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[81.140.166.164]) by smtp.gmail.com with ESMTPSA id d16sm9285303wrg.27.2020.01.09.08.05.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jan 2020 08:05:03 -0800 (PST) From: Julien Thierry To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: jpoimboe@redhat.com, peterz@infradead.org, raphael.gault@arm.com, catalin.marinas@arm.com, will@kernel.org, Julien Thierry Subject: [RFC v5 15/57] objtool: Support addition to set frame pointer Date: Thu, 9 Jan 2020 16:02:18 +0000 Message-Id: <20200109160300.26150-16-jthierry@redhat.com> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200109160300.26150-1-jthierry@redhat.com> References: <20200109160300.26150-1-jthierry@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Support updating the frame pointer by adding an immediate value to the stack pointer in the CFA tracking code. Signed-off-by: Julien Thierry --- tools/objtool/check.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 19e96c4ad0a3..5b2539eaccba 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1394,6 +1394,18 @@ static int update_insn_state(struct instruction *insn, struct insn_state *state) break; } + if (op->src.reg == CFI_SP && cfa->base == CFI_SP && + op->dest.reg == CFI_BP && + regs[CFI_BP].base == CFI_CFA && + regs[CFI_BP].offset == -cfa->offset + op->src.offset) { + + /* lea disp(%rsp), %rbp */ + cfa->base = CFI_BP; + cfa->offset -= op->src.offset; + state->bp_scratch = false; + break; + } + if (op->src.reg == CFI_SP && cfa->base == CFI_SP) { /* drap: lea disp(%rsp), %drap */ -- 2.21.0