Linker Tasks

Using Linker commands

Note that the line CFLAGS =… causes any C files to be compiled in ANSI mode (-Aa) and causes the compiler to search for routines that are defined in the Posix standard (-D_POSIX_SOURCE).

For details on using make refer to make(1).

Source for dynprog. Here is the source file for the dynprog program.

dynprog.c — Example Dynamic Link and Load Program

#include <stdio.h> #include <nlist.h>

extern void * alloc_load_space(const char * base_prog, const char * obj_files, const char * dest_file);

extern void * dyn_load(const char * base_prog,

unsigned int

addr,

const char *

obj_files,

const

char

*

dest_file,

const

char

*

entry_pt);

const char * base_prog = “dynprog”;

/* this executable’s name

 

*/

 

 

 

 

const char * obj_files = “file1.o file2.o”; /* .o files to combine

 

*/

 

 

 

 

const char * dest_file = “dynobj.o”;

/* .o file to load

 

*/

 

 

 

 

const char * entry_pt

= “foo”;

/* define entry pt name

 

*/

 

 

 

 

void glorp (const char *); /* prototype for local

 

function

*/

 

 

 

void (* foo_ptr) ();

/* pointer to entry point foo

 

*/

 

 

 

 

void (* bar_ptr) ();

/* pointer to function bar

 

*/

 

 

 

 

int * counter_ptr;

 

/* pointer to variable counter [file2.c]

*/

 

 

 

 

main()

 

 

 

 

{

 

 

 

 

unsigned int addr;

/* address at which to load dynobj.o

*/

struct nlist nl[3];

/* nlist struct to retrieve addresse

*/

/*

STEP 1: Allocate space for module: */

addr = (unsigned int) alloc_load_space(base_prog, obj_files, dest_file);

/*

STEP 2: Load the file at the address, and get address of entry point:

*/

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Chapter 3

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Kenwood HP 9000 manual Dynprog.c Example Dynamic Link and Load Program

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