Modern Computer Architecture and Organization

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


Chapter 11, Exercise 2

With the project from Exercise 1 still open, locate the hello.c file in the src folder in the Project window. Right-click on the file and rename it to hello.s. Open hello.s in the editor and delete the entire contents. Insert the assembly language program shown in the RISC-V assembly language section in this chapter. Perform a clean and then rebuild the project (press Ctrl+9 to initiate the clean operation). Select Debug under the Run menu. Once the debugger starts, open windows to display the hello.s source file, the Disassembly window, and the Registers window. Expand the Registers tree to display the RISC-V processor registers. Single-step through the program and verify the text Hello, Computer Architect! appears in the Console window.

Answer

With the project from Exercise 1 still open, locate the hello.c file in the src folder in the Project window, then do the following:

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

  2. Open hello.s in the editor and delete the entire contents.

  3. Insert the assembly language program shown in the RISC-V assembly language section in this chapter. This is the assembly code, also available in Ex__2_riscv_assembly.s:

.section .text
.global main

main:
    # Reserve stack space and save the return address
    addi    sp, sp, -16
    sd      ra, 0(sp)

    # Print the message using the C library puts function
1:  auipc   a0, %pcrel_hi(msg)
    addi    a0, a0, %pcrel_lo(1b)
    jal     ra, puts

    # Restore the return address and sp, and return to caller
    ld      ra, 0(sp)
    addi    sp, sp, 16
    jalr    zero, ra, 0

.section .rodata
msg:
    .asciz "Hello, Computer Architect!\n"

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

  2. Select Debug under the Run menu.

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

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

  5. Single-step through the program and verify the text Hello, Computer Architect! appears in the Console window.

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