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