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objtool: Add support for intra-function calls

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Change objtool to support intra-function calls. On x86, an intra-function
call is represented in objtool as a push onto the stack (of the return
address), and a jump to the destination address. That way the stack
information is correctly updated and the call flow is still accurate.

Signed-off-by: Alexandre Chartre <alexandre.chartre@oracle.com>
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/20200414103618.12657-4-alexandre.chartre@oracle.com
This commit is contained in:
Alexandre Chartre
2020-04-14 12:36:12 +02:00
committed by Peter Zijlstra
parent b490f45362
commit 8aa8eb2a8f
4 changed files with 102 additions and 4 deletions
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8
tools/objtool/arch/x86/decode.c
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@@ -496,6 +496,14 @@ int arch_decode_instruction(const struct elf *elf, const struct section *sec,
case 0xe8:
*type = INSN_CALL;
/*
* For the impact on the stack, a CALL behaves like
* a PUSH of an immediate value (the return address).
*/
ADD_OP(op) {
op->src.type = OP_SRC_CONST;
op->dest.type = OP_DEST_PUSH;
}
break;
case 0xfc: