[dragonfly.git] / sys / boot / common / reloc_elf.c

/*-
 * Copyright (c) 2003 Jake Burkholder.
 * Copyright 1996-1998 John D. Polstra.
 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
 * Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: src/sys/boot/common/reloc_elf.c,v 1.2 2005/12/18 04:52:35 marcel Exp $
 */

#include <sys/types.h>
#include <machine/elf.h>

#include <errno.h>
#include <stand.h>

#define FREEBSD_ELF
#include <link.h>

#include "bootstrap.h"

#define COPYOUT(s,d,l)	archsw.arch_copyout((vm_offset_t)(s), d, l)

/*
 * Apply a single intra-module relocation to the data. `relbase' is the
 * target relocation base for the section (i.e. it corresponds to where
 * r_offset == 0). `dataaddr' is the relocated address corresponding to
 * the start of the data, and `len' is the number of bytes.
 */
int
__elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr, const void *reldata,
    int reltype, Elf_Addr relbase, Elf_Addr dataaddr, void *data, size_t len)
{
#ifdef __sparc__
	Elf_Size w;
	const Elf_Rela *a;

	switch (reltype) {
	case ELF_RELOC_RELA:
		a = reldata;
		 if (relbase + a->r_offset >= dataaddr &&
		     relbase + a->r_offset < dataaddr + len) {
			switch (ELF_R_TYPE(a->r_info)) {
			case R_SPARC_RELATIVE:
				w = relbase + a->r_addend;
				bcopy(&w, (u_char *)data + (relbase +
				    a->r_offset - dataaddr), sizeof(w));
				break;
			default:
				printf("\nunhandled relocation type %u\n",
				    (u_int)ELF_R_TYPE(a->r_info));
				return (EFTYPE);
			}
		}
		break;
	}

	return (0);
#elif defined(__i386__) && __ELF_WORD_SIZE == 64
	Elf64_Addr *where, val;
	Elf_Addr addend, addr;
	Elf_Size rtype, symidx;
	const Elf_Rel *rel;
	const Elf_Rela *rela;

	switch (reltype) {
	case ELF_RELOC_REL:
		rel = (const Elf_Rel *)reldata;
		where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
		    dataaddr);
		addend = 0;
		rtype = ELF_R_TYPE(rel->r_info);
		symidx = ELF_R_SYM(rel->r_info);
		addend = 0;
		break;
	case ELF_RELOC_RELA:
		rela = (const Elf_Rela *)reldata;
		where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
		    dataaddr);
		addend = rela->r_addend;
		rtype = ELF_R_TYPE(rela->r_info);
		symidx = ELF_R_SYM(rela->r_info);
		break;
	default:
		return (EINVAL);
	}

	if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
		return (0);

	if (reltype == ELF_RELOC_REL)
		addend = *where;

/* XXX, definitions not available on i386. */
#define	R_X86_64_64		1
#define	R_X86_64_RELATIVE	8

	switch (rtype) {
	case R_X86_64_64:		/* S + A */
		addr = symaddr(ef, symidx);
		if (addr == 0)
			return (ESRCH);
		val = addr + addend;
		*where = val;
		break;
	case R_X86_64_RELATIVE:
		addr = (Elf_Addr)addend + relbase;
		val = addr;
		*where = val;
		break;
	default:
		printf("\nunhandled relocation type %u\n", (u_int)rtype);
		return (EFTYPE);
	}

	return (0);
#elif defined(__i386__) && __ELF_WORD_SIZE == 32
	Elf_Addr addend, addr, *where, val;
	Elf_Size rtype, symidx;
	const Elf_Rel *rel;
	const Elf_Rela *rela;

	switch (reltype) {
	case ELF_RELOC_REL:
		rel = (const Elf_Rel *)reldata;
		where = (Elf_Addr *)((char *)data + relbase + rel->r_offset -
		    dataaddr);
		addend = 0;
		rtype = ELF_R_TYPE(rel->r_info);
		symidx = ELF_R_SYM(rel->r_info);
		addend = 0;
		break;
	case ELF_RELOC_RELA:
		rela = (const Elf_Rela *)reldata;
		where = (Elf_Addr *)((char *)data + relbase + rela->r_offset -
		    dataaddr);
		addend = rela->r_addend;
		rtype = ELF_R_TYPE(rela->r_info);
		symidx = ELF_R_SYM(rela->r_info);
		break;
	default:
		return (EINVAL);
	}

	if ((char *)where < (char *)data || (char *)where >= (char *)data + len)
		return (0);

	if (reltype == ELF_RELOC_REL)
		addend = *where;

/* XXX, definitions not available on x86_64. */
#define R_386_32	1	/* Add symbol value. */
#define R_386_GLOB_DAT	6	/* Set GOT entry to data address. */
#define R_386_RELATIVE	8	/* Add load address of shared object. */

	switch (rtype) {
	case R_386_RELATIVE:
		addr = addend + relbase;
		*where = addr;
		break;
	case R_386_32:		/* S + A */
		addr = symaddr(ef, symidx);
		if (addr == 0)
			return (ESRCH);
		val = addr + addend;
		*where = val;
		break;
	default:
		printf("\nunhandled relocation type %u\n", (u_int)rtype);
		return (EFTYPE);
	}

	return (0);
#else
	return (EOPNOTSUPP);
#endif
}
Commit	Line	Data
6f3c5d3d SS	1	/*-
	2	* Copyright (c) 2003 Jake Burkholder.
	3	* Copyright 1996-1998 John D. Polstra.
	4	* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
	5	* Copyright (c) 1998 Peter Wemm <peter@freebsd.org>
	6	* All rights reserved.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	*
	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	20	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	27	* SUCH DAMAGE.
	28	*
	29	* $FreeBSD: src/sys/boot/common/reloc_elf.c,v 1.2 2005/12/18 04:52:35 marcel Exp $
	30	*/
	31
	32	#include <sys/types.h>
	33	#include <machine/elf.h>
	34
	35	#include <errno.h>
	36	#include <stand.h>
	37
	38	#define FREEBSD_ELF
	39	#include <link.h>
	40
	41	#include "bootstrap.h"
	42
	43	#define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l)
	44
	45	/*
	46	* Apply a single intra-module relocation to the data. `relbase' is the
	47	* target relocation base for the section (i.e. it corresponds to where
	48	* r_offset == 0). `dataaddr' is the relocated address corresponding to
	49	* the start of the data, and `len' is the number of bytes.
	50	*/
	51	int
	52	__elfN(reloc)(struct elf_file ef, symaddr_fn symaddr, const void *reldata,
	53	int reltype, Elf_Addr relbase, Elf_Addr dataaddr, void *data, size_t len)
	54	{
	55	#ifdef __sparc__
	56	Elf_Size w;
	57	const Elf_Rela *a;
	58
	59	switch (reltype) {
	60	case ELF_RELOC_RELA:
	61	a = reldata;
	62	if (relbase + a->r_offset >= dataaddr &&
	63	relbase + a->r_offset < dataaddr + len) {
	64	switch (ELF_R_TYPE(a->r_info)) {
65	case R_SPARC_RELATIVE:
66	w = relbase + a->r_addend;
67	bcopy(&w, (u_char *)data + (relbase +
68	a->r_offset - dataaddr), sizeof(w));
69	break;
70	default:
71	printf("\nunhandled relocation type %u\n",
72	(u_int)ELF_R_TYPE(a->r_info));
73	return (EFTYPE);
74	}
75	}
76	break;
77	}
78
79	return (0);
80	#elif defined(__i386__) && __ELF_WORD_SIZE == 64
81	Elf64_Addr *where, val;
82	Elf_Addr addend, addr;
83	Elf_Size rtype, symidx;
84	const Elf_Rel *rel;
85	const Elf_Rela *rela;
86
87	switch (reltype) {
88	case ELF_RELOC_REL:
89	rel = (const Elf_Rel *)reldata;
90	where = (Elf_Addr )((char )data + relbase + rel->r_offset -
91	dataaddr);
92	addend = 0;
93	rtype = ELF_R_TYPE(rel->r_info);
94	symidx = ELF_R_SYM(rel->r_info);
95	addend = 0;
96	break;
97	case ELF_RELOC_RELA:
98	rela = (const Elf_Rela *)reldata;
99	where = (Elf_Addr )((char )data + relbase + rela->r_offset -
100	dataaddr);
101	addend = rela->r_addend;
102	rtype = ELF_R_TYPE(rela->r_info);
103	symidx = ELF_R_SYM(rela->r_info);
104	break;
105	default:
106	return (EINVAL);
107	}
108
109	if ((char )where < (char )data \|\| (char )where >= (char )data + len)
110	return (0);
111
112	if (reltype == ELF_RELOC_REL)
113	addend = *where;
114
115	/* XXX, definitions not available on i386. */
116	#define R_X86_64_64 1
117	#define R_X86_64_RELATIVE 8
118
119	switch (rtype) {
120	case R_X86_64_64: /* S + A */
121	addr = symaddr(ef, symidx);
122	if (addr == 0)
123	return (ESRCH);
124	val = addr + addend;
125	*where = val;
126	break;
127	case R_X86_64_RELATIVE:
128	addr = (Elf_Addr)addend + relbase;
129	val = addr;
130	*where = val;
131	break;
132	default:
133	printf("\nunhandled relocation type %u\n", (u_int)rtype);
134	return (EFTYPE);
135	}
136
137	return (0);
138	#elif defined(__i386__) && __ELF_WORD_SIZE == 32
139	Elf_Addr addend, addr, *where, val;
140	Elf_Size rtype, symidx;
141	const Elf_Rel *rel;
142	const Elf_Rela *rela;
143
144	switch (reltype) {
145	case ELF_RELOC_REL:
146	rel = (const Elf_Rel *)reldata;
147	where = (Elf_Addr )((char )data + relbase + rel->r_offset -
148	dataaddr);
149	addend = 0;
150	rtype = ELF_R_TYPE(rel->r_info);
151	symidx = ELF_R_SYM(rel->r_info);
152	addend = 0;
153	break;
154	case ELF_RELOC_RELA:
155	rela = (const Elf_Rela *)reldata;
156	where = (Elf_Addr )((char )data + relbase + rela->r_offset -
157	dataaddr);
158	addend = rela->r_addend;
159	rtype = ELF_R_TYPE(rela->r_info);
160	symidx = ELF_R_SYM(rela->r_info);
161	break;
162	default:
163	return (EINVAL);
164	}
165
166	if ((char )where < (char )data \|\| (char )where >= (char )data + len)
167	return (0);
168
169	if (reltype == ELF_RELOC_REL)
170	addend = *where;
171
c1543a89	172	/* XXX, definitions not available on x86_64. */
6f3c5d3d SS	173	#define R_386_32 1 /* Add symbol value. */
	174	#define R_386_GLOB_DAT 6 /* Set GOT entry to data address. */
	175	#define R_386_RELATIVE 8 /* Add load address of shared object. */
	176
	177	switch (rtype) {
	178	case R_386_RELATIVE:
	179	addr = addend + relbase;
	180	*where = addr;
	181	break;
	182	case R_386_32: /* S + A */
	183	addr = symaddr(ef, symidx);
	184	if (addr == 0)
	185	return (ESRCH);
	186	val = addr + addend;
	187	*where = val;
	188	break;
	189	default:
	190	printf("\nunhandled relocation type %u\n", (u_int)rtype);
	191	return (EFTYPE);
	192	}
	193
	194	return (0);
	195	#else
	196	return (EOPNOTSUPP);
	197	#endif
	198	}