benchmarks/common/crt.S

   1 #include "pcr.h"
   2
   3   .data
   4   .globl _heapend
   5   .globl environ
   6 _heapend:
   7   .word 0
   8 environ:
   9   .word 0
  10
  11   .text
  12   .globl _start
  13
  14 _start:
  15   li  x1, 0
  16   li  x2, 0
  17   li  x3, 0
  18   li  x4, 0
  19   li  x5, 0
  20   li  x6, 0
  21   li  x7, 0
  22   li  x8, 0
  23   li  x9, 0
  24   li  x10,0
  25   li  x11,0
  26   li  x12,0
  27   li  x13,0
  28   li  x14,0
  29   li  x15,0
  30   li  x16,0
  31   li  x17,0
  32   li  x18,0
  33   li  x19,0
  34   li  x20,0
  35   li  x21,0
  36   li  x22,0
  37   li  x23,0
  38   li  x24,0
  39   li  x25,0
  40   li  x26,0
  41   li  x27,0
  42   li  x28,0
  43   li  x29,0
  44   li  x30,0
  45   li  x31,0
  46
  47 #ifdef __riscv64
  48   setpcr status, SR_S64
  49   setpcr status, SR_U64
  50 #endif
  51
  52   # enable fp
  53   setpcr status, SR_EF
  54
  55   # enable vec
  56   setpcr t0, status, SR_EV
  57
  58   ## if that didn't stick, we don't have an FPU, so don't initialize it
  59   and t0, t0, SR_EF
  60   beqz t0, 1f
  61
  62   fssr    x0
  63   fmv.s.x f0, x0
  64   fmv.s.x f1, x0
  65   fmv.s.x f2, x0
  66   fmv.s.x f3, x0
  67   fmv.s.x f4, x0
  68   fmv.s.x f5, x0
  69   fmv.s.x f6, x0
  70   fmv.s.x f7, x0
  71   fmv.s.x f8, x0
  72   fmv.s.x f9, x0
  73   fmv.s.x f10,x0
  74   fmv.s.x f11,x0
  75   fmv.s.x f12,x0
  76   fmv.s.x f13,x0
  77   fmv.s.x f14,x0
  78   fmv.s.x f15,x0
  79   fmv.s.x f16,x0
  80   fmv.s.x f17,x0
  81   fmv.s.x f18,x0
  82   fmv.s.x f19,x0
  83   fmv.s.x f20,x0
  84   fmv.s.x f21,x0
  85   fmv.s.x f22,x0
  86   fmv.s.x f23,x0
  87   fmv.s.x f24,x0
  88   fmv.s.x f25,x0
  89   fmv.s.x f26,x0
  90   fmv.s.x f27,x0
  91   fmv.s.x f28,x0
  92   fmv.s.x f29,x0
  93   fmv.s.x f30,x0
  94   fmv.s.x f31,x0
  95 1:
  96
  97   lui a0, %hi(trap_entry)
  98   add a0, a0, %lo(trap_entry)
  99   mtpcr a0, evec
 100
 101   lui a0, %hi(main)
 102   add a0, a0, %lo(main)
 103   mtpcr a0, epc
 104
 105   # only allow core 0 to proceed
 106 1:mfpcr a0, hartid
 107   bnez a0, 1b
 108
 109   la  sp,stacktop
 110
 111   # jmp to main as a user program
 112   eret
 113 1:b 1b
 114
 115 .align 4
 116 .globl trap_entry
 117 trap_entry:                # only check for SYS_exit, otherwise crash out
 118   li a3, 1337              # magic "bad things" happened error code
 119   mfpcr a1, cause
 120   li a2, 6                 # syscall exception number
 121   bne a1, a2, exit_error
 122 handle_syscall:
 123   li a1, 93                # SYS_exit number
 124   bne v0, a1, exit_error
 125   li a1, 1                 # successful exit code
 126   move a3, a0
 127   bne a3, a1, exit_error
 128   mtpcr a1, tohost         # exit successfully (tohost == 1)
 129 1:b 1b
 130 exit_error:
 131   sll a3, a3, 1
 132   or  a3, a3, 1
 133   mtpcr a3, tohost
 134 1:b 1b
 135
 136   .bss
 137   .globl stacktop
 138
 139   .align 4
 140   .skip 131072
 141 stacktop: