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[81.140.166.164]) by smtp.gmail.com with ESMTPSA id h2sm8591413wrv.66.2020.01.09.08.07.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Jan 2020 08:07:36 -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 35/57] objtool: arm64: Decode atomic load/store Date: Thu, 9 Jan 2020 16:02:38 +0000 Message-Id: <20200109160300.26150-36-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 Decode v8.1 atomic load/store instructions. Suggested-by: Raphael Gault Signed-off-by: Julien Thierry --- tools/objtool/arch/arm64/decode.c | 86 +++++++++++++++++++ .../objtool/arch/arm64/include/insn_decode.h | 2 + 2 files changed, 88 insertions(+) diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c index e3f77d68b282..1897f62987fa 100644 --- a/tools/objtool/arch/arm64/decode.c +++ b/tools/objtool/arch/arm64/decode.c @@ -875,6 +875,11 @@ static struct aarch64_insn_decoder ld_st_decoder[] = { .value = 0b001100000000011, .decode_func = arm_decode_ld_st_imm_pre, }, + { + .mask = 0b001101010000011, + .value = 0b001100010000000, + .decode_func = arm_decode_atomic, + }, { .mask = 0b001101010000011, .value = 0b001100010000010, @@ -1667,6 +1672,87 @@ int arm_decode_ld_st_imm_unpriv(u32 instr, enum insn_type *type, return 0; } +static struct aarch64_insn_decoder atom_unallocs_decoder[] = { + { + .mask = 0b1001111, + .value = 0b0001001, + }, + { + .mask = 0b1001110, + .value = 0b0001010, + }, + { + .mask = 0b1001111, + .value = 0b0001101, + }, + { + .mask = 0b1001110, + .value = 0b0001110, + }, + { + .mask = 0b1101111, + .value = 0b0001100, + }, + { + .mask = 0b1111111, + .value = 0b0111100, + }, + { + .mask = 0b1000000, + .value = 0b1000000, + }, +}; + +int arm_decode_atomic(u32 instr, enum insn_type *type, + unsigned long *immediate, + struct list_head *ops_list) +{ + unsigned char V = 0, A = 0, R = 0, o3 = 0, opc = 0; + unsigned char rn = 0, rt = 0; + unsigned char decode_field = 0; + struct stack_op *op; + int i = 0; + + V = EXTRACT_BIT(instr, 26); + A = EXTRACT_BIT(instr, 23); + R = EXTRACT_BIT(instr, 22); + o3 = EXTRACT_BIT(instr, 15); + opc = (instr >> 12) & ONES(3); + + decode_field = (V << 6) | (A << 5) | (R << 4) | (o3 << 3) | opc; + + for (i = 0; i < ARRAY_SIZE(atom_unallocs_decoder); i++) { + if ((decode_field & atom_unallocs_decoder[i].mask) == + atom_unallocs_decoder[i].value) { + return arm_decode_unknown(instr, + type, + immediate, + ops_list); + } + } + + rn = (instr >> 5) & ONES(5); + rt = instr & ONES(5); + + if (!stack_related_reg(rn)) { + *type = INSN_OTHER; + return 0; + } + *type = INSN_STACK; + + op = calloc(1, sizeof(*op)); + list_add_tail(&op->list, ops_list); + + op->src.reg = rn; + op->src.type = OP_DEST_REG_INDIRECT; + op->src.offset = 0; + op->dest.type = OP_DEST_REG; + op->dest.reg = rt; + op->dest.offset = 0; + + return 0; +} + int arm_decode_ld_st_regs_off(u32 instr, enum insn_type *type, unsigned long *immediate, struct list_head *ops_list) diff --git a/tools/objtool/arch/arm64/include/insn_decode.h b/tools/objtool/arch/arm64/include/insn_decode.h index 61152b4aa42a..89488c5df5e9 100644 --- a/tools/objtool/arch/arm64/include/insn_decode.h +++ b/tools/objtool/arch/arm64/include/insn_decode.h @@ -130,6 +130,8 @@ int arm_decode_ld_st_imm_unpriv(u32 instr, enum insn_type *type, int arm_decode_ld_st_imm_pre(u32 instr, enum insn_type *type, unsigned long *immediate, struct list_head *ops_list); +int arm_decode_atomic(u32 instr, enum insn_type *type, + unsigned long *immediate, struct list_head *ops_list); int arm_decode_ld_st_regs_off(u32 instr, enum insn_type *type, unsigned long *immediate, struct list_head *ops_list); -- 2.21.0