diff mbox series

[v5,04/19] nat/x86-cpuid.h: Add x86_cpuid_count wrapper around __get_cpuid_count.

Message ID 20230427210113.45380-5-jhb@FreeBSD.org
State New
Headers
Series Handle variable XSAVE layouts |

Commit Message

John Baldwin April 27, 2023, 9 p.m. UTC 
  ---
 gdb/nat/x86-cpuid.h | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
diff mbox series

Patch

diff --git a/gdb/nat/x86-cpuid.h b/gdb/nat/x86-cpuid.h
index 0955afba577..517113d45e8 100644
--- a/gdb/nat/x86-cpuid.h
+++ b/gdb/nat/x86-cpuid.h
@@ -48,6 +48,30 @@  x86_cpuid (unsigned int __level,
   return __get_cpuid (__level, __eax, __ebx, __ecx, __edx);
 }
 
+/* Return cpuid data for requested cpuid level and sub-level, as found
+   in returned eax, ebx, ecx and edx registers.  The function checks
+   if cpuid is supported and returns 1 for valid cpuid information or
+   0 for unsupported cpuid level.  Pointers may be non-null.  */
+
+static __inline int
+x86_cpuid_count (unsigned int __level, unsigned int __sublevel,
+		 unsigned int *__eax, unsigned int *__ebx,
+		 unsigned int *__ecx, unsigned int *__edx)
+{
+  unsigned int __scratch;
+
+  if (__eax == nullptr)
+    __eax = &__scratch;
+  if (__ebx == nullptr)
+    __ebx = &__scratch;
+  if (__ecx == nullptr)
+    __ecx = &__scratch;
+  if (__edx == nullptr)
+    __edx = &__scratch;
+
+  return __get_cpuid_count (__level, __sublevel, __eax, __ebx, __ecx, __edx);
+}
+
 #else
 
 static __inline int
@@ -58,6 +82,14 @@  x86_cpuid (unsigned int __level,
   return 0;
 }
 
+static __inline int
+x86_cpuid_count (unsigned int __level, unsigned int __sublevel,
+		 unsigned int *__eax, unsigned int *__ebx,
+		 unsigned int *__ecx, unsigned int *__edx)
+{
+  return 0;
+}
+
 #endif /* i386 && x86_64 */
 
 #endif /* NAT_X86_CPUID_H */