[17/18] target/arm: Add cur_el parameter to arm_generate_debug_exceptions

Commit Message

Richard Henderson May 23, 2022, 8:47 p.m. UTC

We often have this value already handy in the caller.

Signed-off-by: Richard Henderson <[e-mail]>
---
 target/arm/internals.h    |  2 +-
 target/arm/debug_helper.c | 11 +++++------
 target/arm/helper-a64.c   |  2 +-
 3 files changed, 7 insertions(+), 8 deletions(-)

Comments

Peter Maydell May 31, 2022, 12:07 p.m. UTC | #1

On Mon, 23 May 2022 at 22:07, Richard Henderson
<[e-mail]> wrote:
>
> We often have this value already handy in the caller.
>
> Signed-off-by: Richard Henderson <[e-mail]>

True, but it makes the function clunkier to use. Does it really
make a noticeable difference to performance ?

thanks
-- PMM

Richard Henderson May 31, 2022, 2:34 p.m. UTC | #2

On 5/31/22 05:07, Peter Maydell wrote:
> On Mon, 23 May 2022 at 22:07, Richard Henderson
> <[e-mail]> wrote:
>>
>> We often have this value already handy in the caller.
>>
>> Signed-off-by: Richard Henderson <[e-mail]>
> 
> True, but it makes the function clunkier to use. Does it really
> make a noticeable difference to performance ?

Probably not.  I'll drop this one.


r~

Patch

diff --git a/target/arm/internals.h b/target/arm/internals.h
index fbb69e6919..09d25612af 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -1308,6 +1308,6 @@  void define_cortex_a72_a57_a53_cp_reginfo(ARMCPU *cpu);
 
 void aa32_max_features(ARMCPU *cpu);
 bool arm_singlestep_active(CPUARMState *env);
-bool arm_generate_debug_exceptions(CPUARMState *env);
+bool arm_generate_debug_exceptions(CPUARMState *env, int cur_el);
 
 #endif
diff --git a/target/arm/debug_helper.c b/target/arm/debug_helper.c
index 8d87b65a8d..a5363a5048 100644
--- a/target/arm/debug_helper.c
+++ b/target/arm/debug_helper.c
@@ -94,10 +94,8 @@  static bool aa32_generate_debug_exceptions(CPUARMState *env, int cur_el)
  * CheckSoftwareStep(), where it is elided because both branches would
  * always return the same value.
  */
-bool arm_generate_debug_exceptions(CPUARMState *env)
+bool arm_generate_debug_exceptions(CPUARMState *env, int cur_el)
 {
-    int cur_el = arm_current_el(env);
-
     if (is_a64(env)) {
         return aa64_generate_debug_exceptions(env, cur_el);
     } else {
@@ -111,9 +109,10 @@  bool arm_generate_debug_exceptions(CPUARMState *env)
  */
 bool arm_singlestep_active(CPUARMState *env)
 {
+    int cur_el = arm_current_el(env);
     return extract32(env->cp15.mdscr_el1, 0, 1)
         && arm_el_is_aa64(env, arm_debug_target_el(env))
-        && arm_generate_debug_exceptions(env);
+        && arm_generate_debug_exceptions(env, cur_el);
 }
 
 /* Return true if the linked breakpoint entry lbn passes its checks */
@@ -309,7 +308,7 @@  static bool check_watchpoints(ARMCPU *cpu)
      * exceptions here then watchpoint firings are ignored.
      */
     if (extract32(env->cp15.mdscr_el1, 15, 1) == 0
-        || !arm_generate_debug_exceptions(env)) {
+        || !arm_generate_debug_exceptions(env, arm_current_el(env))) {
         return false;
     }
 
@@ -333,7 +332,7 @@  bool arm_debug_check_breakpoint(CPUState *cs)
      * exceptions here then breakpoint firings are ignored.
      */
     if (extract32(env->cp15.mdscr_el1, 15, 1) == 0
-        || !arm_generate_debug_exceptions(env)) {
+        || !arm_generate_debug_exceptions(env, arm_current_el(env))) {
         return false;
     }
 
diff --git a/target/arm/helper-a64.c b/target/arm/helper-a64.c
index 22db213aab..fe2a0aa261 100644
--- a/target/arm/helper-a64.c
+++ b/target/arm/helper-a64.c
@@ -924,7 +924,7 @@  void HELPER(exception_return)(CPUARMState *env, uint64_t new_pc)
      * We check 1 here and 2 after we've done the pstate/cpsr write() to
      * transition to the EL we're going to.
      */
-    if (arm_generate_debug_exceptions(env)) {
+    if (arm_generate_debug_exceptions(env, cur_el)) {
         spsr &= ~PSTATE_SS;
     }