RISC-V assembly language

The following RISC-V assembly language example is a complete application that runs on a RISC-V processor:

.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"

This program prints the following message in a console window and then exits:

Hello, Computer Architect!

The following are some points of interest within the assembly code:

• The %pcrel_hi and %pcrel_lo directives select the high 20 bits (%pcrel_hi) or low 12 bits (%pcrel_lo) of the PC-relative address of the label provided as an argument. The combination...