elf64_machdep.c revision 293490 
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 293490 2016-01-09 14:53:08Z 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};
88INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
89
90static Elf64_Brandinfo freebsd_brand_info = {
91	.brand		= ELFOSABI_FREEBSD,
92	.machine	= EM_PPC64,
93	.compat_3_brand	= "FreeBSD",
94	.emul_path	= NULL,
95	.interp_path	= "/libexec/ld-elf.so.1",
96	.sysvec		= &elf64_freebsd_sysvec,
97	.interp_newpath	= NULL,
98	.brand_note	= &elf64_freebsd_brandnote,
99	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
100};
101
102SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
103    (sysinit_cfunc_t) elf64_insert_brand_entry,
104    &freebsd_brand_info);
105
106static Elf64_Brandinfo freebsd_brand_oinfo = {
107	.brand		= ELFOSABI_FREEBSD,
108	.machine	= EM_PPC64,
109	.compat_3_brand	= "FreeBSD",
110	.emul_path	= NULL,
111	.interp_path	= "/usr/libexec/ld-elf.so.1",
112	.sysvec		= &elf64_freebsd_sysvec,
113	.interp_newpath	= NULL,
114	.brand_note	= &elf64_freebsd_brandnote,
115	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
116};
117
118SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
119	(sysinit_cfunc_t) elf64_insert_brand_entry,
120	&freebsd_brand_oinfo);
121
122void
123elf64_dump_thread(struct thread *td __unused, void *dst __unused,
124    size_t *off __unused)
125{
126}
127
128
129/* Process one elf relocation with addend. */
130static int
131elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
132    int type, int local, elf_lookup_fn lookup)
133{
134	Elf_Addr *where;
135	Elf_Addr addr;
136	Elf_Addr addend;
137	Elf_Word rtype, symidx;
138	const Elf_Rela *rela;
139	int error;
140
141	switch (type) {
142	case ELF_RELOC_REL:
143		panic("PPC only supports RELA relocations");
144		break;
145	case ELF_RELOC_RELA:
146		rela = (const Elf_Rela *)data;
147		where = (Elf_Addr *) (relocbase + rela->r_offset);
148		addend = rela->r_addend;
149		rtype = ELF_R_TYPE(rela->r_info);
150		symidx = ELF_R_SYM(rela->r_info);
151		break;
152	default:
153		panic("elf_reloc: unknown relocation mode %d\n", type);
154	}
155
156	switch (rtype) {
157
158	case R_PPC_NONE:
159		break;
160
161	case R_PPC64_ADDR64:	/* doubleword64 S + A */
162		error = lookup(lf, symidx, 1, &addr);
163		if (error != 0)
164			return -1;
165		addr += addend;
166		*where = addr;
167		break;
168
169	case R_PPC_RELATIVE:	/* doubleword64 B + A */
170		*where = elf_relocaddr(lf, relocbase + addend);
171		break;
172
173	case R_PPC_JMP_SLOT:	/* function descriptor copy */
174		lookup(lf, symidx, 1, &addr);
175		memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr));
176		__asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory");
177		break;
178
179	default:
180		printf("kldload: unexpected relocation type %d\n",
181		    (int) rtype);
182		return -1;
183	}
184	return(0);
185}
186
187int
188elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
189    elf_lookup_fn lookup)
190{
191
192	return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
193}
194
195int
196elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
197    int type, elf_lookup_fn lookup)
198{
199
200	return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
201}
202
203int
204elf_cpu_load_file(linker_file_t lf)
205{
206	/* Only sync the cache for non-kernel modules */
207	if (lf->id != 1)
208		__syncicache(lf->address, lf->size);
209	return (0);
210}
211
212int
213elf_cpu_unload_file(linker_file_t lf __unused)
214{
215
216	return (0);
217}
218