elf64_machdep.c revision 294136 
1/*-
2 * Copyright 1996-1998 John D. Polstra.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * $FreeBSD: stable/10/sys/powerpc/powerpc/elf64_machdep.c 294136 2016-01-16 07:56:49Z dchagin $
26 */
27
28#include <sys/param.h>
29#include <sys/kernel.h>
30#include <sys/systm.h>
31#include <sys/exec.h>
32#include <sys/imgact.h>
33#include <sys/malloc.h>
34#include <sys/proc.h>
35#include <sys/namei.h>
36#include <sys/fcntl.h>
37#include <sys/sysent.h>
38#include <sys/imgact_elf.h>
39#include <sys/syscall.h>
40#include <sys/signalvar.h>
41#include <sys/vnode.h>
42#include <sys/linker.h>
43
44#include <vm/vm.h>
45#include <vm/vm_param.h>
46
47#include <machine/cpu.h>
48#include <machine/elf.h>
49#include <machine/md_var.h>
50
51struct sysentvec elf64_freebsd_sysvec = {
52	.sv_size	= SYS_MAXSYSCALL,
53	.sv_table	= sysent,
54	.sv_mask	= 0,
55	.sv_sigsize	= 0,
56	.sv_sigtbl	= NULL,
57	.sv_errsize	= 0,
58	.sv_errtbl	= NULL,
59	.sv_transtrap	= NULL,
60	.sv_fixup	= __elfN(freebsd_fixup),
61	.sv_sendsig	= sendsig,
62	.sv_sigcode	= sigcode64,
63	.sv_szsigcode	= &szsigcode64,
64	.sv_prepsyscall	= NULL,
65	.sv_name	= "FreeBSD ELF64",
66	.sv_coredump	= __elfN(coredump),
67	.sv_imgact_try	= NULL,
68	.sv_minsigstksz	= MINSIGSTKSZ,
69	.sv_pagesize	= PAGE_SIZE,
70	.sv_minuser	= VM_MIN_ADDRESS,
71	.sv_maxuser	= VM_MAXUSER_ADDRESS,
72	.sv_usrstack	= USRSTACK,
73	.sv_psstrings	= PS_STRINGS,
74	.sv_stackprot	= VM_PROT_ALL,
75	.sv_copyout_strings = exec_copyout_strings,
76	.sv_setregs	= exec_setregs,
77	.sv_fixlimit	= NULL,
78	.sv_maxssiz	= NULL,
79	.sv_flags	= SV_ABI_FREEBSD | SV_LP64 | SV_SHP,
80	.sv_set_syscall_retval = cpu_set_syscall_retval,
81	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
82	.sv_syscallnames = syscallnames,
83	.sv_shared_page_base = SHAREDPAGE,
84	.sv_shared_page_len = PAGE_SIZE,
85	.sv_schedtail	= NULL,
86	.sv_thread_detach = NULL,
87	.sv_trap	= NULL,
88};
89INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
90
91static Elf64_Brandinfo freebsd_brand_info = {
92	.brand		= ELFOSABI_FREEBSD,
93	.machine	= EM_PPC64,
94	.compat_3_brand	= "FreeBSD",
95	.emul_path	= NULL,
96	.interp_path	= "/libexec/ld-elf.so.1",
97	.sysvec		= &elf64_freebsd_sysvec,
98	.interp_newpath	= NULL,
99	.brand_note	= &elf64_freebsd_brandnote,
100	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
101};
102
103SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
104    (sysinit_cfunc_t) elf64_insert_brand_entry,
105    &freebsd_brand_info);
106
107static Elf64_Brandinfo freebsd_brand_oinfo = {
108	.brand		= ELFOSABI_FREEBSD,
109	.machine	= EM_PPC64,
110	.compat_3_brand	= "FreeBSD",
111	.emul_path	= NULL,
112	.interp_path	= "/usr/libexec/ld-elf.so.1",
113	.sysvec		= &elf64_freebsd_sysvec,
114	.interp_newpath	= NULL,
115	.brand_note	= &elf64_freebsd_brandnote,
116	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
117};
118
119SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
120	(sysinit_cfunc_t) elf64_insert_brand_entry,
121	&freebsd_brand_oinfo);
122
123void
124elf64_dump_thread(struct thread *td __unused, void *dst __unused,
125    size_t *off __unused)
126{
127}
128
129
130/* Process one elf relocation with addend. */
131static int
132elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
133    int type, int local, elf_lookup_fn lookup)
134{
135	Elf_Addr *where;
136	Elf_Addr addr;
137	Elf_Addr addend;
138	Elf_Word rtype, symidx;
139	const Elf_Rela *rela;
140	int error;
141
142	switch (type) {
143	case ELF_RELOC_REL:
144		panic("PPC only supports RELA relocations");
145		break;
146	case ELF_RELOC_RELA:
147		rela = (const Elf_Rela *)data;
148		where = (Elf_Addr *) (relocbase + rela->r_offset);
149		addend = rela->r_addend;
150		rtype = ELF_R_TYPE(rela->r_info);
151		symidx = ELF_R_SYM(rela->r_info);
152		break;
153	default:
154		panic("elf_reloc: unknown relocation mode %d\n", type);
155	}
156
157	switch (rtype) {
158
159	case R_PPC_NONE:
160		break;
161
162	case R_PPC64_ADDR64:	/* doubleword64 S + A */
163		error = lookup(lf, symidx, 1, &addr);
164		if (error != 0)
165			return -1;
166		addr += addend;
167		*where = addr;
168		break;
169
170	case R_PPC_RELATIVE:	/* doubleword64 B + A */
171		*where = elf_relocaddr(lf, relocbase + addend);
172		break;
173
174	case R_PPC_JMP_SLOT:	/* function descriptor copy */
175		lookup(lf, symidx, 1, &addr);
176		memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr));
177		__asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory");
178		break;
179
180	default:
181		printf("kldload: unexpected relocation type %d\n",
182		    (int) rtype);
183		return -1;
184	}
185	return(0);
186}
187
188int
189elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
190    elf_lookup_fn lookup)
191{
192
193	return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
194}
195
196int
197elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
198    int type, elf_lookup_fn lookup)
199{
200
201	return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
202}
203
204int
205elf_cpu_load_file(linker_file_t lf)
206{
207	/* Only sync the cache for non-kernel modules */
208	if (lf->id != 1)
209		__syncicache(lf->address, lf->size);
210	return (0);
211}
212
213int
214elf_cpu_unload_file(linker_file_t lf __unused)
215{
216
217	return (0);
218}
219