mirror of
https://github.com/openssl/openssl.git
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14e21f863a
is to have a placeholder to small routines, which can be written only in assembler. In IA-32 case this includes processor capability identification and access to Time-Stamp Counter. As discussed earlier OPENSSL_ia32cap is introduced to control recently added SSE2 code pathes (see docs/crypto/OPENSSL_ia32cap.pod). For the moment the code is operational on ELF platforms only. I haven't checked it yet, but I have all reasons to believe that Windows build should fail to link too. I'll be looking into it shortly...
44 lines
820 B
Raku
44 lines
820 B
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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&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");
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&function_begin_B("OPENSSL_rdtsc");
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&xor ("eax","eax");
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&xor ("edx","edx");
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&picmeup("ecx","OPENSSL_ia32cap");
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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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&initseg("OPENSSL_cpuid_setup") if ($main'elf);
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&asm_finish();
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