Modern Computer Architecture and Organization

Modern Computer Architecture and Organization, by Jim Ledin. Published by Packt Publishing.

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Chapter 11, Exercise 3

Write a RISC-V assembly language program that computes the following expression and prints the result as a hexadecimal number: {(129 – 66) × (445 + 136)} ÷ 3. As part of this program, create a callable function to print one byte as two hex digits.

Answer

Create a new Freedom Studio project using the same steps as in Exercise 1 in this chapter. Locate the hello.c file in the src folder in the Project window.

1. Right-click on the file and rename it to hello.s.

2. Create your assembly language source code within the hello.s file. See Ex__3_riscv_expr.s for an example solution to this exercise.

3. Perform a clean and then rebuild the project (press Ctrl+9 to initiate the clean operation).

4. Select Debug under the Run menu.

5. Once the debugger starts, open windows to display the hello.s source file, the Disassembly window, and the Registers window.

6. Expand the Registers tree to display the RISC-V processor registers.

7. Single-step through the program and verify the text [(129 - 66) * (445 + 136)] / 3 = 2FA9h appears in the Console window.

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