1 /* Kernel module help for PPC64.
2 Copyright (C) 2001, 2003 Rusty Russell IBM Corporation.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/module.h>
22 #include <linux/elf.h>
23 #include <linux/moduleloader.h>
24 #include <linux/err.h>
25 #include <linux/vmalloc.h>
26 #include <linux/ftrace.h>
27 #include <linux/bug.h>
28 #include <linux/uaccess.h>
29 #include <asm/module.h>
30 #include <asm/firmware.h>
31 #include <asm/code-patching.h>
32 #include <linux/sort.h>
33 #include <asm/setup.h>
34 #include <asm/sections.h>
36 /* FIXME: We don't do .init separately. To do this, we'd need to have
37 a separate r2 value in the init and core section, and stub between
40 Using a magic allocator which places modules within 32MB solves
41 this, and makes other things simpler. Anton?
44 #ifdef PPC64_ELF_ABI_v2
46 /* An address is simply the address of the function. */
47 typedef unsigned long func_desc_t;
49 static func_desc_t func_desc(unsigned long addr)
53 static unsigned long func_addr(unsigned long addr)
57 static unsigned long stub_func_addr(func_desc_t func)
62 /* PowerPC64 specific values for the Elf64_Sym st_other field. */
63 #define STO_PPC64_LOCAL_BIT 5
64 #define STO_PPC64_LOCAL_MASK (7 << STO_PPC64_LOCAL_BIT)
65 #define PPC64_LOCAL_ENTRY_OFFSET(other) \
66 (((1 << (((other) & STO_PPC64_LOCAL_MASK) >> STO_PPC64_LOCAL_BIT)) >> 2) << 2)
68 static unsigned int local_entry_offset(const Elf64_Sym *sym)
70 /* sym->st_other indicates offset to local entry point
71 * (otherwise it will assume r12 is the address of the start
72 * of function and try to derive r2 from it). */
73 return PPC64_LOCAL_ENTRY_OFFSET(sym->st_other);
77 /* An address is address of the OPD entry, which contains address of fn. */
78 typedef struct ppc64_opd_entry func_desc_t;
80 static func_desc_t func_desc(unsigned long addr)
82 return *(struct ppc64_opd_entry *)addr;
84 static unsigned long func_addr(unsigned long addr)
86 return func_desc(addr).funcaddr;
88 static unsigned long stub_func_addr(func_desc_t func)
92 static unsigned int local_entry_offset(const Elf64_Sym *sym)
97 void *dereference_module_function_descriptor(struct module *mod, void *ptr)
99 if (ptr < (void *)mod->arch.start_opd ||
100 ptr >= (void *)mod->arch.end_opd)
103 return dereference_function_descriptor(ptr);
107 #define STUB_MAGIC 0x73747562 /* stub */
109 /* Like PPC32, we need little trampolines to do > 24-bit jumps (into
110 the kernel itself). But on PPC64, these need to be used for every
111 jump, actually, to reset r2 (TOC+0x8000). */
112 struct ppc64_stub_entry
114 /* 28 byte jump instruction sequence (7 instructions). We only
115 * need 6 instructions on ABIv2 but we always allocate 7 so
116 * so we don't have to modify the trampoline load instruction. */
118 /* Used by ftrace to identify stubs */
120 /* Data for the above code */
121 func_desc_t funcdata;
125 * PPC64 uses 24 bit jumps, but we need to jump into other modules or
126 * the kernel which may be further. So we jump to a stub.
128 * For ELFv1 we need to use this to set up the new r2 value (aka TOC
129 * pointer). For ELFv2 it's the callee's responsibility to set up the
130 * new r2, but for both we need to save the old r2.
132 * We could simply patch the new r2 value and function pointer into
133 * the stub, but it's significantly shorter to put these values at the
134 * end of the stub code, and patch the stub address (32-bits relative
135 * to the TOC ptr, r2) into the stub.
138 static u32 ppc64_stub_insns[] = {
139 0x3d620000, /* addis r11,r2, <high> */
140 0x396b0000, /* addi r11,r11, <low> */
141 /* Save current r2 value in magic place on the stack. */
142 0xf8410000|R2_STACK_OFFSET, /* std r2,R2_STACK_OFFSET(r1) */
143 0xe98b0020, /* ld r12,32(r11) */
144 #ifdef PPC64_ELF_ABI_v1
145 /* Set up new r2 from function descriptor */
146 0xe84b0028, /* ld r2,40(r11) */
148 0x7d8903a6, /* mtctr r12 */
149 0x4e800420 /* bctr */
152 #ifdef CONFIG_DYNAMIC_FTRACE
153 int module_trampoline_target(struct module *mod, unsigned long addr,
154 unsigned long *target)
156 struct ppc64_stub_entry *stub;
157 func_desc_t funcdata;
160 if (!within_module_core(addr, mod)) {
161 pr_err("%s: stub %lx not in module %s\n", __func__, addr, mod->name);
165 stub = (struct ppc64_stub_entry *)addr;
167 if (probe_kernel_read(&magic, &stub->magic, sizeof(magic))) {
168 pr_err("%s: fault reading magic for stub %lx for %s\n", __func__, addr, mod->name);
172 if (magic != STUB_MAGIC) {
173 pr_err("%s: bad magic for stub %lx for %s\n", __func__, addr, mod->name);
177 if (probe_kernel_read(&funcdata, &stub->funcdata, sizeof(funcdata))) {
178 pr_err("%s: fault reading funcdata for stub %lx for %s\n", __func__, addr, mod->name);
182 *target = stub_func_addr(funcdata);
188 /* Count how many different 24-bit relocations (different symbol,
190 static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num)
192 unsigned int i, r_info, r_addend, _count_relocs;
194 /* FIXME: Only count external ones --RR */
198 for (i = 0; i < num; i++)
199 /* Only count 24-bit relocs, others don't need stubs */
200 if (ELF64_R_TYPE(rela[i].r_info) == R_PPC_REL24 &&
201 (r_info != ELF64_R_SYM(rela[i].r_info) ||
202 r_addend != rela[i].r_addend)) {
204 r_info = ELF64_R_SYM(rela[i].r_info);
205 r_addend = rela[i].r_addend;
208 return _count_relocs;
211 static int relacmp(const void *_x, const void *_y)
213 const Elf64_Rela *x, *y;
215 y = (Elf64_Rela *)_x;
216 x = (Elf64_Rela *)_y;
218 /* Compare the entire r_info (as opposed to ELF64_R_SYM(r_info) only) to
219 * make the comparison cheaper/faster. It won't affect the sorting or
220 * the counting algorithms' performance
222 if (x->r_info < y->r_info)
224 else if (x->r_info > y->r_info)
226 else if (x->r_addend < y->r_addend)
228 else if (x->r_addend > y->r_addend)
234 static void relaswap(void *_x, void *_y, int size)
236 uint64_t *x, *y, tmp;
242 for (i = 0; i < sizeof(Elf64_Rela) / sizeof(uint64_t); i++) {
249 /* Get size of potential trampolines required. */
250 static unsigned long get_stubs_size(const Elf64_Ehdr *hdr,
251 const Elf64_Shdr *sechdrs)
253 /* One extra reloc so it's always 0-funcaddr terminated */
254 unsigned long relocs = 1;
257 /* Every relocated section... */
258 for (i = 1; i < hdr->e_shnum; i++) {
259 if (sechdrs[i].sh_type == SHT_RELA) {
260 pr_debug("Found relocations in section %u\n", i);
261 pr_debug("Ptr: %p. Number: %Lu\n",
262 (void *)sechdrs[i].sh_addr,
263 sechdrs[i].sh_size / sizeof(Elf64_Rela));
265 /* Sort the relocation information based on a symbol and
266 * addend key. This is a stable O(n*log n) complexity
267 * alogrithm but it will reduce the complexity of
268 * count_relocs() to linear complexity O(n)
270 sort((void *)sechdrs[i].sh_addr,
271 sechdrs[i].sh_size / sizeof(Elf64_Rela),
272 sizeof(Elf64_Rela), relacmp, relaswap);
274 relocs += count_relocs((void *)sechdrs[i].sh_addr,
276 / sizeof(Elf64_Rela));
280 #ifdef CONFIG_DYNAMIC_FTRACE
281 /* make the trampoline to the ftrace_caller */
283 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
284 /* an additional one for ftrace_regs_caller */
289 pr_debug("Looks like a total of %lu stubs, max\n", relocs);
290 return relocs * sizeof(struct ppc64_stub_entry);
293 /* Still needed for ELFv2, for .TOC. */
294 static void dedotify_versions(struct modversion_info *vers,
297 struct modversion_info *end;
299 for (end = (void *)vers + size; vers < end; vers++)
300 if (vers->name[0] == '.') {
301 memmove(vers->name, vers->name+1, strlen(vers->name));
306 * Undefined symbols which refer to .funcname, hack to funcname. Make .TOC.
307 * seem to be defined (value set later).
309 static void dedotify(Elf64_Sym *syms, unsigned int numsyms, char *strtab)
313 for (i = 1; i < numsyms; i++) {
314 if (syms[i].st_shndx == SHN_UNDEF) {
315 char *name = strtab + syms[i].st_name;
316 if (name[0] == '.') {
317 if (strcmp(name+1, "TOC.") == 0)
318 syms[i].st_shndx = SHN_ABS;
325 static Elf64_Sym *find_dot_toc(Elf64_Shdr *sechdrs,
327 unsigned int symindex)
329 unsigned int i, numsyms;
332 syms = (Elf64_Sym *)sechdrs[symindex].sh_addr;
333 numsyms = sechdrs[symindex].sh_size / sizeof(Elf64_Sym);
335 for (i = 1; i < numsyms; i++) {
336 if (syms[i].st_shndx == SHN_ABS
337 && strcmp(strtab + syms[i].st_name, "TOC.") == 0)
343 int module_frob_arch_sections(Elf64_Ehdr *hdr,
350 /* Find .toc and .stubs sections, symtab and strtab */
351 for (i = 1; i < hdr->e_shnum; i++) {
353 if (strcmp(secstrings + sechdrs[i].sh_name, ".stubs") == 0)
354 me->arch.stubs_section = i;
355 else if (strcmp(secstrings + sechdrs[i].sh_name, ".toc") == 0) {
356 me->arch.toc_section = i;
357 if (sechdrs[i].sh_addralign < 8)
358 sechdrs[i].sh_addralign = 8;
360 else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0)
361 dedotify_versions((void *)hdr + sechdrs[i].sh_offset,
364 /* We don't handle .init for the moment: rename to _init */
365 while ((p = strstr(secstrings + sechdrs[i].sh_name, ".init")))
368 if (sechdrs[i].sh_type == SHT_SYMTAB)
369 dedotify((void *)hdr + sechdrs[i].sh_offset,
370 sechdrs[i].sh_size / sizeof(Elf64_Sym),
372 + sechdrs[sechdrs[i].sh_link].sh_offset);
375 if (!me->arch.stubs_section) {
376 pr_err("%s: doesn't contain .stubs.\n", me->name);
380 /* If we don't have a .toc, just use .stubs. We need to set r2
381 to some reasonable value in case the module calls out to
382 other functions via a stub, or if a function pointer escapes
383 the module by some means. */
384 if (!me->arch.toc_section)
385 me->arch.toc_section = me->arch.stubs_section;
387 /* Override the stubs size */
388 sechdrs[me->arch.stubs_section].sh_size = get_stubs_size(hdr, sechdrs);
393 * r2 is the TOC pointer: it actually points 0x8000 into the TOC (this gives the
394 * value maximum span in an instruction which uses a signed offset). Round down
395 * to a 256 byte boundary for the odd case where we are setting up r2 without a
398 static inline unsigned long my_r2(const Elf64_Shdr *sechdrs, struct module *me)
400 return (sechdrs[me->arch.toc_section].sh_addr & ~0xfful) + 0x8000;
403 /* Both low and high 16 bits are added as SIGNED additions, so if low
404 16 bits has high bit set, high 16 bits must be adjusted. These
405 macros do that (stolen from binutils). */
406 #define PPC_LO(v) ((v) & 0xffff)
407 #define PPC_HI(v) (((v) >> 16) & 0xffff)
408 #define PPC_HA(v) PPC_HI ((v) + 0x8000)
410 /* Patch stub to reference function and correct r2 value. */
411 static inline int create_stub(const Elf64_Shdr *sechdrs,
412 struct ppc64_stub_entry *entry,
418 memcpy(entry->jump, ppc64_stub_insns, sizeof(ppc64_stub_insns));
420 /* Stub uses address relative to r2. */
421 reladdr = (unsigned long)entry - my_r2(sechdrs, me);
422 if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
423 pr_err("%s: Address %p of stub out of range of %p.\n",
424 me->name, (void *)reladdr, (void *)my_r2);
427 pr_debug("Stub %p get data from reladdr %li\n", entry, reladdr);
429 entry->jump[0] |= PPC_HA(reladdr);
430 entry->jump[1] |= PPC_LO(reladdr);
431 entry->funcdata = func_desc(addr);
432 entry->magic = STUB_MAGIC;
437 /* Create stub to jump to function described in this OPD/ptr: we need the
438 stub to set up the TOC ptr (r2) for the function. */
439 static unsigned long stub_for_addr(const Elf64_Shdr *sechdrs,
443 struct ppc64_stub_entry *stubs;
444 unsigned int i, num_stubs;
446 num_stubs = sechdrs[me->arch.stubs_section].sh_size / sizeof(*stubs);
448 /* Find this stub, or if that fails, the next avail. entry */
449 stubs = (void *)sechdrs[me->arch.stubs_section].sh_addr;
450 for (i = 0; stub_func_addr(stubs[i].funcdata); i++) {
451 if (WARN_ON(i >= num_stubs))
454 if (stub_func_addr(stubs[i].funcdata) == func_addr(addr))
455 return (unsigned long)&stubs[i];
458 if (!create_stub(sechdrs, &stubs[i], addr, me))
461 return (unsigned long)&stubs[i];
464 #ifdef CONFIG_MPROFILE_KERNEL
465 static bool is_mprofile_mcount_callsite(const char *name, u32 *instruction)
467 if (strcmp("_mcount", name))
471 * Check if this is one of the -mprofile-kernel sequences.
473 if (instruction[-1] == PPC_INST_STD_LR &&
474 instruction[-2] == PPC_INST_MFLR)
477 if (instruction[-1] == PPC_INST_MFLR)
484 * In case of _mcount calls, do not save the current callee's TOC (in r2) into
485 * the original caller's stack frame. If we did we would clobber the saved TOC
486 * value of the original caller.
488 static void squash_toc_save_inst(const char *name, unsigned long addr)
490 struct ppc64_stub_entry *stub = (struct ppc64_stub_entry *)addr;
492 /* Only for calls to _mcount */
493 if (strcmp("_mcount", name) != 0)
496 stub->jump[2] = PPC_INST_NOP;
499 static void squash_toc_save_inst(const char *name, unsigned long addr) { }
501 static bool is_mprofile_mcount_callsite(const char *name, u32 *instruction)
507 /* We expect a noop next: if it is, replace it with instruction to
509 static int restore_r2(const char *name, u32 *instruction, struct module *me)
511 u32 *prev_insn = instruction - 1;
513 if (is_mprofile_mcount_callsite(name, prev_insn))
517 * Make sure the branch isn't a sibling call. Sibling calls aren't
518 * "link" branches and they don't return, so they don't need the r2
519 * restore afterwards.
521 if (!instr_is_relative_link_branch(*prev_insn))
524 if (*instruction != PPC_INST_NOP) {
525 pr_err("%s: Expected nop after call, got %08x at %pS\n",
526 me->name, *instruction, instruction);
529 /* ld r2,R2_STACK_OFFSET(r1) */
530 *instruction = PPC_INST_LD_TOC;
534 int apply_relocate_add(Elf64_Shdr *sechdrs,
536 unsigned int symindex,
541 Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr;
543 unsigned long *location;
546 pr_debug("Applying ADD relocate section %u to %u\n", relsec,
547 sechdrs[relsec].sh_info);
549 /* First time we're called, we can fix up .TOC. */
550 if (!me->arch.toc_fixed) {
551 sym = find_dot_toc(sechdrs, strtab, symindex);
552 /* It's theoretically possible that a module doesn't want a
553 * .TOC. so don't fail it just for that. */
555 sym->st_value = my_r2(sechdrs, me);
556 me->arch.toc_fixed = true;
559 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
560 /* This is where to make the change */
561 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
563 /* This is the symbol it is referring to */
564 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
565 + ELF64_R_SYM(rela[i].r_info);
567 pr_debug("RELOC at %p: %li-type as %s (0x%lx) + %li\n",
568 location, (long)ELF64_R_TYPE(rela[i].r_info),
569 strtab + sym->st_name, (unsigned long)sym->st_value,
570 (long)rela[i].r_addend);
572 /* `Everything is relative'. */
573 value = sym->st_value + rela[i].r_addend;
575 switch (ELF64_R_TYPE(rela[i].r_info)) {
578 *(u32 *)location = value;
583 *(unsigned long *)location = value;
587 *(unsigned long *)location = my_r2(sechdrs, me);
591 /* Subtract TOC pointer */
592 value -= my_r2(sechdrs, me);
593 if (value + 0x8000 > 0xffff) {
594 pr_err("%s: bad TOC16 relocation (0x%lx)\n",
598 *((uint16_t *) location)
599 = (*((uint16_t *) location) & ~0xffff)
603 case R_PPC64_TOC16_LO:
604 /* Subtract TOC pointer */
605 value -= my_r2(sechdrs, me);
606 *((uint16_t *) location)
607 = (*((uint16_t *) location) & ~0xffff)
611 case R_PPC64_TOC16_DS:
612 /* Subtract TOC pointer */
613 value -= my_r2(sechdrs, me);
614 if ((value & 3) != 0 || value + 0x8000 > 0xffff) {
615 pr_err("%s: bad TOC16_DS relocation (0x%lx)\n",
619 *((uint16_t *) location)
620 = (*((uint16_t *) location) & ~0xfffc)
624 case R_PPC64_TOC16_LO_DS:
625 /* Subtract TOC pointer */
626 value -= my_r2(sechdrs, me);
627 if ((value & 3) != 0) {
628 pr_err("%s: bad TOC16_LO_DS relocation (0x%lx)\n",
632 *((uint16_t *) location)
633 = (*((uint16_t *) location) & ~0xfffc)
637 case R_PPC64_TOC16_HA:
638 /* Subtract TOC pointer */
639 value -= my_r2(sechdrs, me);
640 value = ((value + 0x8000) >> 16);
641 *((uint16_t *) location)
642 = (*((uint16_t *) location) & ~0xffff)
647 /* FIXME: Handle weak symbols here --RR */
648 if (sym->st_shndx == SHN_UNDEF ||
649 sym->st_shndx == SHN_LIVEPATCH) {
650 /* External: go via stub */
651 value = stub_for_addr(sechdrs, value, me);
654 if (!restore_r2(strtab + sym->st_name,
655 (u32 *)location + 1, me))
658 squash_toc_save_inst(strtab + sym->st_name, value);
660 value += local_entry_offset(sym);
662 /* Convert value to relative */
663 value -= (unsigned long)location;
664 if (value + 0x2000000 > 0x3ffffff || (value & 3) != 0){
665 pr_err("%s: REL24 %li out of range!\n",
666 me->name, (long int)value);
670 /* Only replace bits 2 through 26 */
671 *(uint32_t *)location
672 = (*(uint32_t *)location & ~0x03fffffc)
673 | (value & 0x03fffffc);
677 /* 64 bits relative (used by features fixups) */
678 *location = value - (unsigned long)location;
682 /* 32 bits relative (used by relative exception tables) */
683 /* Convert value to relative */
684 value -= (unsigned long)location;
685 if (value + 0x80000000 > 0xffffffff) {
686 pr_err("%s: REL32 %li out of range!\n",
687 me->name, (long int)value);
690 *(u32 *)location = value;
693 case R_PPC64_TOCSAVE:
695 * Marker reloc indicates we don't have to save r2.
696 * That would only save us one instruction, so ignore
703 * Optimize ELFv2 large code model entry point if
704 * the TOC is within 2GB range of current location.
706 value = my_r2(sechdrs, me) - (unsigned long)location;
707 if (value + 0x80008000 > 0xffffffff)
710 * Check for the large code model prolog sequence:
714 if ((((uint32_t *)location)[0] & ~0xfffc)
717 if (((uint32_t *)location)[1] != 0x7c426214)
720 * If found, replace it with:
721 * addis r2, r12, (.TOC.-func)@ha
722 * addi r2, r12, (.TOC.-func)@l
724 ((uint32_t *)location)[0] = 0x3c4c0000 + PPC_HA(value);
725 ((uint32_t *)location)[1] = 0x38420000 + PPC_LO(value);
728 case R_PPC64_REL16_HA:
729 /* Subtract location pointer */
730 value -= (unsigned long)location;
731 value = ((value + 0x8000) >> 16);
732 *((uint16_t *) location)
733 = (*((uint16_t *) location) & ~0xffff)
737 case R_PPC64_REL16_LO:
738 /* Subtract location pointer */
739 value -= (unsigned long)location;
740 *((uint16_t *) location)
741 = (*((uint16_t *) location) & ~0xffff)
746 pr_err("%s: Unknown ADD relocation: %lu\n",
748 (unsigned long)ELF64_R_TYPE(rela[i].r_info));
756 #ifdef CONFIG_DYNAMIC_FTRACE
758 #ifdef CONFIG_MPROFILE_KERNEL
760 #define PACATOC offsetof(struct paca_struct, kernel_toc)
763 * For mprofile-kernel we use a special stub for ftrace_caller() because we
764 * can't rely on r2 containing this module's TOC when we enter the stub.
766 * That can happen if the function calling us didn't need to use the toc. In
767 * that case it won't have setup r2, and the r2 value will be either the
768 * kernel's toc, or possibly another modules toc.
770 * To deal with that this stub uses the kernel toc, which is always accessible
771 * via the paca (in r13). The target (ftrace_caller()) is responsible for
772 * saving and restoring the toc before returning.
774 static unsigned long create_ftrace_stub(const Elf64_Shdr *sechdrs,
775 struct module *me, unsigned long addr)
777 struct ppc64_stub_entry *entry;
778 unsigned int i, num_stubs;
779 static u32 stub_insns[] = {
780 0xe98d0000 | PACATOC, /* ld r12,PACATOC(r13) */
781 0x3d8c0000, /* addis r12,r12,<high> */
782 0x398c0000, /* addi r12,r12,<low> */
783 0x7d8903a6, /* mtctr r12 */
784 0x4e800420, /* bctr */
788 num_stubs = sechdrs[me->arch.stubs_section].sh_size / sizeof(*entry);
790 /* Find the next available stub entry */
791 entry = (void *)sechdrs[me->arch.stubs_section].sh_addr;
792 for (i = 0; i < num_stubs && stub_func_addr(entry->funcdata); i++, entry++);
794 if (i >= num_stubs) {
795 pr_err("%s: Unable to find a free slot for ftrace stub.\n", me->name);
799 memcpy(entry->jump, stub_insns, sizeof(stub_insns));
801 /* Stub uses address relative to kernel toc (from the paca) */
802 reladdr = addr - kernel_toc_addr();
803 if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
804 pr_err("%s: Address of %ps out of range of kernel_toc.\n",
805 me->name, (void *)addr);
809 entry->jump[1] |= PPC_HA(reladdr);
810 entry->jump[2] |= PPC_LO(reladdr);
812 /* Eventhough we don't use funcdata in the stub, it's needed elsewhere. */
813 entry->funcdata = func_desc(addr);
814 entry->magic = STUB_MAGIC;
816 return (unsigned long)entry;
819 static unsigned long create_ftrace_stub(const Elf64_Shdr *sechdrs,
820 struct module *me, unsigned long addr)
822 return stub_for_addr(sechdrs, addr, me);
826 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
828 mod->arch.tramp = create_ftrace_stub(sechdrs, mod,
829 (unsigned long)ftrace_caller);
830 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
831 mod->arch.tramp_regs = create_ftrace_stub(sechdrs, mod,
832 (unsigned long)ftrace_regs_caller);
833 if (!mod->arch.tramp_regs)
837 if (!mod->arch.tramp)