Hello World

/*TinyHelloWorld.c    */

  1 char * str = "Hello world!\n";                                                                             
      2
      3 void print()
      4 {
      5     asm( "movl $13, %%edx \n\t"
      6          "movl %0, %%ecx \n\t"
      7          "movl $0, %%ebx \n\t"
      8          "movl $4, %%eax \n\t"
      9          "int $0x80      \n\t"
     10          ::"r"(str):"edx", "ecx", "ebx");
     11 }
     12
     13 void exit()
     14 {
     15     asm("movl $42, %ebx \n\t"
     16         "movl $1, %eax  \n\t"
     17         "int $0x80      \n\t");
     18 }
     19
     20 void nomain()
     21 {
     22     print();
     23     exit();
     24 }

/*TinyHelloWorld.lds*/

      1 ENTRY(nomain)                                                                                              
      2
      3 SECTIONS
      4 {
      5     . = 0X08408000 + SIZEOF_HEADERS;
      6
      7     tinytext : { *(.text) *(.data) *(.rodata) }
      8
      9     /DISCARD/ : { *(.comment) }
     10 }

 

      1 /*fisrt*/
      2 gcc -c -fno-builtin TinyHelloWorld.c
      3
      4 ld -static -e nomain -o TinyHelloWorld TinyHelloWorld.o
      5
      6 /*second*/
      7 gcc -c -fno-builtin TinyHelloWorld.c
      8
      9 ld -static -T TinyHelloWorld.lds -o TinyHelloWorld TinyHelloWorld.o
     10
     11 /*third*/
     12 gcc -c -fno-builtin TinyHelloWorld.c
     13
     14 ld -s -static -T TinyHelloWorld.lds -o TinyHelloWorld TinyHelloWorld.o