[PULL 23/41] target/ppc: 405: Debug exception cleanup

["Cédric Le Goater" <clg@kaod.org>]

From: Fabiano Rosas <farosas@linux.ibm.com>

The current Debug exception dispatch is the BookE one, so it is
different from the 405. We effectively don't support the 405 Debug
exception.

This patch removes the BookE code and moves the DEBUG into the "not
implemented" block.

Note that there is in theory a functional change here since we now
abort when a Debug exception happens. However, given how it was never
implemented, I don't believe this to have ever been dispatched for the
405.

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20220118184448.852996-11-farosas@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/excp_helper.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index 55f6b0e98100..89fc40bb7366 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -539,23 +539,13 @@ static void powerpc_excp_40x(PowerPCCPU *cpu, int excp)
     case POWERPC_EXCP_DTLB:      /* Data TLB error                           */
     case POWERPC_EXCP_ITLB:      /* Instruction TLB error                    */
         break;
-    case POWERPC_EXCP_DEBUG:     /* Debug interrupt                          */
-        if (env->flags & POWERPC_FLAG_DE) {
-            /* FIXME: choose one or the other based on CPU type */
-            srr0 = SPR_BOOKE_DSRR0;
-            srr1 = SPR_BOOKE_DSRR1;
-
-            env->spr[SPR_BOOKE_CSRR0] = env->nip;
-            env->spr[SPR_BOOKE_CSRR1] = msr;
-
-            /* DBSR already modified by caller */
-        } else {
-            cpu_abort(cs, "Debug exception triggered on unsupported model\n");
-        }
-        break;
     case POWERPC_EXCP_PIT:       /* Programmable interval timer interrupt    */
         trace_ppc_excp_print("PIT");
         break;
+    case POWERPC_EXCP_DEBUG:     /* Debug interrupt                          */
+        cpu_abort(cs, "%s exception not implemented\n",
+                  powerpc_excp_name(excp));
+        break;
     default:
         cpu_abort(cs, "Invalid PowerPC exception %d. Aborting\n", excp);
         break;
-- 
2.34.1