今天又重新拾起cosim，却发现怎么编译都报错，找了之前的ppt，又仔细观摩了NC的systemverilog.pdf，就是不行，老是报这个错误：

icds:liawang@shaltc01:[~/nc_prj/nc_dpi_first]> ncsim -sv_lib hello hello

ncsim: 09.20-s016: (c) Copyright 1995-2010 Cadence Design Systems, Inc.

ncsim: *W,NOLDPI: Unable to load hello.

OSDLERROR: ./hello.so: cannot open shared object file: No such file or directory or file is not valid ELFCLASS32 library..

ncsim: *F,NOFDPI: Function pass_string_c not found in any of the shared object specified with -SV_LIB switch.

我简直头大，一切都是按照Cadence的sysverilog.pdf来的啊，怎么就能出错呢？？

ncvlog -sv hello.sv

ncelab -access +RWC hello

gcc -fPIC -shared -o libdpi.so hello.c -I /tools/ius-9.20.016/tools/inca/include

ncsim -messages hello

显然是c语言文件生成的so文件没有被ncsim正确load，那么问题出在哪儿呢？问题大概出现在gcc的编译选项上。后来看了之前自己的笔记，发现这个gcc的编译选项漏了-m32，加上以后真的就好了！！

icds:liawang@shaltc01:[~/nc_prj/nc_dpi_first]> ncsim -sv_lib hello hello

ncsim: 09.20-s016: (c) Copyright 1995-2010 Cadence Design Systems, Inc.

ncsim> run

DPI: pass it ON

Exported Verilog String=
string passed from C

Verilog: C: give up a string

Gimme String

Simulation complete via $finish(1) at time 0 FS + 0

./hello.sv:22
$finish;

ncsim> exit

下面两个文件分别是设计文件和c文件，后面还有在nc环境下的仿真命令：

//hello.sv

module hello();

import "DPI-C" context pass_string_c= task pass_string_sv(input string a);

import "DPI-C" context string_c2v_c= function string string_c2v_sv();

string some_string;

// This doesnt work in IUS583, will work in IUS6.0

export "DPI-C" print_string_c = function print_string_sv;

function void print_string_sv(input string aaa);

$display("Exported Verilog String=
%s", aaa);

endfunction

initial

begin

some_string = "pass it ON";

// enable when running IUS6.0

pass_string_sv(some_string);
// pass string to C

$display("Verilog: %s \n", string_c2v_sv() );
// get string from C

$finish;

end

endmodule

//hello.c

#include <stdio.h>

#include <svdpi.h>

// to use io_printf (prints to ncsim.log)

#include <veriuser.h>

void pass_string_c(const char* a) {

io_printf("DPI: %s\n", a);

// now call exported function

print_string_c("string passed from C");
// This wont work in IUS583

}

const char* string_c2v_c(void) {

io_printf("C: give up a string\n");

return "Gimme String";

}

//cmd

ncvlog -sv hello.sv

ncelab -access +RWC hello

gcc -m32 -fPIC -shared -o libdpi.so hello.c -I /tools/ius-9.20.016/tools/inca/include

ncsim -messages hello

我还没来得及看-m32选项的作用，希望大家能够顺利cosim