diff --git a/constants.py b/constants.py
index 8e886585..3451ade8 100644
--- a/constants.py
+++ b/constants.py
@@ -220,6 +220,7 @@
     'mop_rr_7',
     'sspush_x1',
     'sspush_x5',
+    'lpad',
     'bclri.rv32',
     'bexti.rv32',
     'binvi.rv32',
diff --git a/encoding.h b/encoding.h
index b1859a62..c958745f 100644
--- a/encoding.h
+++ b/encoding.h
@@ -337,6 +337,9 @@
 #define SRMCFG_RCID  0x00000FFF
 #define SRMCFG_MCID  0x0FFF0000
 
+/* software check exception xtval codes */
+#define LANDING_PAD_FAULT 2
+
 #ifdef __riscv
 
 #if __riscv_xlen == 64
diff --git a/unratified/rv_zicfilp b/unratified/rv_zicfilp
new file mode 100644
index 00000000..1ef4844e
--- /dev/null
+++ b/unratified/rv_zicfilp
@@ -0,0 +1,2 @@
+# auipc x0 imm20 -> lpad imm20
+$pseudo_op rv_i::auipc lpad imm20 11..7=0 6..2=0x05 1..0=3