diff options
Diffstat (limited to 'include/arm.h')
| -rw-r--r-- | include/arm.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/include/arm.h b/include/arm.h new file mode 100644 index 0000000..51a485b --- /dev/null +++ b/include/arm.h @@ -0,0 +1,55 @@ +#ifndef INCLUDE_ARM_H_ +#define INCLUDE_ARM_H_ + +#include <stdint.h> + +typedef void (*funcptr_t)(void); + +volatile struct _ExceptionTable { + funcptr_t unknown1; + funcptr_t entry; + funcptr_t NMIException; + funcptr_t HardFaultException; + funcptr_t MemManageException; + funcptr_t BusFaultException; + funcptr_t UsageFaultException; + funcptr_t unknown2[4]; + funcptr_t SVCHandler; + funcptr_t DebugMonitor; + funcptr_t unknown3; + funcptr_t PendSVC; + funcptr_t SysTickHandler; + funcptr_t InterruptHandler[]; +} __attribute__ ((packed)) *ExceptionTable; + +volatile struct _SystemControlBlock { + uint32_t CPUID; + uint32_t ICSR; + uint32_t VTOR; + uint32_t AIRCR; + uint32_t SCR; + uint32_t CCR; + uint32_t SHPR[3]; + uint32_t SHCRS; + uint8_t MMSR; + uint8_t BFSR; + uint16_t UFSR; + uint32_t HFSR; + uint32_t unused1; + uint32_t MMAR; + uint32_t BFAR; + uint32_t AFSR; +} __attribute__ ((packed)) *SystemControlBlock = (struct _SystemControlBlock *)0xE000ED00; + +/** + * "Allow" divide by zero instructions to be run. + * + * By setting this bit in the CCR the Cortex will handle divide by zero + * instructions by returning a quotient of 0. + */ + +void handleDiv0(void){ + SystemControlBlock->CCR |= (1<<4); +} + +#endif // INCLUDE_ARM_H_ |