tcg: let plugins instrument virtual memory accesses

To capture all memory accesses we need hook into all the various
helper functions that are involved in memory operations as well as the
injected inline helper calls. A later commit will allow us to resolve
the actual guest HW addresses by replaying the lookup.

Signed-off-by: Emilio G. Cota <cota@braap.org>
[AJB: drop haddr handling, just deal in vaddr]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 34 insertions, 27 deletions

diff --git a/include/exec/cpu-defs.h b/include/exec/cpu-defs.h
index be946ba..8c44abe 100644
--- a/include/exec/cpu-defs.h
+++ b/include/exec/cpu-defs.h
@@ -214,6 +214,7 @@ typedef struct CPUTLBCommon {
  * Since this is placed within CPUNegativeOffsetState, the smallest
  * negative offsets are at the end of the struct.
  */
+
 typedef struct CPUTLB {
     CPUTLBCommon c;
     CPUTLBDesc d[NB_MMU_MODES];
diff --git a/include/exec/cpu_ldst_template.h b/include/exec/cpu_ldst_template.h
index 5750a26..6f0d340 100644
--- a/include/exec/cpu_ldst_template.h
+++ b/include/exec/cpu_ldst_template.h
@@ -28,6 +28,7 @@
 #include "trace-root.h"
 #endif
 
+#include "qemu/plugin.h"
 #include "trace/mem.h"
 
 #if DATA_SIZE == 8
@@ -86,11 +87,9 @@ glue(glue(glue(cpu_ld, USUFFIX), MEMSUFFIX), _ra)(CPUArchState *env,
     target_ulong addr;
     int mmu_idx = CPU_MMU_INDEX;
     TCGMemOpIdx oi;
-
 #if !defined(SOFTMMU_CODE_ACCESS)
-    trace_guest_mem_before_exec(
-        env_cpu(env), ptr,
-        trace_mem_build_info(SHIFT, false, MO_TE, false, mmu_idx));
+    uint16_t meminfo = trace_mem_build_info(SHIFT, false, MO_TE, false, mmu_idx);
+    trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
 #endif
 
     addr = ptr;
@@ -104,6 +103,9 @@ glue(glue(glue(cpu_ld, USUFFIX), MEMSUFFIX), _ra)(CPUArchState *env,
         uintptr_t hostaddr = addr + entry->addend;
         res = glue(glue(ld, USUFFIX), _p)((uint8_t *)hostaddr);
     }
+#ifndef SOFTMMU_CODE_ACCESS
+    qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, meminfo);
+#endif
     return res;
 }
 
@@ -124,11 +126,9 @@ glue(glue(glue(cpu_lds, SUFFIX), MEMSUFFIX), _ra)(CPUArchState *env,
     target_ulong addr;
     int mmu_idx = CPU_MMU_INDEX;
     TCGMemOpIdx oi;
-
 #if !defined(SOFTMMU_CODE_ACCESS)
-    trace_guest_mem_before_exec(
-        env_cpu(env), ptr,
-        trace_mem_build_info(SHIFT, true, MO_TE, false, mmu_idx));
+    uint16_t meminfo = trace_mem_build_info(SHIFT, true, MO_TE, false, mmu_idx);
+    trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
 #endif
 
     addr = ptr;
@@ -142,6 +142,9 @@ glue(glue(glue(cpu_lds, SUFFIX), MEMSUFFIX), _ra)(CPUArchState *env,
         uintptr_t hostaddr = addr + entry->addend;
         res = glue(glue(lds, SUFFIX), _p)((uint8_t *)hostaddr);
     }
+#ifndef SOFTMMU_CODE_ACCESS
+    qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, meminfo);
+#endif
     return res;
 }
 
@@ -165,11 +168,9 @@ glue(glue(glue(cpu_st, SUFFIX), MEMSUFFIX), _ra)(CPUArchState *env,
     target_ulong addr;
     int mmu_idx = CPU_MMU_INDEX;
     TCGMemOpIdx oi;
-
 #if !defined(SOFTMMU_CODE_ACCESS)
-    trace_guest_mem_before_exec(
-        env_cpu(env), ptr,
-        trace_mem_build_info(SHIFT, false, MO_TE, true, mmu_idx));
+    uint16_t meminfo = trace_mem_build_info(SHIFT, false, MO_TE, true, mmu_idx);
+    trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
 #endif
 
     addr = ptr;
@@ -183,6 +184,9 @@ glue(glue(glue(cpu_st, SUFFIX), MEMSUFFIX), _ra)(CPUArchState *env,
         uintptr_t hostaddr = addr + entry->addend;
         glue(glue(st, SUFFIX), _p)((uint8_t *)hostaddr, v);
     }
+#ifndef SOFTMMU_CODE_ACCESS
+    qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, meminfo);
+#endif
 }
 
 static inline void
diff --git a/include/exec/cpu_ldst_useronly_template.h b/include/exec/cpu_ldst_useronly_template.h
index 93ad532..dbdc7a8 100644
--- a/include/exec/cpu_ldst_useronly_template.h
+++ b/include/exec/cpu_ldst_useronly_template.h
@@ -64,18 +64,18 @@
 static inline RES_TYPE
 glue(glue(cpu_ld, USUFFIX), MEMSUFFIX)(CPUArchState *env, abi_ptr ptr)
 {
-#ifdef CODE_ACCESS
     RES_TYPE ret;
+#ifdef CODE_ACCESS
     set_helper_retaddr(1);
     ret = glue(glue(ld, USUFFIX), _p)(g2h(ptr));
     clear_helper_retaddr();
-    return ret;
 #else
-    trace_guest_mem_before_exec(
-        env_cpu(env), ptr,
-        trace_mem_build_info(SHIFT, false, MO_TE, false, MMU_USER_IDX));
-    return glue(glue(ld, USUFFIX), _p)(g2h(ptr));
+    uint16_t meminfo = trace_mem_build_info(SHIFT, false, MO_TE, false,
+                                            MMU_USER_IDX);
+    trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
+    ret = glue(glue(ld, USUFFIX), _p)(g2h(ptr));
 #endif
+    return ret;
 }
 
 #ifndef CODE_ACCESS
@@ -96,18 +96,19 @@ glue(glue(glue(cpu_ld, USUFFIX), MEMSUFFIX), _ra)(CPUArchState *env,
 static inline int
 glue(glue(cpu_lds, SUFFIX), MEMSUFFIX)(CPUArchState *env, abi_ptr ptr)
 {
-#ifdef CODE_ACCESS
     int ret;
+#ifdef CODE_ACCESS
     set_helper_retaddr(1);
     ret = glue(glue(lds, SUFFIX), _p)(g2h(ptr));
     clear_helper_retaddr();
-    return ret;
 #else
-    trace_guest_mem_before_exec(
-        env_cpu(env), ptr,
-        trace_mem_build_info(SHIFT, true, MO_TE, false, MMU_USER_IDX));
-    return glue(glue(lds, SUFFIX), _p)(g2h(ptr));
+    uint16_t meminfo = trace_mem_build_info(SHIFT, true, MO_TE, false,
+                                            MMU_USER_IDX);
+    trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
+    ret = glue(glue(lds, SUFFIX), _p)(g2h(ptr));
+    qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, meminfo);
 #endif
+    return ret;
 }
 
 #ifndef CODE_ACCESS
@@ -130,10 +131,11 @@ static inline void
 glue(glue(cpu_st, SUFFIX), MEMSUFFIX)(CPUArchState *env, abi_ptr ptr,
                                       RES_TYPE v)
 {
-    trace_guest_mem_before_exec(
-        env_cpu(env), ptr,
-        trace_mem_build_info(SHIFT, false, MO_TE, true, MMU_USER_IDX));
+    uint16_t meminfo = trace_mem_build_info(SHIFT, false, MO_TE, true,
+                                            MMU_USER_IDX);
+    trace_guest_mem_before_exec(env_cpu(env), ptr, meminfo);
     glue(glue(st, SUFFIX), _p)(g2h(ptr), v);
+    qemu_plugin_vcpu_mem_cb(env_cpu(env), ptr, meminfo);
 }
 
 static inline void