XXXex instr disasm

diff --git a/sys/arm/arm/disassem.c b/sys/arm/arm/disassem.c
index b0d77c7..4bdd521 100644
--- a/sys/arm/arm/disassem.c
+++ b/sys/arm/arm/disassem.c
@@ -122,6 +122,17 @@ static const struct arm32_insn arm32_i[] = {
     { 0x0fe000f0, 0x00c00090, "smull", "Sdnms" },
     { 0x0fe000f0, 0x00a00090, "umlal", "Sdnms" },
     { 0x0fe000f0, 0x00e00090, "smlal", "Sdnms" },
+
+    { 0xffffffff, 0xf57ff01f, "clrex", "c" },
+    { 0x0ff00ff0, 0x01800f90, "strex", "dmo" },
+    { 0x0ff00fff, 0x01900f9f, "ldrex", "do" },
+    { 0x0ff00ff0, 0x01a00f90, "strexd",        "dmo" },
+    { 0x0ff00fff, 0x01b00f9f, "ldrexd",        "do" },
+    { 0x0ff00ff0, 0x01c00f90, "strexb",        "dmo" },
+    { 0x0ff00fff, 0x01d00f9f, "ldrexb",        "do" },
+    { 0x0ff00ff0, 0x01e00f90, "strexh",        "dmo" },
+    { 0x0ff00fff, 0x01f00f9f, "ldrexh",        "do" },
+
     { 0x0d700000, 0x04200000, "strt",  "daW" },
     { 0x0d700000, 0x04300000, "ldrt",  "daW" },
     { 0x0d700000, 0x04600000, "strbt", "daW" },