added nasm

added root directory, binary, and libraries for nasm to the dynamic-apps that can be run in bincompat mode.

Signed-off-by: Sina Mahdavi <[email protected]>

nasm/README.md

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+# Netwide Assembler
+
+This is the netwide assembler and it is meant to be used in the binary compatibility mode of unikraft.
+
+## Content
+- sample_code.s: a sample assembly code file that can be assembled using nasm.
+- usr/bin/nasm: the nasm binary
+- lib/ & lib64/: the required libraries for nasm
+
+## Extract dynamic libraries
+```../extract.sh usr/bin/nasm```
+
+output:
+```
+Copying /lib/x86_64-linux-gnu/libc.so.6 ...
+Copying /lib64/ld-linux-x86-64.so.2 ...
+```
+
+## Run on linux
+```nasm sample_code.s```
+
+## Run on unikraft
+```./run.sh -r ../dynamic-apps/nasm/ usr/bin/nasm sample_code.s```
+
+This should generate the output file ```sample_code``` which is the assembled machine code generated by nasm.

nasm/sample_code.s

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+BITS 64
+
+xor rax, rax
+test rdi, rdi
+jz end
+
+loop:
+cmp byte [rdi], 0
+jz end
+
+xor rbx, rbx
+mov bl, byte [rdi]
+cmp bl, 0x5a
+ja loop_end
+
+push rax
+push rdi
+mov rdi, rbx
+mov rax, 0x403000
+call rax
+pop rdi
+mov byte [rdi], al
+pop rax
+inc rax
+
+loop_end:
+inc rdi
+jmp loop
+
+end:
+ret