e83f79b3fa
This is mostly a convenience feature for identifying frontends that do multiple repeat loads so I can test changes to the instruction tracking interface. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20211026102234.3961636-20-alex.bennee@linaro.org>
116 lines
3.5 KiB
C
116 lines
3.5 KiB
C
/*
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* Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
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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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#include <inttypes.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <glib.h>
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#include <qemu-plugin.h>
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QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
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static uint64_t insn_count;
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static bool do_inline;
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static bool do_size;
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static GArray *sizes;
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static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
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{
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static uint64_t last_pc;
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uint64_t this_pc = GPOINTER_TO_UINT(udata);
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if (this_pc == last_pc) {
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g_autofree gchar *out = g_strdup_printf("detected repeat execution @ 0x%"
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PRIx64 "\n", this_pc);
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qemu_plugin_outs(out);
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}
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last_pc = this_pc;
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insn_count++;
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}
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static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
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{
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size_t n = qemu_plugin_tb_n_insns(tb);
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size_t i;
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for (i = 0; i < n; i++) {
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struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
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if (do_inline) {
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qemu_plugin_register_vcpu_insn_exec_inline(
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insn, QEMU_PLUGIN_INLINE_ADD_U64, &insn_count, 1);
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} else {
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uint64_t vaddr = qemu_plugin_insn_vaddr(insn);
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qemu_plugin_register_vcpu_insn_exec_cb(
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insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS,
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GUINT_TO_POINTER(vaddr));
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}
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if (do_size) {
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size_t sz = qemu_plugin_insn_size(insn);
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if (sz > sizes->len) {
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g_array_set_size(sizes, sz);
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}
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unsigned long *cnt = &g_array_index(sizes, unsigned long, sz);
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(*cnt)++;
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}
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}
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}
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static void plugin_exit(qemu_plugin_id_t id, void *p)
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{
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g_autoptr(GString) out = g_string_new(NULL);
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if (do_size) {
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int i;
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for (i = 0; i <= sizes->len; i++) {
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unsigned long *cnt = &g_array_index(sizes, unsigned long, i);
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if (*cnt) {
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g_string_append_printf(out,
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"len %d bytes: %ld insns\n", i, *cnt);
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}
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}
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} else {
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g_string_append_printf(out, "insns: %" PRIu64 "\n", insn_count);
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}
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qemu_plugin_outs(out->str);
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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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for (int i = 0; i < argc; i++) {
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char *opt = argv[i];
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g_autofree char **tokens = g_strsplit(opt, "=", 2);
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if (g_strcmp0(tokens[0], "inline") == 0) {
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if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
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fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
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return -1;
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}
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} else if (g_strcmp0(tokens[0], "sizes") == 0) {
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if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_size)) {
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fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
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return -1;
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}
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} else {
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fprintf(stderr, "option parsing failed: %s\n", opt);
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return -1;
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}
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}
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if (do_size) {
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sizes = g_array_new(true, true, sizeof(unsigned long));
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}
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qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
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qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
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return 0;
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}
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