Convert simple HelloWorld.c (C) in Assembly(AT&T)
C:
#gcc helloworld.c -o helloworld
/* Hello World program */
#include<stdio.h>
main()
{
printf(“Hello World”);
}
Assembly (AT&T)
#gcc -O3 -S -masm=intel -mtune=native -fverbose-asm helloworld.c
Assembly:
.file “helloworld.c”
.intel_syntax noprefix
# GNU C11 (GCC) version 5.1.1 20150618 (Red Hat 5.1.1-4) (x86_64-redhat-linux)
# compiled by GNU C version 5.1.1 20150618 (Red Hat 5.1.1-4), GMP version 6.0.0, MPFR version 3.1.2, MPC version 1.0.2
# warning: MPFR header version 3.1.2 differs from library version 3.1.3.
# GGC heuristics: –param ggc-min-expand=100 –param ggc-min-heapsize=131072
# options passed: helloworld.c –param l1-cache-size=32
# –param l1-cache-line-size=64 –param l2-cache-size=4096 -mtune=haswell
# -masm=intel -march=x86-64 -O3 -fverbose-asm
# options enabled: -faggressive-loop-optimizations -falign-labels
# -fasynchronous-unwind-tables -fauto-inc-dec -fbranch-count-reg
# -fcaller-saves -fchkp-check-incomplete-type -fchkp-check-read
# -fchkp-check-write -fchkp-instrument-calls -fchkp-narrow-bounds
# -fchkp-optimize -fchkp-store-bounds -fchkp-use-static-bounds
# -fchkp-use-static-const-bounds -fchkp-use-wrappers
# -fcombine-stack-adjustments -fcommon -fcompare-elim -fcprop-registers
# -fcrossjumping -fcse-follow-jumps -fdefer-pop
# -fdelete-null-pointer-checks -fdevirtualize -fdevirtualize-speculatively
# -fdwarf2-cfi-asm -fearly-inlining -feliminate-unused-debug-types
# -fexpensive-optimizations -fforward-propagate -ffunction-cse -fgcse
# -fgcse-after-reload -fgcse-lm -fgnu-runtime -fgnu-unique
# -fguess-branch-probability -fhoist-adjacent-loads -fident -fif-conversion
# -fif-conversion2 -findirect-inlining -finline -finline-atomics
# -finline-functions -finline-functions-called-once
# -finline-small-functions -fipa-cp -fipa-cp-alignment -fipa-cp-clone
# -fipa-icf -fipa-icf-functions -fipa-icf-variables -fipa-profile
# -fipa-pure-const -fipa-ra -fipa-reference -fipa-sra -fira-hoist-pressure
# -fira-share-save-slots -fira-share-spill-slots
# -fisolate-erroneous-paths-dereference -fivopts -fkeep-static-consts
# -fleading-underscore -flifetime-dse -flra-remat -flto-odr-type-merging
# -fmath-errno -fmerge-constants -fmerge-debug-strings
# -fmove-loop-invariants -fomit-frame-pointer -foptimize-sibling-calls
# -foptimize-strlen -fpartial-inlining -fpeephole -fpeephole2
# -fpredictive-commoning -fprefetch-loop-arrays -free -freg-struct-return
# -freorder-blocks -freorder-blocks-and-partition -freorder-functions
# -frerun-cse-after-loop -fsched-critical-path-heuristic
# -fsched-dep-count-heuristic -fsched-group-heuristic -fsched-interblock
# -fsched-last-insn-heuristic -fsched-rank-heuristic -fsched-spec
# -fsched-spec-insn-heuristic -fsched-stalled-insns-dep -fschedule-fusion
# -fschedule-insns2 -fsemantic-interposition -fshow-column -fshrink-wrap
# -fsigned-zeros -fsplit-ivs-in-unroller -fsplit-wide-types -fssa-phiopt
# -fstdarg-opt -fstrict-aliasing -fstrict-overflow
# -fstrict-volatile-bitfields -fsync-libcalls -fthread-jumps
# -ftoplevel-reorder -ftrapping-math -ftree-bit-ccp -ftree-builtin-call-dce
# -ftree-ccp -ftree-ch -ftree-coalesce-vars -ftree-copy-prop
# -ftree-copyrename -ftree-cselim -ftree-dce -ftree-dominator-opts
# -ftree-dse -ftree-forwprop -ftree-fre -ftree-loop-distribute-patterns
# -ftree-loop-if-convert -ftree-loop-im -ftree-loop-ivcanon
# -ftree-loop-optimize -ftree-loop-vectorize -ftree-parallelize-loops=
# -ftree-partial-pre -ftree-phiprop -ftree-pre -ftree-pta -ftree-reassoc
# -ftree-scev-cprop -ftree-sink -ftree-slp-vectorize -ftree-slsr -ftree-sra
# -ftree-switch-conversion -ftree-tail-merge -ftree-ter -ftree-vrp
# -funit-at-a-time -funswitch-loops -funwind-tables -fverbose-asm
# -fzero-initialized-in-bss -m128bit-long-double -m64 -m80387
# -malign-stringops -mfancy-math-387 -mfp-ret-in-387 -mfxsr -mglibc
# -mieee-fp -mlong-double-80 -mmmx -mno-sse4 -mpush-args -mred-zone -msse
# -msse2 -mtls-direct-seg-refs -mvzeroupper
.section .rodata.str1.1,”aMS”,@progbits,1
.LC0:
.string “Hello World”
.section .text.unlikely,”ax”,@progbits
.LCOLDB1:
.section .text.startup,”ax”,@progbits
.LHOTB1:
.p2align 4,,15
.globl main
.type main, @function
main:
.LFB11:
.cfi_startproc
sub rsp, 8 #,
.cfi_def_cfa_offset 16
mov edi, OFFSET FLAT:.LC0 #,
xor eax, eax #
call printf #
xor eax, eax #
add rsp, 8 #,
.cfi_def_cfa_offset 8
ret
.cfi_endproc
.LFE11:
.size main, .-main
.section .text.unlikely
.LCOLDE1:
.section .text.startup
.LHOTE1:
.ident “GCC: (GNU) 5.1.1 20150618 (Red Hat 5.1.1-4)”
.section .note.GNU-stack,””,@progbits
@firebitsbr
VSLA - Virtual Security Labs Anywhere 