On Wed, Jul 28, 2010 at 12:39:01PM +0300, Mohammed Gamal wrote:
> This adds a unit test for real mode emulation of the iret instruction
>
> Signed-off-by: Mohammed Gamal <m.gamal005@xxxxxxxxx>
>
> ---
> Changes from v1:
> - Added test for 16-bit iret
> - Added tests for returned eflags
> ---
> kvm/test/x86/realmode.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 79 insertions(+), 0 deletions(-)
>
> diff --git a/kvm/test/x86/realmode.c b/kvm/test/x86/realmode.c
> index bd79348..74456c3 100644
> --- a/kvm/test/x86/realmode.c
> +++ b/kvm/test/x86/realmode.c
> @@ -865,6 +865,84 @@ void test_pusha_popa()
> print_serial("Pusha/Popa Test2: PASS\n");
> }
>
> +void test_iret()
> +{
> + struct regs inregs = { 0 }, outregs;
> +
> + MK_INSN(iret32, "pushf\n\t"
> + "pushl %cs\n\t"
> + "call 1f\n\t" /* a near call will push eip onto the stack */
> + "jmp 2f\n\t"
> + "1: iret\n\t"
> + "2:\n\t"
> + );
> +
> + MK_INSN(iret16, "pushfw\n\t"
> + "pushw %cs\n\t"
> + "callw 1f\n\t"
> + "jmp 2f\n\t"
> + "1: iretw\n\t"
> + "2:\n\t");
Unless iret causes a task switch, it will not cause an exit.
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