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: releng/10.3/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
51 struct 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 };
89 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
90
91 static 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
103 SYSINIT(elf64, SI_SUB_EXEC, SI_ORDER_ANY,
104 (sysinit_cfunc_t) elf64_insert_brand_entry,
105 &freebsd_brand_info);
106
107 static 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
119 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
120 (sysinit_cfunc_t) elf64_insert_brand_entry,
121 &freebsd_brand_oinfo);
122
123 void
124 elf64_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. */
131 static int
132 elf_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
188 int
189 elf_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
196 int
197 elf_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
204 int
205 elf_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
213 int
214 elf_cpu_unload_file(linker_file_t lf __unused)
215 {
216
217 return (0);
218 }
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