On 7/12/24 01:03, Simon Hamelin wrote:
This new plugin allows to stop emulation using conditions on the
emulation state. By setting this plugin arguments, it is possible
to set an instruction count limit and/or trigger address(es) to stop at.
The code returned at emulation exit can be customized.
This plugin demonstrates how someone could stop QEMU execution.
It could be used for research purposes to launch some code and
deterministically stop it and understand where its execution flow went.
Co-authored-by: Alexandre Iooss <erdn...@crans.org>
Signed-off-by: Simon Hamelin <simon.hame...@grenoble-inp.org>
Signed-off-by: Alexandre Iooss <erdn...@crans.org>
---
v2:
- use a scoreboard for counting instructions
- no longer hook each instruction to exit at given address
- add `exit_emulation` function for future use case such as stopping the VM
or triggering a gdbstub exception
v3:
- add missing glib include
- refactor code to print exit address when icount is reached
contrib/plugins/Makefile | 1 +
contrib/plugins/stoptrigger.c | 158 ++++++++++++++++++++++++++++++++++
docs/devel/tcg-plugins.rst | 22 +++++
3 files changed, 181 insertions(+)
create mode 100644 contrib/plugins/stoptrigger.c
diff --git a/contrib/plugins/Makefile b/contrib/plugins/Makefile
index 449ead1130..98a89d5c40 100644
--- a/contrib/plugins/Makefile
+++ b/contrib/plugins/Makefile
@@ -28,6 +28,7 @@ NAMES += hwprofile
NAMES += cache
NAMES += drcov
NAMES += ips
+NAMES += stoptrigger
ifeq ($(CONFIG_WIN32),y)
SO_SUFFIX := .dll
diff --git a/contrib/plugins/stoptrigger.c b/contrib/plugins/stoptrigger.c
new file mode 100644
index 0000000000..490afbcbaf
--- /dev/null
+++ b/contrib/plugins/stoptrigger.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2024, Simon Hamelin <simon.hame...@grenoble-inp.org>
+ *
+ * Stop execution once a given address is reached or if the
+ * count of executed instructions reached a specified limit
+ *
+ * License: GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <assert.h>
+#include <glib.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <qemu-plugin.h>
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
+/* Scoreboard to track executed instructions count */
+typedef struct {
+ uint64_t insn_count;
+} InstructionsCount;
+static struct qemu_plugin_scoreboard *insn_count_sb;
+static qemu_plugin_u64 insn_count;
+
+static uint64_t icount;
+static int icount_exit_code;
+
+static bool exit_on_icount;
+static bool exit_on_address;
+
+/* Map trigger addresses to exit code */
+static GHashTable *addrs_ht;
+static GMutex addrs_ht_lock;
+
+static void exit_emulation(int return_code, char *message)
+{
+ qemu_plugin_outs(message);
+ g_free(message);
+ exit(return_code);
+}
+
+static void exit_icount_reached(unsigned int cpu_index, void *udata)
+{
+ uint64_t insn_vaddr = GPOINTER_TO_UINT(udata);
+ char *msg = g_strdup_printf("icount reached at 0x%" PRIx64 ", exiting\n",
+ insn_vaddr);
+
+ exit_emulation(icount_exit_code, msg);
+}
+
+static void exit_address_reached(unsigned int cpu_index, void *udata)
+{
+ uint64_t insn_vaddr = GPOINTER_TO_UINT(udata);
+ char *msg = g_strdup_printf("0x%" PRIx64 " reached, exiting\n",
insn_vaddr);
+ int exit_code;
+
+ g_mutex_lock(&addrs_ht_lock);
+ exit_code = GPOINTER_TO_INT(
+ g_hash_table_lookup(addrs_ht, GUINT_TO_POINTER(insn_vaddr)));
+ g_mutex_unlock(&addrs_ht_lock);
This hashtable is read only after qemu_plugin_install, so you can safely
remove this lock.
+
+ exit_emulation(exit_code, msg);
+}
+
+static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
+{
+ size_t tb_n = qemu_plugin_tb_n_insns(tb);
+ for (size_t i = 0; i < tb_n; i++) {
+ struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
+ gpointer insn_vaddr = GUINT_TO_POINTER(qemu_plugin_insn_vaddr(insn));
+
+ if (exit_on_icount) {
+ /* Increment and check scoreboard for each instruction */
+ qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu(
+ insn, QEMU_PLUGIN_INLINE_ADD_U64, insn_count, 1);
+ qemu_plugin_register_vcpu_insn_exec_cond_cb(
+ insn, exit_icount_reached, QEMU_PLUGIN_CB_NO_REGS,
+ QEMU_PLUGIN_COND_EQ, insn_count, icount + 1, insn_vaddr);
+ }
+
+ if (exit_on_address) {
+ g_mutex_lock(&addrs_ht_lock);
+ if (g_hash_table_contains(addrs_ht, insn_vaddr)) {
+ /* Exit triggered by address */
+ qemu_plugin_register_vcpu_insn_exec_cb(
+ insn, exit_address_reached, QEMU_PLUGIN_CB_NO_REGS,
+ insn_vaddr);
+ }
+ g_mutex_unlock(&addrs_ht_lock);
Same as before, it would avoid the need to lock in the (hot) translation
path. This should be faster.
+ }
+ }
+}
+
+static void plugin_exit(qemu_plugin_id_t id, void *p)
+{
+ g_hash_table_destroy(addrs_ht);
+ qemu_plugin_scoreboard_free(insn_count_sb);
+}
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
+ const qemu_info_t *info, int argc,
+ char **argv)
+{
+ addrs_ht = g_hash_table_new(NULL, g_direct_equal);
+
+ insn_count_sb = qemu_plugin_scoreboard_new(sizeof(InstructionsCount));
+ insn_count = qemu_plugin_scoreboard_u64_in_struct(
+ insn_count_sb, InstructionsCount, insn_count);
+
+ for (int i = 0; i < argc; i++) {
+ char *opt = argv[i];
+ g_auto(GStrv) tokens = g_strsplit(opt, "=", 2);
+ if (g_strcmp0(tokens[0], "icount") == 0) {
+ g_auto(GStrv) icount_tokens = g_strsplit(tokens[1], ":", 2);
+ icount = g_ascii_strtoull(icount_tokens[0], NULL, 0);
+ if (icount < 1 || g_strrstr(icount_tokens[0], "-") != NULL) {
+ fprintf(stderr,
+ "icount parsing failed: '%s' must be a positive "
+ "integer\n",
+ icount_tokens[0]);
+ return -1;
+ }
+ if (icount_tokens[1]) {
+ icount_exit_code = g_ascii_strtoull(icount_tokens[1], NULL, 0);
+ }
+ exit_on_icount = true;
+ } else if (g_strcmp0(tokens[0], "addr") == 0) {
+ g_auto(GStrv) addr_tokens = g_strsplit(tokens[1], ":", 2);
+ uint64_t exit_addr = g_ascii_strtoull(addr_tokens[0], NULL, 0);
+ int exit_code = 0;
+ if (addr_tokens[1]) {
+ exit_code = g_ascii_strtoull(addr_tokens[1], NULL, 0);
+ }
+ g_mutex_lock(&addrs_ht_lock);
+ g_hash_table_insert(addrs_ht, GUINT_TO_POINTER(exit_addr),
+ GINT_TO_POINTER(exit_code));
+ g_mutex_unlock(&addrs_ht_lock);
qemu_plugin_install will be called before any other callbacks, so no
need to lock.
+ exit_on_address = true;
+ } else {
+ fprintf(stderr, "option parsing failed: %s\n", opt);
+ return -1;
+ }
+ }
+
+ if (!exit_on_icount && !exit_on_address) {
+ fprintf(stderr, "'icount' or 'addr' argument missing\n");
+ return -1;
+ }
+
+ /* Register translation block and exit callbacks */
+ qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
+ qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
+
+ return 0;
+}
diff --git a/docs/devel/tcg-plugins.rst b/docs/devel/tcg-plugins.rst
index f7d7b9e3a4..954623f9bf 100644
--- a/docs/devel/tcg-plugins.rst
+++ b/docs/devel/tcg-plugins.rst
@@ -642,6 +642,28 @@ The plugin has a number of arguments, all of them are
optional:
configuration arguments implies ``l2=on``.
(default: N = 2097152 (2MB), B = 64, A = 16)
+- contrib/plugins/stoptrigger.c
+
+The stoptrigger plugin allows to setup triggers to stop emulation.
+It can be used for research purposes to launch some code and precisely stop it
+and understand where its execution flow went.
+
+Two types of triggers can be configured: a count of instructions to stop at,
+or an address to stop at. Multiple triggers can be set at once.
+
+By default, QEMU will exit with return code 0. A custom return code can be
+configured for each trigger using ``:CODE`` syntax.
+
+For example, to stop at the 20-th instruction with return code 41, at address
+0xd4 with return code 0 or at address 0xd8 with return code 42::
+
+ $ qemu-system-aarch64 $(QEMU_ARGS) \
+ -plugin
./contrib/plugins/libstoptrigger.so,icount=20:41,addr=0xd4,addr=0xd8:42 -d
plugin
+
+The plugin will log the reason of exit, for example::
+
+ 0xd4 reached, exiting
+
Plugin API
==========
Pierrick
