x86[_64]cpuid.pl: add low-level RDSEED.

crypto/perlasm/x86_64-xlate.pl

@@ -778,6 +778,19 @@ my $rdrand = sub {
     }
 };
 
+my $rdseed = sub {
+    if (shift =~ /%[er](\w+)/) {
+      my @opcode=();
+      my $dst=$1;
+	if ($dst !~ /[0-9]+/) { $dst = $regrm{"%e$dst"}; }
+	rex(\@opcode,0,$1,8);
+	push @opcode,0x0f,0xc7,0xf8|($dst&7);
+	@opcode;
+    } else {
+	();
+    }
+};
+
 sub rxb {
  local *opcode=shift;
  my ($dst,$src1,$src2,$rxb)=@_;

crypto/perlasm/x86asm.pl

@@ -131,6 +131,14 @@ sub ::rdrand
     {	&::generic("rdrand",@_);	}
 }
 
+sub ::rdseed
+{ my ($dst)=@_;
+    if ($dst =~ /(e[a-dsd][ixp])/)
+    {	&::data_byte(0x0f,0xc7,0xf8|$regrm{$dst});	}
+    else
+    {	&::generic("rdrand",@_);	}
+}
+
 sub rxb {
  local *opcode=shift;
  my ($dst,$src1,$src2,$rxb)=@_;

crypto/x86_64cpuid.pl

@@ -379,6 +379,21 @@ OPENSSL_ia32_rdrand:
 	cmove	%rcx,%rax
 	ret
 .size	OPENSSL_ia32_rdrand,.-OPENSSL_ia32_rdrand
+
+.globl	OPENSSL_ia32_rdseed
+.type	OPENSSL_ia32_rdseed,\@abi-omnipotent
+.align	16
+OPENSSL_ia32_rdseed:
+	mov	\$8,%ecx
+.Loop_rdseed:
+	rdseed	%rax
+	jc	.Lbreak_rdseed
+	loop	.Loop_rdseed
+.Lbreak_rdseed:
+	cmp	\$0,%rax
+	cmove	%rcx,%rax
+	ret
+.size	OPENSSL_ia32_rdseed,.-OPENSSL_ia32_rdseed
 ___
 
 close STDOUT;	# flush

crypto/x86cpuid.pl

@@ -469,6 +469,18 @@ my $max = "ebp";
 	&ret	();
 &function_end_B("OPENSSL_ia32_rdrand");
 
+&function_begin_B("OPENSSL_ia32_rdseed");
+	&mov	("ecx",8);
+&set_label("loop");
+	&rdseed	("eax");
+	&jc	(&label("break"));
+	&loop	(&label("loop"));
+&set_label("break");
+	&cmp	("eax",0);
+	&cmove	("eax","ecx");
+	&ret	();
+&function_end_B("OPENSSL_ia32_rdseed");
+
 &initseg("OPENSSL_cpuid_setup");
 
 &hidden("OPENSSL_cpuid_setup");