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Xash3D FWGS engine.
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xash3d-fwgs/engine/common/crashhandler.c

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/*
crashhandler.c - advanced crashhandler
Copyright (C) 2016 Mittorn
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#define _GNU_SOURCE
#include "common.h"
/*
================
Sys_Crash
Crash handler, called from system
================
*/
#define DEBUG_BREAK
/// TODO: implement on windows too
#if XASH_CRASHHANDLER == CRASHHANDLER_DBGHELP || XASH_CRASHHANDLER == CRASHHANDLER_WIN32
#if XASH_CRASHHANDLER == CRASHHANDLER_DBGHELP
#pragma comment( lib, "dbghelp" )
#pragma comment( lib, "psapi" )
#include <winnt.h>
#include <dbghelp.h>
#include <psapi.h>
#ifndef XASH_SDL
typedef ULONG_PTR DWORD_PTR, *PDWORD_PTR;
#endif
int ModuleName( HANDLE process, char *name, void *address, int len )
{
DWORD_PTR baseAddress = 0;
static HMODULE *moduleArray;
static unsigned int moduleCount;
LPBYTE moduleArrayBytes;
DWORD bytesRequired;
int i;
if(len < 3)
return 0;
if ( !moduleArray && EnumProcessModules( process, NULL, 0, &bytesRequired ) )
{
if ( bytesRequired )
{
moduleArrayBytes = (LPBYTE)LocalAlloc( LPTR, bytesRequired );
if ( moduleArrayBytes )
{
if( EnumProcessModules( process, (HMODULE *)moduleArrayBytes, bytesRequired, &bytesRequired ) )
{
moduleCount = bytesRequired / sizeof( HMODULE );
moduleArray = (HMODULE *)moduleArrayBytes;
}
}
}
}
for( i = 0; i<moduleCount; i++ )
{
MODULEINFO info;
GetModuleInformation( process, moduleArray[i], &info, sizeof(MODULEINFO) );
if( ( address > info.lpBaseOfDll ) &&
( (DWORD64)address < (DWORD64)info.lpBaseOfDll + (DWORD64)info.SizeOfImage ) )
return GetModuleBaseName( process, moduleArray[i], name, len );
}
return Q_snprintf(name, len, "???");
}
static void stack_trace( PEXCEPTION_POINTERS pInfo )
{
char message[1024];
int len = 0;
size_t i;
HANDLE process = GetCurrentProcess();
HANDLE thread = GetCurrentThread();
IMAGEHLP_LINE64 line;
DWORD dline = 0;
DWORD options;
CONTEXT context;
STACKFRAME64 stackframe;
DWORD image;
memcpy( &context, pInfo->ContextRecord, sizeof(CONTEXT) );
options = SymGetOptions();
options |= SYMOPT_DEBUG;
options |= SYMOPT_LOAD_LINES;
SymSetOptions( options );
SymInitialize( process, NULL, TRUE );
ZeroMemory( &stackframe, sizeof(STACKFRAME64) );
#ifdef _M_IX86
image = IMAGE_FILE_MACHINE_I386;
stackframe.AddrPC.Offset = context.Eip;
stackframe.AddrPC.Mode = AddrModeFlat;
stackframe.AddrFrame.Offset = context.Ebp;
stackframe.AddrFrame.Mode = AddrModeFlat;
stackframe.AddrStack.Offset = context.Esp;
stackframe.AddrStack.Mode = AddrModeFlat;
#elif _M_X64
image = IMAGE_FILE_MACHINE_AMD64;
stackframe.AddrPC.Offset = context.Rip;
stackframe.AddrPC.Mode = AddrModeFlat;
stackframe.AddrFrame.Offset = context.Rsp;
stackframe.AddrFrame.Mode = AddrModeFlat;
stackframe.AddrStack.Offset = context.Rsp;
stackframe.AddrStack.Mode = AddrModeFlat;
#elif _M_IA64
image = IMAGE_FILE_MACHINE_IA64;
stackframe.AddrPC.Offset = context.StIIP;
stackframe.AddrPC.Mode = AddrModeFlat;
stackframe.AddrFrame.Offset = context.IntSp;
stackframe.AddrFrame.Mode = AddrModeFlat;
stackframe.AddrBStore.Offset = context.RsBSP;
stackframe.AddrBStore.Mode = AddrModeFlat;
stackframe.AddrStack.Offset = context.IntSp;
stackframe.AddrStack.Mode = AddrModeFlat;
#endif
len += Q_snprintf( message + len, 1024 - len, "Sys_Crash: address %p, code %p\n", pInfo->ExceptionRecord->ExceptionAddress, (void*)pInfo->ExceptionRecord->ExceptionCode );
if( SymGetLineFromAddr64( process, (DWORD64)pInfo->ExceptionRecord->ExceptionAddress, &dline, &line ) )
{
len += Q_snprintf(message + len, 1024 - len,"Exception: %s:%d:%d\n", (char*)line.FileName, (int)line.LineNumber, (int)dline);
}
if( SymGetLineFromAddr64( process, stackframe.AddrPC.Offset, &dline, &line ) )
{
len += Q_snprintf(message + len, 1024 - len,"PC: %s:%d:%d\n", (char*)line.FileName, (int)line.LineNumber, (int)dline);
}
if( SymGetLineFromAddr64( process, stackframe.AddrFrame.Offset, &dline, &line ) )
{
len += Q_snprintf(message + len, 1024 - len,"Frame: %s:%d:%d\n", (char*)line.FileName, (int)line.LineNumber, (int)dline);
}
for( i = 0; i < 25; i++ )
{
char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(TCHAR)];
PSYMBOL_INFO symbol = (PSYMBOL_INFO)buffer;
BOOL result = StackWalk64(
image, process, thread,
&stackframe, &context, NULL,
SymFunctionTableAccess64, SymGetModuleBase64, NULL);
DWORD64 displacement = 0;
if( !result )
break;
symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
symbol->MaxNameLen = MAX_SYM_NAME;
len += Q_snprintf( message + len, 1024 - len, "% 2d %p", i, (void*)stackframe.AddrPC.Offset );
if( SymFromAddr( process, stackframe.AddrPC.Offset, &displacement, symbol ) )
{
len += Q_snprintf( message + len, 1024 - len, " %s ", symbol->Name );
}
if( SymGetLineFromAddr64( process, stackframe.AddrPC.Offset, &dline, &line ) )
{
len += Q_snprintf(message + len, 1024 - len,"(%s:%d:%d) ", (char*)line.FileName, (int)line.LineNumber, (int)dline);
}
len += Q_snprintf( message + len, 1024 - len, "(");
len += ModuleName( process, message + len, (void*)stackframe.AddrPC.Offset, 1024 - len );
len += Q_snprintf( message + len, 1024 - len, ")\n");
}
#ifdef XASH_SDL
if( host.type != HOST_DEDICATED ) // let system to restart server automaticly
SDL_ShowSimpleMessageBox( SDL_MESSAGEBOX_ERROR,"Sys_Crash", message, host.hWnd );
#endif
Sys_PrintLog(message);
SymCleanup(process);
}
#endif //DBGHELP
LPTOP_LEVEL_EXCEPTION_FILTER oldFilter;
long _stdcall Sys_Crash( PEXCEPTION_POINTERS pInfo )
{
// save config
if( host.status != HOST_CRASHED )
{
// check to avoid recursive call
host.crashed = true;
#if XASH_CRASHHANDLER == CRASHHANDLER_DBGHELP
stack_trace( pInfo );
#else
Sys_Warn( "Sys_Crash: call %p at address %p", pInfo->ExceptionRecord->ExceptionAddress, pInfo->ExceptionRecord->ExceptionCode );
#endif
if( host.type == HOST_NORMAL )
CL_Crashed(); // tell client about crash
else host.status = HOST_CRASHED;
if( host_developer.value <= 0 )
{
// no reason to call debugger in release build - just exit
Sys_Quit();
return EXCEPTION_CONTINUE_EXECUTION;
}
// all other states keep unchanged to let debugger find bug
Sys_DestroyConsole();
}
if( oldFilter )
return oldFilter( pInfo );
return EXCEPTION_CONTINUE_EXECUTION;
}
void Sys_SetupCrashHandler( void )
{
SetErrorMode( SEM_FAILCRITICALERRORS ); // no abort/retry/fail errors
oldFilter = SetUnhandledExceptionFilter( Sys_Crash );
host.hInst = GetModuleHandle( NULL );
}
void Sys_RestoreCrashHandler( void )
{
// restore filter
if( oldFilter ) SetUnhandledExceptionFilter( oldFilter );
}
#elif XASH_CRASHHANDLER == CRASHHANDLER_UCONTEXT
// Posix signal handler
#include "library.h"
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__ANDROID__) || defined(__linux__)
#define HAVE_UCONTEXT_H 1
#endif
#ifdef HAVE_UCONTEXT_H
#include <ucontext.h>
#endif
#include <signal.h>
#include <sys/mman.h>
int printframe( char *buf, int len, int i, void *addr )
{
Dl_info dlinfo;
if( len <= 0 )
return 0; // overflow
if( dladdr( addr, &dlinfo ))
{
if( dlinfo.dli_sname )
return Q_snprintf( buf, len, "%2d: %p <%s+%lu> (%s)\n", i, addr, dlinfo.dli_sname,
(unsigned long)addr - (unsigned long)dlinfo.dli_saddr, dlinfo.dli_fname ); // print symbol, module and address
else
return Q_snprintf( buf, len, "%2d: %p (%s)\n", i, addr, dlinfo.dli_fname ); // print module and address
}
else
return Q_snprintf( buf, len, "%2d: %p\n", i, addr ); // print only address
}
struct sigaction oldFilter;
#define STACK_BACKTRACE_STR_LEN 17
#define STACK_BACKTRACE_STR "Stack backtrace:\n"
#define STACK_DUMP_STR_LEN 12
#define STACK_DUMP_STR "Stack dump:\n"
#define ALIGN( x, y ) (((int) (x) + ((y)-1)) & ~((y)-1))
static void Sys_Crash( int signal, siginfo_t *si, void *context)
{
void *pc, **bp, **sp; // this must be set for every OS!
char message[8192];
int len, logfd, i = 0;
size_t pagesize;
#if defined(__OpenBSD__)
struct sigcontext *ucontext = (struct sigcontext*)context;
#else
ucontext_t *ucontext = (ucontext_t*)context;
#endif
#if defined(__x86_64__)
#if defined(__FreeBSD__)
pc = (void*)ucontext->uc_mcontext.mc_rip;
bp = (void**)ucontext->uc_mcontext.mc_rbp;
sp = (void**)ucontext->uc_mcontext.mc_rsp;
#elif defined(__NetBSD__)
pc = (void*)ucontext->uc_mcontext.__gregs[REG_RIP];
bp = (void**)ucontext->uc_mcontext.__gregs[REG_RBP];
sp = (void**)ucontext->uc_mcontext.__gregs[REG_RSP];
#elif defined(__OpenBSD__)
pc = (void*)ucontext->sc_rip;
bp = (void**)ucontext->sc_rbp;
sp = (void**)ucontext->sc_rsp;
#else
pc = (void*)ucontext->uc_mcontext.gregs[REG_RIP];
bp = (void**)ucontext->uc_mcontext.gregs[REG_RBP];
sp = (void**)ucontext->uc_mcontext.gregs[REG_RSP];
#endif
#elif defined(__i386__)
#if defined(__FreeBSD__)
pc = (void*)ucontext->uc_mcontext.mc_eip;
bp = (void**)ucontext->uc_mcontext.mc_ebp;
sp = (void**)ucontext->uc_mcontext.mc_esp;
#elif defined(__NetBSD__)
pc = (void*)ucontext->uc_mcontext.__gregs[REG_EIP];
bp = (void**)ucontext->uc_mcontext.__gregs[REG_EBP];
sp = (void**)ucontext->uc_mcontext.__gregs[REG_ESP];
#elif defined(__OpenBSD__)
pc = (void*)ucontext->sc_eip;
bp = (void**)ucontext->sc_ebp;
sp = (void**)ucontext->sc_esp;
#else
pc = (void*)ucontext->uc_mcontext.gregs[REG_EIP];
bp = (void**)ucontext->uc_mcontext.gregs[REG_EBP];
sp = (void**)ucontext->uc_mcontext.gregs[REG_ESP];
#endif
#elif defined(__aarch64__) // arm not tested
pc = (void*)ucontext->uc_mcontext.pc;
bp = (void*)ucontext->uc_mcontext.regs[29];
sp = (void*)ucontext->uc_mcontext.sp;
#elif defined(__arm__)
pc = (void*)ucontext->uc_mcontext.arm_pc;
bp = (void*)ucontext->uc_mcontext.arm_fp;
sp = (void*)ucontext->uc_mcontext.arm_sp;
#else
#error "Unknown arch!!!"
#endif
// safe actions first, stack and memory may be corrupted
len = Q_snprintf( message, sizeof( message ), "Ver: %s %s (build %i-%s, %s-%s)\n",
XASH_ENGINE_NAME, XASH_VERSION, Q_buildnum(), Q_buildcommit(), Q_buildos(), Q_buildarch() );
#if !defined(__FreeBSD__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
len += Q_snprintf( message + len, sizeof( message ) - len, "Crash: signal %d errno %d with code %d at %p %p\n", signal, si->si_errno, si->si_code, si->si_addr, si->si_ptr );
#else
len += Q_snprintf( message + len, sizeof( message ) - len, "Crash: signal %d errno %d with code %d at %p\n", signal, si->si_errno, si->si_code, si->si_addr );
#endif
write( 2, message, len );
// flush buffers before writing directly to descriptors
fflush( stdout );
fflush( stderr );
// now get log fd and write trace directly to log
logfd = Sys_LogFileNo();
write( logfd, message, len );
// try to print backtrace
write( 2, STACK_BACKTRACE_STR, STACK_BACKTRACE_STR_LEN );
write( logfd, STACK_BACKTRACE_STR, STACK_BACKTRACE_STR_LEN );
strncpy( message + len, STACK_BACKTRACE_STR, sizeof( message ) - len );
len += STACK_BACKTRACE_STR_LEN;
pagesize = sysconf( _SC_PAGESIZE );
do
{
int line = printframe( message + len, sizeof( message ) - len, ++i, pc);
write( 2, message + len, line );
write( logfd, message + len, line );
len += line;
//if( !dladdr(bp,0) ) break; // only when bp is in module
if( ( mprotect( (char *)ALIGN( bp, pagesize ), pagesize, PROT_READ | PROT_WRITE | PROT_EXEC ) == -1) &&
( mprotect( (char *)ALIGN( bp, pagesize ), pagesize, PROT_READ | PROT_EXEC ) == -1) &&
( mprotect( (char *)ALIGN( bp, pagesize ), pagesize, PROT_READ | PROT_WRITE ) == -1) &&
( mprotect( (char *)ALIGN( bp, pagesize ), pagesize, PROT_READ ) == -1) )
break;
if( ( mprotect( (char *)ALIGN( bp[0], pagesize ), pagesize, PROT_READ | PROT_WRITE | PROT_EXEC ) == -1) &&
( mprotect( (char *)ALIGN( bp[0], pagesize ), pagesize, PROT_READ | PROT_EXEC ) == -1) &&
( mprotect( (char *)ALIGN( bp[0], pagesize ), pagesize, PROT_READ | PROT_WRITE ) == -1) &&
( mprotect( (char *)ALIGN( bp[0], pagesize ), pagesize, PROT_READ ) == -1) )
break;
pc = bp[1];
bp = (void**)bp[0];
}
while( bp && i < 128 );
// try to print stack
write( 2, STACK_DUMP_STR, STACK_DUMP_STR_LEN );
write( logfd, STACK_DUMP_STR, STACK_DUMP_STR_LEN );
strncpy( message + len, STACK_DUMP_STR, sizeof( message ) - len );
len += STACK_DUMP_STR_LEN;
if( ( mprotect((char *)ALIGN( sp, pagesize ), pagesize, PROT_READ | PROT_WRITE | PROT_EXEC ) != -1) ||
( mprotect((char *)ALIGN( sp, pagesize ), pagesize, PROT_READ | PROT_EXEC ) != -1) ||
( mprotect((char *)ALIGN( sp, pagesize ), pagesize, PROT_READ | PROT_WRITE ) != -1) ||
( mprotect((char *)ALIGN( sp, pagesize ), pagesize, PROT_READ ) != -1) )
{
for( i = 0; i < 32; i++ )
{
int line = printframe( message + len, sizeof( message ) - len, i, sp[i] );
write( 2, message + len, line );
write( logfd, message + len, line );
len += line;
}
}
// put MessageBox as Sys_Error
Msg( "%s\n", message );
#ifdef XASH_SDL
SDL_SetWindowGrab( host.hWnd, SDL_FALSE );
#endif
MSGBOX( message );
// log saved, now we can try to save configs and close log correctly, it may crash
if( host.type == HOST_NORMAL )
CL_Crashed();
host.status = HOST_CRASHED;
host.crashed = true;
Sys_Quit();
}
void Sys_SetupCrashHandler( void )
{
struct sigaction act;
act.sa_sigaction = Sys_Crash;
act.sa_flags = SA_SIGINFO | SA_ONSTACK;
sigaction( SIGSEGV, &act, &oldFilter );
sigaction( SIGABRT, &act, &oldFilter );
sigaction( SIGBUS, &act, &oldFilter );
sigaction( SIGILL, &act, &oldFilter );
}
void Sys_RestoreCrashHandler( void )
{
sigaction( SIGSEGV, &oldFilter, NULL );
sigaction( SIGABRT, &oldFilter, NULL );
sigaction( SIGBUS, &oldFilter, NULL );
sigaction( SIGILL, &oldFilter, NULL );
}
#elif XASH_CRASHHANDLER == CRASHHANDLER_NULL
void Sys_SetupCrashHandler( void )
{
// stub
}
void Sys_RestoreCrashHandler( void )
{
// stub
}
#endif