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Wed, 29 Oct 2025 08:51:01 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: Julian Ganz , Daniel Henrique Barboza , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Palmer Dabbelt , Alistair Francis , Weiwei Li , Liu Zhiwei , qemu-riscv@nongnu.org (open list:RISC-V TCG CPUs) Subject: [PULL 31/35] tests: add test with interrupted memory accesses on rv64 Date: Wed, 29 Oct 2025 15:50:40 +0000 Message-ID: <20251029155045.257802-32-alex.bennee@linaro.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251029155045.257802-1-alex.bennee@linaro.org> References: <20251029155045.257802-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::530; envelope-from=alex.bennee@linaro.org; helo=mail-ed1-x530.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=unavailable 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1761753187245158500 From: Julian Ganz This test aims at catching API misbehaviour w.r.t. the interaction between interrupts and memory accesses, such as the bug fixed in 27f347e6a1d269c533633c812321cabb249eada8 (accel/tcg: also suppress asynchronous IRQs for cpu_io_recompile) Because the condition for triggering misbehaviour may not be deterministic and the cross-section between memory accesses and interrupt handlers may be small, we have to place our trust in large numbers. Instead of guessing/trying an arbitrary, fixed loop-bound, we decided to loop for a fixed amount of real-time. This avoids the test running into a time-out on slower machines while enabling a high number of possible interactions on faster machines. The test program sends a single '.' per 1000000 loads/stores over the serial. This output is not captured, but may be used by developers to gauge the number of possible interactions. Reviewed-by: Daniel Henrique Barboza Signed-off-by: Julian Ganz Message-ID: <20251027110344.2289945-32-alex.bennee@linaro.org> Signed-off-by: Alex Benn=C3=A9e diff --git a/tests/tcg/riscv64/Makefile.softmmu-target b/tests/tcg/riscv64/= Makefile.softmmu-target index d9c0036eb4b..eb1ce6504a0 100644 --- a/tests/tcg/riscv64/Makefile.softmmu-target +++ b/tests/tcg/riscv64/Makefile.softmmu-target @@ -30,5 +30,11 @@ run-plugin-doubletrap: doubletrap $(QEMU) -plugin ../plugins/libdiscons.so -d plugin -D $<.pout \ $(QEMU_OPTS)$<) =20 +EXTRA_RUNS +=3D run-plugin-interruptedmemory +run-plugin-interruptedmemory: interruptedmemory + $(call run-test, $<, \ + $(QEMU) -plugin ../plugins/libdiscons.so -d plugin -D $<.pout \ + $(QEMU_OPTS)$<) + # We don't currently support the multiarch system tests undefine MULTIARCH_TESTS diff --git a/tests/tcg/riscv64/interruptedmemory.S b/tests/tcg/riscv64/inte= rruptedmemory.S new file mode 100644 index 00000000000..cd9073ee314 --- /dev/null +++ b/tests/tcg/riscv64/interruptedmemory.S @@ -0,0 +1,97 @@ + .option norvc + + .text + .global _start +_start: + # Set up trap vector + lla t0, trap + csrw mtvec, t0 + + # Set up timer + lui t1, 0x02004 + sd zero, 0(t1) # MTIMECMP0 + + # Enable timer interrupts + li t0, 0x80 + csrrs zero, mie, t0 + csrrsi zero, mstatus, 0x8 + + # Set up UART + lui t1, 0x10000 + li a0, 0x80 # DLAB=3D1 + sb a0, 3(t1) + li a0, 1 # Full speed + sw a0, 0(t1) + li a0, 0x03 # 8N1, DLAB=3D0 + sb a0, 3(t1) + + # Run test for around 60s + call rtc_get + li t0, 30 + slli t0, t0, 30 # Approx. 10e9 ns + add t0, t0, a0 +0: + # Tight loop with memory accesses + li a1, 1000000 + la a2, semiargs +1: + ld a0, 0(a2) + sd a0, 0(a2) + addi a1, a1, -1 + bnez a1, 1b + + li a0, '.' + call send_byte + call rtc_get + bltu a0, t0, 0b + + li a0, '\n' + call send_byte + + # Exit + li a0, 0 + 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 . + +rtc_get: + # Get current time from the goldfish RTC + lui t3, 0x0101 + lw a0, 0(t3) + lw t3, 4(t3) + slli t3, t3, 32 + add a0, a0, t3 + ret + +send_byte: + # Send a single byte over the serial + lui t3, 0x10000 + lb a1, 5(t3) + andi a1, a1, 0x20 + beqz a1, send_byte + sb a0, 0(t3) + ret + + .balign 4 +trap: + lui t5, 0x0200c + ld t6, -0x8(t5) # MTIME + addi t6, t6, 100 + lui t5, 0x02004 + sd t6, 0(t5) # MTIMECMP + mret + + .data + .balign 16 +semiargs: + .space 16 --=20 2.47.3