xv6-65oo2/initcode.S

# Initial process execs /init.

#include "syscall.h"
#include "traps.h"

# exec(init, argv)
.globl start
start:
  pushl $argv
  pushl $init
  pushl $0  // where caller pc would be
  movl $SYS_exec, %eax
  int $T_SYSCALL

# for(;;) exit();
exit:
  movl $SYS_exit, %eax
  int $T_SYSCALL
  jmp exit

# char init[] = "/init\0";
init:
  .string "/init\0"

# char *argv[] = { init, 0 };
.p2align 2
argv:
  .long init
  .long 0
Various cleanup: - Got rid of dummy proc[0]. Now proc[0] is init. - Added initcode.S to exec /init, so that /init is just a regular binary. - Moved exec out of sysfile to exec.c - Moved code dealing with fs guts (like struct inode) from sysfile.c to fs.c. Code dealing with system call arguments stays in sysfile.c - Refactored directory routines in fs.c; should be simpler. - Changed iget to return unlocked inode structure. This solves the lookup-then-use race in namei without introducing deadlocks. It also enabled getting rid of the dummy proc[0]. 2007-08-21 19:22:08 +00:00			`# Initial process execs /init.`

			`#include "syscall.h"`
			`#include "traps.h"`

			`# exec(init, argv)`
Rename main0 to main. 2007-08-27 23:32:16 +00:00			`.globl start`
Various cleanup: - Got rid of dummy proc[0]. Now proc[0] is init. - Added initcode.S to exec /init, so that /init is just a regular binary. - Moved exec out of sysfile to exec.c - Moved code dealing with fs guts (like struct inode) from sysfile.c to fs.c. Code dealing with system call arguments stays in sysfile.c - Refactored directory routines in fs.c; should be simpler. - Changed iget to return unlocked inode structure. This solves the lookup-then-use race in namei without introducing deadlocks. It also enabled getting rid of the dummy proc[0]. 2007-08-21 19:22:08 +00:00			`start:`
			`pushl $argv`
			`pushl $init`
rearrangements and cleanup for text 2009-07-12 02:26:01 +00:00			`pushl $0 // where caller pc would be`
Various cleanup: - Got rid of dummy proc[0]. Now proc[0] is init. - Added initcode.S to exec /init, so that /init is just a regular binary. - Moved exec out of sysfile to exec.c - Moved code dealing with fs guts (like struct inode) from sysfile.c to fs.c. Code dealing with system call arguments stays in sysfile.c - Refactored directory routines in fs.c; should be simpler. - Changed iget to return unlocked inode structure. This solves the lookup-then-use race in namei without introducing deadlocks. It also enabled getting rid of the dummy proc[0]. 2007-08-21 19:22:08 +00:00			`movl $SYS_exec, %eax`
			`int $T_SYSCALL`

			`# for(;;) exit();`
			`exit:`
			`movl $SYS_exit, %eax`
			`int $T_SYSCALL`
			`jmp exit`

finish comments 2007-08-24 19:37:24 +00:00			`# char init[] = "/init\0";`
Various cleanup: - Got rid of dummy proc[0]. Now proc[0] is init. - Added initcode.S to exec /init, so that /init is just a regular binary. - Moved exec out of sysfile to exec.c - Moved code dealing with fs guts (like struct inode) from sysfile.c to fs.c. Code dealing with system call arguments stays in sysfile.c - Refactored directory routines in fs.c; should be simpler. - Changed iget to return unlocked inode structure. This solves the lookup-then-use race in namei without introducing deadlocks. It also enabled getting rid of the dummy proc[0]. 2007-08-21 19:22:08 +00:00			`init:`
			`.string "/init\0"`

finish comments 2007-08-24 19:37:24 +00:00			`# char *argv[] = { init, 0 };`
Various cleanup: - Got rid of dummy proc[0]. Now proc[0] is init. - Added initcode.S to exec /init, so that /init is just a regular binary. - Moved exec out of sysfile to exec.c - Moved code dealing with fs guts (like struct inode) from sysfile.c to fs.c. Code dealing with system call arguments stays in sysfile.c - Refactored directory routines in fs.c; should be simpler. - Changed iget to return unlocked inode structure. This solves the lookup-then-use race in namei without introducing deadlocks. It also enabled getting rid of the dummy proc[0]. 2007-08-21 19:22:08 +00:00			`.p2align 2`
			`argv:`
			`.long init`
			`.long 0`