fips/fips_canister.c

   1 /* ====================================================================
   2  * Copyright (c) 2005 The OpenSSL Project. Rights for redistribution
   3  * and usage in source and binary forms are granted according to the
   4  * OpenSSL license.
   5  */
   6
   7 #include <stdio.h>
   8 #if defined(__DECC)
   9 # include <c_asm.h>
  10 # pragma __nostandard
  11 #endif
  12
  13 #include "e_os.h"
  14
  15 #if !defined(POINTER_TO_FUNCTION_IS_POINTER_TO_1ST_INSTRUCTION)
  16 # if    (defined(__sun) && (defined(__sparc) || defined(__sparcv9)))    || \
  17         (defined(__sgi) && (defined(__mips) || defined(mips)))          || \
  18         (defined(__osf__) && defined(__alpha))                          || \
  19         (defined(__linux) && (defined(__arm) || defined(__arm__)))      || \
  20         (defined(__i386) || defined(__i386__))                          || \
  21         (defined(__x86_64) || defined(__x86_64__))                      || \
  22         defined(__ANDROID__)                                            || \
  23         (defined(vax) || defined(__vax__))
  24 #  define POINTER_TO_FUNCTION_IS_POINTER_TO_1ST_INSTRUCTION
  25 # endif
  26 #endif
  27
  28 #if defined(__xlC__) && __xlC__>=0x600 && (defined(_POWER) || defined(_ARCH_PPC))
  29 static void *instruction_pointer_xlc(void);
  30 # pragma mc_func instruction_pointer_xlc {\
  31         "7c0802a6"      /* mflr r0  */  \
  32         "48000005"      /* bl   $+4 */  \
  33         "7c6802a6"      /* mflr r3  */  \
  34         "7c0803a6"      /* mtlr r0  */  }
  35 # pragma reg_killed_by instruction_pointer_xlc gr0 gr3
  36 # define INSTRUCTION_POINTER_IMPLEMENTED(ret) (ret=instruction_pointer_xlc());
  37 #endif
  38
  39 #ifdef FIPS_START
  40 #define FIPS_ref_point FIPS_text_start
  41 /* Some compilers put string literals into a separate segment. As we
  42  * are mostly interested to hash AES tables in .rodata, we declare
  43  * reference points accordingly. In case you wonder, the values are
  44  * big-endian encoded variable names, just to prevent these arrays
  45  * from being merged by linker. */
  46 const unsigned int FIPS_rodata_start[]=
  47         { 0x46495053, 0x5f726f64, 0x6174615f, 0x73746172 };
  48 #else
  49 #define FIPS_ref_point FIPS_text_end
  50 const unsigned int FIPS_rodata_end[]=
  51         { 0x46495053, 0x5f726f64, 0x6174615f, 0x656e645b };
  52 #endif
  53
  54 /*
  55  * I declare reference function as static in order to avoid certain
  56  * pitfalls in -dynamic linker behaviour...
  57  */
  58 static void *instruction_pointer(void)
  59 { void *ret=NULL;
  60 /* These are ABI-neutral CPU-specific snippets. ABI-neutrality means
  61  * that they are designed to work under any OS running on particular
  62  * CPU, which is why you don't find any #ifdef THIS_OR_THAT_OS in
  63  * this function. */
  64 #if     defined(INSTRUCTION_POINTER_IMPLEMENTED)
  65     INSTRUCTION_POINTER_IMPLEMENTED(ret);
  66 #elif   defined(__GNUC__) && __GNUC__>=2
  67 # if    defined(__alpha) || defined(__alpha__)
  68 #   define INSTRUCTION_POINTER_IMPLEMENTED
  69     __asm __volatile (  "br     %0,1f\n1:" : "=r"(ret) );
  70 # elif  defined(__i386) || defined(__i386__)
  71 #   define INSTRUCTION_POINTER_IMPLEMENTED
  72     __asm __volatile (  "call 1f\n1:    popl %0" : "=r"(ret) );
  73     ret = (void *)((size_t)ret&~3UL); /* align for better performance */
  74 # elif  defined(__ia64) || defined(__ia64__)
  75 #   define INSTRUCTION_POINTER_IMPLEMENTED
  76     __asm __volatile (  "mov    %0=ip" : "=r"(ret) );
  77 # elif  defined(__hppa) || defined(__hppa__) || defined(__pa_risc)
  78 #   define INSTRUCTION_POINTER_IMPLEMENTED
  79     __asm __volatile (  "blr    %%r0,%0\n\tnop" : "=r"(ret) );
  80     ret = (void *)((size_t)ret&~3UL); /* mask privilege level */
  81 # elif  defined(__mips) || defined(__mips__)
  82 #   define INSTRUCTION_POINTER_IMPLEMENTED
  83     void *scratch;
  84     __asm __volatile (  "move   %1,$31\n\t"     /* save ra */
  85                         "bal    .+8; nop\n\t"
  86                         "move   %0,$31\n\t"
  87                         "move   $31,%1"         /* restore ra */
  88                         : "=r"(ret),"=r"(scratch) );
  89 # elif  defined(__ppc__) || defined(__powerpc) || defined(__powerpc__) || \
  90         defined(__POWERPC__) || defined(_POWER) || defined(__PPC__) || \
  91         defined(__PPC64__) || defined(__powerpc64__)
  92 #   define INSTRUCTION_POINTER_IMPLEMENTED
  93     void *scratch;
  94     __asm __volatile (  "mfspr  %1,8\n\t"       /* save lr */
  95                         "bl     $+4\n\t"
  96                         "mfspr  %0,8\n\t"       /* mflr ret */
  97                         "mtspr  8,%1"           /* restore lr */
  98                         : "=r"(ret),"=r"(scratch) );
  99 # elif  defined(__s390__) || defined(__s390x__)
 100 #   define INSTRUCTION_POINTER_IMPLEMENTED
 101     __asm __volatile (  "bras   %0,1f\n1:" : "=r"(ret) );
 102     ret = (void *)((size_t)ret&~3UL);
 103 # elif  defined(__sparc) || defined(__sparc__) || defined(__sparcv9)
 104 #   define INSTRUCTION_POINTER_IMPLEMENTED
 105     void *scratch;
 106     __asm __volatile (  "mov    %%o7,%1\n\t"
 107                         "call   .+8; nop\n\t"
 108                         "mov    %%o7,%0\n\t"
 109                         "mov    %1,%%o7"
 110                         : "=r"(ret),"=r"(scratch) );
 111 # elif  defined(__x86_64) || defined(__x86_64__)
 112 #   define INSTRUCTION_POINTER_IMPLEMENTED
 113     __asm __volatile (  "leaq   0(%%rip),%0" : "=r"(ret) );
 114     ret = (void *)((size_t)ret&~3UL); /* align for better performance */
 115 # endif
 116 #elif   defined(__DECC) && defined(__alpha)
 117 #   define INSTRUCTION_POINTER_IMPLEMENTED
 118     ret = (void *)(size_t)asm("br %v0,1f\n1:");
 119 #elif   defined(_MSC_VER) && defined(_M_IX86)
 120 #   define INSTRUCTION_POINTER_IMPLEMENTED
 121     void *scratch;
 122     _asm {
 123             call    self
 124     self:   pop     eax
 125             mov     scratch,eax
 126          }
 127     ret = (void *)((size_t)scratch&~3UL);
 128 #endif
 129   return ret;
 130 }
 131
 132 /*
 133  * This function returns pointer to an instruction in the vicinity of
 134  * its entry point, but not outside this object module. This guarantees
 135  * that sequestered code is covered...
 136  */
 137 void *FIPS_ref_point()
 138 {
 139 #if     defined(INSTRUCTION_POINTER_IMPLEMENTED)
 140     return instruction_pointer();
 141 /* Below we essentially cover vendor compilers which do not support
 142  * inline assembler... */
 143 #elif   defined(_AIX)
 144     struct { void *ip,*gp,*env; } *p = (void *)instruction_pointer;
 145     return p->ip;
 146 #elif   defined(_HPUX_SOURCE)
 147 # if    defined(__hppa) || defined(__hppa__)
 148     struct { void *i[4]; } *p = (void *)FIPS_ref_point;
 149
 150     if (sizeof(p) == 8) /* 64-bit */
 151         return p->i[2];
 152     else if ((size_t)p & 2)
 153     {   p = (void *)((size_t)p&~3UL);
 154         return p->i[0];
 155     }
 156     else
 157         return (void *)p;
 158 # elif  defined(__ia64) || defined(__ia64__)
 159     struct { unsigned long long ip,gp; } *p=(void *)instruction_pointer;
 160     return (void *)(size_t)p->ip;
 161 # endif
 162 #elif   (defined(__VMS) || defined(VMS)) && !(defined(vax) || defined(__vax__))
 163     /* applies to both alpha and ia64 */
 164     struct { unsigned __int64 opaque,ip; } *p=(void *)instruction_pointer;
 165     return (void *)(size_t)p->ip;
 166 #elif   defined(__VOS__)
 167     /* applies to both pa-risc and ia32 */
 168     struct { void *dp,*ip,*gp; } *p = (void *)instruction_pointer;
 169     return p->ip;
 170 #elif   defined(_WIN32)
 171 # if    defined(_WIN64) && defined(_M_IA64)
 172     struct { void *ip,*gp; } *p = (void *)FIPS_ref_point;
 173     return p->ip;
 174 # else
 175     return (void *)FIPS_ref_point;
 176 # endif
 177 /*
 178  * In case you wonder why there is no #ifdef __linux. All Linux targets
 179  * are GCC-based and therefore are covered by instruction_pointer above
 180  * [well, some are covered by by the one below]...
 181  */
 182 #elif   defined(POINTER_TO_FUNCTION_IS_POINTER_TO_1ST_INSTRUCTION)
 183     return (void *)instruction_pointer;
 184 #else
 185     return NULL;
 186 #endif
 187 }