[Qemu-devel] [PATCH 11/24] target-alpha: Merge HW_REI and HW_RET implementations.

[Richard Henderson <rth@twiddle.net>]

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-alpha/translate.c |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index 7c90ad9..c8ef31d 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -2939,14 +2939,24 @@ static ExitStatus translate_one(DisasContext *ctx, uint32_t insn)
         break;
 #endif
     case 0x1E:
-        /* HW_REI (PALcode) */
+        /* HW_RET (PALcode) */
 #if defined (CONFIG_USER_ONLY)
         goto invalid_opc;
 #else
         if (!ctx->pal_mode)
             goto invalid_opc;
-        gen_helper_hw_ret(cpu_ir[rb]);
-        break;
+        if (rb == 31) {
+            /* Pre-EV6 CPUs interpreted this as HW_REI, loading the return
+               address from EXC_ADDR.  This turns out to be useful for our
+               emulation PALcode, so continue to accept it.  */
+            TCGv tmp = tcg_temp_new();
+            tcg_gen_ld_i64(tmp, cpu_env, offsetof(CPUState, exc_addr));
+            gen_helper_hw_ret(tmp);
+            tcg_temp_free(tmp);
+        } else {
+            gen_helper_hw_ret(cpu_ir[rb]);
+        }
+        return EXIT_PC_UPDATED;
 #endif
     case 0x1F:
         /* HW_ST (PALcode) */
-- 
1.7.3.4