objtool: Support addition to set CFA base
On arm64, the compiler can set the frame pointer either with a move operation or with and add operation like: add (SP + constant), BP For a simple move operation, the CFA base is changed from SP to BP. Handle also changing the CFA base when the frame pointer is set with an addition instruction. Signed-off-by: Julien Thierry <jthierry@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
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@ -1960,6 +1960,17 @@ static int update_cfi_state(struct instruction *insn, struct cfi_state *cfi,
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break;
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}
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if (!cfi->drap && op->src.reg == CFI_SP &&
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op->dest.reg == CFI_BP && cfa->base == CFI_SP &&
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check_reg_frame_pos(®s[CFI_BP], -cfa->offset + op->src.offset)) {
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/* lea disp(%rsp), %rbp */
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cfa->base = CFI_BP;
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cfa->offset -= op->src.offset;
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cfi->bp_scratch = false;
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break;
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}
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if (op->src.reg == CFI_SP && cfa->base == CFI_SP) {
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/* drap: lea disp(%rsp), %drap */
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