x86: msr: fix bogus return values from rdmsr_safe/wrmsr_safe

Impact: bogus error codes (+other?) on x86-64

The rdmsr_safe/wrmsr_safe routines have macros for the handling of the
edx:eax arguments.  Those macros take a variable number of assembly
arguments.  This is rather inherently incompatible with using
%digit-style escapes in the inline assembly; replace those with
%[name]-style escapes.

This fixes miscompilation on x86-64, which at the very least caused
bogus return values.  It is possible that this could also corrupt the
return value; I am not sure.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 8 insertions, 8 deletions

diff --git a/include/asm-x86/msr.h b/include/asm-x86/msr.h
index ad5f2decf7f7..2362cfda1fbc 100644
--- a/include/asm-x86/msr.h
+++ b/include/asm-x86/msr.h
@@ -52,14 +52,14 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr,
 {
         DECLARE_ARGS(val, low, high);
 
-        asm volatile("2: rdmsr ; xor %0,%0\n"
+        asm volatile("2: rdmsr ; xor %[err],%[err]\n"
                      "1:\n\t"
                      ".section .fixup,\"ax\"\n\t"
-                     "3:  mov %3,%0 ; jmp 1b\n\t"
+                     "3:  mov %[fault],%[err] ; jmp 1b\n\t"
                      ".previous\n\t"
                      _ASM_EXTABLE(2b, 3b)
-                     : "=r" (*err), EAX_EDX_RET(val, low, high)
-                     : "c" (msr), "i" (-EFAULT));
+                     : [err] "=r" (*err), EAX_EDX_RET(val, low, high)
+                     : "c" (msr), [fault] "i" (-EFAULT));
         return EAX_EDX_VAL(val, low, high);
 }
 
@@ -73,15 +73,15 @@ static inline int native_write_msr_safe(unsigned int msr,
                                         unsigned low, unsigned high)
 {
         int err;
-        asm volatile("2: wrmsr ; xor %0,%0\n"
+        asm volatile("2: wrmsr ; xor %[err],%[err]\n"
                      "1:\n\t"
                      ".section .fixup,\"ax\"\n\t"
-                     "3:  mov %4,%0 ; jmp 1b\n\t"
+                     "3:  mov %[fault],%[err] ; jmp 1b\n\t"
                      ".previous\n\t"
                      _ASM_EXTABLE(2b, 3b)
-                     : "=a" (err)
+                     : [err] "=a" (err)
                      : "c" (msr), "0" (low), "d" (high),
-                       "i" (-EFAULT)
+                       [fault] "i" (-EFAULT)
                      : "memory");
         return err;
 }