[PATCH v5 resend 1/4] include: Define fast fail codes and the __fastfail() intrinsic.
Thomas Faber
thomas.faber at reactos.org
Wed Jan 19 11:49:00 CST 2022
Hi,
On 2022-01-19 12:06, Jinoh Kang wrote:
> +#if defined(__GNUC__)
> +#if defined(__x86_64__)
> +static FORCEINLINE DECLSPEC_NORETURN void __fastfail(unsigned int code)
> +{
> + register ULONGLONG val __asm__("rcx") = code;
> + __asm__ __volatile__( "int $0x29" :: "r" (val) : "memory" );
Any reason to prefer this "manual move" into a register over specifying
r/ecx as an input into the assembly block? I.e.
__asm__ __volatile__( "int $0x29" :: "c" ((ULONG_PTR)code) : "memory" );
As an added bonus, that would make the function identical between x64
and x86.
(The cast to ULONG_PTR is to make the compiler aware that the upper bits
of rcx _must_ be zero, rather than just letting it happen incidentally.)
Something similar might be applicable to ARM, too, but I'm not sure.
Thanks,
Thomas
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