subx/examples/ex2.subx


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

# Add 1 and 1, and return the result in the exit code.
#
# To run (from the subx directory):
#   $ ./subx translate examples/ex2.subx -o examples/ex2
#   $ ./subx run examples/ex2
# Expected result:
#   $ echo $?
#   2

== code

# EBX = 1
bb/copy-to-EBX  1/imm32
# increment EBX
43/inc-EBX
# syscall(exit, EBX)
b8/copy-to-EAX  1/imm32/exit
cd/syscall  0x80/imm8

# . . vim:nowrap:textwidth=0