Date: Mon, 04 May 2026 07:17:09 +0000 From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 2157c0e19672 - stable/15 - tests/sys/arch/amd64: add a program to check INT $0x80 behavior on amd64 Message-ID: <69f847f5.4065f.4f827677@gitrepo.freebsd.org>
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The branch stable/15 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=2157c0e19672e341130e0444ac6d902966da0a26 commit 2157c0e19672e341130e0444ac6d902966da0a26 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2026-04-27 04:23:36 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2026-05-04 07:16:40 +0000 tests/sys/arch/amd64: add a program to check INT $0x80 behavior on amd64 (cherry picked from commit 2c2ec6bbc9cc7762a250ffe903bda6c2e44d25ff) --- tests/sys/arch/amd64/Makefile | 7 ++++ tests/sys/arch/amd64/int0x80.c | 94 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 101 insertions(+) diff --git a/tests/sys/arch/amd64/Makefile b/tests/sys/arch/amd64/Makefile new file mode 100644 index 000000000000..34f3c90c4082 --- /dev/null +++ b/tests/sys/arch/amd64/Makefile @@ -0,0 +1,7 @@ +TESTSDIR= ${TESTSBASE}/sys/arch/amd64 + +PLAIN_TESTS_C+= int0x80 + +BINDIR= ${TESTSDIR} + +.include <bsd.test.mk> diff --git a/tests/sys/arch/amd64/int0x80.c b/tests/sys/arch/amd64/int0x80.c new file mode 100644 index 000000000000..e03462a6dccd --- /dev/null +++ b/tests/sys/arch/amd64/int0x80.c @@ -0,0 +1,94 @@ +/* + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright 2026 The FreeBSD Foundation + * + * This software were developed by + * Konstantin Belousov <kib@FreeBSD.org> under sponsorship from + * the FreeBSD Foundation. + */ + +#include <sys/syscall.h> +#include <err.h> +#include <signal.h> +#include <stdatomic.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#ifndef __amd64__ +#error "amd64 only" +#endif + +/* + * The check to see how "INT $0x80" behaves for amd64 native ABI + * processes. Before bd8edba0792b71be3f8ed5dea9c22287e95c986a it + * executed syscalls with amd64 calling conventions. After that + * revision, it should raise SIGBUS. + */ + +static uintptr_t int0x80_loc; +static int signo; +extern char after_int0x80[]; + +static void +sigill_action(int signo1, siginfo_t *si __unused, void *uctxv) +{ + ucontext_t *uctx = uctxv; + + signo = signo1; + int0x80_loc = uctx->uc_mcontext.mc_rip; +} + +static int +fire(void) +{ + int res; + + asm volatile( + ".globl\tafter_int0x80\n" + "\tint\t$0x80\n" + "after_int0x80:" + : "=a" (res) + : "%0" (SYS_getpid) + : "rdx", "memory", "cc"); + return (res); +} + +int +main(void) +{ + struct sigaction sa; + char signame[SIG2STR_MAX]; + int pid, res; + + res = 0; + + memset(&sa, 0, sizeof(sa)); + sa.sa_sigaction = sigill_action; + sa.sa_flags = SA_SIGINFO; + if (sigaction(SIGBUS, &sa, NULL) == -1) + err(1, "catching SIGBUS"); + + pid = fire(); + atomic_signal_fence(memory_order_seq_cst); + if (int0x80_loc == 0) { + printf("int $0x80 does not raise SIGBUS\n"); + if (pid == getpid()) + printf("and syscall worked\n"); + else + printf("but syscall did not worked\n"); + res = 1; + } else { + sig2str(signo, signame); + printf("int $0x80 raises SIG%s\n", signame); + if (int0x80_loc == (uintptr_t)after_int0x80) { + printf("at expected location\n"); + } else { + printf("not at expected location\n"); + res = 1; + } + } + exit(res); +}home | help
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