SB-VM:*STATIC-SYMBOLS*
SB-VM:*CONTROL-STACK-START* ; safe, bound at thread entry
SB-VM:*READ-ONLY-SPACE-FREE-POINTER*
SB-VM:*BINDING-STACK-START* ; safe, bound at thread entry
SB-VM:*CONTROL-STACK-END* ; safe, bound at thread entry
SB-VM:*STATIC-SYMBOLS*
SB-VM:*CONTROL-STACK-START* ; safe, bound at thread entry
SB-VM:*READ-ONLY-SPACE-FREE-POINTER*
SB-VM:*BINDING-STACK-START* ; safe, bound at thread entry
SB-VM:*CONTROL-STACK-END* ; safe, bound at thread entry