source: src/libcfa/interpose.c@ 4dad189

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since 4dad189 was 3d5f2ef1, checked in by Thierry Delisle <tdelisle@…>, 8 years ago

Cleanup in interpose.c
  • Property mode set to 100644
File size: 7.8 KB
Line 
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
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Wed Feb 7 09:05:18 2018
13// Update Count : 59
14//
15
16#include <stdarg.h>
17#include <stddef.h>
18
19extern "C" {
20#include <stdio.h>
21#include <string.h>
22#include <dlfcn.h>
23#include <unistd.h>
24#define __USE_GNU
25#include <signal.h>
26#undef __USE_GNU
27#include <execinfo.h>
28}
29
30#define __NO_ABORT_OVERLOAD // no abort overload avoid ambiguities
31#include "bits/debug.h"
32#include "bits/defs.h"
33#include "bits/signal.h"
34#include "startup.h"
35
36//=============================================================================================
37// Interposing helpers
38//=============================================================================================
39
40typedef void (*generic_fptr_t)(void);
41generic_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;
59
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
69
70 error = dlerror();
71 if ( error ) abortf( "interpose_symbol : internal error, %s\n", error );
72
73 return originalFunc.fptr;
74}
75
76forall(dtype T)
77static inline void ptr_from_symbol( T** symbol_ptr, const char * symbol_name, const char * version) {
78 union {
79 generic_fptr_t gp;
80 T* tp;
81 } u;
82
83 u.gp = interpose_symbol( symbol_name, version );
84
85 *symbol_ptr = u.tp;
86}
87
88#define INTERPOSE_LIBC( x, ver ) ptr_from_symbol( (void**)&__cabi_libc.x, #x, ver)
89
90//=============================================================================================
91// Terminating Signals logic
92//=============================================================================================
93
94void sigHandler_segv ( __CFA_SIGPARMS__ );
95void sigHandler_ill ( __CFA_SIGPARMS__ );
96void sigHandler_fpe ( __CFA_SIGPARMS__ );
97void sigHandler_abort( __CFA_SIGPARMS__ );
98
99struct {
100 __typeof__( exit ) exit __attribute__(( noreturn ));
101 __typeof__( abort ) abort __attribute__(( noreturn ));
102} __cabi_libc;
103
104extern "C" {
105 void __cfaabi_interpose_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_CORE ) ));
106 void __cfaabi_interpose_startup( void ) {
107 const char *version = NULL;
108
109 INTERPOSE_LIBC( abort, version );
110 INTERPOSE_LIBC( exit , version );
111
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
117 }
118}
119
120//=============================================================================================
121// Terminating Signals logic
122//=============================================================================================
123
124// Forward declare abort after the __typeof__ call to avoid ambiguities
125void abort ( const char fmt[], ... ) __attribute__ ((__nothrow__, __leaf__, __noreturn__));
126
127extern "C" {
128 void abort( void ) __attribute__ ((__nothrow__, __leaf__, __noreturn__)) {
129 abortf( NULL );
130 }
131
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 );
137 }
138
139 void exit( int __status ) __attribute__ ((__nothrow__, __leaf__, __noreturn__)) {
140 __cabi_libc.exit(__status);
141 }
142}
143
144void * kernel_abort ( void ) __attribute__ ((__nothrow__, __leaf__, __weak__)) { return NULL; }
145void kernel_abort_msg( void * data, char * buffer, int size ) __attribute__ ((__nothrow__, __leaf__, __weak__)) {}
146int kernel_abort_lastframe( void ) __attribute__ ((__nothrow__, __leaf__, __weak__)) { return 4; }
147
148enum { abort_text_size = 1024 };
149static char abort_text[ abort_text_size ];
150static int abort_lastframe;
151
152void 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;
155
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 );
159
160 if ( fmt ) {
161 va_list args;
162 va_start( args, fmt );
163
164 len = vsnprintf( abort_text, abort_text_size, fmt, args );
165 va_end( args );
166 __cfaabi_dbg_bits_write( abort_text, len );
167
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 );
170 }
171 }
172
173 kernel_abort_msg( kernel_data, abort_text, abort_text_size );
174 __cabi_libc.abort();
175}
176
177static void __cfaabi_backtrace() {
178 enum {
179 Frames = 50, // maximum number of stack frames
180 Start = 8, // skip first N stack frames
181 };
182
183 void * array[Frames];
184 size_t size = backtrace( array, Frames );
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
191 for ( int i = Start; i < size - abort_lastframe && messages != NULL; i += 1 ) {
192 char * name = NULL, * offset_begin = NULL, * offset_end = NULL;
193
194 for ( char * p = messages[i]; *p; ++p ) {
195 //__cfaabi_dbg_bits_print_nolock( "X %s\n", p);
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
210 int frameNo = i - Start;
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
227void sigHandler_segv( __CFA_SIGPARMS__ ) {
228 abortf( "Addressing invalid memory at location %p\n"
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
233void sigHandler_ill( __CFA_SIGPARMS__ ) {
234 abortf( "Executing illegal instruction at location %p.\n"
235 "Possible cause is stack corruption.\n",
236 sfp->si_addr );
237}
238
239void sigHandler_fpe( __CFA_SIGPARMS__ ) {
240 const char * msg;
241
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";
248 default: msg = "unknown";
249 } // choose
250 abortf( "Computation error %s at location %p.\n", msg, sfp->si_addr );
251}
252
253void sigHandler_abort( __CFA_SIGPARMS__ ) {
254 __cfaabi_backtrace();
255
256 // reset default signal handler
257 __cfaabi_sigdefault( SIGABRT );
258
259 raise( SIGABRT );
260}
261
262// Local Variables: //
263// mode: c //
264// tab-width: 4 //
265// End: //
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