so代码：
#include
#include
#include
#include
int GetSum(int a1,int a2) { int sum = a1+a2; return sum; } extern "C" JNIEXPORT jstring JNICALL Java_com_example_myapplication_MainActivity_stringFromJNI( JNIEnv *env, jobject /* this */) { char s[12]; memset(s,0, sizeof(s)); int sum = GetSum(2,5); sprintf(s,"%d",sum); return env->NewStringUTF(s); }
arm汇编:
libnative_lib.so:AEE46872 LDR R4, [R4] ; __stack_chk_guard libnative_lib.so:AEE46874 LDR.W R12, [R4] libnative_lib.so:AEE46878 STR.W R12, [SP,#0x34] libnative_lib.so:AEE4687C STR R0, [SP,#0x24] libnative_lib.so:AEE4687E STR R1, [SP,#0x20] libnative_lib.so:AEE46880 MOVS R0, #0 libnative_lib.so:AEE46882 STR R0, [SP,#0x2C] libnative_lib.so:AEE46884 STR R0, [SP,#0x28] libnative_lib.so:AEE46886 STR R0, [SP,#0x30] //arm传递参数是使用固定寄存器r0-r3 超过使用堆栈方式传入 //与x86汇编不一样，x86使用的是push 传递参数。 libnative_lib.so:AEE46888 MOVS R0, #2 传入参数1为常量2 libnative_lib.so:AEE4688A MOVS R1, #5 //传入参数2为常量5 libnative_lib.so:AEE4688C STR R3, [SP,#0x18] libnative_lib.so:AEE4688E STR R4, [SP,#0x14] libnative_lib.so:AEE46890 STR R2, [SP,#0x10] libnative_lib.so:AEE46892 BLX unk_AEE46764 //调用GetSum 方法 libnative_lib.so:AEE46896 STR R0, [SP,#0x1C] //R0返回值为7 libnative_lib.so:AEE46898 LDR R2, [SP,#0x1C] GetSum方法: libnative_lib.so:AEE46848 ; =============== S U B R O U T I N E ======================================= libnative_lib.so:AEE46848 libnative_lib.so:AEE46848 libnative_lib.so:AEE46848 _Z6GetSumii libnative_lib.so:AEE46848 libnative_lib.so:AEE46848 var_14= -0x14 libnative_lib.so:AEE46848 var_10= -0x10 libnative_lib.so:AEE46848 var_C= -0xC libnative_lib.so:AEE46848 var_8= -8 libnative_lib.so:AEE46848 var_4= -4 libnative_lib.so:AEE46848 libnative_lib.so:AEE46848 SUB SP, SP, #0x14 ; CODE XREF: sub_AEE46764+8↑j libnative_lib.so:AEE46848 libnative_lib.so:off_AEE49FD0↓o libnative_lib.so:AEE4684A MOV R2, R1 libnative_lib.so:AEE4684C MOV R3, R0 libnative_lib.so:AEE4684E STR R0, [SP,#0x14+var_4] //参数1值存入[SP,#0x14+var_4]中 libnative_lib.so:AEE46850 STR R1, [SP,#0x14+var_8]//参数2值存入[SP,#0x14+var_8]中 libnative_lib.so:AEE46852 LDR R0, [SP,#0x14+var_4]//[SP,#0x14+var_4]的值载入到寄存器R0中 值为2 libnative_lib.so:AEE46854 LDR R1, [SP,#0x14+var_8]//[SP,#0x14+var_8]的值载入到寄存器R1中 值为5 libnative_lib.so:AEE46856 ADD R0, R1 //R0+R1 = 7 libnative_lib.so:AEE46858 STR R0, [SP,#0x14+var_C] libnative_lib.so:AEE4685A LDR R0, [SP,#0x14+var_C] //作为返回值存入R0中 libnative_lib.so:AEE4685C STR R2, [SP,#0x14+var_10] libnative_lib.so:AEE4685E STR R3, [SP,#0x14+var_14] libnative_lib.so:AEE46860 ADD SP, SP, #0x14 libnative_lib.so:AEE46862 BX LR libnative_lib.so:AEE46862 ; End of function _Z6GetSumii
IDA动态调试 ,单步跟踪的时候，右边的能看到每个寄存器的值。 
LDR R0, [SP,#0x14+var_4] //在例子中sp的地址值是BE9A3894 = R0= [BE9A3894 +0x14-4]= BE9A38A4 = 2 版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请联系我们举报，一经查实，本站将立刻删除。
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