QEMU not support 32-bit stack in unreal/flat/big 32-bit mode

QEMU not support 32-bit stack in unreal/flat/big 32-bit mode. Bochs support this special mode.

Description of flat/unreal mode: After switching to protected 32-bit mode (CS <- 32 segment) the program returns to real mode but does not reload the segment to 16-bit, it stays in this mode. This is 32-bit real mode and the only restriction is that you cannot run any procedure above an address greater than 64K. The same is true for a 32-bit stack in this mode. Reloading the 32-bit D-bit SS selector is preserved when switching from protected mode to 32-bit real mode and after "POP EAX" when ESP was = 0xFFFC makes ESP=0x10000 but not 0x0000.

Try run attached program with command line param "/?" FFEUN.7Z

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