LC_SEGMENT_64 or LC_SEGMENT
Load command 1 cmd LC_SEGMENT_64 cmdsize 712 segname __TEXT vmaddr 0x0000000100000000 vmsize 0x00000000001c6000 fileoff 0 filesize 1859584 maxprot 0x00000007 initprot 0x00000005 nsects 8 flags 0x0
mmap the first 1859584 bytes of this file to 0x100000000 with PROT_READ|PROT_EXEC
Similar to ELF's PT_LOAD