From 497ad68cd499bf2b6cc3bfde49fdb5aa05934ec4 Mon Sep 17 00:00:00 2001
From: pbrook <pbrook@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Fri, 23 Nov 2007 02:11:10 +0000
Subject: [PATCH] Fix TB chaining for exceptions.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3721 c046a42c-6fe2-441c-8c8c-71466251a162
---
 cpu-exec.c | 52 +++++++++++++++++-----------------------------------
 1 file changed, 17 insertions(+), 35 deletions(-)

diff --git a/cpu-exec.c b/cpu-exec.c
index 1c7356a0df..bab71ee282 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -232,6 +232,11 @@ static inline TranslationBlock *tb_find_fast(void)
     return tb;
 }
 
+#if defined(__sparc__) && !defined(HOST_SOLARIS)
+#define BREAK_CHAIN tmp_T0 = 0
+#else
+#define BREAK_CHAIN T0 = 0
+#endif
 
 /* main execution loop */
 
@@ -405,11 +410,7 @@ int cpu_exec(CPUState *env1)
                         svm_check_intercept(SVM_EXIT_SMI);
                         env->interrupt_request &= ~CPU_INTERRUPT_SMI;
                         do_smm_enter();
-#if defined(__sparc__) && !defined(HOST_SOLARIS)
-                        tmp_T0 = 0;
-#else
-                        T0 = 0;
-#endif
+                        BREAK_CHAIN;
                     } else if ((interrupt_request & CPU_INTERRUPT_HARD) &&
                         (env->eflags & IF_MASK || env->hflags & HF_HIF_MASK) &&
                         !(env->hflags & HF_INHIBIT_IRQ_MASK)) {
@@ -423,11 +424,7 @@ int cpu_exec(CPUState *env1)
                         do_interrupt(intno, 0, 0, 0, 1);
                         /* ensure that no TB jump will be modified as
                            the program flow was changed */
-#if defined(__sparc__) && !defined(HOST_SOLARIS)
-                        tmp_T0 = 0;
-#else
-                        T0 = 0;
-#endif
+                        BREAK_CHAIN;
 #if !defined(CONFIG_USER_ONLY)
                     } else if ((interrupt_request & CPU_INTERRUPT_VIRQ) &&
                         (env->eflags & IF_MASK) && !(env->hflags & HF_INHIBIT_IRQ_MASK)) {
@@ -441,11 +438,7 @@ int cpu_exec(CPUState *env1)
 	                 do_interrupt(intno, 0, 0, -1, 1);
                          stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_ctl),
                                   ldl_phys(env->vm_vmcb + offsetof(struct vmcb, control.int_ctl)) & ~V_IRQ_MASK);
-#if defined(__sparc__) && !defined(HOST_SOLARIS)
-                         tmp_T0 = 0;
-#else
-                         T0 = 0;
-#endif
+                        BREAK_CHAIN;
 #endif
                     }
 #elif defined(TARGET_PPC)
@@ -458,11 +451,7 @@ int cpu_exec(CPUState *env1)
                         ppc_hw_interrupt(env);
                         if (env->pending_interrupts == 0)
                             env->interrupt_request &= ~CPU_INTERRUPT_HARD;
-#if defined(__sparc__) && !defined(HOST_SOLARIS)
-                        tmp_T0 = 0;
-#else
-                        T0 = 0;
-#endif
+                        BREAK_CHAIN;
                     }
 #elif defined(TARGET_MIPS)
                     if ((interrupt_request & CPU_INTERRUPT_HARD) &&
@@ -475,11 +464,7 @@ int cpu_exec(CPUState *env1)
                         env->exception_index = EXCP_EXT_INTERRUPT;
                         env->error_code = 0;
                         do_interrupt(env);
-#if defined(__sparc__) && !defined(HOST_SOLARIS)
-                        tmp_T0 = 0;
-#else
-                        T0 = 0;
-#endif
+                        BREAK_CHAIN;
                     }
 #elif defined(TARGET_SPARC)
                     if ((interrupt_request & CPU_INTERRUPT_HARD) &&
@@ -496,11 +481,7 @@ int cpu_exec(CPUState *env1)
 #if !defined(TARGET_SPARC64) && !defined(CONFIG_USER_ONLY)
                             cpu_check_irqs(env);
 #endif
-#if defined(__sparc__) && !defined(HOST_SOLARIS)
-                            tmp_T0 = 0;
-#else
-                            T0 = 0;
-#endif
+                        BREAK_CHAIN;
 			}
 		    } else if (interrupt_request & CPU_INTERRUPT_TIMER) {
 			//do_interrupt(0, 0, 0, 0, 0);
@@ -511,6 +492,7 @@ int cpu_exec(CPUState *env1)
                         && !(env->uncached_cpsr & CPSR_F)) {
                         env->exception_index = EXCP_FIQ;
                         do_interrupt(env);
+                        BREAK_CHAIN;
                     }
                     /* ARMv7-M interrupt return works by loading a magic value
                        into the PC.  On real hardware the load causes the
@@ -526,17 +508,20 @@ int cpu_exec(CPUState *env1)
                             || !(env->uncached_cpsr & CPSR_I))) {
                         env->exception_index = EXCP_IRQ;
                         do_interrupt(env);
+                        BREAK_CHAIN;
                     }
 #elif defined(TARGET_SH4)
 		    /* XXXXX */
 #elif defined(TARGET_ALPHA)
                     if (interrupt_request & CPU_INTERRUPT_HARD) {
                         do_interrupt(env);
+                        BREAK_CHAIN;
                     }
 #elif defined(TARGET_CRIS)
                     if (interrupt_request & CPU_INTERRUPT_HARD) {
                         do_interrupt(env);
 			env->interrupt_request &= ~CPU_INTERRUPT_HARD;
+                        BREAK_CHAIN;
                     }
 #elif defined(TARGET_M68K)
                     if (interrupt_request & CPU_INTERRUPT_HARD
@@ -549,6 +534,7 @@ int cpu_exec(CPUState *env1)
                            first signalled.  */
                         env->exception_index = env->pending_vector;
                         do_interrupt(1);
+                        BREAK_CHAIN;
                     }
 #endif
                    /* Don't use the cached interupt_request value,
@@ -557,11 +543,7 @@ int cpu_exec(CPUState *env1)
                         env->interrupt_request &= ~CPU_INTERRUPT_EXITTB;
                         /* ensure that no TB jump will be modified as
                            the program flow was changed */
-#if defined(__sparc__) && !defined(HOST_SOLARIS)
-                        tmp_T0 = 0;
-#else
-                        T0 = 0;
-#endif
+                        BREAK_CHAIN;
                     }
                     if (interrupt_request & CPU_INTERRUPT_EXIT) {
                         env->interrupt_request &= ~CPU_INTERRUPT_EXIT;
-- 
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