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#include <iostream>
#include "pin.H"

// unmatched_syscall_ip keeps track of the IP of the last syscall encounted.
// It is set before the syscall and reset afterward. Therefore, if the
// afterward instrumentation is bypassed, which could happen due to the funny
// control flow in sysenter on x86, then we will see a non-zero value in
// unmatched_syscall_ip when we execute the next syscall.

ADDRINT unmatched_syscall_ip = 0;

VOID BeforeSyscall(ADDRINT ip)
{
    if (unmatched_syscall_ip != 0)
    {
        printf("AfterSyscall() is not executed after the syscall at %x\n",
               unmatched_syscall_ip);
        fflush(stdout);
        exit(1);
    }
    
    unmatched_syscall_ip = ip;
}

VOID AfterSyscall(ADDRINT ip)
{
    unmatched_syscall_ip = 0;
}

VOID Instruction(INS ins, VOID *v)
{
    if (INS_IsSyscall(ins))
    {
        INS_InsertCall(ins, IPOINT_BEFORE, (AFUNPTR)BeforeSyscall, IARG_INST_PTR, IARG_END);
        INS_InsertCall(ins, IPOINT_AFTER, (AFUNPTR)AfterSyscall, IARG_INST_PTR, IARG_END);
    }
}

int main(INT32 argc, CHAR **argv)
{
    PIN_Init(argc, argv);
    
    INS_AddInstrumentFunction(Instruction, 0);
    
    // Never returns
    PIN_StartProgram();
    
    return 0;
}