ARMv7 support.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3572 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 12 insertions, 1 deletions

diff --git a/cpu-exec.c b/cpu-exec.c
index 4ba63fba31..aa58cbb24a 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -173,6 +173,7 @@ static inline TranslationBlock *tb_find_fast(void)
         flags |= (1 << 6);
     if (env->vfp.xregs[ARM_VFP_FPEXC] & (1 << 30))
         flags |= (1 << 7);
+    flags |= (env->condexec_bits << 8);
     cs_base = 0;
     pc = env->regs[15];
 #elif defined(TARGET_SPARC)
@@ -511,8 +512,18 @@ int cpu_exec(CPUState *env1)
                         env->exception_index = EXCP_FIQ;
                         do_interrupt(env);
                     }
+                    /* ARMv7-M interrupt return works by loading a magic value
+                       into the PC.  On real hardware the load causes the
+                       return to occur.  The qemu implementation performs the
+                       jump normally, then does the exception return when the
+                       CPU tries to execute code at the magic address.
+                       This will cause the magic PC value to be pushed to
+                       the stack if an interrupt occured at the wrong time.
+                       We avoid this by disabling interrupts when
+                       pc contains a magic address.  */
                     if (interrupt_request & CPU_INTERRUPT_HARD
-                        && !(env->uncached_cpsr & CPSR_I)) {
+                        && ((IS_M(env) && env->regs[15] < 0xfffffff0)
+                            || !(env->uncached_cpsr & CPSR_I))) {
                         env->exception_index = EXCP_IRQ;
                         do_interrupt(env);
                     }