[PATCH 01/18] target/arm: Allow raise_exception to handle finding target EL

[Richard Henderson]

The work of finding the correct target EL for an exception is
currently split between raise_exception and target_exception_el.
Begin merging these by allowing the input to raise_exception
to be zero and use exception_target_el for that case.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/internals.h | 11 ++++++-----
 target/arm/op_helper.c | 13 +++++++++----
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/target/arm/internals.h b/target/arm/internals.h
index b654bee468..03363b0f32 100644
--- a/target/arm/internals.h
+++ b/target/arm/internals.h
@@ -111,18 +111,19 @@ FIELD(DBGWCR, SSCE, 29, 1)
 /**
  * raise_exception: Raise the specified exception.
  * Raise a guest exception with the specified value, syndrome register
- * and target exception level. This should be called from helper functions,
- * and never returns because we will longjump back up to the CPU main loop.
+ * and the current or target exception level. This should be called from
+ * helper functions, and never returns because we will longjump back up
+ * to the CPU main loop.
  */
 G_NORETURN void raise_exception(CPUARMState *env, uint32_t excp,
-                                uint32_t syndrome, uint32_t target_el);
+                                uint32_t syndrome, uint32_t cur_or_target_el);
 
 /*
  * Similarly, but also use unwinding to restore cpu state.
  */
 G_NORETURN void raise_exception_ra(CPUARMState *env, uint32_t excp,
-                                      uint32_t syndrome, uint32_t target_el,
-                                      uintptr_t ra);
+                                   uint32_t syndrome,
+                                   uint32_t cur_or_target_el, uintptr_t ra);
 
 /*
  * For AArch64, map a given EL to an index in the banked_spsr array.
diff --git a/target/arm/op_helper.c b/target/arm/op_helper.c
index c4bd668870..6b9141b79a 100644
--- a/target/arm/op_helper.c
+++ b/target/arm/op_helper.c
@@ -28,10 +28,15 @@
 #define SIGNBIT (uint32_t)0x80000000
 #define SIGNBIT64 ((uint64_t)1 << 63)
 
-void raise_exception(CPUARMState *env, uint32_t excp,
-                     uint32_t syndrome, uint32_t target_el)
+void raise_exception(CPUARMState *env, uint32_t excp, uint32_t syndrome,
+                     uint32_t cur_or_target_el)
 {
     CPUState *cs = env_cpu(env);
+    int target_el = cur_or_target_el;
+
+    if (cur_or_target_el == 0) {
+        target_el = exception_target_el(env);
+    }
 
     if (target_el == 1 && (arm_hcr_el2_eff(env) & HCR_TGE)) {
         /*
@@ -54,7 +59,7 @@ void raise_exception(CPUARMState *env, uint32_t excp,
 }
 
 void raise_exception_ra(CPUARMState *env, uint32_t excp, uint32_t syndrome,
-                        uint32_t target_el, uintptr_t ra)
+                        uint32_t cur_or_target_el, uintptr_t ra)
 {
     CPUState *cs = env_cpu(env);
 
@@ -64,7 +69,7 @@ void raise_exception_ra(CPUARMState *env, uint32_t excp, 
uint32_t syndrome,
      * the caller passed us, and cannot use cpu_loop_exit_restore().
      */
     cpu_restore_state(cs, ra, true);
-    raise_exception(env, excp, syndrome, target_el);
+    raise_exception(env, excp, syndrome, cur_or_target_el);
 }
 
 uint64_t HELPER(neon_tbl)(CPUARMState *env, uint32_t desc,
-- 
2.34.1