mt/common/crt-mt.S

   1   .data
   2   .globl _heapend
   3   .globl environ
   4 _heapend:
   5   .word 0
   6 environ:
   7   .word 0
   8
   9   .text
  10   .globl _start
  11
  12 _start:
  13   li  x1, 0
  14   li  x2, 0
  15   li  x3, 0
  16   li  x4, 0
  17   li  x5, 0
  18   li  x6, 0
  19   li  x7, 0
  20   li  x8, 0
  21   li  x9, 0
  22   li  x10,0
  23   li  x11,0
  24   li  x12,0
  25   li  x13,0
  26   li  x14,0
  27   li  x15,0
  28   li  x16,0
  29   li  x17,0
  30   li  x18,0
  31   li  x19,0
  32   li  x20,0
  33   li  x21,0
  34   li  x22,0
  35   li  x23,0
  36   li  x24,0
  37   li  x25,0
  38   li  x26,0
  39   li  x27,0
  40   li  x28,0
  41   li  x29,0
  42   li  x30,0
  43   li  x31,0
  44
  45   # enable fp
  46   mfpcr  x1,cr0
  47   ori  x1,x1,0x2
  48   mtpcr  x1,cr0
  49
  50   # enable vec
  51   mfpcr  x1,cr0
  52   ori  x1,x1,0x4
  53   mtpcr  x1,cr0
  54
  55   ## if that didn't stick, we don't have an FPU, so don't initialize it
  56   mfpcr x1,cr0
  57   andi x1,x1,0x2
  58   beqz x1,1f
  59
  60   mtfsr   x0
  61   mxtf.s  f0, x0
  62   mxtf.s  f1, x0
  63   mxtf.s  f2, x0
  64   mxtf.s  f3, x0
  65   mxtf.s  f4, x0
  66   mxtf.s  f5, x0
  67   mxtf.s  f6, x0
  68   mxtf.s  f7, x0
  69   mxtf.s  f8, x0
  70   mxtf.s  f9, x0
  71   mxtf.s  f10,x0
  72   mxtf.s  f11,x0
  73   mxtf.s  f12,x0
  74   mxtf.s  f13,x0
  75   mxtf.s  f14,x0
  76   mxtf.s  f15,x0
  77   mxtf.s  f16,x0
  78   mxtf.s  f17,x0
  79   mxtf.s  f18,x0
  80   mxtf.s  f19,x0
  81   mxtf.s  f20,x0
  82   mxtf.s  f21,x0
  83   mxtf.s  f22,x0
  84   mxtf.s  f23,x0
  85   mxtf.s  f24,x0
  86   mxtf.s  f25,x0
  87   mxtf.s  f26,x0
  88   mxtf.s  f27,x0
  89   mxtf.s  f28,x0
  90   mxtf.s  f29,x0
  91   mxtf.s  f30,x0
  92   mxtf.s  f31,x0
  93 1:
  94
  95   # get core id and number of cores
  96   mfpcr a0,cr10
  97   lw a1, 4(zero)
  98
  99   slli a2, a0, 13
 100   la sp, stacktop
 101   sub sp, sp, a2
 102
 103   la tp, tlstop
 104   sub tp, tp, a2
 105
 106   jal thread_entry
 107
 108   .bss
 109   .globl stacktop
 110   .globl tlstop
 111
 112   .align 4
 113   .skip 32768
 114 stacktop:
 115   .skip 65536
 116 tlstop: