#include "stack.h"
#include "vga.h"

void printStackTrace(unsigned int maxFrames){
#ifdef DEBUG
	// Now on Stack:
	// 	( potential second function argument )
	//	first function argument (maxFrames)
	//	return address from caller
	//	EBP (Extended Base Pointer) of calling function
	unsigned int * ebp = &maxFrames - 2;
	for (unsigned int frame = 0 ; frame < maxFrames; frame ++){
		unsigned int eip = ebp [1];
		if (eip == 0){
			// No caller on stack
			break;
		}
		ebp = (unsigned int *)(ebp[0]);
		//unsigned int * arguments = &ebp[2];
		printf("    0x%x\n", eip);
	}
#else
	printf("Must be compiled with -fno-omit-frame-pointer for full stack\n");
	unsigned int * ebp = &maxFrames - 2;
	unsigned int eip = ebp [1];
	printf("Caller:    0x%x\n", eip);
#endif
}