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objtool: Add elf_create_section_pair()
When creating an annotation section, allocate the reloc section data at the beginning. This simplifies the data model a bit and also saves memory due to the removal of malloc() in elf_rebuild_reloc_section(). With allyesconfig + CONFIG_DEBUG_INFO: - Before: peak heap memory consumption: 53.49G - After: peak heap memory consumption: 49.02G Link: https://lore.kernel.org/r/048e908f3ede9b66c15e44672b6dda992b1dae3e.1685464332.git.jpoimboe@kernel.org Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Josh Poimboeuf
parent
ff4082730c
commit
6342a20efb
@ -1,10 +1,13 @@
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _OBJTOOL_ARCH_ELF
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#define _OBJTOOL_ARCH_ELF
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#define R_NONE R_PPC_NONE
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#define R_ABS64 R_PPC64_ADDR64
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#define R_ABS32 R_PPC_ADDR32
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#define R_NONE R_PPC_NONE
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#define R_ABS64 R_PPC64_ADDR64
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#define R_ABS32 R_PPC_ADDR32
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#define R_DATA32 R_PPC_REL32
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#define R_DATA64 R_PPC64_REL64
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#define R_TEXT32 R_PPC_REL32
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#define R_TEXT64 R_PPC64_REL32
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#endif /* _OBJTOOL_ARCH_ELF */
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@ -1,8 +1,13 @@
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _OBJTOOL_ARCH_ELF
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#define _OBJTOOL_ARCH_ELF
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#define R_NONE R_X86_64_NONE
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#define R_ABS64 R_X86_64_64
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#define R_ABS32 R_X86_64_32
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#define R_NONE R_X86_64_NONE
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#define R_ABS32 R_X86_64_32
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#define R_ABS64 R_X86_64_64
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#define R_DATA32 R_X86_64_PC32
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#define R_DATA64 R_X86_64_PC32
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#define R_TEXT32 R_X86_64_PC32
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#define R_TEXT64 R_X86_64_PC32
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#endif /* _OBJTOOL_ARCH_ELF */
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@ -8,7 +8,6 @@
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#include <inttypes.h>
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#include <sys/mman.h>
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#include <arch/elf.h>
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#include <objtool/builtin.h>
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#include <objtool/cfi.h>
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#include <objtool/arch.h>
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@ -656,8 +655,8 @@ reachable:
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static int create_static_call_sections(struct objtool_file *file)
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{
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struct section *sec;
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struct static_call_site *site;
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struct section *sec;
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struct instruction *insn;
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struct symbol *key_sym;
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char *key_name, *tmp;
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@ -677,25 +676,21 @@ static int create_static_call_sections(struct objtool_file *file)
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list_for_each_entry(insn, &file->static_call_list, call_node)
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idx++;
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sec = elf_create_section(file->elf, ".static_call_sites",
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sizeof(struct static_call_site), idx);
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sec = elf_create_section_pair(file->elf, ".static_call_sites",
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sizeof(*site), idx, idx * 2);
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if (!sec)
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return -1;
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/* Allow modules to set the low bits of static_call_site::key */
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/* Allow modules to modify the low bits of static_call_site::key */
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sec->sh.sh_flags |= SHF_WRITE;
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idx = 0;
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list_for_each_entry(insn, &file->static_call_list, call_node) {
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site = (struct static_call_site *)sec->data->d_buf + idx;
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memset(site, 0, sizeof(struct static_call_site));
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/* populate reloc for 'addr' */
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if (elf_add_reloc_to_insn(file->elf, sec,
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idx * sizeof(struct static_call_site),
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R_X86_64_PC32,
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insn->sec, insn->offset))
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if (!elf_init_reloc_text_sym(file->elf, sec,
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idx * sizeof(*site), idx * 2,
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insn->sec, insn->offset))
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return -1;
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/* find key symbol */
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@ -735,10 +730,10 @@ static int create_static_call_sections(struct objtool_file *file)
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free(key_name);
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/* populate reloc for 'key' */
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if (elf_add_reloc(file->elf, sec,
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idx * sizeof(struct static_call_site) + 4,
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R_X86_64_PC32, key_sym,
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is_sibling_call(insn) * STATIC_CALL_SITE_TAIL))
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if (!elf_init_reloc_data_sym(file->elf, sec,
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idx * sizeof(*site) + 4,
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(idx * 2) + 1, key_sym,
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is_sibling_call(insn) * STATIC_CALL_SITE_TAIL))
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return -1;
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idx++;
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@ -766,26 +761,18 @@ static int create_retpoline_sites_sections(struct objtool_file *file)
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if (!idx)
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return 0;
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sec = elf_create_section(file->elf, ".retpoline_sites",
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sizeof(int), idx);
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if (!sec) {
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WARN("elf_create_section: .retpoline_sites");
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sec = elf_create_section_pair(file->elf, ".retpoline_sites",
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sizeof(int), idx, idx);
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if (!sec)
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return -1;
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}
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idx = 0;
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list_for_each_entry(insn, &file->retpoline_call_list, call_node) {
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int *site = (int *)sec->data->d_buf + idx;
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*site = 0;
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if (elf_add_reloc_to_insn(file->elf, sec,
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idx * sizeof(int),
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R_X86_64_PC32,
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insn->sec, insn->offset)) {
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WARN("elf_add_reloc_to_insn: .retpoline_sites");
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if (!elf_init_reloc_text_sym(file->elf, sec,
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idx * sizeof(int), idx,
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insn->sec, insn->offset))
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return -1;
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}
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idx++;
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}
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@ -812,26 +799,18 @@ static int create_return_sites_sections(struct objtool_file *file)
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if (!idx)
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return 0;
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sec = elf_create_section(file->elf, ".return_sites",
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sizeof(int), idx);
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if (!sec) {
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WARN("elf_create_section: .return_sites");
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sec = elf_create_section_pair(file->elf, ".return_sites",
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sizeof(int), idx, idx);
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if (!sec)
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return -1;
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}
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idx = 0;
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list_for_each_entry(insn, &file->return_thunk_list, call_node) {
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int *site = (int *)sec->data->d_buf + idx;
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*site = 0;
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if (elf_add_reloc_to_insn(file->elf, sec,
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idx * sizeof(int),
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R_X86_64_PC32,
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insn->sec, insn->offset)) {
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WARN("elf_add_reloc_to_insn: .return_sites");
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if (!elf_init_reloc_text_sym(file->elf, sec,
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idx * sizeof(int), idx,
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insn->sec, insn->offset))
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return -1;
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}
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idx++;
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}
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@ -864,12 +843,10 @@ static int create_ibt_endbr_seal_sections(struct objtool_file *file)
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if (!idx)
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return 0;
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sec = elf_create_section(file->elf, ".ibt_endbr_seal",
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sizeof(int), idx);
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if (!sec) {
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WARN("elf_create_section: .ibt_endbr_seal");
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sec = elf_create_section_pair(file->elf, ".ibt_endbr_seal",
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sizeof(int), idx, idx);
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if (!sec)
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return -1;
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}
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idx = 0;
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list_for_each_entry(insn, &file->endbr_list, call_node) {
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@ -884,13 +861,10 @@ static int create_ibt_endbr_seal_sections(struct objtool_file *file)
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!strcmp(sym->name, "cleanup_module")))
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WARN("%s(): not an indirect call target", sym->name);
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if (elf_add_reloc_to_insn(file->elf, sec,
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idx * sizeof(int),
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R_X86_64_PC32,
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insn->sec, insn->offset)) {
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WARN("elf_add_reloc_to_insn: .ibt_endbr_seal");
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if (!elf_init_reloc_text_sym(file->elf, sec,
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idx * sizeof(int), idx,
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insn->sec, insn->offset))
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return -1;
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}
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idx++;
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}
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@ -902,7 +876,6 @@ static int create_cfi_sections(struct objtool_file *file)
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{
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struct section *sec;
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struct symbol *sym;
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unsigned int *loc;
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int idx;
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sec = find_section_by_name(file->elf, ".cfi_sites");
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@ -923,7 +896,8 @@ static int create_cfi_sections(struct objtool_file *file)
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idx++;
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}
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sec = elf_create_section(file->elf, ".cfi_sites", sizeof(unsigned int), idx);
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sec = elf_create_section_pair(file->elf, ".cfi_sites",
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sizeof(unsigned int), idx, idx);
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if (!sec)
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return -1;
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@ -935,13 +909,9 @@ static int create_cfi_sections(struct objtool_file *file)
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if (strncmp(sym->name, "__cfi_", 6))
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continue;
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loc = (unsigned int *)sec->data->d_buf + idx;
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memset(loc, 0, sizeof(unsigned int));
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if (elf_add_reloc_to_insn(file->elf, sec,
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idx * sizeof(unsigned int),
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R_X86_64_PC32,
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sym->sec, sym->offset))
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if (!elf_init_reloc_text_sym(file->elf, sec,
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idx * sizeof(unsigned int), idx,
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sym->sec, sym->offset))
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return -1;
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idx++;
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@ -971,7 +941,8 @@ static int create_mcount_loc_sections(struct objtool_file *file)
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list_for_each_entry(insn, &file->mcount_loc_list, call_node)
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idx++;
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sec = elf_create_section(file->elf, "__mcount_loc", addr_size, idx);
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sec = elf_create_section_pair(file->elf, "__mcount_loc", addr_size,
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idx, idx);
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if (!sec)
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return -1;
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@ -979,17 +950,17 @@ static int create_mcount_loc_sections(struct objtool_file *file)
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idx = 0;
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list_for_each_entry(insn, &file->mcount_loc_list, call_node) {
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void *loc;
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loc = sec->data->d_buf + idx;
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memset(loc, 0, addr_size);
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struct reloc *reloc;
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if (elf_add_reloc_to_insn(file->elf, sec, idx,
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addr_size == sizeof(u64) ? R_ABS64 : R_ABS32,
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insn->sec, insn->offset))
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reloc = elf_init_reloc_text_sym(file->elf, sec, idx * addr_size, idx,
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insn->sec, insn->offset);
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if (!reloc)
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return -1;
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idx += addr_size;
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reloc->type = addr_size == 8 ? R_ABS64 : R_ABS32;
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idx++;
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}
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return 0;
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@ -999,7 +970,6 @@ static int create_direct_call_sections(struct objtool_file *file)
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{
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struct instruction *insn;
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struct section *sec;
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unsigned int *loc;
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int idx;
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sec = find_section_by_name(file->elf, ".call_sites");
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@ -1016,20 +986,17 @@ static int create_direct_call_sections(struct objtool_file *file)
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list_for_each_entry(insn, &file->call_list, call_node)
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idx++;
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sec = elf_create_section(file->elf, ".call_sites", sizeof(unsigned int), idx);
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sec = elf_create_section_pair(file->elf, ".call_sites",
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sizeof(unsigned int), idx, idx);
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if (!sec)
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return -1;
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idx = 0;
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list_for_each_entry(insn, &file->call_list, call_node) {
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loc = (unsigned int *)sec->data->d_buf + idx;
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memset(loc, 0, sizeof(unsigned int));
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if (elf_add_reloc_to_insn(file->elf, sec,
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idx * sizeof(unsigned int),
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R_X86_64_PC32,
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insn->sec, insn->offset))
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if (!elf_init_reloc_text_sym(file->elf, sec,
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idx * sizeof(unsigned int), idx,
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insn->sec, insn->offset))
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return -1;
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idx++;
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@ -533,41 +533,6 @@ err:
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return -1;
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}
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static struct section *elf_create_rela_section(struct elf *elf,
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struct section *sec);
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int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
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unsigned int type, struct symbol *sym, s64 addend)
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{
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struct reloc *reloc;
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if (!sec->rsec && !elf_create_rela_section(elf, sec))
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return -1;
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reloc = malloc(sizeof(*reloc));
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if (!reloc) {
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perror("malloc");
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return -1;
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}
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memset(reloc, 0, sizeof(*reloc));
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reloc->sec = sec->rsec;
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reloc->offset = offset;
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reloc->type = type;
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reloc->sym = sym;
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reloc->addend = addend;
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list_add_tail(&reloc->sym_reloc_entry, &sym->reloc_list);
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list_add_tail(&reloc->list, &sec->rsec->reloc_list);
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elf_hash_add(reloc, &reloc->hash, reloc_hash(reloc));
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sec->rsec->sh.sh_size += sec->rsec->sh.sh_entsize;
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mark_sec_changed(elf, sec->rsec, true);
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return 0;
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}
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/*
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* Ensure that any reloc section containing references to @sym is marked
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* changed such that it will get re-generated in elf_rebuild_reloc_sections()
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@ -841,13 +806,57 @@ elf_create_prefix_symbol(struct elf *elf, struct symbol *orig, long size)
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return sym;
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}
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int elf_add_reloc_to_insn(struct elf *elf, struct section *sec,
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unsigned long offset, unsigned int type,
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struct section *insn_sec, unsigned long insn_off)
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static struct reloc *elf_init_reloc(struct elf *elf, struct section *rsec,
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unsigned int reloc_idx,
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unsigned long offset, struct symbol *sym,
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s64 addend, unsigned int type)
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{
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struct reloc *reloc;
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if (reloc_idx >= rsec->sh.sh_size / elf_rela_size(elf)) {
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WARN("%s: bad reloc_idx %u for %s with size 0x%lx",
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__func__, reloc_idx, rsec->name, rsec->sh.sh_size);
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return NULL;
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}
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reloc = malloc(sizeof(*reloc));
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if (!reloc) {
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perror("malloc");
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return NULL;
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}
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memset(reloc, 0, sizeof(*reloc));
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reloc->idx = reloc_idx;
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reloc->sec = rsec;
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reloc->offset = offset;
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reloc->type = type;
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reloc->sym = sym;
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reloc->addend = addend;
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list_add_tail(&reloc->sym_reloc_entry, &sym->reloc_list);
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list_add_tail(&reloc->list, &rsec->reloc_list);
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elf_hash_add(reloc, &reloc->hash, reloc_hash(reloc));
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mark_sec_changed(elf, rsec, true);
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return reloc;
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}
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struct reloc *elf_init_reloc_text_sym(struct elf *elf, struct section *sec,
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unsigned long offset,
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unsigned int reloc_idx,
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struct section *insn_sec,
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unsigned long insn_off)
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{
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struct symbol *sym = insn_sec->sym;
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int addend = insn_off;
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if (!(insn_sec->sh.sh_flags & SHF_EXECINSTR)) {
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WARN("bad call to %s() for data symbol %s",
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__func__, sym->name);
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return NULL;
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}
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if (!sym) {
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/*
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* Due to how weak functions work, we must use section based
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@ -857,12 +866,29 @@ int elf_add_reloc_to_insn(struct elf *elf, struct section *sec,
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*/
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sym = elf_create_section_symbol(elf, insn_sec);
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if (!sym)
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return -1;
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return NULL;
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insn_sec->sym = sym;
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}
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return elf_add_reloc(elf, sec, offset, type, sym, addend);
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return elf_init_reloc(elf, sec->rsec, reloc_idx, offset, sym, addend,
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elf_text_rela_type(elf));
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}
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struct reloc *elf_init_reloc_data_sym(struct elf *elf, struct section *sec,
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unsigned long offset,
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unsigned int reloc_idx,
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struct symbol *sym,
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s64 addend)
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{
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if (sym->sec && (sec->sh.sh_flags & SHF_EXECINSTR)) {
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WARN("bad call to %s() for text symbol %s",
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__func__, sym->name);
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return NULL;
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}
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return elf_init_reloc(elf, sec->rsec, reloc_idx, offset, sym, addend,
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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)
|
||||
@ -1048,7 +1074,7 @@ static int elf_add_string(struct elf *elf, struct section *strtab, char *str)
|
||||
}
|
||||
|
||||
struct section *elf_create_section(struct elf *elf, const char *name,
|
||||
size_t entsize, int nr)
|
||||
size_t entsize, unsigned int nr)
|
||||
{
|
||||
struct section *sec, *shstrtab;
|
||||
size_t size = entsize * nr;
|
||||
@ -1129,7 +1155,8 @@ struct section *elf_create_section(struct elf *elf, const char *name,
|
||||
}
|
||||
|
||||
static struct section *elf_create_rela_section(struct elf *elf,
|
||||
struct section *sec)
|
||||
struct section *sec,
|
||||
unsigned int reloc_nr)
|
||||
{
|
||||
struct section *rsec;
|
||||
char *rsec_name;
|
||||
@ -1142,46 +1169,50 @@ static struct section *elf_create_rela_section(struct elf *elf,
|
||||
strcpy(rsec_name, ".rela");
|
||||
strcat(rsec_name, sec->name);
|
||||
|
||||
rsec = elf_create_section(elf, rsec_name, elf_rela_size(elf), 0);
|
||||
rsec = elf_create_section(elf, rsec_name, elf_rela_size(elf), reloc_nr);
|
||||
free(rsec_name);
|
||||
if (!rsec)
|
||||
return NULL;
|
||||
|
||||
sec->rsec = rsec;
|
||||
rsec->base = sec;
|
||||
|
||||
rsec->data->d_type = ELF_T_RELA;
|
||||
rsec->sh.sh_type = SHT_RELA;
|
||||
rsec->sh.sh_addralign = elf_addr_size(elf);
|
||||
rsec->sh.sh_link = find_section_by_name(elf, ".symtab")->idx;
|
||||
rsec->sh.sh_info = sec->idx;
|
||||
rsec->sh.sh_flags = SHF_INFO_LINK;
|
||||
|
||||
sec->rsec = rsec;
|
||||
rsec->base = sec;
|
||||
|
||||
return rsec;
|
||||
}
|
||||
|
||||
struct section *elf_create_section_pair(struct elf *elf, const char *name,
|
||||
size_t entsize, unsigned int nr,
|
||||
unsigned int reloc_nr)
|
||||
{
|
||||
struct section *sec;
|
||||
|
||||
sec = elf_create_section(elf, name, entsize, nr);
|
||||
if (!sec)
|
||||
return NULL;
|
||||
|
||||
if (!elf_create_rela_section(elf, sec, reloc_nr))
|
||||
return NULL;
|
||||
|
||||
return sec;
|
||||
}
|
||||
|
||||
static int elf_rebuild_reloc_section(struct elf *elf, struct section *rsec)
|
||||
{
|
||||
bool rela = rsec->sh.sh_type == SHT_RELA;
|
||||
struct reloc *reloc;
|
||||
int idx = 0, ret;
|
||||
void *buf;
|
||||
|
||||
/* Allocate a buffer for relocations */
|
||||
buf = malloc(rsec->sh.sh_size);
|
||||
if (!buf) {
|
||||
perror("malloc");
|
||||
return -1;
|
||||
}
|
||||
|
||||
rsec->data->d_buf = buf;
|
||||
rsec->data->d_size = rsec->sh.sh_size;
|
||||
rsec->data->d_type = rela ? ELF_T_RELA : ELF_T_REL;
|
||||
|
||||
idx = 0;
|
||||
list_for_each_entry(reloc, &rsec->reloc_list, list) {
|
||||
reloc->rel.r_offset = reloc->offset;
|
||||
reloc->rel.r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
|
||||
if (rela) {
|
||||
if (rsec->sh.sh_type == SHT_RELA) {
|
||||
reloc->rela.r_addend = reloc->addend;
|
||||
ret = gelf_update_rela(rsec->data, idx, &reloc->rela);
|
||||
} else {
|
||||
|
||||
@ -111,15 +111,26 @@ struct elf {
|
||||
};
|
||||
|
||||
struct elf *elf_open_read(const char *name, int flags);
|
||||
struct section *elf_create_section(struct elf *elf, const char *name, size_t entsize, int nr);
|
||||
|
||||
struct section *elf_create_section(struct elf *elf, const char *name,
|
||||
size_t entsize, unsigned int nr);
|
||||
struct section *elf_create_section_pair(struct elf *elf, const char *name,
|
||||
size_t entsize, unsigned int nr,
|
||||
unsigned int reloc_nr);
|
||||
|
||||
struct symbol *elf_create_prefix_symbol(struct elf *elf, struct symbol *orig, long size);
|
||||
|
||||
int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
|
||||
unsigned int type, struct symbol *sym, s64 addend);
|
||||
int elf_add_reloc_to_insn(struct elf *elf, struct section *sec,
|
||||
unsigned long offset, unsigned int type,
|
||||
struct section *insn_sec, unsigned long insn_off);
|
||||
struct reloc *elf_init_reloc_text_sym(struct elf *elf, struct section *sec,
|
||||
unsigned long offset,
|
||||
unsigned int reloc_idx,
|
||||
struct section *insn_sec,
|
||||
unsigned long insn_off);
|
||||
|
||||
struct reloc *elf_init_reloc_data_sym(struct elf *elf, struct section *sec,
|
||||
unsigned long offset,
|
||||
unsigned int reloc_idx,
|
||||
struct symbol *sym,
|
||||
s64 addend);
|
||||
|
||||
int elf_write_insn(struct elf *elf, struct section *sec,
|
||||
unsigned long offset, unsigned int len,
|
||||
@ -159,6 +170,16 @@ static inline size_t elf_rela_size(struct elf *elf)
|
||||
return elf_addr_size(elf) == 4 ? sizeof(Elf32_Rela) : sizeof(Elf64_Rela);
|
||||
}
|
||||
|
||||
static inline unsigned int elf_data_rela_type(struct elf *elf)
|
||||
{
|
||||
return elf_addr_size(elf) == 4 ? R_DATA32 : R_DATA64;
|
||||
}
|
||||
|
||||
static inline unsigned int elf_text_rela_type(struct elf *elf)
|
||||
{
|
||||
return elf_addr_size(elf) == 4 ? R_TEXT32 : R_TEXT64;
|
||||
}
|
||||
|
||||
static inline bool is_reloc_sec(struct section *sec)
|
||||
{
|
||||
return sec->sh.sh_type == SHT_RELA || sec->sh.sh_type == SHT_REL;
|
||||
|
||||
@ -118,8 +118,8 @@ static int write_orc_entry(struct elf *elf, struct section *orc_sec,
|
||||
orc->bp_offset = bswap_if_needed(elf, orc->bp_offset);
|
||||
|
||||
/* populate reloc for ip */
|
||||
if (elf_add_reloc_to_insn(elf, ip_sec, idx * sizeof(int), R_X86_64_PC32,
|
||||
insn_sec, insn_off))
|
||||
if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,
|
||||
insn_sec, insn_off))
|
||||
return -1;
|
||||
|
||||
return 0;
|
||||
@ -242,7 +242,7 @@ int orc_create(struct objtool_file *file)
|
||||
if (!orc_sec)
|
||||
return -1;
|
||||
|
||||
sec = elf_create_section(file->elf, ".orc_unwind_ip", sizeof(int), nr);
|
||||
sec = elf_create_section_pair(file->elf, ".orc_unwind_ip", sizeof(int), nr, nr);
|
||||
if (!sec)
|
||||
return -1;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user