bsd-user: Implement mmap(2) and munmap(2)

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Karim Taha <kariem.taha2.7@gmail.com>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230925182709.4834-13-kariem.taha2.7@gmail.com>

bsd-user/bsd-mem.h

@@ -61,4 +61,24 @@ extern struct bsd_shm_regions bsd_shm_regions[];
 extern abi_ulong target_brk;
 extern abi_ulong initial_target_brk;
 
+/* mmap(2) */
+static inline abi_long do_bsd_mmap(void *cpu_env, abi_long arg1, abi_long arg2,
+    abi_long arg3, abi_long arg4, abi_long arg5, abi_long arg6, abi_long arg7,
+    abi_long arg8)
+{
+    if (regpairs_aligned(cpu_env) != 0) {
+        arg6 = arg7;
+        arg7 = arg8;
+    }
+    return get_errno(target_mmap(arg1, arg2, arg3,
+                                 target_to_host_bitmask(arg4, mmap_flags_tbl),
+                                 arg5, target_arg64(arg6, arg7)));
+}
+
+/* munmap(2) */
+static inline abi_long do_bsd_munmap(abi_long arg1, abi_long arg2)
+{
+    return get_errno(target_munmap(arg1, arg2));
+}
+
 #endif /* BSD_USER_BSD_MEM_H */

bsd-user/freebsd/os-syscall.c

@@ -798,6 +798,15 @@ static abi_long freebsd_syscall(void *cpu_env, int num, abi_long arg1,
         /*
          * Memory management system calls.
          */
+    case TARGET_FREEBSD_NR_mmap: /* mmap(2) */
+        ret = do_bsd_mmap(cpu_env, arg1, arg2, arg3, arg4, arg5, arg6, arg7,
+                          arg8);
+        break;
+
+    case TARGET_FREEBSD_NR_munmap: /* munmap(2) */
+        ret = do_bsd_munmap(arg1, arg2);
+        break;
+
 #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);