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intrin.h: Implement __readmsr, __readcr3, and __writecr3 

Fixes PR19301.

Based on a patch from Steven Graf!

llvm-svn: 205751
This commit is contained in:
Reid Kleckner 2014-04-08 00:28:22 +00:00
parent 86e70cb3ac
commit 592dc61acf
1 changed files with 35 additions and 0 deletions
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35
clang/lib/Headers/Intrin.h
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@ -105,6 +105,7 @@ unsigned __int64 __rdtsc(void);
unsigned __int64 __rdtscp(unsigned int *);
unsigned long __readcr0(void);
unsigned long __readcr2(void);
static __inline__
unsigned long __readcr3(void);
unsigned long __readcr4(void);
unsigned long __readcr8(void);
@ -119,6 +120,7 @@ unsigned __int64 __readfsqword(unsigned long);
static __inline__
unsigned short __readfsword(unsigned long);
#endif
static __inline__
unsigned __int64 __readmsr(unsigned long);
unsigned __int64 __readpmc(unsigned long);
unsigned long __segmentlimit(unsigned long);
@ -143,6 +145,7 @@ void __vmx_off(void);
void __vmx_vmptrst(unsigned __int64 *);
void __wbinvd(void);
void __writecr0(unsigned int);
static __inline__
void __writecr3(unsigned int);
void __writecr4(unsigned int);
void __writecr8(unsigned int);
@ -981,6 +984,38 @@ __halt(void) {
__asm__ volatile ("hlt");
}
/*----------------------------------------------------------------------------*\
|* Privileged intrinsics
\*----------------------------------------------------------------------------*/
static __inline__ unsigned __int64 __attribute__((__always_inline__, __nodebug__))
__readmsr(unsigned long __register) {
// Loads the contents of a 64-bit model specific register (MSR) specified in
// the ECX register into registers EDX:EAX. The EDX register is loaded with
// the high-order 32 bits of the MSR and the EAX register is loaded with the
// low-order 32 bits. If less than 64 bits are implemented in the MSR being
// read, the values returned to EDX:EAX in unimplemented bit locations are
// undefined.
unsigned long __edx;
unsigned long __eax;
__asm__ ("rdmsr"
: "=d"(__edx), "=a"(__eax)
: "c"(__register)
: "%ecx", "%edx", "%eax");
return (((unsigned __int64)__edx) << 32) | (unsigned __int64)__eax;
}
static __inline__ unsigned long __attribute__((always_inline, __nodebug__))
__readcr3(void) {
unsigned long value;
__asm__ __volatile__("mov %%cr3, %0" : "=q"(value));
return value;
}
static __inline__ void __attribute__((always_inline, __nodebug__))
__writecr3(unsigned int Data) {
__asm__("mov %0, %%cr3" : : "q"(Data) : "memory");
}
#ifdef __cplusplus
}
#endif