Learn with SHAKTI

My First ASM Program

spike simulates the real hardware. The necessary files to compile and simulate an ASM program in spike environment, are hosted inside the spiking folder. Learn more about spike, vim editor, RISC-V GDB and OpenOCD!

Please, copy and paste the below commands to download the spiking folder.

cd $HOME

git clone https://gitlab.com/shaktiproject/software/spiking.git

Move to spiking folder.

cd spiking

Open a file in a text editor and save it inside spiking folder

vim example.S

gedit example.S

example.S content:

_start:
   	   srai x17, x0,1
	   srai x12, x0,1
	   srai x10, x0,1
	   srai x15, x0,1
	   srai x6, x0,1
	   addi  x10, x10, 1
	   addi  x12, x10, 13
	   addi  x17, x10, 64
	   la x15, _data1          #store _data1 loc to x15
	   addi x17,x0, 0x10       #comparing register for end of loop
	   addi x14,x0, 0x0        #index
loop:      lw x16, 0(x15)          #load value from x15 pointing location to x16 reg  # loop is a label
	   addi x15, x15, 0x04     #goto next location
	   addi x14, x14, 0x04
           bne  x14,x17,loop       #check for equality, if not equal jump loop label.
	   sw x17, 0x60(x15)
	   lw x12, 0x60(x15)
	   bnez x10, _start
.p2align 0x2                       # aligned to two bytes
.section .data                     # data section starts
_data1:
.word 	7                          # First data in data section
.word 	6
.word 	5
.word 	4

Compile

Before starting compilation, Please check if the shakti-tools are successfully installed.

Please ensure you're inside spiking folder and run the below command

riscv64-unknown-elf-gcc -nostdlib -nostartfiles -T spike.lds  example.S -o example.elf

On successful compilation, a executable binary named example.elf will be generated.

Object dump for the compiled ASM Program

riscv64-unknown-elf-objdump displays the dis-assembled code of the elf file.

riscv64-unknown-elf-objdump -d example.elf &> example.dump

Use vim or gedit to view the objdump file created i.e log

vim example.dump

gedit example.dump

Learn with SHAKTI

My First ASM Program

Open a file in a text editor and save it inside spiking folder

Compile

Object dump for the compiled ASM Program

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