From: Nikos Mavrogiannopoulos <nmav@gnutls.org>
Date: Fri, 16 Sep 2011 20:46:13 +0000 (+0200)
Subject: Added better detection of capabilities in 386. If cpuid doesn't exist don't try to... 
X-Git-Tag: gnutls_3_0_3~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8c99c59b4a09f8ade727bfb3276807d72961108;p=thirdparty%2Fgnutls.git

Added better detection of capabilities in 386. If cpuid doesn't exist don't try to execute it.
---

diff --git a/configure.ac b/configure.ac
index 85916ef627..a3ccb2cc91 100644
--- a/configure.ac
+++ b/configure.ac
@@ -94,8 +94,8 @@ esac
 
 fi
 
-AM_CONDITIONAL(TRY_X86_OPTIMIZATIONS, test x"$hw_accel" = x"x86" || test x"$hw_accel" = x"x86-64")
 AM_CONDITIONAL(ASM_X86_64, test x"$hw_accel" = x"x86-64")
+AM_CONDITIONAL(ASM_X86_32, test x"$hw_accel" = x"x86")
 AM_CONDITIONAL(HAVE_GCC_GNU89_INLINE_OPTION, test "$gnu89_inline" = "yes"])
 AM_CONDITIONAL(HAVE_GCC, test "$GCC" = "yes")
 
diff --git a/lib/accelerated/Makefile.am b/lib/accelerated/Makefile.am
index 4a23dde76f..e9426d0be6 100644
--- a/lib/accelerated/Makefile.am
+++ b/lib/accelerated/Makefile.am
@@ -36,8 +36,14 @@ EXTRA_DIST = x86.h accelerated.h cryptodev.h
 libaccelerated_la_SOURCES = accelerated.c cryptodev.c
 libaccelerated_la_LIBADD =
 
-if TRY_X86_OPTIMIZATIONS
+if ASM_X86_64
 SUBDIRS += intel
-AM_CFLAGS += -DTRY_X86_OPTIMIZATIONS
+AM_CFLAGS += -DASM_X86_64
+libaccelerated_la_LIBADD += intel/libintel.la
+endif
+
+if ASM_X86_32
+SUBDIRS += intel
+AM_CFLAGS += -DASM_X86_32
 libaccelerated_la_LIBADD += intel/libintel.la
 endif
diff --git a/lib/accelerated/accelerated.c b/lib/accelerated/accelerated.c
index ddfdf0c54a..e2da12f6c3 100644
--- a/lib/accelerated/accelerated.c
+++ b/lib/accelerated/accelerated.c
@@ -21,16 +21,20 @@
  */
 
 #include <accelerated.h>
-#ifdef TRY_X86_OPTIMIZATIONS
+#if defined(ASM_X86_32) || defined(ASM_X86_64)
 # include <intel/aes-x86.h>
+# include <x86.h>
 #endif
 
 void _gnutls_register_accel_crypto(void)
 {
 
-#ifdef TRY_X86_OPTIMIZATIONS
-  register_x86_crypto ();
-  register_padlock_crypto ();
+#if defined(ASM_X86_32) || defined(ASM_X86_64)
+  if (have_cpuid() != 0)
+    {
+      register_x86_crypto ();
+      register_padlock_crypto ();
+    }
 #endif
 
   return;
diff --git a/lib/accelerated/x86.h b/lib/accelerated/x86.h
index 2fdb9d6c79..0b61272cda 100644
--- a/lib/accelerated/x86.h
+++ b/lib/accelerated/x86.h
@@ -22,19 +22,25 @@
 
 #include <config.h>
 
-#ifdef HAVE_CPUID_H
-# include <cpuid.h>
-# define cpuid __cpuid
+#ifdef ASM_X86_64
 
-#else
-
-# ifdef ASM_X86_64
+# ifdef HAVE_CPUID_H
+#  include <cpuid.h>
+#  define cpuid __cpuid
+# else
 
-#  define cpuid(func,ax,bx,cx,dx)\
+#define cpuid(func,ax,bx,cx,dx)\
   __asm__ __volatile__ ("cpuid":\
   "=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) : "a" (func));
 
-# else
+# endif
+
+# define have_cpuid() 1
+
+#endif /* ASM_X86_64 */
+
+
+#ifdef ASM_X86_32
 /* some GCC versions complain on the version above */
 #  define cpuid(func, a, b, c, d) g_cpuid(func, &a, &b, &c, &d)
 
@@ -48,6 +54,23 @@ inline static void g_cpuid(uint32_t func, unsigned int *ax, unsigned int *bx, un
                   :"a"(func)
                   :"cc");
 }
-# endif
 
-#endif
+inline static unsigned int have_cpuid(void)
+{
+  unsigned int have_id;
+  asm volatile(
+    "pushfl\t\n"
+    "pop %0\t\n"
+    "orl $0x200000, %0\t\n"
+    "push %0\t\n"
+    "popfl\t\n"
+    "pushfl\t\n"
+    "pop %0\t\n"
+    "andl $0x200000, %0\t\n"
+    :"=r" (have_id)
+    ::
+  );
+  
+  return have_id;
+}
+#endif /* ASM_X86_32 */