From 5584e2dbe8c9c95ceb178786fb88e5edf625e1b6 Mon Sep 17 00:00:00 2001
From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: Thu, 12 Jan 2023 16:20:13 +0100
Subject: tcg: add perfmap and jitdump
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Add ability to dump /tmp/perf-<pid>.map and jit-<pid>.dump.
The first one allows the perf tool to map samples to each individual
translation block. The second one adds the ability to resolve symbol
names, line numbers and inspect JITed code.

Example of use:

    perf record qemu-x86_64 -perfmap ./a.out
    perf report

or

    perf record -k 1 qemu-x86_64 -jitdump ./a.out
    DEBUGINFOD_URLS= perf inject -j -i perf.data -o perf.data.jitted
    perf report -i perf.data.jitted

Co-developed-by: Vanderson M. do Rosario <vandersonmr2@gmail.com>
Co-developed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230112152013.125680-4-iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/exit.c |  2 ++
 linux-user/main.c | 15 +++++++++++++++
 2 files changed, 17 insertions(+)

(limited to 'linux-user')

diff --git a/linux-user/exit.c b/linux-user/exit.c
index fa6ef0b..607b6da 100644
--- a/linux-user/exit.c
+++ b/linux-user/exit.c
@@ -17,6 +17,7 @@
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "qemu/osdep.h"
+#include "accel/tcg/perf.h"
 #include "exec/gdbstub.h"
 #include "qemu.h"
 #include "user-internals.h"
@@ -38,4 +39,5 @@ void preexit_cleanup(CPUArchState *env, int code)
 #endif
         gdb_exit(code);
         qemu_plugin_user_exit();
+        perf_exit();
 }
diff --git a/linux-user/main.c b/linux-user/main.c
index a17fed0..4290651 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -53,6 +53,7 @@
 #include "signal-common.h"
 #include "loader.h"
 #include "user-mmap.h"
+#include "accel/tcg/perf.h"
 
 #ifdef CONFIG_SEMIHOSTING
 #include "semihosting/semihost.h"
@@ -423,6 +424,16 @@ static void handle_arg_abi_call0(const char *arg)
 }
 #endif
 
+static void handle_arg_perfmap(const char *arg)
+{
+    perf_enable_perfmap();
+}
+
+static void handle_arg_jitdump(const char *arg)
+{
+    perf_enable_jitdump();
+}
+
 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins);
 
 #ifdef CONFIG_PLUGIN
@@ -493,6 +504,10 @@ static const struct qemu_argument arg_table[] = {
     {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0,
      "",           "assume CALL0 Xtensa ABI"},
 #endif
+    {"perfmap",    "QEMU_PERFMAP",     false, handle_arg_perfmap,
+     "",           "Generate a /tmp/perf-${pid}.map file for perf"},
+    {"jitdump",    "QEMU_JITDUMP",     false, handle_arg_jitdump,
+     "",           "Generate a jit-${pid}.dump file for perf"},
     {NULL, NULL, false, NULL, NULL, NULL}
 };
 
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