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/11.2/sys/powerpc/powerpc/elf64_machdep.c 331722 2018-03-29 02:50:57Z eadler $
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/altivec.h>
48 #include <machine/cpu.h>
49 #include <machine/elf.h>
50 #include <machine/md_var.h>
51
52 static void exec_setregs_funcdesc(struct thread *td, struct image_params *imgp,
53 u_long stack);
54
55 struct sysentvec elf64_freebsd_sysvec_v1 = {
56 .sv_size = SYS_MAXSYSCALL,
57 .sv_table = sysent,
58 .sv_mask = 0,
59 .sv_errsize = 0,
60 .sv_errtbl = NULL,
61 .sv_transtrap = NULL,
62 .sv_fixup = __elfN(freebsd_fixup),
63 .sv_sendsig = sendsig,
64 .sv_sigcode = sigcode64,
65 .sv_szsigcode = &szsigcode64,
66 .sv_name = "FreeBSD ELF64",
67 .sv_coredump = __elfN(coredump),
68 .sv_imgact_try = NULL,
69 .sv_minsigstksz = MINSIGSTKSZ,
70 .sv_pagesize = PAGE_SIZE,
71 .sv_minuser = VM_MIN_ADDRESS,
72 .sv_maxuser = VM_MAXUSER_ADDRESS,
73 .sv_usrstack = USRSTACK,
74 .sv_psstrings = PS_STRINGS,
75 .sv_stackprot = VM_PROT_ALL,
76 .sv_copyout_strings = exec_copyout_strings,
77 .sv_setregs = exec_setregs_funcdesc,
78 .sv_fixlimit = NULL,
79 .sv_maxssiz = NULL,
80 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP,
81 .sv_set_syscall_retval = cpu_set_syscall_retval,
82 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
83 .sv_syscallnames = syscallnames,
84 .sv_shared_page_base = SHAREDPAGE,
85 .sv_shared_page_len = PAGE_SIZE,
86 .sv_schedtail = NULL,
87 .sv_thread_detach = NULL,
88 .sv_trap = NULL,
89 };
90 INIT_SYSENTVEC(elf64_sysvec_v1, &elf64_freebsd_sysvec_v1);
91
92 struct sysentvec elf64_freebsd_sysvec_v2 = {
93 .sv_size = SYS_MAXSYSCALL,
94 .sv_table = sysent,
95 .sv_mask = 0,
96 .sv_errsize = 0,
97 .sv_errtbl = NULL,
98 .sv_transtrap = NULL,
99 .sv_fixup = __elfN(freebsd_fixup),
100 .sv_sendsig = sendsig,
101 .sv_sigcode = sigcode64_elfv2,
102 .sv_szsigcode = &szsigcode64_elfv2,
103 .sv_name = "FreeBSD ELF64 V2",
104 .sv_coredump = __elfN(coredump),
105 .sv_imgact_try = NULL,
106 .sv_minsigstksz = MINSIGSTKSZ,
107 .sv_pagesize = PAGE_SIZE,
108 .sv_minuser = VM_MIN_ADDRESS,
109 .sv_maxuser = VM_MAXUSER_ADDRESS,
110 .sv_usrstack = USRSTACK,
111 .sv_psstrings = PS_STRINGS,
112 .sv_stackprot = VM_PROT_ALL,
113 .sv_copyout_strings = exec_copyout_strings,
114 .sv_setregs = exec_setregs,
115 .sv_fixlimit = NULL,
116 .sv_maxssiz = NULL,
117 .sv_flags = SV_ABI_FREEBSD | SV_LP64 | SV_SHP,
118 .sv_set_syscall_retval = cpu_set_syscall_retval,
119 .sv_fetch_syscall_args = cpu_fetch_syscall_args,
120 .sv_syscallnames = syscallnames,
121 .sv_shared_page_base = SHAREDPAGE,
122 .sv_shared_page_len = PAGE_SIZE,
123 .sv_schedtail = NULL,
124 .sv_thread_detach = NULL,
125 };
126 INIT_SYSENTVEC(elf64_sysvec_v2, &elf64_freebsd_sysvec_v2);
127
128 static boolean_t ppc64_elfv1_header_match(struct image_params *params);
129 static boolean_t ppc64_elfv2_header_match(struct image_params *params);
130
131 static Elf64_Brandinfo freebsd_brand_info_elfv1 = {
132 .brand = ELFOSABI_FREEBSD,
133 .machine = EM_PPC64,
134 .compat_3_brand = "FreeBSD",
135 .emul_path = NULL,
136 .interp_path = "/libexec/ld-elf.so.1",
137 .sysvec = &elf64_freebsd_sysvec_v1,
138 .interp_newpath = NULL,
139 .brand_note = &elf64_freebsd_brandnote,
140 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
141 .header_supported = &ppc64_elfv1_header_match
142 };
143
144 SYSINIT(elf64v1, SI_SUB_EXEC, SI_ORDER_ANY,
145 (sysinit_cfunc_t) elf64_insert_brand_entry,
146 &freebsd_brand_info_elfv1);
147
148 static Elf64_Brandinfo freebsd_brand_info_elfv2 = {
149 .brand = ELFOSABI_FREEBSD,
150 .machine = EM_PPC64,
151 .compat_3_brand = "FreeBSD",
152 .emul_path = NULL,
153 .interp_path = "/libexec/ld-elf.so.1",
154 .sysvec = &elf64_freebsd_sysvec_v2,
155 .interp_newpath = NULL,
156 .brand_note = &elf64_freebsd_brandnote,
157 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
158 .header_supported = &ppc64_elfv2_header_match
159 };
160
161 SYSINIT(elf64v2, SI_SUB_EXEC, SI_ORDER_ANY,
162 (sysinit_cfunc_t) elf64_insert_brand_entry,
163 &freebsd_brand_info_elfv2);
164
165 static Elf64_Brandinfo freebsd_brand_oinfo = {
166 .brand = ELFOSABI_FREEBSD,
167 .machine = EM_PPC64,
168 .compat_3_brand = "FreeBSD",
169 .emul_path = NULL,
170 .interp_path = "/usr/libexec/ld-elf.so.1",
171 .sysvec = &elf64_freebsd_sysvec_v1,
172 .interp_newpath = NULL,
173 .brand_note = &elf64_freebsd_brandnote,
174 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE,
175 .header_supported = &ppc64_elfv1_header_match
176 };
177
178 SYSINIT(oelf64, SI_SUB_EXEC, SI_ORDER_ANY,
179 (sysinit_cfunc_t) elf64_insert_brand_entry,
180 &freebsd_brand_oinfo);
181
182 void elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase);
183
184 static boolean_t
185 ppc64_elfv1_header_match(struct image_params *params)
186 {
187 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header;
188 int abi = (hdr->e_flags & 3);
189
190 return (abi == 0 || abi == 1);
191 }
192
193 static boolean_t
194 ppc64_elfv2_header_match(struct image_params *params)
195 {
196 const Elf64_Ehdr *hdr = (const Elf64_Ehdr *)params->image_header;
197 int abi = (hdr->e_flags & 3);
198
199 return (abi == 2);
200 }
201
202 static void
203 exec_setregs_funcdesc(struct thread *td, struct image_params *imgp,
204 u_long stack)
205 {
206 struct trapframe *tf;
207 register_t entry_desc[3];
208
209 tf = trapframe(td);
210 exec_setregs(td, imgp, stack);
211
212 /*
213 * For 64-bit ELFv1, we need to disentangle the function
214 * descriptor
215 *
216 * 0. entry point
217 * 1. TOC value (r2)
218 * 2. Environment pointer (r11)
219 */
220
221 (void)copyin((void *)imgp->entry_addr, entry_desc,
222 sizeof(entry_desc));
223 tf->srr0 = entry_desc[0] + imgp->reloc_base;
224 tf->fixreg[2] = entry_desc[1] + imgp->reloc_base;
225 tf->fixreg[11] = entry_desc[2] + imgp->reloc_base;
226 }
227
228 void
229 elf64_dump_thread(struct thread *td, void *dst, size_t *off)
230 {
231 size_t len;
232 struct pcb *pcb;
233
234 len = 0;
235 pcb = td->td_pcb;
236 if (pcb->pcb_flags & PCB_VEC) {
237 save_vec_nodrop(td);
238 if (dst != NULL) {
239 len += elf64_populate_note(NT_PPC_VMX,
240 &pcb->pcb_vec, dst,
241 sizeof(pcb->pcb_vec), NULL);
242 } else
243 len += elf64_populate_note(NT_PPC_VMX, NULL, NULL,
244 sizeof(pcb->pcb_vec), NULL);
245 }
246 *off = len;
247 }
248
249
250 /* Process one elf relocation with addend. */
251 static int
252 elf_reloc_internal(linker_file_t lf, Elf_Addr relocbase, const void *data,
253 int type, int local, elf_lookup_fn lookup)
254 {
255 Elf_Addr *where;
256 Elf_Addr addr;
257 Elf_Addr addend;
258 Elf_Word rtype, symidx;
259 const Elf_Rela *rela;
260 int error;
261
262 switch (type) {
263 case ELF_RELOC_REL:
264 panic("PPC only supports RELA relocations");
265 break;
266 case ELF_RELOC_RELA:
267 rela = (const Elf_Rela *)data;
268 where = (Elf_Addr *) (relocbase + rela->r_offset);
269 addend = rela->r_addend;
270 rtype = ELF_R_TYPE(rela->r_info);
271 symidx = ELF_R_SYM(rela->r_info);
272 break;
273 default:
274 panic("elf_reloc: unknown relocation mode %d\n", type);
275 }
276
277 switch (rtype) {
278
279 case R_PPC_NONE:
280 break;
281
282 case R_PPC64_ADDR64: /* doubleword64 S + A */
283 error = lookup(lf, symidx, 1, &addr);
284 if (error != 0)
285 return -1;
286 addr += addend;
287 *where = addr;
288 break;
289
290 case R_PPC_RELATIVE: /* doubleword64 B + A */
291 *where = elf_relocaddr(lf, relocbase + addend);
292 break;
293
294 case R_PPC_JMP_SLOT: /* function descriptor copy */
295 lookup(lf, symidx, 1, &addr);
296 #if !defined(_CALL_ELF) || _CALL_ELF == 1
297 memcpy(where, (Elf_Addr *)addr, 3*sizeof(Elf_Addr));
298 #else
299 memcpy(where, (Elf_Addr *)addr, sizeof(Elf_Addr));
300 #endif
301 __asm __volatile("dcbst 0,%0; sync" :: "r"(where) : "memory");
302 break;
303
304 default:
305 printf("kldload: unexpected relocation type %d\n",
306 (int) rtype);
307 return -1;
308 }
309 return(0);
310 }
311
312 void
313 elf_reloc_self(Elf_Dyn *dynp, Elf_Addr relocbase)
314 {
315 Elf_Rela *rela = NULL, *relalim;
316 Elf_Addr relasz = 0;
317 Elf_Addr *where;
318
319 /*
320 * Extract the rela/relasz values from the dynamic section
321 */
322 for (; dynp->d_tag != DT_NULL; dynp++) {
323 switch (dynp->d_tag) {
324 case DT_RELA:
325 rela = (Elf_Rela *)(relocbase+dynp->d_un.d_ptr);
326 break;
327 case DT_RELASZ:
328 relasz = dynp->d_un.d_val;
329 break;
330 }
331 }
332
333 /*
334 * Relocate these values
335 */
336 relalim = (Elf_Rela *)((caddr_t)rela + relasz);
337 for (; rela < relalim; rela++) {
338 if (ELF_R_TYPE(rela->r_info) != R_PPC_RELATIVE)
339 continue;
340 where = (Elf_Addr *)(relocbase + rela->r_offset);
341 *where = (Elf_Addr)(relocbase + rela->r_addend);
342 }
343 }
344
345 int
346 elf_reloc(linker_file_t lf, Elf_Addr relocbase, const void *data, int type,
347 elf_lookup_fn lookup)
348 {
349
350 return (elf_reloc_internal(lf, relocbase, data, type, 0, lookup));
351 }
352
353 int
354 elf_reloc_local(linker_file_t lf, Elf_Addr relocbase, const void *data,
355 int type, elf_lookup_fn lookup)
356 {
357
358 return (elf_reloc_internal(lf, relocbase, data, type, 1, lookup));
359 }
360
361 int
362 elf_cpu_load_file(linker_file_t lf)
363 {
364 /* Only sync the cache for non-kernel modules */
365 if (lf->id != 1)
366 __syncicache(lf->address, lf->size);
367 return (0);
368 }
369
370 int
371 elf_cpu_unload_file(linker_file_t lf __unused)
372 {
373
374 return (0);
375 }
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