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objtool: Get rid of reloc->addend

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Get the addend from the embedded GElf_Rel[a] struct.

With allyesconfig + CONFIG_DEBUG_INFO:

- Before: peak heap memory consumption: 42.10G
- After:  peak heap memory consumption: 40.37G

Link: https://lore.kernel.org/r/ad2354f95d9ddd86094e3f7687acfa0750657784.1685464332.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
This commit is contained in:
Josh Poimboeuf 2023-05-30 10:21:08 -07:00
parent fcee899d27
commit 0696b6e314
6 changed files with 53 additions and 42 deletions
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4
tools/objtool/arch/x86/decode.c
View File

@ -623,11 +623,11 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
if (!immr || strcmp(immr->sym->name, "pv_ops"))
break;
idx = (immr->addend + 8) / sizeof(void *);
idx = (reloc_addend(immr) + 8) / sizeof(void *);
func = disp->sym;
if (disp->sym->type == STT_SECTION)
func = find_symbol_by_offset(disp->sym->sec, disp->addend);
func = find_symbol_by_offset(disp->sym->sec, reloc_addend(disp));
if (!func) {
WARN("no func for pv_ops[]");
return -1;

2
tools/objtool/arch/x86/special.c
View File

@ -105,7 +105,7 @@ struct reloc *arch_find_switch_table(struct objtool_file *file,
!text_reloc->sym->sec->rodata)
return NULL;
table_offset = text_reloc->addend;
table_offset = reloc_addend(text_reloc);
table_sec = text_reloc->sym->sec;
if (reloc_type(text_reloc) == R_X86_64_PC32)

69
tools/objtool/check.c
View File

@ -509,7 +509,8 @@ static int add_pv_ops(struct objtool_file *file, const char *symname)
func = reloc->sym;
if (func->type == STT_SECTION)
func = find_symbol_by_offset(reloc->sym->sec, reloc->addend);
func = find_symbol_by_offset(reloc->sym->sec,
reloc_addend(reloc));
idx = (reloc_offset(reloc) - sym->offset) / sizeof(unsigned long);
@ -583,6 +584,7 @@ static int add_dead_ends(struct objtool_file *file)
struct section *rsec;
struct reloc *reloc;
struct instruction *insn;
s64 addend;
/*
* Check for manually annotated dead ends.
@ -592,23 +594,27 @@ static int add_dead_ends(struct objtool_file *file)
goto reachable;
for_each_reloc(rsec, reloc) {
if (reloc->sym->type != STT_SECTION) {
WARN("unexpected relocation symbol type in %s", rsec->name);
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
addend = reloc_addend(reloc);
insn = find_insn(file, reloc->sym->sec, addend);
if (insn)
insn = prev_insn_same_sec(file, insn);
else if (reloc->addend == reloc->sym->sec->sh.sh_size) {
else if (addend == reloc->sym->sec->sh.sh_size) {
insn = find_last_insn(file, reloc->sym->sec);
if (!insn) {
WARN("can't find unreachable insn at %s+0x%" PRIx64,
reloc->sym->sec->name, reloc->addend);
reloc->sym->sec->name, addend);
return -1;
}
} else {
WARN("can't find unreachable insn at %s+0x%" PRIx64,
reloc->sym->sec->name, reloc->addend);
reloc->sym->sec->name, addend);
return -1;
}
@ -627,23 +633,27 @@ reachable:
return 0;
for_each_reloc(rsec, reloc) {
if (reloc->sym->type != STT_SECTION) {
WARN("unexpected relocation symbol type in %s", rsec->name);
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
addend = reloc_addend(reloc);
insn = find_insn(file, reloc->sym->sec, addend);
if (insn)
insn = prev_insn_same_sec(file, insn);
else if (reloc->addend == reloc->sym->sec->sh.sh_size) {
else if (addend == reloc->sym->sec->sh.sh_size) {
insn = find_last_insn(file, reloc->sym->sec);
if (!insn) {
WARN("can't find reachable insn at %s+0x%" PRIx64,
reloc->sym->sec->name, reloc->addend);
reloc->sym->sec->name, addend);
return -1;
}
} else {
WARN("can't find reachable insn at %s+0x%" PRIx64,
reloc->sym->sec->name, reloc->addend);
reloc->sym->sec->name, addend);
return -1;
}
@ -1026,7 +1036,7 @@ static void add_ignores(struct objtool_file *file)
break;
case STT_SECTION:
func = find_func_by_offset(reloc->sym->sec, reloc->addend);
func = find_func_by_offset(reloc->sym->sec, reloc_addend(reloc));
if (!func)
continue;
break;
@ -1266,7 +1276,7 @@ static int add_ignore_alternatives(struct objtool_file *file)
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!insn) {
WARN("bad .discard.ignore_alts entry");
return -1;
@ -1542,7 +1552,7 @@ static int add_jump_destinations(struct objtool_file *file)
dest_off = arch_jump_destination(insn);
} else if (reloc->sym->type == STT_SECTION) {
dest_sec = reloc->sym->sec;
dest_off = arch_dest_reloc_offset(reloc->addend);
dest_off = arch_dest_reloc_offset(reloc_addend(reloc));
} else if (reloc->sym->retpoline_thunk) {
add_retpoline_call(file, insn);
continue;
@ -1559,7 +1569,7 @@ static int add_jump_destinations(struct objtool_file *file)
} else if (reloc->sym->sec->idx) {
dest_sec = reloc->sym->sec;
dest_off = reloc->sym->sym.st_value +
arch_dest_reloc_offset(reloc->addend);
arch_dest_reloc_offset(reloc_addend(reloc));
} else {
/* non-func asm code jumping to another file */
continue;
@ -1676,7 +1686,7 @@ static int add_call_destinations(struct objtool_file *file)
}
} else if (reloc->sym->type == STT_SECTION) {
dest_off = arch_dest_reloc_offset(reloc->addend);
dest_off = arch_dest_reloc_offset(reloc_addend(reloc));
dest = find_call_destination(reloc->sym->sec, dest_off);
if (!dest) {
WARN_INSN(insn, "can't find call dest symbol at %s+0x%lx",
@ -2003,10 +2013,10 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn,
/* Detect function pointers from contiguous objects: */
if (reloc->sym->sec == pfunc->sec &&
reloc->addend == pfunc->offset)
reloc_addend(reloc) == pfunc->offset)
break;
dest_insn = find_insn(file, reloc->sym->sec, reloc->addend);
dest_insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!dest_insn)
break;
@ -2067,7 +2077,7 @@ static struct reloc *find_jump_table(struct objtool_file *file,
table_reloc = arch_find_switch_table(file, insn);
if (!table_reloc)
continue;
dest_insn = find_insn(file, table_reloc->sym->sec, table_reloc->addend);
dest_insn = find_insn(file, table_reloc->sym->sec, reloc_addend(table_reloc));
if (!dest_insn || !insn_func(dest_insn) || insn_func(dest_insn)->pfunc != func)
continue;
@ -2203,7 +2213,7 @@ static int read_unwind_hints(struct objtool_file *file)
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!insn) {
WARN("can't find insn for unwind_hints[%d]", i);
return -1;
@ -2271,7 +2281,8 @@ static int read_noendbr_hints(struct objtool_file *file)
return 0;
for_each_reloc(rsec, reloc) {
insn = find_insn(file, reloc->sym->sec, reloc->sym->offset + reloc->addend);
insn = find_insn(file, reloc->sym->sec,
reloc->sym->offset + reloc_addend(reloc));
if (!insn) {
WARN("bad .discard.noendbr entry");
return -1;
@ -2299,7 +2310,7 @@ static int read_retpoline_hints(struct objtool_file *file)
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!insn) {
WARN("bad .discard.retpoline_safe entry");
return -1;
@ -2335,7 +2346,7 @@ static int read_instr_hints(struct objtool_file *file)
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!insn) {
WARN("bad .discard.instr_end entry");
return -1;
@ -2354,7 +2365,7 @@ static int read_instr_hints(struct objtool_file *file)
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!insn) {
WARN("bad .discard.instr_begin entry");
return -1;
@ -2382,7 +2393,7 @@ static int read_validate_unret_hints(struct objtool_file *file)
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!insn) {
WARN("bad .discard.instr_end entry");
return -1;
@ -2413,7 +2424,7 @@ static int read_intra_function_calls(struct objtool_file *file)
return -1;
}
insn = find_insn(file, reloc->sym->sec, reloc->addend);
insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc));
if (!insn) {
WARN("bad .discard.intra_function_call entry");
return -1;
@ -3317,7 +3328,7 @@ static inline const char *call_dest_name(struct instruction *insn)
reloc = insn_reloc(NULL, insn);
if (reloc && !strcmp(reloc->sym->name, "pv_ops")) {
idx = (reloc->addend / sizeof(void *));
idx = (reloc_addend(reloc) / sizeof(void *));
snprintf(pvname, sizeof(pvname), "pv_ops[%d]", idx);
return pvname;
}
@ -3335,7 +3346,7 @@ static bool pv_call_dest(struct objtool_file *file, struct instruction *insn)
if (!reloc || strcmp(reloc->sym->name, "pv_ops"))
return false;
idx = (arch_dest_reloc_offset(reloc->addend) / sizeof(void *));
idx = (arch_dest_reloc_offset(reloc_addend(reloc)) / sizeof(void *));
if (file->pv_ops[idx].clean)
return true;
@ -4279,9 +4290,9 @@ static int validate_ibt_insn(struct objtool_file *file, struct instruction *insn
off = reloc->sym->offset;
if (reloc_type(reloc) == R_X86_64_PC32 ||
reloc_type(reloc) == R_X86_64_PLT32)
off += arch_dest_reloc_offset(reloc->addend);
off += arch_dest_reloc_offset(reloc_addend(reloc));
else
off += reloc->addend;
off += reloc_addend(reloc);
dest = find_insn(file, reloc->sym->sec, off);
if (!dest)
@ -4338,7 +4349,7 @@ static int validate_ibt_data_reloc(struct objtool_file *file,
struct instruction *dest;
dest = find_insn(file, reloc->sym->sec,
reloc->sym->offset + reloc->addend);
reloc->sym->offset + reloc_addend(reloc));
if (!dest)
return 0;

10
tools/objtool/elf.c
View File

@ -833,10 +833,10 @@ static struct reloc *elf_init_reloc(struct elf *elf, struct section *rsec,
reloc->sec = rsec;
reloc->sym = sym;
reloc->addend = addend;
reloc->rel.r_offset = offset;
reloc->rel.r_info = GELF_R_INFO(sym->idx, type);
reloc->rela.r_addend = addend;
if (elf_write_reloc(elf, reloc))
return NULL;
@ -911,8 +911,6 @@ static int read_reloc(struct section *rsec, int i, struct reloc *reloc)
return -1;
}
reloc->addend = rela ? reloc->rela.r_addend : 0;
return 0;
}
@ -1231,12 +1229,10 @@ int elf_write_reloc(struct elf *elf, struct reloc *reloc)
struct section *rsec = reloc->sec;
int ret;
if (rsec->sh.sh_type == SHT_RELA) {
reloc->rela.r_addend = reloc->addend;
if (rsec->sh.sh_type == SHT_RELA)
ret = gelf_update_rela(rsec->data, reloc_idx(reloc), &reloc->rela);
} else {
else
ret = gelf_update_rel(rsec->data, reloc_idx(reloc), &reloc->rel);
}
if (!ret) {
WARN_ELF("gelf_update_rela");

6
tools/objtool/include/objtool/elf.h
View File

@ -75,7 +75,6 @@ struct reloc {
struct section *sec;
struct symbol *sym;
struct list_head sym_reloc_entry;
s64 addend;
bool jump_table_start;
};
@ -217,6 +216,11 @@ static inline void set_reloc_type(struct reloc *reloc, int type)
reloc->rel.r_info = GELF_R_INFO(GELF_R_SYM(reloc->rel.r_info), type);
}
static inline s64 reloc_addend(struct reloc *reloc)
{
return reloc->rela.r_addend;
}
#define for_each_sec(file, sec) \
list_for_each_entry(sec, &file->elf->sections, list)

4
tools/objtool/special.c
View File

@ -62,7 +62,7 @@ static void reloc_to_sec_off(struct reloc *reloc, struct section **sec,
unsigned long *off)
{
*sec = reloc->sym->sec;
*off = reloc->sym->offset + reloc->addend;
*off = reloc->sym->offset + reloc_addend(reloc);
}
static int get_alt_entry(struct elf *elf, const struct special_entry *entry,
@ -126,7 +126,7 @@ static int get_alt_entry(struct elf *elf, const struct special_entry *entry,
sec, offset + entry->key);
return -1;
}
alt->key_addend = key_reloc->addend;
alt->key_addend = reloc_addend(key_reloc);
}
return 0;