Netwide assembler. TODO what does Netwide mean?
One of the most popular for Linux.
Open source.
Intel like syntax.
Input formats:
.asm, Intel like syntax
Most useful command line options:
-w+all: enable all warnings
NASM is way too gentle on input validation, even on -w+all.
In particular, anything unknown is happily treated as label, even if it does not have colon :.
Output format:
nasm -f elf32 main.asm
List all formats:
nasm -hf
You should always use this flag.
The default format of a default compilation (and that of Ubuntu 14.04) is bin, which generates raw instructions without any ELF metadata.
is not very useful http://stackoverflow.com/questions/2427011/what-is-the-difference-between-elf-files-and-bin-files
There seems to be no way to automatically decide a better choice: the default is a compilation option.
The following formats work:
elf32: Linux 32-bitelf64: Linux 64-bitbin: raw 16-bit. Useful to create boot setors. 32-bit memory addresses are encodable with the66hprefix.
git clone git://repo.or.cz/nasm.git
sh autogen.sh
./configure
make
make install