Hello World - PPC64LE Assembly

hello.s

## Hello World - PPC64LE Assembly
## This is the ELF ABI v2 little-endian equivalent of
## https://developer.ibm.com/articles/l-ppc/#listing-4-hello-world-ppc64-assembly
##
## Cross-compile as shown below.
## 	$ powerpc64le-linux-gnu-as hello.s -o hello.o
##	$ powerpc64le-linux-gnu-ld hello.o -o hello
##
## Author: Sandipan Das <sandipan@linux.ibm.com>
##

.data					# section declaration - variables only

msg:
	.string "Hello, world!\n"
	len = . - msg			# length of our dear string

.text					# section declaration - begin code
	.abiversion 2
	.global _start

_start:

# write our string to stdout

	li	0, 4			# syscall number (sys_write)
	li	3, 1			# first argument: file descriptor (stdout)
					# second argument: pointer to message to write

	# load the address of 'msg':

					# load high word into the low word of r4:
	lis	4, msg@highest		# load msg bits 48-63 into r4 bits 16-31
	ori	4, 4, msg@higher	# load msg bits 32-47 into r4 bits  0-15
	rldicr	4, 4, 32, 31		# rotate r4's low word into r4's high word

	# load low word into the low word of r4:
	oris	4, 4, msg@h		# load msg bits 16-31 into r4 bits 16-31
	ori	4, 4, msg@l		# load msg bits  0-15 into r4 bits  0-15

	# done loading the address of 'msg'

	li	5, len			# third argument: message length
	sc				# call kernel

# and exit

	li	0, 1			# syscall number (sys_exit)
	li	3, 0			# first argument: exit code
	sc				# call kernel