Avi Kivity wrote on 2013-02-20:
> On Wed, Feb 20, 2013 at 3:10 PM, Zhang, Yang Z <[email protected]>
> wrote:
>>>>>
>>>>> push %%cs
>>>> "push %%cs" is invalid in x86_64.
>>>
>>> Oops. 'push[lq] $__KERNEL_CS' then.
>> Is this right? Just copy it from other file.
>>
>> #define __STR(X) #X
>> #define STR(X) __STR(X)
>>
>> #ifdef CONFIG_X86_64
>> "pushq $"STR(__KERNEL_CS)" \n\t" #else "pushl
>> $"STR(__KERNEL_CS)" \n\t"
>> #endif
>>
>> #undef STR
>> #undef __STR
>>
>
> Use __ASM_SIZE and an immediate operand for __KERNEL_CS:
>
> asm ( ... : : [cs]"i"(__KERNEL_CS) );
> and the code will be cleaner.
Thanks. Here is code after changing, please review it:
asm(
"mov %0, %%" _ASM_DX " \n\t"
#ifdef CONFIG_X86_64
"mov %%" _ASM_SP ", %%" _ASM_BX " \n\t"
"and $0xfffffffffffffff0, %%" _ASM_SP " \n\t"
"mov %%ss, %%" _ASM_AX " \n\t"
"push %%" _ASM_AX " \n\t"
"push %%" _ASM_BX " \n\t"
#endif
"pushf \n\t"
"orl $0x200, (%%" _ASM_SP ") \n\t"
__ASM_SIZE(push) " %c[cs] \n\t"
"call *%% " _ASM_DX " \n\t"
: : "m"(entry), [cs]"i"(__KERNEL_CS) :
#ifdef CONFIG_X86_64
"rax", "rbx", "rdx"
#else
"edx"
#endif
);
Best regards,
Yang
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