[PATCH v2 6/7] tests/plugin/mem: add option to print memory accesses

[Pierrick Bouvier <pierrick.bouvier@linaro.org>]

By using "print-accesses=true" option, mem plugin will now print every
value accessed, with associated size, type (store vs load) and symbol
where this happens.

Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 tests/plugin/mem.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/tests/plugin/mem.c b/tests/plugin/mem.c
index b650dddcce1..d897034a044 100644
--- a/tests/plugin/mem.c
+++ b/tests/plugin/mem.c
@@ -24,7 +24,7 @@ typedef struct {
 static struct qemu_plugin_scoreboard *counts;
 static qemu_plugin_u64 mem_count;
 static qemu_plugin_u64 io_count;
-static bool do_inline, do_callback;
+static bool do_inline, do_callback, do_print_accesses;
 static bool do_haddr;
 static enum qemu_plugin_mem_rw rw = QEMU_PLUGIN_MEM_RW;
 
@@ -60,6 +60,20 @@ static void vcpu_mem(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
     }
 }
 
+static void print_access(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
+                         uint64_t vaddr, void *udata)
+{
+    unsigned size = 8 << qemu_plugin_mem_size_shift(meminfo);
+    const char *type = qemu_plugin_mem_is_store(meminfo) ? "store" : "load";
+    uint64_t upper = qemu_plugin_mem_get_value_upper_bits(meminfo);
+    uint64_t lower = qemu_plugin_mem_get_value_lower_bits(meminfo);
+    const char *sym = udata ? udata : "";
+    g_autoptr(GString) out = g_string_new("");
+    g_string_printf(out, "access: 0x%.0"PRIx64"%"PRIx64",%d,%s,%s\n",
+                    upper, lower, size, type, sym);
+    qemu_plugin_outs(out->str);
+}
+
 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
 {
     size_t n = qemu_plugin_tb_n_insns(tb);
@@ -79,6 +93,12 @@ static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
                                              QEMU_PLUGIN_CB_NO_REGS,
                                              rw, NULL);
         }
+        if (do_print_accesses) {
+            const char *sym = qemu_plugin_insn_symbol(insn);
+            qemu_plugin_register_vcpu_mem_cb(insn, print_access,
+                                             QEMU_PLUGIN_CB_NO_REGS,
+                                             rw, (void *) sym);
+        }
     }
 }
 
@@ -117,6 +137,12 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
                 fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
                 return -1;
             }
+        } else if (g_strcmp0(tokens[0], "print-accesses") == 0) {
+            if (!qemu_plugin_bool_parse(tokens[0], tokens[1],
+                                        &do_print_accesses)) {
+                fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
+                return -1;
+            }
         } else {
             fprintf(stderr, "option parsing failed: %s\n", opt);
             return -1;
-- 
2.39.2