target-alpha: Fix load-locked/store-conditional.

Use an exception plus start_exclusive to implement the compare-and-swap.
This follows the example set by the MIPS and PPC ports.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/target-alpha/op_helper.c b/target-alpha/op_helper.c
index a20913033d..bfc095cc8a 100644
--- a/target-alpha/op_helper.c
+++ b/target-alpha/op_helper.c
@@ -1159,6 +1159,7 @@ void helper_hw_rei (void)
     env->pc = env->ipr[IPR_EXC_ADDR] & ~3;
     env->ipr[IPR_EXC_ADDR] = env->ipr[IPR_EXC_ADDR] & 1;
     env->intr_flag = 0;
+    env->lock_addr = -1;
     /* XXX: re-enable interrupts and memory mapping */
 }
 
@@ -1167,6 +1168,7 @@ void helper_hw_ret (uint64_t a)
     env->pc = a & ~3;
     env->ipr[IPR_EXC_ADDR] = a & 1;
     env->intr_flag = 0;
+    env->lock_addr = -1;
     /* XXX: re-enable interrupts and memory mapping */
 }