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