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tests/plugin: add sample plugins 

Pass arguments with -plugin=libfoo.so,arg=bar,arg=baz

Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Emilio G. Cota 2018-10-25 12:57:04 -04:00 committed by Alex Bennée
parent f308f64e76
commit 671f760b93
6 changed files with 281 additions and 0 deletions
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1
configure vendored
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@ -7903,6 +7903,7 @@ DIRS="$DIRS roms/seabios roms/vgabios"
LINKS="Makefile"
LINKS="$LINKS tests/tcg/lm32/Makefile po/Makefile"
LINKS="$LINKS tests/tcg/Makefile.target tests/fp/Makefile"
LINKS="$LINKS tests/plugin/Makefile"
LINKS="$LINKS pc-bios/optionrom/Makefile pc-bios/keymaps"
LINKS="$LINKS pc-bios/s390-ccw/Makefile"
LINKS="$LINKS roms/seabios/Makefile roms/vgabios/Makefile"

28
tests/plugin/Makefile Normal file
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@ -0,0 +1,28 @@
BUILD_DIR := $(CURDIR)/../..
include $(BUILD_DIR)/config-host.mak
include $(SRC_PATH)/rules.mak
$(call set-vpath, $(SRC_PATH)/tests/plugin)
NAMES :=
NAMES += bb
NAMES += empty
NAMES += insn
NAMES += mem
SONAMES := $(addsuffix .so,$(addprefix lib,$(NAMES)))
QEMU_CFLAGS += -fPIC
QEMU_CFLAGS += -I$(SRC_PATH)/include/qemu
all: $(SONAMES)
lib%.so: %.o
$(CC) -shared -Wl,-soname,$@ -o $@ $^ $(LDLIBS)
clean:
rm -f *.o *.so *.d
rm -Rf .libs
.PHONY: all clean

64
tests/plugin/bb.c Normal file
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@ -0,0 +1,64 @@
/*
* Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
*
* License: GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include <inttypes.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <glib.h>
#include <qemu-plugin.h>
static uint64_t bb_count;
static uint64_t insn_count;
static bool do_inline;
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
g_autofree gchar *out;
out = g_strdup_printf("bb's: %" PRIu64", insns: %" PRIu64 "\n",
bb_count, insn_count);
qemu_plugin_outs(out);
}
static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
{
unsigned long n_insns = (unsigned long)udata;
insn_count += n_insns;
bb_count++;
}
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{
unsigned long n_insns = qemu_plugin_tb_n_insns(tb);
if (do_inline) {
qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
&bb_count, 1);
qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
&insn_count, n_insns);
} else {
qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
QEMU_PLUGIN_CB_NO_REGS,
(void *)n_insns);
}
}
QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
const qemu_info_t *info,
int argc, char **argv)
{
if (argc && strcmp(argv[0], "inline") == 0) {
do_inline = true;
}
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
return 0;
}

30
tests/plugin/empty.c Normal file
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@ -0,0 +1,30 @@
/*
* Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
*
* License: GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include <inttypes.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <qemu-plugin.h>
/*
* Empty TB translation callback.
* This allows us to measure the overhead of injecting and then
* removing empty instrumentation.
*/
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{ }
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_tb_trans_cb(id, vcpu_tb_trans);
return 0;
}

61
tests/plugin/insn.c Normal file
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@ -0,0 +1,61 @@
/*
* Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
*
* License: GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include <inttypes.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <glib.h>
#include <qemu-plugin.h>
static uint64_t insn_count;
static bool do_inline;
static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
{
insn_count++;
}
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{
size_t n = qemu_plugin_tb_n_insns(tb);
size_t i;
for (i = 0; i < n; i++) {
struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
if (do_inline) {
qemu_plugin_register_vcpu_insn_exec_inline(
insn, QEMU_PLUGIN_INLINE_ADD_U64, &insn_count, 1);
} else {
qemu_plugin_register_vcpu_insn_exec_cb(
insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS, NULL);
}
}
}
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
g_autofree gchar *out;
out = g_strdup_printf("insns: %" PRIu64 "\n", insn_count);
qemu_plugin_outs(out);
}
QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
const qemu_info_t *info,
int argc, char **argv)
{
if (argc && !strcmp(argv[0], "inline")) {
do_inline = true;
}
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
return 0;
}

97
tests/plugin/mem.c Normal file
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@ -0,0 +1,97 @@
/*
* Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
*
* License: GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include <inttypes.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <glib.h>
#include <qemu-plugin.h>
static uint64_t mem_count;
static uint64_t io_count;
static bool do_inline;
static bool do_haddr;
static enum qemu_plugin_mem_rw rw = QEMU_PLUGIN_MEM_RW;
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
g_autoptr(GString) out = g_string_new("");
g_string_printf(out, "mem accesses: %" PRIu64 "\n", mem_count);
if (do_haddr) {
g_string_append_printf(out, "io accesses: %" PRIu64 "\n", mem_count);
}
qemu_plugin_outs(out->str);
}
static void vcpu_mem(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
uint64_t vaddr, void *udata)
{
if (do_haddr) {
struct qemu_plugin_hwaddr *hwaddr;
hwaddr = qemu_plugin_get_hwaddr(meminfo, vaddr);
if (qemu_plugin_hwaddr_is_io(hwaddr)) {
io_count++;
} else {
mem_count++;
}
} else {
mem_count++;
}
}
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{
size_t n = qemu_plugin_tb_n_insns(tb);
size_t i;
for (i = 0; i < n; i++) {
struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
if (do_inline) {
qemu_plugin_register_vcpu_mem_inline(insn, rw,
QEMU_PLUGIN_INLINE_ADD_U64,
&mem_count, 1);
} else {
qemu_plugin_register_vcpu_mem_cb(insn, vcpu_mem,
QEMU_PLUGIN_CB_NO_REGS,
rw, NULL);
}
}
}
QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
const qemu_info_t *info,
int argc, char **argv)
{
if (argc) {
if (argc >= 3) {
if (!strcmp(argv[2], "haddr")) {
do_haddr = true;
}
}
if (argc >= 2) {
const char *str = argv[1];
if (!strcmp(str, "r")) {
rw = QEMU_PLUGIN_MEM_R;
} else if (!strcmp(str, "w")) {
rw = QEMU_PLUGIN_MEM_W;
}
}
if (!strcmp(argv[0], "inline")) {
do_inline = true;
}
}
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
return 0;
}