commit 8dd4983c4e0c4e4f2ed87060a770ba99e03f3b9e
author bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> Sat Jun 04 22:22:27 2005 +0000
committer bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162> Sat Jun 04 22:22:27 2005 +0000
tree 0058cba4fd8aaa7a16af9c11270f8d1b2b3f3fc5
parent 71be0fc3eb3f8ac523e1b1b2ae138a5c9a613dee

fixed lsw[ix] / stsw[ix] potential exception bug - mtcrf workaround for Mac OS X 10.4 - use direct jump at page boundary


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1441 c046a42c-6fe2-441c-8c8c-71466251a162

target-ppc/translate.c

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index cf47f2b..2a828ed 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -1370,6 +1370,8 @@
         gen_op_load_gpr_T0(ra);
     }
     gen_op_set_T1(nb);
+    /* NIP cannot be restored if the memory exception comes from an helper */
+    gen_op_update_nip((ctx)->nip - 4); 
     op_ldsts(lswi, start);
 }
 
@@ -1388,6 +1390,8 @@
         gen_op_add();
     }
     gen_op_load_xer_bc();
+    /* NIP cannot be restored if the memory exception comes from an helper */
+    gen_op_update_nip((ctx)->nip - 4); 
     op_ldstsx(lswx, rD(ctx->opcode), ra, rb);
 }
 
@@ -1404,6 +1408,8 @@
     if (nb == 0)
         nb = 32;
     gen_op_set_T1(nb);
+    /* NIP cannot be restored if the memory exception comes from an helper */
+    gen_op_update_nip((ctx)->nip - 4); 
     op_ldsts(stsw, rS(ctx->opcode));
 }
 
@@ -1421,6 +1427,8 @@
         gen_op_add();
     }
     gen_op_load_xer_bc();
+    /* NIP cannot be restored if the memory exception comes from an helper */
+    gen_op_update_nip((ctx)->nip - 4); 
     op_ldsts(stsw, rS(ctx->opcode));
 }
 
@@ -2123,7 +2131,8 @@
 }
 
 /* mtcrf */
-GEN_HANDLER(mtcrf, 0x1F, 0x10, 0x04, 0x00100801, PPC_MISC)
+/* The mask should be 0x00100801, but Mac OS X 10.4 use an alternate form */
+GEN_HANDLER(mtcrf, 0x1F, 0x10, 0x04, 0x00000801, PPC_MISC)
 {
     gen_op_load_gpr_T0(rS(ctx->opcode));
     gen_op_store_cr(CRM(ctx->opcode));
@@ -3312,10 +3321,14 @@
              ctx.exception != EXCP_TRAP)) {
             RET_EXCP(ctxp, EXCP_TRACE, 0);
         }
+        if (ctx.exception != EXCP_NONE)
+            break;
         /* if we reach a page boundary, stop generation */
         if ((ctx.nip & (TARGET_PAGE_SIZE - 1)) == 0) {
-            RET_EXCP(ctxp, EXCP_BRANCH, 0);
-    }
+            gen_op_b((long)ctx.tb, ctx.nip);
+            ctx.exception = EXCP_BRANCH;
+            break;
+        }
     }
     if (ctx.exception == EXCP_NONE) {
         gen_op_b((unsigned long)ctx.tb, ctx.nip);