/* *	$OpenBSD: md.c,v 1.6 2007/11/28 12:04:25 miod Exp $*/
/*
 * 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.
 *
 */

#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.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(struct relocation_info_m88k *rp, unsigned char *addr)
{
	return rp->r_addend;
}

/*
 * Put RELOCATION at ADDR according to relocation record RP.
 */
void
md_relocate(struct relocation_info_m88k	*rp, long relocation,
	    unsigned char *addr, int relocatable_output)
{
	if (relocatable_output) {
		/*
		 * Store relocation where the next link-edit run
		 * will look for it.
		 */
		rp->r_addend = relocation;
		return;
	}

	switch ((rp->r_type)) {
	case RELOC_LO16:
		put_short(addr,relocation & 0xffff);
		break;
	case RELOC_HI16:
		put_short(addr,(relocation >>16) & 0xffff);
		break;
	case RELOC_PC16:
		put_short(addr,(relocation)>>2);
		break;
	case RELOC_PC26:
		put_b26(addr,(relocation)>>2);
		break;
	case RELOC_32:
		put_long(addr,relocation);
		break;
	case RELOC_IW16:
		printf ("oops\n"); exit(100);
		break;
	case NO_RELOC:
		break;
	case RELOC_GLOB_DAT:
		put_long(addr,relocation);
		break;
/*
	case RELOC_JMP_SLOT:
		md_make_jmpslot(addr,,
		break;
*/
	case RELOC_RELATIVE: 
	printf("reloc_rel not supported %x\n",addr);
	exit (15);
		break;

	default:
		errx(1, "Unsupported relocation size: %x",
		     (rp->r_type));
	}
#ifdef RTLD
	_cachectl (addr, RELOC_TARGET_SIZE(rp)); /* maintain cache coherency */
#endif
}

/*
 * Machine dependent part of claim_rrs_reloc().
 * Set RRS relocation type.
 */
int
md_make_reloc(struct relocation_info_m88k *rp, struct relocation_info_m88k *r,
	      int type)
{
	r->r_address = rp->r_address;
	r->r_type = rp->r_type;
	r->r_jmptable = rp->r_jmptable;
	r->r_pcrel = rp->r_pcrel;
	r->r_baserel = rp->r_baserel;
	r->r_extern = rp->r_extern;
	r->r_symbolnum = rp->r_symbolnum;
	r->r_addend = rp->r_addend;

	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(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
}

/*
 * 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(jmpslot_t *sp, long offset, u_long addr)
{
	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
}

/*
 * Update the relocation record for a RRS jmpslot.
 */
void
md_make_jmpreloc(struct relocation_info_m88k *rp,
		 struct relocation_info_m88k *r, int type)
{
	jmpslot_t	*sp;

	/*
	 * Fix relocation address to point to the correct
	 * location within this jmpslot.
	 */
	r->r_address += sizeof(sp->opcode);

#if 0
	/* Relocation size */
	r->r_length = 2;
#endif

	/* Set relocation type */
	r->r_jmptable = 1;
#if 0
	if (type & RELTYPE_RELATIVE)
		r->r_relative = 1;
#endif

printf("jmp reloc not supported \n");
exit (15);
}

/*
 * Set relocation type for a RRS GOT relocation.
 */
void
md_make_gotreloc(struct relocation_info_m88k *rp,
		 struct relocation_info_m88k *r, int type)
{
#if 0
	r->r_baserel = 1;
	if (type & RELTYPE_RELATIVE)
		r->r_relative = 1;

	/* Relocation size */
	r->r_length = 2;
#endif
printf("got not supported \n");
exit (15);
}

/*
 * Set relocation type for a RRS copy operation.
 */
void
md_make_cpyreloc(struct relocation_info_m88k *rp,
		 struct relocation_info_m88k *r)
{
	r->r_address = rp->r_address;
	r->r_type = rp->r_type;
	r->r_jmptable = rp->r_jmptable;
	r->r_pcrel = rp->r_pcrel;
	r->r_baserel = rp->r_baserel;
	r->r_extern = rp->r_extern;
	r->r_symbolnum = rp->r_symbolnum;
	r->r_addend = rp->r_addend;
}

void
md_set_breakpoint(long where, long *savep)
{
	*savep = *(long *)where;
	*(short *)where = BPT;
}

#ifndef MID_M88K
#define MID_M88K 153
#endif

#ifndef RTLD
/*
 * Initialize (output) exec header such that useful values are
 * obtained from subsequent N_*() macro evaluations.
 */
void
md_init_header(struct exec *hp, int magic, int flags)
{
	if (oldmagic)
		hp->a_midmag = oldmagic;
	else
		N_SETMAGIC((*hp), magic, MID_M88K, 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(struct exec *hp)
{
	int	mid = N_GETMID(*hp);

	if (mid == MID_M88K )
		return 1;
#if 0
	return (((md_swap_long(hp->a_midmag)&0x00ff0000) >> 16) == MID_SUN020);
#endif
	return 0;
}
#endif /* RTLD */


#ifdef NEED_SWAP
/*
 * Byte swap routines for cross-linking.
 */

void
md_swapin_exec_hdr(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(struct exec *h)
{
	int skip = 0;

#if 0
	if (N_GETMAGIC(*h) == OMAGIC)
		skip = 0;
#endif

	swap_longs((long *)h + skip, sizeof(*h)/sizeof(long) - skip);
}


void
md_swapin_reloc(struct relocation_info_m88k *r, int n)
{
	unsigned int bits;

	for (; n; n--, r++) {
		r->r_address = md_swap_long(r->r_address);
		bits = md_swap_long(((int *)r)[1]);
		r->r_symbolnum = (bits >> 8) & 0x00ffffff;
		r->r_extern = (bits >> 7) & 1;
		r->r_baserel = (bits >> 6) & 1;
		r->r_pcrel = (bits >> 5) & 1;
		r->r_jmptable = (bits >> 4) & 1;
		r->r_type = (bits >> 0) & 0x0f;
		r->r_addend = md_swap_long(r->r_addend);
	}
}

void
md_swapout_reloc(struct relocation_info_m88k *r, int n)
{
	unsigned int bits;

	for (; n; n--, r++) {
		r->r_address = md_swap_long(r->r_address);
		bits = (r->r_symbolnum & 0x00ffffff) << 8;
		bits |= (r->r_extern & 1) << 7;
		bits |= (r->r_baserel & 1) << 6;
		bits |= (r->r_pcrel & 1) << 5;
		bits |= (r->r_jmptable & 1) << 4;
		bits |= (r->r_type & 0x0f) << 0;
		((int *)r)[1] = md_swap_long(bits);
		r->r_addend = md_swap_long(r->r_addend);
	}
}

void
md_swapout_jmpslot(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);
	}
}

#else /* ! defined(NEEDSWAP) */
void
md_in_reloc(struct relocation_info_m88k *r, int n)
{
	for (; n; n--, r++) {

		switch(r->r_type){
		case RELOC_LO16:
		case RELOC_HI16:
/*			r->r_baserel =1; */
			break;
		case RELOC_PC16:
		case RELOC_PC26:
			r->r_pcrel =1;
/*			r->r_baserel =1; */
			break;
		case RELOC_32:
	/*		r->r_jmptable =1; */
			break;
		case RELOC_IW16:
			break;
		case RELOC_GLOB_DAT:
			break;
#if 1
		case RELOC_JMP_SLOT:
	/*		r->r_jmptable =1; */
			break;
#endif
		case RELOC_RELATIVE: 
			r->r_pcrel =1;
			break;
		default:
			printf("error in relocation type %x\n",r->r_type);
		print_reloc(r);
			exit(10);
		}
/*
		print_reloc(r);
*/
	}
}
#endif /* ! NEED_SWAP */
print_reloc(struct relocation_info_m88k *r)
{
	printf ("%6x:\t%4d\t%d\t%d\t%d\t%d\t%x\t",
		r->r_address,
		r->r_symbolnum,
		r->r_pcrel,
		r->r_extern,
		r->r_baserel,
		r->r_jmptable,
		r->r_addend
	);
	switch (r->r_type) {
	case RELOC_LO16:
		printf("lo16\n");
		break;
	case RELOC_HI16:
		printf("hi16\n");
		break;
	case RELOC_PC16:
		printf("pc16\n");
		break;
	case RELOC_PC26:
		printf("pc26\n");
		break;
	case RELOC_32:
		printf("reloc32\n");
		break;
	case RELOC_IW16:
		printf("iw16\n");
		break;
	case NO_RELOC:
		printf("none\n");
		break;
	case RELOC_GLOB_DAT:
		printf("glob_dat\n");
		break;
	case RELOC_JMP_SLOT:
		printf("jmp_slot\n");
		break;
	case RELOC_RELATIVE: 
		printf("rel\n");
		break;
	}

}