In user-mode emulation there is a small race between preexit_cleanup and exit_group() which means we may end up calling instrumented instructions before the kernel reaps child threads. To solve this we implement a new helper which ensures the callbacks are flushed along with any translations before we let the host do it's a thing. While we are at it make the documentation of qemu_plugin_register_atexit_cb clearer as to what the user can expect. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Mahmoud Mandour <ma.mandourr@gmail.com> Acked-by: Warner Losh <imp@bsdimp.com> Message-Id: <20210720232703.10650-21-alex.bennee@linaro.org>
581 lines
19 KiB
C
581 lines
19 KiB
C
/*
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* Copyright (C) 2017, Emilio G. Cota <cota@braap.org>
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* Copyright (C) 2019, Linaro
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*
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* License: GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef QEMU_PLUGIN_API_H
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#define QEMU_PLUGIN_API_H
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stddef.h>
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/*
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* For best performance, build the plugin with -fvisibility=hidden so that
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* QEMU_PLUGIN_LOCAL is implicit. Then, just mark qemu_plugin_install with
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* QEMU_PLUGIN_EXPORT. For more info, see
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* https://gcc.gnu.org/wiki/Visibility
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*/
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#if defined _WIN32 || defined __CYGWIN__
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#ifdef BUILDING_DLL
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#define QEMU_PLUGIN_EXPORT __declspec(dllexport)
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#else
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#define QEMU_PLUGIN_EXPORT __declspec(dllimport)
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#endif
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#define QEMU_PLUGIN_LOCAL
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#else
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#define QEMU_PLUGIN_EXPORT __attribute__((visibility("default")))
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#define QEMU_PLUGIN_LOCAL __attribute__((visibility("hidden")))
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#endif
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/**
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* typedef qemu_plugin_id_t - Unique plugin ID
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*/
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typedef uint64_t qemu_plugin_id_t;
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/*
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* Versioning plugins:
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*
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* The plugin API will pass a minimum and current API version that
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* QEMU currently supports. The minimum API will be incremented if an
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* API needs to be deprecated.
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*
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* The plugins export the API they were built against by exposing the
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* symbol qemu_plugin_version which can be checked.
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*/
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extern QEMU_PLUGIN_EXPORT int qemu_plugin_version;
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#define QEMU_PLUGIN_VERSION 1
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/**
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* struct qemu_info_t - system information for plugins
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*
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* This structure provides for some limited information about the
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* system to allow the plugin to make decisions on how to proceed. For
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* example it might only be suitable for running on some guest
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* architectures or when under full system emulation.
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*/
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typedef struct qemu_info_t {
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/** @target_name: string describing architecture */
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const char *target_name;
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/** @version: minimum and current plugin API level */
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struct {
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int min;
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int cur;
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} version;
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/** @system_emulation: is this a full system emulation? */
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bool system_emulation;
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union {
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/** @system: information relevant to system emulation */
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struct {
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/** @system.smp_vcpus: initial number of vCPUs */
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int smp_vcpus;
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/** @system.max_vcpus: maximum possible number of vCPUs */
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int max_vcpus;
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} system;
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};
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} qemu_info_t;
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/**
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* qemu_plugin_install() - Install a plugin
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* @id: this plugin's opaque ID
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* @info: a block describing some details about the guest
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* @argc: number of arguments
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* @argv: array of arguments (@argc elements)
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*
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* All plugins must export this symbol which is called when the plugin
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* is first loaded. Calling qemu_plugin_uninstall() from this function
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* is a bug.
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*
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* Note: @info is only live during the call. Copy any information we
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* want to keep. @argv remains valid throughout the lifetime of the
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* loaded plugin.
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*
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* Return: 0 on successful loading, !0 for an error.
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*/
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QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
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const qemu_info_t *info,
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int argc, char **argv);
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/**
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* typedef qemu_plugin_simple_cb_t - simple callback
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* @id: the unique qemu_plugin_id_t
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*
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* This callback passes no information aside from the unique @id.
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*/
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typedef void (*qemu_plugin_simple_cb_t)(qemu_plugin_id_t id);
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/**
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* typedef qemu_plugin_udata_cb_t - callback with user data
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* @id: the unique qemu_plugin_id_t
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* @userdata: a pointer to some user data supplied when the callback
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* was registered.
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*/
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typedef void (*qemu_plugin_udata_cb_t)(qemu_plugin_id_t id, void *userdata);
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/**
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* typedef qemu_plugin_vcpu_simple_cb_t - vcpu callback
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* @id: the unique qemu_plugin_id_t
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* @vcpu_index: the current vcpu context
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*/
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typedef void (*qemu_plugin_vcpu_simple_cb_t)(qemu_plugin_id_t id,
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unsigned int vcpu_index);
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/**
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* typedef qemu_plugin_vcpu_udata_cb_t - vcpu callback
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* @vcpu_index: the current vcpu context
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* @userdata: a pointer to some user data supplied when the callback
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* was registered.
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*/
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typedef void (*qemu_plugin_vcpu_udata_cb_t)(unsigned int vcpu_index,
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void *userdata);
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/**
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* qemu_plugin_uninstall() - Uninstall a plugin
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* @id: this plugin's opaque ID
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* @cb: callback to be called once the plugin has been removed
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*
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* Do NOT assume that the plugin has been uninstalled once this function
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* returns. Plugins are uninstalled asynchronously, and therefore the given
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* plugin receives callbacks until @cb is called.
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*
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* Note: Calling this function from qemu_plugin_install() is a bug.
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*/
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void qemu_plugin_uninstall(qemu_plugin_id_t id, qemu_plugin_simple_cb_t cb);
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/**
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* qemu_plugin_reset() - Reset a plugin
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* @id: this plugin's opaque ID
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* @cb: callback to be called once the plugin has been reset
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*
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* Unregisters all callbacks for the plugin given by @id.
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*
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* Do NOT assume that the plugin has been reset once this function returns.
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* Plugins are reset asynchronously, and therefore the given plugin receives
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* callbacks until @cb is called.
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*/
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void qemu_plugin_reset(qemu_plugin_id_t id, qemu_plugin_simple_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_init_cb() - register a vCPU initialization callback
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a vCPU is initialized.
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*
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* See also: qemu_plugin_register_vcpu_exit_cb()
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*/
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void qemu_plugin_register_vcpu_init_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_exit_cb() - register a vCPU exit callback
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a vCPU exits.
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*
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* See also: qemu_plugin_register_vcpu_init_cb()
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*/
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void qemu_plugin_register_vcpu_exit_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_idle_cb() - register a vCPU idle callback
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a vCPU idles.
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*/
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void qemu_plugin_register_vcpu_idle_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_resume_cb() - register a vCPU resume callback
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a vCPU resumes execution.
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*/
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void qemu_plugin_register_vcpu_resume_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_simple_cb_t cb);
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/** struct qemu_plugin_tb - Opaque handle for a translation block */
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struct qemu_plugin_tb;
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/** struct qemu_plugin_insn - Opaque handle for a translated instruction */
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struct qemu_plugin_insn;
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/**
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* enum qemu_plugin_cb_flags - type of callback
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*
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* @QEMU_PLUGIN_CB_NO_REGS: callback does not access the CPU's regs
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* @QEMU_PLUGIN_CB_R_REGS: callback reads the CPU's regs
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* @QEMU_PLUGIN_CB_RW_REGS: callback reads and writes the CPU's regs
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*
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* Note: currently unused, plugins cannot read or change system
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* register state.
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*/
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enum qemu_plugin_cb_flags {
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QEMU_PLUGIN_CB_NO_REGS,
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QEMU_PLUGIN_CB_R_REGS,
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QEMU_PLUGIN_CB_RW_REGS,
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};
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enum qemu_plugin_mem_rw {
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QEMU_PLUGIN_MEM_R = 1,
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QEMU_PLUGIN_MEM_W,
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QEMU_PLUGIN_MEM_RW,
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};
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/**
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* typedef qemu_plugin_vcpu_tb_trans_cb_t - translation callback
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* @id: unique plugin id
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* @tb: opaque handle used for querying and instrumenting a block.
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*/
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typedef void (*qemu_plugin_vcpu_tb_trans_cb_t)(qemu_plugin_id_t id,
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struct qemu_plugin_tb *tb);
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/**
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* qemu_plugin_register_vcpu_tb_trans_cb() - register a translate cb
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* @id: plugin ID
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* @cb: callback function
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*
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* The @cb function is called every time a translation occurs. The @cb
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* function is passed an opaque qemu_plugin_type which it can query
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* for additional information including the list of translated
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* instructions. At this point the plugin can register further
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* callbacks to be triggered when the block or individual instruction
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* executes.
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*/
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void qemu_plugin_register_vcpu_tb_trans_cb(qemu_plugin_id_t id,
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qemu_plugin_vcpu_tb_trans_cb_t cb);
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/**
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* qemu_plugin_register_vcpu_tb_exec_cb() - register execution callback
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* @tb: the opaque qemu_plugin_tb handle for the translation
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* @cb: callback function
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* @flags: does the plugin read or write the CPU's registers?
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* @userdata: any plugin data to pass to the @cb?
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*
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* The @cb function is called every time a translated unit executes.
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*/
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void qemu_plugin_register_vcpu_tb_exec_cb(struct qemu_plugin_tb *tb,
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qemu_plugin_vcpu_udata_cb_t cb,
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enum qemu_plugin_cb_flags flags,
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void *userdata);
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/**
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* enum qemu_plugin_op - describes an inline op
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*
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* @QEMU_PLUGIN_INLINE_ADD_U64: add an immediate value uint64_t
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*
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* Note: currently only a single inline op is supported.
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*/
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enum qemu_plugin_op {
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QEMU_PLUGIN_INLINE_ADD_U64,
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};
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/**
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* qemu_plugin_register_vcpu_tb_exec_inline() - execution inline op
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* @tb: the opaque qemu_plugin_tb handle for the translation
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* @op: the type of qemu_plugin_op (e.g. ADD_U64)
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* @ptr: the target memory location for the op
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* @imm: the op data (e.g. 1)
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*
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* Insert an inline op to every time a translated unit executes.
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* Useful if you just want to increment a single counter somewhere in
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* memory.
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*
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* Note: ops are not atomic so in multi-threaded/multi-smp situations
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* you will get inexact results.
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*/
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void qemu_plugin_register_vcpu_tb_exec_inline(struct qemu_plugin_tb *tb,
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enum qemu_plugin_op op,
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void *ptr, uint64_t imm);
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/**
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* qemu_plugin_register_vcpu_insn_exec_cb() - register insn execution cb
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* @insn: the opaque qemu_plugin_insn handle for an instruction
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* @cb: callback function
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* @flags: does the plugin read or write the CPU's registers?
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* @userdata: any plugin data to pass to the @cb?
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*
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* The @cb function is called every time an instruction is executed
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*/
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void qemu_plugin_register_vcpu_insn_exec_cb(struct qemu_plugin_insn *insn,
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qemu_plugin_vcpu_udata_cb_t cb,
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enum qemu_plugin_cb_flags flags,
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void *userdata);
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/**
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* qemu_plugin_register_vcpu_insn_exec_inline() - insn execution inline op
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* @insn: the opaque qemu_plugin_insn handle for an instruction
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* @op: the type of qemu_plugin_op (e.g. ADD_U64)
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* @ptr: the target memory location for the op
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* @imm: the op data (e.g. 1)
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*
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* Insert an inline op to every time an instruction executes. Useful
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* if you just want to increment a single counter somewhere in memory.
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*/
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void qemu_plugin_register_vcpu_insn_exec_inline(struct qemu_plugin_insn *insn,
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enum qemu_plugin_op op,
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void *ptr, uint64_t imm);
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/**
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* qemu_plugin_tb_n_insns() - query helper for number of insns in TB
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* @tb: opaque handle to TB passed to callback
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*
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* Returns: number of instructions in this block
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*/
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size_t qemu_plugin_tb_n_insns(const struct qemu_plugin_tb *tb);
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/**
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* qemu_plugin_tb_vaddr() - query helper for vaddr of TB start
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* @tb: opaque handle to TB passed to callback
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*
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* Returns: virtual address of block start
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*/
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uint64_t qemu_plugin_tb_vaddr(const struct qemu_plugin_tb *tb);
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/**
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* qemu_plugin_tb_get_insn() - retrieve handle for instruction
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* @tb: opaque handle to TB passed to callback
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* @idx: instruction number, 0 indexed
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*
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* The returned handle can be used in follow up helper queries as well
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* as when instrumenting an instruction. It is only valid for the
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* lifetime of the callback.
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*
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* Returns: opaque handle to instruction
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*/
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struct qemu_plugin_insn *
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qemu_plugin_tb_get_insn(const struct qemu_plugin_tb *tb, size_t idx);
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/**
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* qemu_plugin_insn_data() - return ptr to instruction data
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* @insn: opaque instruction handle from qemu_plugin_tb_get_insn()
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*
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* Note: data is only valid for duration of callback. See
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* qemu_plugin_insn_size() to calculate size of stream.
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*
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* Returns: pointer to a stream of bytes containing the value of this
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* instructions opcode.
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*/
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const void *qemu_plugin_insn_data(const struct qemu_plugin_insn *insn);
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/**
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* qemu_plugin_insn_size() - return size of instruction
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* @insn: opaque instruction handle from qemu_plugin_tb_get_insn()
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*
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* Returns: size of instruction in bytes
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*/
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size_t qemu_plugin_insn_size(const struct qemu_plugin_insn *insn);
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/**
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* qemu_plugin_insn_vaddr() - return vaddr of instruction
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* @insn: opaque instruction handle from qemu_plugin_tb_get_insn()
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*
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* Returns: virtual address of instruction
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*/
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uint64_t qemu_plugin_insn_vaddr(const struct qemu_plugin_insn *insn);
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/**
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* qemu_plugin_insn_haddr() - return hardware addr of instruction
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* @insn: opaque instruction handle from qemu_plugin_tb_get_insn()
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*
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* Returns: hardware (physical) target address of instruction
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*/
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void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn);
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/**
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* typedef qemu_plugin_meminfo_t - opaque memory transaction handle
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*
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* This can be further queried using the qemu_plugin_mem_* query
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* functions.
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*/
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typedef uint32_t qemu_plugin_meminfo_t;
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/** struct qemu_plugin_hwaddr - opaque hw address handle */
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struct qemu_plugin_hwaddr;
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/**
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* qemu_plugin_mem_size_shift() - get size of access
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* @info: opaque memory transaction handle
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*
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* Returns: size of access in ^2 (0=byte, 1=16bit, 2=32bit etc...)
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*/
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unsigned int qemu_plugin_mem_size_shift(qemu_plugin_meminfo_t info);
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/**
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* qemu_plugin_mem_is_sign_extended() - was the access sign extended
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* @info: opaque memory transaction handle
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*
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* Returns: true if it was, otherwise false
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*/
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bool qemu_plugin_mem_is_sign_extended(qemu_plugin_meminfo_t info);
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/**
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* qemu_plugin_mem_is_big_endian() - was the access big endian
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* @info: opaque memory transaction handle
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*
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* Returns: true if it was, otherwise false
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*/
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bool qemu_plugin_mem_is_big_endian(qemu_plugin_meminfo_t info);
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/**
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* qemu_plugin_mem_is_store() - was the access a store
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* @info: opaque memory transaction handle
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*
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* Returns: true if it was, otherwise false
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*/
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bool qemu_plugin_mem_is_store(qemu_plugin_meminfo_t info);
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/**
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* qemu_plugin_get_hwaddr() - return handle for memory operation
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* @info: opaque memory info structure
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* @vaddr: the virtual address of the memory operation
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*
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* For system emulation returns a qemu_plugin_hwaddr handle to query
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* details about the actual physical address backing the virtual
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* address. For linux-user guests it just returns NULL.
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*
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* This handle is *only* valid for the duration of the callback. Any
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* information about the handle should be recovered before the
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* callback returns.
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*/
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struct qemu_plugin_hwaddr *qemu_plugin_get_hwaddr(qemu_plugin_meminfo_t info,
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uint64_t vaddr);
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/*
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* The following additional queries can be run on the hwaddr structure to
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* return information about it - namely whether it is for an IO access and the
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* physical address associated with the access.
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*/
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/**
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* qemu_plugin_hwaddr_is_io() - query whether memory operation is IO
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* @haddr: address handle from qemu_plugin_get_hwaddr()
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*
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* Returns true if the handle's memory operation is to memory-mapped IO, or
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* false if it is to RAM
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*/
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bool qemu_plugin_hwaddr_is_io(const struct qemu_plugin_hwaddr *haddr);
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/**
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* qemu_plugin_hwaddr_phys_addr() - query physical address for memory operation
|
|
* @haddr: address handle from qemu_plugin_get_hwaddr()
|
|
*
|
|
* Returns the physical address associated with the memory operation
|
|
*
|
|
* Note that the returned physical address may not be unique if you are dealing
|
|
* with multiple address spaces.
|
|
*/
|
|
uint64_t qemu_plugin_hwaddr_phys_addr(const struct qemu_plugin_hwaddr *haddr);
|
|
|
|
/*
|
|
* Returns a string representing the device. The string is valid for
|
|
* the lifetime of the plugin.
|
|
*/
|
|
const char *qemu_plugin_hwaddr_device_name(const struct qemu_plugin_hwaddr *h);
|
|
|
|
typedef void
|
|
(*qemu_plugin_vcpu_mem_cb_t)(unsigned int vcpu_index,
|
|
qemu_plugin_meminfo_t info, uint64_t vaddr,
|
|
void *userdata);
|
|
|
|
void qemu_plugin_register_vcpu_mem_cb(struct qemu_plugin_insn *insn,
|
|
qemu_plugin_vcpu_mem_cb_t cb,
|
|
enum qemu_plugin_cb_flags flags,
|
|
enum qemu_plugin_mem_rw rw,
|
|
void *userdata);
|
|
|
|
void qemu_plugin_register_vcpu_mem_inline(struct qemu_plugin_insn *insn,
|
|
enum qemu_plugin_mem_rw rw,
|
|
enum qemu_plugin_op op, void *ptr,
|
|
uint64_t imm);
|
|
|
|
|
|
|
|
typedef void
|
|
(*qemu_plugin_vcpu_syscall_cb_t)(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);
|
|
|
|
void qemu_plugin_register_vcpu_syscall_cb(qemu_plugin_id_t id,
|
|
qemu_plugin_vcpu_syscall_cb_t cb);
|
|
|
|
typedef void
|
|
(*qemu_plugin_vcpu_syscall_ret_cb_t)(qemu_plugin_id_t id, unsigned int vcpu_idx,
|
|
int64_t num, int64_t ret);
|
|
|
|
void
|
|
qemu_plugin_register_vcpu_syscall_ret_cb(qemu_plugin_id_t id,
|
|
qemu_plugin_vcpu_syscall_ret_cb_t cb);
|
|
|
|
|
|
/**
|
|
* qemu_plugin_insn_disas() - return disassembly string for instruction
|
|
* @insn: instruction reference
|
|
*
|
|
* Returns an allocated string containing the disassembly
|
|
*/
|
|
|
|
char *qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn);
|
|
|
|
/**
|
|
* qemu_plugin_insn_symbol() - best effort symbol lookup
|
|
* @insn: instruction reference
|
|
*
|
|
* Return a static string referring to the symbol. This is dependent
|
|
* on the binary QEMU is running having provided a symbol table.
|
|
*/
|
|
const char *qemu_plugin_insn_symbol(const struct qemu_plugin_insn *insn);
|
|
|
|
/**
|
|
* qemu_plugin_vcpu_for_each() - iterate over the existing vCPU
|
|
* @id: plugin ID
|
|
* @cb: callback function
|
|
*
|
|
* The @cb function is called once for each existing vCPU.
|
|
*
|
|
* See also: qemu_plugin_register_vcpu_init_cb()
|
|
*/
|
|
void qemu_plugin_vcpu_for_each(qemu_plugin_id_t id,
|
|
qemu_plugin_vcpu_simple_cb_t cb);
|
|
|
|
void qemu_plugin_register_flush_cb(qemu_plugin_id_t id,
|
|
qemu_plugin_simple_cb_t cb);
|
|
|
|
/**
|
|
* qemu_plugin_register_atexit_cb() - register exit callback
|
|
* @id: plugin ID
|
|
* @cb: callback
|
|
* @userdata: user data for callback
|
|
*
|
|
* The @cb function is called once execution has finished. Plugins
|
|
* should be able to free all their resources at this point much like
|
|
* after a reset/uninstall callback is called.
|
|
*
|
|
* In user-mode it is possible a few un-instrumented instructions from
|
|
* child threads may run before the host kernel reaps the threads.
|
|
*/
|
|
void qemu_plugin_register_atexit_cb(qemu_plugin_id_t id,
|
|
qemu_plugin_udata_cb_t cb, void *userdata);
|
|
|
|
/* returns -1 in user-mode */
|
|
int qemu_plugin_n_vcpus(void);
|
|
|
|
/* returns -1 in user-mode */
|
|
int qemu_plugin_n_max_vcpus(void);
|
|
|
|
/**
|
|
* qemu_plugin_outs() - output string via QEMU's logging system
|
|
* @string: a string
|
|
*/
|
|
void qemu_plugin_outs(const char *string);
|
|
|
|
#endif /* QEMU_PLUGIN_API_H */
|