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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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objtool: Get rid of reloc->rel[a]
Get the relocation entry info from the underlying rsec->data. With allyesconfig + CONFIG_DEBUG_INFO: - Before: peak heap memory consumption: 35.12G - After: peak heap memory consumption: 29.93G Link: https://lore.kernel.org/r/2be32323de6d8cc73179ee0ff14b71f4e7cefaa0.1685464332.git.jpoimboe@kernel.org Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Josh Poimboeuf
parent
02b5400106
commit
ec24b927c1
@ -968,7 +968,7 @@ static int create_mcount_loc_sections(struct objtool_file *file)
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if (!reloc)
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return -1;
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set_reloc_type(reloc, addr_size == 8 ? R_ABS64 : R_ABS32);
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set_reloc_type(file->elf, reloc, addr_size == 8 ? R_ABS64 : R_ABS32);
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idx++;
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}
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@ -1363,10 +1363,8 @@ static void annotate_call_site(struct objtool_file *file,
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* noinstr text.
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*/
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if (opts.hack_noinstr && insn->sec->noinstr && sym->profiling_func) {
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if (reloc) {
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set_reloc_type(reloc, R_NONE);
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elf_write_reloc(file->elf, reloc);
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}
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if (reloc)
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set_reloc_type(file->elf, reloc, R_NONE);
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elf_write_insn(file->elf, insn->sec,
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insn->offset, insn->len,
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@ -1392,10 +1390,8 @@ static void annotate_call_site(struct objtool_file *file,
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if (sibling)
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WARN_INSN(insn, "tail call to __fentry__ !?!?");
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if (opts.mnop) {
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if (reloc) {
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set_reloc_type(reloc, R_NONE);
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elf_write_reloc(file->elf, reloc);
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}
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if (reloc)
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set_reloc_type(file->elf, reloc, R_NONE);
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elf_write_insn(file->elf, insn->sec,
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insn->offset, insn->len,
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@ -1874,10 +1870,8 @@ static int handle_jump_alt(struct objtool_file *file,
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if (opts.hack_jump_label && special_alt->key_addend & 2) {
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struct reloc *reloc = insn_reloc(file, orig_insn);
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if (reloc) {
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set_reloc_type(reloc, R_NONE);
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elf_write_reloc(file->elf, reloc);
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}
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if (reloc)
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set_reloc_type(file->elf, reloc, R_NONE);
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elf_write_insn(file->elf, orig_insn->sec,
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orig_insn->offset, orig_insn->len,
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arch_nop_insn(orig_insn->len));
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@ -575,11 +575,8 @@ static int elf_update_sym_relocs(struct elf *elf, struct symbol *sym)
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{
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struct reloc *reloc;
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for (reloc = sym->relocs; reloc; reloc = reloc->sym_next_reloc) {
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reloc->rel.r_info = GELF_R_INFO(reloc->sym->idx, reloc_type(reloc));
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if (elf_write_reloc(elf, reloc))
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return -1;
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}
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for (reloc = sym->relocs; reloc; reloc = reloc->sym_next_reloc)
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set_reloc_sym(elf, reloc, reloc->sym->idx);
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return 0;
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}
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@ -869,12 +866,10 @@ static struct reloc *elf_init_reloc(struct elf *elf, struct section *rsec,
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reloc->sec = rsec;
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reloc->sym = sym;
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reloc->rel.r_offset = offset;
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reloc->rel.r_info = GELF_R_INFO(sym->idx, type);
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reloc->rela.r_addend = addend;
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if (elf_write_reloc(elf, reloc))
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return NULL;
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set_reloc_offset(elf, reloc, offset);
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set_reloc_sym(elf, reloc, sym->idx);
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set_reloc_type(elf, reloc, type);
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set_reloc_addend(elf, reloc, addend);
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elf_hash_add(reloc, &reloc->hash, reloc_hash(reloc));
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reloc->sym_next_reloc = sym->relocs;
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@ -932,24 +927,6 @@ struct reloc *elf_init_reloc_data_sym(struct elf *elf, struct section *sec,
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elf_data_rela_type(elf));
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}
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static int read_reloc(struct section *rsec, int i, struct reloc *reloc)
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{
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bool rela = rsec->sh.sh_type == SHT_RELA;
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void *retp;
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if (rela)
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retp = gelf_getrela(rsec->data, i, &reloc->rela);
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else
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retp = gelf_getrel(rsec->data, i, &reloc->rel);
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if (!retp) {
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WARN_ELF("gelf_getrela");
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return -1;
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}
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return 0;
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}
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static int read_relocs(struct elf *elf)
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{
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unsigned long nr_reloc, max_reloc = 0;
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@ -984,11 +961,8 @@ static int read_relocs(struct elf *elf)
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for (i = 0; i < sec_num_entries(rsec); i++) {
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reloc = &rsec->relocs[i];
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if (read_reloc(rsec, i, reloc))
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return -1;
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reloc->sec = rsec;
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symndx = GELF_R_SYM(reloc->rel.r_info);
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symndx = reloc_sym(reloc);
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reloc->sym = sym = find_symbol_by_index(elf, symndx);
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if (!reloc->sym) {
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WARN("can't find reloc entry symbol %d for %s",
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@ -1261,26 +1235,6 @@ int elf_write_insn(struct elf *elf, struct section *sec,
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return 0;
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}
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int elf_write_reloc(struct elf *elf, struct reloc *reloc)
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{
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struct section *rsec = reloc->sec;
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int ret;
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if (rsec->sh.sh_type == SHT_RELA)
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ret = gelf_update_rela(rsec->data, reloc_idx(reloc), &reloc->rela);
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else
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ret = gelf_update_rel(rsec->data, reloc_idx(reloc), &reloc->rel);
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if (!ret) {
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WARN_ELF("gelf_update_rela");
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return -1;
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}
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mark_sec_changed(elf, rsec, true);
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return 0;
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}
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/*
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* When Elf_Scn::sh_size is smaller than the combined Elf_Data::d_size
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* do you:
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@ -72,10 +72,6 @@ struct symbol {
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struct reloc {
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struct elf_hash_node hash;
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union {
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GElf_Rela rela;
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GElf_Rel rel;
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};
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struct section *sec;
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struct symbol *sym;
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struct reloc *sym_next_reloc;
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@ -132,7 +128,6 @@ struct reloc *elf_init_reloc_data_sym(struct elf *elf, struct section *sec,
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int elf_write_insn(struct elf *elf, struct section *sec,
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unsigned long offset, unsigned int len,
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const char *insn);
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int elf_write_reloc(struct elf *elf, struct reloc *reloc);
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int elf_write(struct elf *elf);
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void elf_close(struct elf *elf);
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@ -204,24 +199,99 @@ static inline unsigned int reloc_idx(struct reloc *reloc)
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return reloc - reloc->sec->relocs;
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}
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static inline unsigned long reloc_offset(struct reloc *reloc)
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static inline void *reloc_rel(struct reloc *reloc)
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{
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return reloc->rel.r_offset;
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struct section *rsec = reloc->sec;
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return rsec->data->d_buf + (reloc_idx(reloc) * rsec->sh.sh_entsize);
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}
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static inline unsigned int reloc_type(struct reloc *reloc)
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static inline bool is_32bit_reloc(struct reloc *reloc)
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{
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return GELF_R_TYPE(reloc->rel.r_info);
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/*
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* Elf32_Rel: 8 bytes
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* Elf32_Rela: 12 bytes
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* Elf64_Rel: 16 bytes
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* Elf64_Rela: 24 bytes
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*/
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return reloc->sec->sh.sh_entsize < 16;
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}
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static inline void set_reloc_type(struct reloc *reloc, int type)
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#define __get_reloc_field(reloc, field) \
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({ \
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is_32bit_reloc(reloc) ? \
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((Elf32_Rela *)reloc_rel(reloc))->field : \
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((Elf64_Rela *)reloc_rel(reloc))->field; \
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})
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#define __set_reloc_field(reloc, field, val) \
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({ \
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if (is_32bit_reloc(reloc)) \
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((Elf32_Rela *)reloc_rel(reloc))->field = val; \
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else \
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((Elf64_Rela *)reloc_rel(reloc))->field = val; \
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})
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static inline u64 reloc_offset(struct reloc *reloc)
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{
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reloc->rel.r_info = GELF_R_INFO(GELF_R_SYM(reloc->rel.r_info), type);
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return __get_reloc_field(reloc, r_offset);
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}
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static inline void set_reloc_offset(struct elf *elf, struct reloc *reloc, u64 offset)
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{
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__set_reloc_field(reloc, r_offset, offset);
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mark_sec_changed(elf, reloc->sec, true);
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}
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static inline s64 reloc_addend(struct reloc *reloc)
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{
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return reloc->rela.r_addend;
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return __get_reloc_field(reloc, r_addend);
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}
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static inline void set_reloc_addend(struct elf *elf, struct reloc *reloc, s64 addend)
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{
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__set_reloc_field(reloc, r_addend, addend);
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mark_sec_changed(elf, reloc->sec, true);
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}
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static inline unsigned int reloc_sym(struct reloc *reloc)
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{
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u64 info = __get_reloc_field(reloc, r_info);
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return is_32bit_reloc(reloc) ?
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ELF32_R_SYM(info) :
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ELF64_R_SYM(info);
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}
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static inline unsigned int reloc_type(struct reloc *reloc)
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{
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u64 info = __get_reloc_field(reloc, r_info);
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return is_32bit_reloc(reloc) ?
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ELF32_R_TYPE(info) :
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ELF64_R_TYPE(info);
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}
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static inline void set_reloc_sym(struct elf *elf, struct reloc *reloc, unsigned int sym)
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{
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u64 info = is_32bit_reloc(reloc) ?
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ELF32_R_INFO(sym, reloc_type(reloc)) :
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ELF64_R_INFO(sym, reloc_type(reloc));
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__set_reloc_field(reloc, r_info, info);
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mark_sec_changed(elf, reloc->sec, true);
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}
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static inline void set_reloc_type(struct elf *elf, struct reloc *reloc, unsigned int type)
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{
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u64 info = is_32bit_reloc(reloc) ?
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ELF32_R_INFO(reloc_sym(reloc), type) :
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ELF64_R_INFO(reloc_sym(reloc), type);
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__set_reloc_field(reloc, r_info, info);
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mark_sec_changed(elf, reloc->sec, true);
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}
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#define for_each_sec(file, sec) \
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