tcg: add perfmap and jitdump

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>

softmmu/vl.c

@@ -96,6 +96,9 @@
 #include "fsdev/qemu-fsdev.h"
 #endif
 #include "sysemu/qtest.h"
+#ifdef CONFIG_TCG
+#include "accel/tcg/perf.h"
+#endif
 
 #include "disas/disas.h"
 
@@ -2926,6 +2929,14 @@ void qemu_init(int argc, char **argv)
             case QEMU_OPTION_DFILTER:
                 qemu_set_dfilter_ranges(optarg, &error_fatal);
                 break;
+#if defined(CONFIG_TCG) && defined(CONFIG_LINUX)
+            case QEMU_OPTION_perfmap:
+                perf_enable_perfmap();
+                break;
+            case QEMU_OPTION_jitdump:
+                perf_enable_jitdump();
+                break;
+#endif
             case QEMU_OPTION_seed:
                 qemu_guest_random_seed_main(optarg, &error_fatal);
                 break;