arch/arm: Add a "cc" flag to instructions that may modify condition flag.

Notify the compiler that the condition flag has changed to prevent the
compiler from optimizing and reordering instructions, which may cause exceptions.

Signed-off-by: zhangyuan21 <zhangyuan21@xiaomi.com>

arch/arm/include/arm/irq.h

@@ -187,7 +187,7 @@ static inline irqstate_t up_irq_save(void)
      "\tmsr    cpsr_c, %1"
      : "=r" (flags), "=r" (temp)
      :
-     : "memory");
+     : "cc", "memory");
   return flags;
 }
 
@@ -200,7 +200,7 @@ static inline void up_irq_restore(irqstate_t flags)
      "msr    cpsr_c, %0"
      :
      : "r" (flags)
-     : "memory");
+     : "cc", "memory");
 }
 
 /* Enable IRQs and return the previous IRQ state */
@@ -216,7 +216,7 @@ static inline irqstate_t up_irq_enable(void)
      "\tmsr    cpsr_c, %1"
      : "=r" (flags), "=r" (temp)
      :
-     : "memory");
+     : "cc", "memory");
   return flags;
 }
 #endif /* __ASSEMBLY__ */

arch/arm/include/armv7-m/irq.h

@@ -457,7 +457,7 @@ static inline void up_irq_restore(irqstate_t flags)
       "1:\n"
       :
       : "r" (flags)
-      : "memory");
+      : "cc", "memory");
 
 #endif
 }

arch/arm/include/armv8-m/irq.h

@@ -430,7 +430,7 @@ static inline void up_irq_restore(irqstate_t flags)
       "1:\n"
       :
       : "r" (flags)
-      : "memory");
+      : "cc", "memory");
 
 #endif
 }

arch/arm/src/tiva/common/lm4xx_tm3c_sysctrl.c

@@ -81,7 +81,7 @@ static inline void tiva_delay(uint32_t delay)
   __asm__ __volatile__("1:\n"
                        "\tsubs  %0, #1\n"
                        "\tbne   1b\n"
-                       : "=r"(delay) : "r"(delay));
+                       : "=r"(delay) : "r"(delay) : "cc");
 }
 
 /****************************************************************************

arch/arm/src/tiva/common/tiva_eeprom.c

@@ -164,7 +164,7 @@ static inline void tiva_delay(uint32_t delay)
   __asm__ __volatile__("1:\n"
                        "\tsubs  %0, #1\n"
                        "\tbne   1b\n"
-                       : "=r"(delay) : "r"(delay));
+                       : "=r"(delay) : "r"(delay) : "cc");
 }
 
 /****************************************************************************