mt/common/crt.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   # only allow core 0 to proceed
  96 1:mfpcr a0, cr10
  97   bnez a0, 1b
  98
  99   la  sp,stacktop
 100   jal main
 101 1:b 1b
 102
 103   .bss
 104   .globl stacktop
 105
 106   .align 4
 107   .skip 131072
 108 stacktop: