e025d799af
A duplicate insn is one that is appears to be executed twice in a row. This is currently possible due to -icount and cpu_io_recompile() causing a re-translation of a block. On it's own this won't trigger any tests though. The heuristics that the plugin use can't deal with the x86 rep instruction which (validly) will look like executing the same instruction several times. To avoid problems later we tweak the rules for x86 to run the "inline" version of the plugin. This also has the advantage of increasing coverage of the plugin code (see bugfix in previous commit). Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20210213130325.14781-15-alex.bennee@linaro.org>
73 lines
2 KiB
C
73 lines
2 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 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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}
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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_autofree gchar *out = g_strdup_printf("insns: %" PRIu64 "\n", insn_count);
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qemu_plugin_outs(out);
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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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if (argc && !strcmp(argv[0], "inline")) {
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do_inline = true;
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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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