crypto/x86cpuid.pl

   1 #!/usr/bin/env perl
   2
   3 $0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
   4 push(@INC, "${dir}perlasm", "perlasm");
   5 require "x86asm.pl";
   6
   7 &asm_init($ARGV[0],"x86cpuid");
   8
   9 for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
  10
  11 &function_begin("OPENSSL_ia32_cpuid");
  12         &xor    ("edx","edx");
  13         &pushf  ();
  14         &pop    ("eax");
  15         &mov    ("ecx","eax");
  16         &xor    ("eax",1<<21);
  17         &push   ("eax");
  18         &popf   ();
  19         &pushf  ();
  20         &pop    ("eax");
  21         &xor    ("ecx","eax");
  22         &xor    ("eax","eax");
  23         &bt     ("ecx",21);
  24         &jnc    (&label("nocpuid"));
  25         &mov    ("esi",&wparam(0));
  26         &mov    (&DWP(8,"esi"),"eax");  # clear 3rd word
  27         &cpuid  ();
  28         &mov    ("edi","eax");          # max value for standard query level
  29
  30         &xor    ("eax","eax");
  31         &cmp    ("ebx",0x756e6547);     # "Genu"
  32         &setne  (&LB("eax"));
  33         &mov    ("ebp","eax");
  34         &cmp    ("edx",0x49656e69);     # "ineI"
  35         &setne  (&LB("eax"));
  36         &or     ("ebp","eax");
  37         &cmp    ("ecx",0x6c65746e);     # "ntel"
  38         &setne  (&LB("eax"));
  39         &or     ("ebp","eax");          # 0 indicates Intel CPU
  40         &jz     (&label("intel"));
  41
  42         &cmp    ("ebx",0x68747541);     # "Auth"
  43         &setne  (&LB("eax"));
  44         &mov    ("esi","eax");
  45         &cmp    ("edx",0x69746E65);     # "enti"
  46         &setne  (&LB("eax"));
  47         &or     ("esi","eax");
  48         &cmp    ("ecx",0x444D4163);     # "cAMD"
  49         &setne  (&LB("eax"));
  50         &or     ("esi","eax");          # 0 indicates AMD CPU
  51         &jnz    (&label("intel"));
  52
  53         # AMD specific
  54         &mov    ("eax",0x80000000);
  55         &cpuid  ();
  56         &cmp    ("eax",0x80000001);
  57         &jb     (&label("intel"));
  58         &mov    ("esi","eax");
  59         &mov    ("eax",0x80000001);
  60         &cpuid  ();
  61         &or     ("ebp","ecx");
  62         &and    ("ebp",1<<11|1);        # isolate XOP bit
  63         &cmp    ("esi",0x80000008);
  64         &jb     (&label("intel"));
  65
  66         &mov    ("eax",0x80000008);
  67         &cpuid  ();
  68         &movz   ("esi",&LB("ecx"));     # number of cores - 1
  69         &inc    ("esi");                # number of cores
  70
  71         &mov    ("eax",1);
  72         &xor    ("ecx","ecx");
  73         &cpuid  ();
  74         &bt     ("edx",28);
  75         &jnc    (&label("generic"));
  76         &shr    ("ebx",16);
  77         &and    ("ebx",0xff);
  78         &cmp    ("ebx","esi");
  79         &ja     (&label("generic"));
  80         &and    ("edx",0xefffffff);     # clear hyper-threading bit
  81         &jmp    (&label("generic"));
  82
  83 &set_label("intel");
  84         &cmp    ("edi",7);
  85         &jb     (&label("cacheinfo"));
  86
  87         &mov    ("esi",&wparam(0));
  88         &mov    ("eax",7);
  89         &xor    ("ecx","ecx");
  90         &cpuid  ();
  91         &mov    (&DWP(8,"esi"),"ebx");
  92
  93 &set_label("cacheinfo");
  94         &cmp    ("edi",4);
  95         &mov    ("edi",-1);
  96         &jb     (&label("nocacheinfo"));
  97
  98         &mov    ("eax",4);
  99         &mov    ("ecx",0);              # query L1D
 100         &cpuid  ();
 101         &mov    ("edi","eax");
 102         &shr    ("edi",14);
 103         &and    ("edi",0xfff);          # number of cores -1 per L1D
 104
 105 &set_label("nocacheinfo");
 106         &mov    ("eax",1);
 107         &xor    ("ecx","ecx");
 108         &cpuid  ();
 109         &and    ("edx",0xbfefffff);     # force reserved bits #20, #30 to 0
 110         &cmp    ("ebp",0);
 111         &jne    (&label("notintel"));
 112         &or     ("edx",1<<30);          # set reserved bit#30 on Intel CPUs
 113         &and    (&HB("eax"),15);        # familiy ID
 114         &cmp    (&HB("eax"),15);        # P4?
 115         &jne    (&label("notintel"));
 116         &or     ("edx",1<<20);          # set reserved bit#20 to engage RC4_CHAR
 117 &set_label("notintel");
 118         &bt     ("edx",28);             # test hyper-threading bit
 119         &jnc    (&label("generic"));
 120         &and    ("edx",0xefffffff);
 121         &cmp    ("edi",0);
 122         &je     (&label("generic"));
 123
 124         &or     ("edx",0x10000000);
 125         &shr    ("ebx",16);
 126         &cmp    (&LB("ebx"),1);
 127         &ja     (&label("generic"));
 128         &and    ("edx",0xefffffff);     # clear hyper-threading bit if not
 129
 130 &set_label("generic");
 131         &and    ("ebp",1<<11);          # isolate AMD XOP flag
 132         &and    ("ecx",0xfffff7ff);     # force 11th bit to 0
 133         &mov    ("esi","edx");
 134         &or     ("ebp","ecx");          # merge AMD XOP flag
 135
 136         &bt     ("ecx",27);             # check OSXSAVE bit
 137         &jnc    (&label("clear_avx"));
 138         &xor    ("ecx","ecx");
 139         &data_byte(0x0f,0x01,0xd0);     # xgetbv
 140         &and    ("eax",6);
 141         &cmp    ("eax",6);
 142         &je     (&label("done"));
 143         &cmp    ("eax",2);
 144         &je     (&label("clear_avx"));
 145 &set_label("clear_xmm");
 146         &and    ("ebp",0xfdfffffd);     # clear AESNI and PCLMULQDQ bits
 147         &and    ("esi",0xfeffffff);     # clear FXSR
 148 &set_label("clear_avx");
 149         &and    ("ebp",0xefffe7ff);     # clear AVX, FMA and AMD XOP bits
 150         &mov    ("edi",&wparam(0));
 151         &and    (&DWP(8,"edi"),0xffffffdf);     # clear AVX2
 152 &set_label("done");
 153         &mov    ("eax","esi");
 154         &mov    ("edx","ebp");
 155 &set_label("nocpuid");
 156 &function_end("OPENSSL_ia32_cpuid");
 157
 158 &external_label("OPENSSL_ia32cap_P");
 159
 160 &function_begin_B("OPENSSL_rdtsc","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
 161         &xor    ("eax","eax");
 162         &xor    ("edx","edx");
 163         &picmeup("ecx","OPENSSL_ia32cap_P");
 164         &bt     (&DWP(0,"ecx"),4);
 165         &jnc    (&label("notsc"));
 166         &rdtsc  ();
 167 &set_label("notsc");
 168         &ret    ();
 169 &function_end_B("OPENSSL_rdtsc");
 170
 171 # This works in Ring 0 only [read DJGPP+MS-DOS+privileged DPMI host],
 172 # but it's safe to call it on any [supported] 32-bit platform...
 173 # Just check for [non-]zero return value...
 174 &function_begin_B("OPENSSL_instrument_halt","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
 175         &picmeup("ecx","OPENSSL_ia32cap_P");
 176         &bt     (&DWP(0,"ecx"),4);
 177         &jnc    (&label("nohalt"));     # no TSC
 178
 179         &data_word(0x9058900e);         # push %cs; pop %eax
 180         &and    ("eax",3);
 181         &jnz    (&label("nohalt"));     # not enough privileges
 182
 183         &pushf  ();
 184         &pop    ("eax");
 185         &bt     ("eax",9);
 186         &jnc    (&label("nohalt"));     # interrupts are disabled
 187
 188         &rdtsc  ();
 189         &push   ("edx");
 190         &push   ("eax");
 191         &halt   ();
 192         &rdtsc  ();
 193
 194         &sub    ("eax",&DWP(0,"esp"));
 195         &sbb    ("edx",&DWP(4,"esp"));
 196         &add    ("esp",8);
 197         &ret    ();
 198
 199 &set_label("nohalt");
 200         &xor    ("eax","eax");
 201         &xor    ("edx","edx");
 202         &ret    ();
 203 &function_end_B("OPENSSL_instrument_halt");
 204
 205 # Essentially there is only one use for this function. Under DJGPP:
 206 #
 207 #       #include <go32.h>
 208 #       ...
 209 #       i=OPENSSL_far_spin(_dos_ds,0x46c);
 210 #       ...
 211 # to obtain the number of spins till closest timer interrupt.
 212
 213 &function_begin_B("OPENSSL_far_spin");
 214         &pushf  ();
 215         &pop    ("eax");
 216         &bt     ("eax",9);
 217         &jnc    (&label("nospin"));     # interrupts are disabled
 218
 219         &mov    ("eax",&DWP(4,"esp"));
 220         &mov    ("ecx",&DWP(8,"esp"));
 221         &data_word (0x90d88e1e);        # push %ds, mov %eax,%ds
 222         &xor    ("eax","eax");
 223         &mov    ("edx",&DWP(0,"ecx"));
 224         &jmp    (&label("spin"));
 225
 226         &align  (16);
 227 &set_label("spin");
 228         &inc    ("eax");
 229         &cmp    ("edx",&DWP(0,"ecx"));
 230         &je     (&label("spin"));
 231
 232         &data_word (0x1f909090);        # pop   %ds
 233         &ret    ();
 234
 235 &set_label("nospin");
 236         &xor    ("eax","eax");
 237         &xor    ("edx","edx");
 238         &ret    ();
 239 &function_end_B("OPENSSL_far_spin");
 240
 241 &function_begin_B("OPENSSL_wipe_cpu","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
 242         &xor    ("eax","eax");
 243         &xor    ("edx","edx");
 244         &picmeup("ecx","OPENSSL_ia32cap_P");
 245         &mov    ("ecx",&DWP(0,"ecx"));
 246         &bt     (&DWP(0,"ecx"),1);
 247         &jnc    (&label("no_x87"));
 248         if ($sse2) {
 249                 &and    ("ecx",1<<26|1<<24);    # check SSE2 and FXSR bits
 250                 &cmp    ("ecx",1<<26|1<<24);
 251                 &jne    (&label("no_sse2"));
 252                 &pxor   ("xmm0","xmm0");
 253                 &pxor   ("xmm1","xmm1");
 254                 &pxor   ("xmm2","xmm2");
 255                 &pxor   ("xmm3","xmm3");
 256                 &pxor   ("xmm4","xmm4");
 257                 &pxor   ("xmm5","xmm5");
 258                 &pxor   ("xmm6","xmm6");
 259                 &pxor   ("xmm7","xmm7");
 260         &set_label("no_sse2");
 261         }
 262         # just a bunch of fldz to zap the fp/mm bank followed by finit...
 263         &data_word(0xeed9eed9,0xeed9eed9,0xeed9eed9,0xeed9eed9,0x90e3db9b);
 264 &set_label("no_x87");
 265         &lea    ("eax",&DWP(4,"esp"));
 266         &ret    ();
 267 &function_end_B("OPENSSL_wipe_cpu");
 268
 269 &function_begin_B("OPENSSL_atomic_add");
 270         &mov    ("edx",&DWP(4,"esp"));  # fetch the pointer, 1st arg
 271         &mov    ("ecx",&DWP(8,"esp"));  # fetch the increment, 2nd arg
 272         &push   ("ebx");
 273         &nop    ();
 274         &mov    ("eax",&DWP(0,"edx"));
 275 &set_label("spin");
 276         &lea    ("ebx",&DWP(0,"eax","ecx"));
 277         &nop    ();
 278         &data_word(0x1ab10ff0); # lock; cmpxchg %ebx,(%edx)     # %eax is envolved and is always reloaded
 279         &jne    (&label("spin"));
 280         &mov    ("eax","ebx");  # OpenSSL expects the new value
 281         &pop    ("ebx");
 282         &ret    ();
 283 &function_end_B("OPENSSL_atomic_add");
 284
 285 # This function can become handy under Win32 in situations when
 286 # we don't know which calling convention, __stdcall or __cdecl(*),
 287 # indirect callee is using. In C it can be deployed as
 288 #
 289 #ifdef OPENSSL_CPUID_OBJ
 290 #       type OPENSSL_indirect_call(void *f,...);
 291 #       ...
 292 #       OPENSSL_indirect_call(func,[up to $max arguments]);
 293 #endif
 294 #
 295 # (*)   it's designed to work even for __fastcall if number of
 296 #       arguments is 1 or 2!
 297 &function_begin_B("OPENSSL_indirect_call");
 298         {
 299         my ($max,$i)=(7,);      # $max has to be chosen as 4*n-1
 300                                 # in order to preserve eventual
 301                                 # stack alignment
 302         &push   ("ebp");
 303         &mov    ("ebp","esp");
 304         &sub    ("esp",$max*4);
 305         &mov    ("ecx",&DWP(12,"ebp"));
 306         &mov    (&DWP(0,"esp"),"ecx");
 307         &mov    ("edx",&DWP(16,"ebp"));
 308         &mov    (&DWP(4,"esp"),"edx");
 309         for($i=2;$i<$max;$i++)
 310                 {
 311                 # Some copies will be redundant/bogus...
 312                 &mov    ("eax",&DWP(12+$i*4,"ebp"));
 313                 &mov    (&DWP(0+$i*4,"esp"),"eax");
 314                 }
 315         &call_ptr       (&DWP(8,"ebp"));# make the call...
 316         &mov    ("esp","ebp");  # ... and just restore the stack pointer
 317                                 # without paying attention to what we called,
 318                                 # (__cdecl *func) or (__stdcall *one).
 319         &pop    ("ebp");
 320         &ret    ();
 321         }
 322 &function_end_B("OPENSSL_indirect_call");
 323
 324 &function_begin_B("OPENSSL_cleanse");
 325         &mov    ("edx",&wparam(0));
 326         &mov    ("ecx",&wparam(1));
 327         &xor    ("eax","eax");
 328         &cmp    ("ecx",7);
 329         &jae    (&label("lot"));
 330         &cmp    ("ecx",0);
 331         &je     (&label("ret"));
 332 &set_label("little");
 333         &mov    (&BP(0,"edx"),"al");
 334         &sub    ("ecx",1);
 335         &lea    ("edx",&DWP(1,"edx"));
 336         &jnz    (&label("little"));
 337 &set_label("ret");
 338         &ret    ();
 339
 340 &set_label("lot",16);
 341         &test   ("edx",3);
 342         &jz     (&label("aligned"));
 343         &mov    (&BP(0,"edx"),"al");
 344         &lea    ("ecx",&DWP(-1,"ecx"));
 345         &lea    ("edx",&DWP(1,"edx"));
 346         &jmp    (&label("lot"));
 347 &set_label("aligned");
 348         &mov    (&DWP(0,"edx"),"eax");
 349         &lea    ("ecx",&DWP(-4,"ecx"));
 350         &test   ("ecx",-4);
 351         &lea    ("edx",&DWP(4,"edx"));
 352         &jnz    (&label("aligned"));
 353         &cmp    ("ecx",0);
 354         &jne    (&label("little"));
 355         &ret    ();
 356 &function_end_B("OPENSSL_cleanse");
 357
 358 &function_begin_B("OPENSSL_ia32_rdrand");
 359         &mov    ("ecx",8);
 360 &set_label("loop");
 361         &rdrand ("eax");
 362         &jc     (&label("break"));
 363         &loop   (&label("loop"));
 364 &set_label("break");
 365         &cmp    ("eax",0);
 366         &cmove  ("eax","ecx");
 367         &ret    ();
 368 &function_end_B("OPENSSL_ia32_rdrand");
 369
 370 &function_begin_B("OPENSSL_ia32_rdseed");
 371         &mov    ("ecx",8);
 372 &set_label("loop");
 373         &rdseed ("eax");
 374         &jc     (&label("break"));
 375         &loop   (&label("loop"));
 376 &set_label("break");
 377         &cmp    ("eax",0);
 378         &cmove  ("eax","ecx");
 379         &ret    ();
 380 &function_end_B("OPENSSL_ia32_rdseed");
 381
 382 &initseg("OPENSSL_cpuid_setup");
 383
 384 &hidden("OPENSSL_cpuid_setup");
 385 &hidden("OPENSSL_ia32cap_P");
 386
 387 &asm_finish();