Using ARM inline assembly, how can I ask gcc to put a variable into a designated register?
LiMing
myfavor_linux at msn.com
Thu Feb 11 03:01:56 EST 2010
Dear all,
Using ARM inline assembly, how can I ask gcc to put a variable into a designated register?
For example: on X86 architechure,
int foo(int x, int y)
{
int z = x + y;
printf("foo: x = %d y= %d\n ", x, y);
return z;
}
void call_foo(void)
{
int result;
int arg1 =1, arg2=2;
asm("foo" : "=r"(result) : "a"(arg1),"d"(arg2));
printf("call_foo result = %d\n",result);
}
In function call_foo, gcc will put arg1 into eax and arg2 into edx.
On ARM architechure, How can I ask arm gcc to put arg1 into r0 and arg2 into r1?
please help me what to do.
Regards,
Ming
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