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Mon, 17 Aug 2026 08:07:23 -0700 (PDT) Received: from X1 ([178.66.48.90]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc13bf05584sm900775a12.4.2026.08.17.08.07.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Aug 2026 08:07:22 -0700 (PDT) From: Vladimir Isaev To: qemu-devel@nongnu.org Cc: palmer@dabbelt.com, alistair.francis@wdc.com, liwei1518@gmail.com, daniel.barboza@oss.qualcomm.com, zhiwei_liu@linux.alibaba.com, chao.liu@processmission.com, qemu-riscv@nongnu.org, joel@jms.id.au, npiggin@gmail.com, Vladimir Isaev Subject: [PATCH v2 2/2] tests/tcg/riscv64: add misa write test Date: Mon, 17 Aug 2026 18:06:38 +0300 Message-ID: <20260817150653.40357-3-vvisaev@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817150653.40357-1-vvisaev@gmail.com> References: <20260817150653.40357-1-vvisaev@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::42e; envelope-from=vvisaev@gmail.com; helo=mail-pf1-x42e.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, FREEMAIL_FROM=0.001, 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-riscv@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-riscv-bounces+qemu-riscv=archiver.kernel.org@nongnu.org Sender: qemu-riscv-bounces+qemu-riscv=archiver.kernel.org@nongnu.org Link: https://lore.kernel.org/r/20260321144554.606417-2-npiggin@gmail.com Suggested-by: Nicholas Piggin Signed-off-by: Vladimir Isaev --- tests/tcg/riscv64/Makefile.softmmu-target | 4 ++ tests/tcg/riscv64/test-misa-w.S | 88 +++++++++++++++++++++++ 2 files changed, 92 insertions(+) create mode 100644 tests/tcg/riscv64/test-misa-w.S diff --git a/tests/tcg/riscv64/Makefile.softmmu-target b/tests/tcg/riscv64/Makefile.softmmu-target index 82be8a2c91..2c7f00976c 100644 --- a/tests/tcg/riscv64/Makefile.softmmu-target +++ b/tests/tcg/riscv64/Makefile.softmmu-target @@ -41,5 +41,9 @@ comma:= , run-test-crc32: test-crc32 $(call run-test, $<, $(QEMU) -cpu rv64$(comma)xlrbr=true $(QEMU_OPTS)$<) +EXTRA_RUNS += run-test-misa-w +run-test-misa-w: test-misa-w + $(call run-test, $<, $(QEMU) -cpu rv64$(comma)x-misa-w=true$(comma)c=true$(comma)v=true $(QEMU_OPTS)$<) + # We don't currently support the multiarch system tests undefine MULTIARCH_TESTS diff --git a/tests/tcg/riscv64/test-misa-w.S b/tests/tcg/riscv64/test-misa-w.S new file mode 100644 index 0000000000..7f1eb30023 --- /dev/null +++ b/tests/tcg/riscv64/test-misa-w.S @@ -0,0 +1,88 @@ +/* + * Test for MISA changing C and related IALIGN alignment cases + * + * This test verifies that the "C" extension can be cleared and set in MISA, + * that a branch to 2-byte aligned instructions can be executed when "C" is + * enabled, and that a write to MISA which would increase IALIGN and cause + * the next instruction to be unaligned is ignored. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#define RVC (1 << ('C'-'A')) +#define RVV (1 << ('V'-'A')) + +.option norvc + .text + .global _start +_start: + lla t0, trap + csrw mtvec, t0 + + csrr t0, misa + li t1, RVC + not t1, t1 + and t0, t0, t1 + csrw misa, t0 + csrr t1, misa + li a0, 2 # fail code + bne t0, t1, _exit # Could not clear RVC in MISA + + li t1, RVC + or t0, t0, t1 + csrw misa, t0 + csrr t1, misa + li a0, 3 # fail code + bne t0, t1, _exit # Could not set RVC in MISA + + j unalign +. = . + 2 +unalign: + + li t1, RVC + not t1, t1 + and t0, t0, t1 + csrw misa, t0 + csrr t1, misa + li a0, 4 # fail code + beq t0, t1, _exit # Was able to clear RVC in MISA + + li t0, (RVC|RVV) + not t0, t0 + and t0, t0, t1 + csrw misa, t0 + csrr t0, misa + li a0, 5 # fail code + bne t0, t1, _exit # MISA write was not ignored (RVV was cleared) + + j realign +. = . + 2 +realign: + + # Success! + li a0, 0 + j _exit + +trap: + # Any trap is a fail code 1 + li a0, 1 + +# Exit code in a0 +_exit: + lla a1, semiargs + li t0, 0x20026 # ADP_Stopped_ApplicationExit + sd t0, 0(a1) + sd a0, 8(a1) + li a0, 0x20 # TARGET_SYS_EXIT_EXTENDED + + # Semihosting call sequence + .balign 16 + slli zero, zero, 0x1f + ebreak + srai zero, zero, 0x7 + j . + + .data + .balign 16 +semiargs: + .space 16 -- 2.55.0