disassemble your code @ objdump ....

除了用 gcc -S 來產生 *.s 的 assembly code之外. 也可以用 objdump + strace 的 command 來做 assemble && system call trace. sample code @ c

TT *get_TTNode(TT *p,int Id){
    TT *tPtr = p;

    while(tPtr!=NULL){
      if( tPtr->Id == Id ){
           return tPtr; break;
      }
      tPtr = tPtr->Nxt;
   }

return NULL;
}

objdump -d (disassemble)

080484d3 <get_TTNode>:
 80484d3:       55                      push   %ebp
 80484d4:       89 e5                   mov    %esp,%ebp                        // store current stack pointer
 80484d6:       83 ec 14                sub    $0x14,%esp
 80484d9:       8b 45 08                mov    0x8(%ebp),%eax                   // get "TT *p"
 80484dc:       89 45 fc                mov    %eax,-0x4(%ebp)                  // "TT *tPtr = p"
 80484df:       eb 1b                   jmp    80484fc <get_TTNode+0x29>  // jump to while loop 
 80484e1:       8b 45 fc                mov    -0x4(%ebp),%eax                  // "tPtr->Id"
 80484e4:       8b 00                   mov    (%eax),%eax                      // mov to eax register
 80484e6:       3b 45 0c                cmp    0xc(%ebp),%eax                   // cmp (tPtr->Id == Id )? true : false;
 80484e9:       75 08                   jne    80484f3 <get_TTNode+0x20>
 80484eb:       8b 45 fc                mov    -0x4(%ebp),%eax                  
 80484ee:       89 45 ec                mov    %eax,-0x14(%ebp)                 // return tPtr
 80484f1:       eb 16                   jmp    8048509 <get_TTNode+0x36>  // break
 80484f3:       8b 45 fc                mov    -0x4(%ebp),%eax
 80484f6:       8b 40 0c                mov    0xc(%eax),%eax                   // tPtr = tPtr->Nxt
 80484f9:       89 45 fc                mov    %eax,-0x4(%ebp)
 80484fc:       83 7d fc 00             cmpl   $0x0,-0x4(%ebp)                  // while loop
 8048500:       75 df                   jne    80484e1 <get_TTNode+0xe>           // cmp (tPtr!=NULL)? true : false;
 8048502:       c7 45 ec 00 00 00 00    movl   $0x0,-0x14(%ebp)
 8048509:       8b 45 ec                mov    -0x14(%ebp),%eax                 //return NULL
 804850c:       c9                      leave  
 804850d:       c3                      ret 

Refs : objdump strace