[PATCH v6 2/3] target/riscv: Apply modularized matching conditions for watchpoint

[alvinga]

From: Alvin Chang via <qemu-devel@nongnu.org>

We have implemented trigger_common_match(), which checks if the enabled
privilege levels of the trigger match CPU's current privilege level.
Remove the related code in riscv_cpu_debug_check_watchpoint() and invoke
trigger_common_match() to check the privilege levels of the type 2 and
type 6 triggers for the watchpoints.

This commit also changes the behavior of looping the triggers. In
previous implementation, if we have a type 2 trigger and
env->virt_enabled is true, we directly return false to stop the loop.
Now we keep looping all the triggers until we find a matched trigger.

Only load/store bits and loaded/stored address should be further checked
in riscv_cpu_debug_check_watchpoint().

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
---
 target/riscv/debug.c | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/target/riscv/debug.c b/target/riscv/debug.c
index 11125f33..c290d600 100644
--- a/target/riscv/debug.c
+++ b/target/riscv/debug.c
@@ -901,13 +901,12 @@ bool riscv_cpu_debug_check_watchpoint(CPUState *cs, 
CPUWatchpoint *wp)
     for (i = 0; i < RV_MAX_TRIGGERS; i++) {
         trigger_type = get_trigger_type(env, i);
 
+        if (!trigger_common_match(env, trigger_type, i)) {
+            continue;
+        }
+
         switch (trigger_type) {
         case TRIGGER_TYPE_AD_MATCH:
-            /* type 2 trigger cannot be fired in VU/VS mode */
-            if (env->virt_enabled) {
-                return false;
-            }
-
             ctrl = env->tdata1[i];
             addr = env->tdata2[i];
             flags = 0;
@@ -920,10 +919,7 @@ bool riscv_cpu_debug_check_watchpoint(CPUState *cs, 
CPUWatchpoint *wp)
             }
 
             if ((wp->flags & flags) && (wp->vaddr == addr)) {
-                /* check U/S/M bit against current privilege level */
-                if ((ctrl >> 3) & BIT(env->priv)) {
-                    return true;
-                }
+                return true;
             }
             break;
         case TRIGGER_TYPE_AD_MATCH6:
@@ -939,17 +935,7 @@ bool riscv_cpu_debug_check_watchpoint(CPUState *cs, 
CPUWatchpoint *wp)
             }
 
             if ((wp->flags & flags) && (wp->vaddr == addr)) {
-                if (env->virt_enabled) {
-                    /* check VU/VS bit against current privilege level */
-                    if ((ctrl >> 23) & BIT(env->priv)) {
-                        return true;
-                    }
-                } else {
-                    /* check U/S/M bit against current privilege level */
-                    if ((ctrl >> 3) & BIT(env->priv)) {
-                        return true;
-                    }
-                }
+                return true;
             }
             break;
         default:
-- 
2.34.1