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