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/*
 *  This file contains an ISA-portable PIN tool for tracing system calls
 */

#include <stdio.h>

#if defined(TARGET_MAC)
#include <sys/syscall.h>
#else
#include <syscall.h>
#endif

#include "pin.H"


FILE * trace;


// Print syscall number and arguments
VOID SysBefore(VOID * ip, INT32 num, VOID * arg0, VOID * arg1, VOID * arg2, VOID * arg3, VOID * arg4, VOID * arg5)
{
#if defined(TARGET_IA32) 
    // On ia32, there are only 5 registers for passing system call arguments, 
    // but mmap needs 6. For mmap on ia32, the first argument to the system call 
    // is a pointer to an array of the 6 arguments
    if (num == SYS_mmap)
    {
        VOID ** mmapArgs = static_cast<VOID**>(arg0);
        arg0 = mmapArgs[0];
        arg1 = mmapArgs[1];
        arg2 = mmapArgs[2];
        arg3 = mmapArgs[3];
        arg4 = mmapArgs[4];
        arg5 = mmapArgs[5];
    }
#endif

    fprintf(trace,"%p: %d(%p, %p, %p, %p, %p, %p)", ip, num, arg0, arg1, arg2, arg3, arg4, arg5);
}

// Print the return value of the system call
VOID SysAfter(VOID * ret)
{
    fprintf(trace,"returns: %p\n", ret);
    fflush(trace);
}

// Is called for every instruction and instruments syscalls
VOID Instruction(INS ins, VOID *v)
{
    if (INS_IsSyscall(ins))
    {
        // Arguments and syscall number is only available before
        INS_InsertCall(ins, IPOINT_BEFORE, AFUNPTR(SysBefore),
                       IARG_INST_PTR, IARG_SYSCALL_NUMBER,
                       IARG_SYSARG_VALUE, 0, IARG_SYSARG_VALUE, 1,
                       IARG_SYSARG_VALUE, 2, IARG_SYSARG_VALUE, 3,
                       IARG_SYSARG_VALUE, 4, IARG_SYSARG_VALUE, 5,
                       IARG_END);

        // return value only available after
        INS_InsertCall(ins, IPOINT_AFTER, AFUNPTR(SysAfter),
                       IARG_SYSRET_VALUE,
                       IARG_END);
    }
}

VOID Fini(INT32 code, VOID *v)
{
    fprintf(trace,"#eof\n");
    fclose(trace);
}


int main(int argc, char *argv[])
{
    PIN_Init(argc, argv);

    trace = fopen("strace.out", "w");

    INS_AddInstrumentFunction(Instruction, 0);
    PIN_AddFiniFunction(Fini, 0);

    // Never returns
    PIN_StartProgram();
    
    return 0;
}