혼자왔니

- 목적파일 구조는 8-비트 와 32비트 구조를 가진 다양한 CPU들을 지원한다.

    Size  Alignment        Purpose

Elf32_Addr    4    4    Unsigned program address

Elf32_Half     2    2     Unsigned medium integer

Elf32_Off       4    4    Unsigned file offset

Elf32_Sword   4   4    Signed large integer

Elf32_Word    4    4    Unsigned large integer

unsgined char   1 1  unsgined small integer

include/uapi/linux/elf.h

/* 32-bit ELF base types. */ typedef __u32 Elf32_Addr; typedef __u16 Elf32_Half; typedef __u32 Elf32_Off; typedef __s32 Elf32_Sword; typedef __u32 Elf32_Word; /* 64-bit ELF base types. */ typedef __u64 Elf64_Addr; typedef __u16 Elf64_Half; typedef __s16 Elf64_SHalf; typedef __u64 Elf64_Off; typedef __s32 Elf64_Sword; typedef __u32 Elf64_Word; typedef __u64 Elf64_Xword; typedef __s64 Elf64_Sxword;

#define EI_NIDENT 16 typedef struct elf32_hdr{ unsigned char e_ident[EI_NIDENT]; Elf32_Half e_type; Elf32_Half e_machine; Elf32_Word e_version; Elf32_Addr e_entry; /* Entry point */ Elf32_Off e_phoff; Elf32_Off e_shoff; Elf32_Word e_flags; Elf32_Half e_ehsize; Elf32_Half e_phentsize; Elf32_Half e_phnum; Elf32_Half e_shentsize; Elf32_Half e_shnum; Elf32_Half e_shstrndx; } Elf32_Ehdr; typedef struct elf64_hdr { unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ Elf64_Half e_type; Elf64_Half e_machine; Elf64_Word e_version; Elf64_Addr e_entry; /* Entry point virtual address */ Elf64_Off e_phoff; /* Program header table file offset */ Elf64_Off e_shoff; /* Section header table file offset */ Elf64_Word e_flags; Elf64_Half e_ehsize; Elf64_Half e_phentsize; Elf64_Half e_phnum; Elf64_Half e_shentsize; Elf64_Half e_shnum; Elf64_Half e_shstrndx; } Elf64_Ehdr;

rvct_assembler_guide

arm-linux-androideabi-as -o hello.o hello.S
arm-linux-androideabi-ld -s -o hello hello.o

uboot/arch/arm/cpu/armv7  의 start.S

어셈의 종류로는 (MASM, SPIM, GAS)

라즈베리파이에서 어셈블러 gdb

pi@raspberrypi ~/asm $ as --gstabs+ hello.asm -o hello.
pi@raspberrypi ~/asm $ ld hello.o -o hello1

hello1 파일 생성

[변수와 레지스터 값]
info locals 지역변수들을 보여준다.
info variables 전역 변수 리스트를 확인할 수 있다.

p(print)
p [variable] 변수 값 출력
p [function] 함수의 주소

p $[register] 레지스터 출력
p $eax 등등
info registers
info all-registers

arm-linux-gnueabihf-gcc 와 arm-linux-gnueabi-gcc 차이

http://hybridego.net/entry/armlinuxgnueabihfgcc-%EC%99%80-armlinuxgnueabigcc-%EC%B0%A8%EC%9D%B4

gas - http://korea.gnu.org/manual/release/as/as-ko_7.html

GNU 어셈블러 지시자 정리

falinux - http://forum.falinux.com/zbxe/index.php?document_srl=550700 

 glbl  https://kldp.org/node/96304

x86 에서 asm  http://www.joinc.co.kr/modules/moniwiki/wiki.php/Site/Assembly/Documents/ProgrammingGroundUp/makefirstprog.html

arm debug

http://tydud.tistory.com/125

레이블

 -

android native 디버그?

http://zeph1e.tistory.com/13

PCSPIM 설치 및 사용법

http://blog.naver.com/lovelydai/188188533