Symbol: REX_B
sys/arch/amd64/amd64/db_disasm.c
866
#define f_rm(byte, rex) (((byte)&0x7) + REX_B(rex))
sys/arch/amd64/amd64/db_disasm.c
870
#define sib_base(byte, rex) (((byte)&0x7) + REX_B(rex))