414 lines
9.0 KiB
C
414 lines
9.0 KiB
C
/* $NetBSD: md.c,v 1.15 1999/06/28 17:28:56 ragge Exp $ */
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/*-
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* Copyright (c) 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Paul Kranenburg.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <err.h>
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#include <fcntl.h>
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#include <a.out.h>
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#include <stab.h>
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#include <string.h>
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#include "ld.h"
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#ifndef RTLD
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/* Pull in the ld(1) bits as well */
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#include "ld_i.h"
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#endif
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/*
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* Get relocation addend corresponding to relocation record RP
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* from address ADDR
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*/
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long
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md_get_addend(rp, addr)
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struct relocation_info *rp;
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unsigned char *addr;
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{
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switch (RELOC_TARGET_SIZE(rp)) {
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case 0:
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return get_byte(addr);
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case 1:
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return get_short(addr);
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case 2:
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if (rp->r_baserel) {
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long addend = get_long(addr);
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if (rp->r_pcrel) {
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addend += rp->r_address + 4;
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if (addend)
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put_long(addr, -(rp->r_address+4));
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}
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return addend;
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}
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return get_long(addr);
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default:
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errx(1, "Unsupported relocation size: %x",
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RELOC_TARGET_SIZE(rp));
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}
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}
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/*
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* Put RELOCATION at ADDR according to relocation record RP.
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*/
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void
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md_relocate(rp, relocation, addr, relocatable_output)
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struct relocation_info *rp;
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long relocation;
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unsigned char *addr;
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int relocatable_output;
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{
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switch (RELOC_TARGET_SIZE(rp)) {
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case 0:
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put_byte(addr, relocation);
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break;
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case 1:
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put_short(addr, relocation);
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break;
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case 2:
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#ifndef RTLD
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if (rp->r_baserel) {
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relocation += got_symbol->value + get_long(addr);
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if (rp->r_copy)
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put_byte(addr-1, 0x10 | get_byte(addr-1));
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}
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#endif
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put_long(addr, relocation);
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break;
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default:
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errx(1, "Unsupported relocation size: %x",
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RELOC_TARGET_SIZE(rp));
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}
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}
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/*
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* Set up a "direct" transfer (ie. not through the run-time binder) from
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* jmpslot at OFFSET to ADDR. Used by `ld' when the SYMBOLIC flag is on,
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* and by `ld.so' after resolving the symbol.
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* On the VAX, we use a PC relative JMP instruction, so no
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* further RRS relocations will be necessary for such a jmpslot.
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*/
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void
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md_fix_jmpslot(sp, offset, addr, first)
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jmpslot_t *sp;
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long offset;
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u_long addr;
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int first;
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{
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u_long fudge = addr - (offset + 9);
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if (first) {
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sp->mask = 0x0101; /* NOP NOP */
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sp->insn[0] = 0x01; /* nop */
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sp->insn[1] = 0x17; /* jmp */
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} else {
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#ifdef RTLD
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sp->mask = *(u_int16_t *) addr;
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sp->insn[0] = 0x01; /* nop */
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sp->insn[1] = 0x17; /* jmp */
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fudge += 2; /* skip entry mask */
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#else
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sp->mask = 0x0000;
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sp->insn[0] = 0xfa; /* callg */
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sp->insn[1] = 0x6c; /* (ap) */
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#endif
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}
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sp->insn[2] = 0xef; /* L^(pc) */
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sp->insn[3] = (fudge >> 0) & 0xff;
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sp->insn[4] = (fudge >> 8) & 0xff;
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sp->insn[5] = (fudge >> 16) & 0xff;
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sp->insn[6] = (fudge >> 24) & 0xff;
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sp->insn[7] = 0x04; /* ret */
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}
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void
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md_set_breakpoint(where, savep)
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long where;
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long *savep;
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{
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*savep = *(long *)where;
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*(char *)where = BPT;
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}
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#ifndef RTLD
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/*
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* Machine dependent part of claim_rrs_reloc().
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* Set RRS relocation type.
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*/
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int
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md_make_reloc(rp, r, type)
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struct relocation_info *rp, *r;
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int type;
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{
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/* Relocation size */
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r->r_length = rp->r_length;
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if (RELOC_PCREL_P(rp))
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r->r_pcrel = 1;
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if (type & RELTYPE_RELATIVE)
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r->r_relative = 1;
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if (type & RELTYPE_COPY)
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r->r_copy = 1;
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return 0;
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}
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/*
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* Set up a transfer from jmpslot at OFFSET (relative to the PLT table)
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* to the binder slot (which is at offset 0 of the PLT).
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*/
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void
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md_make_jmpslot(sp, offset, index)
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jmpslot_t *sp;
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long offset;
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long index;
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{
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/*
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* On VAX a branch offset given in immediate mode is relative to
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* the end of the address itself.
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*/
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u_long fudge = - (offset + 9);
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sp->mask = (1 << 6); /* Just R6 (for setjmp) */
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sp->insn[0] = 0x01; /* nop */
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sp->insn[1] = 0x16; /* jsb */
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sp->insn[2] = 0xef; /* L^(pc) */
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sp->insn[3] = (fudge >> 0) & 0xff;
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sp->insn[4] = (fudge >> 8) & 0xff;
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sp->insn[5] = (fudge >> 16) & 0xff;
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sp->insn[6] = (fudge >> 24) & 0xff;
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sp->insn[7] = 0x00; /* halt */
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sp->reloc_index = index;
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}
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/*
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* Update the relocation record for a RRS jmpslot.
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*/
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void
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md_make_jmpreloc(rp, r, type)
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struct relocation_info *rp, *r;
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int type;
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{
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jmpslot_t *sp;
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/*
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* Fix relocation address to point to the correct
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* location within this jmpslot.
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*/
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r->r_address += sizeof(sp->mask);
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/* Relocation size */
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r->r_length = 2; /* 4 bytes */
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/* Set relocation type */
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r->r_jmptable = 1;
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if (type & RELTYPE_RELATIVE)
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r->r_relative = 1;
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}
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/*
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* Set relocation type for a RRS GOT relocation.
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*/
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void
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md_make_gotreloc(rp, r, type)
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struct relocation_info *rp, *r;
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int type;
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{
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r->r_baserel = 1;
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if (type & RELTYPE_RELATIVE)
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r->r_relative = 1;
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/* Relocation size */
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r->r_length = 2; /* 4 bytes */
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}
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/*
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* Set relocation type for a RRS copy operation.
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*/
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void
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md_make_cpyreloc(rp, r)
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struct relocation_info *rp, *r;
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{
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/* Relocation size */
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r->r_length = 2; /* 4 bytes */
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r->r_copy = 1;
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}
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int
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md_convert_textreloc(r)
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struct relocation_info *r;
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{
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if (r->r_length != 2 || !r->r_pcrel || !r->r_copy)
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return 0;
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r->r_baserel = 1;
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return 1;
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}
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#ifdef __FreeBSD__
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int netzmagic;
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#endif
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/*
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* Initialize (output) exec header such that useful values are
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* obtained from subsequent N_*() macro evaluations.
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*/
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void
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md_init_header(hp, magic, flags)
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struct exec *hp;
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int magic, flags;
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{
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#ifdef __NetBSD__
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if (oldmagic || magic == QMAGIC)
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hp->a_midmag = magic;
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else
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N_SETMAGIC((*hp), magic, MID_VAX, flags);
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#endif
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#ifdef __FreeBSD__
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if (oldmagic)
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hp->a_midmag = magic;
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else if (netzmagic)
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N_SETMAGIC_NET((*hp), magic, MID_VAX, flags);
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else
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N_SETMAGIC((*hp), magic, MID_VAX, flags);
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#endif
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/* TEXT_START depends on the value of outheader.a_entry. */
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if (!(link_mode & SHAREABLE))
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hp->a_entry = PAGSIZ;
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}
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#endif /* RTLD */
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#ifdef NEED_SWAP
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/*
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* Byte swap routines for cross-linking.
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*/
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void
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md_swapin_exec_hdr(h)
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struct exec *h;
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{
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int skip = 0;
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if (!N_BADMAG(*h))
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skip = 1;
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swap_longs((long *)h + skip, sizeof(*h)/sizeof(long) - skip);
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}
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void
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md_swapout_exec_hdr(h)
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struct exec *h;
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{
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/* NetBSD: Always leave magic alone */
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int skip = 1;
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#if 0
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if (N_GETMAGIC(*h) == OMAGIC)
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skip = 0;
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#endif
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swap_longs((long *)h + skip, sizeof(*h)/sizeof(long) - skip);
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}
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void
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md_swapin_reloc(r, n)
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struct relocation_info *r;
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int n;
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{
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int bits;
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for (; n; n--, r++) {
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r->r_address = md_swap_long(r->r_address);
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bits = ((int *)r)[1];
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r->r_symbolnum = md_swap_long(bits) & 0x00ffffff;
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r->r_pcrel = (bits & 1);
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r->r_length = (bits >> 1) & 3;
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r->r_extern = (bits >> 3) & 1;
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r->r_baserel = (bits >> 4) & 1;
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r->r_jmptable = (bits >> 5) & 1;
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r->r_relative = (bits >> 6) & 1;
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#ifdef N_SIZE
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r->r_copy = (bits >> 7) & 1;
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#endif
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}
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}
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void
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md_swapout_reloc(r, n)
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struct relocation_info *r;
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int n;
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{
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int bits;
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for (; n; n--, r++) {
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r->r_address = md_swap_long(r->r_address);
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bits = md_swap_long(r->r_symbolnum) & 0xffffff00;
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bits |= (r->r_pcrel & 1);
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bits |= (r->r_length & 3) << 1;
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bits |= (r->r_extern & 1) << 3;
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bits |= (r->r_baserel & 1) << 4;
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bits |= (r->r_jmptable & 1) << 5;
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bits |= (r->r_relative & 1) << 6;
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#ifdef N_SIZE
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bits |= (r->r_copy & 1) << 7;
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#endif
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((int *)r)[1] = bits;
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}
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}
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void
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md_swapout_jmpslot(j, n)
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jmpslot_t *j;
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int n;
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{
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for (; n; n--, j++) {
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j->mask = md_swap_short(j->mask);
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j->reloc_index = md_swap_short(j->reloc_index);
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}
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}
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#endif /* NEED_SWAP */
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