Symbol Table Error Table

mode     defbyset     defbyentry  Error
a        0            0           1
a        0            1           1
a        1            0           0
a        1            1           1

r        0            0           0
r        0            1           0
r        1            0           1
r        1            1           1

u        0            0           0
u        0            1           1
u        1            0           1
u        1            1           1

• absolute symbols can be updated if defined by set
• relocatable symbols can only be updated 1 time as defbyentry
• undefined symbols cannot be updated