[PULL 14/23] tests/plugin: expand insn test to detect duplicate instructions

["Alex Bennée" <alex.bennee@linaro.org>]

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>

diff --git a/tests/plugin/insn.c b/tests/plugin/insn.c
index a9a6e41237..c253980ec8 100644
--- a/tests/plugin/insn.c
+++ b/tests/plugin/insn.c
@@ -21,6 +21,14 @@ static bool do_inline;
 
 static void vcpu_insn_exec_before(unsigned int cpu_index, void *udata)
 {
+    static uint64_t last_pc;
+    uint64_t this_pc = GPOINTER_TO_UINT(udata);
+    if (this_pc == last_pc) {
+        g_autofree gchar *out = g_strdup_printf("detected repeat execution @ 0x%"
+                                                PRIx64 "\n", this_pc);
+        qemu_plugin_outs(out);
+    }
+    last_pc = this_pc;
     insn_count++;
 }
 
@@ -36,8 +44,10 @@ static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
             qemu_plugin_register_vcpu_insn_exec_inline(
                 insn, QEMU_PLUGIN_INLINE_ADD_U64, &insn_count, 1);
         } else {
+            uint64_t vaddr = qemu_plugin_insn_vaddr(insn);
             qemu_plugin_register_vcpu_insn_exec_cb(
-                insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS, NULL);
+                insn, vcpu_insn_exec_before, QEMU_PLUGIN_CB_NO_REGS,
+                GUINT_TO_POINTER(vaddr));
         }
     }
 }
diff --git a/tests/tcg/i386/Makefile.softmmu-target b/tests/tcg/i386/Makefile.softmmu-target
index 5266f2335a..fa9b1b9f90 100644
--- a/tests/tcg/i386/Makefile.softmmu-target
+++ b/tests/tcg/i386/Makefile.softmmu-target
@@ -33,5 +33,15 @@ EXTRA_RUNS+=$(MULTIARCH_RUNS)
 
 memory: CFLAGS+=-DCHECK_UNALIGNED=1
 
+# non-inline runs will trigger the duplicate instruction heuristics in libinsn.so
+run-plugin-%-with-libinsn.so:
+	$(call run-test, $@, \
+	  $(QEMU) -monitor none -display none \
+		  -chardev file$(COMMA)path=$@.out$(COMMA)id=output \
+                  -plugin ../../plugin/libinsn.so$(COMMA)arg=inline \
+	    	  -d plugin -D $*-with-libinsn.so.pout \
+	   	  $(QEMU_OPTS) $*, \
+		  "$* on $(TARGET_NAME)")
+
 # Running
 QEMU_OPTS+=-device isa-debugcon,chardev=output -device isa-debug-exit,iobase=0xf4,iosize=0x4 -kernel
diff --git a/tests/tcg/i386/Makefile.target b/tests/tcg/i386/Makefile.target
index ad187cb2c9..c4a6f91966 100644
--- a/tests/tcg/i386/Makefile.target
+++ b/tests/tcg/i386/Makefile.target
@@ -48,6 +48,13 @@ else
 SKIP_I386_TESTS+=test-i386-fprem
 endif
 
+# non-inline runs will trigger the duplicate instruction heuristics in libinsn.so
+run-plugin-%-with-libinsn.so:
+	$(call run-test, $@, $(QEMU) $(QEMU_OPTS) \
+	       -plugin ../../plugin/libinsn.so$(COMMA)arg=inline \
+	       -d plugin -D $*-with-libinsn.so.pout $*, \
+		"$* (inline) on $(TARGET_NAME)")
+
 # Update TESTS
 I386_TESTS:=$(filter-out $(SKIP_I386_TESTS), $(ALL_X86_TESTS))
 TESTS=$(MULTIARCH_TESTS) $(I386_TESTS)
diff --git a/tests/tcg/x86_64/Makefile.softmmu-target b/tests/tcg/x86_64/Makefile.softmmu-target
index 1bd763f2e6..9896319f0e 100644
--- a/tests/tcg/x86_64/Makefile.softmmu-target
+++ b/tests/tcg/x86_64/Makefile.softmmu-target
@@ -33,5 +33,15 @@ EXTRA_RUNS+=$(MULTIARCH_RUNS)
 
 memory: CFLAGS+=-DCHECK_UNALIGNED=1
 
+# non-inline runs will trigger the duplicate instruction heuristics in libinsn.so
+run-plugin-%-with-libinsn.so:
+	$(call run-test, $@, \
+	  $(QEMU) -monitor none -display none \
+		  -chardev file$(COMMA)path=$@.out$(COMMA)id=output \
+                  -plugin ../../plugin/libinsn.so$(COMMA)arg=inline \
+	    	  -d plugin -D $*-with-libinsn.so.pout \
+	   	  $(QEMU_OPTS) $*, \
+		  "$* on $(TARGET_NAME)")
+
 # Running
 QEMU_OPTS+=-device isa-debugcon,chardev=output -device isa-debug-exit,iobase=0xf4,iosize=0x4 -kernel
-- 
2.20.1