--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/uprogs/usys.S	Sun Jan 06 19:27:03 2019 +0900
@@ -0,0 +1,374 @@
+/*****************************************************************
+*       usys.S
+*       by Zhiyi Huang, hzy@cs.otago.ac.nz
+*       University of Otago
+*
+********************************************************************/
+
+
+
+#include "syscall.h"
+#include "traps.h"
+
+/* This is clumsy, but don't know how to make it smart */
+.globl fork
+fork:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_fork  
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl exit
+exit:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_exit
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl wait
+wait:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_wait
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl pipe
+pipe:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_pipe
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl read
+read:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_read
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl write
+write:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_write
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl close
+close:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_close
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+
+.globl kill
+kill:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_kill
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl exec
+exec:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_exec
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl open
+open:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_open
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl mknod
+mknod:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_mknod
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl unlink
+unlink:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_unlink
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl fstat
+fstat:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_fstat
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl link
+link:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_link
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl mkdir
+mkdir:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_mkdir
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl chdir
+chdir:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_chdir
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl dup
+dup:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_dup
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl getpid
+getpid:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_getpid
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl sbrk
+sbrk:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_sbrk
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl sleep
+sleep:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_sleep
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+.globl uptime
+uptime:
+    push {lr}
+    push {r3}
+    push {r2}
+    push {r1}
+    push {r0}
+    mov r0, #SYS_uptime
+    swi #T_SYSCALL
+    pop {r1} /* to avoid overwrite of r0 */
+    pop {r1}
+    pop {r2}
+    pop {r3}
+    pop {lr}
+    bx lr
+
+
+/*
+SYSCALL(fork)
+SYSCALL(exit)
+SYSCALL(wait)
+SYSCALL(pipe)
+SYSCALL(read)
+SYSCALL(write)
+SYSCALL(close)
+SYSCALL(kill)
+SYSCALL(exec)
+SYSCALL(open)
+SYSCALL(mknod)
+SYSCALL(unlink)
+SYSCALL(fstat)
+SYSCALL(link)
+SYSCALL(mkdir)
+SYSCALL(chdir)
+SYSCALL(dup)
+SYSCALL(getpid)
+SYSCALL(sbrk)
+SYSCALL(sleep)
+SYSCALL(uptime)
+*/