[v1] target/arm: Implement FEAT_GCS

[PATCH 68/82] target/arm: Copy EXLOCKEn to EXLOCK on exception to the same EL

Posted by Richard Henderson 4 months, 2 weeks ago

Per R_WTXBY, PSTATE.EXLOCK is 0 on an exception to a higher EL,
and copied from EXLOCKEn otherwise.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/helper.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 2514a03c0e..23e54684c4 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -9300,8 +9300,13 @@ static void arm_cpu_do_interrupt_aarch64(CPUState *cs)
         } else {
             addr += 0x600;
         }
-    } else if (pstate_read(env) & PSTATE_SP) {
-        addr += 0x200;
+    } else {
+        if (pstate_read(env) & PSTATE_SP) {
+            addr += 0x200;
+        }
+        if (is_a64(env) && (env->cp15.gcscr_el[new_el] & GCSCR_EXLOCKEN)) {
+            new_mode |= PSTATE_EXLOCK;
+        }
     }
 
     switch (cs->exception_index) {
-- 
2.43.0

Re: [PATCH 68/82] target/arm: Copy EXLOCKEn to EXLOCK on exception to the same EL

Posted by Pierrick Bouvier 4 months, 2 weeks ago

On 7/27/25 1:02 AM, Richard Henderson wrote:
> Per R_WTXBY, PSTATE.EXLOCK is 0 on an exception to a higher EL,
> and copied from EXLOCKEn otherwise.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   target/arm/helper.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>