crypto/openssl/crypto/x86cpuid.pl

   1 #!/usr/bin/env perl
   2
   3 push(@INC,"perlasm");
   4 require "x86asm.pl";
   5
   6 &asm_init($ARGV[0],"x86cpuid");
   7
   8 for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
   9
  10 &function_begin("OPENSSL_ia32_cpuid");
  11         &xor    ("edx","edx");
  12         &pushf  ();
  13         &pop    ("eax");
  14         &mov    ("ecx","eax");
  15         &xor    ("eax",1<<21);
  16         &push   ("eax");
  17         &popf   ();
  18         &pushf  ();
  19         &pop    ("eax");
  20         &xor    ("ecx","eax");
  21         &bt     ("ecx",21);
  22         &jnc    (&label("done"));
  23         &xor    ("eax","eax");
  24         &cpuid  ();
  25         &xor    ("eax","eax");
  26         &cmp    ("ebx",0x756e6547);     # "Genu"
  27         &data_byte(0x0f,0x95,0xc0);     #&setne (&LB("eax"));
  28         &mov    ("ebp","eax");
  29         &cmp    ("edx",0x49656e69);     # "ineI"
  30         &data_byte(0x0f,0x95,0xc0);     #&setne (&LB("eax"));
  31         &or     ("ebp","eax");
  32         &cmp    ("ecx",0x6c65746e);     # "ntel"
  33         &data_byte(0x0f,0x95,0xc0);     #&setne (&LB("eax"));
  34         &or     ("ebp","eax");
  35         &mov    ("eax",1);
  36         &cpuid  ();
  37         &cmp    ("ebp",0);
  38         &jne    (&label("notP4"));
  39         &and    ("eax",15<<8);          # familiy ID
  40         &cmp    ("eax",15<<8);          # P4?
  41         &jne    (&label("notP4"));
  42         &or     ("edx",1<<20);          # use reserved bit to engage RC4_CHAR
  43 &set_label("notP4");
  44         &bt     ("edx",28);             # test hyper-threading bit
  45         &jnc    (&label("done"));
  46         &shr    ("ebx",16);
  47         &and    ("ebx",0xff);
  48         &cmp    ("ebx",1);              # see if cache is shared(*)
  49         &ja     (&label("done"));
  50         &and    ("edx",0xefffffff);     # clear hyper-threading bit if not
  51 &set_label("done");
  52         &mov    ("eax","edx");
  53         &mov    ("edx","ecx");
  54 &function_end("OPENSSL_ia32_cpuid");
  55 # (*)   on Core2 this value is set to 2 denoting the fact that L2
  56 #       cache is shared between cores.
  57
  58 &external_label("OPENSSL_ia32cap_P");
  59
  60 &function_begin_B("OPENSSL_rdtsc","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
  61         &xor    ("eax","eax");
  62         &xor    ("edx","edx");
  63         &picmeup("ecx","OPENSSL_ia32cap_P");
  64         &bt     (&DWP(0,"ecx"),4);
  65         &jnc    (&label("notsc"));
  66         &rdtsc  ();
  67 &set_label("notsc");
  68         &ret    ();
  69 &function_end_B("OPENSSL_rdtsc");
  70
  71 # This works in Ring 0 only [read DJGPP+MS-DOS+privileged DPMI host],
  72 # but it's safe to call it on any [supported] 32-bit platform...
  73 # Just check for [non-]zero return value...
  74 &function_begin_B("OPENSSL_instrument_halt","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
  75         &picmeup("ecx","OPENSSL_ia32cap_P");
  76         &bt     (&DWP(0,"ecx"),4);
  77         &jnc    (&label("nohalt"));     # no TSC
  78
  79         &data_word(0x9058900e);         # push %cs; pop %eax
  80         &and    ("eax",3);
  81         &jnz    (&label("nohalt"));     # not enough privileges
  82
  83         &pushf  ();
  84         &pop    ("eax")
  85         &bt     ("eax",9);
  86         &jnc    (&label("nohalt"));     # interrupts are disabled
  87
  88         &rdtsc  ();
  89         &push   ("edx");
  90         &push   ("eax");
  91         &halt   ();
  92         &rdtsc  ();
  93
  94         &sub    ("eax",&DWP(0,"esp"));
  95         &sbb    ("edx",&DWP(4,"esp"));
  96         &add    ("esp",8);
  97         &ret    ();
  98
  99 &set_label("nohalt");
 100         &xor    ("eax","eax");
 101         &xor    ("edx","edx");
 102         &ret    ();
 103 &function_end_B("OPENSSL_instrument_halt");
 104
 105 # Essentially there is only one use for this function. Under DJGPP:
 106 #
 107 #       #include <go32.h>
 108 #       ...
 109 #       i=OPENSSL_far_spin(_dos_ds,0x46c);
 110 #       ...
 111 # to obtain the number of spins till closest timer interrupt.
 112
 113 &function_begin_B("OPENSSL_far_spin");
 114         &pushf  ();
 115         &pop    ("eax")
 116         &bt     ("eax",9);
 117         &jnc    (&label("nospin"));     # interrupts are disabled
 118
 119         &mov    ("eax",&DWP(4,"esp"));
 120         &mov    ("ecx",&DWP(8,"esp"));
 121         &data_word (0x90d88e1e);        # push %ds, mov %eax,%ds
 122         &xor    ("eax","eax");
 123         &mov    ("edx",&DWP(0,"ecx"));
 124         &jmp    (&label("spin"));
 125
 126         &align  (16);
 127 &set_label("spin");
 128         &inc    ("eax");
 129         &cmp    ("edx",&DWP(0,"ecx"));
 130         &je     (&label("spin"));
 131
 132         &data_word (0x1f909090);        # pop   %ds
 133         &ret    ();
 134
 135 &set_label("nospin");
 136         &xor    ("eax","eax");
 137         &xor    ("edx","edx");
 138         &ret    ();
 139 &function_end_B("OPENSSL_far_spin");
 140
 141 &function_begin_B("OPENSSL_wipe_cpu","EXTRN\t_OPENSSL_ia32cap_P:DWORD");
 142         &xor    ("eax","eax");
 143         &xor    ("edx","edx");
 144         &picmeup("ecx","OPENSSL_ia32cap_P");
 145         &mov    ("ecx",&DWP(0,"ecx"));
 146         &bt     (&DWP(0,"ecx"),1);
 147         &jnc    (&label("no_x87"));
 148         if ($sse2) {
 149                 &bt     (&DWP(0,"ecx"),26);
 150                 &jnc    (&label("no_sse2"));
 151                 &pxor   ("xmm0","xmm0");
 152                 &pxor   ("xmm1","xmm1");
 153                 &pxor   ("xmm2","xmm2");
 154                 &pxor   ("xmm3","xmm3");
 155                 &pxor   ("xmm4","xmm4");
 156                 &pxor   ("xmm5","xmm5");
 157                 &pxor   ("xmm6","xmm6");
 158                 &pxor   ("xmm7","xmm7");
 159         &set_label("no_sse2");
 160         }
 161         # just a bunch of fldz to zap the fp/mm bank followed by finit...
 162         &data_word(0xeed9eed9,0xeed9eed9,0xeed9eed9,0xeed9eed9,0x90e3db9b);
 163 &set_label("no_x87");
 164         &lea    ("eax",&DWP(4,"esp"));
 165         &ret    ();
 166 &function_end_B("OPENSSL_wipe_cpu");
 167
 168 &function_begin_B("OPENSSL_atomic_add");
 169         &mov    ("edx",&DWP(4,"esp"));  # fetch the pointer, 1st arg
 170         &mov    ("ecx",&DWP(8,"esp"));  # fetch the increment, 2nd arg
 171         &push   ("ebx");
 172         &nop    ();
 173         &mov    ("eax",&DWP(0,"edx"));
 174 &set_label("spin");
 175         &lea    ("ebx",&DWP(0,"eax","ecx"));
 176         &nop    ();
 177         &data_word(0x1ab10ff0); # lock; cmpxchg %ebx,(%edx)     # %eax is envolved and is always reloaded
 178         &jne    (&label("spin"));
 179         &mov    ("eax","ebx");  # OpenSSL expects the new value
 180         &pop    ("ebx");
 181         &ret    ();
 182 &function_end_B("OPENSSL_atomic_add");
 183
 184 # This function can become handy under Win32 in situations when
 185 # we don't know which calling convention, __stdcall or __cdecl(*),
 186 # indirect callee is using. In C it can be deployed as
 187 #
 188 #ifdef OPENSSL_CPUID_OBJ
 189 #       type OPENSSL_indirect_call(void *f,...);
 190 #       ...
 191 #       OPENSSL_indirect_call(func,[up to $max arguments]);
 192 #endif
 193 #
 194 # (*)   it's designed to work even for __fastcall if number of
 195 #       arguments is 1 or 2!
 196 &function_begin_B("OPENSSL_indirect_call");
 197         {
 198         my $i,$max=7;           # $max has to be chosen as 4*n-1
 199                                 # in order to preserve eventual
 200                                 # stack alignment
 201         &push   ("ebp");
 202         &mov    ("ebp","esp");
 203         &sub    ("esp",$max*4);
 204         &mov    ("ecx",&DWP(12,"ebp"));
 205         &mov    (&DWP(0,"esp"),"ecx");
 206         &mov    ("edx",&DWP(16,"ebp"));
 207         &mov    (&DWP(4,"esp"),"edx");
 208         for($i=2;$i<$max;$i++)
 209                 {
 210                 # Some copies will be redundant/bogus...
 211                 &mov    ("eax",&DWP(12+$i*4,"ebp"));
 212                 &mov    (&DWP(0+$i*4,"esp"),"eax");
 213                 }
 214         &call_ptr       (&DWP(8,"ebp"));# make the call...
 215         &mov    ("esp","ebp");  # ... and just restore the stack pointer
 216                                 # without paying attention to what we called,
 217                                 # (__cdecl *func) or (__stdcall *one).
 218         &pop    ("ebp");
 219         &ret    ();
 220         }
 221 &function_end_B("OPENSSL_indirect_call");
 222
 223 &initseg("OPENSSL_cpuid_setup");
 224
 225 &asm_finish();