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