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[81.140.166.164]) by smtp.gmail.com with ESMTPSA id d16sm9285303wrg.27.2020.01.09.08.05.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jan 2020 08:05:05 -0800 (PST) From: Julien Thierry To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [RFC v5 16/57] objtool: Support restoring BP from the stack without POP Date: Thu, 9 Jan 2020 16:02:19 +0000 Message-Id: <20200109160300.26150-17-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 X-MC-Unique: EJ2EYDwGOu-LsDudC3h-zg-1 X-Mimecast-Spam-Score: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200109_080512_723059_486A6D9F X-CRM114-Status: UNSURE ( 9.93 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Julien Thierry , peterz@infradead.org, catalin.marinas@arm.com, raphael.gault@arm.com, jpoimboe@redhat.com, will@kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Support instruction that set BP to its previous value (base on the current CFA state) from the stack without modifying the stack pointer. Signed-off-by: Julien Thierry --- tools/objtool/check.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 5b2539eaccba..0a5c51e4e24c 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1507,6 +1507,12 @@ static int update_insn_state(struct instruction *insn, struct insn_state *state) cfa->base = state->drap_reg; cfa->offset = 0; state->drap_offset = -1; + } else if (!state->drap && op->src.reg == CFI_SP && + op->dest.reg == cfa->base) { + + /* mov disp(%rsp), %rbp */ + cfa->base = CFI_SP; + cfa->offset += op->src.offset; } if (state->drap && op->src.reg == CFI_BP && -- 2.21.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel