6.4. MIPS Example

As a demonstration of a fact that there's a universe other than x86, here comes an example program for MIPS by Spencer Parkin. BTW, if you've got here, you may also want to see A Collection of Assembler Hello World Programs.

# hello.S by Spencer T. Parkin # This is my first MIPS-RISC assembly program! # To compile this program type: # > gcc -o hello hello.S -non_shared # This program compiles without errors or warnings # on a PlayStation2 MIPS R5900 (EE Core). # EE stands for Emotion Engine...lame! # The -non_shared option tells gcc that we`re # not interrested in compiling relocatable code. # If we were, we would need to follow the PIC- # ABI calling conventions and other protocols. #include <asm/regdef.h> // ...for human readable register names #include <asm/unistd.h> // ...for system serivices .rdata # begin read-only data segment .align 2 # because of the way memory is built hello: .asciz "Hello, world!\n" # a null terminated string .align 4 # because of the way memory is built length: .word . - hello # length = IC - (hello-addr) .text # begin code segment .globl main # for gcc/ld linking .ent main # for gdb debugging info. main: # We must specify -non_shared to gcc or we`ll need these 3 lines that fallow. # .set noreorder # disable instruction reordering # .cpload t9 # PIC ABI crap (function prologue) # .set reorder # re-enable instruction reordering move a0,$0 # load stdout fd la a1,hello # load string address lw a2,length # load string length li v0,__NR_write # specify system write service syscall # call the kernel (write string) li v0,0 # load return code j ra # return to caller .end main # for dgb debugging info. # That`s all folks!