diff --git a/share/sysdefs/devctl.h b/share/sysdefs/devctl.h
index 22acb9b..658ce0e 100644
--- a/share/sysdefs/devctl.h
+++ b/share/sysdefs/devctl.h
@@ -1,10 +1,12 @@
 #ifndef SHARE_SYSDEFS_DEVCTL_H_
 #define SHARE_SYSDEFS_DEVCTL_H_
 
-enum {
-  DEVCTL_GET_HANDLE = 100,
-};
+#define DEVCTL_GET_HANDLE 100
+
+#if !defined(__ASSEMBLER__)
 
 typedef uint64_t Dev_t;
 
+#endif
+
 #endif // SHARE_SYSDEFS_DEVCTL_H_
diff --git a/share/sysdefs/ioctl.h b/share/sysdefs/ioctl.h
index 1e03e54..eba827a 100644
--- a/share/sysdefs/ioctl.h
+++ b/share/sysdefs/ioctl.h
@@ -1,30 +1,26 @@
 #ifndef SHARE_SYSDEFS_IOCTL_H_
 #define SHARE_SYSDEFS_IOCTL_H_
 
-#include <stdint.h>
-#include <stddef.h>
-
 #define IOCTL_NOHANDLE (-1)
 
-enum {
-  IOCTL_OPENF = 0,
-  IOCTL_CLOSEF = 1,
-  IOCTL_READ = 2,
-  IOCTL_STAT = 3,
-  IOCTL_WRITE = 4,
-  IOCTL_FETCHDIRENT = 5,
-};
+#define IOCTL_OPENF         0
+#define IOCTL_CLOSEF        1
+#define IOCTL_READ          2
+#define IOCTL_STAT          3
+#define IOCTL_WRITE         4
+#define IOCTL_FETCHDIRENT   5
 
-enum {
-  IOCTL_F_READ = 1<<0,
-  IOCTL_F_WRITE = 1<<1,
-  IOCTL_F_MAKE = 1<<2,
-};
+#define IOCTL_F_READ    (1<<0)
+#define IOCTL_F_WRITE   (1<<1)
+#define IOCTL_F_MAKE    (1<<2)
 
-enum {
-  IOCTLSTAT_DIR = 0,
-  IOCTLSTAT_FILE = 1,
-};
+#define IOCTLSTAT_DIR   0
+#define IOCTLSTAT_FILE  1
+
+#if !defined(__ASSEMBLER__)
+
+#include <stdint.h>
+#include <stddef.h>
 
 typedef struct IoctlStat {
   size_t size;
@@ -38,4 +34,6 @@ typedef struct IoctlDirent {
 
 typedef int32_t IOH;
 
+#endif
+
 #endif // SHARE_SYSDEFS_IOCTL_H_
diff --git a/share/sysdefs/ipcpipe.h b/share/sysdefs/ipcpipe.h
index b98c09f..c8ba754 100644
--- a/share/sysdefs/ipcpipe.h
+++ b/share/sysdefs/ipcpipe.h
@@ -9,13 +9,11 @@
 #define IPCPIPE_OUT (0)
 #define IPCPIPE_IN  (1)
 
-enum {
-  IPCPIPE_MAKE  = 0,
-  IPCPIPE_READ  = 1,
-  IPCPIPE_WRITE = 2,
-  IPCPIPE_ADD_BCAST = 3,
-  IPCPIPE_REPLACE = 4,
-  IPCPIPE_DELETE = 5,
-};
+#define IPCPIPE_MAKE      0
+#define IPCPIPE_READ      1
+#define IPCPIPE_WRITE     2
+#define IPCPIPE_ADD_BCAST 3
+#define IPCPIPE_REPLACE   4
+#define IPCPIPE_DELETE    5
 
 #endif // SHARE_SYSDEFS_IPCPIPE_H_
diff --git a/share/sysdefs/mman.h b/share/sysdefs/mman.h
index 1fd42ff..e473183 100644
--- a/share/sysdefs/mman.h
+++ b/share/sysdefs/mman.h
@@ -1,12 +1,8 @@
 #ifndef SHARE_SYSDEFS_MMAN_H_
 #define SHARE_SYSDEFS_MMAN_H_
 
-enum {
-  MMAN_MAP_PF_RW = (1<<0),
-};
+#define MMAN_MAP_PF_RW (1<<0)
 
-enum {
-  MMAN_MAP_F_FIXED = (1<<0),
-};
+#define MMAN_MAP_F_FIXED (1<<0)
 
 #endif // SHARE_SYSDEFS_MMAN_H_
diff --git a/share/sysdefs/processctl.h b/share/sysdefs/processctl.h
index 95db039..8abe4c1 100644
--- a/share/sysdefs/processctl.h
+++ b/share/sysdefs/processctl.h
@@ -3,17 +3,17 @@
 
 #define PROC_ARG_MAX 128
 
-enum {
-  PCTL_KILL       = 0,
-  PCTL_SPAWN      = 1,
-  PCTL_POLLSTATE  = 2,
-  PCTL_RUN        = 3,
-  PCTL_GETPID     = 4,
-  PCTL_ARGLEN     = 5,
-  PCTL_ARGV       = 6,
-  PCTL_PLS_SZ     = 7,
-  PCTL_PLS_STAT   = 8,
-};
+#define PCTL_KILL       0
+#define PCTL_SPAWN      1
+#define PCTL_POLLSTATE  2
+#define PCTL_RUN        3
+#define PCTL_GETPID     4
+#define PCTL_ARGLEN     5
+#define PCTL_ARGV       6
+#define PCTL_PLS_SZ     7
+#define PCTL_PLS_STAT   8
+
+#if !defined(__ASSEMBLER__)
 
 typedef struct {
   uint64_t pid;
@@ -24,4 +24,6 @@ typedef struct {
 
 typedef uint64_t PID_t;
 
+#endif
+
 #endif // SHARE_HDRS_PROCESSCTL_H_
diff --git a/share/sysdefs/syscall.h b/share/sysdefs/syscall.h
index c547489..89286fa 100644
--- a/share/sysdefs/syscall.h
+++ b/share/sysdefs/syscall.h
@@ -1,15 +1,13 @@
 #ifndef SHARE_HDRS_SYSCALL_H_
 #define SHARE_HDRS_SYSCALL_H_
 
-enum {
-  SYS_DEBUGPRINT = 1,
-  SYS_PROCESSCTL = 2,
-  SYS_IOCTL      = 3,
-  SYS_IPCPIPE    = 4,
-  SYS_MMAN_MAP   = 5,
-  SYS_MMAN_UNMAP = 6,
-  SYS_SCHEDRELEASE = 7,
-  SYS_DEVCTL     = 8,
-};
+#define SYS_DEBUGPRINT 1
+#define SYS_PROCESSCTL 2
+#define SYS_IOCTL      3
+#define SYS_IPCPIPE    4
+#define SYS_MMAN_MAP   5
+#define SYS_MMAN_UNMAP 6
+#define SYS_SCHEDRELEASE 7
+#define SYS_DEVCTL     8
 
 #endif // SHARE_HDRS_SYSCALL_H_