xv6

port of xv6 to x86-64
git clone http://frotz.net/git/xv6.git
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initcode.S (423B)

      1 # Initial process execs /init.
      2 
      3 #include "syscall.h"
      4 #include "traps.h"
      5 
      6 
      7 # exec(init, argv)
      8 .globl start
      9 start:
     10   pushl $argv
     11   pushl $init
     12   pushl $0  // where caller pc would be
     13   movl $SYS_exec, %eax
     14   int $T_SYSCALL
     15 
     16 # for(;;) exit();
     17 exit:
     18   movl $SYS_exit, %eax
     19   int $T_SYSCALL
     20   jmp exit
     21 
     22 # char init[] = "/init\0";
     23 init:
     24   .string "/init\0"
     25 
     26 # char *argv[] = { init, 0 };
     27 .p2align 2
     28 argv:
     29   .long init
     30   .long 0
     31