NetBSD/libexec/ld.aout_so/arch/m68k/md.c

385 lines
8.2 KiB
C

/* $NetBSD: md.c,v 1.16 1999/04/12 00:52:44 gwr Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* 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 the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
#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"
#ifndef RTLD
/* Pull in the ld(1) bits as well */
#include "ld_i.h"
#endif
/*
* 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);
default:
errx(1, "Unsupported relocation size: %x",
RELOC_TARGET_SIZE(rp));
}
}
/*
* 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);
break;
case 1:
put_short(addr, relocation);
break;
case 2:
put_long(addr, relocation);
break;
default:
errx(1, "Unsupported relocation size: %x",
RELOC_TARGET_SIZE(rp));
}
#ifdef RTLD
_cachectl (addr, RELOC_TARGET_SIZE(rp)); /* maintain cache coherency */
#endif
}
/*
* 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 m68k, we use the BRA instruction which is PC relative, so no
* further RRS relocations will be necessary for such a jmpslot.
*/
void
md_fix_jmpslot(sp, offset, addr, first)
jmpslot_t *sp;
long offset;
u_long addr;
int first;
{
u_long fudge = addr - (sizeof(sp->opcode) + offset);
sp->opcode = BRAL;
sp->addr[0] = fudge >> 16;
sp->addr[1] = fudge;
sp->reloc_index = 0;
#ifdef RTLD
_cachectl (sp, 6); /* maintain cache coherency */
#endif
}
void
md_set_breakpoint(where, savep)
long where;
long *savep;
{
*savep = *(long *)where;
*(short *)where = BPT;
}
#ifndef RTLD
/*
* 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;
{
/*
* On m68k machines, a long branch offset is relative to
* the address of the offset.
*/
u_long fudge = - (sizeof(sp->opcode) + offset);
sp->opcode = BSRL;
sp->addr[0] = fudge >> 16;
sp->addr[1] = fudge;
sp->reloc_index = index;
#ifdef RTLD
_cachectl (sp, 6); /* maintain cache coherency */
#endif
}
/*
* 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;
}
/*
* 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;
{
if (oldmagic)
hp->a_midmag = oldmagic;
else
N_SETMAGIC((*hp), magic, MID_MACHINE, flags);
/* TEXT_START depends on the value of outheader.a_entry. */
if (!(link_mode & SHAREABLE))
hp->a_entry = PAGSIZ;
}
/*
* Check for acceptable foreign machine Ids
*/
int
md_midcompat(hp)
struct exec *hp;
{
int mid = N_GETMID(*hp);
if (mid == MID_M68K ||
mid == MID_M68K4K ||
mid == MID_HP300 ||
mid == MID_HPUX ||
mid == MID_HPUX800)
return 1;
#ifdef MID_SUN020
mid = (md_swap_long(hp->a_midmag) & 0x00ff0000) >> 16;
if (mid == MID_SUN020)
return 1;
#endif
return 0;
}
#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) >> 8;
bits >>= 24;
r->r_pcrel = (bits >> 7) & 1;
r->r_length = (bits >> 5) & 3;
r->r_extern = (bits >> 4) & 1;
r->r_baserel = (bits >> 3) & 1;
r->r_jmptable = (bits >> 2) & 1;
r->r_relative = (bits >> 1) & 1;
#ifdef N_SIZE
r->r_copy = (bits & 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 = (r->r_pcrel & 1) << 7;
bits |= (r->r_length & 3) << 5;
bits |= (r->r_extern & 1) << 4;
bits |= (r->r_baserel & 1) << 3;
bits |= (r->r_jmptable & 1) << 2;
bits |= (r->r_relative & 1) << 1;
#ifdef N_SIZE
bits |= (r->r_copy & 1);
#endif
((int *)r)[1] = md_swap_long(r->r_symbolnum) >> 8;
((unsigned char *)r)[7] = 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 */