module_64.c (7e3a68be42e10f5fa5890e97afc0afd992355bc3) module_64.c (77e69ee7ce0715c39b9a0cde68ff44fe467435ef)
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Kernel module help for PPC64.
3 Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
4
5*/
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8

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109 */
110 u32 jump[7];
111 /* Used by ftrace to identify stubs */
112 u32 magic;
113 /* Data for the above code */
114 func_desc_t funcdata;
115} __aligned(8);
116
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* Kernel module help for PPC64.
3 Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
4
5*/
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8

--- 100 unchanged lines hidden (view full) ---

109 */
110 u32 jump[7];
111 /* Used by ftrace to identify stubs */
112 u32 magic;
113 /* Data for the above code */
114 func_desc_t funcdata;
115} __aligned(8);
116
117struct ppc64_got_entry {
118 u64 addr;
119};
120
117/*
118 * PPC64 uses 24 bit jumps, but we need to jump into other modules or
119 * the kernel which may be further. So we jump to a stub.
120 *
121/*
122 * PPC64 uses 24 bit jumps, but we need to jump into other modules or
123 * the kernel which may be further. So we jump to a stub.
124 *
121 * For ELFv1 we need to use this to set up the new r2 value (aka TOC
122 * pointer). For ELFv2 it's the callee's responsibility to set up the
123 * new r2, but for both we need to save the old r2.
125 * Target address and TOC are loaded from function descriptor in the
126 * ppc64_stub_entry.
124 *
127 *
125 * We could simply patch the new r2 value and function pointer into
126 * the stub, but it's significantly shorter to put these values at the
127 * end of the stub code, and patch the stub address (32-bits relative
128 * to the TOC ptr, r2) into the stub.
128 * r12 is used to generate the target address, which is required for the
129 * ELFv2 global entry point calling convention.
130 *
131 * TOC handling:
132 * - PCREL does not have a TOC.
133 * - ELFv2 non-PCREL just has to save r2, the callee is responsible for
134 * setting its own TOC pointer at the global entry address.
135 * - ELFv1 must load the new TOC pointer from the function descriptor.
129 */
130static u32 ppc64_stub_insns[] = {
136 */
137static u32 ppc64_stub_insns[] = {
138#ifdef CONFIG_PPC_KERNEL_PCREL
139 /* pld r12,addr */
140 PPC_PREFIX_8LS | __PPC_PRFX_R(1),
141 PPC_INST_PLD | ___PPC_RT(_R12),
142#else
131 PPC_RAW_ADDIS(_R11, _R2, 0),
132 PPC_RAW_ADDI(_R11, _R11, 0),
133 /* Save current r2 value in magic place on the stack. */
134 PPC_RAW_STD(_R2, _R1, R2_STACK_OFFSET),
135 PPC_RAW_LD(_R12, _R11, 32),
136#ifdef CONFIG_PPC64_ELF_ABI_V1
137 /* Set up new r2 from function descriptor */
138 PPC_RAW_LD(_R2, _R11, 40),
139#endif
143 PPC_RAW_ADDIS(_R11, _R2, 0),
144 PPC_RAW_ADDI(_R11, _R11, 0),
145 /* Save current r2 value in magic place on the stack. */
146 PPC_RAW_STD(_R2, _R1, R2_STACK_OFFSET),
147 PPC_RAW_LD(_R12, _R11, 32),
148#ifdef CONFIG_PPC64_ELF_ABI_V1
149 /* Set up new r2 from function descriptor */
150 PPC_RAW_LD(_R2, _R11, 40),
151#endif
152#endif
140 PPC_RAW_MTCTR(_R12),
141 PPC_RAW_BCTR(),
142};
143
153 PPC_RAW_MTCTR(_R12),
154 PPC_RAW_BCTR(),
155};
156
144/* Count how many different 24-bit relocations (different symbol,
145 different addend) */
146static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num)
157/*
158 * Count how many different r_type relocations (different symbol,
159 * different addend).
160 */
161static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num,
162 unsigned long r_type)
147{
148 unsigned int i, r_info, r_addend, _count_relocs;
149
150 /* FIXME: Only count external ones --RR */
151 _count_relocs = 0;
152 r_info = 0;
153 r_addend = 0;
154 for (i = 0; i < num; i++)
163{
164 unsigned int i, r_info, r_addend, _count_relocs;
165
166 /* FIXME: Only count external ones --RR */
167 _count_relocs = 0;
168 r_info = 0;
169 r_addend = 0;
170 for (i = 0; i < num; i++)
155 /* Only count 24-bit relocs, others don't need stubs */
156 if (ELF64_R_TYPE(rela[i].r_info) == R_PPC_REL24 &&
171 /* Only count r_type relocs, others don't need stubs */
172 if (ELF64_R_TYPE(rela[i].r_info) == r_type &&
157 (r_info != ELF64_R_SYM(rela[i].r_info) ||
158 r_addend != rela[i].r_addend)) {
159 _count_relocs++;
160 r_info = ELF64_R_SYM(rela[i].r_info);
161 r_addend = rela[i].r_addend;
162 }
163
164 return _count_relocs;

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209 * count_relocs() to linear complexity O(n)
210 */
211 sort((void *)sechdrs[i].sh_addr,
212 sechdrs[i].sh_size / sizeof(Elf64_Rela),
213 sizeof(Elf64_Rela), relacmp, NULL);
214
215 relocs += count_relocs((void *)sechdrs[i].sh_addr,
216 sechdrs[i].sh_size
173 (r_info != ELF64_R_SYM(rela[i].r_info) ||
174 r_addend != rela[i].r_addend)) {
175 _count_relocs++;
176 r_info = ELF64_R_SYM(rela[i].r_info);
177 r_addend = rela[i].r_addend;
178 }
179
180 return _count_relocs;

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225 * count_relocs() to linear complexity O(n)
226 */
227 sort((void *)sechdrs[i].sh_addr,
228 sechdrs[i].sh_size / sizeof(Elf64_Rela),
229 sizeof(Elf64_Rela), relacmp, NULL);
230
231 relocs += count_relocs((void *)sechdrs[i].sh_addr,
232 sechdrs[i].sh_size
217 / sizeof(Elf64_Rela));
233 / sizeof(Elf64_Rela),
234 R_PPC_REL24);
235#ifdef CONFIG_PPC_KERNEL_PCREL
236 relocs += count_relocs((void *)sechdrs[i].sh_addr,
237 sechdrs[i].sh_size
238 / sizeof(Elf64_Rela),
239 R_PPC64_REL24_NOTOC);
240#endif
218 }
219 }
220
221#ifdef CONFIG_DYNAMIC_FTRACE
222 /* make the trampoline to the ftrace_caller */
223 relocs++;
224#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
225 /* an additional one for ftrace_regs_caller */
226 relocs++;
227#endif
228#endif
229
230 pr_debug("Looks like a total of %lu stubs, max\n", relocs);
231 return relocs * sizeof(struct ppc64_stub_entry);
232}
233
241 }
242 }
243
244#ifdef CONFIG_DYNAMIC_FTRACE
245 /* make the trampoline to the ftrace_caller */
246 relocs++;
247#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
248 /* an additional one for ftrace_regs_caller */
249 relocs++;
250#endif
251#endif
252
253 pr_debug("Looks like a total of %lu stubs, max\n", relocs);
254 return relocs * sizeof(struct ppc64_stub_entry);
255}
256
257#ifdef CONFIG_PPC_KERNEL_PCREL
258static int count_pcpu_relocs(const Elf64_Shdr *sechdrs,
259 const Elf64_Rela *rela, unsigned int num,
260 unsigned int symindex, unsigned int pcpu)
261{
262 unsigned int i, r_info, r_addend, _count_relocs;
263
264 _count_relocs = 0;
265 r_info = 0;
266 r_addend = 0;
267
268 for (i = 0; i < num; i++) {
269 Elf64_Sym *sym;
270
271 /* This is the symbol it is referring to */
272 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
273 + ELF64_R_SYM(rela[i].r_info);
274
275 if (sym->st_shndx == pcpu &&
276 (r_info != ELF64_R_SYM(rela[i].r_info) ||
277 r_addend != rela[i].r_addend)) {
278 _count_relocs++;
279 r_info = ELF64_R_SYM(rela[i].r_info);
280 r_addend = rela[i].r_addend;
281 }
282 }
283
284 return _count_relocs;
285}
286
287/* Get size of potential GOT required. */
288static unsigned long get_got_size(const Elf64_Ehdr *hdr,
289 const Elf64_Shdr *sechdrs,
290 struct module *me)
291{
292 /* One extra reloc so it's always 0-addr terminated */
293 unsigned long relocs = 1;
294 unsigned int i, symindex = 0;
295
296 for (i = 1; i < hdr->e_shnum; i++) {
297 if (sechdrs[i].sh_type == SHT_SYMTAB) {
298 symindex = i;
299 break;
300 }
301 }
302 WARN_ON_ONCE(!symindex);
303
304 /* Every relocated section... */
305 for (i = 1; i < hdr->e_shnum; i++) {
306 if (sechdrs[i].sh_type == SHT_RELA) {
307 pr_debug("Found relocations in section %u\n", i);
308 pr_debug("Ptr: %p. Number: %llu\n", (void *)sechdrs[i].sh_addr,
309 sechdrs[i].sh_size / sizeof(Elf64_Rela));
310
311 /*
312 * Sort the relocation information based on a symbol and
313 * addend key. This is a stable O(n*log n) complexity
314 * algorithm but it will reduce the complexity of
315 * count_relocs() to linear complexity O(n)
316 */
317 sort((void *)sechdrs[i].sh_addr,
318 sechdrs[i].sh_size / sizeof(Elf64_Rela),
319 sizeof(Elf64_Rela), relacmp, NULL);
320
321 relocs += count_relocs((void *)sechdrs[i].sh_addr,
322 sechdrs[i].sh_size
323 / sizeof(Elf64_Rela),
324 R_PPC64_GOT_PCREL34);
325
326 /*
327 * Percpu data access typically gets linked with
328 * REL34 relocations, but the percpu section gets
329 * moved at load time and requires that to be
330 * converted to GOT linkage.
331 */
332 if (IS_ENABLED(CONFIG_SMP) && symindex)
333 relocs += count_pcpu_relocs(sechdrs,
334 (void *)sechdrs[i].sh_addr,
335 sechdrs[i].sh_size
336 / sizeof(Elf64_Rela),
337 symindex, me->arch.pcpu_section);
338 }
339 }
340
341 pr_debug("Looks like a total of %lu GOT entries, max\n", relocs);
342 return relocs * sizeof(struct ppc64_got_entry);
343}
344#else /* CONFIG_PPC_KERNEL_PCREL */
345
234/* Still needed for ELFv2, for .TOC. */
235static void dedotify_versions(struct modversion_info *vers,
236 unsigned long size)
237{
238 struct modversion_info *end;
239
240 for (end = (void *)vers + size; vers < end; vers++)
241 if (vers->name[0] == '.') {

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275
276 for (i = 1; i < numsyms; i++) {
277 if (syms[i].st_shndx == SHN_ABS
278 && strcmp(strtab + syms[i].st_name, "TOC.") == 0)
279 return &syms[i];
280 }
281 return NULL;
282}
346/* Still needed for ELFv2, for .TOC. */
347static void dedotify_versions(struct modversion_info *vers,
348 unsigned long size)
349{
350 struct modversion_info *end;
351
352 for (end = (void *)vers + size; vers < end; vers++)
353 if (vers->name[0] == '.') {

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387
388 for (i = 1; i < numsyms; i++) {
389 if (syms[i].st_shndx == SHN_ABS
390 && strcmp(strtab + syms[i].st_name, "TOC.") == 0)
391 return &syms[i];
392 }
393 return NULL;
394}
395#endif /* CONFIG_PPC_KERNEL_PCREL */
283
284bool module_init_section(const char *name)
285{
286 /* We don't handle .init for the moment: always return false. */
287 return false;
288}
289
290int module_frob_arch_sections(Elf64_Ehdr *hdr,
291 Elf64_Shdr *sechdrs,
292 char *secstrings,
293 struct module *me)
294{
295 unsigned int i;
296
297 /* Find .toc and .stubs sections, symtab and strtab */
298 for (i = 1; i < hdr->e_shnum; i++) {
299 if (strcmp(secstrings + sechdrs[i].sh_name, ".stubs") == 0)
300 me->arch.stubs_section = i;
396
397bool module_init_section(const char *name)
398{
399 /* We don't handle .init for the moment: always return false. */
400 return false;
401}
402
403int module_frob_arch_sections(Elf64_Ehdr *hdr,
404 Elf64_Shdr *sechdrs,
405 char *secstrings,
406 struct module *me)
407{
408 unsigned int i;
409
410 /* Find .toc and .stubs sections, symtab and strtab */
411 for (i = 1; i < hdr->e_shnum; i++) {
412 if (strcmp(secstrings + sechdrs[i].sh_name, ".stubs") == 0)
413 me->arch.stubs_section = i;
414#ifdef CONFIG_PPC_KERNEL_PCREL
415 else if (strcmp(secstrings + sechdrs[i].sh_name, ".data..percpu") == 0)
416 me->arch.pcpu_section = i;
417 else if (strcmp(secstrings + sechdrs[i].sh_name, ".mygot") == 0) {
418 me->arch.got_section = i;
419 if (sechdrs[i].sh_addralign < 8)
420 sechdrs[i].sh_addralign = 8;
421 }
422#else
301 else if (strcmp(secstrings + sechdrs[i].sh_name, ".toc") == 0) {
302 me->arch.toc_section = i;
303 if (sechdrs[i].sh_addralign < 8)
304 sechdrs[i].sh_addralign = 8;
305 }
306 else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0)
307 dedotify_versions((void *)hdr + sechdrs[i].sh_offset,
308 sechdrs[i].sh_size);
309
310 if (sechdrs[i].sh_type == SHT_SYMTAB)
311 dedotify((void *)hdr + sechdrs[i].sh_offset,
312 sechdrs[i].sh_size / sizeof(Elf64_Sym),
313 (void *)hdr
314 + sechdrs[sechdrs[i].sh_link].sh_offset);
423 else if (strcmp(secstrings + sechdrs[i].sh_name, ".toc") == 0) {
424 me->arch.toc_section = i;
425 if (sechdrs[i].sh_addralign < 8)
426 sechdrs[i].sh_addralign = 8;
427 }
428 else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0)
429 dedotify_versions((void *)hdr + sechdrs[i].sh_offset,
430 sechdrs[i].sh_size);
431
432 if (sechdrs[i].sh_type == SHT_SYMTAB)
433 dedotify((void *)hdr + sechdrs[i].sh_offset,
434 sechdrs[i].sh_size / sizeof(Elf64_Sym),
435 (void *)hdr
436 + sechdrs[sechdrs[i].sh_link].sh_offset);
437#endif
315 }
316
317 if (!me->arch.stubs_section) {
318 pr_err("%s: doesn't contain .stubs.\n", me->name);
319 return -ENOEXEC;
320 }
321
438 }
439
440 if (!me->arch.stubs_section) {
441 pr_err("%s: doesn't contain .stubs.\n", me->name);
442 return -ENOEXEC;
443 }
444
445#ifdef CONFIG_PPC_KERNEL_PCREL
446 if (!me->arch.got_section) {
447 pr_err("%s: doesn't contain .mygot.\n", me->name);
448 return -ENOEXEC;
449 }
450
451 /* Override the got size */
452 sechdrs[me->arch.got_section].sh_size = get_got_size(hdr, sechdrs, me);
453#else
322 /* If we don't have a .toc, just use .stubs. We need to set r2
323 to some reasonable value in case the module calls out to
324 other functions via a stub, or if a function pointer escapes
325 the module by some means. */
326 if (!me->arch.toc_section)
327 me->arch.toc_section = me->arch.stubs_section;
454 /* If we don't have a .toc, just use .stubs. We need to set r2
455 to some reasonable value in case the module calls out to
456 other functions via a stub, or if a function pointer escapes
457 the module by some means. */
458 if (!me->arch.toc_section)
459 me->arch.toc_section = me->arch.stubs_section;
460#endif
328
329 /* Override the stubs size */
330 sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs);
461
462 /* Override the stubs size */
463 sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs);
464
331 return 0;
332}
333
334#ifdef CONFIG_MPROFILE_KERNEL
335
336static u32 stub_insns[] = {
337#ifdef CONFIG_PPC_KERNEL_PCREL
338 PPC_RAW_LD(_R12, _R13, offsetof(struct paca_struct, kernelbase)),

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440/*
441 * r2 is the TOC pointer: it actually points 0x8000 into the TOC (this gives the
442 * value maximum span in an instruction which uses a signed offset). Round down
443 * to a 256 byte boundary for the odd case where we are setting up r2 without a
444 * .toc section.
445 */
446static inline unsigned long my_r2(const Elf64_Shdr *sechdrs, struct module *me)
447{
465 return 0;
466}
467
468#ifdef CONFIG_MPROFILE_KERNEL
469
470static u32 stub_insns[] = {
471#ifdef CONFIG_PPC_KERNEL_PCREL
472 PPC_RAW_LD(_R12, _R13, offsetof(struct paca_struct, kernelbase)),

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574/*
575 * r2 is the TOC pointer: it actually points 0x8000 into the TOC (this gives the
576 * value maximum span in an instruction which uses a signed offset). Round down
577 * to a 256 byte boundary for the odd case where we are setting up r2 without a
578 * .toc section.
579 */
580static inline unsigned long my_r2(const Elf64_Shdr *sechdrs, struct module *me)
581{
582#ifndef CONFIG_PPC_KERNEL_PCREL
448 return (sechdrs[me->arch.toc_section].sh_addr & ~0xfful) + 0x8000;
583 return (sechdrs[me->arch.toc_section].sh_addr & ~0xfful) + 0x8000;
584#else
585 return -1;
586#endif
449}
450
451/* Patch stub to reference function and correct r2 value. */
452static inline int create_stub(const Elf64_Shdr *sechdrs,
453 struct ppc64_stub_entry *entry,
454 unsigned long addr,
455 struct module *me,
456 const char *name)
457{
458 long reladdr;
459 func_desc_t desc;
460 int i;
461
462 if (is_mprofile_ftrace_call(name))
463 return create_ftrace_stub(entry, addr, me);
464
587}
588
589/* Patch stub to reference function and correct r2 value. */
590static inline int create_stub(const Elf64_Shdr *sechdrs,
591 struct ppc64_stub_entry *entry,
592 unsigned long addr,
593 struct module *me,
594 const char *name)
595{
596 long reladdr;
597 func_desc_t desc;
598 int i;
599
600 if (is_mprofile_ftrace_call(name))
601 return create_ftrace_stub(entry, addr, me);
602
603 if ((unsigned long)entry->jump % 8 != 0) {
604 pr_err("%s: Address of stub entry is not 8-byte aligned\n", me->name);
605 return 0;
606 }
607
608 BUILD_BUG_ON(sizeof(ppc64_stub_insns) > sizeof(entry->jump));
465 for (i = 0; i < ARRAY_SIZE(ppc64_stub_insns); i++) {
466 if (patch_instruction(&entry->jump[i],
467 ppc_inst(ppc64_stub_insns[i])))
468 return 0;
469 }
470
609 for (i = 0; i < ARRAY_SIZE(ppc64_stub_insns); i++) {
610 if (patch_instruction(&entry->jump[i],
611 ppc_inst(ppc64_stub_insns[i])))
612 return 0;
613 }
614
471 /* Stub uses address relative to r2. */
472 reladdr = (unsigned long)entry - my_r2(sechdrs, me);
473 if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
474 pr_err("%s: Address %p of stub out of range of %p.\n",
475 me->name, (void *)reladdr, (void *)my_r2);
476 return 0;
477 }
478 pr_debug("Stub %p get data from reladdr %li\n", entry, reladdr);
615 if (IS_ENABLED(CONFIG_PPC_KERNEL_PCREL)) {
616 /* Stub uses address relative to itself! */
617 reladdr = 0 + offsetof(struct ppc64_stub_entry, funcdata);
618 BUILD_BUG_ON(reladdr != 32);
619 if (reladdr > 0x1FFFFFFFFL || reladdr < -0x200000000L) {
620 pr_err("%s: Address of %p out of range of 34-bit relative address.\n",
621 me->name, (void *)reladdr);
622 return 0;
623 }
624 pr_debug("Stub %p get data from reladdr %li\n", entry, reladdr);
479
625
480 if (patch_instruction(&entry->jump[0],
481 ppc_inst(entry->jump[0] | PPC_HA(reladdr))))
482 return 0;
626 /* May not even need this if we're relative to 0 */
627 if (patch_instruction(&entry->jump[0],
628 ppc_inst_prefix(entry->jump[0] | IMM_H18(reladdr),
629 entry->jump[1] | IMM_L(reladdr))))
630 return 0;
483
631
484 if (patch_instruction(&entry->jump[1],
485 ppc_inst(entry->jump[1] | PPC_LO(reladdr))))
486 return 0;
632 } else {
633 /* Stub uses address relative to r2. */
634 reladdr = (unsigned long)entry - my_r2(sechdrs, me);
635 if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
636 pr_err("%s: Address %p of stub out of range of %p.\n",
637 me->name, (void *)reladdr, (void *)my_r2);
638 return 0;
639 }
640 pr_debug("Stub %p get data from reladdr %li\n", entry, reladdr);
487
641
642 if (patch_instruction(&entry->jump[0],
643 ppc_inst(entry->jump[0] | PPC_HA(reladdr))))
644 return 0;
645
646 if (patch_instruction(&entry->jump[1],
647 ppc_inst(entry->jump[1] | PPC_LO(reladdr))))
648 return 0;
649 }
650
488 // func_desc_t is 8 bytes if ABIv2, else 16 bytes
489 desc = func_desc(addr);
490 for (i = 0; i < sizeof(func_desc_t) / sizeof(u32); i++) {
491 if (patch_instruction(((u32 *)&entry->funcdata) + i,
492 ppc_inst(((u32 *)(&desc))[i])))
493 return 0;
494 }
495

--- 26 unchanged lines hidden (view full) ---

522 }
523
524 if (!create_stub(sechdrs, &stubs[i], addr, me, name))
525 return 0;
526
527 return (unsigned long)&stubs[i];
528}
529
651 // func_desc_t is 8 bytes if ABIv2, else 16 bytes
652 desc = func_desc(addr);
653 for (i = 0; i < sizeof(func_desc_t) / sizeof(u32); i++) {
654 if (patch_instruction(((u32 *)&entry->funcdata) + i,
655 ppc_inst(((u32 *)(&desc))[i])))
656 return 0;
657 }
658

--- 26 unchanged lines hidden (view full) ---

685 }
686
687 if (!create_stub(sechdrs, &stubs[i], addr, me, name))
688 return 0;
689
690 return (unsigned long)&stubs[i];
691}
692
693#ifdef CONFIG_PPC_KERNEL_PCREL
694/* Create GOT to load the location described in this ptr */
695static unsigned long got_for_addr(const Elf64_Shdr *sechdrs,
696 unsigned long addr,
697 struct module *me,
698 const char *name)
699{
700 struct ppc64_got_entry *got;
701 unsigned int i, num_got;
702
703 if (!IS_ENABLED(CONFIG_PPC_KERNEL_PCREL))
704 return addr;
705
706 num_got = sechdrs[me->arch.got_section].sh_size / sizeof(*got);
707
708 /* Find this stub, or if that fails, the next avail. entry */
709 got = (void *)sechdrs[me->arch.got_section].sh_addr;
710 for (i = 0; got[i].addr; i++) {
711 if (WARN_ON(i >= num_got))
712 return 0;
713
714 if (got[i].addr == addr)
715 return (unsigned long)&got[i];
716 }
717
718 got[i].addr = addr;
719
720 return (unsigned long)&got[i];
721}
722#endif
723
530/* We expect a noop next: if it is, replace it with instruction to
531 restore r2. */
532static int restore_r2(const char *name, u32 *instruction, struct module *me)
533{
534 u32 *prev_insn = instruction - 1;
535 u32 insn_val = *instruction;
536
724/* We expect a noop next: if it is, replace it with instruction to
725 restore r2. */
726static int restore_r2(const char *name, u32 *instruction, struct module *me)
727{
728 u32 *prev_insn = instruction - 1;
729 u32 insn_val = *instruction;
730
731 if (IS_ENABLED(CONFIG_PPC_KERNEL_PCREL))
732 return 0;
733
537 if (is_mprofile_ftrace_call(name))
538 return 0;
539
540 /*
541 * Make sure the branch isn't a sibling call. Sibling calls aren't
542 * "link" branches and they don't return, so they don't need the r2
543 * restore afterwards.
544 */

--- 29 unchanged lines hidden (view full) ---

574 Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr;
575 Elf64_Sym *sym;
576 unsigned long *location;
577 unsigned long value;
578
579 pr_debug("Applying ADD relocate section %u to %u\n", relsec,
580 sechdrs[relsec].sh_info);
581
734 if (is_mprofile_ftrace_call(name))
735 return 0;
736
737 /*
738 * Make sure the branch isn't a sibling call. Sibling calls aren't
739 * "link" branches and they don't return, so they don't need the r2
740 * restore afterwards.
741 */

--- 29 unchanged lines hidden (view full) ---

771 Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr;
772 Elf64_Sym *sym;
773 unsigned long *location;
774 unsigned long value;
775
776 pr_debug("Applying ADD relocate section %u to %u\n", relsec,
777 sechdrs[relsec].sh_info);
778
779#ifndef CONFIG_PPC_KERNEL_PCREL
582 /* First time we're called, we can fix up .TOC. */
583 if (!me->arch.toc_fixed) {
584 sym = find_dot_toc(sechdrs, strtab, symindex);
585 /* It's theoretically possible that a module doesn't want a
586 * .TOC. so don't fail it just for that. */
587 if (sym)
588 sym->st_value = my_r2(sechdrs, me);
589 me->arch.toc_fixed = true;
590 }
780 /* First time we're called, we can fix up .TOC. */
781 if (!me->arch.toc_fixed) {
782 sym = find_dot_toc(sechdrs, strtab, symindex);
783 /* It's theoretically possible that a module doesn't want a
784 * .TOC. so don't fail it just for that. */
785 if (sym)
786 sym->st_value = my_r2(sechdrs, me);
787 me->arch.toc_fixed = true;
788 }
591
789#endif
592 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
593 /* This is where to make the change */
594 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
595 + rela[i].r_offset;
596 /* This is the symbol it is referring to */
597 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
598 + ELF64_R_SYM(rela[i].r_info);
599

--- 11 unchanged lines hidden (view full) ---

611 *(u32 *)location = value;
612 break;
613
614 case R_PPC64_ADDR64:
615 /* Simply set it */
616 *(unsigned long *)location = value;
617 break;
618
790 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
791 /* This is where to make the change */
792 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
793 + rela[i].r_offset;
794 /* This is the symbol it is referring to */
795 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
796 + ELF64_R_SYM(rela[i].r_info);
797

--- 11 unchanged lines hidden (view full) ---

809 *(u32 *)location = value;
810 break;
811
812 case R_PPC64_ADDR64:
813 /* Simply set it */
814 *(unsigned long *)location = value;
815 break;
816
817#ifndef CONFIG_PPC_KERNEL_PCREL
619 case R_PPC64_TOC:
620 *(unsigned long *)location = my_r2(sechdrs, me);
621 break;
622
623 case R_PPC64_TOC16:
624 /* Subtract TOC pointer */
625 value -= my_r2(sechdrs, me);
626 if (value + 0x8000 > 0xffff) {

--- 43 unchanged lines hidden (view full) ---

670 case R_PPC64_TOC16_HA:
671 /* Subtract TOC pointer */
672 value -= my_r2(sechdrs, me);
673 value = ((value + 0x8000) >> 16);
674 *((uint16_t *) location)
675 = (*((uint16_t *) location) & ~0xffff)
676 | (value & 0xffff);
677 break;
818 case R_PPC64_TOC:
819 *(unsigned long *)location = my_r2(sechdrs, me);
820 break;
821
822 case R_PPC64_TOC16:
823 /* Subtract TOC pointer */
824 value -= my_r2(sechdrs, me);
825 if (value + 0x8000 > 0xffff) {

--- 43 unchanged lines hidden (view full) ---

869 case R_PPC64_TOC16_HA:
870 /* Subtract TOC pointer */
871 value -= my_r2(sechdrs, me);
872 value = ((value + 0x8000) >> 16);
873 *((uint16_t *) location)
874 = (*((uint16_t *) location) & ~0xffff)
875 | (value & 0xffff);
876 break;
877#endif
678
679 case R_PPC_REL24:
878
879 case R_PPC_REL24:
880#ifdef CONFIG_PPC_KERNEL_PCREL
881 /* PCREL still generates REL24 for mcount */
882 case R_PPC64_REL24_NOTOC:
883#endif
680 /* FIXME: Handle weak symbols here --RR */
681 if (sym->st_shndx == SHN_UNDEF ||
682 sym->st_shndx == SHN_LIVEPATCH) {
683 /* External: go via stub */
684 value = stub_for_addr(sechdrs, value, me,
685 strtab + sym->st_name);
686 if (!value)
687 return -ENOENT;

--- 31 unchanged lines hidden (view full) ---

719 if (value + 0x80000000 > 0xffffffff) {
720 pr_err("%s: REL32 %li out of range!\n",
721 me->name, (long int)value);
722 return -ENOEXEC;
723 }
724 *(u32 *)location = value;
725 break;
726
884 /* FIXME: Handle weak symbols here --RR */
885 if (sym->st_shndx == SHN_UNDEF ||
886 sym->st_shndx == SHN_LIVEPATCH) {
887 /* External: go via stub */
888 value = stub_for_addr(sechdrs, value, me,
889 strtab + sym->st_name);
890 if (!value)
891 return -ENOENT;

--- 31 unchanged lines hidden (view full) ---

923 if (value + 0x80000000 > 0xffffffff) {
924 pr_err("%s: REL32 %li out of range!\n",
925 me->name, (long int)value);
926 return -ENOEXEC;
927 }
928 *(u32 *)location = value;
929 break;
930
931#ifdef CONFIG_PPC_KERNEL_PCREL
932 case R_PPC64_PCREL34: {
933 unsigned long absvalue = value;
934
935 /* Convert value to relative */
936 value -= (unsigned long)location;
937
938 if (value + 0x200000000 > 0x3ffffffff) {
939 if (sym->st_shndx != me->arch.pcpu_section) {
940 pr_err("%s: REL34 %li out of range!\n",
941 me->name, (long)value);
942 return -ENOEXEC;
943 }
944
945 /*
946 * per-cpu section is special cased because
947 * it is moved during loading, so has to be
948 * converted to use GOT.
949 */
950 value = got_for_addr(sechdrs, absvalue, me,
951 strtab + sym->st_name);
952 if (!value)
953 return -ENOENT;
954 value -= (unsigned long)location;
955
956 /* Turn pla into pld */
957 if (patch_instruction((u32 *)location,
958 ppc_inst_prefix((*(u32 *)location & ~0x02000000),
959 (*((u32 *)location + 1) & ~0xf8000000) | 0xe4000000)))
960 return -EFAULT;
961 }
962
963 if (patch_instruction((u32 *)location,
964 ppc_inst_prefix((*(u32 *)location & ~0x3ffff) | IMM_H18(value),
965 (*((u32 *)location + 1) & ~0xffff) | IMM_L(value))))
966 return -EFAULT;
967
968 break;
969 }
970
971#else
727 case R_PPC64_TOCSAVE:
728 /*
729 * Marker reloc indicates we don't have to save r2.
730 * That would only save us one instruction, so ignore
731 * it.
732 */
733 break;
972 case R_PPC64_TOCSAVE:
973 /*
974 * Marker reloc indicates we don't have to save r2.
975 * That would only save us one instruction, so ignore
976 * it.
977 */
978 break;
979#endif
734
735 case R_PPC64_ENTRY:
980
981 case R_PPC64_ENTRY:
982 if (IS_ENABLED(CONFIG_PPC_KERNEL_PCREL))
983 break;
984
736 /*
737 * Optimize ELFv2 large code model entry point if
738 * the TOC is within 2GB range of current location.
739 */
740 value = my_r2(sechdrs, me) - (unsigned long)location;
741 if (value + 0x80008000 > 0xffffffff)
742 break;
743 /*

--- 26 unchanged lines hidden (view full) ---

770 case R_PPC64_REL16_LO:
771 /* Subtract location pointer */
772 value -= (unsigned long)location;
773 *((uint16_t *) location)
774 = (*((uint16_t *) location) & ~0xffff)
775 | (value & 0xffff);
776 break;
777
985 /*
986 * Optimize ELFv2 large code model entry point if
987 * the TOC is within 2GB range of current location.
988 */
989 value = my_r2(sechdrs, me) - (unsigned long)location;
990 if (value + 0x80008000 > 0xffffffff)
991 break;
992 /*

--- 26 unchanged lines hidden (view full) ---

1019 case R_PPC64_REL16_LO:
1020 /* Subtract location pointer */
1021 value -= (unsigned long)location;
1022 *((uint16_t *) location)
1023 = (*((uint16_t *) location) & ~0xffff)
1024 | (value & 0xffff);
1025 break;
1026
1027#ifdef CONFIG_PPC_KERNEL_PCREL
1028 case R_PPC64_GOT_PCREL34:
1029 value = got_for_addr(sechdrs, value, me,
1030 strtab + sym->st_name);
1031 if (!value)
1032 return -ENOENT;
1033 value -= (unsigned long)location;
1034 ((uint32_t *)location)[0] = (((uint32_t *)location)[0] & ~0x3ffff) |
1035 ((value >> 16) & 0x3ffff);
1036 ((uint32_t *)location)[1] = (((uint32_t *)location)[1] & ~0xffff) |
1037 (value & 0xffff);
1038 break;
1039#endif
1040
778 default:
779 pr_err("%s: Unknown ADD relocation: %lu\n",
780 me->name,
781 (unsigned long)ELF64_R_TYPE(rela[i].r_info));
782 return -ENOEXEC;
783 }
784 }
785

--- 61 unchanged lines hidden --- 		1041 default:
1042 pr_err("%s: Unknown ADD relocation: %lu\n",
1043 me->name,
1044 (unsigned long)ELF64_R_TYPE(rela[i].r_info));
1045 return -ENOEXEC;
1046 }
1047 }
1048

--- 61 unchanged lines hidden ---