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Date: Thu, 9 Jan 2020 16:02:41 +0000 From: Julien Thierry <jthierry@...hat.com> To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Cc: jpoimboe@...hat.com, peterz@...radead.org, raphael.gault@....com, catalin.marinas@....com, will@...nel.org, Julien Thierry <jthierry@...hat.com> Subject: [RFC v5 38/57] objtool: arm64: Decode load/store with memory tag Decode load/store instructions provided by the v8.5 memorty tagging architecture extension. Suggested-by: Raphael Gault <raphael.gault@....com> Signed-off-by: Julien Thierry <jthierry@...hat.com> --- tools/objtool/arch/arm64/decode.c | 87 +++++++++++++++++++ .../objtool/arch/arm64/include/insn_decode.h | 3 + 2 files changed, 90 insertions(+) diff --git a/tools/objtool/arch/arm64/decode.c b/tools/objtool/arch/arm64/decode.c index becc563345dd..bc4c62401012 100644 --- a/tools/objtool/arch/arm64/decode.c +++ b/tools/objtool/arch/arm64/decode.c @@ -830,6 +830,11 @@ static struct aarch64_insn_decoder ld_st_decoder[] = { .value = 0b000011100000000, .decode_func = arm_decode_adv_simd_single_post, }, + { + .mask = 0b111111010000000, + .value = 0b110101010000000, + .decode_func = arm_decode_ld_st_mem_tags, + }, { .mask = 0b001111000000000, .value = 0b000000000000000, @@ -2100,3 +2105,85 @@ int arm_decode_ldapr_stlr_unsc_imm(u32 instr, enum insn_type *type, return 0; } + +int arm_decode_ld_st_mem_tags(u32 instr, enum insn_type *type, + unsigned long *immediate, + struct list_head *ops_list) +{ + u32 imm9 = 0; + unsigned char opc = 0, op2 = 0, rn = 0, rt = 0, decode_field = 0; + struct stack_op *op; + + imm9 = (instr >> 12) & ONES(9); + opc = (instr >> 22) & ONES(2); + op2 = (instr >> 10) & ONES(2); + rn = (instr >> 5) & ONES(5); + rt = instr & ONES(6); + + decode_field = (opc << 2) | op2; + + if (decode_field == 0x0 || + (decode_field == 0x8 && imm9 != 0) || + (decode_field == 0xC && imm9 != 0)) { + return arm_decode_unknown(instr, type, immediate, ops_list); + } + + if (!stack_related_reg(rn)) { + *type = INSN_OTHER; + return 0; + } + *type = INSN_STACK; + *immediate = imm9; + + op = calloc(1, sizeof(*op)); + list_add_tail(&op->list, ops_list); + + /* + * Offset should normally be shifted to the + * left of LOG2_TAG_GRANULE + */ + switch (decode_field) { + case 1: + case 5: + case 9: + case 13: + /* post index */ + case 3: + case 7: + case 8: + case 11: + case 15: + /* pre index */ + op->dest.reg = rn; + op->dest.type = OP_DEST_PUSH; + op->dest.offset = SIGN_EXTEND(imm9, 9); + op->src.reg = rt; + op->src.type = OP_SRC_REG; + op->src.offset = 0; + return 0; + case 2: + case 6: + case 10: + case 14: + /* store */ + op->dest.reg = rn; + op->dest.type = OP_DEST_REG_INDIRECT; + op->dest.offset = SIGN_EXTEND(imm9, 9); + op->src.reg = rt; + op->src.type = OP_SRC_REG; + op->src.offset = 0; + return 0; + case 4: + case 12: + /* load */ + op->src.reg = rn; + op->src.type = OP_SRC_REG_INDIRECT; + op->src.offset = SIGN_EXTEND(imm9, 9); + op->dest.reg = rt; + op->dest.type = OP_DEST_REG; + op->dest.offset = 0; + return 0; + } + + return -1; +} diff --git a/tools/objtool/arch/arm64/include/insn_decode.h b/tools/objtool/arch/arm64/include/insn_decode.h index 1721d9c487d0..e6a62691b487 100644 --- a/tools/objtool/arch/arm64/include/insn_decode.h +++ b/tools/objtool/arch/arm64/include/insn_decode.h @@ -106,6 +106,9 @@ int arm_decode_adv_simd_single(u32 instr, enum insn_type *type, int arm_decode_adv_simd_single_post(u32 instr, enum insn_type *type, unsigned long *immediate, struct list_head *ops_list); +int arm_decode_ld_st_mem_tags(u32 instr, enum insn_type *type, + unsigned long *immediate, + struct list_head *ops_list); int arm_decode_ldapr_stlr_unsc_imm(u32 instr, enum insn_type *type, unsigned long *immediate, struct list_head *ops_list); -- 2.21.0
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