xref: /freebsd/sys/kern/link_elf.c (revision ecd8245e0d7784bcd78dafce233f303eee765068)
1a4f67738SDoug Rabson /*-
28a36da99SPedro F. Giffuni  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
38a36da99SPedro F. Giffuni  *
4326e27d8SDoug Rabson  * Copyright (c) 1998-2000 Doug Rabson
5a4f67738SDoug Rabson  * All rights reserved.
6a4f67738SDoug Rabson  *
7a4f67738SDoug Rabson  * Redistribution and use in source and binary forms, with or without
8a4f67738SDoug Rabson  * modification, are permitted provided that the following conditions
9a4f67738SDoug Rabson  * are met:
10a4f67738SDoug Rabson  * 1. Redistributions of source code must retain the above copyright
11a4f67738SDoug Rabson  *    notice, this list of conditions and the following disclaimer.
12a4f67738SDoug Rabson  * 2. Redistributions in binary form must reproduce the above copyright
13a4f67738SDoug Rabson  *    notice, this list of conditions and the following disclaimer in the
14a4f67738SDoug Rabson  *    documentation and/or other materials provided with the distribution.
15a4f67738SDoug Rabson  *
16a4f67738SDoug Rabson  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17a4f67738SDoug Rabson  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18a4f67738SDoug Rabson  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19a4f67738SDoug Rabson  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20a4f67738SDoug Rabson  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21a4f67738SDoug Rabson  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22a4f67738SDoug Rabson  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23a4f67738SDoug Rabson  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24a4f67738SDoug Rabson  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25a4f67738SDoug Rabson  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26a4f67738SDoug Rabson  * SUCH DAMAGE.
27a4f67738SDoug Rabson  */
28a4f67738SDoug Rabson 
29677b542eSDavid E. O'Brien #include <sys/cdefs.h>
30677b542eSDavid E. O'Brien __FBSDID("$FreeBSD$");
31677b542eSDavid E. O'Brien 
32a2024a3eSJohn Birrell #include "opt_ddb.h"
33ecb01c64SMarcel Moolenaar #include "opt_gdb.h"
34326e27d8SDoug Rabson 
35a4f67738SDoug Rabson #include <sys/param.h>
36a4f67738SDoug Rabson #include <sys/systm.h>
375ad6c3b1SBruce Evans #ifdef GPROF
385ad6c3b1SBruce Evans #include <sys/gmon.h>
395ad6c3b1SBruce Evans #endif
40fb919e4dSMark Murray #include <sys/kernel.h>
41fb919e4dSMark Murray #include <sys/lock.h>
42a4f67738SDoug Rabson #include <sys/malloc.h>
431aa696baSMark Johnston #ifdef SPARSE_MAPPING
441aa696baSMark Johnston #include <sys/mman.h>
451aa696baSMark Johnston #endif
46c0b824f9SDima Dorfman #include <sys/mutex.h>
4762d615d5SJohn Baldwin #include <sys/mount.h>
4850c202c5SJeff Roberson #include <sys/pcpu.h>
49a4f67738SDoug Rabson #include <sys/proc.h>
50a4f67738SDoug Rabson #include <sys/namei.h>
51a4f67738SDoug Rabson #include <sys/fcntl.h>
52a4f67738SDoug Rabson #include <sys/vnode.h>
53a4f67738SDoug Rabson #include <sys/linker.h>
54eb5a41cfSLeandro Lupori #include <sys/sysctl.h>
55fb919e4dSMark Murray 
56a4f67738SDoug Rabson #include <machine/elf.h>
57a4f67738SDoug Rabson 
58eddfbb76SRobert Watson #include <net/vnet.h>
59eddfbb76SRobert Watson 
60aed55708SRobert Watson #include <security/mac/mac_framework.h>
61aed55708SRobert Watson 
62fe3db7c7SDoug Rabson #include <vm/vm.h>
63fe3db7c7SDoug Rabson #include <vm/vm_param.h>
64d1f088daSPeter Wemm #ifdef SPARSE_MAPPING
65fe3db7c7SDoug Rabson #include <vm/vm_object.h>
66fe3db7c7SDoug Rabson #include <vm/vm_kern.h>
67fe3db7c7SDoug Rabson #include <vm/vm_extern.h>
68d1f088daSPeter Wemm #endif
69fe3db7c7SDoug Rabson #include <vm/pmap.h>
70fe3db7c7SDoug Rabson #include <vm/vm_map.h>
71fb919e4dSMark Murray 
72f9980387SPeter Wemm #include <sys/link_elf.h>
73fe3db7c7SDoug Rabson 
74326e27d8SDoug Rabson #include "linker_if.h"
75a4f67738SDoug Rabson 
761a330eb0SPeter Wemm #define MAXSEGS 4
771a330eb0SPeter Wemm 
784f2945f8SDavid E. O'Brien typedef struct elf_file {
794f2945f8SDavid E. O'Brien 	struct linker_file lf;		/* Common fields */
804f2945f8SDavid E. O'Brien 	int		preloaded;	/* Was file pre-loaded */
814f2945f8SDavid E. O'Brien 	caddr_t		address;	/* Relocation address */
824f2945f8SDavid E. O'Brien #ifdef SPARSE_MAPPING
834f2945f8SDavid E. O'Brien 	vm_object_t	object;		/* VM object to hold file pages */
844f2945f8SDavid E. O'Brien #endif
854f2945f8SDavid E. O'Brien 	Elf_Dyn		*dynamic;	/* Symbol table etc. */
864f2945f8SDavid E. O'Brien 	Elf_Hashelt	nbuckets;	/* DT_HASH info */
874f2945f8SDavid E. O'Brien 	Elf_Hashelt	nchains;
884f2945f8SDavid E. O'Brien 	const Elf_Hashelt *buckets;
894f2945f8SDavid E. O'Brien 	const Elf_Hashelt *chains;
904f2945f8SDavid E. O'Brien 	caddr_t		hash;
914f2945f8SDavid E. O'Brien 	caddr_t		strtab;		/* DT_STRTAB */
924f2945f8SDavid E. O'Brien 	int		strsz;		/* DT_STRSZ */
934f2945f8SDavid E. O'Brien 	const Elf_Sym	*symtab;		/* DT_SYMTAB */
944f2945f8SDavid E. O'Brien 	Elf_Addr	*got;		/* DT_PLTGOT */
954f2945f8SDavid E. O'Brien 	const Elf_Rel	*pltrel;	/* DT_JMPREL */
964f2945f8SDavid E. O'Brien 	int		pltrelsize;	/* DT_PLTRELSZ */
974f2945f8SDavid E. O'Brien 	const Elf_Rela	*pltrela;	/* DT_JMPREL */
984f2945f8SDavid E. O'Brien 	int		pltrelasize;	/* DT_PLTRELSZ */
994f2945f8SDavid E. O'Brien 	const Elf_Rel	*rel;		/* DT_REL */
1004f2945f8SDavid E. O'Brien 	int		relsize;	/* DT_RELSZ */
1014f2945f8SDavid E. O'Brien 	const Elf_Rela	*rela;		/* DT_RELA */
1024f2945f8SDavid E. O'Brien 	int		relasize;	/* DT_RELASZ */
1034f2945f8SDavid E. O'Brien 	caddr_t		modptr;
1044f2945f8SDavid E. O'Brien 	const Elf_Sym	*ddbsymtab;	/* The symbol table we are using */
1054f2945f8SDavid E. O'Brien 	long		ddbsymcnt;	/* Number of symbols */
1064f2945f8SDavid E. O'Brien 	caddr_t		ddbstrtab;	/* String table */
1074f2945f8SDavid E. O'Brien 	long		ddbstrcnt;	/* number of bytes in string table */
1084f2945f8SDavid E. O'Brien 	caddr_t		symbase;	/* malloc'ed symbold base */
1094f2945f8SDavid E. O'Brien 	caddr_t		strbase;	/* malloc'ed string base */
1104f2945f8SDavid E. O'Brien 	caddr_t		ctftab;		/* CTF table */
1114f2945f8SDavid E. O'Brien 	long		ctfcnt;		/* number of bytes in CTF table */
1124f2945f8SDavid E. O'Brien 	caddr_t		ctfoff;		/* CTF offset table */
1134f2945f8SDavid E. O'Brien 	caddr_t		typoff;		/* Type offset table */
1144f2945f8SDavid E. O'Brien 	long		typlen;		/* Number of type entries. */
11550c202c5SJeff Roberson 	Elf_Addr	pcpu_start;	/* Pre-relocation pcpu set start. */
11650c202c5SJeff Roberson 	Elf_Addr	pcpu_stop;	/* Pre-relocation pcpu set stop. */
11750c202c5SJeff Roberson 	Elf_Addr	pcpu_base;	/* Relocated pcpu set address. */
118eddfbb76SRobert Watson #ifdef VIMAGE
119eddfbb76SRobert Watson 	Elf_Addr	vnet_start;	/* Pre-relocation vnet set start. */
120eddfbb76SRobert Watson 	Elf_Addr	vnet_stop;	/* Pre-relocation vnet set stop. */
121eddfbb76SRobert Watson 	Elf_Addr	vnet_base;	/* Relocated vnet set address. */
122eddfbb76SRobert Watson #endif
1234f2945f8SDavid E. O'Brien #ifdef GDB
1244f2945f8SDavid E. O'Brien 	struct link_map	gdb;		/* hooks for gdb */
1254f2945f8SDavid E. O'Brien #endif
1264f2945f8SDavid E. O'Brien } *elf_file_t;
1274f2945f8SDavid E. O'Brien 
12847813f5dSMikolaj Golub struct elf_set {
12947813f5dSMikolaj Golub 	Elf_Addr	es_start;
13047813f5dSMikolaj Golub 	Elf_Addr	es_stop;
13147813f5dSMikolaj Golub 	Elf_Addr	es_base;
13247813f5dSMikolaj Golub 	TAILQ_ENTRY(elf_set)	es_link;
13347813f5dSMikolaj Golub };
13447813f5dSMikolaj Golub 
13547813f5dSMikolaj Golub TAILQ_HEAD(elf_set_head, elf_set);
13647813f5dSMikolaj Golub 
137a2024a3eSJohn Birrell #include <kern/kern_ctf.c>
138a2024a3eSJohn Birrell 
139c143d6c2SMarcel Moolenaar static int	link_elf_link_common_finish(linker_file_t);
14054823af2SPeter Wemm static int	link_elf_link_preload(linker_class_t cls,
141326e27d8SDoug Rabson 				      const char *, linker_file_t *);
14254823af2SPeter Wemm static int	link_elf_link_preload_finish(linker_file_t);
1432f22b3ffSMatthew D Fleming static int	link_elf_load_file(linker_class_t, const char *,
1442f22b3ffSMatthew D Fleming 		    linker_file_t *);
145326e27d8SDoug Rabson static int	link_elf_lookup_symbol(linker_file_t, const char *,
146326e27d8SDoug Rabson 		    c_linker_sym_t *);
14795c20fafSKonstantin Belousov static int	link_elf_lookup_debug_symbol(linker_file_t, const char *,
14895c20fafSKonstantin Belousov 		    c_linker_sym_t *);
1492f22b3ffSMatthew D Fleming static int	link_elf_symbol_values(linker_file_t, c_linker_sym_t,
1502f22b3ffSMatthew D Fleming 		    linker_symval_t *);
15195c20fafSKonstantin Belousov static int	link_elf_debug_symbol_values(linker_file_t, c_linker_sym_t,
15295c20fafSKonstantin Belousov 		    linker_symval_t*);
1532f22b3ffSMatthew D Fleming static int	link_elf_search_symbol(linker_file_t, caddr_t,
1542f22b3ffSMatthew D Fleming 		    c_linker_sym_t *, long *);
155326e27d8SDoug Rabson 
156326e27d8SDoug Rabson static void	link_elf_unload_file(linker_file_t);
15754823af2SPeter Wemm static void	link_elf_unload_preload(linker_file_t);
158f41325dbSPeter Wemm static int	link_elf_lookup_set(linker_file_t, const char *,
159f41325dbSPeter Wemm 		    void ***, void ***, int *);
160bb9fe9ddSBrian Feldman static int	link_elf_each_function_name(linker_file_t,
1612f22b3ffSMatthew D Fleming 		    int (*)(const char *, void *), void *);
162a2024a3eSJohn Birrell static int	link_elf_each_function_nameval(linker_file_t,
1632f22b3ffSMatthew D Fleming 		    linker_function_nameval_callback_t, void *);
1647251b4bfSJake Burkholder static void	link_elf_reloc_local(linker_file_t);
16500a5db46SStacey Son static long	link_elf_symtab_get(linker_file_t, const Elf_Sym **);
16600a5db46SStacey Son static long	link_elf_strtab_get(linker_file_t, caddr_t *);
167cff8c6f2SKonstantin Belousov static int	elf_lookup(linker_file_t, Elf_Size, int, Elf_Addr *);
168326e27d8SDoug Rabson 
169326e27d8SDoug Rabson static kobj_method_t link_elf_methods[] = {
170326e27d8SDoug Rabson 	KOBJMETHOD(linker_lookup_symbol,	link_elf_lookup_symbol),
17195c20fafSKonstantin Belousov 	KOBJMETHOD(linker_lookup_debug_symbol,	link_elf_lookup_debug_symbol),
172326e27d8SDoug Rabson 	KOBJMETHOD(linker_symbol_values,	link_elf_symbol_values),
17395c20fafSKonstantin Belousov 	KOBJMETHOD(linker_debug_symbol_values,	link_elf_debug_symbol_values),
174326e27d8SDoug Rabson 	KOBJMETHOD(linker_search_symbol,	link_elf_search_symbol),
175326e27d8SDoug Rabson 	KOBJMETHOD(linker_unload,		link_elf_unload_file),
17654823af2SPeter Wemm 	KOBJMETHOD(linker_load_file,		link_elf_load_file),
17754823af2SPeter Wemm 	KOBJMETHOD(linker_link_preload,		link_elf_link_preload),
17854823af2SPeter Wemm 	KOBJMETHOD(linker_link_preload_finish,	link_elf_link_preload_finish),
179f41325dbSPeter Wemm 	KOBJMETHOD(linker_lookup_set,		link_elf_lookup_set),
180bb9fe9ddSBrian Feldman 	KOBJMETHOD(linker_each_function_name,	link_elf_each_function_name),
181a2024a3eSJohn Birrell 	KOBJMETHOD(linker_each_function_nameval, link_elf_each_function_nameval),
182a2024a3eSJohn Birrell 	KOBJMETHOD(linker_ctf_get,		link_elf_ctf_get),
18300a5db46SStacey Son 	KOBJMETHOD(linker_symtab_get,		link_elf_symtab_get),
18400a5db46SStacey Son 	KOBJMETHOD(linker_strtab_get,		link_elf_strtab_get),
1856d775f0bSMark Johnston 	KOBJMETHOD_END
186326e27d8SDoug Rabson };
187326e27d8SDoug Rabson 
188326e27d8SDoug Rabson static struct linker_class link_elf_class = {
189326e27d8SDoug Rabson #if ELF_TARG_CLASS == ELFCLASS32
190326e27d8SDoug Rabson 	"elf32",
191326e27d8SDoug Rabson #else
192326e27d8SDoug Rabson 	"elf64",
193326e27d8SDoug Rabson #endif
194326e27d8SDoug Rabson 	link_elf_methods, sizeof(struct elf_file)
195326e27d8SDoug Rabson };
196326e27d8SDoug Rabson 
197*ecd8245eSKonstantin Belousov static bool link_elf_leak_locals = true;
198*ecd8245eSKonstantin Belousov SYSCTL_BOOL(_debug, OID_AUTO, link_elf_leak_locals,
199*ecd8245eSKonstantin Belousov     CTLFLAG_RWTUN, &link_elf_leak_locals, 0,
200*ecd8245eSKonstantin Belousov     "Allow local symbols to participate in global module symbol resolution");
201*ecd8245eSKonstantin Belousov 
20236716fe2SMark Johnston typedef int (*elf_reloc_fn)(linker_file_t lf, Elf_Addr relocbase,
20336716fe2SMark Johnston     const void *data, int type, elf_lookup_fn lookup);
20436716fe2SMark Johnston 
2052f22b3ffSMatthew D Fleming static int	parse_dynamic(elf_file_t);
2062f22b3ffSMatthew D Fleming static int	relocate_file(elf_file_t);
20736716fe2SMark Johnston static int	relocate_file1(elf_file_t ef, elf_lookup_fn lookup,
20836716fe2SMark Johnston 		    elf_reloc_fn reloc, bool ifuncs);
2092f22b3ffSMatthew D Fleming static int	link_elf_preload_parse_symbols(elf_file_t);
210326e27d8SDoug Rabson 
21147813f5dSMikolaj Golub static struct elf_set_head set_pcpu_list;
21247813f5dSMikolaj Golub #ifdef VIMAGE
21347813f5dSMikolaj Golub static struct elf_set_head set_vnet_list;
21447813f5dSMikolaj Golub #endif
21547813f5dSMikolaj Golub 
21647813f5dSMikolaj Golub static void
21747813f5dSMikolaj Golub elf_set_add(struct elf_set_head *list, Elf_Addr start, Elf_Addr stop, Elf_Addr base)
21847813f5dSMikolaj Golub {
21947813f5dSMikolaj Golub 	struct elf_set *set, *iter;
22047813f5dSMikolaj Golub 
22147813f5dSMikolaj Golub 	set = malloc(sizeof(*set), M_LINKER, M_WAITOK);
22247813f5dSMikolaj Golub 	set->es_start = start;
22347813f5dSMikolaj Golub 	set->es_stop = stop;
22447813f5dSMikolaj Golub 	set->es_base = base;
22547813f5dSMikolaj Golub 
22647813f5dSMikolaj Golub 	TAILQ_FOREACH(iter, list, es_link) {
22747813f5dSMikolaj Golub 		KASSERT((set->es_start < iter->es_start && set->es_stop < iter->es_stop) ||
22847813f5dSMikolaj Golub 		    (set->es_start > iter->es_start && set->es_stop > iter->es_stop),
22947813f5dSMikolaj Golub 		    ("linker sets intersection: to insert: 0x%jx-0x%jx; inserted: 0x%jx-0x%jx",
23047813f5dSMikolaj Golub 		    (uintmax_t)set->es_start, (uintmax_t)set->es_stop,
23147813f5dSMikolaj Golub 		    (uintmax_t)iter->es_start, (uintmax_t)iter->es_stop));
23247813f5dSMikolaj Golub 
23347813f5dSMikolaj Golub 		if (iter->es_start > set->es_start) {
23447813f5dSMikolaj Golub 			TAILQ_INSERT_BEFORE(iter, set, es_link);
23547813f5dSMikolaj Golub 			break;
23647813f5dSMikolaj Golub 		}
23747813f5dSMikolaj Golub 	}
23847813f5dSMikolaj Golub 
23947813f5dSMikolaj Golub 	if (iter == NULL)
24047813f5dSMikolaj Golub 		TAILQ_INSERT_TAIL(list, set, es_link);
24147813f5dSMikolaj Golub }
24247813f5dSMikolaj Golub 
24347813f5dSMikolaj Golub static int
24447813f5dSMikolaj Golub elf_set_find(struct elf_set_head *list, Elf_Addr addr, Elf_Addr *start, Elf_Addr *base)
24547813f5dSMikolaj Golub {
24647813f5dSMikolaj Golub 	struct elf_set *set;
24747813f5dSMikolaj Golub 
24847813f5dSMikolaj Golub 	TAILQ_FOREACH(set, list, es_link) {
24947813f5dSMikolaj Golub 		if (addr < set->es_start)
25047813f5dSMikolaj Golub 			return (0);
25147813f5dSMikolaj Golub 		if (addr < set->es_stop) {
25247813f5dSMikolaj Golub 			*start = set->es_start;
25347813f5dSMikolaj Golub 			*base = set->es_base;
25447813f5dSMikolaj Golub 			return (1);
25547813f5dSMikolaj Golub 		}
25647813f5dSMikolaj Golub 	}
25747813f5dSMikolaj Golub 
25847813f5dSMikolaj Golub 	return (0);
25947813f5dSMikolaj Golub }
26047813f5dSMikolaj Golub 
26147813f5dSMikolaj Golub static void
26247813f5dSMikolaj Golub elf_set_delete(struct elf_set_head *list, Elf_Addr start)
26347813f5dSMikolaj Golub {
26447813f5dSMikolaj Golub 	struct elf_set *set;
26547813f5dSMikolaj Golub 
26647813f5dSMikolaj Golub 	TAILQ_FOREACH(set, list, es_link) {
26747813f5dSMikolaj Golub 		if (start < set->es_start)
26847813f5dSMikolaj Golub 			break;
26947813f5dSMikolaj Golub 		if (start == set->es_start) {
27047813f5dSMikolaj Golub 			TAILQ_REMOVE(list, set, es_link);
27147813f5dSMikolaj Golub 			free(set, M_LINKER);
27247813f5dSMikolaj Golub 			return;
27347813f5dSMikolaj Golub 		}
27447813f5dSMikolaj Golub 	}
27547813f5dSMikolaj Golub 	KASSERT(0, ("deleting unknown linker set (start = 0x%jx)",
27647813f5dSMikolaj Golub 	    (uintmax_t)start));
27747813f5dSMikolaj Golub }
27847813f5dSMikolaj Golub 
279ecb01c64SMarcel Moolenaar #ifdef GDB
2802f22b3ffSMatthew D Fleming static void	r_debug_state(struct r_debug *, struct link_map *);
281326e27d8SDoug Rabson 
282326e27d8SDoug Rabson /*
283326e27d8SDoug Rabson  * A list of loaded modules for GDB to use for loading symbols.
284326e27d8SDoug Rabson  */
285326e27d8SDoug Rabson struct r_debug r_debug;
286326e27d8SDoug Rabson 
2872f22b3ffSMatthew D Fleming #define GDB_STATE(s) do {				\
2882f22b3ffSMatthew D Fleming 	r_debug.r_state = s; r_debug_state(NULL, NULL);	\
2892f22b3ffSMatthew D Fleming } while (0)
290326e27d8SDoug Rabson 
291326e27d8SDoug Rabson /*
292326e27d8SDoug Rabson  * Function for the debugger to set a breakpoint on to gain control.
293326e27d8SDoug Rabson  */
29437c84183SPoul-Henning Kamp static void
295ca29467eSJohn Baldwin r_debug_state(struct r_debug *dummy_one __unused,
296ca29467eSJohn Baldwin 	      struct link_map *dummy_two __unused)
297326e27d8SDoug Rabson {
298326e27d8SDoug Rabson }
299326e27d8SDoug Rabson 
3001720979bSMarcel Moolenaar static void
3011720979bSMarcel Moolenaar link_elf_add_gdb(struct link_map *l)
3021720979bSMarcel Moolenaar {
3031720979bSMarcel Moolenaar 	struct link_map *prev;
3041720979bSMarcel Moolenaar 
305c143d6c2SMarcel Moolenaar 	l->l_next = NULL;
306c143d6c2SMarcel Moolenaar 
307c143d6c2SMarcel Moolenaar 	if (r_debug.r_map == NULL) {
308c143d6c2SMarcel Moolenaar 		/* Add first. */
309c143d6c2SMarcel Moolenaar 		l->l_prev = NULL;
310c143d6c2SMarcel Moolenaar 		r_debug.r_map = l;
311c143d6c2SMarcel Moolenaar 	} else {
312c143d6c2SMarcel Moolenaar 		/* Append to list. */
3132f22b3ffSMatthew D Fleming 		for (prev = r_debug.r_map;
3142f22b3ffSMatthew D Fleming 		    prev->l_next != NULL;
3152f22b3ffSMatthew D Fleming 		    prev = prev->l_next)
3161720979bSMarcel Moolenaar 			;
3171720979bSMarcel Moolenaar 		l->l_prev = prev;
3181720979bSMarcel Moolenaar 		prev->l_next = l;
3191720979bSMarcel Moolenaar 	}
320c143d6c2SMarcel Moolenaar }
3211720979bSMarcel Moolenaar 
3221720979bSMarcel Moolenaar static void
3231720979bSMarcel Moolenaar link_elf_delete_gdb(struct link_map *l)
3241720979bSMarcel Moolenaar {
3251720979bSMarcel Moolenaar 	if (l->l_prev == NULL) {
326c143d6c2SMarcel Moolenaar 		/* Remove first. */
3271720979bSMarcel Moolenaar 		if ((r_debug.r_map = l->l_next) != NULL)
3281720979bSMarcel Moolenaar 			l->l_next->l_prev = NULL;
329c143d6c2SMarcel Moolenaar 	} else {
330c143d6c2SMarcel Moolenaar 		/* Remove any but first. */
3311720979bSMarcel Moolenaar 		if ((l->l_prev->l_next = l->l_next) != NULL)
3321720979bSMarcel Moolenaar 			l->l_next->l_prev = l->l_prev;
3331720979bSMarcel Moolenaar 	}
334c143d6c2SMarcel Moolenaar }
335ecb01c64SMarcel Moolenaar #endif /* GDB */
336a4f67738SDoug Rabson 
3374f2945f8SDavid E. O'Brien /*
3384f2945f8SDavid E. O'Brien  * The kernel symbol table starts here.
3394f2945f8SDavid E. O'Brien  */
3404f2945f8SDavid E. O'Brien extern struct _dynamic _DYNAMIC;
3414f2945f8SDavid E. O'Brien 
342a4f67738SDoug Rabson static void
343552f9f63SEdwin Groothuis link_elf_error(const char *filename, const char *s)
3441720979bSMarcel Moolenaar {
345552f9f63SEdwin Groothuis 	if (filename == NULL)
3461720979bSMarcel Moolenaar 		printf("kldload: %s\n", s);
347552f9f63SEdwin Groothuis 	else
348552f9f63SEdwin Groothuis 		printf("kldload: %s: %s\n", filename, s);
3491720979bSMarcel Moolenaar }
3501720979bSMarcel Moolenaar 
3510067051fSMarcel Moolenaar static void
3520067051fSMarcel Moolenaar link_elf_invoke_ctors(caddr_t addr, size_t size)
3530067051fSMarcel Moolenaar {
3540067051fSMarcel Moolenaar 	void (**ctor)(void);
3550067051fSMarcel Moolenaar 	size_t i, cnt;
3560067051fSMarcel Moolenaar 
3570067051fSMarcel Moolenaar 	if (addr == NULL || size == 0)
3580067051fSMarcel Moolenaar 		return;
3590067051fSMarcel Moolenaar 	cnt = size / sizeof(*ctor);
3600067051fSMarcel Moolenaar 	ctor = (void *)addr;
3610067051fSMarcel Moolenaar 	for (i = 0; i < cnt; i++) {
3620067051fSMarcel Moolenaar 		if (ctor[i] != NULL)
3630067051fSMarcel Moolenaar 			(*ctor[i])();
3640067051fSMarcel Moolenaar 	}
3650067051fSMarcel Moolenaar }
3660067051fSMarcel Moolenaar 
367c143d6c2SMarcel Moolenaar /*
368c143d6c2SMarcel Moolenaar  * Actions performed after linking/loading both the preloaded kernel and any
369c143d6c2SMarcel Moolenaar  * modules; whether preloaded or dynamicly loaded.
370c143d6c2SMarcel Moolenaar  */
371c143d6c2SMarcel Moolenaar static int
372c143d6c2SMarcel Moolenaar link_elf_link_common_finish(linker_file_t lf)
373c143d6c2SMarcel Moolenaar {
374ecb01c64SMarcel Moolenaar #ifdef GDB
375c143d6c2SMarcel Moolenaar 	elf_file_t ef = (elf_file_t)lf;
376c143d6c2SMarcel Moolenaar 	char *newfilename;
377c143d6c2SMarcel Moolenaar #endif
3781aeb23cdSMarcel Moolenaar 	int error;
3791aeb23cdSMarcel Moolenaar 
3801aeb23cdSMarcel Moolenaar 	/* Notify MD code that a module is being loaded. */
3811aeb23cdSMarcel Moolenaar 	error = elf_cpu_load_file(lf);
3822f22b3ffSMatthew D Fleming 	if (error != 0)
3831aeb23cdSMarcel Moolenaar 		return (error);
384c143d6c2SMarcel Moolenaar 
385ecb01c64SMarcel Moolenaar #ifdef GDB
386c143d6c2SMarcel Moolenaar 	GDB_STATE(RT_ADD);
387c143d6c2SMarcel Moolenaar 	ef->gdb.l_addr = lf->address;
388a163d034SWarner Losh 	newfilename = malloc(strlen(lf->filename) + 1, M_LINKER, M_WAITOK);
389c143d6c2SMarcel Moolenaar 	strcpy(newfilename, lf->filename);
390c143d6c2SMarcel Moolenaar 	ef->gdb.l_name = newfilename;
391c143d6c2SMarcel Moolenaar 	ef->gdb.l_ld = ef->dynamic;
392c143d6c2SMarcel Moolenaar 	link_elf_add_gdb(&ef->gdb);
393c143d6c2SMarcel Moolenaar 	GDB_STATE(RT_CONSISTENT);
394c143d6c2SMarcel Moolenaar #endif
395c143d6c2SMarcel Moolenaar 
3960067051fSMarcel Moolenaar 	/* Invoke .ctors */
3970067051fSMarcel Moolenaar 	link_elf_invoke_ctors(lf->ctors_addr, lf->ctors_size);
398c143d6c2SMarcel Moolenaar 	return (0);
399c143d6c2SMarcel Moolenaar }
400c143d6c2SMarcel Moolenaar 
4019411e24dSBrandon Bergren #ifdef RELOCATABLE_KERNEL
40240b664f6SBrandon Bergren /*
40340b664f6SBrandon Bergren  * __startkernel and __endkernel are symbols set up as relocation canaries.
40440b664f6SBrandon Bergren  *
40540b664f6SBrandon Bergren  * They are defined in locore to reference linker script symbols at the
40640b664f6SBrandon Bergren  * beginning and end of the LOAD area. This has the desired side effect of
40740b664f6SBrandon Bergren  * giving us variables that have relative relocations pointing at them, so
40840b664f6SBrandon Bergren  * relocation of the kernel object will cause the variables to be updated
40940b664f6SBrandon Bergren  * automatically by the runtime linker when we initialize.
41040b664f6SBrandon Bergren  *
41140b664f6SBrandon Bergren  * There are two main reasons to relocate the kernel:
41240b664f6SBrandon Bergren  * 1) If the loader needed to load the kernel at an alternate load address.
41340b664f6SBrandon Bergren  * 2) If the kernel is switching address spaces on machines like POWER9
41440b664f6SBrandon Bergren  *    under Radix where the high bits of the effective address are used to
41540b664f6SBrandon Bergren  *    differentiate between hypervisor, host, guest, and problem state.
41640b664f6SBrandon Bergren  */
417ee900504SNathan Whitehorn extern vm_offset_t __startkernel, __endkernel;
4189411e24dSBrandon Bergren #endif
419c6014c73SNathan Whitehorn 
420eb5a41cfSLeandro Lupori static unsigned long kern_relbase = KERNBASE;
421eb5a41cfSLeandro Lupori 
422eb5a41cfSLeandro Lupori SYSCTL_ULONG(_kern, OID_AUTO, base_address, CTLFLAG_RD,
423eb5a41cfSLeandro Lupori 	SYSCTL_NULL_ULONG_PTR, KERNBASE, "Kernel base address");
424eb5a41cfSLeandro Lupori SYSCTL_ULONG(_kern, OID_AUTO, relbase_address, CTLFLAG_RD,
425eb5a41cfSLeandro Lupori 	&kern_relbase, 0, "Kernel relocated base address");
426eb5a41cfSLeandro Lupori 
4271720979bSMarcel Moolenaar static void
428a4f67738SDoug Rabson link_elf_init(void* arg)
429a4f67738SDoug Rabson {
430de78ca7eSPeter Wemm 	Elf_Dyn *dp;
4310067051fSMarcel Moolenaar 	Elf_Addr *ctors_addrp;
4320067051fSMarcel Moolenaar 	Elf_Size *ctors_sizep;
433de78ca7eSPeter Wemm 	caddr_t modptr, baseptr, sizeptr;
434de78ca7eSPeter Wemm 	elf_file_t ef;
435fe20aaecSRyan Libby 	const char *modname;
436a4f67738SDoug Rabson 
437326e27d8SDoug Rabson 	linker_add_class(&link_elf_class);
438a4f67738SDoug Rabson 
439de78ca7eSPeter Wemm 	dp = (Elf_Dyn *)&_DYNAMIC;
440de78ca7eSPeter Wemm 	modname = NULL;
44167db8b23SPeter Wemm 	modptr = preload_search_by_type("elf" __XSTRING(__ELF_WORD_SIZE) " kernel");
44267db8b23SPeter Wemm 	if (modptr == NULL)
443de78ca7eSPeter Wemm 		modptr = preload_search_by_type("elf kernel");
444de78ca7eSPeter Wemm 	modname = (char *)preload_search_info(modptr, MODINFO_NAME);
445de78ca7eSPeter Wemm 	if (modname == NULL)
446de78ca7eSPeter Wemm 		modname = "kernel";
447326e27d8SDoug Rabson 	linker_kernel_file = linker_make_file(modname, &link_elf_class);
448a4f67738SDoug Rabson 	if (linker_kernel_file == NULL)
4492f22b3ffSMatthew D Fleming 		panic("%s: Can't create linker structures for kernel",
4502f22b3ffSMatthew D Fleming 		    __func__);
451326e27d8SDoug Rabson 
452326e27d8SDoug Rabson 	ef = (elf_file_t) linker_kernel_file;
45354823af2SPeter Wemm 	ef->preloaded = 1;
4549411e24dSBrandon Bergren #ifdef RELOCATABLE_KERNEL
45540b664f6SBrandon Bergren 	/* Compute relative displacement */
456c6014c73SNathan Whitehorn 	ef->address = (caddr_t) (__startkernel - KERNBASE);
457c6014c73SNathan Whitehorn #else
458326e27d8SDoug Rabson 	ef->address = 0;
459c6014c73SNathan Whitehorn #endif
460326e27d8SDoug Rabson #ifdef SPARSE_MAPPING
4611aa696baSMark Johnston 	ef->object = NULL;
462326e27d8SDoug Rabson #endif
463326e27d8SDoug Rabson 	ef->dynamic = dp;
464326e27d8SDoug Rabson 
4652f22b3ffSMatthew D Fleming 	if (dp != NULL)
466326e27d8SDoug Rabson 		parse_dynamic(ef);
4679411e24dSBrandon Bergren #ifdef RELOCATABLE_KERNEL
468ee900504SNathan Whitehorn 	linker_kernel_file->address = (caddr_t)__startkernel;
469ee900504SNathan Whitehorn 	linker_kernel_file->size = (intptr_t)(__endkernel - __startkernel);
470eb5a41cfSLeandro Lupori 	kern_relbase = (unsigned long)__startkernel;
471ee900504SNathan Whitehorn #else
472c6014c73SNathan Whitehorn 	linker_kernel_file->address += KERNBASE;
473d009ccfaSBruce Evans 	linker_kernel_file->size = -(intptr_t)linker_kernel_file->address;
474ee900504SNathan Whitehorn #endif
475de78ca7eSPeter Wemm 
4762f22b3ffSMatthew D Fleming 	if (modptr != NULL) {
4772d636ab0SPeter Wemm 		ef->modptr = modptr;
478de78ca7eSPeter Wemm 		baseptr = preload_search_info(modptr, MODINFO_ADDR);
4792f22b3ffSMatthew D Fleming 		if (baseptr != NULL)
480de78ca7eSPeter Wemm 			linker_kernel_file->address = *(caddr_t *)baseptr;
481de78ca7eSPeter Wemm 		sizeptr = preload_search_info(modptr, MODINFO_SIZE);
4822f22b3ffSMatthew D Fleming 		if (sizeptr != NULL)
483de78ca7eSPeter Wemm 			linker_kernel_file->size = *(size_t *)sizeptr;
4840067051fSMarcel Moolenaar 		ctors_addrp = (Elf_Addr *)preload_search_info(modptr,
4850067051fSMarcel Moolenaar 			MODINFO_METADATA | MODINFOMD_CTORS_ADDR);
4860067051fSMarcel Moolenaar 		ctors_sizep = (Elf_Size *)preload_search_info(modptr,
4870067051fSMarcel Moolenaar 			MODINFO_METADATA | MODINFOMD_CTORS_SIZE);
4880067051fSMarcel Moolenaar 		if (ctors_addrp != NULL && ctors_sizep != NULL) {
489853a17adSEnji Cooper 			linker_kernel_file->ctors_addr = ef->address +
4900067051fSMarcel Moolenaar 			    *ctors_addrp;
4910067051fSMarcel Moolenaar 			linker_kernel_file->ctors_size = *ctors_sizep;
4920067051fSMarcel Moolenaar 		}
493de78ca7eSPeter Wemm 	}
49454823af2SPeter Wemm 	(void)link_elf_preload_parse_symbols(ef);
495326e27d8SDoug Rabson 
496ecb01c64SMarcel Moolenaar #ifdef GDB
497c143d6c2SMarcel Moolenaar 	r_debug.r_map = NULL;
498326e27d8SDoug Rabson 	r_debug.r_brk = r_debug_state;
499326e27d8SDoug Rabson 	r_debug.r_state = RT_CONSISTENT;
500326e27d8SDoug Rabson #endif
501c143d6c2SMarcel Moolenaar 
502c143d6c2SMarcel Moolenaar 	(void)link_elf_link_common_finish(linker_kernel_file);
50359800afcSJohn Baldwin 	linker_kernel_file->flags |= LINKER_FILE_LINKED;
50447813f5dSMikolaj Golub 	TAILQ_INIT(&set_pcpu_list);
50547813f5dSMikolaj Golub #ifdef VIMAGE
50647813f5dSMikolaj Golub 	TAILQ_INIT(&set_vnet_list);
50747813f5dSMikolaj Golub #endif
508a4f67738SDoug Rabson }
509a4f67738SDoug Rabson 
510891cf3edSEd Maste SYSINIT(link_elf, SI_SUB_KLD, SI_ORDER_THIRD, link_elf_init, NULL);
511a4f67738SDoug Rabson 
512a4f67738SDoug Rabson static int
51354823af2SPeter Wemm link_elf_preload_parse_symbols(elf_file_t ef)
5142d636ab0SPeter Wemm {
5152d636ab0SPeter Wemm 	caddr_t pointer;
5162d636ab0SPeter Wemm 	caddr_t ssym, esym, base;
5172d636ab0SPeter Wemm 	caddr_t strtab;
5182d636ab0SPeter Wemm 	int strcnt;
5192d636ab0SPeter Wemm 	Elf_Sym *symtab;
5202d636ab0SPeter Wemm 	int symcnt;
5212d636ab0SPeter Wemm 
522ca65d5c7SPeter Wemm 	if (ef->modptr == NULL)
5232f22b3ffSMatthew D Fleming 		return (0);
5242f22b3ffSMatthew D Fleming 	pointer = preload_search_info(ef->modptr,
5252f22b3ffSMatthew D Fleming 	    MODINFO_METADATA | MODINFOMD_SSYM);
5262d636ab0SPeter Wemm 	if (pointer == NULL)
5272f22b3ffSMatthew D Fleming 		return (0);
5282d636ab0SPeter Wemm 	ssym = *(caddr_t *)pointer;
5292f22b3ffSMatthew D Fleming 	pointer = preload_search_info(ef->modptr,
5302f22b3ffSMatthew D Fleming 	    MODINFO_METADATA | MODINFOMD_ESYM);
5312d636ab0SPeter Wemm 	if (pointer == NULL)
5322f22b3ffSMatthew D Fleming 		return (0);
5332d636ab0SPeter Wemm 	esym = *(caddr_t *)pointer;
5342d636ab0SPeter Wemm 
5352d636ab0SPeter Wemm 	base = ssym;
5362d636ab0SPeter Wemm 
5372d636ab0SPeter Wemm 	symcnt = *(long *)base;
5382d636ab0SPeter Wemm 	base += sizeof(long);
5392d636ab0SPeter Wemm 	symtab = (Elf_Sym *)base;
5402d636ab0SPeter Wemm 	base += roundup(symcnt, sizeof(long));
5412d636ab0SPeter Wemm 
5422d636ab0SPeter Wemm 	if (base > esym || base < ssym) {
5432d636ab0SPeter Wemm 		printf("Symbols are corrupt!\n");
5442f22b3ffSMatthew D Fleming 		return (EINVAL);
5452d636ab0SPeter Wemm 	}
5462d636ab0SPeter Wemm 
5472d636ab0SPeter Wemm 	strcnt = *(long *)base;
5482d636ab0SPeter Wemm 	base += sizeof(long);
5492d636ab0SPeter Wemm 	strtab = base;
5502d636ab0SPeter Wemm 	base += roundup(strcnt, sizeof(long));
5512d636ab0SPeter Wemm 
5522d636ab0SPeter Wemm 	if (base > esym || base < ssym) {
5532d636ab0SPeter Wemm 		printf("Symbols are corrupt!\n");
5542f22b3ffSMatthew D Fleming 		return (EINVAL);
5552d636ab0SPeter Wemm 	}
5562d636ab0SPeter Wemm 
5572d636ab0SPeter Wemm 	ef->ddbsymtab = symtab;
5582d636ab0SPeter Wemm 	ef->ddbsymcnt = symcnt / sizeof(Elf_Sym);
5592d636ab0SPeter Wemm 	ef->ddbstrtab = strtab;
5602d636ab0SPeter Wemm 	ef->ddbstrcnt = strcnt;
5612d636ab0SPeter Wemm 
5622f22b3ffSMatthew D Fleming 	return (0);
5632d636ab0SPeter Wemm }
5642d636ab0SPeter Wemm 
5652d636ab0SPeter Wemm static int
566326e27d8SDoug Rabson parse_dynamic(elf_file_t ef)
567a4f67738SDoug Rabson {
568326e27d8SDoug Rabson 	Elf_Dyn *dp;
569fe3db7c7SDoug Rabson 	int plttype = DT_REL;
570a4f67738SDoug Rabson 
571a4f67738SDoug Rabson 	for (dp = ef->dynamic; dp->d_tag != DT_NULL; dp++) {
572a4f67738SDoug Rabson 		switch (dp->d_tag) {
573a4f67738SDoug Rabson 		case DT_HASH:
574a4f67738SDoug Rabson 		{
575a4f67738SDoug Rabson 			/* From src/libexec/rtld-elf/rtld.c */
5767e510298SJake Burkholder 			const Elf_Hashelt *hashtab = (const Elf_Hashelt *)
577a4f67738SDoug Rabson 			    (ef->address + dp->d_un.d_ptr);
578a4f67738SDoug Rabson 			ef->nbuckets = hashtab[0];
579a4f67738SDoug Rabson 			ef->nchains = hashtab[1];
580a4f67738SDoug Rabson 			ef->buckets = hashtab + 2;
581a4f67738SDoug Rabson 			ef->chains = ef->buckets + ef->nbuckets;
582a4f67738SDoug Rabson 			break;
583a4f67738SDoug Rabson 		}
584a4f67738SDoug Rabson 		case DT_STRTAB:
585fe3db7c7SDoug Rabson 			ef->strtab = (caddr_t) (ef->address + dp->d_un.d_ptr);
586a4f67738SDoug Rabson 			break;
5872d636ab0SPeter Wemm 		case DT_STRSZ:
5882d636ab0SPeter Wemm 			ef->strsz = dp->d_un.d_val;
5892d636ab0SPeter Wemm 			break;
590a4f67738SDoug Rabson 		case DT_SYMTAB:
591fe3db7c7SDoug Rabson 			ef->symtab = (Elf_Sym*) (ef->address + dp->d_un.d_ptr);
592a4f67738SDoug Rabson 			break;
593a4f67738SDoug Rabson 		case DT_SYMENT:
594a4f67738SDoug Rabson 			if (dp->d_un.d_val != sizeof(Elf_Sym))
5952f22b3ffSMatthew D Fleming 				return (ENOEXEC);
596fe3db7c7SDoug Rabson 			break;
597fe3db7c7SDoug Rabson 		case DT_PLTGOT:
598fe3db7c7SDoug Rabson 			ef->got = (Elf_Addr *) (ef->address + dp->d_un.d_ptr);
599fe3db7c7SDoug Rabson 			break;
600fe3db7c7SDoug Rabson 		case DT_REL:
601fe3db7c7SDoug Rabson 			ef->rel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr);
602fe3db7c7SDoug Rabson 			break;
603fe3db7c7SDoug Rabson 		case DT_RELSZ:
604fe3db7c7SDoug Rabson 			ef->relsize = dp->d_un.d_val;
605fe3db7c7SDoug Rabson 			break;
606fe3db7c7SDoug Rabson 		case DT_RELENT:
607fe3db7c7SDoug Rabson 			if (dp->d_un.d_val != sizeof(Elf_Rel))
6082f22b3ffSMatthew D Fleming 				return (ENOEXEC);
609fe3db7c7SDoug Rabson 			break;
610fe3db7c7SDoug Rabson 		case DT_JMPREL:
611fe3db7c7SDoug Rabson 			ef->pltrel = (const Elf_Rel *) (ef->address + dp->d_un.d_ptr);
612fe3db7c7SDoug Rabson 			break;
613fe3db7c7SDoug Rabson 		case DT_PLTRELSZ:
614fe3db7c7SDoug Rabson 			ef->pltrelsize = dp->d_un.d_val;
615fe3db7c7SDoug Rabson 			break;
616fe3db7c7SDoug Rabson 		case DT_RELA:
617fe3db7c7SDoug Rabson 			ef->rela = (const Elf_Rela *) (ef->address + dp->d_un.d_ptr);
618fe3db7c7SDoug Rabson 			break;
619fe3db7c7SDoug Rabson 		case DT_RELASZ:
620fe3db7c7SDoug Rabson 			ef->relasize = dp->d_un.d_val;
621fe3db7c7SDoug Rabson 			break;
622fe3db7c7SDoug Rabson 		case DT_RELAENT:
623fe3db7c7SDoug Rabson 			if (dp->d_un.d_val != sizeof(Elf_Rela))
6242f22b3ffSMatthew D Fleming 				return (ENOEXEC);
625fe3db7c7SDoug Rabson 			break;
626fe3db7c7SDoug Rabson 		case DT_PLTREL:
627fe3db7c7SDoug Rabson 			plttype = dp->d_un.d_val;
628fe3db7c7SDoug Rabson 			if (plttype != DT_REL && plttype != DT_RELA)
6292f22b3ffSMatthew D Fleming 				return (ENOEXEC);
630fe3db7c7SDoug Rabson 			break;
631ecb01c64SMarcel Moolenaar #ifdef GDB
632326e27d8SDoug Rabson 		case DT_DEBUG:
633326e27d8SDoug Rabson 			dp->d_un.d_ptr = (Elf_Addr)&r_debug;
634326e27d8SDoug Rabson 			break;
635326e27d8SDoug Rabson #endif
636a4f67738SDoug Rabson 		}
637a4f67738SDoug Rabson 	}
638fe3db7c7SDoug Rabson 
639fe3db7c7SDoug Rabson 	if (plttype == DT_RELA) {
640fe3db7c7SDoug Rabson 		ef->pltrela = (const Elf_Rela *)ef->pltrel;
641fe3db7c7SDoug Rabson 		ef->pltrel = NULL;
642fe3db7c7SDoug Rabson 		ef->pltrelasize = ef->pltrelsize;
643fe3db7c7SDoug Rabson 		ef->pltrelsize = 0;
644fe3db7c7SDoug Rabson 	}
645fe3db7c7SDoug Rabson 
6462d636ab0SPeter Wemm 	ef->ddbsymtab = ef->symtab;
6472d636ab0SPeter Wemm 	ef->ddbsymcnt = ef->nchains;
6482d636ab0SPeter Wemm 	ef->ddbstrtab = ef->strtab;
6492d636ab0SPeter Wemm 	ef->ddbstrcnt = ef->strsz;
6502d636ab0SPeter Wemm 
65130693808SBrandon Bergren 	return elf_cpu_parse_dynamic(ef->address, ef->dynamic);
652a4f67738SDoug Rabson }
653a4f67738SDoug Rabson 
6544c62bffeSBjoern A. Zeeb #define	LS_PADDING	0x90909090
655a4f67738SDoug Rabson static int
65650c202c5SJeff Roberson parse_dpcpu(elf_file_t ef)
65750c202c5SJeff Roberson {
6589ae7bc39SBjoern A. Zeeb 	int error, size;
6594c62bffeSBjoern A. Zeeb #if defined(__i386__)
6604c62bffeSBjoern A. Zeeb 	uint32_t pad;
6614c62bffeSBjoern A. Zeeb #endif
66250c202c5SJeff Roberson 
66350c202c5SJeff Roberson 	ef->pcpu_start = 0;
66450c202c5SJeff Roberson 	ef->pcpu_stop = 0;
66550c202c5SJeff Roberson 	error = link_elf_lookup_set(&ef->lf, "pcpu", (void ***)&ef->pcpu_start,
6669ae7bc39SBjoern A. Zeeb 	    (void ***)&ef->pcpu_stop, NULL);
66750c202c5SJeff Roberson 	/* Error just means there is no pcpu set to relocate. */
6682f22b3ffSMatthew D Fleming 	if (error != 0)
66950c202c5SJeff Roberson 		return (0);
6709ae7bc39SBjoern A. Zeeb 	size = (uintptr_t)ef->pcpu_stop - (uintptr_t)ef->pcpu_start;
6719ae7bc39SBjoern A. Zeeb 	/* Empty set? */
6729ae7bc39SBjoern A. Zeeb 	if (size < 1)
6739ae7bc39SBjoern A. Zeeb 		return (0);
6744c62bffeSBjoern A. Zeeb #if defined(__i386__)
6754c62bffeSBjoern A. Zeeb 	/* In case we do find __start/stop_set_ symbols double-check. */
6764c62bffeSBjoern A. Zeeb 	if (size < 4) {
6774c62bffeSBjoern A. Zeeb 		uprintf("Kernel module '%s' must be recompiled with "
6784c62bffeSBjoern A. Zeeb 		    "linker script\n", ef->lf.pathname);
6794c62bffeSBjoern A. Zeeb 		return (ENOEXEC);
6804c62bffeSBjoern A. Zeeb 	}
6814c62bffeSBjoern A. Zeeb 
6824c62bffeSBjoern A. Zeeb 	/* Padding from linker-script correct? */
6834c62bffeSBjoern A. Zeeb 	pad = *(uint32_t *)((uintptr_t)ef->pcpu_stop - sizeof(pad));
6844c62bffeSBjoern A. Zeeb 	if (pad != LS_PADDING) {
6854c62bffeSBjoern A. Zeeb 		uprintf("Kernel module '%s' must be recompiled with "
6864c62bffeSBjoern A. Zeeb 		    "linker script, invalid padding %#04x (%#04x)\n",
6874c62bffeSBjoern A. Zeeb 		    ef->lf.pathname, pad, LS_PADDING);
6884c62bffeSBjoern A. Zeeb 		return (ENOEXEC);
6894c62bffeSBjoern A. Zeeb 	}
6904c62bffeSBjoern A. Zeeb 	/* If we only have valid padding, nothing to do. */
6914c62bffeSBjoern A. Zeeb 	if (size == 4)
6924c62bffeSBjoern A. Zeeb 		return (0);
6934c62bffeSBjoern A. Zeeb #endif
69450c202c5SJeff Roberson 	/*
6952f22b3ffSMatthew D Fleming 	 * Allocate space in the primary pcpu area.  Copy in our
6962f22b3ffSMatthew D Fleming 	 * initialization from the data section and then initialize
6972f22b3ffSMatthew D Fleming 	 * all per-cpu storage from that.
69850c202c5SJeff Roberson 	 */
6999ae7bc39SBjoern A. Zeeb 	ef->pcpu_base = (Elf_Addr)(uintptr_t)dpcpu_alloc(size);
7000f823b64SBjoern A. Zeeb 	if (ef->pcpu_base == 0) {
7010f823b64SBjoern A. Zeeb 		printf("%s: pcpu module space is out of space; "
7020f823b64SBjoern A. Zeeb 		    "cannot allocate %d for %s\n",
7030f823b64SBjoern A. Zeeb 		    __func__, size, ef->lf.pathname);
70450c202c5SJeff Roberson 		return (ENOSPC);
7050f823b64SBjoern A. Zeeb 	}
7069ae7bc39SBjoern A. Zeeb 	memcpy((void *)ef->pcpu_base, (void *)ef->pcpu_start, size);
7079ae7bc39SBjoern A. Zeeb 	dpcpu_copy((void *)ef->pcpu_base, size);
70847813f5dSMikolaj Golub 	elf_set_add(&set_pcpu_list, ef->pcpu_start, ef->pcpu_stop,
70947813f5dSMikolaj Golub 	    ef->pcpu_base);
71050c202c5SJeff Roberson 
71150c202c5SJeff Roberson 	return (0);
71250c202c5SJeff Roberson }
71350c202c5SJeff Roberson 
714eddfbb76SRobert Watson #ifdef VIMAGE
715eddfbb76SRobert Watson static int
716eddfbb76SRobert Watson parse_vnet(elf_file_t ef)
717eddfbb76SRobert Watson {
7189ae7bc39SBjoern A. Zeeb 	int error, size;
7194c62bffeSBjoern A. Zeeb #if defined(__i386__)
7204c62bffeSBjoern A. Zeeb 	uint32_t pad;
7214c62bffeSBjoern A. Zeeb #endif
722eddfbb76SRobert Watson 
723eddfbb76SRobert Watson 	ef->vnet_start = 0;
724eddfbb76SRobert Watson 	ef->vnet_stop = 0;
725eddfbb76SRobert Watson 	error = link_elf_lookup_set(&ef->lf, "vnet", (void ***)&ef->vnet_start,
7269ae7bc39SBjoern A. Zeeb 	    (void ***)&ef->vnet_stop, NULL);
727eddfbb76SRobert Watson 	/* Error just means there is no vnet data set to relocate. */
7282f22b3ffSMatthew D Fleming 	if (error != 0)
729eddfbb76SRobert Watson 		return (0);
7309ae7bc39SBjoern A. Zeeb 	size = (uintptr_t)ef->vnet_stop - (uintptr_t)ef->vnet_start;
7319ae7bc39SBjoern A. Zeeb 	/* Empty set? */
7329ae7bc39SBjoern A. Zeeb 	if (size < 1)
7339ae7bc39SBjoern A. Zeeb 		return (0);
7344c62bffeSBjoern A. Zeeb #if defined(__i386__)
7354c62bffeSBjoern A. Zeeb 	/* In case we do find __start/stop_set_ symbols double-check. */
7364c62bffeSBjoern A. Zeeb 	if (size < 4) {
7374c62bffeSBjoern A. Zeeb 		uprintf("Kernel module '%s' must be recompiled with "
7384c62bffeSBjoern A. Zeeb 		    "linker script\n", ef->lf.pathname);
7394c62bffeSBjoern A. Zeeb 		return (ENOEXEC);
7404c62bffeSBjoern A. Zeeb 	}
7414c62bffeSBjoern A. Zeeb 
7424c62bffeSBjoern A. Zeeb 	/* Padding from linker-script correct? */
7434c62bffeSBjoern A. Zeeb 	pad = *(uint32_t *)((uintptr_t)ef->vnet_stop - sizeof(pad));
7444c62bffeSBjoern A. Zeeb 	if (pad != LS_PADDING) {
7454c62bffeSBjoern A. Zeeb 		uprintf("Kernel module '%s' must be recompiled with "
7464c62bffeSBjoern A. Zeeb 		    "linker script, invalid padding %#04x (%#04x)\n",
7474c62bffeSBjoern A. Zeeb 		    ef->lf.pathname, pad, LS_PADDING);
7484c62bffeSBjoern A. Zeeb 		return (ENOEXEC);
7494c62bffeSBjoern A. Zeeb 	}
7504c62bffeSBjoern A. Zeeb 	/* If we only have valid padding, nothing to do. */
7514c62bffeSBjoern A. Zeeb 	if (size == 4)
7524c62bffeSBjoern A. Zeeb 		return (0);
7534c62bffeSBjoern A. Zeeb #endif
754eddfbb76SRobert Watson 	/*
7552f22b3ffSMatthew D Fleming 	 * Allocate space in the primary vnet area.  Copy in our
7562f22b3ffSMatthew D Fleming 	 * initialization from the data section and then initialize
7572f22b3ffSMatthew D Fleming 	 * all per-vnet storage from that.
758eddfbb76SRobert Watson 	 */
7599ae7bc39SBjoern A. Zeeb 	ef->vnet_base = (Elf_Addr)(uintptr_t)vnet_data_alloc(size);
7600f823b64SBjoern A. Zeeb 	if (ef->vnet_base == 0) {
7610f823b64SBjoern A. Zeeb 		printf("%s: vnet module space is out of space; "
7620f823b64SBjoern A. Zeeb 		    "cannot allocate %d for %s\n",
7630f823b64SBjoern A. Zeeb 		    __func__, size, ef->lf.pathname);
764eddfbb76SRobert Watson 		return (ENOSPC);
7650f823b64SBjoern A. Zeeb 	}
7669ae7bc39SBjoern A. Zeeb 	memcpy((void *)ef->vnet_base, (void *)ef->vnet_start, size);
7679ae7bc39SBjoern A. Zeeb 	vnet_data_copy((void *)ef->vnet_base, size);
76847813f5dSMikolaj Golub 	elf_set_add(&set_vnet_list, ef->vnet_start, ef->vnet_stop,
76947813f5dSMikolaj Golub 	    ef->vnet_base);
770eddfbb76SRobert Watson 
771eddfbb76SRobert Watson 	return (0);
772eddfbb76SRobert Watson }
773eddfbb76SRobert Watson #endif
7744c62bffeSBjoern A. Zeeb #undef LS_PADDING
775eddfbb76SRobert Watson 
776f822c9e2SMark Johnston /*
777f822c9e2SMark Johnston  * Apply the specified protection to the loadable segments of a preloaded linker
778f822c9e2SMark Johnston  * file.
779f822c9e2SMark Johnston  */
78050c202c5SJeff Roberson static int
781f822c9e2SMark Johnston preload_protect(elf_file_t ef, vm_prot_t prot)
782f822c9e2SMark Johnston {
783a85ce4adSAndrew Turner #if defined(__aarch64__) || defined(__amd64__)
784f822c9e2SMark Johnston 	Elf_Ehdr *hdr;
785f822c9e2SMark Johnston 	Elf_Phdr *phdr, *phlimit;
786f822c9e2SMark Johnston 	vm_prot_t nprot;
787f822c9e2SMark Johnston 	int error;
788f822c9e2SMark Johnston 
789f822c9e2SMark Johnston 	error = 0;
790f822c9e2SMark Johnston 	hdr = (Elf_Ehdr *)ef->address;
791f822c9e2SMark Johnston 	phdr = (Elf_Phdr *)(ef->address + hdr->e_phoff);
792f822c9e2SMark Johnston 	phlimit = phdr + hdr->e_phnum;
793f822c9e2SMark Johnston 	for (; phdr < phlimit; phdr++) {
794f822c9e2SMark Johnston 		if (phdr->p_type != PT_LOAD)
795f822c9e2SMark Johnston 			continue;
796f822c9e2SMark Johnston 
797f822c9e2SMark Johnston 		nprot = prot | VM_PROT_READ;
798f822c9e2SMark Johnston 		if ((phdr->p_flags & PF_W) != 0)
799f822c9e2SMark Johnston 			nprot |= VM_PROT_WRITE;
800f822c9e2SMark Johnston 		if ((phdr->p_flags & PF_X) != 0)
801f822c9e2SMark Johnston 			nprot |= VM_PROT_EXECUTE;
802f822c9e2SMark Johnston 		error = pmap_change_prot((vm_offset_t)ef->address +
803f822c9e2SMark Johnston 		    phdr->p_vaddr, round_page(phdr->p_memsz), nprot);
804f822c9e2SMark Johnston 		if (error != 0)
805f822c9e2SMark Johnston 			break;
806f822c9e2SMark Johnston 	}
807f822c9e2SMark Johnston 	return (error);
808f822c9e2SMark Johnston #else
809f822c9e2SMark Johnston 	return (0);
810f822c9e2SMark Johnston #endif
811f822c9e2SMark Johnston }
812f822c9e2SMark Johnston 
813b19c9deaSIan Lepore #ifdef __arm__
814b19c9deaSIan Lepore /*
815b19c9deaSIan Lepore  * Locate the ARM exception/unwind table info for DDB and stack(9) use by
816b19c9deaSIan Lepore  * searching for the section header that describes it.  There may be no unwind
817b19c9deaSIan Lepore  * info, for example in a module containing only data.
818b19c9deaSIan Lepore  */
819b19c9deaSIan Lepore static void
820b19c9deaSIan Lepore link_elf_locate_exidx(linker_file_t lf, Elf_Shdr *shdr, int nhdr)
821b19c9deaSIan Lepore {
822b19c9deaSIan Lepore 	int i;
823b19c9deaSIan Lepore 
824b19c9deaSIan Lepore 	for (i = 0; i < nhdr; i++) {
825b19c9deaSIan Lepore 		if (shdr[i].sh_type == SHT_ARM_EXIDX) {
826b19c9deaSIan Lepore 			lf->exidx_addr = shdr[i].sh_addr + lf->address;
827b19c9deaSIan Lepore 			lf->exidx_size = shdr[i].sh_size;
828b19c9deaSIan Lepore 			break;
829b19c9deaSIan Lepore 		}
830b19c9deaSIan Lepore 	}
831b19c9deaSIan Lepore }
832b19c9deaSIan Lepore 
833b19c9deaSIan Lepore /*
834b19c9deaSIan Lepore  * Locate the section headers metadata in a preloaded module, then use it to
835b19c9deaSIan Lepore  * locate the exception/unwind table in the module.  The size of the metadata
836b19c9deaSIan Lepore  * block is stored in a uint32 word immediately before the data itself, and a
837b19c9deaSIan Lepore  * comment in preload_search_info() says it is safe to rely on that.
838b19c9deaSIan Lepore  */
839b19c9deaSIan Lepore static void
840b19c9deaSIan Lepore link_elf_locate_exidx_preload(struct linker_file *lf, caddr_t modptr)
841b19c9deaSIan Lepore {
842b19c9deaSIan Lepore 	uint32_t *modinfo;
843b19c9deaSIan Lepore 	Elf_Shdr *shdr;
844b19c9deaSIan Lepore 	uint32_t  nhdr;
845b19c9deaSIan Lepore 
846b19c9deaSIan Lepore 	modinfo = (uint32_t *)preload_search_info(modptr,
847b19c9deaSIan Lepore 	    MODINFO_METADATA | MODINFOMD_SHDR);
848b19c9deaSIan Lepore 	if (modinfo != NULL) {
849b19c9deaSIan Lepore 		shdr = (Elf_Shdr *)modinfo;
850b19c9deaSIan Lepore 		nhdr = modinfo[-1] / sizeof(Elf_Shdr);
851b19c9deaSIan Lepore 		link_elf_locate_exidx(lf, shdr, nhdr);
852b19c9deaSIan Lepore 	}
853b19c9deaSIan Lepore }
854b19c9deaSIan Lepore 
855b19c9deaSIan Lepore #endif /* __arm__ */
856b19c9deaSIan Lepore 
857f822c9e2SMark Johnston static int
858f822c9e2SMark Johnston link_elf_link_preload(linker_class_t cls, const char *filename,
859f822c9e2SMark Johnston     linker_file_t *result)
860de78ca7eSPeter Wemm {
8610067051fSMarcel Moolenaar 	Elf_Addr *ctors_addrp;
8620067051fSMarcel Moolenaar 	Elf_Size *ctors_sizep;
863de78ca7eSPeter Wemm 	caddr_t modptr, baseptr, sizeptr, dynptr;
864de78ca7eSPeter Wemm 	char *type;
865de78ca7eSPeter Wemm 	elf_file_t ef;
866de78ca7eSPeter Wemm 	linker_file_t lf;
867de78ca7eSPeter Wemm 	int error;
868de78ca7eSPeter Wemm 	vm_offset_t dp;
869de78ca7eSPeter Wemm 
87054823af2SPeter Wemm 	/* Look to see if we have the file preloaded */
871de78ca7eSPeter Wemm 	modptr = preload_search_by_name(filename);
872de78ca7eSPeter Wemm 	if (modptr == NULL)
8732f22b3ffSMatthew D Fleming 		return (ENOENT);
874de78ca7eSPeter Wemm 
875de78ca7eSPeter Wemm 	type = (char *)preload_search_info(modptr, MODINFO_TYPE);
876de78ca7eSPeter Wemm 	baseptr = preload_search_info(modptr, MODINFO_ADDR);
877de78ca7eSPeter Wemm 	sizeptr = preload_search_info(modptr, MODINFO_SIZE);
8782f22b3ffSMatthew D Fleming 	dynptr = preload_search_info(modptr,
8792f22b3ffSMatthew D Fleming 	    MODINFO_METADATA | MODINFOMD_DYNAMIC);
88067db8b23SPeter Wemm 	if (type == NULL ||
88167db8b23SPeter Wemm 	    (strcmp(type, "elf" __XSTRING(__ELF_WORD_SIZE) " module") != 0 &&
88267db8b23SPeter Wemm 	     strcmp(type, "elf module") != 0))
883de78ca7eSPeter Wemm 		return (EFTYPE);
884de78ca7eSPeter Wemm 	if (baseptr == NULL || sizeptr == NULL || dynptr == NULL)
885de78ca7eSPeter Wemm 		return (EINVAL);
886de78ca7eSPeter Wemm 
887326e27d8SDoug Rabson 	lf = linker_make_file(filename, &link_elf_class);
8882f22b3ffSMatthew D Fleming 	if (lf == NULL)
8892f22b3ffSMatthew D Fleming 		return (ENOMEM);
890326e27d8SDoug Rabson 
891326e27d8SDoug Rabson 	ef = (elf_file_t) lf;
892326e27d8SDoug Rabson 	ef->preloaded = 1;
893ca65d5c7SPeter Wemm 	ef->modptr = modptr;
894de78ca7eSPeter Wemm 	ef->address = *(caddr_t *)baseptr;
895de78ca7eSPeter Wemm #ifdef SPARSE_MAPPING
8961aa696baSMark Johnston 	ef->object = NULL;
897de78ca7eSPeter Wemm #endif
898de78ca7eSPeter Wemm 	dp = (vm_offset_t)ef->address + *(vm_offset_t *)dynptr;
899de78ca7eSPeter Wemm 	ef->dynamic = (Elf_Dyn *)dp;
900de78ca7eSPeter Wemm 	lf->address = ef->address;
901de78ca7eSPeter Wemm 	lf->size = *(size_t *)sizeptr;
902de78ca7eSPeter Wemm 
9030067051fSMarcel Moolenaar 	ctors_addrp = (Elf_Addr *)preload_search_info(modptr,
9040067051fSMarcel Moolenaar 	    MODINFO_METADATA | MODINFOMD_CTORS_ADDR);
9050067051fSMarcel Moolenaar 	ctors_sizep = (Elf_Size *)preload_search_info(modptr,
9060067051fSMarcel Moolenaar 	    MODINFO_METADATA | MODINFOMD_CTORS_SIZE);
9070067051fSMarcel Moolenaar 	if (ctors_addrp != NULL && ctors_sizep != NULL) {
9080067051fSMarcel Moolenaar 		lf->ctors_addr = ef->address + *ctors_addrp;
9090067051fSMarcel Moolenaar 		lf->ctors_size = *ctors_sizep;
9100067051fSMarcel Moolenaar 	}
9110067051fSMarcel Moolenaar 
912b19c9deaSIan Lepore #ifdef __arm__
913b19c9deaSIan Lepore 	link_elf_locate_exidx_preload(lf, modptr);
914b19c9deaSIan Lepore #endif
915b19c9deaSIan Lepore 
916326e27d8SDoug Rabson 	error = parse_dynamic(ef);
91750c202c5SJeff Roberson 	if (error == 0)
91850c202c5SJeff Roberson 		error = parse_dpcpu(ef);
919eddfbb76SRobert Watson #ifdef VIMAGE
920eddfbb76SRobert Watson 	if (error == 0)
921eddfbb76SRobert Watson 		error = parse_vnet(ef);
922eddfbb76SRobert Watson #endif
923f822c9e2SMark Johnston 	if (error == 0)
924f822c9e2SMark Johnston 		error = preload_protect(ef, VM_PROT_ALL);
9252f22b3ffSMatthew D Fleming 	if (error != 0) {
92665a311fcSPoul-Henning Kamp 		linker_file_unload(lf, LINKER_UNLOAD_FORCE);
9272f22b3ffSMatthew D Fleming 		return (error);
928de78ca7eSPeter Wemm 	}
9297251b4bfSJake Burkholder 	link_elf_reloc_local(lf);
930de78ca7eSPeter Wemm 	*result = lf;
931de78ca7eSPeter Wemm 	return (0);
932de78ca7eSPeter Wemm }
933de78ca7eSPeter Wemm 
934de78ca7eSPeter Wemm static int
93554823af2SPeter Wemm link_elf_link_preload_finish(linker_file_t lf)
93654823af2SPeter Wemm {
93754823af2SPeter Wemm 	elf_file_t ef;
93854823af2SPeter Wemm 	int error;
93954823af2SPeter Wemm 
94054823af2SPeter Wemm 	ef = (elf_file_t) lf;
94154823af2SPeter Wemm 	error = relocate_file(ef);
942f822c9e2SMark Johnston 	if (error == 0)
943f822c9e2SMark Johnston 		error = preload_protect(ef, VM_PROT_NONE);
9442f22b3ffSMatthew D Fleming 	if (error != 0)
9452f22b3ffSMatthew D Fleming 		return (error);
94654823af2SPeter Wemm 	(void)link_elf_preload_parse_symbols(ef);
94754823af2SPeter Wemm 
948c143d6c2SMarcel Moolenaar 	return (link_elf_link_common_finish(lf));
94954823af2SPeter Wemm }
95054823af2SPeter Wemm 
95154823af2SPeter Wemm static int
952c143d6c2SMarcel Moolenaar link_elf_load_file(linker_class_t cls, const char* filename,
953c143d6c2SMarcel Moolenaar     linker_file_t* result)
954a4f67738SDoug Rabson {
955a4f67738SDoug Rabson 	struct nameidata nd;
956b40ce416SJulian Elischer 	struct thread* td = curthread;	/* XXX */
957caab6e90SPeter Wemm 	Elf_Ehdr *hdr;
9581aa696baSMark Johnston 	caddr_t firstpage, segbase;
959fe3db7c7SDoug Rabson 	int nbytes, i;
960fe3db7c7SDoug Rabson 	Elf_Phdr *phdr;
961fe3db7c7SDoug Rabson 	Elf_Phdr *phlimit;
9621a330eb0SPeter Wemm 	Elf_Phdr *segs[MAXSEGS];
963fe3db7c7SDoug Rabson 	int nsegs;
964fe3db7c7SDoug Rabson 	Elf_Phdr *phdyn;
965fe3db7c7SDoug Rabson 	caddr_t mapbase;
966fe3db7c7SDoug Rabson 	size_t mapsize;
967fe3db7c7SDoug Rabson 	Elf_Addr base_vaddr;
968fe3db7c7SDoug Rabson 	Elf_Addr base_vlimit;
969a4f67738SDoug Rabson 	int error = 0;
970526d0bd5SKonstantin Belousov 	ssize_t resid;
971526d0bd5SKonstantin Belousov 	int flags;
972a4f67738SDoug Rabson 	elf_file_t ef;
973a4f67738SDoug Rabson 	linker_file_t lf;
974ca65d5c7SPeter Wemm 	Elf_Shdr *shdr;
975ca65d5c7SPeter Wemm 	int symtabindex;
976ca65d5c7SPeter Wemm 	int symstrindex;
9770067051fSMarcel Moolenaar 	int shstrindex;
978ca65d5c7SPeter Wemm 	int symcnt;
979ca65d5c7SPeter Wemm 	int strcnt;
9800067051fSMarcel Moolenaar 	char *shstrs;
981ca65d5c7SPeter Wemm 
982ca65d5c7SPeter Wemm 	shdr = NULL;
983ca65d5c7SPeter Wemm 	lf = NULL;
9840067051fSMarcel Moolenaar 	shstrs = NULL;
985a4f67738SDoug Rabson 
9867e1d3eefSMateusz Guzik 	NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, filename);
987e6796b67SKirk McKusick 	flags = FREAD;
9889e223287SKonstantin Belousov 	error = vn_open(&nd, &flags, 0, NULL);
9892f22b3ffSMatthew D Fleming 	if (error != 0)
9902f22b3ffSMatthew D Fleming 		return (error);
991762e6b85SEivind Eklund 	NDFREE(&nd, NDF_ONLY_PNBUF);
9921f49b573SRuslan Ermilov 	if (nd.ni_vp->v_type != VREG) {
9931f49b573SRuslan Ermilov 		error = ENOEXEC;
9941f49b573SRuslan Ermilov 		firstpage = NULL;
9951f49b573SRuslan Ermilov 		goto out;
9961f49b573SRuslan Ermilov 	}
997a3df768bSRobert Watson #ifdef MAC
99830d239bcSRobert Watson 	error = mac_kld_check_load(curthread->td_ucred, nd.ni_vp);
9992f22b3ffSMatthew D Fleming 	if (error != 0) {
1000a3df768bSRobert Watson 		firstpage = NULL;
1001a3df768bSRobert Watson 		goto out;
1002a3df768bSRobert Watson 	}
1003a3df768bSRobert Watson #endif
1004a4f67738SDoug Rabson 
1005a4f67738SDoug Rabson 	/*
1006fe3db7c7SDoug Rabson 	 * Read the elf header from the file.
1007a4f67738SDoug Rabson 	 */
1008a163d034SWarner Losh 	firstpage = malloc(PAGE_SIZE, M_LINKER, M_WAITOK);
1009caab6e90SPeter Wemm 	hdr = (Elf_Ehdr *)firstpage;
1010caab6e90SPeter Wemm 	error = vn_rdwr(UIO_READ, nd.ni_vp, firstpage, PAGE_SIZE, 0,
10119ca43589SRobert Watson 	    UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
10129ca43589SRobert Watson 	    &resid, td);
1013caab6e90SPeter Wemm 	nbytes = PAGE_SIZE - resid;
10142f22b3ffSMatthew D Fleming 	if (error != 0)
1015a4f67738SDoug Rabson 		goto out;
1016a4f67738SDoug Rabson 
1017caab6e90SPeter Wemm 	if (!IS_ELF(*hdr)) {
1018fe3db7c7SDoug Rabson 		error = ENOEXEC;
1019a4f67738SDoug Rabson 		goto out;
1020fe3db7c7SDoug Rabson 	}
1021fe3db7c7SDoug Rabson 
10222f22b3ffSMatthew D Fleming 	if (hdr->e_ident[EI_CLASS] != ELF_TARG_CLASS ||
10232f22b3ffSMatthew D Fleming 	    hdr->e_ident[EI_DATA] != ELF_TARG_DATA) {
1024552f9f63SEdwin Groothuis 		link_elf_error(filename, "Unsupported file layout");
1025fe3db7c7SDoug Rabson 		error = ENOEXEC;
1026fe3db7c7SDoug Rabson 		goto out;
1027fe3db7c7SDoug Rabson 	}
10282f22b3ffSMatthew D Fleming 	if (hdr->e_ident[EI_VERSION] != EV_CURRENT ||
10292f22b3ffSMatthew D Fleming 	    hdr->e_version != EV_CURRENT) {
1030552f9f63SEdwin Groothuis 		link_elf_error(filename, "Unsupported file version");
1031fe3db7c7SDoug Rabson 		error = ENOEXEC;
1032fe3db7c7SDoug Rabson 		goto out;
1033fe3db7c7SDoug Rabson 	}
1034caab6e90SPeter Wemm 	if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) {
1035a1d7ce03SAttilio Rao 		error = ENOSYS;
1036fe3db7c7SDoug Rabson 		goto out;
1037fe3db7c7SDoug Rabson 	}
1038caab6e90SPeter Wemm 	if (hdr->e_machine != ELF_TARG_MACH) {
1039552f9f63SEdwin Groothuis 		link_elf_error(filename, "Unsupported machine");
1040fe3db7c7SDoug Rabson 		error = ENOEXEC;
1041fe3db7c7SDoug Rabson 		goto out;
1042fe3db7c7SDoug Rabson 	}
1043a4f67738SDoug Rabson 
1044a4f67738SDoug Rabson 	/*
10452f22b3ffSMatthew D Fleming 	 * We rely on the program header being in the first page.
10462f22b3ffSMatthew D Fleming 	 * This is not strictly required by the ABI specification, but
10472f22b3ffSMatthew D Fleming 	 * it seems to always true in practice.  And, it simplifies
10482f22b3ffSMatthew D Fleming 	 * things considerably.
1049a4f67738SDoug Rabson 	 */
1050caab6e90SPeter Wemm 	if (!((hdr->e_phentsize == sizeof(Elf_Phdr)) &&
1051caab6e90SPeter Wemm 	      (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= PAGE_SIZE) &&
1052caab6e90SPeter Wemm 	      (hdr->e_phoff + hdr->e_phnum*sizeof(Elf_Phdr) <= nbytes)))
1053552f9f63SEdwin Groothuis 		link_elf_error(filename, "Unreadable program headers");
1054fe3db7c7SDoug Rabson 
1055fe3db7c7SDoug Rabson 	/*
1056fe3db7c7SDoug Rabson 	 * Scan the program header entries, and save key information.
1057fe3db7c7SDoug Rabson 	 *
1058fe3db7c7SDoug Rabson 	 * We rely on there being exactly two load segments, text and data,
1059fe3db7c7SDoug Rabson 	 * in that order.
1060fe3db7c7SDoug Rabson 	 */
1061caab6e90SPeter Wemm 	phdr = (Elf_Phdr *) (firstpage + hdr->e_phoff);
1062caab6e90SPeter Wemm 	phlimit = phdr + hdr->e_phnum;
1063fe3db7c7SDoug Rabson 	nsegs = 0;
1064fe3db7c7SDoug Rabson 	phdyn = NULL;
1065fe3db7c7SDoug Rabson 	while (phdr < phlimit) {
1066fe3db7c7SDoug Rabson 		switch (phdr->p_type) {
1067fe3db7c7SDoug Rabson 		case PT_LOAD:
10681a330eb0SPeter Wemm 			if (nsegs == MAXSEGS) {
1069552f9f63SEdwin Groothuis 				link_elf_error(filename, "Too many sections");
1070fe3db7c7SDoug Rabson 				error = ENOEXEC;
1071fe3db7c7SDoug Rabson 				goto out;
1072fe3db7c7SDoug Rabson 			}
107387b1831fSPoul-Henning Kamp 			/*
107487b1831fSPoul-Henning Kamp 			 * XXX: We just trust they come in right order ??
107587b1831fSPoul-Henning Kamp 			 */
1076fe3db7c7SDoug Rabson 			segs[nsegs] = phdr;
1077fe3db7c7SDoug Rabson 			++nsegs;
1078fe3db7c7SDoug Rabson 			break;
1079fe3db7c7SDoug Rabson 
1080fe3db7c7SDoug Rabson 		case PT_DYNAMIC:
1081fe3db7c7SDoug Rabson 			phdyn = phdr;
1082fe3db7c7SDoug Rabson 			break;
10839548091bSBoris Popov 
10849548091bSBoris Popov 		case PT_INTERP:
1085a1d7ce03SAttilio Rao 			error = ENOSYS;
10869548091bSBoris Popov 			goto out;
1087fe3db7c7SDoug Rabson 		}
1088fe3db7c7SDoug Rabson 
1089fe3db7c7SDoug Rabson 		++phdr;
1090fe3db7c7SDoug Rabson 	}
1091fe3db7c7SDoug Rabson 	if (phdyn == NULL) {
1092552f9f63SEdwin Groothuis 		link_elf_error(filename, "Object is not dynamically-linked");
1093fe3db7c7SDoug Rabson 		error = ENOEXEC;
1094fe3db7c7SDoug Rabson 		goto out;
1095fe3db7c7SDoug Rabson 	}
10961a330eb0SPeter Wemm 	if (nsegs == 0) {
1097552f9f63SEdwin Groothuis 		link_elf_error(filename, "No sections");
109887b1831fSPoul-Henning Kamp 		error = ENOEXEC;
109987b1831fSPoul-Henning Kamp 		goto out;
110087b1831fSPoul-Henning Kamp 	}
1101fe3db7c7SDoug Rabson 
1102fe3db7c7SDoug Rabson 	/*
11032f22b3ffSMatthew D Fleming 	 * Allocate the entire address space of the object, to stake
11042f22b3ffSMatthew D Fleming 	 * out our contiguous region, and to establish the base
11052f22b3ffSMatthew D Fleming 	 * address for relocation.
1106fe3db7c7SDoug Rabson 	 */
1107fe3db7c7SDoug Rabson 	base_vaddr = trunc_page(segs[0]->p_vaddr);
11081a330eb0SPeter Wemm 	base_vlimit = round_page(segs[nsegs - 1]->p_vaddr +
11091a330eb0SPeter Wemm 	    segs[nsegs - 1]->p_memsz);
1110fe3db7c7SDoug Rabson 	mapsize = base_vlimit - base_vaddr;
1111fe3db7c7SDoug Rabson 
1112326e27d8SDoug Rabson 	lf = linker_make_file(filename, &link_elf_class);
11132f22b3ffSMatthew D Fleming 	if (lf == NULL) {
1114326e27d8SDoug Rabson 		error = ENOMEM;
1115326e27d8SDoug Rabson 		goto out;
1116326e27d8SDoug Rabson 	}
1117326e27d8SDoug Rabson 
1118326e27d8SDoug Rabson 	ef = (elf_file_t) lf;
1119fe3db7c7SDoug Rabson #ifdef SPARSE_MAPPING
1120fbf2a778SKonstantin Belousov 	ef->object = vm_pager_allocate(OBJT_PHYS, NULL, mapsize, VM_PROT_ALL,
1121fbf2a778SKonstantin Belousov 	    0, thread0.td_ucred);
1122fe3db7c7SDoug Rabson 	if (ef->object == NULL) {
1123fe3db7c7SDoug Rabson 		error = ENOMEM;
1124fe3db7c7SDoug Rabson 		goto out;
1125fe3db7c7SDoug Rabson 	}
11261aa696baSMark Johnston #ifdef __amd64__
11271aa696baSMark Johnston 	mapbase = (caddr_t)KERNBASE;
11281aa696baSMark Johnston #else
11291aa696baSMark Johnston 	mapbase = (caddr_t)vm_map_min(kernel_map);
11301aa696baSMark Johnston #endif
11311aa696baSMark Johnston 	/*
11321aa696baSMark Johnston 	 * Mapping protections are downgraded after relocation processing.
11331aa696baSMark Johnston 	 */
1134fe3db7c7SDoug Rabson 	error = vm_map_find(kernel_map, ef->object, 0,
11351aa696baSMark Johnston 	    (vm_offset_t *)&mapbase, mapsize, 0, VMFS_OPTIMAL_SPACE,
1136fe3db7c7SDoug Rabson 	    VM_PROT_ALL, VM_PROT_ALL, 0);
11372f22b3ffSMatthew D Fleming 	if (error != 0) {
1138fe3db7c7SDoug Rabson 		vm_object_deallocate(ef->object);
11391aa696baSMark Johnston 		ef->object = NULL;
1140fe3db7c7SDoug Rabson 		goto out;
1141fe3db7c7SDoug Rabson 	}
1142fe3db7c7SDoug Rabson #else
114382c174a3SMateusz Guzik 	mapbase = malloc_exec(mapsize, M_LINKER, M_WAITOK);
1144fe3db7c7SDoug Rabson #endif
11451aa696baSMark Johnston 	ef->address = mapbase;
1146a4f67738SDoug Rabson 
1147a4f67738SDoug Rabson 	/*
1148a4f67738SDoug Rabson 	 * Read the text and data sections and zero the bss.
1149a4f67738SDoug Rabson 	 */
11501a330eb0SPeter Wemm 	for (i = 0; i < nsegs; i++) {
11511aa696baSMark Johnston 		segbase = mapbase + segs[i]->p_vaddr - base_vaddr;
11521aa696baSMark Johnston 
11531aa696baSMark Johnston #ifdef SPARSE_MAPPING
11541aa696baSMark Johnston 		/*
11551aa696baSMark Johnston 		 * Consecutive segments may have different mapping permissions,
11561aa696baSMark Johnston 		 * so be strict and verify that their mappings do not overlap.
11571aa696baSMark Johnston 		 */
11581aa696baSMark Johnston 		if (((vm_offset_t)segbase & PAGE_MASK) != 0) {
11591aa696baSMark Johnston 			error = EINVAL;
11601aa696baSMark Johnston 			goto out;
11611aa696baSMark Johnston 		}
11621aa696baSMark Johnston 
11631aa696baSMark Johnston 		error = vm_map_wire(kernel_map,
11641aa696baSMark Johnston 		    (vm_offset_t)segbase,
11651aa696baSMark Johnston 		    (vm_offset_t)segbase + round_page(segs[i]->p_memsz),
11661aa696baSMark Johnston 		    VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES);
11671aa696baSMark Johnston 		if (error != KERN_SUCCESS) {
11681aa696baSMark Johnston 			error = ENOMEM;
11691aa696baSMark Johnston 			goto out;
11701aa696baSMark Johnston 		}
11711aa696baSMark Johnston #endif
11721aa696baSMark Johnston 
1173fe3db7c7SDoug Rabson 		error = vn_rdwr(UIO_READ, nd.ni_vp,
1174fe3db7c7SDoug Rabson 		    segbase, segs[i]->p_filesz, segs[i]->p_offset,
11759ca43589SRobert Watson 		    UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
11769ca43589SRobert Watson 		    &resid, td);
11772f22b3ffSMatthew D Fleming 		if (error != 0)
1178a4f67738SDoug Rabson 			goto out;
1179fe3db7c7SDoug Rabson 		bzero(segbase + segs[i]->p_filesz,
1180fe3db7c7SDoug Rabson 		    segs[i]->p_memsz - segs[i]->p_filesz);
1181fe3db7c7SDoug Rabson 	}
1182fe3db7c7SDoug Rabson 
1183f99502a4SBrian Feldman #ifdef GPROF
1184f99502a4SBrian Feldman 	/* Update profiling information with the new text segment. */
118570f37788SJohn Baldwin 	mtx_lock(&Giant);
1186853a17adSEnji Cooper 	kmupetext((uintfptr_t)(mapbase + segs[0]->p_vaddr - base_vaddr +
1187f99502a4SBrian Feldman 	    segs[0]->p_memsz));
118870f37788SJohn Baldwin 	mtx_unlock(&Giant);
1189f99502a4SBrian Feldman #endif
1190f99502a4SBrian Feldman 
1191326e27d8SDoug Rabson 	ef->dynamic = (Elf_Dyn *) (mapbase + phdyn->p_vaddr - base_vaddr);
1192a4f67738SDoug Rabson 
1193a4f67738SDoug Rabson 	lf->address = ef->address;
1194fe3db7c7SDoug Rabson 	lf->size = mapsize;
1195a4f67738SDoug Rabson 
1196326e27d8SDoug Rabson 	error = parse_dynamic(ef);
11972f22b3ffSMatthew D Fleming 	if (error != 0)
1198de78ca7eSPeter Wemm 		goto out;
119950c202c5SJeff Roberson 	error = parse_dpcpu(ef);
12002f22b3ffSMatthew D Fleming 	if (error != 0)
120150c202c5SJeff Roberson 		goto out;
1202eddfbb76SRobert Watson #ifdef VIMAGE
1203eddfbb76SRobert Watson 	error = parse_vnet(ef);
12042f22b3ffSMatthew D Fleming 	if (error != 0)
1205eddfbb76SRobert Watson 		goto out;
1206eddfbb76SRobert Watson #endif
12077251b4bfSJake Burkholder 	link_elf_reloc_local(lf);
12087251b4bfSJake Burkholder 
1209b249ce48SMateusz Guzik 	VOP_UNLOCK(nd.ni_vp);
12107b9716baSIan Dowse 	error = linker_load_dependencies(lf);
12114f7afc20SKonstantin Belousov 	vn_lock(nd.ni_vp, LK_EXCLUSIVE | LK_RETRY);
12122f22b3ffSMatthew D Fleming 	if (error != 0)
1213de78ca7eSPeter Wemm 		goto out;
1214326e27d8SDoug Rabson 	error = relocate_file(ef);
12152f22b3ffSMatthew D Fleming 	if (error != 0)
1216ca65d5c7SPeter Wemm 		goto out;
1217ca65d5c7SPeter Wemm 
12181aa696baSMark Johnston #ifdef SPARSE_MAPPING
12191aa696baSMark Johnston 	/*
12201aa696baSMark Johnston 	 * Downgrade permissions on text segment mappings now that relocation
12211aa696baSMark Johnston 	 * processing is complete.  Restrict permissions on read-only segments.
12221aa696baSMark Johnston 	 */
12231aa696baSMark Johnston 	for (i = 0; i < nsegs; i++) {
12241aa696baSMark Johnston 		vm_prot_t prot;
12251aa696baSMark Johnston 
12261aa696baSMark Johnston 		if (segs[i]->p_type != PT_LOAD)
12271aa696baSMark Johnston 			continue;
12281aa696baSMark Johnston 
12291aa696baSMark Johnston 		prot = VM_PROT_READ;
12301aa696baSMark Johnston 		if ((segs[i]->p_flags & PF_W) != 0)
12311aa696baSMark Johnston 			prot |= VM_PROT_WRITE;
12321aa696baSMark Johnston 		if ((segs[i]->p_flags & PF_X) != 0)
12331aa696baSMark Johnston 			prot |= VM_PROT_EXECUTE;
12341aa696baSMark Johnston 		segbase = mapbase + segs[i]->p_vaddr - base_vaddr;
12351aa696baSMark Johnston 		error = vm_map_protect(kernel_map,
12361aa696baSMark Johnston 		    (vm_offset_t)segbase,
12371aa696baSMark Johnston 		    (vm_offset_t)segbase + round_page(segs[i]->p_memsz),
12380659df6fSKonstantin Belousov 		    prot, 0, VM_MAP_PROTECT_SET_PROT);
12391aa696baSMark Johnston 		if (error != KERN_SUCCESS) {
12401aa696baSMark Johnston 			error = ENOMEM;
12411aa696baSMark Johnston 			goto out;
12421aa696baSMark Johnston 		}
12431aa696baSMark Johnston 	}
12441aa696baSMark Johnston #endif
12451aa696baSMark Johnston 
12462f22b3ffSMatthew D Fleming 	/*
12472f22b3ffSMatthew D Fleming 	 * Try and load the symbol table if it's present.  (you can
12482f22b3ffSMatthew D Fleming 	 * strip it!)
12492f22b3ffSMatthew D Fleming 	 */
1250caab6e90SPeter Wemm 	nbytes = hdr->e_shnum * hdr->e_shentsize;
1251caab6e90SPeter Wemm 	if (nbytes == 0 || hdr->e_shoff == 0)
1252ca65d5c7SPeter Wemm 		goto nosyms;
1253a163d034SWarner Losh 	shdr = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO);
1254ca65d5c7SPeter Wemm 	error = vn_rdwr(UIO_READ, nd.ni_vp,
1255caab6e90SPeter Wemm 	    (caddr_t)shdr, nbytes, hdr->e_shoff,
12569ca43589SRobert Watson 	    UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
12579ca43589SRobert Watson 	    &resid, td);
12582f22b3ffSMatthew D Fleming 	if (error != 0)
1259ca65d5c7SPeter Wemm 		goto out;
12600067051fSMarcel Moolenaar 
12610067051fSMarcel Moolenaar 	/* Read section string table */
12620067051fSMarcel Moolenaar 	shstrindex = hdr->e_shstrndx;
12630067051fSMarcel Moolenaar 	if (shstrindex != 0 && shdr[shstrindex].sh_type == SHT_STRTAB &&
12640067051fSMarcel Moolenaar 	    shdr[shstrindex].sh_size != 0) {
12650067051fSMarcel Moolenaar 		nbytes = shdr[shstrindex].sh_size;
12660067051fSMarcel Moolenaar 		shstrs = malloc(nbytes, M_LINKER, M_WAITOK | M_ZERO);
12670067051fSMarcel Moolenaar 		error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)shstrs, nbytes,
12680067051fSMarcel Moolenaar 		    shdr[shstrindex].sh_offset, UIO_SYSSPACE, IO_NODELOCKED,
12690067051fSMarcel Moolenaar 		    td->td_ucred, NOCRED, &resid, td);
12700067051fSMarcel Moolenaar 		if (error)
12710067051fSMarcel Moolenaar 			goto out;
12720067051fSMarcel Moolenaar 	}
12730067051fSMarcel Moolenaar 
1274ca65d5c7SPeter Wemm 	symtabindex = -1;
1275ca65d5c7SPeter Wemm 	symstrindex = -1;
1276caab6e90SPeter Wemm 	for (i = 0; i < hdr->e_shnum; i++) {
1277ca65d5c7SPeter Wemm 		if (shdr[i].sh_type == SHT_SYMTAB) {
1278ca65d5c7SPeter Wemm 			symtabindex = i;
1279ca65d5c7SPeter Wemm 			symstrindex = shdr[i].sh_link;
12800067051fSMarcel Moolenaar 		} else if (shstrs != NULL && shdr[i].sh_name != 0 &&
12810067051fSMarcel Moolenaar 		    strcmp(shstrs + shdr[i].sh_name, ".ctors") == 0) {
12820067051fSMarcel Moolenaar 			/* Record relocated address and size of .ctors. */
12830067051fSMarcel Moolenaar 			lf->ctors_addr = mapbase + shdr[i].sh_addr - base_vaddr;
12840067051fSMarcel Moolenaar 			lf->ctors_size = shdr[i].sh_size;
1285ca65d5c7SPeter Wemm 		}
1286ca65d5c7SPeter Wemm 	}
1287ca65d5c7SPeter Wemm 	if (symtabindex < 0 || symstrindex < 0)
1288ca65d5c7SPeter Wemm 		goto nosyms;
1289ca65d5c7SPeter Wemm 
1290ca65d5c7SPeter Wemm 	symcnt = shdr[symtabindex].sh_size;
1291a163d034SWarner Losh 	ef->symbase = malloc(symcnt, M_LINKER, M_WAITOK);
1292ca65d5c7SPeter Wemm 	strcnt = shdr[symstrindex].sh_size;
1293a163d034SWarner Losh 	ef->strbase = malloc(strcnt, M_LINKER, M_WAITOK);
1294ca65d5c7SPeter Wemm 
1295ca65d5c7SPeter Wemm 	error = vn_rdwr(UIO_READ, nd.ni_vp,
1296ca65d5c7SPeter Wemm 	    ef->symbase, symcnt, shdr[symtabindex].sh_offset,
12979ca43589SRobert Watson 	    UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
12989ca43589SRobert Watson 	    &resid, td);
12992f22b3ffSMatthew D Fleming 	if (error != 0)
1300ca65d5c7SPeter Wemm 		goto out;
1301ca65d5c7SPeter Wemm 	error = vn_rdwr(UIO_READ, nd.ni_vp,
1302ca65d5c7SPeter Wemm 	    ef->strbase, strcnt, shdr[symstrindex].sh_offset,
13039ca43589SRobert Watson 	    UIO_SYSSPACE, IO_NODELOCKED, td->td_ucred, NOCRED,
13049ca43589SRobert Watson 	    &resid, td);
13052f22b3ffSMatthew D Fleming 	if (error != 0)
1306ca65d5c7SPeter Wemm 		goto out;
1307ca65d5c7SPeter Wemm 
1308ca65d5c7SPeter Wemm 	ef->ddbsymcnt = symcnt / sizeof(Elf_Sym);
1309ca65d5c7SPeter Wemm 	ef->ddbsymtab = (const Elf_Sym *)ef->symbase;
1310ca65d5c7SPeter Wemm 	ef->ddbstrcnt = strcnt;
1311ca65d5c7SPeter Wemm 	ef->ddbstrtab = ef->strbase;
1312ca65d5c7SPeter Wemm 
13138a710317SMarcel Moolenaar nosyms:
1314b19c9deaSIan Lepore 
1315b19c9deaSIan Lepore #ifdef __arm__
1316b19c9deaSIan Lepore 	link_elf_locate_exidx(lf, shdr, hdr->e_shnum);
1317b19c9deaSIan Lepore #endif
1318b19c9deaSIan Lepore 
1319c143d6c2SMarcel Moolenaar 	error = link_elf_link_common_finish(lf);
13202f22b3ffSMatthew D Fleming 	if (error != 0)
1321c143d6c2SMarcel Moolenaar 		goto out;
1322326e27d8SDoug Rabson 
1323a4f67738SDoug Rabson 	*result = lf;
1324a4f67738SDoug Rabson 
1325a4f67738SDoug Rabson out:
1326b249ce48SMateusz Guzik 	VOP_UNLOCK(nd.ni_vp);
1327f1d2d305SKonstantin Belousov 	vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
13282f22b3ffSMatthew D Fleming 	if (error != 0 && lf != NULL)
132965a311fcSPoul-Henning Kamp 		linker_file_unload(lf, LINKER_UNLOAD_FORCE);
1330ca65d5c7SPeter Wemm 	free(shdr, M_LINKER);
1331caab6e90SPeter Wemm 	free(firstpage, M_LINKER);
13320067051fSMarcel Moolenaar 	free(shstrs, M_LINKER);
1333a4f67738SDoug Rabson 
13342f22b3ffSMatthew D Fleming 	return (error);
1335a4f67738SDoug Rabson }
1336a4f67738SDoug Rabson 
133750c202c5SJeff Roberson Elf_Addr
133850c202c5SJeff Roberson elf_relocaddr(linker_file_t lf, Elf_Addr x)
133950c202c5SJeff Roberson {
134050c202c5SJeff Roberson 	elf_file_t ef;
134150c202c5SJeff Roberson 
134238dae42cSMark Johnston 	KASSERT(lf->ops->cls == (kobj_class_t)&link_elf_class,
134338dae42cSMark Johnston 	    ("elf_relocaddr: unexpected linker file %p", lf));
134438dae42cSMark Johnston 
134550c202c5SJeff Roberson 	ef = (elf_file_t)lf;
134650c202c5SJeff Roberson 	if (x >= ef->pcpu_start && x < ef->pcpu_stop)
134750c202c5SJeff Roberson 		return ((x - ef->pcpu_start) + ef->pcpu_base);
1348eddfbb76SRobert Watson #ifdef VIMAGE
1349eddfbb76SRobert Watson 	if (x >= ef->vnet_start && x < ef->vnet_stop)
1350eddfbb76SRobert Watson 		return ((x - ef->vnet_start) + ef->vnet_base);
1351eddfbb76SRobert Watson #endif
135250c202c5SJeff Roberson 	return (x);
135350c202c5SJeff Roberson }
135450c202c5SJeff Roberson 
1355a4f67738SDoug Rabson static void
1356de78ca7eSPeter Wemm link_elf_unload_file(linker_file_t file)
1357a4f67738SDoug Rabson {
1358326e27d8SDoug Rabson 	elf_file_t ef = (elf_file_t) file;
1359a4f67738SDoug Rabson 
13602f22b3ffSMatthew D Fleming 	if (ef->pcpu_base != 0) {
13612f22b3ffSMatthew D Fleming 		dpcpu_free((void *)ef->pcpu_base,
13622f22b3ffSMatthew D Fleming 		    ef->pcpu_stop - ef->pcpu_start);
136347813f5dSMikolaj Golub 		elf_set_delete(&set_pcpu_list, ef->pcpu_start);
136450c202c5SJeff Roberson 	}
1365eddfbb76SRobert Watson #ifdef VIMAGE
13662f22b3ffSMatthew D Fleming 	if (ef->vnet_base != 0) {
13672f22b3ffSMatthew D Fleming 		vnet_data_free((void *)ef->vnet_base,
13682f22b3ffSMatthew D Fleming 		    ef->vnet_stop - ef->vnet_start);
136947813f5dSMikolaj Golub 		elf_set_delete(&set_vnet_list, ef->vnet_start);
1370eddfbb76SRobert Watson 	}
1371eddfbb76SRobert Watson #endif
1372ecb01c64SMarcel Moolenaar #ifdef GDB
13732f22b3ffSMatthew D Fleming 	if (ef->gdb.l_ld != NULL) {
1374326e27d8SDoug Rabson 		GDB_STATE(RT_DELETE);
1375ed6c3888SPeter Wemm 		free((void *)(uintptr_t)ef->gdb.l_name, M_LINKER);
1376326e27d8SDoug Rabson 		link_elf_delete_gdb(&ef->gdb);
1377326e27d8SDoug Rabson 		GDB_STATE(RT_CONSISTENT);
1378326e27d8SDoug Rabson 	}
1379326e27d8SDoug Rabson #endif
1380326e27d8SDoug Rabson 
13811aeb23cdSMarcel Moolenaar 	/* Notify MD code that a module is being unloaded. */
13821aeb23cdSMarcel Moolenaar 	elf_cpu_unload_file(file);
13831aeb23cdSMarcel Moolenaar 
1384326e27d8SDoug Rabson 	if (ef->preloaded) {
138554823af2SPeter Wemm 		link_elf_unload_preload(file);
1386326e27d8SDoug Rabson 		return;
1387326e27d8SDoug Rabson 	}
1388c143d6c2SMarcel Moolenaar 
1389fe3db7c7SDoug Rabson #ifdef SPARSE_MAPPING
13902f22b3ffSMatthew D Fleming 	if (ef->object != NULL) {
1391fe3db7c7SDoug Rabson 		vm_map_remove(kernel_map, (vm_offset_t) ef->address,
1392fe3db7c7SDoug Rabson 		    (vm_offset_t) ef->address
1393fe3db7c7SDoug Rabson 		    + (ef->object->size << PAGE_SHIFT));
1394fe3db7c7SDoug Rabson 	}
1395fe3db7c7SDoug Rabson #else
1396a4f67738SDoug Rabson 	free(ef->address, M_LINKER);
1397fe3db7c7SDoug Rabson #endif
1398ca65d5c7SPeter Wemm 	free(ef->symbase, M_LINKER);
1399ca65d5c7SPeter Wemm 	free(ef->strbase, M_LINKER);
1400a2024a3eSJohn Birrell 	free(ef->ctftab, M_LINKER);
1401a2024a3eSJohn Birrell 	free(ef->ctfoff, M_LINKER);
1402a2024a3eSJohn Birrell 	free(ef->typoff, M_LINKER);
1403a4f67738SDoug Rabson }
1404a4f67738SDoug Rabson 
1405de78ca7eSPeter Wemm static void
140654823af2SPeter Wemm link_elf_unload_preload(linker_file_t file)
1407de78ca7eSPeter Wemm {
1408f822c9e2SMark Johnston 
140973624a80SMark Johnston 	if (file->pathname != NULL)
141073624a80SMark Johnston 		preload_delete_name(file->pathname);
1411de78ca7eSPeter Wemm }
1412de78ca7eSPeter Wemm 
1413fe3db7c7SDoug Rabson static const char *
1414757686b1SMarcel Moolenaar symbol_name(elf_file_t ef, Elf_Size r_info)
1415a4f67738SDoug Rabson {
1416fe3db7c7SDoug Rabson 	const Elf_Sym *ref;
1417a4f67738SDoug Rabson 
1418aa855a59SPeter Wemm 	if (ELF_R_SYM(r_info)) {
1419aa855a59SPeter Wemm 		ref = ef->symtab + ELF_R_SYM(r_info);
14202f22b3ffSMatthew D Fleming 		return (ef->strtab + ref->st_name);
14212f22b3ffSMatthew D Fleming 	}
14222f22b3ffSMatthew D Fleming 	return (NULL);
1423a4f67738SDoug Rabson }
1424a4f67738SDoug Rabson 
1425a4f67738SDoug Rabson static int
142636716fe2SMark Johnston symbol_type(elf_file_t ef, Elf_Size r_info)
1427a4f67738SDoug Rabson {
142836716fe2SMark Johnston 	const Elf_Sym *ref;
142936716fe2SMark Johnston 
143036716fe2SMark Johnston 	if (ELF_R_SYM(r_info)) {
143136716fe2SMark Johnston 		ref = ef->symtab + ELF_R_SYM(r_info);
143236716fe2SMark Johnston 		return (ELF_ST_TYPE(ref->st_info));
143336716fe2SMark Johnston 	}
143436716fe2SMark Johnston 	return (STT_NOTYPE);
143536716fe2SMark Johnston }
143636716fe2SMark Johnston 
143736716fe2SMark Johnston static int
143836716fe2SMark Johnston relocate_file1(elf_file_t ef, elf_lookup_fn lookup, elf_reloc_fn reloc,
143936716fe2SMark Johnston     bool ifuncs)
144036716fe2SMark Johnston {
1441fe3db7c7SDoug Rabson 	const Elf_Rel *rel;
1442fe3db7c7SDoug Rabson 	const Elf_Rela *rela;
1443aa855a59SPeter Wemm 	const char *symname;
1444a4f67738SDoug Rabson 
144536716fe2SMark Johnston #define	APPLY_RELOCS(iter, tbl, tblsize, type) do {			\
144636716fe2SMark Johnston 	for ((iter) = (tbl); (iter) != NULL &&				\
144736716fe2SMark Johnston 	    (iter) < (tbl) + (tblsize) / sizeof(*(iter)); (iter)++) {	\
144836716fe2SMark Johnston 		if ((symbol_type(ef, (iter)->r_info) ==			\
144936716fe2SMark Johnston 		    STT_GNU_IFUNC ||					\
145036716fe2SMark Johnston 		    elf_is_ifunc_reloc((iter)->r_info)) != ifuncs)	\
145136716fe2SMark Johnston 			continue;					\
145236716fe2SMark Johnston 		if (reloc(&ef->lf, (Elf_Addr)ef->address,		\
145336716fe2SMark Johnston 		    (iter), (type), lookup)) {				\
145436716fe2SMark Johnston 			symname = symbol_name(ef, (iter)->r_info);	\
145536716fe2SMark Johnston 			printf("link_elf: symbol %s undefined\n",	\
145636716fe2SMark Johnston 			    symname);					\
145736716fe2SMark Johnston 			return (ENOENT);				\
145836716fe2SMark Johnston 		}							\
145936716fe2SMark Johnston 	}								\
146036716fe2SMark Johnston } while (0)
1461a4f67738SDoug Rabson 
146236716fe2SMark Johnston 	APPLY_RELOCS(rel, ef->rel, ef->relsize, ELF_RELOC_REL);
146336716fe2SMark Johnston 	APPLY_RELOCS(rela, ef->rela, ef->relasize, ELF_RELOC_RELA);
146436716fe2SMark Johnston 	APPLY_RELOCS(rel, ef->pltrel, ef->pltrelsize, ELF_RELOC_REL);
146536716fe2SMark Johnston 	APPLY_RELOCS(rela, ef->pltrela, ef->pltrelasize, ELF_RELOC_RELA);
1466a4f67738SDoug Rabson 
146736716fe2SMark Johnston #undef APPLY_RELOCS
1468a4f67738SDoug Rabson 
14692f22b3ffSMatthew D Fleming 	return (0);
1470a4f67738SDoug Rabson }
1471a4f67738SDoug Rabson 
14727035cf14SKonstantin Belousov static int
14737035cf14SKonstantin Belousov relocate_file(elf_file_t ef)
14747035cf14SKonstantin Belousov {
147536716fe2SMark Johnston 	int error;
14767035cf14SKonstantin Belousov 
147736716fe2SMark Johnston 	error = relocate_file1(ef, elf_lookup, elf_reloc, false);
147836716fe2SMark Johnston 	if (error == 0)
147936716fe2SMark Johnston 		error = relocate_file1(ef, elf_lookup, elf_reloc, true);
148036716fe2SMark Johnston 	return (error);
14817035cf14SKonstantin Belousov }
14827035cf14SKonstantin Belousov 
1483fe3db7c7SDoug Rabson /*
1484fe3db7c7SDoug Rabson  * Hash function for symbol table lookup.  Don't even think about changing
1485fe3db7c7SDoug Rabson  * this.  It is specified by the System V ABI.
1486fe3db7c7SDoug Rabson  */
1487fe3db7c7SDoug Rabson static unsigned long
1488fe3db7c7SDoug Rabson elf_hash(const char *name)
1489a4f67738SDoug Rabson {
1490fe3db7c7SDoug Rabson 	const unsigned char *p = (const unsigned char *) name;
1491fe3db7c7SDoug Rabson 	unsigned long h = 0;
1492fe3db7c7SDoug Rabson 	unsigned long g;
1493a4f67738SDoug Rabson 
1494fe3db7c7SDoug Rabson 	while (*p != '\0') {
1495fe3db7c7SDoug Rabson 		h = (h << 4) + *p++;
1496fe3db7c7SDoug Rabson 		if ((g = h & 0xf0000000) != 0)
1497fe3db7c7SDoug Rabson 			h ^= g >> 24;
1498fe3db7c7SDoug Rabson 		h &= ~g;
1499a4f67738SDoug Rabson 	}
15002f22b3ffSMatthew D Fleming 	return (h);
1501fe3db7c7SDoug Rabson }
1502a4f67738SDoug Rabson 
150337c84183SPoul-Henning Kamp static int
150495c20fafSKonstantin Belousov link_elf_lookup_symbol1(linker_file_t lf, const char *name, c_linker_sym_t *sym,
150595c20fafSKonstantin Belousov     bool see_local)
1506a4f67738SDoug Rabson {
1507326e27d8SDoug Rabson 	elf_file_t ef = (elf_file_t) lf;
1508fe3db7c7SDoug Rabson 	unsigned long symnum;
15092d636ab0SPeter Wemm 	const Elf_Sym* symp;
15102d636ab0SPeter Wemm 	const char *strp;
1511fe3db7c7SDoug Rabson 	unsigned long hash;
1512a4f67738SDoug Rabson 
1513f6494f2eSJohn Baldwin 	/* If we don't have a hash, bail. */
1514f6494f2eSJohn Baldwin 	if (ef->buckets == NULL || ef->nbuckets == 0) {
1515f6494f2eSJohn Baldwin 		printf("link_elf_lookup_symbol: missing symbol hash table\n");
15162f22b3ffSMatthew D Fleming 		return (ENOENT);
1517f6494f2eSJohn Baldwin 	}
1518f6494f2eSJohn Baldwin 
15192d636ab0SPeter Wemm 	/* First, search hashed global symbols */
1520fe3db7c7SDoug Rabson 	hash = elf_hash(name);
1521fe3db7c7SDoug Rabson 	symnum = ef->buckets[hash % ef->nbuckets];
1522fe3db7c7SDoug Rabson 
1523fe3db7c7SDoug Rabson 	while (symnum != STN_UNDEF) {
1524fe3db7c7SDoug Rabson 		if (symnum >= ef->nchains) {
15252f22b3ffSMatthew D Fleming 			printf("%s: corrupt symbol table\n", __func__);
15262f22b3ffSMatthew D Fleming 			return (ENOENT);
1527a4f67738SDoug Rabson 		}
1528fe3db7c7SDoug Rabson 
1529fe3db7c7SDoug Rabson 		symp = ef->symtab + symnum;
1530fe3db7c7SDoug Rabson 		if (symp->st_name == 0) {
15312f22b3ffSMatthew D Fleming 			printf("%s: corrupt symbol table\n", __func__);
15322f22b3ffSMatthew D Fleming 			return (ENOENT);
1533fe3db7c7SDoug Rabson 		}
1534fe3db7c7SDoug Rabson 
1535fe3db7c7SDoug Rabson 		strp = ef->strtab + symp->st_name;
1536fe3db7c7SDoug Rabson 
1537fe3db7c7SDoug Rabson 		if (strcmp(name, strp) == 0) {
1538fe3db7c7SDoug Rabson 			if (symp->st_shndx != SHN_UNDEF ||
1539fe3db7c7SDoug Rabson 			    (symp->st_value != 0 &&
15407035cf14SKonstantin Belousov 			    (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
15417035cf14SKonstantin Belousov 			    ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) {
154295c20fafSKonstantin Belousov 				if (see_local ||
154395c20fafSKonstantin Belousov 				    ELF_ST_BIND(symp->st_info) != STB_LOCAL) {
1544d254af07SMatthew Dillon 					*sym = (c_linker_sym_t) symp;
15452f22b3ffSMatthew D Fleming 					return (0);
15462f22b3ffSMatthew D Fleming 				}
154795c20fafSKonstantin Belousov 			}
15482f22b3ffSMatthew D Fleming 			return (ENOENT);
1549fe3db7c7SDoug Rabson 		}
1550fe3db7c7SDoug Rabson 
1551fe3db7c7SDoug Rabson 		symnum = ef->chains[symnum];
1552a4f67738SDoug Rabson 	}
1553a4f67738SDoug Rabson 
15542f22b3ffSMatthew D Fleming 	return (ENOENT);
155595c20fafSKonstantin Belousov }
15562d636ab0SPeter Wemm 
155795c20fafSKonstantin Belousov static int
155895c20fafSKonstantin Belousov link_elf_lookup_symbol(linker_file_t lf, const char *name, c_linker_sym_t *sym)
155995c20fafSKonstantin Belousov {
1560*ecd8245eSKonstantin Belousov 	if (link_elf_leak_locals)
1561*ecd8245eSKonstantin Belousov 		return (link_elf_lookup_debug_symbol(lf, name, sym));
156295c20fafSKonstantin Belousov 	return (link_elf_lookup_symbol1(lf, name, sym, false));
156395c20fafSKonstantin Belousov }
156495c20fafSKonstantin Belousov 
156595c20fafSKonstantin Belousov static int
156695c20fafSKonstantin Belousov link_elf_lookup_debug_symbol(linker_file_t lf, const char *name,
156795c20fafSKonstantin Belousov     c_linker_sym_t *sym)
156895c20fafSKonstantin Belousov {
156995c20fafSKonstantin Belousov 	elf_file_t ef = (elf_file_t)lf;
157095c20fafSKonstantin Belousov 	const Elf_Sym* symp;
157195c20fafSKonstantin Belousov 	const char *strp;
157295c20fafSKonstantin Belousov 	int i;
157395c20fafSKonstantin Belousov 
157495c20fafSKonstantin Belousov 	if (link_elf_lookup_symbol1(lf, name, sym, true) == 0)
157595c20fafSKonstantin Belousov 		return (0);
157695c20fafSKonstantin Belousov 
15772d636ab0SPeter Wemm 	for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
15782d636ab0SPeter Wemm 		strp = ef->ddbstrtab + symp->st_name;
15792d636ab0SPeter Wemm 		if (strcmp(name, strp) == 0) {
15802d636ab0SPeter Wemm 			if (symp->st_shndx != SHN_UNDEF ||
15812d636ab0SPeter Wemm 			    (symp->st_value != 0 &&
15827035cf14SKonstantin Belousov 			    (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
15837035cf14SKonstantin Belousov 			    ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC))) {
1584d254af07SMatthew Dillon 				*sym = (c_linker_sym_t) symp;
15852f22b3ffSMatthew D Fleming 				return (0);
15862f22b3ffSMatthew D Fleming 			}
15872f22b3ffSMatthew D Fleming 			return (ENOENT);
15882d636ab0SPeter Wemm 		}
15892d636ab0SPeter Wemm 	}
15902d636ab0SPeter Wemm 
15912f22b3ffSMatthew D Fleming 	return (ENOENT);
1592a4f67738SDoug Rabson }
1593a4f67738SDoug Rabson 
1594de78ca7eSPeter Wemm static int
159595c20fafSKonstantin Belousov link_elf_symbol_values1(linker_file_t lf, c_linker_sym_t sym,
159695c20fafSKonstantin Belousov     linker_symval_t *symval, bool see_local)
1597a4f67738SDoug Rabson {
15987035cf14SKonstantin Belousov 	elf_file_t ef;
15997035cf14SKonstantin Belousov 	const Elf_Sym *es;
16007035cf14SKonstantin Belousov 	caddr_t val;
1601a4f67738SDoug Rabson 
16027035cf14SKonstantin Belousov 	ef = (elf_file_t)lf;
16037035cf14SKonstantin Belousov 	es = (const Elf_Sym *)sym;
160495c20fafSKonstantin Belousov 	if (es >= ef->symtab && es < ef->symtab + ef->nchains) {
160595c20fafSKonstantin Belousov 		if (!see_local && ELF_ST_BIND(es->st_info) == STB_LOCAL)
160695c20fafSKonstantin Belousov 			return (ENOENT);
1607a4f67738SDoug Rabson 		symval->name = ef->strtab + es->st_name;
16087035cf14SKonstantin Belousov 		val = (caddr_t)ef->address + es->st_value;
16097035cf14SKonstantin Belousov 		if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
16107035cf14SKonstantin Belousov 			val = ((caddr_t (*)(void))val)();
16117035cf14SKonstantin Belousov 		symval->value = val;
1612a4f67738SDoug Rabson 		symval->size = es->st_size;
16132f22b3ffSMatthew D Fleming 		return (0);
1614a4f67738SDoug Rabson 	}
161595c20fafSKonstantin Belousov 	return (ENOENT);
161695c20fafSKonstantin Belousov }
161795c20fafSKonstantin Belousov 
161895c20fafSKonstantin Belousov static int
161995c20fafSKonstantin Belousov link_elf_symbol_values(linker_file_t lf, c_linker_sym_t sym,
162095c20fafSKonstantin Belousov     linker_symval_t *symval)
162195c20fafSKonstantin Belousov {
1622*ecd8245eSKonstantin Belousov 	if (link_elf_leak_locals)
1623*ecd8245eSKonstantin Belousov 		return (link_elf_debug_symbol_values(lf, sym, symval));
162495c20fafSKonstantin Belousov 	return (link_elf_symbol_values1(lf, sym, symval, false));
162595c20fafSKonstantin Belousov }
162695c20fafSKonstantin Belousov 
162795c20fafSKonstantin Belousov static int
162895c20fafSKonstantin Belousov link_elf_debug_symbol_values(linker_file_t lf, c_linker_sym_t sym,
162995c20fafSKonstantin Belousov     linker_symval_t *symval)
163095c20fafSKonstantin Belousov {
163195c20fafSKonstantin Belousov 	elf_file_t ef = (elf_file_t)lf;
163295c20fafSKonstantin Belousov 	const Elf_Sym *es = (const Elf_Sym *)sym;
163395c20fafSKonstantin Belousov 	caddr_t val;
163495c20fafSKonstantin Belousov 
163595c20fafSKonstantin Belousov 	if (link_elf_symbol_values1(lf, sym, symval, true) == 0)
163695c20fafSKonstantin Belousov 		return (0);
16372d636ab0SPeter Wemm 	if (ef->symtab == ef->ddbsymtab)
16382f22b3ffSMatthew D Fleming 		return (ENOENT);
163995c20fafSKonstantin Belousov 
16405cf87418SMarcel Moolenaar 	if (es >= ef->ddbsymtab && es < (ef->ddbsymtab + ef->ddbsymcnt)) {
16412d636ab0SPeter Wemm 		symval->name = ef->ddbstrtab + es->st_name;
16427035cf14SKonstantin Belousov 		val = (caddr_t)ef->address + es->st_value;
16437035cf14SKonstantin Belousov 		if (ELF_ST_TYPE(es->st_info) == STT_GNU_IFUNC)
16447035cf14SKonstantin Belousov 			val = ((caddr_t (*)(void))val)();
16457035cf14SKonstantin Belousov 		symval->value = val;
16462d636ab0SPeter Wemm 		symval->size = es->st_size;
16472f22b3ffSMatthew D Fleming 		return (0);
16482d636ab0SPeter Wemm 	}
16492f22b3ffSMatthew D Fleming 	return (ENOENT);
16502d636ab0SPeter Wemm }
1651a4f67738SDoug Rabson 
1652a4f67738SDoug Rabson static int
1653a4f67738SDoug Rabson link_elf_search_symbol(linker_file_t lf, caddr_t value,
1654d254af07SMatthew Dillon     c_linker_sym_t *sym, long *diffp)
1655a4f67738SDoug Rabson {
1656326e27d8SDoug Rabson 	elf_file_t ef = (elf_file_t)lf;
1657586453feSBruce Evans 	u_long off = (uintptr_t)(void *)value;
1658a4f67738SDoug Rabson 	u_long diff = off;
1659586453feSBruce Evans 	u_long st_value;
1660fe3db7c7SDoug Rabson 	const Elf_Sym *es;
1661b85f65afSPedro F. Giffuni 	const Elf_Sym *best = NULL;
1662a4f67738SDoug Rabson 	int i;
1663a4f67738SDoug Rabson 
16642d636ab0SPeter Wemm 	for (i = 0, es = ef->ddbsymtab; i < ef->ddbsymcnt; i++, es++) {
1665a4f67738SDoug Rabson 		if (es->st_name == 0)
1666a4f67738SDoug Rabson 			continue;
1667586453feSBruce Evans 		st_value = es->st_value + (uintptr_t) (void *) ef->address;
1668b5abfb70SPeter Wemm 		if (off >= st_value) {
1669b5abfb70SPeter Wemm 			if (off - st_value < diff) {
1670b5abfb70SPeter Wemm 				diff = off - st_value;
1671a4f67738SDoug Rabson 				best = es;
1672a4f67738SDoug Rabson 				if (diff == 0)
1673a4f67738SDoug Rabson 					break;
1674b5abfb70SPeter Wemm 			} else if (off - st_value == diff) {
1675a4f67738SDoug Rabson 				best = es;
1676a4f67738SDoug Rabson 			}
1677a4f67738SDoug Rabson 		}
1678a4f67738SDoug Rabson 	}
1679b85f65afSPedro F. Giffuni 	if (best == NULL)
1680a4f67738SDoug Rabson 		*diffp = off;
1681a4f67738SDoug Rabson 	else
1682a4f67738SDoug Rabson 		*diffp = diff;
1683d254af07SMatthew Dillon 	*sym = (c_linker_sym_t) best;
1684a4f67738SDoug Rabson 
16852f22b3ffSMatthew D Fleming 	return (0);
1686a4f67738SDoug Rabson }
1687f41325dbSPeter Wemm 
1688f41325dbSPeter Wemm /*
1689f41325dbSPeter Wemm  * Look up a linker set on an ELF system.
1690f41325dbSPeter Wemm  */
1691f41325dbSPeter Wemm static int
1692f41325dbSPeter Wemm link_elf_lookup_set(linker_file_t lf, const char *name,
1693f41325dbSPeter Wemm     void ***startp, void ***stopp, int *countp)
1694f41325dbSPeter Wemm {
1695f41325dbSPeter Wemm 	c_linker_sym_t sym;
1696f41325dbSPeter Wemm 	linker_symval_t symval;
1697f41325dbSPeter Wemm 	char *setsym;
1698f41325dbSPeter Wemm 	void **start, **stop;
1699f41325dbSPeter Wemm 	int len, error = 0, count;
1700f41325dbSPeter Wemm 
1701f41325dbSPeter Wemm 	len = strlen(name) + sizeof("__start_set_"); /* sizeof includes \0 */
1702a163d034SWarner Losh 	setsym = malloc(len, M_LINKER, M_WAITOK);
1703f41325dbSPeter Wemm 
1704f41325dbSPeter Wemm 	/* get address of first entry */
1705f41325dbSPeter Wemm 	snprintf(setsym, len, "%s%s", "__start_set_", name);
1706f41325dbSPeter Wemm 	error = link_elf_lookup_symbol(lf, setsym, &sym);
17072f22b3ffSMatthew D Fleming 	if (error != 0)
1708f41325dbSPeter Wemm 		goto out;
1709f41325dbSPeter Wemm 	link_elf_symbol_values(lf, sym, &symval);
1710f41325dbSPeter Wemm 	if (symval.value == 0) {
1711f41325dbSPeter Wemm 		error = ESRCH;
1712f41325dbSPeter Wemm 		goto out;
1713f41325dbSPeter Wemm 	}
1714f41325dbSPeter Wemm 	start = (void **)symval.value;
1715f41325dbSPeter Wemm 
1716f41325dbSPeter Wemm 	/* get address of last entry */
1717f41325dbSPeter Wemm 	snprintf(setsym, len, "%s%s", "__stop_set_", name);
1718f41325dbSPeter Wemm 	error = link_elf_lookup_symbol(lf, setsym, &sym);
17192f22b3ffSMatthew D Fleming 	if (error != 0)
1720f41325dbSPeter Wemm 		goto out;
1721f41325dbSPeter Wemm 	link_elf_symbol_values(lf, sym, &symval);
1722f41325dbSPeter Wemm 	if (symval.value == 0) {
1723f41325dbSPeter Wemm 		error = ESRCH;
1724f41325dbSPeter Wemm 		goto out;
1725f41325dbSPeter Wemm 	}
1726f41325dbSPeter Wemm 	stop = (void **)symval.value;
1727f41325dbSPeter Wemm 
1728f41325dbSPeter Wemm 	/* and the number of entries */
1729f41325dbSPeter Wemm 	count = stop - start;
1730f41325dbSPeter Wemm 
1731f41325dbSPeter Wemm 	/* and copy out */
17322f22b3ffSMatthew D Fleming 	if (startp != NULL)
1733f41325dbSPeter Wemm 		*startp = start;
17342f22b3ffSMatthew D Fleming 	if (stopp != NULL)
1735f41325dbSPeter Wemm 		*stopp = stop;
17362f22b3ffSMatthew D Fleming 	if (countp != NULL)
1737f41325dbSPeter Wemm 		*countp = count;
1738f41325dbSPeter Wemm 
1739f41325dbSPeter Wemm out:
1740f41325dbSPeter Wemm 	free(setsym, M_LINKER);
17412f22b3ffSMatthew D Fleming 	return (error);
1742f41325dbSPeter Wemm }
1743bb9fe9ddSBrian Feldman 
1744bb9fe9ddSBrian Feldman static int
1745bb9fe9ddSBrian Feldman link_elf_each_function_name(linker_file_t file,
17462f22b3ffSMatthew D Fleming   int (*callback)(const char *, void *), void *opaque)
17472f22b3ffSMatthew D Fleming {
1748bb9fe9ddSBrian Feldman 	elf_file_t ef = (elf_file_t)file;
1749bb9fe9ddSBrian Feldman 	const Elf_Sym *symp;
1750bb9fe9ddSBrian Feldman 	int i, error;
1751bb9fe9ddSBrian Feldman 
1752bb9fe9ddSBrian Feldman 	/* Exhaustive search */
1753bb9fe9ddSBrian Feldman 	for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1754bb9fe9ddSBrian Feldman 		if (symp->st_value != 0 &&
17557035cf14SKonstantin Belousov 		    (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
17567035cf14SKonstantin Belousov 		    ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
1757bb9fe9ddSBrian Feldman 			error = callback(ef->ddbstrtab + symp->st_name, opaque);
17582f22b3ffSMatthew D Fleming 			if (error != 0)
1759bb9fe9ddSBrian Feldman 				return (error);
1760bb9fe9ddSBrian Feldman 		}
1761bb9fe9ddSBrian Feldman 	}
1762bb9fe9ddSBrian Feldman 	return (0);
1763bb9fe9ddSBrian Feldman }
176484201059SMarcel Moolenaar 
1765a2024a3eSJohn Birrell static int
1766a2024a3eSJohn Birrell link_elf_each_function_nameval(linker_file_t file,
1767a2024a3eSJohn Birrell     linker_function_nameval_callback_t callback, void *opaque)
1768a2024a3eSJohn Birrell {
1769a2024a3eSJohn Birrell 	linker_symval_t symval;
1770a2024a3eSJohn Birrell 	elf_file_t ef = (elf_file_t)file;
1771a2024a3eSJohn Birrell 	const Elf_Sym *symp;
1772a2024a3eSJohn Birrell 	int i, error;
1773a2024a3eSJohn Birrell 
1774a2024a3eSJohn Birrell 	/* Exhaustive search */
1775a2024a3eSJohn Birrell 	for (i = 0, symp = ef->ddbsymtab; i < ef->ddbsymcnt; i++, symp++) {
1776a2024a3eSJohn Birrell 		if (symp->st_value != 0 &&
17777035cf14SKonstantin Belousov 		    (ELF_ST_TYPE(symp->st_info) == STT_FUNC ||
17787035cf14SKonstantin Belousov 		    ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC)) {
177995c20fafSKonstantin Belousov 			error = link_elf_debug_symbol_values(file,
17802f22b3ffSMatthew D Fleming 			    (c_linker_sym_t) symp, &symval);
178195c20fafSKonstantin Belousov 			if (error == 0)
1782a2024a3eSJohn Birrell 				error = callback(file, i, &symval, opaque);
17832f22b3ffSMatthew D Fleming 			if (error != 0)
1784a2024a3eSJohn Birrell 				return (error);
1785a2024a3eSJohn Birrell 		}
1786a2024a3eSJohn Birrell 	}
1787a2024a3eSJohn Birrell 	return (0);
1788a2024a3eSJohn Birrell }
1789a2024a3eSJohn Birrell 
1790169d513cSJake Burkholder const Elf_Sym *
1791757686b1SMarcel Moolenaar elf_get_sym(linker_file_t lf, Elf_Size symidx)
1792169d513cSJake Burkholder {
1793169d513cSJake Burkholder 	elf_file_t ef = (elf_file_t)lf;
1794169d513cSJake Burkholder 
1795169d513cSJake Burkholder 	if (symidx >= ef->nchains)
1796169d513cSJake Burkholder 		return (NULL);
1797169d513cSJake Burkholder 	return (ef->symtab + symidx);
1798169d513cSJake Burkholder }
1799169d513cSJake Burkholder 
180047f75012SMarcel Moolenaar const char *
1801757686b1SMarcel Moolenaar elf_get_symname(linker_file_t lf, Elf_Size symidx)
180247f75012SMarcel Moolenaar {
180347f75012SMarcel Moolenaar 	elf_file_t ef = (elf_file_t)lf;
180447f75012SMarcel Moolenaar 	const Elf_Sym *sym;
180547f75012SMarcel Moolenaar 
180647f75012SMarcel Moolenaar 	if (symidx >= ef->nchains)
180747f75012SMarcel Moolenaar 		return (NULL);
180847f75012SMarcel Moolenaar 	sym = ef->symtab + symidx;
180947f75012SMarcel Moolenaar 	return (ef->strtab + sym->st_name);
181047f75012SMarcel Moolenaar }
181147f75012SMarcel Moolenaar 
1812d297ad16SMarcel Moolenaar /*
1813d297ad16SMarcel Moolenaar  * Symbol lookup function that can be used when the symbol index is known (ie
1814d297ad16SMarcel Moolenaar  * in relocations). It uses the symbol index instead of doing a fully fledged
1815d297ad16SMarcel Moolenaar  * hash table based lookup when such is valid. For example for local symbols.
1816d297ad16SMarcel Moolenaar  * This is not only more efficient, it's also more correct. It's not always
1817d297ad16SMarcel Moolenaar  * the case that the symbol can be found through the hash table.
1818d297ad16SMarcel Moolenaar  */
1819cff8c6f2SKonstantin Belousov static int
1820cff8c6f2SKonstantin Belousov elf_lookup(linker_file_t lf, Elf_Size symidx, int deps, Elf_Addr *res)
1821d297ad16SMarcel Moolenaar {
1822d297ad16SMarcel Moolenaar 	elf_file_t ef = (elf_file_t)lf;
1823d297ad16SMarcel Moolenaar 	const Elf_Sym *sym;
1824d297ad16SMarcel Moolenaar 	const char *symbol;
182547813f5dSMikolaj Golub 	Elf_Addr addr, start, base;
1826d297ad16SMarcel Moolenaar 
1827d297ad16SMarcel Moolenaar 	/* Don't even try to lookup the symbol if the index is bogus. */
1828cff8c6f2SKonstantin Belousov 	if (symidx >= ef->nchains) {
1829cff8c6f2SKonstantin Belousov 		*res = 0;
1830cff8c6f2SKonstantin Belousov 		return (EINVAL);
1831cff8c6f2SKonstantin Belousov 	}
1832d297ad16SMarcel Moolenaar 
1833d297ad16SMarcel Moolenaar 	sym = ef->symtab + symidx;
1834d297ad16SMarcel Moolenaar 
1835d297ad16SMarcel Moolenaar 	/*
1836d297ad16SMarcel Moolenaar 	 * Don't do a full lookup when the symbol is local. It may even
1837d297ad16SMarcel Moolenaar 	 * fail because it may not be found through the hash table.
1838d297ad16SMarcel Moolenaar 	 */
1839d297ad16SMarcel Moolenaar 	if (ELF_ST_BIND(sym->st_info) == STB_LOCAL) {
1840d297ad16SMarcel Moolenaar 		/* Force lookup failure when we have an insanity. */
1841cff8c6f2SKonstantin Belousov 		if (sym->st_shndx == SHN_UNDEF || sym->st_value == 0) {
1842cff8c6f2SKonstantin Belousov 			*res = 0;
1843cff8c6f2SKonstantin Belousov 			return (EINVAL);
1844cff8c6f2SKonstantin Belousov 		}
1845cff8c6f2SKonstantin Belousov 		*res = ((Elf_Addr)ef->address + sym->st_value);
1846d297ad16SMarcel Moolenaar 		return (0);
1847d297ad16SMarcel Moolenaar 	}
1848d297ad16SMarcel Moolenaar 
1849d297ad16SMarcel Moolenaar 	/*
1850d297ad16SMarcel Moolenaar 	 * XXX we can avoid doing a hash table based lookup for global
1851d297ad16SMarcel Moolenaar 	 * symbols as well. This however is not always valid, so we'll
1852d297ad16SMarcel Moolenaar 	 * just do it the hard way for now. Performance tweaks can
1853d297ad16SMarcel Moolenaar 	 * always be added.
1854d297ad16SMarcel Moolenaar 	 */
1855d297ad16SMarcel Moolenaar 
1856d297ad16SMarcel Moolenaar 	symbol = ef->strtab + sym->st_name;
1857d297ad16SMarcel Moolenaar 
1858d297ad16SMarcel Moolenaar 	/* Force a lookup failure if the symbol name is bogus. */
1859cff8c6f2SKonstantin Belousov 	if (*symbol == 0) {
1860cff8c6f2SKonstantin Belousov 		*res = 0;
1861cff8c6f2SKonstantin Belousov 		return (EINVAL);
1862cff8c6f2SKonstantin Belousov 	}
1863d297ad16SMarcel Moolenaar 
186447813f5dSMikolaj Golub 	addr = ((Elf_Addr)linker_file_lookup_symbol(lf, symbol, deps));
1865e8e0fac5SMark Johnston 	if (addr == 0 && ELF_ST_BIND(sym->st_info) != STB_WEAK) {
1866e8e0fac5SMark Johnston 		*res = 0;
1867e8e0fac5SMark Johnston 		return (EINVAL);
1868e8e0fac5SMark Johnston 	}
186947813f5dSMikolaj Golub 
187047813f5dSMikolaj Golub 	if (elf_set_find(&set_pcpu_list, addr, &start, &base))
187147813f5dSMikolaj Golub 		addr = addr - start + base;
187247813f5dSMikolaj Golub #ifdef VIMAGE
187347813f5dSMikolaj Golub 	else if (elf_set_find(&set_vnet_list, addr, &start, &base))
187447813f5dSMikolaj Golub 		addr = addr - start + base;
187547813f5dSMikolaj Golub #endif
1876cff8c6f2SKonstantin Belousov 	*res = addr;
1877cff8c6f2SKonstantin Belousov 	return (0);
1878d297ad16SMarcel Moolenaar }
18797251b4bfSJake Burkholder 
18807251b4bfSJake Burkholder static void
18817251b4bfSJake Burkholder link_elf_reloc_local(linker_file_t lf)
18827251b4bfSJake Burkholder {
18837251b4bfSJake Burkholder 	const Elf_Rel *rellim;
18847251b4bfSJake Burkholder 	const Elf_Rel *rel;
18857251b4bfSJake Burkholder 	const Elf_Rela *relalim;
18867251b4bfSJake Burkholder 	const Elf_Rela *rela;
18877251b4bfSJake Burkholder 	elf_file_t ef = (elf_file_t)lf;
18887251b4bfSJake Burkholder 
18897251b4bfSJake Burkholder 	/* Perform relocations without addend if there are any: */
18907251b4bfSJake Burkholder 	if ((rel = ef->rel) != NULL) {
18917251b4bfSJake Burkholder 		rellim = (const Elf_Rel *)((const char *)ef->rel + ef->relsize);
18927251b4bfSJake Burkholder 		while (rel < rellim) {
18932f22b3ffSMatthew D Fleming 			elf_reloc_local(lf, (Elf_Addr)ef->address, rel,
18942f22b3ffSMatthew D Fleming 			    ELF_RELOC_REL, elf_lookup);
18957251b4bfSJake Burkholder 			rel++;
18967251b4bfSJake Burkholder 		}
18977251b4bfSJake Burkholder 	}
18987251b4bfSJake Burkholder 
18997251b4bfSJake Burkholder 	/* Perform relocations with addend if there are any: */
19007251b4bfSJake Burkholder 	if ((rela = ef->rela) != NULL) {
19012f22b3ffSMatthew D Fleming 		relalim = (const Elf_Rela *)
19022f22b3ffSMatthew D Fleming 		    ((const char *)ef->rela + ef->relasize);
19037251b4bfSJake Burkholder 		while (rela < relalim) {
19042f22b3ffSMatthew D Fleming 			elf_reloc_local(lf, (Elf_Addr)ef->address, rela,
19052f22b3ffSMatthew D Fleming 			    ELF_RELOC_RELA, elf_lookup);
19067251b4bfSJake Burkholder 			rela++;
19077251b4bfSJake Burkholder 		}
19087251b4bfSJake Burkholder 	}
19097251b4bfSJake Burkholder }
191000a5db46SStacey Son 
191100a5db46SStacey Son static long
191200a5db46SStacey Son link_elf_symtab_get(linker_file_t lf, const Elf_Sym **symtab)
191300a5db46SStacey Son {
191400a5db46SStacey Son 	elf_file_t ef = (elf_file_t)lf;
191500a5db46SStacey Son 
191600a5db46SStacey Son 	*symtab = ef->ddbsymtab;
191700a5db46SStacey Son 
191800a5db46SStacey Son 	if (*symtab == NULL)
191900a5db46SStacey Son 		return (0);
192000a5db46SStacey Son 
192100a5db46SStacey Son 	return (ef->ddbsymcnt);
192200a5db46SStacey Son }
192300a5db46SStacey Son 
192400a5db46SStacey Son static long
192500a5db46SStacey Son link_elf_strtab_get(linker_file_t lf, caddr_t *strtab)
192600a5db46SStacey Son {
192700a5db46SStacey Son 	elf_file_t ef = (elf_file_t)lf;
192800a5db46SStacey Son 
192900a5db46SStacey Son 	*strtab = ef->ddbstrtab;
193000a5db46SStacey Son 
193100a5db46SStacey Son 	if (*strtab == NULL)
193200a5db46SStacey Son 		return (0);
193300a5db46SStacey Son 
193400a5db46SStacey Son 	return (ef->ddbstrcnt);
193500a5db46SStacey Son }
19367035cf14SKonstantin Belousov 
19379411e24dSBrandon Bergren #if defined(__i386__) || defined(__amd64__) || defined(__aarch64__) || defined(__powerpc__)
193836716fe2SMark Johnston /*
193936716fe2SMark Johnston  * Use this lookup routine when performing relocations early during boot.
194036716fe2SMark Johnston  * The generic lookup routine depends on kobj, which is not initialized
194136716fe2SMark Johnston  * at that point.
194236716fe2SMark Johnston  */
194336716fe2SMark Johnston static int
194436716fe2SMark Johnston elf_lookup_ifunc(linker_file_t lf, Elf_Size symidx, int deps __unused,
194536716fe2SMark Johnston     Elf_Addr *res)
194636716fe2SMark Johnston {
194736716fe2SMark Johnston 	elf_file_t ef;
194836716fe2SMark Johnston 	const Elf_Sym *symp;
194936716fe2SMark Johnston 	caddr_t val;
195036716fe2SMark Johnston 
195136716fe2SMark Johnston 	ef = (elf_file_t)lf;
195236716fe2SMark Johnston 	symp = ef->symtab + symidx;
195336716fe2SMark Johnston 	if (ELF_ST_TYPE(symp->st_info) == STT_GNU_IFUNC) {
195436716fe2SMark Johnston 		val = (caddr_t)ef->address + symp->st_value;
195536716fe2SMark Johnston 		*res = ((Elf_Addr (*)(void))val)();
195636716fe2SMark Johnston 		return (0);
195736716fe2SMark Johnston 	}
195836716fe2SMark Johnston 	return (ENOENT);
195936716fe2SMark Johnston }
196036716fe2SMark Johnston 
19617035cf14SKonstantin Belousov void
19627035cf14SKonstantin Belousov link_elf_ireloc(caddr_t kmdp)
19637035cf14SKonstantin Belousov {
19647035cf14SKonstantin Belousov 	struct elf_file eff;
19657035cf14SKonstantin Belousov 	elf_file_t ef;
19667035cf14SKonstantin Belousov 
19677035cf14SKonstantin Belousov 	ef = &eff;
196855c9d75eSKonstantin Belousov 
19693f102f58SMateusz Guzik 	bzero_early(ef, sizeof(*ef));
197055c9d75eSKonstantin Belousov 
19717035cf14SKonstantin Belousov 	ef->modptr = kmdp;
19727035cf14SKonstantin Belousov 	ef->dynamic = (Elf_Dyn *)&_DYNAMIC;
19739411e24dSBrandon Bergren 
19749411e24dSBrandon Bergren #ifdef RELOCATABLE_KERNEL
19759411e24dSBrandon Bergren 	ef->address = (caddr_t) (__startkernel - KERNBASE);
19769411e24dSBrandon Bergren #else
19777035cf14SKonstantin Belousov 	ef->address = 0;
19789411e24dSBrandon Bergren #endif
19799411e24dSBrandon Bergren 	parse_dynamic(ef);
19809411e24dSBrandon Bergren 
19817035cf14SKonstantin Belousov 	link_elf_preload_parse_symbols(ef);
198236716fe2SMark Johnston 	relocate_file1(ef, elf_lookup_ifunc, elf_reloc, true);
19837035cf14SKonstantin Belousov }
1984fcf7a481SAndrew Turner 
1985fcf7a481SAndrew Turner #if defined(__aarch64__) || defined(__amd64__)
1986fcf7a481SAndrew Turner void
1987fcf7a481SAndrew Turner link_elf_late_ireloc(void)
1988fcf7a481SAndrew Turner {
1989fcf7a481SAndrew Turner 	elf_file_t ef;
1990fcf7a481SAndrew Turner 
1991fcf7a481SAndrew Turner 	KASSERT(linker_kernel_file != NULL,
1992fcf7a481SAndrew Turner 	    ("link_elf_late_ireloc: No kernel linker file found"));
1993fcf7a481SAndrew Turner 	ef = (elf_file_t)linker_kernel_file;
1994fcf7a481SAndrew Turner 
1995fcf7a481SAndrew Turner 	relocate_file1(ef, elf_lookup_ifunc, elf_reloc_late, true);
1996fcf7a481SAndrew Turner }
1997fcf7a481SAndrew Turner #endif
19987035cf14SKonstantin Belousov #endif
1999