[PATCH 3/5] target/arm: Suppress debug exceptions when OS Lock set

[Peter Maydell]

The "OS Lock" in the Arm debug architecture is a way for software
to suppress debug exceptions while it is trying to power down
a CPU and save the state of the breakpoint and watchpoint
registers. In QEMU we implemented the support for writing
the OS Lock bit via OSLAR_EL1 and reading it via OSLSR_EL1,
but didn't implement the actual behaviour.

The required behaviour with the OS Lock set is:
 * debug exceptions (apart from BKPT insns) are suppressed
 * some MDSCR_EL1 bits allow write access to the corresponding
   EDSCR external debug status register that they shadow
   (we can ignore this because we don't implement external debug)
 * similarly with the OSECCR_EL1 which shadows the EDECCR
   (but we don't implement OSECCR_EL1 anyway)

Implement the missing behaviour of suppressing debug
exceptions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/debug_helper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/arm/debug_helper.c b/target/arm/debug_helper.c
index 9a78c1db966..691b9b74c4a 100644
--- a/target/arm/debug_helper.c
+++ b/target/arm/debug_helper.c
@@ -142,6 +142,9 @@ static bool aa32_generate_debug_exceptions(CPUARMState *env)
  */
 bool arm_generate_debug_exceptions(CPUARMState *env)
 {
+    if (env->cp15.oslsr_el1 & 1) {
+        return false;
+    }
     if (is_a64(env)) {
         return aa64_generate_debug_exceptions(env);
     } else {
-- 
2.25.1