Examples II

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Assigned Reading in Murdocca & Heuring:

Assigned Reading in Neveln:

Assigned:

Due:

Topics Covered:

We continued discussion of C function call conventions.
We looked examples of calling C functions from assembly language programs (e.g., calling printf()). We used gcc to link/load the program to avoid having to figure out the options to give to ld to get this to work.
We looked at C programs calling assembly language functions.
Discussed Project 2 from the Fall 2001.

Programs shown:

A simple C function converted to assembly language using gcc -S: cfunc.c, cfunc.s (AT&T style assembly), cfunc.asm (Intel style assembly), cfunc.txt.
A more complicated C function converted to assembly language using gcc -S (shown only briefly): cfunc.c, cfunc2.s (AT&T style assembly), cfunc2.asm (Intel style assembly).
A C function with a return value with size more than 4 bytes (shown only briefly): cfunc3.c, cfunc3.asm (The comments in this file were added afterwards).
An assembly language program that calls printf to write to stdout (with C style main function): printf1.asm, printf1.txt.
An assembly language program that calls printf to write to stdout (with assembly style _start entry point): printf2.asm, printf2.txt.
An example of a C program that calls a function implemented in assembly: arraytest.c, arrayinc.asm, arraytest.txt.
File related to previous semester's Project 2: bigint.h (header file for BigInt class), bigint.cpp (implementation of BigInt class), bimath.h (header file for C functions to be implemented in assembly), bimath-template.asm (assembly stubs for the functions in bimath.h), biadd.asm (sample assembly implementation for BI_Add).

Last Modified: 22 Jul 2024 11:29:34 EDT by Richard Chang