NetBSD-5.0.2/libexec/ld.aout_so/arch/vax/md.c
/* $NetBSD: md.c,v 1.16 2008/04/28 20:23:03 martin 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.
*
* 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 <stddef.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:
if (rp->r_baserel) {
long addend = get_long(addr);
if (rp->r_pcrel) {
addend += rp->r_address + 4;
if (addend)
put_long(addr, -(rp->r_address+4));
}
return addend;
}
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:
#ifndef RTLD
if (rp->r_baserel) {
relocation += got_symbol->value + get_long(addr);
if (rp->r_copy)
put_byte(addr-1, 0x10 | get_byte(addr-1));
}
#endif
put_long(addr, relocation);
break;
default:
errx(1, "Unsupported relocation size: %x",
RELOC_TARGET_SIZE(rp));
}
}
/*
* 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 VAX, we use a PC relative JMP instruction, 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 - (offset + 9);
if (first) {
sp->mask = 0x0101; /* NOP NOP */
sp->insn[0] = 0x01; /* nop */
sp->insn[1] = 0x17; /* jmp */
} else {
#ifdef RTLD
sp->mask = *(u_int16_t *) addr;
sp->insn[0] = 0x01; /* nop */
sp->insn[1] = 0x17; /* jmp */
fudge += 2; /* skip entry mask */
#else
sp->mask = 0x0000;
sp->insn[0] = 0xfa; /* callg */
sp->insn[1] = 0x6c; /* (ap) */
#endif
}
sp->insn[2] = 0xef; /* L^(pc) */
sp->insn[3] = (fudge >> 0) & 0xff;
sp->insn[4] = (fudge >> 8) & 0xff;
sp->insn[5] = (fudge >> 16) & 0xff;
sp->insn[6] = (fudge >> 24) & 0xff;
sp->insn[7] = 0x04; /* ret */
}
void
md_set_breakpoint(where, savep)
long where;
long *savep;
{
*savep = *(long *)where;
*(char *)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 VAX a branch offset given in immediate mode is relative to
* the end of the address itself.
*/
u_long fudge = - (offset + 9);
sp->mask = (1 << 6); /* Just R6 (for setjmp) */
sp->insn[0] = 0x01; /* nop */
sp->insn[1] = 0x16; /* jsb */
sp->insn[2] = 0xef; /* L^(pc) */
sp->insn[3] = (fudge >> 0) & 0xff;
sp->insn[4] = (fudge >> 8) & 0xff;
sp->insn[5] = (fudge >> 16) & 0xff;
sp->insn[6] = (fudge >> 24) & 0xff;
sp->insn[7] = 0x00; /* halt */
sp->reloc_index = index;
}
/*
* 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->mask);
/* Relocation size */
r->r_length = 2; /* 4 bytes */
/* 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; /* 4 bytes */
}
/*
* 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; /* 4 bytes */
r->r_copy = 1;
}
int
md_convert_textreloc(r)
struct relocation_info *r;
{
if (r->r_length != 2 || !r->r_pcrel || !r->r_copy)
return 0;
r->r_baserel = 1;
return 1;
}
#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_VAX, flags);
#endif
#ifdef __FreeBSD__
if (oldmagic)
hp->a_midmag = magic;
else if (netzmagic)
N_SETMAGIC_NET((*hp), magic, MID_VAX, flags);
else
N_SETMAGIC((*hp), magic, MID_VAX, flags);
#endif
/* TEXT_START depends on the value of outheader.a_entry. */
if (!(link_mode & SHAREABLE))
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) & 0x00ffffff;
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 & 3) << 1;
bits |= (r->r_extern & 1) << 3;
bits |= (r->r_baserel & 1) << 4;
bits |= (r->r_jmptable & 1) << 5;
bits |= (r->r_relative & 1) << 6;
#ifdef N_SIZE
bits |= (r->r_copy & 1) << 7;
#endif
((int *)r)[1] = bits;
}
}
void
md_swapout_jmpslot(j, n)
jmpslot_t *j;
int n;
{
for (; n; n--, j++) {
j->mask = md_swap_short(j->mask);
j->reloc_index = md_swap_short(j->reloc_index);
}
}
#endif /* NEED_SWAP */