source: src/libcfa/interpose.c@ 93401f8

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 93401f8 was 169d944, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago

update abort, remove abortf, add printing exit
  • Property mode set to 100644
File size: 8.2 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 : Thu Feb 8 16:18:09 2018
13// Update Count : 75
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#include "bits/debug.h"
31#include "bits/defs.h"
32#include "bits/signal.h"
33#include "startup.h"
34
35//=============================================================================================
36// Interposing helpers
37//=============================================================================================
38
39typedef void (*generic_fptr_t)(void);
40generic_fptr_t interpose_symbol( const char* symbol, const char *version ) {
41 const char * error;
42
43 static void * library;
44 if ( ! library ) {
45 #if defined( RTLD_NEXT )
46 library = RTLD_NEXT;
47 #else
48 // missing RTLD_NEXT => must hard-code library name, assuming libstdc++
49 library = dlopen( "libc.so.6", RTLD_LAZY );
50 error = dlerror();
51 if ( error ) {
52 abort( "interpose_symbol : failed to open libc, %s\n", error );
53 }
54 #endif
55 } // if
56
57 union { generic_fptr_t fptr; void* ptr; } originalFunc;
58
59 #if defined( _GNU_SOURCE )
60 if ( version ) {
61 originalFunc.ptr = dlvsym( library, symbol, version );
62 } else {
63 originalFunc.ptr = dlsym( library, symbol );
64 }
65 #else
66 originalFunc.ptr = dlsym( library, symbol );
67 #endif // _GNU_SOURCE
68
69 error = dlerror();
70 if ( error ) abort( "interpose_symbol : internal error, %s\n", error );
71
72 return originalFunc.fptr;
73}
74
75forall(dtype T)
76static inline void ptr_from_symbol( T** symbol_ptr, const char * symbol_name, const char * version) {
77 union {
78 generic_fptr_t gp;
79 T* tp;
80 } u;
81
82 u.gp = interpose_symbol( symbol_name, version );
83
84 *symbol_ptr = u.tp;
85}
86
87#define INTERPOSE_LIBC( x, ver ) ptr_from_symbol( (void**)&__cabi_libc.x, #x, ver)
88
89//=============================================================================================
90// Terminating Signals logic
91//=============================================================================================
92
93void sigHandler_segv ( __CFA_SIGPARMS__ );
94void sigHandler_ill ( __CFA_SIGPARMS__ );
95void sigHandler_fpe ( __CFA_SIGPARMS__ );
96void sigHandler_abort( __CFA_SIGPARMS__ );
97
98struct {
99 void (* exit)( int ) __attribute__ (( __noreturn__ ));
100 void (* abort)( void ) __attribute__ (( __noreturn__ ));
101} __cabi_libc;
102
103extern "C" {
104 void __cfaabi_interpose_startup(void) __attribute__(( constructor( STARTUP_PRIORITY_CORE ) ));
105 void __cfaabi_interpose_startup( void ) {
106 const char *version = NULL;
107
108 INTERPOSE_LIBC( abort, version );
109 INTERPOSE_LIBC( exit , version );
110
111 __cfaabi_sigaction( SIGSEGV, sigHandler_segv , SA_SIGINFO ); // Failure handler
112 __cfaabi_sigaction( SIGBUS , sigHandler_segv , SA_SIGINFO ); // Failure handler
113 __cfaabi_sigaction( SIGILL , sigHandler_ill , SA_SIGINFO ); // Failure handler
114 __cfaabi_sigaction( SIGFPE , sigHandler_fpe , SA_SIGINFO ); // Failure handler
115 __cfaabi_sigaction( SIGABRT, sigHandler_abort, SA_SIGINFO ); // Failure handler
116 }
117}
118
119//=============================================================================================
120// Terminating Signals logic
121//=============================================================================================
122
123// Forward declare abort after the __typeof__ call to avoid ambiguities
124void exit( int status, const char fmt[], ... ) __attribute__ (( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ ));
125void abort( const char fmt[], ... ) __attribute__ (( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ ));
126
127extern "C" {
128 void abort( void ) __attribute__ (( __nothrow__, __leaf__, __noreturn__ )) {
129 abort( NULL );
130 }
131
132 void __cabi_abort( const char fmt[], ... ) __attribute__ (( format(printf, 1, 2), __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 exit( int status, const char fmt[], ... ) __attribute__ (( format(printf, 2, 3), __nothrow__, __leaf__, __noreturn__ )) {
153 va_list args;
154 va_start( args, fmt );
155 vfprintf( stderr, fmt, args );
156 va_end( args );
157 __cabi_libc.exit( status );
158}
159
160void abort( const char fmt[], ... ) __attribute__ (( format(printf, 1, 2), __nothrow__, __leaf__, __noreturn__ )) {
161 void * kernel_data = kernel_abort(); // must be done here to lock down kernel
162 int len;
163
164 abort_lastframe = kernel_abort_lastframe();
165 len = snprintf( abort_text, abort_text_size, "Cforall Runtime error (UNIX pid:%ld) ", (long int)getpid() ); // use UNIX pid (versus getPid)
166 __cfaabi_dbg_bits_write( abort_text, len );
167
168 if ( fmt ) {
169 va_list args;
170 va_start( args, fmt );
171
172 len = vsnprintf( abort_text, abort_text_size, fmt, args );
173 va_end( args );
174 __cfaabi_dbg_bits_write( abort_text, len );
175
176 if ( fmt[strlen( fmt ) - 1] != '\n' ) { // add optional newline if missing at the end of the format text
177 __cfaabi_dbg_bits_write( "\n", 1 );
178 }
179 }
180
181 kernel_abort_msg( kernel_data, abort_text, abort_text_size );
182 __cabi_libc.abort();
183}
184
185static void __cfaabi_backtrace() {
186 enum {
187 Frames = 50, // maximum number of stack frames
188 Start = 8, // skip first N stack frames
189 };
190
191 void * array[Frames];
192 size_t size = backtrace( array, Frames );
193 char ** messages = backtrace_symbols( array, size );
194
195 // find executable name
196 *index( messages[0], '(' ) = '\0';
197 __cfaabi_dbg_bits_print_nolock( "Stack back trace for: %s\n", messages[0]);
198
199 for ( int i = Start; i < size - abort_lastframe && messages != NULL; i += 1 ) {
200 char * name = NULL, * offset_begin = NULL, * offset_end = NULL;
201
202 for ( char * p = messages[i]; *p; ++p ) {
203 //__cfaabi_dbg_bits_print_nolock( "X %s\n", p);
204 // find parantheses and +offset
205 if ( *p == '(' ) {
206 name = p;
207 }
208 else if ( *p == '+' ) {
209 offset_begin = p;
210 }
211 else if ( *p == ')' ) {
212 offset_end = p;
213 break;
214 }
215 }
216
217 // if line contains symbol print it
218 int frameNo = i - Start;
219 if ( name && offset_begin && offset_end && name < offset_begin ) {
220 // delimit strings
221 *name++ = '\0';
222 *offset_begin++ = '\0';
223 *offset_end++ = '\0';
224
225 __cfaabi_dbg_bits_print_nolock( "(%i) %s : %s + %s %s\n", frameNo, messages[i], name, offset_begin, offset_end);
226 }
227 // otherwise, print the whole line
228 else {
229 __cfaabi_dbg_bits_print_nolock( "(%i) %s\n", frameNo, messages[i] );
230 }
231 }
232 free( messages );
233}
234
235void sigHandler_segv( __CFA_SIGPARMS__ ) {
236 abort( "Addressing invalid memory at location %p\n"
237 "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",
238 sfp->si_addr );
239}
240
241void sigHandler_ill( __CFA_SIGPARMS__ ) {
242 abort( "Executing illegal instruction at location %p.\n"
243 "Possible cause is stack corruption.\n",
244 sfp->si_addr );
245}
246
247void sigHandler_fpe( __CFA_SIGPARMS__ ) {
248 const char * msg;
249
250 choose( sfp->si_code ) {
251 case FPE_INTDIV, FPE_FLTDIV: msg = "divide by zero";
252 case FPE_FLTOVF: msg = "overflow";
253 case FPE_FLTUND: msg = "underflow";
254 case FPE_FLTRES: msg = "inexact result";
255 case FPE_FLTINV: msg = "invalid operation";
256 default: msg = "unknown";
257 } // choose
258 abort( "Computation error %s at location %p.\n", msg, sfp->si_addr );
259}
260
261void sigHandler_abort( __CFA_SIGPARMS__ ) {
262 __cfaabi_backtrace();
263
264 // reset default signal handler
265 __cfaabi_sigdefault( SIGABRT );
266
267 raise( SIGABRT );
268}
269
270// Local Variables: //
271// mode: c //
272// tab-width: 4 //
273// End: //
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