target/i386: fix INHIBIT_IRQ/TF/RF handling for PAUSE

PAUSE uses DISAS_NORETURN because the corresponding helper
calls cpu_loop_exit().  However, while HLT clear HF_INHIBIT_IRQ_MASK
to correctly handle "STI; HLT", the same is missing from PAUSE.
And also gen_eob() clears HF_RF_MASK and synthesizes a #DB exception
if single-step is active; none of this is done by HLT and PAUSE.
Start fixing PAUSE, HLT will follow.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/target/i386/tcg/misc_helper.c b/target/i386/tcg/misc_helper.c
index 8316d42ffcd0a49da2b5a5f21e5882f0cb30c9d1..ed4cda8001e558433e2948eb3bb67a2a36b3bb3a 100644 (file)
--- a/target/i386/tcg/misc_helper.c
+++ b/target/i386/tcg/misc_helper.c
@@ -92,6 +92,10 @@ G_NORETURN void helper_pause(CPUX86State *env)
 {
     CPUState *cs = env_cpu(env);
 
+    /* Do gen_eob() tasks before going back to the main loop.  */
+    do_end_instruction(env);
+    helper_rechecking_single_step(env);
+
     /* Just let another CPU run.  */
     cs->exception_index = EXCP_INTERRUPT;
     cpu_loop_exit(cs);