1 files changed, 467 insertions, 0 deletions

diff --git a/libexec/ld.so/amd64/rtld_machine.c b/libexec/ld.so/amd64/rtld_machine.c
new file mode 100644
index 00000000000..0c8e18643bb
--- /dev/null
+++ b/libexec/ld.so/amd64/rtld_machine.c
@@ -0,0 +1,467 @@
+/*	$OpenBSD: rtld_machine.c,v 1.1 2004/02/10 14:18:14 drahn Exp $ */
+
+/*
+ * Copyright (c) 2002,2004 Dale Rahn
+ * Copyright (c) 2001 Niklas Hallqvist
+ * Copyright (c) 2001 Artur Grabowski
+ *
+ * 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 ``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.
+ */
+/*-
+ * 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.
+ */
+
+#define _DYN_LOADER
+
+#include <sys/types.h>
+#include <sys/cdefs.h>
+#include <sys/mman.h>
+
+#include <nlist.h>
+#include <link.h>
+#include <signal.h>
+
+#include "syscall.h"
+#include "archdep.h"
+#include "resolve.h"
+
+void
+_dl_bcopy(const void *src, void *dest, int size)
+{
+	const unsigned char *psrc = src;
+	unsigned char *pdest = dest;
+	int i;
+
+	for (i = 0; i < size; i++)
+		pdest[i] = psrc[i];
+}
+
+/*
+ * 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_E		0x02000000		/* ERROR */
+#define _RF_SZ(s)	(((s) & 0xff) << 8)	/* memory target size */
+#define _RF_RS(s)	((s) & 0xff)		/* right shift */
+static int reloc_target_flags[] = {
+	0,							/*  0 NONE */
+	_RF_S|_RF_A|		_RF_SZ(64) | _RF_RS(0),		/*  1 _64*/
+	_RF_S|_RF_A|_RF_P|	_RF_SZ(32) | _RF_RS(0),		/*  2 PC32 */
+	_RF_G|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/*  3 GOT32 */
+	_RF_E|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/*  4 PLT32 */
+	_RF_S|			_RF_SZ(32) | _RF_RS(0),		/*  5 COPY */
+	_RF_S|			_RF_SZ(64) | _RF_RS(0),		/*  6 GLOB_DAT*/
+	_RF_S|			_RF_SZ(64) | _RF_RS(0),		/* 7 JUMP_SLOT*/
+	      _RF_A|	_RF_B|	_RF_SZ(64) | _RF_RS(0),		/*  8 RELATIVE*/
+	_RF_E,							/*  9 GOTPCREL*/
+	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 10 32 */
+	_RF_S|_RF_A|		_RF_SZ(32) | _RF_RS(0),		/* 11 32S */
+	_RF_S|_RF_A|		_RF_SZ(16) | _RF_RS(0),		/* 12 16 */
+	_RF_S|_RF_A|_RF_P|	_RF_SZ(16) | _RF_RS(0),		/* 13 PC16 */
+	_RF_S|_RF_A|		_RF_SZ(8) | _RF_RS(0),		/* 14 8 */
+	_RF_S|_RF_A|_RF_P|	_RF_SZ(8) | _RF_RS(0),		/* 15 PC8 */
+	_RF_E,							/* 16 DPTMOD64*/
+	_RF_E,							/* 17 DTPOFF64*/
+	_RF_E,							/* 18 TPOFF64 */
+	_RF_E,							/* 19 TLSGD */
+	_RF_E,							/* 20 TLSLD */
+	_RF_E,							/* 21 DTPOFF32*/
+	_RF_E,							/* 22 GOTTPOFF*/
+	_RF_E							/* 23 TPOFF32*/
+};
+
+#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)
+#define RELOC_ERROR(t)			(reloc_target_flags[t] & _RF_E)
+
+static long reloc_target_bitmask[] = {
+#define _BM(x)  (x == 64? ~0 : ~(-(1UL << (x))))
+	0,			/*  0 NONE */
+	_BM(64),		/*  1 _64*/
+	_BM(32),		/*  2 PC32 */
+	_BM(32),		/*  3 GOT32 */
+	_BM(32),		/*  4 PLT32 */
+	_BM(0),			/*  5 COPY */
+	_BM(64),		/*  6 GLOB_DAT*/
+	_BM(64),		/*  7 JUMP_SLOT*/
+	_BM(64),		/*  8 RELATIVE*/
+	_BM(32),		/*  9 GOTPCREL*/
+	_BM(32),		/* 10 32 */
+	_BM(32),		/* 11 32S */
+	_BM(16),		/* 12 16 */
+	_BM(16),		/* 13 PC16 */
+	_BM(8),			/* 14 8 */
+	_BM(8),			/* 15 PC8 */
+	0,			/* 16 DPTMOD64*/
+	0,			/* 17 DTPOFF64*/
+	0,			/* 18 TPOFF64 */
+	0,			/* 19 TLSGD */
+	0,			/* 20 TLSLD */
+	0,			/* 21 DTPOFF32*/
+	0,			/* 22 GOTTPOFF*/
+	0			/* 23 TPOFF32*/
+#undef _BM
+};
+#define RELOC_VALUE_BITMASK(t)	(reloc_target_bitmask[t])
+
+void _dl_reloc_plt(Elf_Addr *where, Elf_Addr value);
+
+#define R_TYPE(x) R_X86_64_ ## x
+
+int
+_dl_md_reloc(elf_object_t *object, int rel, int relsz)
+{
+	long	i;
+	long	numrel;
+	long	fails = 0;
+	Elf_Addr loff;
+	Elf_RelA *rels;
+	struct load_list *llist;
+
+	loff = object->load_offs;
+	numrel = object->Dyn.info[relsz] / sizeof(Elf_RelA);
+	rels = (Elf_RelA *)(object->Dyn.info[rel]);
+	if (rels == NULL)
+		return(0);
+
+	/*
+	 * unprotect some segments if we need it.
+	 */
+	if ((rel == DT_REL || rel == DT_RELA)) {
+		for (llist = object->load_list; llist != NULL; llist = llist->next) {
+			if (!(llist->prot & PROT_WRITE))
+				_dl_mprotect(llist->start, llist->size,
+				    llist->prot|PROT_WRITE);
+		}
+	}
+
+	for (i = 0; i < numrel; i++, rels++) {
+		Elf_Addr *where, value, ooff, mask;
+		Elf_Word type;
+		const Elf_Sym *sym, *this;
+		const char *symn;
+
+		type = ELF_R_TYPE(rels->r_info);
+
+		if (RELOC_ERROR(type)) {
+			_dl_printf("relocation error %d idx %d\n", type, i);
+			_dl_exit(20);
+		}
+			
+		if (type == R_TYPE(NONE))
+			continue;
+
+		if (type == R_TYPE(JUMP_SLOT) && rel != DT_JMPREL)
+			continue;
+
+		where = (Elf_Addr *)(rels->r_offset + loff);
+
+		if (RELOC_USE_ADDEND(type))
+#if 1
+			value = rels->r_addend;
+#else
+			value = *where & RELOC_VALUE_BITMASK(type);
+#endif
+		else
+			value = 0;
+
+		sym = NULL;
+		symn = NULL;
+		if (RELOC_RESOLVE_SYMBOL(type)) {
+			sym = object->dyn.symtab;
+			sym += ELF_R_SYM(rels->r_info);
+			symn = object->dyn.strtab + sym->st_name;
+
+			if (sym->st_shndx != SHN_UNDEF &&
+			    ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
+				value += loff;
+			} else {
+				this = NULL;
+				ooff = _dl_find_symbol_bysym(object,
+				    ELF_R_SYM(rels->r_info), _dl_objects,
+				    &this, SYM_SEARCH_ALL|SYM_WARNNOTFOUND|
+				    ((type == R_TYPE(JUMP_SLOT))?
+					SYM_PLT:SYM_NOTPLT),
+				    sym->st_size);
+				if (this == NULL) {
+resolve_failed:
+					_dl_printf("%s: %s: can't resolve "
+					    "reference '%s'\n",
+					    _dl_progname, object->load_name,
+					    symn);
+					fails++;
+					continue;
+				}
+				value += (Elf_Addr)(ooff + this->st_value);
+			}
+		}
+
+		if (type == R_TYPE(JUMP_SLOT)) {
+			_dl_reloc_plt(where, value);
+			continue;
+		}
+
+		if (type == R_TYPE(COPY)) {
+			void *dstaddr = where;
+			const void *srcaddr;
+			const Elf_Sym *dstsym = sym, *srcsym = NULL;
+			size_t size = dstsym->st_size;
+			Elf_Addr soff;
+
+			soff = _dl_find_symbol(symn, object->next, &srcsym,
+			    SYM_SEARCH_ALL|SYM_WARNNOTFOUND|
+			    ((type == R_TYPE(JUMP_SLOT)) ? SYM_PLT:SYM_NOTPLT),
+			    size, object);
+			if (srcsym == NULL)
+				goto resolve_failed;
+
+			srcaddr = (void *)(soff + srcsym->st_value);
+			_dl_bcopy(srcaddr, dstaddr, size);
+			continue;
+		}
+
+		if (RELOC_PC_RELATIVE(type))
+			value -= (Elf_Addr)where;
+		if (RELOC_BASE_RELATIVE(type))
+			value += loff;
+
+		mask = RELOC_VALUE_BITMASK(type);
+		value >>= RELOC_VALUE_RIGHTSHIFT(type);
+		value &= mask;
+
+		if (RELOC_UNALIGNED(type)) {
+			/* Handle unaligned relocations. */
+			Elf_Addr tmp = 0;
+			char *ptr = (char *)where;
+			int i, size = RELOC_TARGET_SIZE(type)/8;
+
+			/* Read it in one byte at a time. */
+			for (i=0; i<size; i++)
+				tmp = (tmp << 8) | ptr[i];
+
+			tmp &= ~mask;
+			tmp |= value;
+
+			/* Write it back out. */
+			for (i=0; i<size; i++)
+				ptr[i] = ((tmp >> (8*i)) & 0xff);
+		} else if (RELOC_TARGET_SIZE(type) > 32) {
+			*where &= ~mask;
+			*where |= value;
+		} else {
+			Elf32_Addr *where32 = (Elf32_Addr *)where;
+
+			*where32 &= ~mask;
+			*where32 |= value;
+		}
+	}
+
+	/* reprotect the unprotected segments */
+	if ((rel == DT_REL || rel == DT_RELA)) {
+		for (llist = object->load_list; llist != NULL; llist = llist->next) {
+			if (!(llist->prot & PROT_WRITE))
+				_dl_mprotect(llist->start, llist->size,
+				    llist->prot);
+		}
+	}
+
+	return (fails);
+}
+
+#if 0
+struct jmpslot {
+	u_short opcode;
+	u_short addr[2];
+	u_short reloc_index;
+#define JMPSLOT_RELOC_MASK              0xffff
+};
+#define JUMP    0xe990          /* NOP + JMP opcode */
+#endif
+
+void
+_dl_reloc_plt(Elf_Addr *where, Elf_Addr value)
+{
+	*where = value;
+}
+
+/*
+ * Resolve a symbol at run-time.
+ */
+Elf_Addr
+_dl_bind(elf_object_t *object, int index)
+{
+	Elf_Rel *rel;
+	Elf_Word *addr;
+	const Elf_Sym *sym, *this;
+	const char *symn;
+	Elf_Addr ooff;
+	sigset_t omask, nmask;
+
+	rel = (Elf_Rel *)(object->Dyn.info[DT_JMPREL]);
+
+	rel += index/sizeof(Elf_Rel);
+
+	sym = object->dyn.symtab;
+	sym += ELF_R_SYM(rel->r_info);
+	symn = object->dyn.strtab + sym->st_name;
+
+	addr = (Elf_Word *)(object->load_offs + rel->r_offset);
+	this = NULL;
+	ooff = _dl_find_symbol(symn, _dl_objects, &this,
+	    SYM_SEARCH_ALL|SYM_WARNNOTFOUND|SYM_PLT, sym->st_size, object);
+	if (this == NULL) {
+		_dl_printf("lazy binding failed!\n");
+		*((int *)0) = 0;        /* XXX */
+	}
+
+	/* if GOT is protected, allow the write */
+	if (object->got_size != 0) {
+		sigfillset(&nmask);
+		_dl_sigprocmask(SIG_BLOCK, &nmask, &omask);
+		_dl_mprotect((void*)object->got_start, object->got_size,
+		    PROT_READ|PROT_WRITE);
+	}
+
+	_dl_reloc_plt((Elf_Addr *)addr, ooff + this->st_value);
+
+	/* put the GOT back to RO */
+	if (object->got_size != 0) {
+		_dl_mprotect((void*)object->got_start, object->got_size,
+		    PROT_READ);
+		_dl_sigprocmask(SIG_SETMASK, &omask, NULL);
+	}
+
+	return((Elf_Addr)ooff + this->st_value);
+}
+
+void
+_dl_md_reloc_got(elf_object_t *object, int lazy)
+{
+	extern void _dl_bind_start(void);       /* XXX */
+	Elf_Addr *pltgot = (Elf_Addr *)object->Dyn.info[DT_PLTGOT];
+	int i, num;
+	Elf_RelA *rel;
+	Elf_Addr ooff;
+	const Elf_Sym *this;
+
+	if (pltgot == NULL)
+		return; /* it is possible to have no PLT/GOT relocations */
+
+	pltgot[1] = (Elf_Addr)object;
+	pltgot[2] = (Elf_Addr)&_dl_bind_start;
+
+	if (object->Dyn.info[DT_PLTREL] != DT_RELA)
+		return;
+
+	object->got_addr = NULL;
+	object->got_size = 0;
+	this = NULL;
+	ooff = _dl_find_symbol("__got_start", object, &this,
+	    SYM_SEARCH_SELF|SYM_NOWARNNOTFOUND|SYM_PLT, 0, object);
+	if (this != NULL)
+		object->got_addr = ooff + this->st_value;
+
+	this = NULL;
+	ooff = _dl_find_symbol("__got_end", object, &this,
+	    SYM_SEARCH_SELF|SYM_NOWARNNOTFOUND|SYM_PLT, 0, object);
+	if (this != NULL)
+		object->got_size = ooff + this->st_value  - object->got_addr;
+
+	if (object->got_addr == NULL)
+		object->got_start = NULL;
+	else {
+		object->got_start = ELF_TRUNC(object->got_addr, _dl_pagesz);
+		object->got_size += object->got_addr - object->got_start;
+		object->got_size = ELF_ROUND(object->got_size, _dl_pagesz);
+	}
+
+	if (!lazy) {
+		_dl_md_reloc(object, DT_JMPREL, DT_PLTRELSZ);
+	} else {
+		rel = (Elf_RelA *)(object->Dyn.info[DT_JMPREL]);
+		num = (object->Dyn.info[DT_PLTRELSZ]);
+		for (i = 0; i < num/sizeof(Elf_RelA); i++, rel++) {
+			Elf_Addr *where;
+			where = (Elf_Addr *)(rel->r_offset + object->load_offs);
+			*where = object->load_offs + rel->r_addend;
+		}
+
+	}
+	/* PLT is already RO on i386, no point in mprotecting it, just GOT */
+	if (object->got_size != 0)
+		_dl_mprotect((void*)object->got_start, object->got_size,
+		    PROT_READ);
+}