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#!/usr/bin/env perl
push(@INC,"perlasm");
require "x86asm.pl";
&asm_init($ARGV[0],"x86cpuid");
for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
&function_begin("OPENSSL_ia32_cpuid");
&xor ("edx","edx");
&pushf ();
&pop ("eax");
&mov ("ecx","eax");
&xor ("eax",1<<21);
&push ("eax");
&popf ();
&pushf ();
&pop ("eax");
&xor ("ecx","eax");
&bt ("ecx",21);
&jnc (&label("done"));
&xor ("eax","eax");
&cpuid ();
&xor ("eax","eax");
&cmp ("ebx",0x756e6547); # "Genu"
&data_byte(0x0f,0x95,0xc0); #&setne (&LB("eax"));
&mov ("ebp","eax");
&cmp ("edx",0x49656e69); # "ineI"
&data_byte(0x0f,0x95,0xc0); #&setne (&LB("eax"));
&or ("ebp","eax");
&cmp ("ecx",0x6c65746e); # "ntel"
&data_byte(0x0f,0x95,0xc0); #&setne (&LB("eax"));
&or ("ebp","eax");
&mov ("eax",1);
&cpuid ();
&cmp ("ebp",0);
&jne (&label("notP4"));
&and ("eax",15<<8); # familiy ID
&cmp ("eax",15<<8); # P4?
&jne (&label("notP4"));
&or ("edx",1<<20); # use reserved bit to engage RC4_CHAR
&set_label("notP4");
&bt ("edx",28); # test hyper-threading bit
&jnc (&label("done"));
&shr ("ebx",16);
&and ("ebx",0xff);
&cmp ("ebx",1); # see if cache is shared(*)
&ja (&label("done"));
&and ("edx",0xefffffff); # clear hyper-threading bit if not
&set_label("done");
&mov ("eax","edx");
&mov ("edx","ecx");
&function_end("OPENSSL_ia32_cpuid");
# (*) on Core2 this value is set to 2 denoting the fact that L2
# cache is shared between cores.
&external_label("OPENSSL_ia32cap_P");
&function_begin_B("OPENSSL_rdtsc","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
&xor ("eax","eax");
&xor ("edx","edx");
&picmeup("ecx","OPENSSL_ia32cap_P");
&bt (&DWP(0,"ecx"),4);
&jnc (&label("notsc"));
&rdtsc ();
&set_label("notsc");
&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");
# Essentially there is only one use for this function. Under DJGPP:
#
# #include <go32.h>
# ...
# i=OPENSSL_far_spin(_dos_ds,0x46c);
# ...
# to obtain the number of spins till closest timer interrupt.
&function_begin_B("OPENSSL_far_spin");
&pushf ();
&pop ("eax")
&bt ("eax",9);
&jnc (&label("nospin")); # interrupts are disabled
&mov ("eax",&DWP(4,"esp"));
&mov ("ecx",&DWP(8,"esp"));
&data_word (0x90d88e1e); # push %ds, mov %eax,%ds
&xor ("eax","eax");
&mov ("edx",&DWP(0,"ecx"));
&jmp (&label("spin"));
&align (16);
&set_label("spin");
&inc ("eax");
&cmp ("edx",&DWP(0,"ecx"));
&je (&label("spin"));
&data_word (0x1f909090); # pop %ds
&ret ();
&set_label("nospin");
&xor ("eax","eax");
&xor ("edx","edx");
&ret ();
&function_end_B("OPENSSL_far_spin");
&function_begin_B("OPENSSL_wipe_cpu","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
&xor ("eax","eax");
&xor ("edx","edx");
&picmeup("ecx","OPENSSL_ia32cap_P");
&mov ("ecx",&DWP(0,"ecx"));
&bt (&DWP(0,"ecx"),1);
&jnc (&label("no_x87"));
if ($sse2) {
&bt (&DWP(0,"ecx"),26);
&jnc (&label("no_sse2"));
&pxor ("xmm0","xmm0");
&pxor ("xmm1","xmm1");
&pxor ("xmm2","xmm2");
&pxor ("xmm3","xmm3");
&pxor ("xmm4","xmm4");
&pxor ("xmm5","xmm5");
&pxor ("xmm6","xmm6");
&pxor ("xmm7","xmm7");
&set_label("no_sse2");
}
# just a bunch of fldz to zap the fp/mm bank followed by finit...
&data_word(0xeed9eed9,0xeed9eed9,0xeed9eed9,0xeed9eed9,0x90e3db9b);
&set_label("no_x87");
&lea ("eax",&DWP(4,"esp"));
&ret ();
&function_end_B("OPENSSL_wipe_cpu");
&function_begin_B("OPENSSL_atomic_add");
&mov ("edx",&DWP(4,"esp")); # fetch the pointer, 1st arg
&mov ("ecx",&DWP(8,"esp")); # fetch the increment, 2nd arg
&push ("ebx");
&nop ();
&mov ("eax",&DWP(0,"edx"));
&set_label("spin");
&lea ("ebx",&DWP(0,"eax","ecx"));
&nop ();
&data_word(0x1ab10ff0); # lock; cmpxchg %ebx,(%edx) # %eax is envolved and is always reloaded
&jne (&label("spin"));
&mov ("eax","ebx"); # OpenSSL expects the new value
&pop ("ebx");
&ret ();
&function_end_B("OPENSSL_atomic_add");
# This function can become handy under Win32 in situations when
# we don't know which calling convention, __stdcall or __cdecl(*),
# indirect callee is using. In C it can be deployed as
#
#ifdef OPENSSL_CPUID_OBJ
# type OPENSSL_indirect_call(void *f,...);
# ...
# OPENSSL_indirect_call(func,[up to $max arguments]);
#endif
#
# (*) it's designed to work even for __fastcall if number of
# arguments is 1 or 2!
&function_begin_B("OPENSSL_indirect_call");
{
my $i,$max=7; # $max has to be chosen as 4*n-1
# in order to preserve eventual
# stack alignment
&push ("ebp");
&mov ("ebp","esp");
&sub ("esp",$max*4);
&mov ("ecx",&DWP(12,"ebp"));
&mov (&DWP(0,"esp"),"ecx");
&mov ("edx",&DWP(16,"ebp"));
&mov (&DWP(4,"esp"),"edx");
for($i=2;$i<$max;$i++)
{
# Some copies will be redundant/bogus...
&mov ("eax",&DWP(12+$i*4,"ebp"));
&mov (&DWP(0+$i*4,"esp"),"eax");
}
&call_ptr (&DWP(8,"ebp"));# make the call...
&mov ("esp","ebp"); # ... and just restore the stack pointer
# without paying attention to what we called,
# (__cdecl *func) or (__stdcall *one).
&pop ("ebp");
&ret ();
}
&function_end_B("OPENSSL_indirect_call");
&initseg("OPENSSL_cpuid_setup");
&asm_finish();
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