Messages in this thread Patch in this message | | | From | Julien Thierry <> | Subject | [RFC v5 36/57] objtool: arm64: Decode pointer auth load instructions | Date | Thu, 9 Jan 2020 16:02:39 +0000 |
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Decode load/store instruction provided by the v8.3 pointer authentication architecture extension.
Suggested-by: Raphael Gault <raphael.gault@arm.com> Signed-off-by: Julien Thierry <jthierry@redhat.com> --- tools/objtool/arch/arm64/decode.c | 51 +++++++++++++++++++ .../objtool/arch/arm64/include/insn_decode.h | 3 ++ 2 files changed, 54 insertions(+)
diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c index 1897f62987fa..0bbbacd74e48 100644 --- a/tools/objtool/arch/arm64/decode.c +++ b/tools/objtool/arch/arm64/decode.c @@ -885,6 +885,11 @@ static struct aarch64_insn_decoder ld_st_decoder[] = { .value = 0b001100010000010, .decode_func = arm_decode_ld_st_regs_off, }, + { + .mask = 0b001101010000001, + .value = 0b001100010000001, + .decode_func = arm_decode_ld_st_regs_pac, + }, { .mask = 0b001101000000000, .value = 0b001101000000000, @@ -1981,3 +1986,49 @@ int arm_decode_ld_st_regs_pair_pre(u32 instr, enum insn_type *type, return 0; } + +int arm_decode_ld_st_regs_pac(u32 instr, enum insn_type *type, + unsigned long *immediate, + struct list_head *ops_list) +{ + unsigned char size = 0, V = 0, W = 0, S = 0; + unsigned char rn = 0, rt = 0; + struct stack_op *op; + u32 imm9 = 0, s10 = 0; + + size = (instr >> 30) & ONES(2); + V = EXTRACT_BIT(instr, 26); + W = EXTRACT_BIT(instr, 11); + + if (size != 3 || V == 1) + return arm_decode_unknown(instr, type, immediate, ops_list); + + rn = (instr >> 5) & ONES(5); + + if (!stack_related_reg(rn)) { + *type = INSN_OTHER; + return 0; + } + + S = EXTRACT_BIT(instr, 22); + s10 = (S << 9) | imm9; + + *type = INSN_STACK; + + op = calloc(1, sizeof(*op)); + list_add_tail(&op->list, ops_list); + + op->dest.reg = rt; + op->dest.type = OP_DEST_REG; + op->dest.offset = 0; + op->src.offset = (SIGN_EXTEND(s10, 9) << 3); + if (W) { /* pre-indexed/writeback */ + op->src.type = OP_SRC_POP; + op->src.reg = rn; + } else { + op->src.type = OP_SRC_REG_INDIRECT; + op->src.reg = rn; + } + + return 0; +} diff --git a/tools/objtool/arch/arm64/include/insn_decode.h b/tools/objtool/arch/arm64/include/insn_decode.h index 89488c5df5e9..d819d2e795a3 100644 --- a/tools/objtool/arch/arm64/include/insn_decode.h +++ b/tools/objtool/arch/arm64/include/insn_decode.h @@ -135,6 +135,9 @@ int arm_decode_atomic(u32 instr, enum insn_type *type, int arm_decode_ld_st_regs_off(u32 instr, enum insn_type *type, unsigned long *immediate, struct list_head *ops_list); +int arm_decode_ld_st_regs_pac(u32 instr, enum insn_type *type, + unsigned long *immediate, + struct list_head *ops_list); int arm_decode_ld_st_regs_unsigned(u32 instr, enum insn_type *type, unsigned long *immediate, struct list_head *ops_list); -- 2.21.0
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