在網(wǎng)上找到了一個這樣的例子，是Larry Bank寫的。貼出來以供大家學(xué)習(xí)。讓大家了解ARM匯編指令，并用vs2005進(jìn)行調(diào)試跟蹤。
工程是pocket pc 2003的工程，主要包含兩個文件:main.c, armtest.asm。
對armtest.asm需要自定義編譯選項，
命令行為 armasm -g armtest.asm
輸出為 armtest.obj
源碼如下：
main.c 源碼
// Windows CE Sample Application
// Demonstrations how to use ARM assembly language within a C program
// Written by Larry Bank 3/25/2007
#include <windows.h>
int iGlobal;
int ARMTEST1(int, int, int , int);
/****************************************************************************
* FUNCTION : WinMain(HANDLE, HANDLE, LPSTR, int) *
*
PURPOSE : Program
entrypoint
*
****************************************************************************/
int APIENTRY WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow)
{
int iResult;
TCHAR szTemp[256];
iGlobal = 5;
iResult = ARMTEST1(1,2,3,4);
wsprintf(szTemp, L"Result = %d", iResult);
MessageBox(HWND_DESKTOP, szTemp, L"ASM Result", MB_OK);
return 0;
} /* WinMain() */
armtest.asm 源碼：
; TITLE("Sample App")
;++
AREA sample, CODE, READONLY ; name this block of code
EXPORT ARMTEST1
IMPORT iGlobal
; Called from C as int ARMTEST1(int, int, int, int);
; The first 4 parameters are passed in r0-r3, more parameters would be passed on the stack
ARMTEST1 proc
add r0,r0,r1 ; add all of the inputs together
add r0,r0,r2
add r0,r0,r3
ldr r1,=iGlobal ; get the value of our global variable
ldr r1,[r1] ; dereference the pointer (I know there's a pipe stall here)
add r0,r0,r1 ; we're not concerned with performance in this example
mov pc,lr ; return to C with the value in R0
endp
LTORG ; allow room for the address constant of our global (loaded relative to PC)
END