From 279d0a5b1e6b81f88f95b889de8356a331ea8380 Mon Sep 17 00:00:00 2001 From: Matthias Weckbecker Date: Fri, 12 Mar 2021 17:28:08 +0000 Subject: [PATCH] plugins: new syscalls plugin MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This commit adds a new syscalls plugin that displays the syscalls as they are executed and returned. This plugin outputs the number of the syscall as well as the syscall return value. Works in *-user only. Essentially, this commit restores: https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg00846.html by using the new QEMU plugin API. Signed-off-by: Matthias Weckbecker Signed-off-by: Alex Bennée Message-Id: <20200812115816.4454-1-matthias@weckbecker.name> Message-Id: <20210312172821.31647-2-alex.bennee@linaro.org> --- tests/plugin/meson.build | 2 +- tests/plugin/syscall.c | 49 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+), 1 deletion(-) create mode 100644 tests/plugin/syscall.c diff --git a/tests/plugin/meson.build b/tests/plugin/meson.build index 1eacfa6e35..2bbfc4b19e 100644 --- a/tests/plugin/meson.build +++ b/tests/plugin/meson.build @@ -1,5 +1,5 @@ t = [] -foreach i : ['bb', 'empty', 'insn', 'mem'] +foreach i : ['bb', 'empty', 'insn', 'mem', 'syscall'] t += shared_module(i, files(i + '.c'), include_directories: '../../include/qemu', dependencies: glib) diff --git a/tests/plugin/syscall.c b/tests/plugin/syscall.c new file mode 100644 index 0000000000..53ee2ab6c4 --- /dev/null +++ b/tests/plugin/syscall.c @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2020, Matthias Weckbecker + * + * License: GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ +#include +#include +#include +#include +#include +#include +#include + +#include + +QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION; + +static void vcpu_syscall(qemu_plugin_id_t id, unsigned int vcpu_index, + int64_t num, uint64_t a1, uint64_t a2, + uint64_t a3, uint64_t a4, uint64_t a5, + uint64_t a6, uint64_t a7, uint64_t a8) +{ + g_autofree gchar *out = g_strdup_printf("syscall #%" PRIi64 "\n", num); + qemu_plugin_outs(out); +} + +static void vcpu_syscall_ret(qemu_plugin_id_t id, unsigned int vcpu_idx, + int64_t num, int64_t ret) +{ + g_autofree gchar *out; + out = g_strdup_printf("syscall #%" PRIi64 " returned -> %" PRIi64 "\n", + num, ret); + qemu_plugin_outs(out); +} + +/* ************************************************************************* */ + +static void plugin_exit(qemu_plugin_id_t id, void *p) {} + +QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id, + const qemu_info_t *info, + int argc, char **argv) +{ + qemu_plugin_register_vcpu_syscall_cb(id, vcpu_syscall); + qemu_plugin_register_vcpu_syscall_ret_cb(id, vcpu_syscall_ret); + qemu_plugin_register_atexit_cb(id, plugin_exit, NULL); + return 0; +}