How can I put Intel asm code into my c++ application? I'm using Dev-C++.
I want to do sth like that:
int temp = 0;
int usernb = 3;
pusha
mov eax, temp
inc eax
xor usernb, usernb
mov eax, usernb
popa
This is only example. How can I do sth like that?
UPDATE: How does it look in Visual Studio ?
You can find a complete howto here http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html
#include <stdlib.h>
int main()
{
int temp = 0;
int usernb = 3;
__asm__ volatile (
"pusha \n"
"mov eax, %0 \n"
"inc eax \n"
"mov ecx, %1 \n"
"xor ecx, %1 \n"
"mov %1, ecx \n"
"mov eax, %1 \n"
"popa \n"
: // no output
: "m" (temp), "m" (usernb) ); // input
exit(0);
}
After that you need to compile with something like:
gcc -m32 -std=c99 -Wall -Wextra -masm=intel -o casm casmt.c && ./casm && echo $?
output:
0
You need to compile with the -masm=intel flag since you want intel assembly syntax :)
Here's a simple example to show the syntax for GCC/Dev-C++:
int main(void)
{
int x = 10, y;
asm ("movl %1, %%eax;"
"movl %%eax, %0;"
:"=r"(y) /* y is output operand */
:"r"(x) /* x is input operand */
:"%eax"); /* %eax is clobbered register */
}
It depends on your compiler. But from your tags I guess you use gcc/g++ then you can use gcc inline assembler . But the syntax is quite weird and a bit different from intel syntax, although it achieves the same.
EDIT: With Visual Studio (or the Visual C++ compiler) it get's much easier, as it uses the usual Intel syntax.
UPDATE: How does it look in Visual Studio ?
If you are building for 64 bit, you cannot use inline assembly in Visual Studio. If you are building for 32 bit, then you use __asm
to do the embedding.
Generally, using inline ASM is a bad idea.
If it's for some exercices I'd recommend some real assembler avoiding inlined code as it can get rather messy/confusing.
Some basics using GCC can be found here .
If you're open to trying MSVC (not sure if GCC is a requirement), I'd suggest you have a look at MSVC's interpretation which is (in my opinion) a lot easier to read/understand, especially for learning assembler. An example can be found here .
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.