UNIX 7th Ed. - /usr/src/libc/sys/read.s

   1: / C library -- read
   2: 
   3: / nread = read(file, buffer, count);
   4: / nread ==0 means eof; nread == -1 means error
   5: 
   6: .globl  _read
   7: .globl  cerror
   8: .read = 3.
   9: 
  10: _read:
  11:         mov     r5,-(sp)
  12:         mov     sp,r5
  13:         mov     4(r5),r0
  14:         mov     6(r5),0f
  15:         mov     8(r5),0f+2
  16:         sys     0; 9f
  17:         bec     1f
  18:         jmp     cerror
  19: 1:
  20:         mov     (sp)+,r5
  21:         rts     pc
  22: .data
  23: 9:
  24:         sys     .read; 0:..; ..

Defined functions