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146 lines
4.2 KiB
146 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
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*/ |
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#include <linux/module.h> |
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#include <linux/moduleloader.h> |
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#include <linux/kernel.h> |
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#include <linux/elf.h> |
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#include <linux/vmalloc.h> |
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#include <linux/slab.h> |
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#include <linux/fs.h> |
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#include <linux/string.h> |
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#include <asm/unwind.h> |
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static inline void arc_write_me(unsigned short *addr, unsigned long value) |
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{ |
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*addr = (value & 0xffff0000) >> 16; |
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*(addr + 1) = (value & 0xffff); |
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} |
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/* |
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* This gets called before relocation loop in generic loader |
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* Make a note of the section index of unwinding section |
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*/ |
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int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, |
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char *secstr, struct module *mod) |
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{ |
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#ifdef CONFIG_ARC_DW2_UNWIND |
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mod->arch.unw_sec_idx = 0; |
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mod->arch.unw_info = NULL; |
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#endif |
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mod->arch.secstr = secstr; |
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return 0; |
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} |
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void module_arch_cleanup(struct module *mod) |
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{ |
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#ifdef CONFIG_ARC_DW2_UNWIND |
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if (mod->arch.unw_info) |
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unwind_remove_table(mod->arch.unw_info, 0); |
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#endif |
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} |
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int apply_relocate_add(Elf32_Shdr *sechdrs, |
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const char *strtab, |
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unsigned int symindex, /* sec index for sym tbl */ |
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unsigned int relsec, /* sec index for relo sec */ |
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struct module *module) |
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{ |
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int i, n, relo_type; |
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Elf32_Rela *rel_entry = (void *)sechdrs[relsec].sh_addr; |
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Elf32_Sym *sym_entry, *sym_sec; |
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Elf32_Addr relocation, location, tgt_addr; |
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unsigned int tgtsec; |
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/* |
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* @relsec has relocations e.g. .rela.init.text |
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* @tgtsec is section to patch e.g. .init.text |
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*/ |
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tgtsec = sechdrs[relsec].sh_info; |
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tgt_addr = sechdrs[tgtsec].sh_addr; |
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sym_sec = (Elf32_Sym *) sechdrs[symindex].sh_addr; |
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n = sechdrs[relsec].sh_size / sizeof(*rel_entry); |
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pr_debug("\nSection to fixup %s @%x\n", |
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module->arch.secstr + sechdrs[tgtsec].sh_name, tgt_addr); |
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pr_debug("=========================================================\n"); |
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pr_debug("r_off\tr_add\tst_value ADDRESS VALUE\n"); |
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pr_debug("=========================================================\n"); |
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/* Loop thru entries in relocation section */ |
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for (i = 0; i < n; i++) { |
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const char *s; |
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/* This is where to make the change */ |
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location = tgt_addr + rel_entry[i].r_offset; |
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/* This is the symbol it is referring to. Note that all |
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undefined symbols have been resolved. */ |
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sym_entry = sym_sec + ELF32_R_SYM(rel_entry[i].r_info); |
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relocation = sym_entry->st_value + rel_entry[i].r_addend; |
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if (sym_entry->st_name == 0 && ELF_ST_TYPE (sym_entry->st_info) == STT_SECTION) { |
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s = module->arch.secstr + sechdrs[sym_entry->st_shndx].sh_name; |
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} else { |
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s = strtab + sym_entry->st_name; |
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} |
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pr_debug(" %x\t%x\t%x %x %x [%s]\n", |
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rel_entry[i].r_offset, rel_entry[i].r_addend, |
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sym_entry->st_value, location, relocation, s); |
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/* This assumes modules are built with -mlong-calls |
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* so any branches/jumps are absolute 32 bit jmps |
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* global data access again is abs 32 bit. |
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* Both of these are handled by same relocation type |
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*/ |
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relo_type = ELF32_R_TYPE(rel_entry[i].r_info); |
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if (likely(R_ARC_32_ME == relo_type)) /* ME ( S + A ) */ |
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arc_write_me((unsigned short *)location, relocation); |
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else if (R_ARC_32 == relo_type) /* ( S + A ) */ |
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*((Elf32_Addr *) location) = relocation; |
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else if (R_ARC_32_PCREL == relo_type) /* ( S + A ) - PDATA ) */ |
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*((Elf32_Addr *) location) = relocation - location; |
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else |
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goto relo_err; |
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} |
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#ifdef CONFIG_ARC_DW2_UNWIND |
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if (strcmp(module->arch.secstr+sechdrs[tgtsec].sh_name, ".eh_frame") == 0) |
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module->arch.unw_sec_idx = tgtsec; |
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#endif |
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return 0; |
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relo_err: |
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pr_err("%s: unknown relocation: %u\n", |
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module->name, ELF32_R_TYPE(rel_entry[i].r_info)); |
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return -ENOEXEC; |
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} |
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/* Just before lift off: After sections have been relocated, we add the |
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* dwarf section to unwinder table pool |
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* This couldn't be done in module_frob_arch_sections() because |
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* relocations had not been applied by then |
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*/ |
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int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, |
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struct module *mod) |
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{ |
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#ifdef CONFIG_ARC_DW2_UNWIND |
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void *unw; |
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int unwsec = mod->arch.unw_sec_idx; |
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if (unwsec) { |
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unw = unwind_add_table(mod, (void *)sechdrs[unwsec].sh_addr, |
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sechdrs[unwsec].sh_size); |
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mod->arch.unw_info = unw; |
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} |
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#endif |
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return 0; |
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}
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