159 lines
3.7 KiB
Raku
159 lines
3.7 KiB
Raku
#!/usr/bin/env perl
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push(@INC,"perlasm");
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require "x86asm.pl";
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&asm_init($ARGV[0],"x86cpuid");
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for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
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&function_begin("OPENSSL_ia32_cpuid");
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&xor ("edx","edx");
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&pushf ();
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&pop ("eax");
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&mov ("ecx","eax");
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&xor ("eax",1<<21);
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&push ("eax");
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&popf ();
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&pushf ();
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&pop ("eax");
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&xor ("ecx","eax");
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&bt ("ecx",21);
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&jnc (&label("nocpuid"));
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&mov ("eax",1);
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&cpuid ();
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&set_label("nocpuid");
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&mov ("eax","edx");
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&mov ("edx","ecx");
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&function_end("OPENSSL_ia32_cpuid");
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&external_label("OPENSSL_ia32cap_P");
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&function_begin_B("OPENSSL_rdtsc","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
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&xor ("eax","eax");
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&xor ("edx","edx");
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&picmeup("ecx","OPENSSL_ia32cap_P");
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&bt (&DWP(0,"ecx"),4);
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&jnc (&label("notsc"));
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&rdtsc ();
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&set_label("notsc");
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&ret ();
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&function_end_B("OPENSSL_rdtsc");
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# This works in Ring 0 only [read DJGPP+MS-DOS+privileged DPMI host],
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# but it's safe to call it on any [supported] 32-bit platform...
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# Just check for [non-]zero return value...
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&function_begin_B("OPENSSL_instrument_halt","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
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&picmeup("ecx","OPENSSL_ia32cap_P");
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&bt (&DWP(0,"ecx"),4);
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&jnc (&label("nohalt")); # no TSC
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&data_word(0x9058900e); # push %cs; pop %eax
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&and ("eax",3);
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&jnz (&label("nohalt")); # not enough privileges
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&pushf ();
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&pop ("eax")
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&bt ("eax",9);
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&jnc (&label("nohalt")); # interrupts are disabled
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&rdtsc ();
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&push ("edx");
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&push ("eax");
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&halt ();
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&rdtsc ();
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&sub ("eax",&DWP(0,"esp"));
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&sbb ("edx",&DWP(4,"esp"));
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&add ("esp",8);
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&ret ();
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&set_label("nohalt");
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&xor ("eax","eax");
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&xor ("edx","edx");
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&ret ();
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&function_end_B("OPENSSL_instrument_halt");
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# Essentially there is only one use for this function. Under DJGPP:
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#
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# #include <go32.h>
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# ...
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# i=OPENSSL_far_spin(_dos_ds,0x46c);
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# ...
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# to obtain the number of spins till closest timer interrupt.
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&function_begin_B("OPENSSL_far_spin");
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&pushf ();
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&pop ("eax")
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&bt ("eax",9);
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&jnc (&label("nospin")); # interrupts are disabled
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&mov ("eax",&DWP(4,"esp"));
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&mov ("ecx",&DWP(8,"esp"));
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&data_word (0x90d88e1e); # push %ds, mov %eax,%ds
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&xor ("eax","eax");
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&mov ("edx",&DWP(0,"ecx"));
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&jmp (&label("spin"));
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&align (16);
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&set_label("spin");
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&inc ("eax");
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&cmp ("edx",&DWP(0,"ecx"));
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&je (&label("spin"));
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&data_word (0x1f909090); # pop %ds
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&ret ();
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&set_label("nospin");
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&xor ("eax","eax");
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&xor ("edx","edx");
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&ret ();
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&function_end_B("OPENSSL_far_spin");
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&function_begin_B("OPENSSL_wipe_cpu","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
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&xor ("eax","eax");
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&xor ("edx","edx");
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&picmeup("ecx","OPENSSL_ia32cap_P");
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&mov ("ecx",&DWP(0,"ecx"));
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&bt (&DWP(0,"ecx"),1);
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&jnc (&label("no_x87"));
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if ($sse2) {
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&bt (&DWP(0,"ecx"),26);
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&jnc (&label("no_sse2"));
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&pxor ("xmm0","xmm0");
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&pxor ("xmm1","xmm1");
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&pxor ("xmm2","xmm2");
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&pxor ("xmm3","xmm3");
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&pxor ("xmm4","xmm4");
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&pxor ("xmm5","xmm5");
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&pxor ("xmm6","xmm6");
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&pxor ("xmm7","xmm7");
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&set_label("no_sse2");
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}
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# just a bunch of fldz to zap the fp/mm bank...
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&data_word(0xeed9eed9,0xeed9eed9,0xeed9eed9,0xeed9eed9);
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&emms ();
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&set_label("no_x87");
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&lea ("eax",&DWP(4,"esp"));
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&ret ();
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&function_end_B("OPENSSL_wipe_cpu");
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&function_begin_B("OPENSSL_atomic_add");
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&mov ("edx",&DWP(4,"esp")); # fetch the pointer, 1st arg
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&mov ("ecx",&DWP(8,"esp")); # fetch the increment, 2nd arg
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&push ("ebx");
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&nop ();
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&mov ("eax",&DWP(0,"edx"));
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&set_label("spin");
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&lea ("ebx",&DWP(0,"eax","ecx"));
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&nop ();
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&data_word(0x1ab10ff0); # lock; cmpxchg %ebx,(%edx) # %eax is envolved and is always reloaded
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&jne (&label("spin"));
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&mov ("eax","ebx"); # OpenSSL expects the new value
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&pop ("ebx");
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&ret ();
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&function_end_B("OPENSSL_atomic_add");
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&initseg("OPENSSL_cpuid_setup");
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&asm_finish();
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