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diff --git a/gen/docs/isa_defs/registers.isa b/gen/docs/isa_defs/registers.isa
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+# Fyntv Register Definitions
+
+REGISTER x0
+  ABBR zero
+  DESC Always-zero register — reads return 0, writes are discarded
+  PRESERVE false
+  CALLER false
+  ARG false
+  INDEX 0
+END
+
+REGISTER x1
+  ABBR ra
+  DESC Return address link register
+  PRESERVE false
+  CALLER false
+  ARG false
+  INDEX 1
+END
+
+REGISTER x2
+  ABBR sp
+  DESC Stack pointer
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 2
+END
+
+REGISTER x3
+  ABBR gp
+  DESC Global pointer
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 3
+END
+
+REGISTER x4
+  ABBR tp
+  DESC Thread pointer
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 4
+END
+
+REGISTER x5
+  ABBR t0
+  DESC Temporary register 0
+  PRESERVE false
+  CALLER true
+  ARG false
+  INDEX 5
+END
+
+REGISTER x6
+  ABBR t1
+  DESC Temporary register 1
+  PRESERVE false
+  CALLER true
+  ARG false
+  INDEX 6
+END
+
+REGISTER x7
+  ABBR t2
+  DESC Temporary register 2
+  PRESERVE false
+  CALLER true
+  ARG false
+  INDEX 7
+END
+
+REGISTER x8
+  ABBR s0
+  DESC Saved register 0 / frame pointer
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 8
+END
+
+REGISTER x9
+  ABBR s1
+  DESC Saved register 1
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 9
+END
+
+REGISTER x10
+  ABBR a0
+  DESC Function argument 0 / return value 0
+  PRESERVE false
+  CALLER true
+  ARG true
+  INDEX 10
+END
+
+REGISTER x11
+  ABBR a1
+  DESC Function argument 1 / return value 1
+  PRESERVE false
+  CALLER true
+  ARG true
+  INDEX 11
+END
+
+REGISTER x12
+  ABBR a2
+  DESC Function argument 2
+  PRESERVE false
+  CALLER true
+  ARG true
+  INDEX 12
+END
+
+REGISTER x13
+  ABBR a3
+  DESC Function argument 3
+  PRESERVE false
+  CALLER true
+  ARG true
+  INDEX 13
+END
+
+REGISTER x14
+  ABBR a4
+  DESC Function argument 4
+  PRESERVE false
+  CALLER true
+  ARG true
+  INDEX 14
+END
+
+REGISTER x15
+  ABBR a5
+  DESC Function argument 5
+  PRESERVE false
+  CALLER true
+  ARG true
+  INDEX 15
+END
+
+REGISTER x16
+  ABBR a6
+  DESC Function argument 6
+  PRESERVE false
+  CALLER true
+  ARG true
+  INDEX 16
+END
+
+REGISTER x17
+  ABBR a7
+  DESC Function argument 7
+  PRESERVE false
+  CALLER true
+  ARG true
+  INDEX 17
+END
+
+REGISTER x18
+  ABBR s2
+  DESC Saved register 2
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 18
+END
+
+REGISTER x19
+  ABBR s3
+  DESC Saved register 3
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 19
+END
+
+REGISTER x20
+  ABBR s4
+  DESC Saved register 4
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 20
+END
+
+REGISTER x21
+  ABBR s5
+  DESC Saved register 5
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 21
+END
+
+REGISTER x22
+  ABBR s6
+  DESC Saved register 6
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 22
+END
+
+REGISTER x23
+  ABBR s7
+  DESC Saved register 7
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 23
+END
+
+REGISTER x24
+  ABBR s8
+  DESC Saved register 8
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 24
+END
+
+REGISTER x25
+  ABBR s9
+  DESC Saved register 9
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 25
+END
+
+REGISTER x26
+  ABBR s10
+  DESC Saved register 10
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 26
+END
+
+REGISTER x27
+  ABBR s11
+  DESC Saved register 11
+  PRESERVE true
+  CALLER false
+  ARG false
+  INDEX 27
+END
+
+REGISTER x28
+  ABBR t3
+  DESC Temporary register 3
+  PRESERVE false
+  CALLER true
+  ARG false
+  INDEX 28
+END
+
+REGISTER x29
+  ABBR t4
+  DESC Temporary register 4
+  PRESERVE false
+  CALLER true
+  ARG false
+  INDEX 29
+END
+
+REGISTER x30
+  ABBR t5
+  DESC Temporary register 5
+  PRESERVE false
+  CALLER true
+  ARG false
+  INDEX 30
+END
+
+REGISTER x31
+  ABBR t6
+  DESC Temporary register 6
+  PRESERVE false
+  CALLER true
+  ARG false
+  INDEX 31
+END