[9d944b2] | 1 | // |
---|
| 2 | // Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo |
---|
| 3 | // |
---|
| 4 | // The contents of this file are covered under the licence agreement in the |
---|
| 5 | // file "LICENCE" distributed with Cforall. |
---|
| 6 | // |
---|
| 7 | // interpose.c -- |
---|
| 8 | // |
---|
| 9 | // Author : Thierry Delisle |
---|
| 10 | // Created On : Wed Mar 29 16:10:31 2017 |
---|
[6b0b624] | 11 | // Last Modified By : Peter A. Buhr |
---|
[a424315d] | 12 | // Last Modified On : Wed Feb 7 09:05:18 2018 |
---|
| 13 | // Update Count : 59 |
---|
[9d944b2] | 14 | // |
---|
| 15 | |
---|
| 16 | #include <stdarg.h> |
---|
| 17 | #include <stddef.h> |
---|
| 18 | |
---|
| 19 | extern "C" { |
---|
| 20 | #include <stdio.h> |
---|
| 21 | #include <string.h> |
---|
| 22 | #include <dlfcn.h> |
---|
| 23 | #include <unistd.h> |
---|
[dbe9b08] | 24 | #define __USE_GNU |
---|
| 25 | #include <signal.h> |
---|
| 26 | #undef __USE_GNU |
---|
| 27 | #include <execinfo.h> |
---|
[9d944b2] | 28 | } |
---|
| 29 | |
---|
[3d5f2ef1] | 30 | #define __NO_ABORT_OVERLOAD // no abort overload avoid ambiguities |
---|
[875a72f] | 31 | #include "bits/debug.h" |
---|
[c2b9f21] | 32 | #include "bits/defs.h" |
---|
[dbe9b08] | 33 | #include "bits/signal.h" |
---|
[9d944b2] | 34 | #include "startup.h" |
---|
| 35 | |
---|
[3d5f2ef1] | 36 | //============================================================================================= |
---|
| 37 | // Interposing helpers |
---|
| 38 | //============================================================================================= |
---|
| 39 | |
---|
[9d944b2] | 40 | typedef void (*generic_fptr_t)(void); |
---|
| 41 | generic_fptr_t interpose_symbol( const char* symbol, const char *version ) { |
---|
| 42 | const char * error; |
---|
| 43 | |
---|
| 44 | static void * library; |
---|
| 45 | if ( ! library ) { |
---|
| 46 | #if defined( RTLD_NEXT ) |
---|
| 47 | library = RTLD_NEXT; |
---|
| 48 | #else |
---|
| 49 | // missing RTLD_NEXT => must hard-code library name, assuming libstdc++ |
---|
| 50 | library = dlopen( "libc.so.6", RTLD_LAZY ); |
---|
| 51 | error = dlerror(); |
---|
| 52 | if ( error ) { |
---|
| 53 | abortf( "interpose_symbol : failed to open libc, %s\n", error ); |
---|
| 54 | } |
---|
| 55 | #endif |
---|
| 56 | } // if |
---|
| 57 | |
---|
| 58 | union { generic_fptr_t fptr; void* ptr; } originalFunc; |
---|
[aca65621] | 59 | |
---|
[9d944b2] | 60 | #if defined( _GNU_SOURCE ) |
---|
| 61 | if ( version ) { |
---|
| 62 | originalFunc.ptr = dlvsym( library, symbol, version ); |
---|
| 63 | } else { |
---|
| 64 | originalFunc.ptr = dlsym( library, symbol ); |
---|
| 65 | } |
---|
| 66 | #else |
---|
| 67 | originalFunc.ptr = dlsym( library, symbol ); |
---|
| 68 | #endif // _GNU_SOURCE |
---|
[aca65621] | 69 | |
---|
[9d944b2] | 70 | error = dlerror(); |
---|
[aca65621] | 71 | if ( error ) abortf( "interpose_symbol : internal error, %s\n", error ); |
---|
[9d944b2] | 72 | |
---|
| 73 | return originalFunc.fptr; |
---|
| 74 | } |
---|
| 75 | |
---|
| 76 | forall(dtype T) |
---|
[3d5f2ef1] | 77 | static inline void ptr_from_symbol( T** symbol_ptr, const char * symbol_name, const char * version) { |
---|
[aca65621] | 78 | union { |
---|
[9d944b2] | 79 | generic_fptr_t gp; |
---|
[aca65621] | 80 | T* tp; |
---|
[9d944b2] | 81 | } u; |
---|
| 82 | |
---|
| 83 | u.gp = interpose_symbol( symbol_name, version ); |
---|
| 84 | |
---|
| 85 | *symbol_ptr = u.tp; |
---|
| 86 | } |
---|
| 87 | |
---|
[3d5f2ef1] | 88 | #define INTERPOSE_LIBC( x, ver ) ptr_from_symbol( (void**)&__cabi_libc.x, #x, ver) |
---|
| 89 | |
---|
| 90 | //============================================================================================= |
---|
| 91 | // Terminating Signals logic |
---|
| 92 | //============================================================================================= |
---|
[9d944b2] | 93 | |
---|
[dbe9b08] | 94 | void sigHandler_segv ( __CFA_SIGPARMS__ ); |
---|
[2b8bc41] | 95 | void sigHandler_ill ( __CFA_SIGPARMS__ ); |
---|
| 96 | void sigHandler_fpe ( __CFA_SIGPARMS__ ); |
---|
[dbe9b08] | 97 | void sigHandler_abort( __CFA_SIGPARMS__ ); |
---|
| 98 | |
---|
[3d5f2ef1] | 99 | struct { |
---|
| 100 | __typeof__( exit ) exit __attribute__(( noreturn )); |
---|
| 101 | __typeof__( abort ) abort __attribute__(( noreturn )); |
---|
| 102 | } __cabi_libc; |
---|
| 103 | |
---|
[6bfe5cc] | 104 | extern "C" { |
---|
| 105 | void __cfaabi_interpose_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_CORE ) )); |
---|
| 106 | void __cfaabi_interpose_startup( void ) { |
---|
| 107 | const char *version = NULL; |
---|
[9d944b2] | 108 | |
---|
[3d5f2ef1] | 109 | INTERPOSE_LIBC( abort, version ); |
---|
| 110 | INTERPOSE_LIBC( exit , version ); |
---|
[dbe9b08] | 111 | |
---|
[2b8bc41] | 112 | __cfaabi_sigaction( SIGSEGV, sigHandler_segv , SA_SIGINFO ); // Failure handler |
---|
| 113 | __cfaabi_sigaction( SIGBUS , sigHandler_segv , SA_SIGINFO ); // Failure handler |
---|
| 114 | __cfaabi_sigaction( SIGILL , sigHandler_ill , SA_SIGINFO ); // Failure handler |
---|
| 115 | __cfaabi_sigaction( SIGFPE , sigHandler_fpe , SA_SIGINFO ); // Failure handler |
---|
| 116 | __cfaabi_sigaction( SIGABRT, sigHandler_abort, SA_SIGINFO ); // Failure handler |
---|
[6bfe5cc] | 117 | } |
---|
[9d944b2] | 118 | } |
---|
| 119 | |
---|
[dbe9b08] | 120 | //============================================================================================= |
---|
| 121 | // Terminating Signals logic |
---|
| 122 | //============================================================================================= |
---|
| 123 | |
---|
[3d5f2ef1] | 124 | // Forward declare abort after the __typeof__ call to avoid ambiguities |
---|
| 125 | void abort ( const char fmt[], ... ) __attribute__ ((__nothrow__, __leaf__, __noreturn__)); |
---|
| 126 | |
---|
[9d944b2] | 127 | extern "C" { |
---|
[6bfe5cc] | 128 | void abort( void ) __attribute__ ((__nothrow__, __leaf__, __noreturn__)) { |
---|
[9d944b2] | 129 | abortf( NULL ); |
---|
| 130 | } |
---|
| 131 | |
---|
[3d5f2ef1] | 132 | void abortf( const char fmt[], ... ) __attribute__ ((__nothrow__, __leaf__, __noreturn__)) { |
---|
| 133 | va_list argp; |
---|
| 134 | va_start( argp, fmt ); |
---|
| 135 | abort( fmt, argp ); |
---|
| 136 | va_end( argp ); |
---|
[9d944b2] | 137 | } |
---|
| 138 | |
---|
[3d5f2ef1] | 139 | void exit( int __status ) __attribute__ ((__nothrow__, __leaf__, __noreturn__)) { |
---|
| 140 | __cabi_libc.exit(__status); |
---|
| 141 | } |
---|
[9d944b2] | 142 | } |
---|
| 143 | |
---|
[6bfe5cc] | 144 | void * kernel_abort ( void ) __attribute__ ((__nothrow__, __leaf__, __weak__)) { return NULL; } |
---|
| 145 | void kernel_abort_msg( void * data, char * buffer, int size ) __attribute__ ((__nothrow__, __leaf__, __weak__)) {} |
---|
[2b8bc41] | 146 | int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__, __leaf__, __weak__)) { return 4; } |
---|
[9d944b2] | 147 | |
---|
| 148 | enum { abort_text_size = 1024 }; |
---|
| 149 | static char abort_text[ abort_text_size ]; |
---|
[2b8bc41] | 150 | static int abort_lastframe; |
---|
[9d944b2] | 151 | |
---|
[3d5f2ef1] | 152 | void abort( const char fmt[], ... ) __attribute__ ((__nothrow__, __leaf__, __noreturn__)) { |
---|
| 153 | void * kernel_data = kernel_abort(); // must be done here to lock down kernel |
---|
| 154 | int len; |
---|
[9d944b2] | 155 | |
---|
[3d5f2ef1] | 156 | abort_lastframe = kernel_abort_lastframe(); |
---|
| 157 | len = snprintf( abort_text, abort_text_size, "Cforall Runtime error (UNIX pid:%ld) ", (long int)getpid() ); // use UNIX pid (versus getPid) |
---|
| 158 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[2b8bc41] | 159 | |
---|
[3d5f2ef1] | 160 | if ( fmt ) { |
---|
| 161 | va_list args; |
---|
| 162 | va_start( args, fmt ); |
---|
[9d944b2] | 163 | |
---|
[3d5f2ef1] | 164 | len = vsnprintf( abort_text, abort_text_size, fmt, args ); |
---|
| 165 | va_end( args ); |
---|
| 166 | __cfaabi_dbg_bits_write( abort_text, len ); |
---|
[9d944b2] | 167 | |
---|
[3d5f2ef1] | 168 | if ( fmt[strlen( fmt ) - 1] != '\n' ) { // add optional newline if missing at the end of the format text |
---|
| 169 | __cfaabi_dbg_bits_write( "\n", 1 ); |
---|
[2b8bc41] | 170 | } |
---|
[e464759] | 171 | } |
---|
[3d5f2ef1] | 172 | |
---|
| 173 | kernel_abort_msg( kernel_data, abort_text, abort_text_size ); |
---|
| 174 | __cabi_libc.abort(); |
---|
[aca65621] | 175 | } |
---|
[6b0b624] | 176 | |
---|
[2b8bc41] | 177 | static void __cfaabi_backtrace() { |
---|
| 178 | enum { |
---|
| 179 | Frames = 50, // maximum number of stack frames |
---|
| 180 | Start = 8, // skip first N stack frames |
---|
| 181 | }; |
---|
[dbe9b08] | 182 | |
---|
| 183 | void * array[Frames]; |
---|
[6bfe5cc] | 184 | size_t size = backtrace( array, Frames ); |
---|
[dbe9b08] | 185 | char ** messages = backtrace_symbols( array, size ); |
---|
| 186 | |
---|
| 187 | // find executable name |
---|
| 188 | *index( messages[0], '(' ) = '\0'; |
---|
| 189 | __cfaabi_dbg_bits_print_nolock( "Stack back trace for: %s\n", messages[0]); |
---|
| 190 | |
---|
[2b8bc41] | 191 | for ( int i = Start; i < size - abort_lastframe && messages != NULL; i += 1 ) { |
---|
| 192 | char * name = NULL, * offset_begin = NULL, * offset_end = NULL; |
---|
[dbe9b08] | 193 | |
---|
[2b8bc41] | 194 | for ( char * p = messages[i]; *p; ++p ) { |
---|
[6bfe5cc] | 195 | //__cfaabi_dbg_bits_print_nolock( "X %s\n", p); |
---|
[dbe9b08] | 196 | // find parantheses and +offset |
---|
| 197 | if ( *p == '(' ) { |
---|
| 198 | name = p; |
---|
| 199 | } |
---|
| 200 | else if ( *p == '+' ) { |
---|
| 201 | offset_begin = p; |
---|
| 202 | } |
---|
| 203 | else if ( *p == ')' ) { |
---|
| 204 | offset_end = p; |
---|
| 205 | break; |
---|
| 206 | } |
---|
| 207 | } |
---|
| 208 | |
---|
| 209 | // if line contains symbol print it |
---|
[2b8bc41] | 210 | int frameNo = i - Start; |
---|
[dbe9b08] | 211 | if ( name && offset_begin && offset_end && name < offset_begin ) { |
---|
| 212 | // delimit strings |
---|
| 213 | *name++ = '\0'; |
---|
| 214 | *offset_begin++ = '\0'; |
---|
| 215 | *offset_end++ = '\0'; |
---|
| 216 | |
---|
| 217 | __cfaabi_dbg_bits_print_nolock( "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end); |
---|
| 218 | } |
---|
| 219 | // otherwise, print the whole line |
---|
| 220 | else { |
---|
| 221 | __cfaabi_dbg_bits_print_nolock( "(%i) %s\n", frameNo, messages[i] ); |
---|
| 222 | } |
---|
| 223 | } |
---|
| 224 | free( messages ); |
---|
| 225 | } |
---|
| 226 | |
---|
| 227 | void sigHandler_segv( __CFA_SIGPARMS__ ) { |
---|
[a424315d] | 228 | abortf( "Addressing invalid memory at location %p\n" |
---|
[2b8bc41] | 229 | "Possible cause is reading outside the address space or writing to a protected area within the address space with an invalid pointer or subscript.\n", |
---|
| 230 | sfp->si_addr ); |
---|
| 231 | } |
---|
| 232 | |
---|
| 233 | void sigHandler_ill( __CFA_SIGPARMS__ ) { |
---|
[a424315d] | 234 | abortf( "Executing illegal instruction at location %p.\n" |
---|
[2b8bc41] | 235 | "Possible cause is stack corruption.\n", |
---|
| 236 | sfp->si_addr ); |
---|
| 237 | } |
---|
| 238 | |
---|
| 239 | void sigHandler_fpe( __CFA_SIGPARMS__ ) { |
---|
| 240 | const char * msg; |
---|
| 241 | |
---|
[a424315d] | 242 | choose( sfp->si_code ) { |
---|
| 243 | case FPE_INTDIV, FPE_FLTDIV: msg = "divide by zero"; |
---|
| 244 | case FPE_FLTOVF: msg = "overflow"; |
---|
| 245 | case FPE_FLTUND: msg = "underflow"; |
---|
| 246 | case FPE_FLTRES: msg = "inexact result"; |
---|
| 247 | case FPE_FLTINV: msg = "invalid operation"; |
---|
[2b8bc41] | 248 | default: msg = "unknown"; |
---|
[a424315d] | 249 | } // choose |
---|
| 250 | abortf( "Computation error %s at location %p.\n", msg, sfp->si_addr ); |
---|
[dbe9b08] | 251 | } |
---|
| 252 | |
---|
| 253 | void sigHandler_abort( __CFA_SIGPARMS__ ) { |
---|
[2b8bc41] | 254 | __cfaabi_backtrace(); |
---|
[dbe9b08] | 255 | |
---|
| 256 | // reset default signal handler |
---|
[2b8bc41] | 257 | __cfaabi_sigdefault( SIGABRT ); |
---|
[dbe9b08] | 258 | |
---|
| 259 | raise( SIGABRT ); |
---|
| 260 | } |
---|
| 261 | |
---|
[6b0b624] | 262 | // Local Variables: // |
---|
| 263 | // mode: c // |
---|
| 264 | // tab-width: 4 // |
---|
| 265 | // End: // |
---|