libgloss/mcore/syscalls.S

   1 .macro FUNC_START name
   2         .text
   3         .globl \name
   4         .globl _\name
   5 \name:
   6 _\name:
   7 .endm
   8
   9 FUNC_START _sbrk
  10         mov     r4, r2                  // save increment
  11         lrw     r3, brkval
  12         ldw     r2, (r3)                // get next spot
  13
  14         movi    r5, 7
  15         addi    r2, 7                   // round up to 8 bytes
  16         andn    r2, r5
  17
  18         addu    r4, r2                  // save updated pointer
  19         stw     r4, (r3)
  20         jmp     r15
  21
  22 // brk() could go in here too...
  23
  24         .data
  25         .import _end
  26 brkval: .long   _end
  27
  28
  29 FUNC_START _exit
  30         mov     r1, r1          // accomodate simulator glitch...
  31         .short  0x5000
  32         br      _exit           // hard loop here
  33
  34 // 0x5001 - printf
  35 // 0x5002 - scanf
  36
  37 FUNC_START utime
  38         .short  0x5003
  39         jmp     r15
  40
  41
  42 .macro stub name value
  43 FUNC_START \name
  44         movi    r1, \value
  45         .short  0x50FF
  46         jmp     r15
  47 .endm
  48
  49 stub _close   6
  50 stub _lseek  19
  51 stub _open    5
  52 stub _read    3
  53 stub _times  43
  54 stub _unlink 10
  55 stub _write   4
  56
  57 //stub access  33
  58 //stub creat    8
  59 //stub link     9
  60 //stub time    13
  61
  62 //stub profil 98  // movi r6, 2
  63 //stub lprofil 98 // movi r6, 4
  64