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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("nocpuid"));
&mov ("eax",1);
&cpuid ();
&set_label("nocpuid");
&mov ("eax","edx");
&mov ("edx","ecx");
&function_end("OPENSSL_ia32_cpuid");
&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");
&initseg("OPENSSL_cpuid_setup");
&asm_finish();
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