Release 4.14 arch/arc/kernel/module.c
/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/moduleloader.h>
#include <linux/kernel.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <asm/unwind.h>
static inline void arc_write_me(unsigned short *addr, unsigned long value)
{
*addr = (value & 0xffff0000) >> 16;
*(addr + 1) = (value & 0xffff);
}
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/*
* This gets called before relocation loop in generic loader
* Make a note of the section index of unwinding section
*/
int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
char *secstr, struct module *mod)
{
#ifdef CONFIG_ARC_DW2_UNWIND
mod->arch.unw_sec_idx = 0;
mod->arch.unw_info = NULL;
#endif
mod->arch.secstr = secstr;
return 0;
}
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void module_arch_cleanup(struct module *mod)
{
#ifdef CONFIG_ARC_DW2_UNWIND
if (mod->arch.unw_info)
unwind_remove_table(mod->arch.unw_info, 0);
#endif
}
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int apply_relocate_add(Elf32_Shdr *sechdrs,
const char *strtab,
unsigned int symindex, /* sec index for sym tbl */
unsigned int relsec, /* sec index for relo sec */
struct module *module)
{
int i, n, relo_type;
Elf32_Rela *rel_entry = (void *)sechdrs[relsec].sh_addr;
Elf32_Sym *sym_entry, *sym_sec;
Elf32_Addr relocation, location, tgt_addr;
unsigned int tgtsec;
/*
* @relsec has relocations e.g. .rela.init.text
* @tgtsec is section to patch e.g. .init.text
*/
tgtsec = sechdrs[relsec].sh_info;
tgt_addr = sechdrs[tgtsec].sh_addr;
sym_sec = (Elf32_Sym *) sechdrs[symindex].sh_addr;
n = sechdrs[relsec].sh_size / sizeof(*rel_entry);
pr_debug("\nSection to fixup %s @%x\n",
module->arch.secstr + sechdrs[tgtsec].sh_name, tgt_addr);
pr_debug("=========================================================\n");
pr_debug("r_off\tr_add\tst_value ADDRESS VALUE\n");
pr_debug("=========================================================\n");
/* Loop thru entries in relocation section */
for (i = 0; i < n; i++) {
const char *s;
/* This is where to make the change */
location = tgt_addr + rel_entry[i].r_offset;
/* This is the symbol it is referring to. Note that all
undefined symbols have been resolved. */
sym_entry = sym_sec + ELF32_R_SYM(rel_entry[i].r_info);
relocation = sym_entry->st_value + rel_entry[i].r_addend;
if (sym_entry->st_name == 0 && ELF_ST_TYPE (sym_entry->st_info) == STT_SECTION) {
s = module->arch.secstr + sechdrs[sym_entry->st_shndx].sh_name;
} else {
s = strtab + sym_entry->st_name;
}
pr_debug(" %x\t%x\t%x %x %x [%s]\n",
rel_entry[i].r_offset, rel_entry[i].r_addend,
sym_entry->st_value, location, relocation, s);
/* This assumes modules are built with -mlong-calls
* so any branches/jumps are absolute 32 bit jmps
* global data access again is abs 32 bit.
* Both of these are handled by same relocation type
*/
relo_type = ELF32_R_TYPE(rel_entry[i].r_info);
if (likely(R_ARC_32_ME == relo_type)) /* ME ( S + A ) */
arc_write_me((unsigned short *)location, relocation);
else if (R_ARC_32 == relo_type) /* ( S + A ) */
*((Elf32_Addr *) location) = relocation;
else if (R_ARC_32_PCREL == relo_type) /* ( S + A ) - PDATA ) */
*((Elf32_Addr *) location) = relocation - location;
else
goto relo_err;
}
#ifdef CONFIG_ARC_DW2_UNWIND
if (strcmp(module->arch.secstr+sechdrs[tgtsec].sh_name, ".eh_frame") == 0)
module->arch.unw_sec_idx = tgtsec;
#endif
return 0;
relo_err:
pr_err("%s: unknown relocation: %u\n",
module->name, ELF32_R_TYPE(rel_entry[i].r_info));
return -ENOEXEC;
}
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/* Just before lift off: After sections have been relocated, we add the
* dwarf section to unwinder table pool
* This couldn't be done in module_frob_arch_sections() because
* relocations had not been applied by then
*/
int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
struct module *mod)
{
#ifdef CONFIG_ARC_DW2_UNWIND
void *unw;
int unwsec = mod->arch.unw_sec_idx;
if (unwsec) {
unw = unwind_add_table(mod, (void *)sechdrs[unwsec].sh_addr,
sechdrs[unwsec].sh_size);
mod->arch.unw_info = unw;
}
#endif
return 0;
}
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