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([172.58.111.133]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-741a71dc78asm380409a34.30.2025.08.02.16.38.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Aug 2025 16:38:06 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, Pierrick Bouvier Subject: [PATCH v2 64/85] target/arm: Implement GCSSS1 Date: Sun, 3 Aug 2025 09:29:32 +1000 Message-ID: <20250802232953.413294-65-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250802232953.413294-1-richard.henderson@linaro.org> References: <20250802232953.413294-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::32f; envelope-from=richard.henderson@linaro.org; helo=mail-ot1-x32f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Reviewed-by: Pierrick Bouvier Signed-off-by: Richard Henderson --- target/arm/cpregs.h | 1 + target/arm/cpregs-gcs.c | 3 +++ target/arm/tcg/translate-a64.c | 32 ++++++++++++++++++++++++++++++++ 3 files changed, 36 insertions(+) diff --git a/target/arm/cpregs.h b/target/arm/cpregs.h index 392a0a264f..ee8b870e17 100644 --- a/target/arm/cpregs.h +++ b/target/arm/cpregs.h @@ -52,6 +52,7 @@ enum { ARM_CP_GCSPUSHX = 0x000a, ARM_CP_GCSPOPX = 0x000b, ARM_CP_GCSPOPCX = 0x000c, + ARM_CP_GCSSS1 = 0x000d, /* Flag: reads produce resetvalue; writes ignored. */ ARM_CP_CONST = 1 << 4, diff --git a/target/arm/cpregs-gcs.c b/target/arm/cpregs-gcs.c index ab53a4314f..bdafc60786 100644 --- a/target/arm/cpregs-gcs.c +++ b/target/arm/cpregs-gcs.c @@ -114,6 +114,9 @@ static const ARMCPRegInfo gcs_reginfo[] = { { .name = "GCSPOPM", .state = ARM_CP_STATE_AA64, .opc0 = 1, .opc1 = 3, .crn = 7, .crm = 7, .opc2 = 1, .access = PL0_R, .type = ARM_CP_GCSPOPM }, + { .name = "GCSSS1", .state = ARM_CP_STATE_AA64, + .opc0 = 1, .opc1 = 3, .crn = 7, .crm = 7, .opc2 = 2, + .access = PL0_W, .type = ARM_CP_GCSSS1 }, { .name = "GCSPUSHX", .state = ARM_CP_STATE_AA64, .opc0 = 1, .opc1 = 0, .crn = 7, .crm = 7, .opc2 = 4, .access = PL1_W, .accessfn = access_gcspushx, .fgt = FGT_NGCSEPP, diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c index af91b7f95f..e4c7801740 100644 --- a/target/arm/tcg/translate-a64.c +++ b/target/arm/tcg/translate-a64.c @@ -2634,6 +2634,33 @@ static void gen_gcspopx(DisasContext *s) tcg_gen_st_i64(addr, tcg_env, sp_off); } +static void gen_gcsss1(DisasContext *s, int rt) +{ + int sp_off = offsetof(CPUARMState, cp15.gcspr_el[s->current_el]); + int mmuidx = core_gcs_mem_index(s->mmu_idx); + MemOp mop = finalize_memop(s, MO_64 | MO_ALIGN); + TCGv_i64 inptr = cpu_reg(s, rt); + TCGv_i64 cmp = tcg_temp_new_i64(); + TCGv_i64 new = tcg_temp_new_i64(); + TCGv_i64 old = tcg_temp_new_i64(); + TCGLabel *fail_label = + delay_exception(s, EXCP_UDEF, syn_gcs_data_check(GCS_IT_GCSSS1, rt)); + + /* Compute the valid cap entry that the new stack must have. */ + tcg_gen_ld_i64(new, tcg_env, sp_off); + tcg_gen_deposit_i64(cmp, inptr, tcg_constant_i64(1), 0, 12); + /* Compute the in-progress cap entry for the old stack. */ + tcg_gen_deposit_i64(new, new, tcg_constant_i64(5), 0, 3); + + /* Swap the valid cap the with the in-progress cap. */ + tcg_gen_atomic_cmpxchg_i64(old, inptr, cmp, new, mmuidx, mop); + tcg_gen_brcond_i64(TCG_COND_NE, old, cmp, fail_label); + + /* The new stack had a valid cap: change gcspr. */ + tcg_gen_andi_i64(new, inptr, ~7); + tcg_gen_st_i64(new, tcg_env, sp_off); +} + /* MRS - move from system register * MSR (register) - move to system register * SYS @@ -2945,6 +2972,11 @@ static void handle_sys(DisasContext *s, bool isread, gen_gcspopx(s); } return; + case ARM_CP_GCSSS1: + if (s->gcs_en) { + gen_gcsss1(s, rt); + } + return; default: g_assert_not_reached(); } -- 2.43.0