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115 lines
3.3 KiB
115 lines
3.3 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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//
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// This tool demonstrates how to get the value of the application's
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// errno on linux in jit mode.
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//
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// There are symbols called __errno_location in both libc and libpthread.
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// This test captures the address of the __errno_location() function in
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// one of the libraries and not in the other. Today, the implementations
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// in libc and libpthread point to the same actual location (in a TLS),
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// but this assumption is fragile and may change at some time int he future.
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#include "pin.H"
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#include <iostream>
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#include <stdlib.h>
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#include <errno.h>
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#include "tool_macros.h"
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using std::hex;
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using std::cerr;
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using std::endl;
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using std::cout;
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#if defined(TARGET_MAC)
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#define ERRNO_SYMBOL ("___error")
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#else
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#define ERRNO_SYMBOL ("__errno_location")
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#endif
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AFUNPTR pf_errno_location = 0;
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/* ===================================================================== */
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VOID ToolCheckError( CONTEXT * ctxt )
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{
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unsigned long err_loc;
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if ( *pf_errno_location != 0 )
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{
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cerr << "Tool: calling __errno_location()" << endl;
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PIN_CallApplicationFunction( ctxt, PIN_ThreadId(), CALLINGSTD_DEFAULT,
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pf_errno_location, NULL, PIN_PARG(unsigned long), &err_loc,
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PIN_PARG_END() );
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int err_value = *( reinterpret_cast< unsigned long *>(err_loc));
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cerr << "Tool: errno=" << err_value << endl;
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}
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else
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cerr << "Tool: __errno_location not found." << endl;
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}
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/* ===================================================================== */
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VOID ImageLoad(IMG img, VOID *v)
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{
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RTN errno_location_rtn = RTN_FindByName(img, ERRNO_SYMBOL);
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if (RTN_Valid(errno_location_rtn))
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{
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pf_errno_location = reinterpret_cast<AFUNPTR>(RTN_Address(errno_location_rtn));
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cerr << "Tool: Found __errno_location() at " << hex << (ADDRINT)pf_errno_location << "." << endl;
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}
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if ( IMG_IsMainExecutable( img ))
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{
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PROTO proto = PROTO_Allocate( PIN_PARG(void), CALLINGSTD_DEFAULT,
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"CheckError", PIN_PARG_END() );
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RTN rtn = RTN_FindByName(img, C_MANGLE("CheckError"));
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if (RTN_Valid(rtn))
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{
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cout << "Replacing " << RTN_Name(rtn) << " in " << IMG_Name(img) << endl;
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RTN_ReplaceSignature(rtn, AFUNPTR(ToolCheckError),
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IARG_PROTOTYPE, proto,
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IARG_CONTEXT,
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IARG_END);
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}
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PROTO_Free( proto );
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}
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}
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/* ===================================================================== */
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int main(INT32 argc, CHAR *argv[])
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{
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PIN_InitSymbols();
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PIN_Init(argc, argv);
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IMG_AddInstrumentFunction(ImageLoad, 0);
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PIN_StartProgram();
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return 0;
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}
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/* ===================================================================== */
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/* eof */
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/* ===================================================================== */
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