xref: /freebsd-11-stable/sys/sparc64/sparc64/elf_machdep.c

/*-
 * Copyright (c) 2001 Jake Burkholder.
 * Copyright (c) 2000 Eduardo Horvath.
 * Copyright (c) 1999 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.
 *
 *	from: NetBSD: mdreloc.c,v 1.5 2001/04/25 12:24:51 kleink Exp
 * $FreeBSD: head/sys/sparc64/sparc64/elf_machdep.c 100384 2002-07-20 02:56:12Z peter $
 */

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/linker.h>
#include <sys/sysent.h>
#include <sys/imgact_elf.h>
#include <sys/syscall.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <machine/elf.h>
#include <machine/md_var.h>

#include "linker_if.h"

struct sysentvec elf64_freebsd_sysvec = {
	SYS_MAXSYSCALL,
	sysent,
	0,
	0,
	0,
	0,
	0,
	0,
	elf64_freebsd_fixup,
	sendsig,
	sigcode,
	&szsigcode,
	0,
	"FreeBSD ELF64",
	__elfN(coredump),
	NULL,
	MINSIGSTKSZ
};

static Elf64_Brandinfo freebsd_brand_info = {
						ELFOSABI_FREEBSD,
						EM_SPARCV9,
						"FreeBSD",
						"",
						"/usr/libexec/ld-elf.so.1",
						&elf64_freebsd_sysvec
					  };

SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
	(sysinit_cfunc_t) elf64_insert_brand_entry,
	&freebsd_brand_info);

/*
 * The following table holds for each relocation type:
 *	- the width in bits of the memory location the relocation
 *	  applies to (not currently used)
 *	- the number of bits the relocation value must be shifted to the
 *	  right (i.e. discard least significant bits) to fit into
 *	  the appropriate field in the instruction word.
 *	- flags indicating whether
 *		* the relocation involves a symbol
 *		* the relocation is relative to the current position
 *		* the relocation is for a GOT entry
 *		* the relocation is relative to the load address
 *
 */
#define _RF_S		0x80000000		/* Resolve symbol */
#define _RF_A		0x40000000		/* Use addend */
#define _RF_P		0x20000000		/* Location relative */
#define _RF_G		0x10000000		/* GOT offset */
#define _RF_B		0x08000000		/* Load address relative */
#define _RF_U		0x04000000		/* Unaligned */
#define _RF_SZ(s)	(((s) & 0xff) << 8)	/* memory target size */
#define _RF_RS(s)	( (s) & 0xff)		/* right shift */
static int reloc_target_flags[] = {
	0,							/* NONE */
	_RF_S|_RF_A|		_RF_SZ(8)  | _RF_RS(0),		/* RELOC_8 */
	_RF_S|_RF_A|		_RF_SZ(16) | _RF_RS(0),		/* RELOC_16 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* RELOC_32 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(8)  | _RF_RS(0),		/* DISP_8 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(16) | _RF_RS(0),		/* DISP_16 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(0),		/* DISP_32 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(2),		/* WDISP_30 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(2),		/* WDISP_22 */
	      _RF_A|	  _RF_B|_RF_SZ(32) | _RF_RS(10),	/* HI22 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 22 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 13 */
	      _RF_A|	  _RF_B|_RF_SZ(32) | _RF_RS(0),		/* LO10 */
	_RF_G|			_RF_SZ(32) | _RF_RS(0),		/* GOT10 */
	_RF_G|			_RF_SZ(32) | _RF_RS(0),		/* GOT13 */
	_RF_G|			_RF_SZ(32) | _RF_RS(10),	/* GOT22 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(0),		/* PC10 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(10),	/* PC22 */
	      _RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(2),		/* WPLT30 */
				_RF_SZ(32) | _RF_RS(0),		/* COPY */
	_RF_S|_RF_A|		_RF_SZ(64) | _RF_RS(0),		/* GLOB_DAT */
				_RF_SZ(32) | _RF_RS(0),		/* JMP_SLOT */
	      _RF_A|	  _RF_B|_RF_SZ(64) | _RF_RS(0),		/* RELATIVE */
	_RF_S|_RF_A|	  _RF_U|_RF_SZ(32) | _RF_RS(0),		/* UA_32 */

	      _RF_A|		_RF_SZ(32) | _RF_RS(0),		/* PLT32 */
	      _RF_A|		_RF_SZ(32) | _RF_RS(10),	/* HIPLT22 */
	      _RF_A|		_RF_SZ(32) | _RF_RS(0),		/* LOPLT10 */
	      _RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(0),		/* PCPLT32 */
	      _RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(10),	/* PCPLT22 */
	      _RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(0),		/* PCPLT10 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 10 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 11 */
	_RF_S|_RF_A|		_RF_SZ(64) | _RF_RS(0),		/* 64 */
	_RF_S|_RF_A|/*extra*/	_RF_SZ(32) | _RF_RS(0),		/* OLO10 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(42),	/* HH22 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(32),	/* HM10 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(10),	/* LM22 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(42),	/* PC_HH22 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(32),	/* PC_HM10 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(10),	/* PC_LM22 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(2),		/* WDISP16 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(2),		/* WDISP19 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* GLOB_JMP */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 7 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 5 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 6 */
	_RF_S|_RF_A|_RF_P|	_RF_SZ(64) | _RF_RS(0),		/* DISP64 */
	      _RF_A|		_RF_SZ(64) | _RF_RS(0),		/* PLT64 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(10),	/* HIX22 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* LOX10 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(22),	/* H44 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(12),	/* M44 */
	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* L44 */
	_RF_S|_RF_A|		_RF_SZ(64) | _RF_RS(0),		/* REGISTER */
	_RF_S|_RF_A|	_RF_U|	_RF_SZ(64) | _RF_RS(0),		/* UA64 */
	_RF_S|_RF_A|	_RF_U|	_RF_SZ(16) | _RF_RS(0),		/* UA16 */
};

#define RELOC_RESOLVE_SYMBOL(t)		((reloc_target_flags[t] & _RF_S) != 0)
#define RELOC_PC_RELATIVE(t)		((reloc_target_flags[t] & _RF_P) != 0)
#define RELOC_BASE_RELATIVE(t)		((reloc_target_flags[t] & _RF_B) != 0)
#define RELOC_UNALIGNED(t)		((reloc_target_flags[t] & _RF_U) != 0)
#define RELOC_USE_ADDEND(t)		((reloc_target_flags[t] & _RF_A) != 0)
#define RELOC_TARGET_SIZE(t)		((reloc_target_flags[t] >> 8) & 0xff)
#define RELOC_VALUE_RIGHTSHIFT(t)	(reloc_target_flags[t] & 0xff)

static long reloc_target_bitmask[] = {
#define _BM(x)	(~(-(1ULL << (x))))
	0,				/* NONE */
	_BM(8), _BM(16), _BM(32),	/* RELOC_8, _16, _32 */
	_BM(8), _BM(16), _BM(32),	/* DISP8, DISP16, DISP32 */
	_BM(30), _BM(22),		/* WDISP30, WDISP22 */
	_BM(22), _BM(22),		/* HI22, _22 */
	_BM(13), _BM(10),		/* RELOC_13, _LO10 */
	_BM(10), _BM(13), _BM(22),	/* GOT10, GOT13, GOT22 */
	_BM(10), _BM(22),		/* _PC10, _PC22 */
	_BM(30), 0,			/* _WPLT30, _COPY */
	_BM(32), _BM(32), _BM(32),	/* _GLOB_DAT, JMP_SLOT, _RELATIVE */
	_BM(32), _BM(32),		/* _UA32, PLT32 */
	_BM(22), _BM(10),		/* _HIPLT22, LOPLT10 */
	_BM(32), _BM(22), _BM(10),	/* _PCPLT32, _PCPLT22, _PCPLT10 */
	_BM(10), _BM(11), -1,		/* _10, _11, _64 */
	_BM(10), _BM(22),		/* _OLO10, _HH22 */
	_BM(10), _BM(22),		/* _HM10, _LM22 */
	_BM(22), _BM(10), _BM(22),	/* _PC_HH22, _PC_HM10, _PC_LM22 */
	_BM(16), _BM(19),		/* _WDISP16, _WDISP19 */
	-1,				/* GLOB_JMP */
	_BM(7), _BM(5), _BM(6)		/* _7, _5, _6 */
	-1, -1,				/* DISP64, PLT64 */
	_BM(22), _BM(13),		/* HIX22, LOX10 */
	_BM(22), _BM(10), _BM(13),	/* H44, M44, L44 */
	-1, -1, _BM(16),		/* REGISTER, UA64, UA16 */
#undef _BM
};
#define RELOC_VALUE_BITMASK(t)	(reloc_target_bitmask[t])

/* Process one elf relocation with addend. */
int
elf_reloc(linker_file_t lf, const void *data, int type)
{
	const Elf_Rela *rela;
	Elf_Addr relocbase;
	Elf_Half *where32;
	Elf_Addr *where;
	Elf_Word rtype, symidx;
	Elf_Addr value;
	Elf_Addr mask;
	Elf_Addr addr;

	if (type != ELF_RELOC_RELA)
		return (-1);

	relocbase = (Elf_Addr)lf->address;
	rela = (const Elf_Rela *)data;
	where = (Elf_Addr *)(relocbase + rela->r_offset);
	where32 = (Elf_Half *)where;
	rtype = ELF_R_TYPE(rela->r_info);
	symidx = ELF_R_SYM(rela->r_info);

	if (rtype == R_SPARC_NONE)
		return (0);

	if (rtype == R_SPARC_JMP_SLOT || rtype == R_SPARC_COPY ||
	    rtype > R_SPARC_UA16)
		return (-1);

	if (RELOC_UNALIGNED(rtype))
		return (-1);

	value = rela->r_addend;

	if (RELOC_RESOLVE_SYMBOL(rtype)) {
		addr = elf_lookup(lf, symidx, 1);
		if (addr == 0)
			return (-1);
		value += addr;
	}

	if (RELOC_PC_RELATIVE(rtype))
		value -= (Elf_Addr)where;

	if (RELOC_BASE_RELATIVE(rtype))
		value += relocbase;

	mask = RELOC_VALUE_BITMASK(rtype);
	value >>= RELOC_VALUE_RIGHTSHIFT(rtype);
	value &= mask;

	if (RELOC_TARGET_SIZE(rtype) > 32) {
		*where &= ~mask;
		*where |= value;
	} else {
		*where32 &= ~mask;
		*where32 |= value;
	}

	return (0);
}