@
 #include "qemu/cutils.h"
 #include "qemu/path.h"
 #include <sys/syscall.h>
+#include <sys/cdefs.h>
 #include <sys/param.h>
 #include <sys/mount.h>
 #include <sys/sysctl.h>
@@ -418,6 +419,20 @@ static abi_long freebsd_syscall(void *cpu_env, int num, 
abi_long arg1,
         ret = do_bsd_fchmodat(arg1, arg2, arg3, arg4);
         break;
 
+    case TARGET_FREEBSD_NR_freebsd11_mknod: /* mknod(2) */
+        ret = do_bsd_freebsd11_mknod(arg1, arg2, arg3);
+        break;
+
+    case TARGET_FREEBSD_NR_freebsd11_mknodat: /* mknodat(2) */
+        ret = do_bsd_freebsd11_mknodat(arg1, arg2, arg3, arg4);
+        break;
+
+#ifdef BSD_HAVE_INO64
+    case TARGET_FREEBSD_NR_mknodat: /* mknodat(2) */
+        ret = do_bsd_mknodat(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6);
+        break;
+#endif
+
     default:
         qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
         ret = -TARGET_ENOSYS;
-- 
2.33.1