changed basic block exit generation

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@322 c046a42c-6fe2-441c-8c8c-71466251a162

dyngen-exec.h

@@ -125,6 +125,8 @@ extern int printf(const char *, ...);
 
 #define xglue(x, y) x ## y
 #define glue(x, y) xglue(x, y)
+#define stringify(s)	tostring(s)
+#define tostring(s)	#s
 
 #ifdef __alpha__
 /* the symbols are considered non exported so a br immediate is generated */
@@ -153,3 +155,27 @@ extern int __op_param1, __op_param2, __op_param3;
 #endif
 
 extern int __op_jmp0, __op_jmp1;
+
+#ifdef __i386__
+#define EXIT_TB() asm volatile ("ret")
+#endif
+#ifdef __powerpc__
+#define EXIT_TB() asm volatile ("blr")
+#endif
+#ifdef __s390__
+#define EXIT_TB() asm volatile ("br %r14")
+#endif
+#ifdef __alpha__
+#define EXIT_TB() asm volatile ("ret")
+#endif
+#ifdef __ia64__
+#define EXIT_TB() asm volatile ("br.ret.sptk.many b0;;")
+#endif
+#ifdef __sparc__
+#define EXIT_TB() asm volatile ("jmpl %i0 + 8, %g0\n"
+                                "nop")
+#endif
+#ifdef __arm__
+#define EXIT_TB() asm volatile ("b exec_loop")
+#endif
+

dyngen.c

@@ -1306,38 +1306,10 @@ fprintf(outfile,
 " the_end:\n"
 );
 
-/* generate epilogue */ 
-    switch(ELF_ARCH) {
-    case EM_386:
-        fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
-        break;
-    case EM_PPC:
-        fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x4e800020; /* blr */\n");
-        break;
-    case EM_S390:
-        fprintf(outfile, "*((uint16_t *)gen_code_ptr)++ = 0x07fe; /* br %%r14 */\n");
-        break;
-    case EM_ALPHA:
-        fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x6bfa8001; /* ret */\n");
-        break;
-    case EM_IA_64:
-        fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x00840008; /* br.ret.sptk.many b0;; */\n");
-        break;
-    case EM_SPARC:
-    case EM_SPARC32PLUS:
-	fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c62008; /* jmpl %%i0 + 8, %%g0 */\n");
-	fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x01000000; /* nop */\n");
-        break;
-    case EM_SPARCV9:
-	fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81c7e008; /* ret */\n");
-	fprintf(outfile, "*((uint32_t *)gen_code_ptr)++ = 0x81e80000; /* restore */\n");
-        break;
-    case EM_ARM:
-	fprintf(outfile, "gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 0);\n");
-        break;
-    default:
-	error("unknown ELF architecture");
-    }
+/* generate some code patching */ 
+#ifdef HOST_ARM
+fprintf(outfile, "gen_code_ptr = arm_flush_ldr(gen_code_ptr, arm_ldr_table, arm_ldr_ptr, arm_data_table, arm_data_ptr, 0);\n");
+#endif
     /* flush instruction cache */
     fprintf(outfile, "flush_icache_range((unsigned long)gen_code_buf, (unsigned long)gen_code_ptr);\n");
 

dyngen.h

@@ -152,11 +152,7 @@ static uint8_t *arm_flush_ldr(uint8_t *gen_code_ptr,
  
     data_size = (uint8_t *)data_end - (uint8_t *)data_start;
 
-    if (!gen_jmp) {
-        /* b exec_loop */
-        arm_reloc_pc24((uint32_t *)gen_code_ptr, 0xeafffffe, (long)(&exec_loop)); 
-        gen_code_ptr += 4;
-    } else {
+    if (gen_jmp) {
         /* generate branch to skip the data */
         if (data_size == 0)
             return gen_code_ptr;

exec.h

@@ -225,7 +225,7 @@ label ## n:\
     T0 = (long)(tbparam) + (n);\
     EIP = eip;\
 dummy_label ## n:\
-    return;\
+    EXIT_TB();\
 } while (0)
 
 #endif

op-arm.c

@@ -338,6 +338,11 @@ void OPPROTO op_jmp(void)
     JUMP_TB(PARAM1, 1, PARAM2);
 }
 
+void OPPROTO op_exit_tb(void)
+{
+    EXIT_TB();
+}
+
 void OPPROTO op_movl_T0_psr(void)
 {
     T0 = compute_cpsr();

op-i386.c

@@ -566,6 +566,11 @@ void OPPROTO op_movl_T0_0(void)
     T0 = 0;
 }
 
+void OPPROTO op_exit_tb(void)
+{
+    EXIT_TB();
+}
+
 /* multiple size ops */
 
 #define ldul ldl

translate-arm.c

@@ -828,6 +828,7 @@ static inline int gen_intermediate_code_internal(TranslationBlock *tb, int searc
     case DISAS_JUMP:
         /* indicate that the hash table must be used to find the next TB */
         gen_op_movl_T0_0();
+        gen_op_exit_tb();
         break;
     case DISAS_TB_JUMP:
         /* nothing more to generate */

translate-i386.c

@@ -4163,6 +4163,7 @@ static inline int gen_intermediate_code_internal(TranslationBlock *tb, int searc
     if (dc->is_jmp != DISAS_TB_JUMP) {
         /* indicate that the hash table must be used to find the next TB */
         gen_op_movl_T0_0();
+        gen_op_exit_tb();
     }
     *gen_opc_ptr = INDEX_op_end;
     /* we don't forget to fill the last values */