benchmarks/common/crt.S

   1 #include "encoding.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   li a0, SR_U64 | SR_S64
  49   csrs status, a0
  50 #endif
  51
  52   # enable fp and accelerator
  53   li a0, SR_EF | SR_EA
  54   csrs status, a0
  55
  56   ## if that didn't stick, we don't have an FPU, so don't initialize it
  57   csrr t0, status
  58   and t0, t0, SR_EF
  59   beqz t0, 1f
  60
  61   fssr    x0
  62   fmv.s.x f0, x0
  63   fmv.s.x f1, x0
  64   fmv.s.x f2, x0
  65   fmv.s.x f3, x0
  66   fmv.s.x f4, x0
  67   fmv.s.x f5, x0
  68   fmv.s.x f6, x0
  69   fmv.s.x f7, x0
  70   fmv.s.x f8, x0
  71   fmv.s.x f9, x0
  72   fmv.s.x f10,x0
  73   fmv.s.x f11,x0
  74   fmv.s.x f12,x0
  75   fmv.s.x f13,x0
  76   fmv.s.x f14,x0
  77   fmv.s.x f15,x0
  78   fmv.s.x f16,x0
  79   fmv.s.x f17,x0
  80   fmv.s.x f18,x0
  81   fmv.s.x f19,x0
  82   fmv.s.x f20,x0
  83   fmv.s.x f21,x0
  84   fmv.s.x f22,x0
  85   fmv.s.x f23,x0
  86   fmv.s.x f24,x0
  87   fmv.s.x f25,x0
  88   fmv.s.x f26,x0
  89   fmv.s.x f27,x0
  90   fmv.s.x f28,x0
  91   fmv.s.x f29,x0
  92   fmv.s.x f30,x0
  93   fmv.s.x f31,x0
  94 1:
  95
  96   lui a0, %hi(trap_entry)
  97   add a0, a0, %lo(trap_entry)
  98   csrw evec, a0
  99
 100   lui a0, %hi(main)
 101   add a0, a0, %lo(main)
 102   csrw epc, a0
 103
 104   # only allow core 0 to proceed
 105 1:csrr a0, hartid
 106   bnez a0, 1b
 107
 108   la  sp,stacktop
 109
 110   # jmp to main as a user program
 111   sret
 112 1:b 1b
 113
 114 .align 4
 115 .globl trap_entry
 116 trap_entry:                # only check for SYS_exit, otherwise crash out
 117   li a3, 1337              # magic "bad things" happened error code
 118   csrr a1, cause
 119   li a2, 6                 # syscall exception number
 120   bne a1, a2, exit_error
 121 handle_syscall:
 122   li a1, 93                # SYS_exit number
 123   bne v0, a1, exit_error
 124   li a1, 1                 # successful exit code
 125   move a3, a0
 126   bne a3, a1, exit_error
 127   csrw tohost, a1          # exit successfully (tohost == 1)
 128 1:b 1b
 129 exit_error:
 130   sll a3, a3, 1
 131   or  a3, a3, 1
 132   csrw tohost, a3
 133 1:b 1b
 134
 135   .bss
 136   .globl stacktop
 137
 138   .align 4
 139   .skip 131072
 140 stacktop: