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[VCRUNTIME] Fix string I/O inline asm (#8743)

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Avoid clobbering buffer operands when performing string I/O operations.

CORE-20078, CORE-16216, CORE-17977
This commit is contained in:
Dmitry Borisov
2026-04-08 22:22:24 +06:00
committed by GitHub
parent bad308a34d
commit 655d3ee756
1 changed files with 30 additions and 12 deletions
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42
sdk/include/vcruntime/mingw32/intrin_x86.h
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@@ -1556,9 +1556,9 @@ __INTRIN_INLINE void __inbytestring(unsigned short Port, unsigned char * Buffer,
{
__asm__ __volatile__
(
"rep; insb" :
[Buffer] "=D" (Buffer), [Count] "=c" (Count) :
"d" (Port), "[Buffer]" (Buffer), "[Count]" (Count) :
"rep insb" :
"+D" (Buffer), "+c" (Count) :
"d" (Port) :
"memory"
);
}
@@ -1567,9 +1567,9 @@ __INTRIN_INLINE void __inwordstring(unsigned short Port, unsigned short * Buffer
{
__asm__ __volatile__
(
"rep; insw" :
[Buffer] "=D" (Buffer), [Count] "=c" (Count) :
"d" (Port), "[Buffer]" (Buffer), "[Count]" (Count) :
"rep insw" :
"+D" (Buffer), "+c" (Count) :
"d" (Port) :
"memory"
);
}
@@ -1578,9 +1578,9 @@ __INTRIN_INLINE void __indwordstring(unsigned short Port, unsigned long * Buffer
{
__asm__ __volatile__
(
"rep; insl" :
[Buffer] "=D" (Buffer), [Count] "=c" (Count) :
"d" (Port), "[Buffer]" (Buffer), "[Count]" (Count) :
"rep insl" :
"+D" (Buffer), "+c" (Count) :
"d" (Port) :
"memory"
);
}
@@ -1602,17 +1602,35 @@ __INTRIN_INLINE void __outdword(unsigned short Port, unsigned long Data)
__INTRIN_INLINE void __outbytestring(unsigned short Port, unsigned char * Buffer, unsigned long Count)
{
__asm__ __volatile__("rep; outsb" : : [Port] "d" (Port), [Buffer] "S" (Buffer), "c" (Count));
__asm__ __volatile__
(
"rep outsb" :
"+S" (Buffer), "+c" (Count) :
"d" (Port) :
"memory"
);
}
__INTRIN_INLINE void __outwordstring(unsigned short Port, unsigned short * Buffer, unsigned long Count)
{
__asm__ __volatile__("rep; outsw" : : [Port] "d" (Port), [Buffer] "S" (Buffer), "c" (Count));
__asm__ __volatile__
(
"rep outsw" :
"+S" (Buffer), "+c" (Count) :
"d" (Port) :
"memory"
);
}
__INTRIN_INLINE void __outdwordstring(unsigned short Port, unsigned long * Buffer, unsigned long Count)
{
__asm__ __volatile__("rep; outsl" : : [Port] "d" (Port), [Buffer] "S" (Buffer), "c" (Count));
__asm__ __volatile__
(
"rep outsl" :
"+S" (Buffer), "+c" (Count) :
"d" (Port) :
"memory"
);
}
__INTRIN_INLINE int __cdecl _inp(unsigned short Port)