tcg: Introduce tcg_splitwx_to_{rx,rw}

Add two helper functions, using a global variable to hold
the displacement.  The displacement is currently always 0,
so no change in behaviour.

Begin using the functions in tcg common code only.

Reviewed-by: Joelle van Dyne <j@getutm.app>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/tcg/tci.c b/tcg/tci.c
index cf04404..017887b 100644
--- a/tcg/tci.c
+++ b/tcg/tci.c
@@ -481,9 +481,11 @@ static bool tci_compare64(uint64_t u0, uint64_t u1, TCGCond condition)
  * One possible operation in the pseudo code is a call to binary code.
  * Therefore, disable CFI checks in the interpreter function
  */
-uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env, void *v_tb_ptr)
+uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
+                                            const void *v_tb_ptr)
 {
-    uint8_t *tb_ptr = v_tb_ptr;
+    /* TODO: Propagate const through this file. */
+    uint8_t *tb_ptr = (uint8_t *)v_tb_ptr;
     tcg_target_ulong regs[TCG_TARGET_NB_REGS];
     long tcg_temps[CPU_TEMP_BUF_NLONGS];
     uintptr_t sp_value = (uintptr_t)(tcg_temps + CPU_TEMP_BUF_NLONGS);