fix: no exception information output, when the system is abnormal after holding

the scheduling lock in SMP.

Change-Id: Idb793a5446126e638af52ff78b43bb7f8271317c

arch/arm/arm/include/los_hw_cpu.h

@@ -189,6 +189,24 @@ STATIC INLINE UINT32 ArchIntUnlock(VOID)
     return intSave;
 }
 
+STATIC INLINE VOID ArchIrqDisable(VOID)
+{
+    __asm__ __volatile__(
+        "cpsid  i      "
+        :
+        :
+        : "memory", "cc");
+}
+
+STATIC INLINE VOID ArchIrqEnable(VOID)
+{
+    __asm__ __volatile__(
+        "cpsie  i      "
+        :
+        :
+        : "memory", "cc");
+}
+
 #else
 
 STATIC INLINE UINT32 ArchIntLock(VOID)

arch/arm/arm/src/los_exc.c

@@ -185,18 +185,32 @@ STATIC INT32 OsDecodeDataFSR(UINT32 regDFSR)
 #ifdef LOSCFG_KERNEL_VM
 UINT32 OsArmSharedPageFault(UINT32 excType, ExcContext *frame, UINT32 far, UINT32 fsr)
 {
-    PRINT_INFO("page fault entry!!!\n");
-    BOOL instruction_fault = FALSE;
+    BOOL instructionFault = FALSE;
     UINT32 pfFlags = 0;
     UINT32 fsrFlag;
     BOOL write = FALSE;
+    UINT32 ret;
+#ifdef LOSCFG_KERNEL_SMP
+    BOOL irqEnable = TRUE;
+#endif
 
+    PRINT_INFO("page fault entry!!!\n");
     if (OsGetSystemStatus() == OS_SYSTEM_EXC_CURR_CPU) {
         return LOS_ERRNO_VM_NOT_FOUND;
     }
-
+#ifdef LOSCFG_KERNEL_SMP
+    irqEnable = !(LOS_SpinHeld(&g_taskSpin) && (OsPercpuGet()->taskLockCnt != 0));
+    if (irqEnable) {
+        ArchIrqEnable();
+    } else {
+        PrintExcInfo("[ERR][%s] may be held scheduler lock when entering [%s]\n",
+                     OsCurrTaskGet()->taskName, __FUNCTION__);
+    }
+#else
+    ArchIrqEnable();
+#endif
     if (excType == OS_EXCEPT_PREFETCH_ABORT) {
-        instruction_fault = TRUE;
+        instructionFault = TRUE;
     } else {
         write = !!BIT_GET(fsr, WNR_BIT);
     }
@@ -214,13 +228,23 @@ UINT32 OsArmSharedPageFault(UINT32 excType, ExcContext *frame, UINT32 far, UINT3
             BOOL user = (frame->regCPSR & CPSR_MODE_MASK) == CPSR_MODE_USR;
             pfFlags |= write ? VM_MAP_PF_FLAG_WRITE : 0;
             pfFlags |= user ? VM_MAP_PF_FLAG_USER : 0;
-            pfFlags |= instruction_fault ? VM_MAP_PF_FLAG_INSTRUCTION : 0;
+            pfFlags |= instructionFault ? VM_MAP_PF_FLAG_INSTRUCTION : 0;
             pfFlags |= VM_MAP_PF_FLAG_NOT_PRESENT;
-            return OsVmPageFaultHandler(far, pfFlags, frame);
+            ret = OsVmPageFaultHandler(far, pfFlags, frame);
+            break;
         }
         default:
-            return LOS_ERRNO_VM_NOT_FOUND;
+            ret = LOS_ERRNO_VM_NOT_FOUND;
+            break;
+    }
+#ifdef LOSCFG_KERNEL_SMP
+    if (irqEnable) {
+        ArchIrqDisable();
     }
+#else
+    ArchIrqDisable();
+#endif
+    return ret;
 }
 #endif
 

arch/arm/arm/src/los_hw_exc.S

@@ -205,9 +205,7 @@ _osExceptSwiHdl:
     PUSH_FPU_REGS R1
 
     MOV     FP, #0                                           @ Init frame pointer
-    CPSIE   I
     BLX     OsArmA32SyscallHandle
-    CPSID   I
 
     POP_FPU_REGS R1
     ADD     SP, SP,#4