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         &bt     ("ecx",21);
  23         &jnc    (&label("done"));
  24         &xor    ("eax","eax");
  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",0x80000008);
  55         &jb     (&label("intel"));
  56
  57         &mov    ("eax",0x80000008);
  58         &cpuid  ();
  59         &movz   ("esi",&LB("ecx"));     # number of cores - 1
  60         &inc    ("esi");                # number of cores
  61
  62         &mov    ("eax",1);
  63         &cpuid  ();
  64         &bt     ("edx",28);
  65         &jnc    (&label("done"));
  66         &shr    ("ebx",16);
  67         &and    ("ebx",0xff);
  68         &cmp    ("ebx","esi");
  69         &ja     (&label("done"));
  70         &and    ("edx",0xefffffff);     # clear hyper-threading bit
  71         &jmp    (&label("done"));
  72
  73 &set_label("intel");
  74         &cmp    ("edi",4);
  75         &mov    ("edi",-1);
  76         &jb     (&label("nocacheinfo"));
  77
  78         &mov    ("eax",4);
  79         &mov    ("ecx",0);              # query L1D
  80         &cpuid  ();
  81         &mov    ("edi","eax");
  82         &shr    ("edi",14);
  83         &and    ("edi",0xfff);          # number of cores -1 per L1D
  84
  85 &set_label("nocacheinfo");
  86         &mov    ("eax",1);
  87         &cpuid  ();
  88         &cmp    ("ebp",0);
  89         &jne    (&label("notP4"));
  90         &and    (&HB("eax"),15);        # familiy ID
  91         &cmp    (&HB("eax"),15);        # P4?
  92         &jne    (&label("notP4"));
  93         &or     ("edx",1<<20);          # use reserved bit to engage RC4_CHAR
  94 &set_label("notP4");
  95         &bt     ("edx",28);             # test hyper-threading bit
  96         &jnc    (&label("done"));
  97         &and    ("edx",0xefffffff);
  98         &cmp    ("edi",0);
  99         &je     (&label("done"));
 100
 101         &or     ("edx",0x10000000);
 102         &shr    ("ebx",16);
 103         &cmp    (&LB("ebx"),1);
 104         &ja     (&label("done"));
 105         &and    ("edx",0xefffffff);     # clear hyper-threading bit if not
 106 &set_label("done");
 107         &mov    ("eax","edx");
 108         &mov    ("edx","ecx");
 109 &function_end("OPENSSL_ia32_cpuid");
 110
 111 &external_label("OPENSSL_ia32cap_P");
 112
 113 &function_begin_B("OPENSSL_rdtsc","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
 114         &xor    ("eax","eax");
 115         &xor    ("edx","edx");
 116         &picmeup("ecx","OPENSSL_ia32cap_P");
 117         &bt     (&DWP(0,"ecx"),4);
 118         &jnc    (&label("notsc"));
 119         &rdtsc  ();
 120 &set_label("notsc");
 121         &ret    ();
 122 &function_end_B("OPENSSL_rdtsc");
 123
 124 # This works in Ring 0 only [read DJGPP+MS-DOS+privileged DPMI host],
 125 # but it's safe to call it on any [supported] 32-bit platform...
 126 # Just check for [non-]zero return value...
 127 &function_begin_B("OPENSSL_instrument_halt","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
 128         &picmeup("ecx","OPENSSL_ia32cap_P");
 129         &bt     (&DWP(0,"ecx"),4);
 130         &jnc    (&label("nohalt"));     # no TSC
 131
 132         &data_word(0x9058900e);         # push %cs; pop %eax
 133         &and    ("eax",3);
 134         &jnz    (&label("nohalt"));     # not enough privileges
 135
 136         &pushf  ();
 137         &pop    ("eax")
 138         &bt     ("eax",9);
 139         &jnc    (&label("nohalt"));     # interrupts are disabled
 140
 141         &rdtsc  ();
 142         &push   ("edx");
 143         &push   ("eax");
 144         &halt   ();
 145         &rdtsc  ();
 146
 147         &sub    ("eax",&DWP(0,"esp"));
 148         &sbb    ("edx",&DWP(4,"esp"));
 149         &add    ("esp",8);
 150         &ret    ();
 151
 152 &set_label("nohalt");
 153         &xor    ("eax","eax");
 154         &xor    ("edx","edx");
 155         &ret    ();
 156 &function_end_B("OPENSSL_instrument_halt");
 157
 158 # Essentially there is only one use for this function. Under DJGPP:
 159 #
 160 #       #include <go32.h>
 161 #       ...
 162 #       i=OPENSSL_far_spin(_dos_ds,0x46c);
 163 #       ...
 164 # to obtain the number of spins till closest timer interrupt.
 165
 166 &function_begin_B("OPENSSL_far_spin");
 167         &pushf  ();
 168         &pop    ("eax")
 169         &bt     ("eax",9);
 170         &jnc    (&label("nospin"));     # interrupts are disabled
 171
 172         &mov    ("eax",&DWP(4,"esp"));
 173         &mov    ("ecx",&DWP(8,"esp"));
 174         &data_word (0x90d88e1e);        # push %ds, mov %eax,%ds
 175         &xor    ("eax","eax");
 176         &mov    ("edx",&DWP(0,"ecx"));
 177         &jmp    (&label("spin"));
 178
 179         &align  (16);
 180 &set_label("spin");
 181         &inc    ("eax");
 182         &cmp    ("edx",&DWP(0,"ecx"));
 183         &je     (&label("spin"));
 184
 185         &data_word (0x1f909090);        # pop   %ds
 186         &ret    ();
 187
 188 &set_label("nospin");
 189         &xor    ("eax","eax");
 190         &xor    ("edx","edx");
 191         &ret    ();
 192 &function_end_B("OPENSSL_far_spin");
 193
 194 &function_begin_B("OPENSSL_wipe_cpu","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
 195         &xor    ("eax","eax");
 196         &xor    ("edx","edx");
 197         &picmeup("ecx","OPENSSL_ia32cap_P");
 198         &mov    ("ecx",&DWP(0,"ecx"));
 199         &bt     (&DWP(0,"ecx"),1);
 200         &jnc    (&label("no_x87"));
 201         if ($sse2) {
 202                 &bt     (&DWP(0,"ecx"),26);
 203                 &jnc    (&label("no_sse2"));
 204                 &pxor   ("xmm0","xmm0");
 205                 &pxor   ("xmm1","xmm1");
 206                 &pxor   ("xmm2","xmm2");
 207                 &pxor   ("xmm3","xmm3");
 208                 &pxor   ("xmm4","xmm4");
 209                 &pxor   ("xmm5","xmm5");
 210                 &pxor   ("xmm6","xmm6");
 211                 &pxor   ("xmm7","xmm7");
 212         &set_label("no_sse2");
 213         }
 214         # just a bunch of fldz to zap the fp/mm bank followed by finit...
 215         &data_word(0xeed9eed9,0xeed9eed9,0xeed9eed9,0xeed9eed9,0x90e3db9b);
 216 &set_label("no_x87");
 217         &lea    ("eax",&DWP(4,"esp"));
 218         &ret    ();
 219 &function_end_B("OPENSSL_wipe_cpu");
 220
 221 &function_begin_B("OPENSSL_atomic_add");
 222         &mov    ("edx",&DWP(4,"esp"));  # fetch the pointer, 1st arg
 223         &mov    ("ecx",&DWP(8,"esp"));  # fetch the increment, 2nd arg
 224         &push   ("ebx");
 225         &nop    ();
 226         &mov    ("eax",&DWP(0,"edx"));
 227 &set_label("spin");
 228         &lea    ("ebx",&DWP(0,"eax","ecx"));
 229         &nop    ();
 230         &data_word(0x1ab10ff0); # lock; cmpxchg %ebx,(%edx)     # %eax is envolved and is always reloaded
 231         &jne    (&label("spin"));
 232         &mov    ("eax","ebx");  # OpenSSL expects the new value
 233         &pop    ("ebx");
 234         &ret    ();
 235 &function_end_B("OPENSSL_atomic_add");
 236
 237 # This function can become handy under Win32 in situations when
 238 # we don't know which calling convention, __stdcall or __cdecl(*),
 239 # indirect callee is using. In C it can be deployed as
 240 #
 241 #ifdef OPENSSL_CPUID_OBJ
 242 #       type OPENSSL_indirect_call(void *f,...);
 243 #       ...
 244 #       OPENSSL_indirect_call(func,[up to $max arguments]);
 245 #endif
 246 #
 247 # (*)   it's designed to work even for __fastcall if number of
 248 #       arguments is 1 or 2!
 249 &function_begin_B("OPENSSL_indirect_call");
 250         {
 251         my $i,$max=7;           # $max has to be chosen as 4*n-1
 252                                 # in order to preserve eventual
 253                                 # stack alignment
 254         &push   ("ebp");
 255         &mov    ("ebp","esp");
 256         &sub    ("esp",$max*4);
 257         &mov    ("ecx",&DWP(12,"ebp"));
 258         &mov    (&DWP(0,"esp"),"ecx");
 259         &mov    ("edx",&DWP(16,"ebp"));
 260         &mov    (&DWP(4,"esp"),"edx");
 261         for($i=2;$i<$max;$i++)
 262                 {
 263                 # Some copies will be redundant/bogus...
 264                 &mov    ("eax",&DWP(12+$i*4,"ebp"));
 265                 &mov    (&DWP(0+$i*4,"esp"),"eax");
 266                 }
 267         &call_ptr       (&DWP(8,"ebp"));# make the call...
 268         &mov    ("esp","ebp");  # ... and just restore the stack pointer
 269                                 # without paying attention to what we called,
 270                                 # (__cdecl *func) or (__stdcall *one).
 271         &pop    ("ebp");
 272         &ret    ();
 273         }
 274 &function_end_B("OPENSSL_indirect_call");
 275
 276 &function_begin_B("OPENSSL_cleanse");
 277         &mov    ("edx",&wparam(0));
 278         &mov    ("ecx",&wparam(1));
 279         &xor    ("eax","eax");
 280         &cmp    ("ecx",7);
 281         &jae    (&label("lot"));
 282         &cmp    ("ecx",0);
 283         &je     (&label("ret"));
 284 &set_label("little");
 285         &mov    (&BP(0,"edx"),"al");
 286         &sub    ("ecx",1);
 287         &lea    ("edx",&DWP(1,"edx"));
 288         &jnz    (&label("little"));
 289 &set_label("ret");
 290         &ret    ();
 291
 292 &set_label("lot",16);
 293         &test   ("edx",3);
 294         &jz     (&label("aligned"));
 295         &mov    (&BP(0,"edx"),"al");
 296         &lea    ("ecx",&DWP(-1,"ecx"));
 297         &lea    ("edx",&DWP(1,"edx"));
 298         &jmp    (&label("lot"));
 299 &set_label("aligned");
 300         &mov    (&DWP(0,"edx"),"eax");
 301         &lea    ("ecx",&DWP(-4,"ecx"));
 302         &test   ("ecx",-4);
 303         &lea    ("edx",&DWP(4,"edx"));
 304         &jnz    (&label("aligned"));
 305         &cmp    ("ecx",0);
 306         &jne    (&label("little"));
 307         &ret    ();
 308 &function_end_B("OPENSSL_cleanse");
 309
 310 &initseg("OPENSSL_cpuid_setup");
 311
 312 &asm_finish();