[Bug gas/13903] fails an external calling in "C" programm by inline assembler (Core i5 x86_64)

[kdiman1982 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13903

kdiman <kdiman1982 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64-pc-linux-gnu
               Host|                            |x86_64-pc-linux-gnu

--- Comment #1 from kdiman <kdiman1982 at gmail dot com> 2012-03-26 18:18:54 
UTC ---
+++++++++++++++THIS CODE IS OK (32 bit)++++++++++++++++++
#include <stdio.h>

// g++ -m32 call32.c -o call32 && ./call32
int main(){

 void *p_printf = (void *)&printf;
 const char *str = "Hello from inline assembler is GNU Assembler\n";

 printf("address of printf: %p\n", p_printf); // 0x8048374

asm ("movl %0, %%edx;" /* str into EDX */
  "movl %1, %%ecx;" /* PRINTF into ECX */
  "pushl %%edx;" /* str into stack */
    "call *%%ecx;" /* call "printf" */
    "popl %%edx;" /* remove arg from stack */
  :  /* output */
  :"r"(str),"r"(p_printf)         /* input */
  :"%edx", "%ecx"         /* clobbered register */
 );  

return 0;
}
+++++++++++++++THIS CODE IS OK (32 bit)++++++++++++++++++



+++++++++++++++FAILS CODE (64 bit)+++++++++++++++
#include <stdio.h>

// g++ -m64 call64.c -o call64 && ./call64
int main(){

 void *p_printf = (void *)&printf;
 const char *str = "Hello from inline assembler is GNU Assembler\n";

 printf("address of printf: %p\n", p_printf); // 0x400490

asm ("movq %0, %%rdx;" /* str into RDX */
  "movq %1, %%rcx;" /* PRINTF into RCX */
  "pushq %%rdx;" /* str into stack */
    "call *%%rcx;" /* call "printf" */
    "popq %%rdx;" /* remove arg from stack */
  :  /* output */
  :"r"(str),"r"(p_printf)         /* input */
  :"%rdx", "%rcx"         /* clobbered register */
 );  

return 0;
}
+++++++++++++++FAILS CODE (64 bit)+++++++++++++++

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