This time the email is perfect :)
On Thu, Jun 06, 2013 at 12:02:52AM +0800, Arthur Chunqi Li wrote:
> Add multibyte NOP test case to kvm-unit-tests. This version adds test cases
> into x86/realmode.c. This can test one of bugs when booting RHEL5.9 64-bit.
>
> Signed-off-by: Arthur Chunqi Li <[email protected]>
> ---
> x86/realmode.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/x86/realmode.c b/x86/realmode.c
> index 981be08..e103ca6 100644
> --- a/x86/realmode.c
> +++ b/x86/realmode.c
> @@ -1504,6 +1504,29 @@ static void test_fninit(void)
> report("fninit", 0, fsw == 0 && (fcw & 0x103f) == 0x003f);
> }
>
> +static void test_nopl(void)
> +{
> + MK_INSN(nopl1, ".byte 0x90\n\r"); // 1 byte nop
> + MK_INSN(nopl2, ".byte 0x66, 0x90\n\r"); // 2 bytes nop
> + MK_INSN(nopl3, ".byte 0x0f, 0x1f, 0x00\n\r"); // 3 bytes nop
> + MK_INSN(nopl4, ".byte 0x0f, 0x1f, 0x40, 0x00\n\r"); // 4 bytes nop
But all nops below that are not supported in 16 bit mode. You can
disassemble realmode.elf in 16bit node (objdump -z -d -mi8086
x86/realmode.elf) and check yourself. Lets not complicate things for now
and test only those that are easy to test.
> + MK_INSN(nopl5, ".byte 0x0f, 0x1f, 0x44, 0x00, 0x00\n\r"); // 5 bytes nop
> + MK_INSN(nopl6, ".byte 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00\n\r"); // 6
> bytes nop
> + MK_INSN(nopl7, ".byte 0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00\n\r");
> // 7 bytes nop
> + MK_INSN(nopl8, ".byte 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00,
> 0x00\n\r"); // 8 bytes nop
> + MK_INSN(nopl9, ".byte 0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00,
> 0x00\n\r"); // 9 bytes nop
> + exec_in_big_real_mode(&insn_nopl1);
> + exec_in_big_real_mode(&insn_nopl2);
> + exec_in_big_real_mode(&insn_nopl3);
> + exec_in_big_real_mode(&insn_nopl4);
> + exec_in_big_real_mode(&insn_nopl5);
> + exec_in_big_real_mode(&insn_nopl6);
> + exec_in_big_real_mode(&insn_nopl7);
> + exec_in_big_real_mode(&insn_nopl8);
> + exec_in_big_real_mode(&insn_nopl9);
> + report("nopl", 0, 1);
> +}
> +
> void realmode_start(void)
> {
> test_null();
> @@ -1548,6 +1571,7 @@ void realmode_start(void)
> test_xlat();
> test_salc();
> test_fninit();
> + test_nopl();
>
> exit(0);
> }
> --
> 1.7.9.5
--
Gleb.
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