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/* $OpenBSD: byte.c,v 1.5 2004/01/28 18:05:10 deraadt Exp $ */
/*
* Copyright (c) 1999
* Marc Espie. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*/
/*
* A set of routines to read object files and compensate for host
* endianness
*/
static int
byte_sex(int mid)
{
switch (mid) {
case MID_I386:
case MID_VAX:
case MID_ALPHA:
case MID_PMAX:
return LITTLE_ENDIAN;
case MID_M68K:
case MID_M68K4K:
case MID_M88K:
case MID_SUN010:
case MID_SUN020:
case MID_HP200:
case MID_HP300:
case MID_HPPA:
case MID_HPUX800:
case MID_HPUX:
case MID_SPARC:
case MID_MIPS:
case MID_SPARC64:
case MID_POWERPC:
return BIG_ENDIAN;
default:
/* we don't know what this is, so we don't want to process it */
return 0;
}
}
#define BAD_OBJECT(h) (N_BADMAG(h) || !byte_sex(N_GETMID(h)))
/* handles endianess swaps */
static void
swap_u32s(u_int32_t *h, size_t n)
{
size_t i;
for (i = 0; i < n; i++)
h[i] = swap32(h[i]);
}
static void
fix_header_order(struct exec *h)
{
if (byte_sex(N_GETMID(*h)) != BYTE_ORDER)
swap_u32s( ((u_int32_t *)(h))+1, sizeof *h/sizeof(u_int32_t) - 1);
}
static long
fix_long_order(long l, int mid)
{
if (byte_sex(mid) != BYTE_ORDER)
return swap32(l);
else
return l;
}
static void
swap_nlist(struct nlist *p)
{
p->n_un.n_strx = swap32(p->n_un.n_strx);
p->n_desc = swap16(p->n_desc);
p->n_value = swap32(p->n_value);
}
static void
fix_nlist_order(struct nlist *p, int mid)
{
if (byte_sex(mid) != BYTE_ORDER)
swap_nlist(p);
}
static void
fix_nlists_order(struct nlist *p, size_t n, int mid)
{
size_t i;
if (byte_sex(mid) != BYTE_ORDER)
for (i = 0; i < n; i++)
swap_nlist(p+i);
}
static void
fix_ranlib_order(struct ranlib *r, int mid)
{
if (byte_sex(mid) != BYTE_ORDER) {
r->ran_un.ran_strx = swap32(r->ran_un.ran_strx);
r->ran_off = swap32(r->ran_off);
}
}
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