699e1b82fb
handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
358 lines
7.6 KiB
C
358 lines
7.6 KiB
C
/*
|
|
* Copyright (c) 1993 Paul Kranenburg
|
|
* 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.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Paul Kranenburg.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $Id: md.c,v 1.9 1994/02/13 20:42:09 jkh Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <a.out.h>
|
|
#include <stab.h>
|
|
#include <string.h>
|
|
|
|
#include "ld.h"
|
|
|
|
/*
|
|
* Get relocation addend corresponding to relocation record RP
|
|
* from address ADDR
|
|
*/
|
|
long
|
|
md_get_addend(rp, addr)
|
|
struct relocation_info *rp;
|
|
unsigned char *addr;
|
|
{
|
|
switch (RELOC_TARGET_SIZE(rp)) {
|
|
case 0:
|
|
return get_byte(addr);
|
|
case 1:
|
|
return get_short(addr);
|
|
case 2:
|
|
return get_long(addr);
|
|
}
|
|
errx(1, "Unsupported relocation size: %x", RELOC_TARGET_SIZE(rp));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Put RELOCATION at ADDR according to relocation record RP.
|
|
*/
|
|
void
|
|
md_relocate(rp, relocation, addr, relocatable_output)
|
|
struct relocation_info *rp;
|
|
long relocation;
|
|
unsigned char *addr;
|
|
int relocatable_output;
|
|
{
|
|
switch (RELOC_TARGET_SIZE(rp)) {
|
|
case 0:
|
|
put_byte(addr, relocation);
|
|
return;
|
|
case 1:
|
|
put_short(addr, relocation);
|
|
return;
|
|
case 2:
|
|
put_long(addr, relocation);
|
|
return;
|
|
}
|
|
errx(1, "Unsupported relocation size: %x", RELOC_TARGET_SIZE(rp));
|
|
}
|
|
|
|
/*
|
|
* Machine dependent part of claim_rrs_reloc().
|
|
* Set RRS relocation type.
|
|
*/
|
|
int
|
|
md_make_reloc(rp, r, type)
|
|
struct relocation_info *rp, *r;
|
|
int type;
|
|
{
|
|
/* Relocation size */
|
|
r->r_length = rp->r_length;
|
|
|
|
if (RELOC_PCREL_P(rp))
|
|
r->r_pcrel = 1;
|
|
|
|
if (type & RELTYPE_RELATIVE)
|
|
r->r_relative = 1;
|
|
|
|
if (type & RELTYPE_COPY)
|
|
r->r_copy = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set up a transfer from jmpslot at OFFSET (relative to the PLT table)
|
|
* to the binder slot (which is at offset 0 of the PLT).
|
|
*/
|
|
void
|
|
md_make_jmpslot(sp, offset, index)
|
|
jmpslot_t *sp;
|
|
long offset;
|
|
long index;
|
|
{
|
|
/*
|
|
* i386 PC-relative "fixed point" is located right after the
|
|
* instruction it pertains to.
|
|
*/
|
|
u_long fudge = - (sizeof(sp->opcode) + sizeof(sp->addr) + offset);
|
|
|
|
sp->opcode = CALL;
|
|
#if 0
|
|
sp->addr = fudge;
|
|
#else
|
|
sp->addr[0] = fudge & 0xffff;
|
|
sp->addr[1] = fudge >> 16;
|
|
#endif
|
|
sp->reloc_index = index;
|
|
}
|
|
|
|
/*
|
|
* Set up a "direct" transfer (ie. not through the run-time binder) from
|
|
* jmpslot at OFFSET to ADDR. Used by `ld' when the SYMBOLIC flag is on,
|
|
* and by `ld.so' after resolving the symbol.
|
|
* On the i386, we use the JMP instruction which is PC relative, so no
|
|
* further RRS relocations will be necessary for such a jmpslot.
|
|
*/
|
|
void
|
|
md_fix_jmpslot(sp, offset, addr)
|
|
jmpslot_t *sp;
|
|
long offset;
|
|
u_long addr;
|
|
{
|
|
u_long fudge = addr - (sizeof(sp->opcode) + sizeof(sp->addr) + offset);
|
|
|
|
sp->opcode = JUMP;
|
|
#if 0
|
|
sp->addr = fudge;
|
|
#else
|
|
sp->addr[0] = fudge & 0xffff;
|
|
sp->addr[1] = fudge >> 16;
|
|
#endif
|
|
sp->reloc_index = 0;
|
|
}
|
|
|
|
/*
|
|
* Update the relocation record for a RRS jmpslot.
|
|
*/
|
|
void
|
|
md_make_jmpreloc(rp, r, type)
|
|
struct relocation_info *rp, *r;
|
|
int type;
|
|
{
|
|
jmpslot_t *sp;
|
|
|
|
/*
|
|
* Fix relocation address to point to the correct
|
|
* location within this jmpslot.
|
|
*/
|
|
r->r_address += sizeof(sp->opcode);
|
|
|
|
/* Relocation size */
|
|
r->r_length = 2;
|
|
|
|
/* Set relocation type */
|
|
r->r_jmptable = 1;
|
|
if (type & RELTYPE_RELATIVE)
|
|
r->r_relative = 1;
|
|
|
|
}
|
|
|
|
/*
|
|
* Set relocation type for a RRS GOT relocation.
|
|
*/
|
|
void
|
|
md_make_gotreloc(rp, r, type)
|
|
struct relocation_info *rp, *r;
|
|
int type;
|
|
{
|
|
r->r_baserel = 1;
|
|
if (type & RELTYPE_RELATIVE)
|
|
r->r_relative = 1;
|
|
|
|
/* Relocation size */
|
|
r->r_length = 2;
|
|
}
|
|
|
|
/*
|
|
* Set relocation type for a RRS copy operation.
|
|
*/
|
|
void
|
|
md_make_cpyreloc(rp, r)
|
|
struct relocation_info *rp, *r;
|
|
{
|
|
/* Relocation size */
|
|
r->r_length = 2;
|
|
|
|
r->r_copy = 1;
|
|
}
|
|
|
|
void
|
|
md_set_breakpoint(where, savep)
|
|
long where;
|
|
long *savep;
|
|
{
|
|
*savep = *(long *)where;
|
|
*(char *)where = TRAP;
|
|
}
|
|
|
|
#ifndef RTLD
|
|
|
|
#ifdef FreeBSD
|
|
int netzmagic;
|
|
#endif
|
|
|
|
/*
|
|
* Initialize (output) exec header such that useful values are
|
|
* obtained from subsequent N_*() macro evaluations.
|
|
*/
|
|
void
|
|
md_init_header(hp, magic, flags)
|
|
struct exec *hp;
|
|
int magic, flags;
|
|
{
|
|
#ifdef NetBSD
|
|
if (oldmagic || magic == QMAGIC)
|
|
hp->a_midmag = magic;
|
|
else
|
|
N_SETMAGIC((*hp), magic, MID_I386, flags);
|
|
#endif
|
|
#ifdef FreeBSD
|
|
if (oldmagic)
|
|
hp->a_midmag = magic;
|
|
else if (netzmagic)
|
|
N_SETMAGIC_NET((*hp), magic, MID_I386, flags);
|
|
else
|
|
N_SETMAGIC((*hp), magic, MID_I386, flags);
|
|
#endif
|
|
|
|
/* TEXT_START depends on the value of outheader.a_entry. */
|
|
if (!(link_mode & SHAREABLE)) /*WAS: if (entry_symbol) */
|
|
hp->a_entry = PAGSIZ;
|
|
}
|
|
#endif /* RTLD */
|
|
|
|
|
|
#ifdef NEED_SWAP
|
|
/*
|
|
* Byte swap routines for cross-linking.
|
|
*/
|
|
|
|
void
|
|
md_swapin_exec_hdr(h)
|
|
struct exec *h;
|
|
{
|
|
int skip = 0;
|
|
|
|
if (!N_BADMAG(*h))
|
|
skip = 1;
|
|
|
|
swap_longs((long *)h + skip, sizeof(*h)/sizeof(long) - skip);
|
|
}
|
|
|
|
void
|
|
md_swapout_exec_hdr(h)
|
|
struct exec *h;
|
|
{
|
|
/* NetBSD: Always leave magic alone */
|
|
int skip = 1;
|
|
#if 0
|
|
if (N_GETMAGIC(*h) == OMAGIC)
|
|
skip = 0;
|
|
#endif
|
|
|
|
swap_longs((long *)h + skip, sizeof(*h)/sizeof(long) - skip);
|
|
}
|
|
|
|
|
|
void
|
|
md_swapin_reloc(r, n)
|
|
struct relocation_info *r;
|
|
int n;
|
|
{
|
|
int bits;
|
|
|
|
for (; n; n--, r++) {
|
|
r->r_address = md_swap_long(r->r_address);
|
|
bits = ((int *)r)[1];
|
|
r->r_symbolnum = md_swap_long(bits & 0xffffff00);
|
|
r->r_pcrel = (bits & 1);
|
|
r->r_length = ((bits >> 1) & 3);
|
|
r->r_extern = ((bits >> 3) & 1);
|
|
r->r_baserel = ((bits >> 4) & 1);
|
|
r->r_jmptable = ((bits >> 5) & 1);
|
|
r->r_relative = ((bits >> 6) & 1);
|
|
#ifdef N_SIZE
|
|
r->r_copy = ((bits >> 7) & 1);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void
|
|
md_swapout_reloc(r, n)
|
|
struct relocation_info *r;
|
|
int n;
|
|
{
|
|
int bits;
|
|
|
|
for (; n; n--, r++) {
|
|
r->r_address = md_swap_long(r->r_address);
|
|
bits = (md_swap_long(r->r_symbolnum) & 0xffffff00);
|
|
bits |= (r->r_pcrel & 1);
|
|
bits |= ((r->r_length << 1) & 6);
|
|
bits |= ((r->r_extern << 3) & 8);
|
|
bits |= ((r->r_baserel << 4) & 0x10);
|
|
bits |= ((r->r_jmptable << 5) & 0x20);
|
|
bits |= ((r->r_relative << 6) & 0x40);
|
|
#ifdef N_SIZE
|
|
bits |= ((r->r_copy << 7) & 0x80);
|
|
#endif
|
|
((int *)r)[1] = bits;
|
|
}
|
|
}
|
|
|
|
void
|
|
md_swapout_jmpslot(j, n)
|
|
jmpslot_t *j;
|
|
int n;
|
|
{
|
|
for (; n; n--, j++) {
|
|
j->opcode = md_swap_short(j->opcode);
|
|
j->addr[0] = md_swap_short(j->addr[0]);
|
|
j->addr[1] = md_swap_short(j->addr[1]);
|
|
j->reloc_index = md_swap_short(j->reloc_index);
|
|
}
|
|
}
|
|
|
|
#endif /* NEED_SWAP */
|