From c85c5c408af0996daa5f807c488f921e7e7ad524 Mon Sep 17 00:00:00 2001
From: Andy Polyakov <appro@openssl.org>
Date: Thu, 9 Sep 2004 14:50:32 +0000
Subject: x86 assembler updates: more instructions, new OPENSSL_instrument_halt
 [for DJGPP]...

---
 crypto/perlasm/x86ms.pl   |  6 ++++--
 crypto/perlasm/x86nasm.pl |  6 ++++--
 crypto/perlasm/x86unix.pl |  6 ++++--
 crypto/x86cpuid.pl        | 34 ++++++++++++++++++++++++++++++++++
 4 files changed, 46 insertions(+), 6 deletions(-)

diff --git a/crypto/perlasm/x86ms.pl b/crypto/perlasm/x86ms.pl
index 1de1277920..3764760585 100644
--- a/crypto/perlasm/x86ms.pl
+++ b/crypto/perlasm/x86ms.pl
@@ -133,6 +133,7 @@ sub main'xorb	{ &out2("xor",@_); }
 sub main'add	{ &out2("add",@_); }
 sub main'adc	{ &out2("adc",@_); }
 sub main'sub	{ &out2("sub",@_); }
+sub main'sbb	{ &out2("sbb",@_); }
 sub main'rotl	{ &out2("rol",@_); }
 sub main'rotr	{ &out2("ror",@_); }
 sub main'exch	{ &out2("xchg",@_); }
@@ -160,8 +161,8 @@ sub main'jne	{ &out1("jne",@_); }
 sub main'jno	{ &out1("jno",@_); }
 sub main'push	{ &out1("push",@_); $stack+=4; }
 sub main'pop	{ &out1("pop",@_); $stack-=4; }
-sub main'pushf	{ &out0("pushf"); $stack+=4; }
-sub main'popf	{ &out0("popf"); $stack-=4; }
+sub main'pushf	{ &out0("pushfd"); $stack+=4; }
+sub main'popf	{ &out0("popfd"); $stack-=4; }
 sub main'bswap	{ &out1("bswap",@_); &using486(); }
 sub main'not	{ &out1("not",@_); }
 sub main'call	{ &out1("call",($_[0]=~/^\$L/?'':'_').$_[0]); }
@@ -172,6 +173,7 @@ sub main'bt	{ &out2("bt",@_); }
 sub main'leave	{ &out0("leave"); }
 sub main'cpuid  { &out0("DW\t0A20Fh"); }
 sub main'rdtsc  { &out0("DW\t0310Fh"); }
+sub main'halt	{ &out0("hlt"); }
 
 # SSE2
 sub main'emms	{ &out0("emms"); }
diff --git a/crypto/perlasm/x86nasm.pl b/crypto/perlasm/x86nasm.pl
index b02de6452a..27080a0f83 100644
--- a/crypto/perlasm/x86nasm.pl
+++ b/crypto/perlasm/x86nasm.pl
@@ -147,6 +147,7 @@ sub main'xorb	{ &out2("xor",@_); }
 sub main'add	{ &out2("add",@_); }
 sub main'adc	{ &out2("adc",@_); }
 sub main'sub	{ &out2("sub",@_); }
+sub main'sbb	{ &out2("sbb",@_); }
 sub main'rotl	{ &out2("rol",@_); }
 sub main'rotr	{ &out2("ror",@_); }
 sub main'exch	{ &out2("xchg",@_); }
@@ -178,8 +179,8 @@ sub main'jno	{ &out1("jno $near",@_); }
 
 sub main'push	{ &out1("push",@_); $stack+=4; }
 sub main'pop	{ &out1("pop",@_); $stack-=4; }
-sub main'pushf	{ &out0("pushf"); $stack+=4; }
-sub main'popf	{ &out0("popf"); $stack-=4; }
+sub main'pushf	{ &out0("pushfd"); $stack+=4; }
+sub main'popf	{ &out0("popfd"); $stack-=4; }
 sub main'bswap	{ &out1("bswap",@_); &using486(); }
 sub main'not	{ &out1("not",@_); }
 sub main'call	{ &out1("call",($_[0]=~/^\@L/?'':$under).$_[0]); }
@@ -190,6 +191,7 @@ sub main'bt	{ &out2("bt",@_); }
 sub main'leave	{ &out0("leave"); }
 sub main'cpuid	{ &out0("cpuid"); }
 sub main'rdtsc	{ &out0("rdtsc"); }
+sub main'halt	{ &out0("hlt"); }
 
 # SSE2
 sub main'emms	{ &out0("emms"); }
diff --git a/crypto/perlasm/x86unix.pl b/crypto/perlasm/x86unix.pl
index c34cd74b7a..79c1abb99d 100644
--- a/crypto/perlasm/x86unix.pl
+++ b/crypto/perlasm/x86unix.pl
@@ -164,6 +164,7 @@ sub main'xorb	{ &out2("xorb",@_); }
 sub main'add	{ &out2("addl",@_); }
 sub main'adc	{ &out2("adcl",@_); }
 sub main'sub	{ &out2("subl",@_); }
+sub main'sbb	{ &out2("sbbl",@_); }
 sub main'rotl	{ &out2("roll",@_); }
 sub main'rotr	{ &out2("rorl",@_); }
 sub main'exch	{ &out2("xchg",@_); }
@@ -191,8 +192,8 @@ sub main'dec	{ &out1("decl",@_); }
 sub main'inc	{ &out1("incl",@_); }
 sub main'push	{ &out1("pushl",@_); $stack+=4; }
 sub main'pop	{ &out1("popl",@_); $stack-=4; }
-sub main'pushf	{ &out0("pushf"); $stack+=4; }
-sub main'popf	{ &out0("popf"); $stack-=4; }
+sub main'pushf	{ &out0("pushfl"); $stack+=4; }
+sub main'popf	{ &out0("popfl"); $stack-=4; }
 sub main'not	{ &out1("notl",@_); }
 sub main'call	{	my $pre=$under;
 			foreach $i (%label)
@@ -206,6 +207,7 @@ sub main'bt	{ &out2("btl",@_); }
 sub main'leave	{ &out0("leave"); }
 sub main'cpuid	{ &out0(".word\t0xa20f"); }
 sub main'rdtsc	{ &out0(".word\t0x310f"); }
+sub main'halt	{ &out0("hlt"); }
 
 # SSE2
 sub main'emms	{ &out0("emms"); }
diff --git a/crypto/x86cpuid.pl b/crypto/x86cpuid.pl
index da3e5bcaca..894c49c0a3 100644
--- a/crypto/x86cpuid.pl
+++ b/crypto/x86cpuid.pl
@@ -38,6 +38,40 @@ require "x86asm.pl";
 	&ret	();
 &function_end_B("OPENSSL_rdtsc");
 
+# This works in Ring 0 only [read DJGPP+MS-DOS+privileged DPMI host],
+# but it's safe to call it on any [supported] 32-bit platform...
+# Just check for [non-]zero return value...
+&function_begin_B("OPENSSL_instrument_halt","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
+	&picmeup("ecx","OPENSSL_ia32cap_P");
+	&bt	(&DWP(0,"ecx"),4);
+	&jnc	(&label("nohalt"));	# no TSC
+
+	&data_word(0x9058900e);		# push %cs; pop %eax
+	&and	("eax",3);
+	&jnz	(&label("nohalt"));	# not enough privileges
+
+	&pushf	();
+	&pop	("eax")
+	&bt	("eax",9);
+	&jnc	(&label("nohalt"));	# interrupts are disabled
+
+	&rdtsc	();
+	&push	("edx");
+	&push	("eax");
+	&halt	();
+	&rdtsc	();
+
+	&sub	("eax",&DWP(0,"esp"));
+	&sbb	("edx",&DWP(4,"esp"));
+	&add	("esp",8);
+	&ret	();
+
+&set_label("nohalt");
+	&xor	("eax","eax");
+	&xor	("edx","edx");
+	&ret	();
+&function_end_B("OPENSSL_instrument_halt");
+
 &initseg("OPENSSL_cpuid_setup");
 
 &asm_finish();
-- 
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