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objtool: Move the IRET hack into the arch decoder

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Quoting Julien:

  "And the other suggestion is my other email was that you don't even
  need to add INSN_EXCEPTION_RETURN. You can keep IRET as
  INSN_CONTEXT_SWITCH by default and x86 decoder lookups the symbol
  conaining an iret. If it's a function symbol, it can just set the type
  to INSN_OTHER so that it caries on to the next instruction after
  having handled the stack_op."

Suggested-by: Julien Thierry <jthierry@redhat.com>
Signed-off-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20200428191659.913283807@infradead.org
This commit is contained in:
Miroslav Benes 2020-04-24 16:30:42 +02:00 • committed by Peter Zijlstra
parent b09fb65e86
commit b490f45362
5 changed files with 21 additions and 25 deletions
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4
tools/objtool/elf.c
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@ -61,7 +61,7 @@ static void rb_add(struct rb_root *tree, struct rb_node *node,
rb_insert_color(node, tree);
}
static struct rb_node *rb_find_first(struct rb_root *tree, const void *key,
static struct rb_node *rb_find_first(const struct rb_root *tree, const void *key,
int (*cmp)(const void *key, const struct rb_node *))
{
struct rb_node *node = tree->rb_node;
@ -189,7 +189,7 @@ struct symbol *find_func_by_offset(struct section *sec, unsigned long offset)
return NULL;
}
struct symbol *find_symbol_containing(struct section *sec, unsigned long offset)
struct symbol *find_symbol_containing(const struct section *sec, unsigned long offset)
{
struct rb_node *node;