bsd-user: Implement shm_open2(2) system call

Signed-off-by: Kyle Evans <kevans@FreeBSD.org>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230925182709.4834-6-kariem.taha2.7@gmail.com>

bsd-user/freebsd/os-misc.h

@@ -24,5 +24,51 @@
 #include <sys/random.h>
 #include <sched.h>
 
+/*
+ * shm_open2 isn't exported, but the __sys_ alias is. We can use either for the
+ * static version, but to dynamically link we have to use the sys version.
+ */
+int __sys_shm_open2(const char *path, int flags, mode_t mode, int shmflags,
+    const char *);
+
+#if defined(__FreeBSD_version) && __FreeBSD_version >= 1300048
+/* shm_open2(2) */
+static inline abi_long do_freebsd_shm_open2(abi_ulong pathptr, abi_ulong flags,
+    abi_long mode, abi_ulong shmflags, abi_ulong nameptr)
+{
+    int ret;
+    void *uname, *upath;
+
+    if (pathptr == (uintptr_t)SHM_ANON) {
+        upath = SHM_ANON;
+    } else {
+        upath = lock_user_string(pathptr);
+        if (upath == NULL) {
+            return -TARGET_EFAULT;
+        }
+    }
+
+    uname = NULL;
+    if (nameptr != 0) {
+        uname = lock_user_string(nameptr);
+        if (uname == NULL) {
+            unlock_user(upath, pathptr, 0);
+            return -TARGET_EFAULT;
+        }
+    }
+    ret = get_errno(__sys_shm_open2(upath,
+                target_to_host_bitmask(flags, fcntl_flags_tbl), mode,
+                target_to_host_bitmask(shmflags, shmflag_flags_tbl), uname));
+
+    if (upath != SHM_ANON) {
+        unlock_user(upath, pathptr, 0);
+    }
+    if (uname != NULL) {
+        unlock_user(uname, nameptr, 0);
+    }
+    return ret;
+}
+#endif /* __FreeBSD_version >= 1300048 */
+
 
 #endif /* OS_MISC_H */

bsd-user/freebsd/os-syscall.c

@@ -33,18 +33,14 @@
 #include "signal-common.h"
 #include "user/syscall-trace.h"
 
+/* BSD independent syscall shims */
 #include "bsd-file.h"
 #include "bsd-proc.h"
 
 /* BSD dependent syscall shims */
 #include "os-stat.h"
 #include "os-proc.h"
-
+#include "os-misc.h"
-/* used in os-proc */
-safe_syscall4(pid_t, wait4, pid_t, wpid, int *, status, int, options,
-    struct rusage *, rusage);
-safe_syscall6(pid_t, wait6, idtype_t, idtype, id_t, id, int *, status, int,
-    options, struct __wrusage *, wrusage, siginfo_t *, infop);
 
 /* I/O */
 safe_syscall3(int, open, const char *, path, int, flags, mode_t, mode);
@@ -65,6 +61,12 @@ safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt);
 safe_syscall4(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt,
     off_t, offset);
 
+/* used in os-proc */
+safe_syscall4(pid_t, wait4, pid_t, wpid, int *, status, int, options,
+    struct rusage *, rusage);
+safe_syscall6(pid_t, wait6, idtype_t, idtype, id_t, id, int *, status, int,
+    options, struct __wrusage *, wrusage, siginfo_t *, infop);
+
 void target_set_brk(abi_ulong new_brk)
 {
 }
@@ -796,6 +798,14 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
         ret = do_freebsd_fcntl(arg1, arg2, arg3);
         break;
 
+        /*
+         * Memory management system calls.
+         */
+#if defined(__FreeBSD_version) && __FreeBSD_version >= 1300048
+    case TARGET_FREEBSD_NR_shm_open2: /* shm_open2(2) */
+        ret = do_freebsd_shm_open2(arg1, arg2, arg3, arg4, arg5);
+        break;
+#endif
 
         /*
          * sys{ctl, arch, call}