[PATCH] target/ppc: Fix BookE debug interrupt generation

[Bin Meng]

From: Bin Meng <bin.meng@windriver.com>

Per PowerISA v2.07 [1], Book III-E, chapter 7.6 "Interrupt definitions"

"When in Internal Debug Mode with MSR.DE=0, then Instruction Complete
and Branch Taken debug events cannot occur, and no DBSR status bits
are set and no subsequent imprecise Debug interrupt will occur."

Current codes do not check MSR.DE bit before setting HFLAGS_SE and
HFLAGS_BE flag, which would cause the immediate debug interrupt to
be generated, e.g.: when DBCR0.ICMP bit is set by guest software
and MSR.DE is not set.

[1] https://ibm.ent.box.com/s/jd5w15gz301s5b5dt375mshpq9c3lh4u

Signed-off-by: Bin Meng <bin.meng@windriver.com>
---

 target/ppc/helper_regs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/ppc/helper_regs.c b/target/ppc/helper_regs.c
index 9a691d6833..77bc57415c 100644
--- a/target/ppc/helper_regs.c
+++ b/target/ppc/helper_regs.c
@@ -63,10 +63,10 @@ static uint32_t hreg_compute_hflags_value(CPUPPCState *env)
 
     if (ppc_flags & POWERPC_FLAG_DE) {
         target_ulong dbcr0 = env->spr[SPR_BOOKE_DBCR0];
-        if (dbcr0 & DBCR0_ICMP) {
+        if ((dbcr0 & DBCR0_ICMP) && msr_de) {
             hflags |= 1 << HFLAGS_SE;
         }
-        if (dbcr0 & DBCR0_BRT) {
+        if ((dbcr0 & DBCR0_BRT) && msr_de) {
             hflags |= 1 << HFLAGS_BE;
         }
     } else {
-- 
2.25.1