Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All
Expand Minimize
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

__readgsbyte, __readgsdword, __readgsqword, __readgsword

Microsoft Specific

Read memory from a location specified by an offset relative to the beginning of the GS segment.

unsigned char __readgsbyte( 
   unsigned long Offset 
unsigned short __readgsword( 
   unsigned long Offset 
unsigned long __readgsdword( 
   unsigned long Offset
unsigned __int64 __readgsqword( 
   unsigned long Offset 


[in] Offset

The offset from the beginning of GS to read from.

The memory contents of the byte, word, double word, or quadword (as indicated by the name of the function called) at the location GS:[Offset].

Intrinsic Architecture









Header file <intrin.h>

These intrinsics are only available in kernel mode, and the routines are only available as intrinsics.

END Microsoft Specific

Community Additions

© 2015 Microsoft