ESP-IDF.patch

Subject: [PATCH] FPU_context_fix
---
Index: components/xtensa/xtensa_vectors.S
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/components/xtensa/xtensa_vectors.S b/components/xtensa/xtensa_vectors.S
--- a/components/xtensa/xtensa_vectors.S	(revision 3a45d4e949a174e8829a2e4c86c421b030ceac5a)
+++ b/components/xtensa/xtensa_vectors.S	(date 1751100427699)
@@ -3,7 +3,7 @@
  *
  * SPDX-License-Identifier: MIT
  *
- * SPDX-FileContributor: 2016-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileContributor: 2016-2023 Espressif Systems (Shanghai) CO LTD
  */
 /*
  * Copyright (c) 2015-2019 Cadence Design Systems, Inc.
@@ -1016,6 +1016,12 @@
     s32i    a2,  sp, XT_STK_A2
     s32i    a3,  sp, XT_STK_A3
     s32i    a4,  sp, XT_STK_A4
+#if portNUM_PROCESSORS > 1
+    /* If multicore, we must save two more interruptee's register to use as
+     * scratch when taking/releasing the _xt_coproc_owner_sa_lock spinlock. */
+    s32i    a6,  sp, XT_STK_A6
+    s32i    a7,  sp, XT_STK_A7
+#endif /* portNUM_PROCESSORS > 1 */
     s32i    a15, sp, XT_STK_A15
 
     /* Call the RTOS coprocessor exception hook */
@@ -1046,7 +1052,7 @@
 #if portNUM_PROCESSORS > 1
     /* If multicore, we must also acquire the _xt_coproc_owner_sa_lock spinlock
      * to ensure thread safe access of _xt_coproc_owner_sa between cores. */
-    spinlock_take a0 a2 _xt_coproc_owner_sa_lock
+    spinlock_take a6 a7 _xt_coproc_owner_sa_lock
 #endif /* portNUM_PROCESSORS > 1 */
 
     /* Get old coprocessor owner thread (save area ptr) and assign new one.  */
@@ -1057,7 +1063,7 @@
 
 #if portNUM_PROCESSORS > 1
     /* Release previously taken spinlock */
-    spinlock_release a0 a2 _xt_coproc_owner_sa_lock
+    spinlock_release a6 a7 _xt_coproc_owner_sa_lock
 #endif /* portNUM_PROCESSORS > 1 */
 
     /* Only need to context switch if new owner != old owner. */
@@ -1140,6 +1146,10 @@
     /* Can omit rsync for wsr.CPENABLE here because _xt_user_exit does it. */
 .L_xt_coproc_done:
     l32i    a15, sp, XT_STK_A15
+#if portNUM_PROCESSORS > 1
+    l32i    a6,  sp, XT_STK_A6
+    l32i    a7,  sp, XT_STK_A7
+#endif /* portNUM_PROCESSORS > 1 */
     l32i    a5,  sp, XT_STK_A5
     l32i    a4,  sp, XT_STK_A4
     l32i    a3,  sp, XT_STK_A3
@@ -1153,13 +1163,17 @@
     bnone   a2,  a0, .L_xt_coproc_done      /* if no match then done     */
     and     a2,  a2, a0                     /* a2 = which CPs to restore */
     extui   a2,  a2, 0, 8                   /* extract low 8 bits        */
+#if portNUM_PROCESSORS == 1
     s32i    a6,  sp, XT_STK_A6              /* save extra needed regs    */
     s32i    a7,  sp, XT_STK_A7
+#endif /* portNUM_PROCESSORS == 1 */
     s32i    a13, sp, XT_STK_A13
     s32i    a14, sp, XT_STK_A14
     call0   _xt_coproc_restorecs            /* restore CP registers      */
+#if portNUM_PROCESSORS == 1
     l32i    a6,  sp, XT_STK_A6              /* restore saved registers   */
     l32i    a7,  sp, XT_STK_A7
+#endif /* portNUM_PROCESSORS == 1 */
     l32i    a13, sp, XT_STK_A13
     l32i    a14, sp, XT_STK_A14
     j       .L_xt_coproc_done