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The stack can be 32-bit even in real mode, and in this case the stack pointer must be updated in its entirety rather than just the bottom 16 bits. The same is true of real mode IRET, for which there was even a comment suggesting the right thing to do. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1506 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>