source: trunk/minix/lib/ack/libm2/load.c@ 10

/*
  (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
  See the copyright notice in the ACK home directory, in the file "Copyright".
*/

/*
  Module:       get value on stack, byte by byte
  Author:       Ceriel J.H. Jacobs
  Version:      $Header: /cvsup/minix/src/lib/ack/libm2/load.c,v 1.1 2005/10/10 15:27:46 beng Exp $
*/

#include <m2_traps.h>

#ifndef EM_WSIZE
#define EM_WSIZE _EM_WSIZE
#define EM_PSIZE _EM_PSIZE
#endif

#if EM_WSIZE==EM_PSIZE
typedef unsigned pcnt;
#else
typedef long pcnt;
#endif

load(siz, addr, p)
        register char *addr;
        register pcnt siz;
{
        /*      Make sure, that a value with a size that could have been
                handled by the LOI instruction ends up at the same place,
                where it would, were the LOI instruction used.
        */
        register char *q = (char *) &p;
        char t[4];

        if (siz < EM_WSIZE && EM_WSIZE % siz == 0) {
                /* as long as EM_WSIZE <= 4 ... */
                if (siz != 2) TRP(M2_INTERNAL); /* internal error */
                q = &t[0];
        }
        while (siz--) *q++ = *addr++;
        if (q - t == 2) {
                *((unsigned *)(&p)) = *((unsigned short *) (&t[0]));
        }
}