diff options
Diffstat (limited to 'kernel/setjmp_tester')
| -rw-r--r-- | kernel/setjmp_tester/Makefile | 12 | ||||
| -rw-r--r-- | kernel/setjmp_tester/setjmp_tester.c | 147 |
2 files changed, 159 insertions, 0 deletions
diff --git a/kernel/setjmp_tester/Makefile b/kernel/setjmp_tester/Makefile new file mode 100644 index 000000000000..18492f35fd4a --- /dev/null +++ b/kernel/setjmp_tester/Makefile @@ -0,0 +1,12 @@ +# $NetBSD: Makefile,v 1.1 2025/04/27 16:22:26 riastradh Exp $ + +KMOD= setjmp_tester +KMODULEDIR= ${TESTSBASE}/kernel/${KMOD} + +SRCS= setjmp_tester.c + +ATFFILE= no +NOMAN= # defined + +.include <bsd.test.mk> +.include <bsd.kmodule.mk> diff --git a/kernel/setjmp_tester/setjmp_tester.c b/kernel/setjmp_tester/setjmp_tester.c new file mode 100644 index 000000000000..8b15b840effe --- /dev/null +++ b/kernel/setjmp_tester/setjmp_tester.c @@ -0,0 +1,147 @@ +/* $NetBSD: setjmp_tester.c,v 1.1 2025/04/27 16:22:26 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__KERNEL_RCSID(0, "$NetBSD: setjmp_tester.c,v 1.1 2025/04/27 16:22:26 riastradh Exp $"); + +#include <sys/module.h> +#include <sys/sysctl.h> +#include <sys/systm.h> + +MODULE(MODULE_CLASS_MISC, setjmp_tester, NULL); + +static struct sysctllog *setjmp_tester_sysctllog; +static const struct sysctlnode *setjmp_tester_sysctlnode; +static kmutex_t setjmp_tester_lock; +static bool setjmp_tester_done; +static label_t setjmp_tester_label; + +__noinline +static void +setjmp_tester_subroutine(void) +{ + + printf("%s: call longjmp\n", __func__); + setjmp_tester_done = true; + longjmp(&setjmp_tester_label); + printf("%s: unreachable\n", __func__); +} + +static int +setjmp_tester_test(void) +{ + int result; + + mutex_enter(&setjmp_tester_lock); + + setjmp_tester_done = false; + result = setjmp(&setjmp_tester_label); + if (!setjmp_tester_done) { + printf("%s: setjmp returned %d at first\n", __func__, result); + if (result != 0) { + result = -1; + goto out; + } + setjmp_tester_subroutine(); + /*NOTREACHED*/ + printf("%s: setjmp_tester_subroutine returned\n", __func__); + result = -1; + } else { + printf("%s: setjmp returned %d at second\n", __func__, result); + if (result == 0) { + result = -2; + goto out; + } + } + +out: mutex_exit(&setjmp_tester_lock); + return result; +} + +static int +setjmp_tester_test_sysctl(SYSCTLFN_ARGS) +{ + struct sysctlnode node = *rnode; + int v = 0; + int error; + + if (newp == NULL) { + error = ENOENT; + goto out; + } + error = sysctl_copyin(curlwp, newp, &v, sizeof(v)); + if (error) + goto out; + switch (v) { + case 1: + v = setjmp_tester_test(); + break; + default: + error = EINVAL; + break; + } + node.sysctl_data = &v; + error = sysctl_lookup(SYSCTLFN_CALL(&node)); + +out: return error; +} + +static int +setjmp_tester_modcmd(modcmd_t cmd, void *arg) +{ + int error = 0; + + switch (cmd) { + case MODULE_CMD_INIT: + mutex_init(&setjmp_tester_lock, MUTEX_DEFAULT, IPL_NONE); + error = sysctl_createv(&setjmp_tester_sysctllog, 0, + NULL, &setjmp_tester_sysctlnode, + CTLFLAG_PERMANENT, CTLTYPE_NODE, "setjmp_tester", + SYSCTL_DESCR("setjmp/longjmp testing interface"), + NULL, 0, NULL, 0, + CTL_KERN, CTL_CREATE, CTL_EOL); + if (error) + goto fini; + error = sysctl_createv(&setjmp_tester_sysctllog, 0, + &setjmp_tester_sysctlnode, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "test", + SYSCTL_DESCR("setjmp/longjmp test trigger"), + &setjmp_tester_test_sysctl, 0, NULL, 0, + CTL_CREATE, CTL_EOL); + if (error) + goto fini; + return error; + case MODULE_CMD_FINI: + fini: + sysctl_teardown(&setjmp_tester_sysctllog); + mutex_destroy(&setjmp_tester_lock); + return error; + default: + return ENOTTY; + } +} |