From: Daniel Henrique Barboza <dbarboza@ventanamicro.com>

The mcontrol select bit (19) is always zero, meaning our triggers will
always match virtual addresses. In this condition, if the user does not
specify a size for the trigger, the access size defaults to XLEN.

At this moment we're using def_size = 8 regardless of CPU XLEN. Use
def_size = 4 in case we're running 32 bits.

Fixes: 95799e36c1 ("target/riscv: Add initial support for the Sdtrig extension")
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250121170626.1992570-2-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
(cherry picked from commit 3fba76e61caa46329afc399b3ecaaba70c8b0a4e)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/target/riscv/debug.c b/target/riscv/debug.c
index 4945d1a1f2..49de0e4ea9 100644
--- a/target/riscv/debug.c
+++ b/target/riscv/debug.c
@@ -305,7 +305,7 @@ static void type2_breakpoint_insert(CPURISCVState *env, target_ulong index)
     bool enabled = type2_breakpoint_enabled(ctrl);
     CPUState *cs = env_cpu(env);
     int flags = BP_CPU | BP_STOP_BEFORE_ACCESS;
-    uint32_t size;
+    uint32_t size, def_size;
 
     if (!enabled) {
         return;
@@ -328,7 +328,9 @@ static void type2_breakpoint_insert(CPURISCVState *env, target_ulong index)
             cpu_watchpoint_insert(cs, addr, size, flags,
                                   &env->cpu_watchpoint[index]);
         } else {
-            cpu_watchpoint_insert(cs, addr, 8, flags,
+            def_size = riscv_cpu_mxl(env) == MXL_RV64 ? 8 : 4;
+
+            cpu_watchpoint_insert(cs, addr, def_size, flags,
                                   &env->cpu_watchpoint[index]);
         }
     }
-- 
2.39.5