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[103.229.18.19]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a3e3cd3284sm14545575ad.91.2026.01.06.00.20.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jan 2026 00:20:38 -0800 (PST) From: Himanshu Chauhan To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, shuah@kernel.org Cc: Himanshu Chauhan Subject: [PATCH v2 2/2] riscv: Add breakpoint and watchpoint test for riscv Date: Tue, 6 Jan 2026 13:50:21 +0530 Message-ID: <20260106082021.2680658-3-himanshu.chauhan@oss.qualcomm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260106082021.2680658-1-himanshu.chauhan@oss.qualcomm.com> References: <20260106082021.2680658-1-himanshu.chauhan@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: tUN8cGRWcm8Vu7v7WnokLRDnSKryM4oM X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA2MDA3MCBTYWx0ZWRfX96vXhCmgEQYZ glmqrao+bI0cJjWvX24YNqWZ74ZGu1t9771zBolN48MaL/S5ySjmeqdPwk6+eY5xgv2OLKbmo49 8HUrq3x/O4+sMLxJ0FtMphWkFuTUj6lWbrj3bij1g2dT8oqFH9Ac3C1a1MEWO7Q7CmKgt1oBavL GnDQo27ok8lK65ul4NRgoM6ksZfCB2gD3ageeYLTBGkE47C8/CC++T7OtJMvz6xRgYdNTzVzrBN fcfQPXR1DZ/jxYA8zlA3ZAL4MFEAWak5bfLJCVB2el7qqiPL+xoZtsuSeYdxbzzKw20dZ2pR/Ib h3OTrclx3V3zxFaALlIXyy52DPA1GndNiX2QcgDuvXkOTJTosETxF8TKkgaNePdhfzmzJcJxtQU DdHkc6cjVy+5mL1YA1YrRflF+DjqNCfsdjGd8YPPm37lpn9ZUBwP7Gju0cgWDav2D95rcJp4Sxw IdQr6jc0CFw/Oen48OA== X-Proofpoint-GUID: tUN8cGRWcm8Vu7v7WnokLRDnSKryM4oM X-Authority-Analysis: v=2.4 cv=FK0WBuos c=1 sm=1 tr=0 ts=695cc5d8 cx=c_pps a=IZJwPbhc+fLeJZngyXXI0A==:117 a=Ou0eQOY4+eZoSc0qltEV5Q==:17 a=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=EUspDBNiAAAA:8 a=nrFWDfrXf5gqSM9dz-wA:9 a=uG9DUKGECoFWVXl0Dc02:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-05_02,2026-01-05_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 impostorscore=0 bulkscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 priorityscore=1501 clxscore=1011 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601060070 Content-Type: text/plain; charset="utf-8" Add self test for riscv architecture. It uses ptrace to ptrace framework to set/unset break/watchpoint and uses signals to check triggers. Signed-off-by: Himanshu Chauhan --- tools/testing/selftests/breakpoints/Makefile | 5 + .../breakpoints/breakpoint_test_riscv.c | 172 ++++++++++++++++++ 2 files changed, 177 insertions(+) create mode 100644 tools/testing/selftests/breakpoints/breakpoint_test_ris= cv.c diff --git a/tools/testing/selftests/breakpoints/Makefile b/tools/testing/s= elftests/breakpoints/Makefile index 9ec2c78de8ca..97ab746908d8 100644 --- a/tools/testing/selftests/breakpoints/Makefile +++ b/tools/testing/selftests/breakpoints/Makefile @@ -12,5 +12,10 @@ ifneq (,$(filter $(ARCH),aarch64 arm64)) TEST_GEN_PROGS +=3D breakpoint_test_arm64 endif =20 +ifneq (,$(filter $(ARCH),riscv)) +CFLAGS +=3D -static +TEST_GEN_PROGS +=3D breakpoint_test_riscv +endif + include ../lib.mk =20 diff --git a/tools/testing/selftests/breakpoints/breakpoint_test_riscv.c b/= tools/testing/selftests/breakpoints/breakpoint_test_riscv.c new file mode 100644 index 000000000000..61b9c53bb214 --- /dev/null +++ b/tools/testing/selftests/breakpoints/breakpoint_test_riscv.c @@ -0,0 +1,172 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2026 Qualcomm Technologies, Inc. + * + * Author: Himanshu Chauhan + */ + +#define _GNU_SOURCE +#include /* Definition of PERF_* constants */ +#include /* Definition of HW_* constants */ +#include /* Definition of SYS_* constants */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static int gfd; +sem_t ib_mtx, wp_mtx; +static int bp_triggered, wp_triggered; + +int setup_bp(bool is_x, void *addr, int sig) +{ + struct perf_event_attr pe; + int fd; + + memset(&pe, 0, sizeof(struct perf_event_attr)); + pe.type =3D PERF_TYPE_BREAKPOINT; + pe.size =3D sizeof(struct perf_event_attr); + + pe.config =3D 0; + pe.bp_type =3D is_x ? HW_BREAKPOINT_X : HW_BREAKPOINT_W; + pe.bp_addr =3D (unsigned long)addr; + pe.bp_len =3D sizeof(long); + + pe.sample_period =3D 1; + pe.sample_type =3D PERF_SAMPLE_IP; + pe.wakeup_events =3D 1; + + pe.disabled =3D 1; + pe.exclude_kernel =3D 1; + pe.exclude_hv =3D 1; + + fd =3D syscall(SYS_perf_event_open, &pe, 0, -1, -1, 0); + if (fd < 0) { + printf("Failed to open event: %llx\n", pe.config); + return -1; + } + + fcntl(fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC); + fcntl(fd, F_SETSIG, sig); + fcntl(fd, F_SETOWN, getpid()); + + ioctl(fd, PERF_EVENT_IOC_RESET, 0); + + return fd; +} + +static void sig_handler_bp(int signum, siginfo_t *oh, void *uc) +{ + int ret; + + bp_triggered++; + + printf("breakpoint triggered!\n"); + ioctl(gfd, PERF_EVENT_IOC_DISABLE, 0); + ret =3D sem_post(&ib_mtx); + if (ret) { + printf("Failed to report BP success\n"); + return; + } +} + +static void sig_handler_wp(int signum, siginfo_t *oh, void *uc) +{ + int ret; + + printf("watchpoint triggered!\n"); + ioctl(gfd, PERF_EVENT_IOC_DISABLE, 0); + wp_triggered++; + + ret =3D sem_post(&wp_mtx); + + if (ret) { + printf("Failed to report WP success\n"); + return; + } +} + +static void test_func(void) +{ +} + +static int trigger_bp(void) +{ + struct sigaction sa; + + memset(&sa, 0, sizeof(struct sigaction)); + sa.sa_sigaction =3D (void *)sig_handler_bp; + sa.sa_flags =3D SA_SIGINFO; + + if (sigaction(SIGIO, &sa, NULL) < 0) { + printf("failed to setup signal handler\n"); + return -1; + } + + gfd =3D setup_bp(1, test_func, SIGIO); + + if (gfd < 0) { + return -1; + } + + ioctl(gfd, PERF_EVENT_IOC_ENABLE, 0); + + test_func(); + + ioctl(gfd, PERF_EVENT_IOC_DISABLE, 0); + + close(gfd); +} + +static int trigger_wp(void) +{ + struct sigaction sa; + unsigned long test_data; + + memset(&sa, 0, sizeof(struct sigaction)); + sa.sa_sigaction =3D (void *)sig_handler_wp; + sa.sa_flags =3D SA_SIGINFO; + + if (sigaction(SIGUSR1, &sa, NULL) < 0) { + printf("failed to setup signal handler\n"); + return -1; + } + + gfd =3D setup_bp(0, &test_data, SIGUSR1); + + if (gfd < 0) { + printf("Failed to setup watchpoint\n"); + return -1; + } + ioctl(gfd, PERF_EVENT_IOC_ENABLE, 0); + test_data =3D 0xdeadbeef; + ioctl(gfd, PERF_EVENT_IOC_DISABLE, 0); +} + +int main(int argc, char *argv[]) +{ + struct sigaction sa; + + sem_init(&ib_mtx, 0, 0); + trigger_bp(); + sem_wait(&ib_mtx); + + if (bp_triggered) + printf("Breakpoint test passed!\n"); + + sem_init(&wp_mtx, 0, 0); + trigger_wp(); + sem_wait(&wp_mtx); + + if (wp_triggered) + printf("Watchpoint test passed!\n"); + + return 0; +} --=20 2.43.0