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Add implementations of __readfs{byte,word,dword,qword} to Intrin.h 

Differential Revision: http://llvm-reviews.chandlerc.com/D2606

llvm-svn: 199958
This commit is contained in:
Hans Wennborg 2014-01-24 00:52:39 +00:00
parent 72553fc19b
commit 74ca0c4105
1 changed files with 33 additions and 0 deletions
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33
clang/lib/Headers/Intrin.h
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@ -101,10 +101,16 @@ unsigned long __readcr5(void);
unsigned long __readcr8(void);
unsigned int __readdr(unsigned int);
unsigned int __readeflags(void);
#ifdef __i386__
static __inline__
unsigned char __readfsbyte(unsigned long);
static __inline__
unsigned long __readfsdword(unsigned long);
static __inline__
unsigned __int64 __readfsqword(unsigned long);
static __inline__
unsigned short __readfsword(unsigned long);
#endif
unsigned __int64 __readmsr(unsigned long);
unsigned __int64 __readpmc(unsigned long);
unsigned long __segmentlimit(unsigned long);
@ -767,6 +773,33 @@ _WriteBarrier(void) {
__asm__ volatile ("" : : : "memory");
}
/*----------------------------------------------------------------------------*\
|* readfs
|* (Pointers in address space #257 are relative to the FS segment register.)
\*----------------------------------------------------------------------------*/
#ifdef __i386__
#define __ptr_to_addr_space(__addr_space_nbr, __type, __offset) \
((volatile __type __attribute__((__address_space__(__addr_space_nbr)))*) \
(__offset))
static __inline__ unsigned char __attribute__((__always_inline__, __nodebug__))
__readfsbyte(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned char, __offset);
}
static __inline__ unsigned long __attribute__((__always_inline__, __nodebug__))
__readfsdword(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned long, __offset);
}
static __inline__ unsigned __int64 __attribute__((__always_inline__, __nodebug__))
__readfsqword(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned __int64, __offset);
}
static __inline__ unsigned short __attribute__((__always_inline__, __nodebug__))
__readfsword(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned short, __offset);
}
#undef __ptr_to_addr_space
#endif
/*----------------------------------------------------------------------------*\
|* Misc
\*----------------------------------------------------------------------------*/
static __inline__ void * __attribute__((__always_inline__, __nodebug__))