[Qemu-devel] [4389] CRIS: Concistent use of btarget and make it possible to single-step over delayslots .

[Edgar E. Iglesias]

Revision: 4389
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=4389
Author:   edgar_igl
Date:     2008-05-09 08:14:05 +0000 (Fri, 09 May 2008)

Log Message:
-----------
CRIS: Concistent use of btarget and make it possible to single-step over 
delayslots.

Modified Paths:
--------------
    trunk/target-cris/translate.c

Modified: trunk/target-cris/translate.c
===================================================================
--- trunk/target-cris/translate.c       2008-05-09 05:55:18 UTC (rev 4388)
+++ trunk/target-cris/translate.c       2008-05-09 08:14:05 UTC (rev 4389)
@@ -2509,7 +2509,7 @@
        cris_cc_mask(dc, 0);
        /* Store the return address in Pd.  */
        tcg_gen_movi_tl(cpu_T[0], imm);
-       t_gen_mov_env_TN(btarget, cpu_T[0]);
+       tcg_gen_mov_tl(env_btarget, cpu_T[0]);
        tcg_gen_movi_tl(cpu_T[0], dc->pc + 8 + 4);
        t_gen_mov_preg_TN(dc->op2, cpu_T[0]);
        cris_prepare_dyn_jmp(dc);
@@ -2522,7 +2522,7 @@
        cris_cc_mask(dc, 0);
        /* Store the return address in Pd.  */
        t_gen_mov_TN_reg(cpu_T[0], dc->op1);
-       t_gen_mov_env_TN(btarget, cpu_T[0]);
+       tcg_gen_mov_tl(env_btarget, cpu_T[0]);
        tcg_gen_movi_tl(cpu_T[0], dc->pc + 4 + 4);
        t_gen_mov_preg_TN(dc->op2, cpu_T[0]);
        cris_prepare_dyn_jmp(dc);
@@ -2557,7 +2557,7 @@
        cris_cc_mask(dc, 0);
        /* Stor the return address in Pd.  */
        tcg_gen_movi_tl(cpu_T[0], dc->pc + simm);
-       t_gen_mov_env_TN(btarget, cpu_T[0]);
+       tcg_gen_mov_tl(env_btarget, cpu_T[0]);
        tcg_gen_movi_tl(cpu_T[0], dc->pc + 8);
        t_gen_mov_preg_TN(dc->op2, cpu_T[0]);
        cris_prepare_dyn_jmp(dc);
@@ -2573,7 +2573,7 @@
        cris_cc_mask(dc, 0);
        /* Stor the return address in Pd.  */
        tcg_gen_movi_tl(cpu_T[0], dc->pc + simm);
-       t_gen_mov_env_TN(btarget, cpu_T[0]);
+       tcg_gen_mov_tl(env_btarget, cpu_T[0]);
        tcg_gen_movi_tl(cpu_T[0], dc->pc + 12);
        t_gen_mov_preg_TN(dc->op2, cpu_T[0]);
        cris_prepare_dyn_jmp(dc);
@@ -2813,10 +2813,12 @@
        if (!logfile)
                logfile = stderr;
 
-       if (tb->pc & 1)
-               cpu_abort(env, "unaligned pc=%x erp=%x\n",
-                         env->pc, env->pregs[PR_ERP]);
-       pc_start = tb->pc;
+       /* Odd PC indicates that branch is rexecuting due to exception in the
+        * delayslot, like in real hw.
+        * FIXME: we need to handle the case were the branch and the insn in
+        *         the delayslot do not share pages.
+        */
+       pc_start = tb->pc & ~1;
        dc->env = env;
        dc->tb = tb;
 
@@ -2905,14 +2907,16 @@
                        }
                }
 
-               if (env->singlestep_enabled)
+               /* If we are rexecuting a branch due to exceptions on
+                  delay slots dont break.  */
+               if (!(tb->pc & 1) && env->singlestep_enabled)
                        break;
        } while (!dc->is_jmp && gen_opc_ptr < gen_opc_end
                 && ((dc->pc < next_page_start) || dc->delayed_branch));
 
        if (dc->delayed_branch == 1) {
                /* Reexecute the last insn.  */
-               dc->pc = dc->ppc;
+               dc->pc = dc->ppc | 1;
        }
 
        if (!dc->is_jmp) {