start working through the pgu book.

it's quite interesting and surprisingly accessible.

pgu/01_arch/README.md

@@ -0,0 +1,9 @@
# Programming from the ground up
Despite knowing about basic cpu architecture I have never actually
written any "real" assembler program. Here I aim to fix that. I
currently use the [Programming from the ground up][pgu-book] book, but
if you know anything similar that has helped you understand how a
computer works at the levels below C, please tell me.
[pgu-book]: http://www.cs.princeton.edu/courses/archive/spr08/cos217/reading/ProgrammingGroundUp-1-0-lettersize.pdf

pgu/01_arch/exit.s

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.section .data
.section .text
.globl _start
_start:
	movl $1, %eax
	movl $0, %ebx
	int $0x80

pgu/01_arch/maximum.s

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.section .data
numbers:
	.long 3,67,34,222,65,45,75,54,34,44,33,22,11,66,0
.section .text
.globl _start
_start:
	movl $0, %edi
	movl numbers(,%edi,4), %eax
	movl %eax, %ebx
loop_start:
	cmpl $0, %eax
	je loop_exit
	incl %edi
	movl numbers(,%edi,4), %eax
	cmpl %ebx, %eax
	jle loop_start
	movl %eax, %ebx
	jmp loop_start
loop_exit:
	movl $1, %eax
	int $0x80