softmmu: Check watchpoints for read+write at once

Atomic operations are read-modify-write, and we'd like to
be able to test both read and write with one call.  This is
easy enough, with BP_MEM_READ | BP_MEM_WRITE.

Add BP_HIT_SHIFT to make it easy to set BP_WATCHPOINT_HIT_*.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h
index fb5d9667ca27fd91d24eb37874a4584ab828c9d9..75689bff0231b94902a0534bd9f4b1e7c8210565 100644 (file)
--- a/include/hw/core/cpu.h
+++ b/include/hw/core/cpu.h
@@ -923,9 +923,10 @@ void cpu_single_step(CPUState *cpu, int enabled);
 #define BP_GDB                0x10
 #define BP_CPU                0x20
 #define BP_ANY                (BP_GDB | BP_CPU)
-#define BP_WATCHPOINT_HIT_READ 0x40
-#define BP_WATCHPOINT_HIT_WRITE 0x80
-#define BP_WATCHPOINT_HIT (BP_WATCHPOINT_HIT_READ | BP_WATCHPOINT_HIT_WRITE)
+#define BP_HIT_SHIFT          6
+#define BP_WATCHPOINT_HIT_READ  (BP_MEM_READ << BP_HIT_SHIFT)
+#define BP_WATCHPOINT_HIT_WRITE (BP_MEM_WRITE << BP_HIT_SHIFT)
+#define BP_WATCHPOINT_HIT       (BP_MEM_ACCESS << BP_HIT_SHIFT)
 
 int cpu_breakpoint_insert(CPUState *cpu, vaddr pc, int flags,
                           CPUBreakpoint **breakpoint);

diff --git a/softmmu/watchpoint.c b/softmmu/watchpoint.c
index 279129dd1cdd5427e934abb3d64a1a6d34dcdb6c..ad58736787e353743549ba949da919da1cb0eba4 100644 (file)
--- a/softmmu/watchpoint.c
+++ b/softmmu/watchpoint.c
@@ -162,9 +162,12 @@ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
         /* this is currently used only by ARM BE32 */
         addr = cc->tcg_ops->adjust_watchpoint_address(cpu, addr, len);
     }
+
+    assert((flags & ~BP_MEM_ACCESS) == 0);
     QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
-        if (watchpoint_address_matches(wp, addr, len)
-            && (wp->flags & flags)) {
+        int hit_flags = wp->flags & flags;
+
+        if (hit_flags && watchpoint_address_matches(wp, addr, len)) {
             if (replay_running_debug()) {
                 /*
                  * replay_breakpoint reads icount.
@@ -184,16 +187,14 @@ void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
                 replay_breakpoint();
                 return;
             }
-            if (flags == BP_MEM_READ) {
-                wp->flags |= BP_WATCHPOINT_HIT_READ;
-            } else {
-                wp->flags |= BP_WATCHPOINT_HIT_WRITE;
-            }
+
+            wp->flags |= hit_flags << BP_HIT_SHIFT;
             wp->hitaddr = MAX(addr, wp->vaddr);
             wp->hitattrs = attrs;
 
-            if (wp->flags & BP_CPU && cc->tcg_ops->debug_check_watchpoint &&
-                !cc->tcg_ops->debug_check_watchpoint(cpu, wp)) {
+            if (wp->flags & BP_CPU
+                && cc->tcg_ops->debug_check_watchpoint
+                && !cc->tcg_ops->debug_check_watchpoint(cpu, wp)) {
                 wp->flags &= ~BP_WATCHPOINT_HIT;
                 continue;
             }