Useful Powerpc Instructions

Here are some of Powerpc instructions. Good articles on PPC assembly in the following link; I got this listing from this article ....

http://www.ibm.com/developerworks/library/l-powasm1.html

li REG, VALUE

loads register REG with the number VALUE

add REGA, REGB, REGC

adds REGB with REGC and stores the result in REGA

addi REGA, REGB, VALUE

add the number VALUE to REGB and stores the result in REGA

mr REGA, REGB

copies the value in REGB into REGA

or REGA, REGB, REGC

performs a logical "or" between REGB and REGC, and stores the result in REGA

ori REGA, REGB, VALUE

performs a logical "or" between REGB and VALUE, and stores the result in REGA

and, andi, xor, xori, nand, nand, and nor

all of these follow the same pattern as "or" and "ori" for the other logical operations

ld REGA, 0(REGB)

use the contents of REGB as the memory address of the value to load into REGA

lbz, lhz, and lwz

all of these follow the same format, but operate on bytes, halfwords, and words, respectively (the "z" indicates that they also zero-out the rest of the register)

b ADDRESS

jump (or branch) to the instruction at address ADDRESS

bl ADDRESS

subroutine call to address ADDRESS

cmpd REGA, REGB

compare the contents of REGA and REGB, and set the bits of the status register appropriately

beq ADDRESS

branch to ADDRESS if the previously compared register contents were equal

bne, blt, bgt, ble, and bge

all of these follow the same form, but check for inequality, less than, greater than, less than or equal to, and greater than or equal to, respectively.

std REGA, 0(REGB)

use the contents of REGB as the memory address to save the value of REGA into

stb, sth, and stw

all of these follow the same format, but operate on bytes, halfwords, and words, respectively

sc

makes a system call to the kernel