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lib/x86/cpu_features: add missing earlyclobber constraint for cpuid on i386

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In cpuid() in the '__i386__ && __PIC__' case, the second output operand
is written to before the input operands are used.  So the second output
operand needs the earlyclobber constraint.
This commit is contained in:
Eric Biggers 2020-10-04 22:11:19 -07:00
parent 9702f9fa86
commit 82037908c7
1 changed files with 1 additions and 1 deletions
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lib/x86/cpu_features.c
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@ -34,7 +34,7 @@ volatile u32 _cpu_features = 0;
/* With old GCC versions we have to manually save and restore the x86_32 PIC /* With old GCC versions we have to manually save and restore the x86_32 PIC
* register (ebx). See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47602 */ * register (ebx). See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47602 */
#if defined(__i386__) && defined(__PIC__) #if defined(__i386__) && defined(__PIC__)
# define EBX_CONSTRAINT "=r" # define EBX_CONSTRAINT "=&r"
#else #else
# define EBX_CONSTRAINT "=b" # define EBX_CONSTRAINT "=b"
#endif #endif