基于Android的ARM匯編語言系列之二：C/C++程序生成ARM匯編程序

之一：ARM匯編語言開篇
之二：C/C++程序生成ARM匯編程序的過程分析
之三：ARM匯編語言程序結(jié)構(gòu)
之四：ARM處理器的尋址方式
之五：ARM指令集與Thumb指令集
之六：NEON指令集與VFP指令集

所謂的原生程序指的是用C/C++編寫的程序，下面來詳細演示一下原生程序是怎么一步步生成匯編代碼的。

這里編譯的是一個簡單的hello.c程序，如下所示：

#include int main(int argc, char* argv[]){printf("Hello ARM!n");return 0;}

一 預(yù)處理

預(yù)處理階段會處理代碼中的預(yù)處理指令,如下所示：

• #include
• #define
• #if

執(zhí)行以下命令進行預(yù)處理，-E可以用來查看詳細輸出。

gcc -E hello.c -o hello.i

成成的hello.i如下所示：

# 1 "hello.c"# 1 ""# 1 ""# 1 "hello.c"# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h" 1# 41 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h"# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/cdefs.h" 1# 59 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/cdefs.h"# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/cdefs_elf.h" 1# 60 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/cdefs.h" 2# 42 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h" 2# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/_types.h" 1# 40 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/_types.h"# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/machine/_types.h" 1# 52 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/machine/_types.h"typedef signed char __int8_t;typedef unsigned char __uint8_t;typedef short __int16_t;typedef unsigned short __uint16_t;typedef int __int32_t;typedef unsigned int __uint32_t;typedef long long __int64_t;typedef unsigned long long __uint64_t;typedef __int8_t __int_least8_t;typedef __uint8_t __uint_least8_t;typedef __int16_t __int_least16_t;typedef __uint16_t __uint_least16_t;typedef __int32_t __int_least32_t;typedef __uint32_t __uint_least32_t;typedef __int64_t __int_least64_t;typedef __uint64_t __uint_least64_t;typedef __int32_t __int_fast8_t;typedef __uint32_t __uint_fast8_t;typedef __int32_t __int_fast16_t;typedef __uint32_t __uint_fast16_t;typedef __int32_t __int_fast32_t;typedef __uint32_t __uint_fast32_t;typedef __int64_t __int_fast64_t;typedef __uint64_t __uint_fast64_t;typedef int __intptr_t;typedef unsigned int __uintptr_t;typedef __int64_t __intmax_t;typedef __uint64_t __uintmax_t;typedef __int32_t __register_t;typedef unsigned long __vaddr_t;typedef unsigned long __paddr_t;typedef unsigned long __vsize_t;typedef unsigned long __psize_t;typedef int __clock_t;typedef int __clockid_t;typedef long __ptrdiff_t;typedef int __time_t;typedef int __timer_t;typedef __builtin_va_list __va_list;typedef int __wchar_t;typedef int __wint_t;typedef int __rune_t;typedef void * __wctrans_t;typedef void * __wctype_t;# 41 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/_types.h" 2typedef unsigned long __cpuid_t;typedef __int32_t __dev_t;typedef __uint32_t __fixpt_t;typedef __uint32_t __gid_t;typedef __uint32_t __id_t;typedef __uint32_t __in_addr_t;typedef __uint16_t __in_port_t;typedef __uint32_t __ino_t;typedef long __key_t;typedef __uint32_t __mode_t;typedef __uint32_t __nlink_t;typedef __int32_t __pid_t;typedef __uint64_t __rlim_t;typedef __uint16_t __sa_family_t;typedef __int32_t __segsz_t;typedef __uint32_t __socklen_t;typedef __int32_t __swblk_t;typedef __uint32_t __uid_t;typedef __uint32_t __useconds_t;typedef __int32_t __suseconds_t;typedef union {char __mbstate8[128];__int64_t __mbstateL;} __mbstate_t;# 43 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h" 2# 1 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stdarg.h" 1 3 4# 40 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stdarg.h" 3 4typedef __builtin_va_list __gnuc_va_list;# 47 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h" 2# 1 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stddef.h" 1 3 4# 211 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stddef.h" 3 4typedef unsigned int size_t;# 51 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h" 2# 1 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stddef.h" 1 3 4# 149 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stddef.h" 3 4typedef int ptrdiff_t;# 323 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stddef.h" 3 4typedef unsigned int wchar_t;# 53 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h" 2# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h" 1# 33 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h"# 1 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stddef.h" 1 3 4# 34 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h" 2# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h" 1# 31 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h"# 1 "c:/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.4.3/include/stddef.h" 1 3 4# 32 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h" 2# 48 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h"typedef __int8_t int8_t;typedef __uint8_t uint8_t;typedef __int16_t int16_t;typedef __uint16_t uint16_t;typedef __int32_t int32_t;typedef __uint32_t uint32_t;typedef __int64_t int64_t;typedef __uint64_t uint64_t;typedef int8_t int_least8_t;typedef int8_t int_fast8_t;typedef uint8_t uint_least8_t;typedef uint8_t uint_fast8_t;# 97 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h"typedef int16_t int_least16_t;typedef int32_t int_fast16_t;typedef uint16_t uint_least16_t;typedef uint32_t uint_fast16_t;# 130 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h"typedef int32_t int_least32_t;typedef int32_t int_fast32_t;typedef uint32_t uint_least32_t;typedef uint32_t uint_fast32_t;# 163 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h"typedef int64_t int_least64_t;typedef int64_t int_fast64_t;typedef uint64_t uint_least64_t;typedef uint64_t uint_fast64_t;# 207 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h"typedef int intptr_t;typedef unsigned int uintptr_t;# 232 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h"typedef uint64_t uintmax_t;typedef int64_t intmax_t;# 268 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdint.h"typedef long int ssize_t;# 35 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h" 2# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/posix_types.h" 1# 15 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/posix_types.h"# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/stddef.h" 1# 15 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/stddef.h"# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/compiler.h" 1# 16 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/stddef.h" 2# 16 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/posix_types.h" 2# 32 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/posix_types.h"typedef struct {unsigned long fds_bits [(1024/(8 * sizeof(unsigned long)))];} __kernel_fd_set;typedef void (*__kernel_sighandler_t)(int);typedef int __kernel_key_t;typedef int __kernel_mqd_t;# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/asm/posix_types.h" 1# 15 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/asm/posix_types.h"typedef unsigned long __kernel_ino_t;typedef unsigned short __kernel_mode_t;typedef unsigned short __kernel_nlink_t;typedef long __kernel_off_t;typedef int __kernel_pid_t;typedef unsigned short __kernel_ipc_pid_t;typedef unsigned short __kernel_uid_t;typedef unsigned short __kernel_gid_t;typedef unsigned int __kernel_size_t;typedef int __kernel_ssize_t;typedef int __kernel_ptrdiff_t;typedef long __kernel_time_t;typedef long __kernel_suseconds_t;typedef long __kernel_clock_t;typedef int __kernel_timer_t;typedef int __kernel_clockid_t;typedef int __kernel_daddr_t;typedef char * __kernel_caddr_t;typedef unsigned short __kernel_uid16_t;typedef unsigned short __kernel_gid16_t;typedef unsigned int __kernel_uid32_t;typedef unsigned int __kernel_gid32_t;typedef unsigned short __kernel_old_uid_t;typedef unsigned short __kernel_old_gid_t;typedef unsigned short __kernel_old_dev_t;typedef long long __kernel_loff_t;typedef struct {int __val[2];} __kernel_fsid_t;# 42 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/posix_types.h" 2# 38 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h" 2# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/asm/types.h" 1# 17 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/asm/types.h"typedef unsigned short umode_t;typedef __signed__ char __s8;typedef unsigned char __u8;typedef __signed__ short __s16;typedef unsigned short __u16;typedef __signed__ int __s32;typedef unsigned int __u32;typedef __signed__ long long __s64;typedef unsigned long long __u64;# 39 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h" 2# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/types.h" 1# 21 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/linux/types.h"typedef __u16 __le16;typedef __u16 __be16;typedef __u32 __le32;typedef __u32 __be32;typedef __u64 __le64;typedef __u64 __be64;struct ustat {__kernel_daddr_t f_tfree;__kernel_ino_t f_tinode;char f_fname[6];char f_fpack[6];};# 40 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h" 2# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/machine/kernel.h" 1# 34 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/machine/kernel.h"typedef unsigned long __kernel_blkcnt_t;typedef unsigned long __kernel_blksize_t;typedef unsigned long __kernel_fsblkcnt_t;typedef unsigned long __kernel_fsfilcnt_t;typedef unsigned int __kernel_id_t;# 41 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h" 2typedef __u32 __kernel_dev_t;# 52 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h"typedef __kernel_blkcnt_t blkcnt_t;typedef __kernel_blksize_t blksize_t;typedef __kernel_clock_t clock_t;typedef __kernel_clockid_t clockid_t;typedef __kernel_dev_t dev_t;typedef __kernel_fsblkcnt_t fsblkcnt_t;typedef __kernel_fsfilcnt_t fsfilcnt_t;typedef __kernel_gid32_t gid_t;typedef __kernel_id_t id_t;typedef __kernel_ino_t ino_t;typedef __kernel_key_t key_t;typedef __kernel_mode_t mode_t;typedef __kernel_nlink_t nlink_t;typedef __kernel_off_t off_t;typedef __kernel_loff_t loff_t;typedef loff_t off64_t;typedef __kernel_pid_t pid_t;# 99 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h"typedef __kernel_suseconds_t suseconds_t;typedef __kernel_time_t time_t;typedef __kernel_uid32_t uid_t;typedef signed long useconds_t;typedef __kernel_daddr_t daddr_t;typedef __kernel_timer_t timer_t;typedef __kernel_mqd_t mqd_t;typedef __kernel_caddr_t caddr_t;typedef unsigned int uint_t;typedef unsigned int uint;# 1 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/sysmacros.h" 1# 36 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/sysmacros.h"static __inline__ int major(dev_t _dev){return (_dev >> 8) & 0xfff;}static __inline__ int minor(dev_t _dev){return (_dev & 0xff) | ((_dev >> 12) & 0xfff00);}static __inline__ dev_t makedev(int __ma, int __mi){return ((__ma & 0xfff) << 8) | (__mi & 0xff) | ((__mi & 0xfff00) << 12);}# 114 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/sys/types.h" 2typedef unsigned char u_char;typedef unsigned short u_short;typedef unsigned int u_int;typedef unsigned long u_long;typedef uint32_t u_int32_t;typedef uint16_t u_int16_t;typedef uint8_t u_int8_t;typedef uint64_t u_int64_t;# 56 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h" 2# 78 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h"typedef off_t fpos_t;# 87 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h"struct __sbuf {unsigned char *_base;int _size;};# 119 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h"typedef struct __sFILE {unsigned char *_p;int _r;int _w;short _flags;short _file;struct __sbuf _bf;int _lbfsize;void *_cookie;int (*_close)(void *);int (*_read)(void *, char *, int);fpos_t (*_seek)(void *, fpos_t, int);int (*_write)(void *, const char *, int);struct __sbuf _ext;unsigned char *_up;int _ur;unsigned char _ubuf[3];unsigned char _nbuf[1];struct __sbuf _lb;int _blksize;fpos_t _offset;} FILE;extern FILE __sF[];# 223 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h"void clearerr(FILE *);int fclose(FILE *);int feof(FILE *);int ferror(FILE *);int fflush(FILE *);int fgetc(FILE *);int fgetpos(FILE *, fpos_t *);char *fgets(char *, int, FILE *);FILE *fopen(const char *, const char *);int fprintf(FILE *, const char *, ...);int fputc(int, FILE *);int fputs(const char *, FILE *);size_t fread(void *, size_t, size_t, FILE *);FILE *freopen(const char *, const char *, FILE *);int fscanf(FILE *, const char *, ...);int fseek(FILE *, long, int);int fseeko(FILE *, off_t, int);int fsetpos(FILE *, const fpos_t *);long ftell(FILE *);off_t ftello(FILE *);size_t fwrite(const void *, size_t, size_t, FILE *);int getc(FILE *);int getchar(void);char *gets(char *);extern int sys_nerr;extern char *sys_errlist[];void perror(const char *);int printf(const char *, ...);int putc(int, FILE *);int putchar(int);int puts(const char *);int remove(const char *);int rename(const char *, const char *);void rewind(FILE *);int scanf(const char *, ...);void setbuf(FILE *, char *);int setvbuf(FILE *, char *, int, size_t);int sprintf(char *, const char *, ...);int sscanf(const char *, const char *, ...);FILE *tmpfile(void);char *tmpnam(char *);int ungetc(int, FILE *);int vfprintf(FILE *, const char *, __va_list);int vprintf(const char *, __va_list);int vsprintf(char *, const char *, __va_list);int snprintf(char *, size_t, const char *, ...)__attribute__((__format__ (printf, 3, 4)))__attribute__((__nonnull__ (3)));int vfscanf(FILE *, const char *, __va_list)__attribute__((__format__ (scanf, 2, 0)))__attribute__((__nonnull__ (2)));int vscanf(const char *, __va_list)__attribute__((__format__ (scanf, 1, 0)))__attribute__((__nonnull__ (1)));int vsnprintf(char *, size_t, const char *, __va_list)__attribute__((__format__ (printf, 3, 0)))__attribute__((__nonnull__ (3)));int vsscanf(const char *, const char *, __va_list)__attribute__((__format__ (scanf, 2, 0)))__attribute__((__nonnull__ (2)));# 302 "c:/android-ndk-r8/platforms/android-14/arch-arm/usr/include/stdio.h"FILE *fdopen(int, const char *);int fileno(FILE *);int pclose(FILE *);FILE *popen(const char *, const char *);void flockfile(FILE *);int ftrylockfile(FILE *);void funlockfile(FILE *);int getc_unlocked(FILE *);int getchar_unlocked(void);int putc_unlocked(int, FILE *);int putchar_unlocked(int);char *tempnam(const char *, const char *);int asprintf(char , const char *, ...)__attribute__((__format__ (printf, 2, 3)))__attribute__((__nonnull__ (2)));char *fgetln(FILE *, size_t *);int fpurge(FILE *);int getw(FILE *);int putw(int, FILE *);void setbuffer(FILE *, char *, int);int setlinebuf(FILE *);int vasprintf(char , const char *, __va_list)__attribute__((__format__ (printf, 2, 0)))__attribute__((__nonnull__ (2)));FILE *funopen(const void *,int (*)(void *, char *, int),int (*)(void *, const char *, int),fpos_t (*)(void *, fpos_t, int),int (*)(void *));int __srget(FILE *);int __swbuf(int, FILE *);static __inline int __sputc(int _c, FILE *_p) {if (--_p->_w >= 0 || (_p->_w >= _p->_lbfsize && (char)_c != n))return (*_p->_p++ = _c);elsereturn (__swbuf(_c, _p));}# 2 "hello.c" 2int main(int argc, char* argv[]){printf("Hello ARM!n");return 0;}

二 編譯

編譯階段編譯器會檢查代碼規(guī)范性，以及是否有語法錯誤等。

執(zhí)行以下命令進行編譯，-S可以用來查看編譯器輸出。

gcc -S hello.i -o hello.s

生成的hello.s文件如下所示：

.arch armv5te.fpu softvfp.eabi_attribute 20, 1.eabi_attribute 21, 1.eabi_attribute 23, 3.eabi_attribute 24, 1.eabi_attribute 25, 1.eabi_attribute 26, 2.eabi_attribute 30, 6.eabi_attribute 18, 4.file   "hello.c".section    .rodata.align  2.LC0:.ascii  "Hello ARM!