asm_helper.h

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#ifndef ASM_ASM_HELPER_H
#define ASM_ASM_HELPER_H
 
#define READ_SYS_REG(reg, val)                             \
    do {                                               \
        asm volatile("mrs %0, " #reg : "=r"(val)); \
    } while (0)
 
#define WRITE_SYS_REG(reg, val)                                \
    do {                                                   \
        asm volatile("msr " #reg ", %0" : : "r"(val)); \
    } while (0)
 
#endif /* ASM_ASM_HELPER_H */