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Commit 09f30d83 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

objtool: Handle function aliases 



Function aliases result in different symbols for the same set of
instructions; track a canonical symbol so there is a unique point of
access.

This again prepares the way for function attributes. And in particular
the need for aliases comes from how KASAN uses them.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent a4d09dde

tools/objtool/elf.c

+11 −4
Original line number Diff line number Diff line
@@ -219,7 +219,7 @@ static int read_sections(struct elf *elf) 
static int read_symbols(struct elf *elf)

{

	struct section *symtab, *sec;

	struct symbol *sym, *pfunc;

	struct symbol *sym, *pfunc, *alias;

	struct list_head *entry, *tmp;

	int symbols_nr, i;

	char *coldstr;
@@ -239,6 +239,7 @@ static int read_symbols(struct elf *elf) 
			return -1;

		}

		memset(sym, 0, sizeof(*sym));

		alias = sym;



		sym->idx = i;
@@ -288,11 +289,17 @@ static int read_symbols(struct elf *elf) 
				break;

			}



			if (sym->offset == s->offset && sym->len >= s->len) {

			if (sym->offset == s->offset) {

				if (sym->len == s->len && alias == sym)

					alias = s;



				if (sym->len >= s->len) {

					entry = tmp;

					break;

				}

			}

		}

		sym->alias = alias;

		list_add(&sym->list, entry);

		hash_add(sym->sec->symbol_hash, &sym->hash, sym->idx);

	}

tools/objtool/elf.h

+1 −1
Original line number Diff line number Diff line
@@ -61,7 +61,7 @@ struct symbol { 
	unsigned char bind, type;

	unsigned long offset;

	unsigned int len;

	struct symbol *pfunc, *cfunc;

	struct symbol *pfunc, *cfunc, *alias;

};



struct rela {