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| author |   Alexandre Chartre <alexandre.chartre@oracle.com> | 2020-04-14 12:36:12 +0200 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2020-04-30 20:14:33 +0200 |
| commit | 8aa8eb2a8f5b3305a95f39957dd2b715fa668e21 (patch) | |
| tree | ed624343256478e97b84d39fac09bdc3228512e8 /tools/objtool/arch | |
| parent | objtool: Move the IRET hack into the arch decoder (diff) | |
| download | linux-dev-8aa8eb2a8f5b3305a95f39957dd2b715fa668e21.tar.xz linux-dev-8aa8eb2a8f5b3305a95f39957dd2b715fa668e21.zip | |
objtool: Add support for intra-function calls
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
Diffstat (limited to 'tools/objtool/arch')
| -rw-r--r-- | tools/objtool/arch/x86/decode.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c index d7b5d1096913..4b504fc90bbb 100644 --- a/tools/objtool/arch/x86/decode.c +++ b/tools/objtool/arch/x86/decode.c @@ -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: |