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#ifndef PSR_H
#define PSR_H
#include <stdint.h>
enum execution_mode {
MODE_USER = 0b10000,
MODE_FIQ = 0b10001,
MODE_IRQ = 0b10010,
MODE_SUPERVISOR = 0b10011,
MODE_MONITOR = 0b10110,
MODE_ABORT = 0b10111,
MODE_HYPERVISOR = 0b11010,
MODE_UNDEFINED = 0b11011,
MODE_SYSTEM = 0b11111,
};
typedef union
{
uint32_t raw;
struct
{
uint32_t M_4_0 : 5; // bits 4:0
uint32_t T : 1; // bit 5
uint32_t F : 1; // bit 6
uint32_t I : 1; // bit 7
uint32_t A : 1; // bit 8
uint32_t E : 1; // bit 9
uint32_t IT_7_2 : 6; // bits 15:10
uint32_t GE_3_0 : 4; // bits 19:16
uint32_t Bits_23_20 : 4; // bits 23:20
uint32_t J : 1; // bit 24
uint32_t IT_1_0 : 2; // bits 26:25
uint32_t Q : 1; // bit 27
uint32_t V : 1; // bit 28
uint32_t C : 1; // bit 29
uint32_t Z : 1; // bit 30
uint32_t N : 1; // bit 31
#define PSR_MODE_4_0 M_4_0
#define PSR_THUMB_BIT T
#define PSR_FIQ_MASKK_BIT F
#define PSR_IRQ_MASK_BIT I
#define PSR_ASYNC_ABORT_MASK_BIT A
#define PSR_ENDIANNESS_BIT E
#define PSR_IF_THEN_STATE_7_2 IT_7_2
#define PSR_GREATER_THAN_OR_EQUAL_FLAGS GE_3_0
// bits 23:20 are reserved
#define PSR_JAZELLE_BIT J
#define PSR_IF_THEN_STATE_1_0 IT_1_0
#define PSR_CUMULATIVE_SATURATION_BIT Q
#define PSR_OVERFLOW_CONDITION_BIT V
#define PSR_CARRY_CONDITION_BIT C
#define PSR_ZERO_CONDITION_BIT Z
#define PSR_NEGATIVE_CONDITION_BIT N
} fields;
} PSR_t;
inline static PSR_t read_CPSR(void)
{
PSR_t CPSR;
// get content of current program status register
asm("mrs %0, cpsr" : "=r" (CPSR.raw) :: "memory");
return CPSR;
}
inline static PSR_t read_SPSR(void)
{
PSR_t SPSR;
// get content of saved program status register
asm("mrs %0, spsr" : "=r" (SPSR.raw) :: "memory");
return SPSR;
}
inline static void write_SPSR(PSR_t SPSR)
{
// set content of saved program status register
asm("msr spsr, %0" :: "r" (SPSR.raw));
}
#endif // PSR_H
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