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objtool: Rework the elf_rebuild_reloc_section() logic

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commit 3a647607b5 upstream.

Instead of manually calling elf_rebuild_reloc_section() on sections
we've called elf_add_reloc() on, have elf_write() DTRT.

This makes it easier to add random relocations in places without
carefully tracking when we're done and need to flush what section.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/20210326151259.754213408@infradead.org
[bwh: Backported to 5.10: drop changes in create_mcount_loc_sections()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra 2021-03-26 16:12:06 +01:00 committed by Greg Kroah-Hartman
parent d42fa5bf19
commit c9049cf480
4 changed files with 14 additions and 13 deletions
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3
tools/objtool/check.c
View file

@ -542,9 +542,6 @@ static int create_static_call_sections(struct objtool_file *file)
idx++;
}
if (elf_rebuild_reloc_section(file->elf, reloc_sec))
return -1;
return 0;
}

20
tools/objtool/elf.c
View file

@ -530,6 +530,8 @@ void elf_add_reloc(struct elf *elf, struct reloc *reloc)
list_add_tail(&reloc->list, &sec->reloc_list);
elf_hash_add(elf->reloc_hash, &reloc->hash, reloc_hash(reloc));
sec->changed = true;
}
static int read_rel_reloc(struct section *sec, int i, struct reloc *reloc, unsigned int *symndx)
@ -609,7 +611,9 @@ static int read_relocs(struct elf *elf)
return -1;
}
elf_add_reloc(elf, reloc);
list_add_tail(&reloc->list, &sec->reloc_list);
elf_hash_add(elf->reloc_hash, &reloc->hash, reloc_hash(reloc));
nr_reloc++;
}
max_reloc = max(max_reloc, nr_reloc);
@ -920,14 +924,11 @@ static int elf_rebuild_rela_reloc_section(struct section *sec, int nr)
return 0;
}
int elf_rebuild_reloc_section(struct elf *elf, struct section *sec)
static int elf_rebuild_reloc_section(struct elf *elf, struct section *sec)
{
struct reloc *reloc;
int nr;
sec->changed = true;
elf->changed = true;
nr = 0;
list_for_each_entry(reloc, &sec->reloc_list, list)
nr++;
@ -991,9 +992,15 @@ int elf_write(struct elf *elf)
struct section *sec;
Elf_Scn *s;
/* Update section headers for changed sections: */
/* Update changed relocation sections and section headers: */
list_for_each_entry(sec, &elf->sections, list) {
if (sec->changed) {
if (sec->base &&
elf_rebuild_reloc_section(elf, sec)) {
WARN("elf_rebuild_reloc_section");
return -1;
}
s = elf_getscn(elf->elf, sec->idx);
if (!s) {
WARN_ELF("elf_getscn");
@ -1005,6 +1012,7 @@ int elf_write(struct elf *elf)
}
sec->changed = false;
elf->changed = true;
}
}

1
tools/objtool/elf.h
View file

@ -142,7 +142,6 @@ struct reloc *find_reloc_by_dest_range(const struct elf *elf, struct section *se
struct symbol *find_func_containing(struct section *sec, unsigned long offset);
void insn_to_reloc_sym_addend(struct section *sec, unsigned long offset,
struct reloc *reloc);
int elf_rebuild_reloc_section(struct elf *elf, struct section *sec);
#define for_each_sec(file, sec) \
list_for_each_entry(sec, &file->elf->sections, list)

3
tools/objtool/orc_gen.c
View file

@ -251,8 +251,5 @@ int orc_create(struct objtool_file *file)
return -1;
}
if (elf_rebuild_reloc_section(file->elf, ip_rsec))
return -1;
return 0;
}