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I was looking at the header of some elf files and noticed something odd:

ELF Header:
  Magic:   7f 45 4c 46 01 02 01 00 00 00 00 00 00 00 00 00 
  Class:                             ELF32
  Data:                              2's complement, big endian
  Version:                           1 (current)
  OS/ABI:                            UNIX - System V
  ABI Version:                       0
  Type:                              EXEC (Executable file)
  Machine:                           MIPS R3000
  Version:                           0x1
  ...
  Flags:                             0x80000027, noreorder, pic, cpic, abi2, mips64r2
  ...

Why is it labeled as ELF32 but have a mips64r2 flag? What does that indicate? Does it mean that the file was compiled as a 32 bit program intended to be run on a 64 bit processor?

Also, if it is running on mips64r2, why is the machine labeled as MIPS r3000?

If I wanted to run this with qemu, what type of environment would I need? mips64 r2? mips r3000?

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