Computer Engineering

#include <stdio.h> #include <stdint.h> #include <stdbool.h> #define MY_ARRAY_BASE (0x20010000) // Functions defined in a .s file extern void task10(void); extern void task11(void); extern void task12(void); extern void task13(void); extern void task14(void); extern void task15(void); // Global variable // Pointers for the C version. int8_t *gPtrArray10c = (int8_t *) (MY_ARRAY_BASE + 0x00); uint8_t *gPtrArray11c = (uint8_t *) (MY_ARRAY_BASE + 0x40); int16_t *gPtrArray12c = (int16_t *) (MY_ARRAY_BASE + 0x80); uint16_t *gPtrArray13c = (uint16_t *) (MY_ARRAY_BASE + 0xC0); int32_t *gPtrArray14c = (int32_t *) (MY_ARRAY_BASE + 0x100); uint32_t *gPtrArray15c = (uint32_t *) (MY_ARRAY_BASE + 0x140); // Pointers for the asm version. int8_t *gPtrArray10a = (int8_t *) (MY_ARRAY_BASE + 0x20); uint8_t *gPtrArray11a = (uint8_t *) (MY_ARRAY_BASE + 0x60); int16_t *gPtrArray12a = (int16_t *) (MY_ARRAY_BASE + 0xA0); uint16_t *gPtrArray13a = (uint16_t *) (MY_ARRAY_BASE + 0xE0); int32_t *gPtrArray14a = (int32_t *) (MY_ARRAY_BASE + 0x120); uint32_t *gPtrArray15a = (uint32_t *) (MY_ARRAY_BASE + 0x160); int8_t gVar1 = 8; int main(void) { // Task 10. Register offset-based addressing---a simple example. for (int i = 0; i < gVar1; i++) { *(gPtrArray10c + i) = (int8_t)(i*4 - 15); // i is saved in a register } task10(); // task10: perform the above task using assembly // Task 11. Register offset-based addressing---another simple example. for (int i = 0; i < gVar1; i++) { *(gPtrArray11c + i) = (uint8_t)(i*32 + 2); } task11(); // task11: perform the above task using assembly // Task 12. Register offset-based addressing---more complicated case. for (int i = 0; i < gVar1; i++) { *(gPtrArray12c + i) = 10 - (*(gPtrArray10c + i))++; } // Note that the input data is changed as well in the above line task12(); // task12: perform the above task using assembly // Task 13. Immediate offset addressing. for (int i = 0; i < gVar1-1; i++) { // We use immediate offset addressing twice below (righthand side) *(gPtrArray13c + i) = *(gPtrArray11c) + *(gPtrArray11c+1); gPtrArray11c++; } task13(); // task13: perform the above task using assembly // Task 14. Immediate offset addressing and pre-index addressing. for (int i = 0; i < gVar1-1; i++) { uint32_t temp = *(gPtrArray12c); *(gPtrArray14c + i) = temp + 8 * (*(++gPtrArray12c)); } task14(); // task14: perform the above task using assembly // Task 15. Post-index addressing and immediate offset addressing. for (int i = 0; i < gVar1-1; i++) { uint32_t temp = *(gPtrArray13c++); *(gPtrArray15c + i) = temp + 16 * (*gPtrArray13c); } task15(); // task15: perform the above task using assembly while (1); }