entry_gcc.S

// See LICENSE for license details

#ifndef ENTRY_S
#define ENTRY_S

#include "encoding.h"
#include "sifive/bits.h"

  .section      .text.entry	
  .align 2
  .global trap_entry
trap_entry:
  addi sp, sp, -32*REGBYTES

  STORE x1, 1*REGBYTES(sp)
  STORE x2, 2*REGBYTES(sp)
  STORE x3, 3*REGBYTES(sp)
  STORE x4, 4*REGBYTES(sp)
  STORE x5, 5*REGBYTES(sp)
  STORE x6, 6*REGBYTES(sp)
  STORE x7, 7*REGBYTES(sp)
  STORE x8, 8*REGBYTES(sp)
  STORE x9, 9*REGBYTES(sp)
  STORE x10, 10*REGBYTES(sp)
  STORE x11, 11*REGBYTES(sp)
  STORE x12, 12*REGBYTES(sp)
  STORE x13, 13*REGBYTES(sp)
  STORE x14, 14*REGBYTES(sp)
  STORE x15, 15*REGBYTES(sp)
  STORE x16, 16*REGBYTES(sp)
  STORE x17, 17*REGBYTES(sp)
  STORE x18, 18*REGBYTES(sp)
  STORE x19, 19*REGBYTES(sp)
  STORE x20, 20*REGBYTES(sp)
  STORE x21, 21*REGBYTES(sp)
  STORE x22, 22*REGBYTES(sp)
  STORE x23, 23*REGBYTES(sp)
  STORE x24, 24*REGBYTES(sp)
  STORE x25, 25*REGBYTES(sp)
  STORE x26, 26*REGBYTES(sp)
  STORE x27, 27*REGBYTES(sp)
  STORE x28, 28*REGBYTES(sp)
  STORE x29, 29*REGBYTES(sp)
  STORE x30, 30*REGBYTES(sp)
  STORE x31, 31*REGBYTES(sp)

  csrr a0, mcause
  csrr a1, mepc
  mv a2, sp
  call handle_trap
  csrw mepc, a0

  # Remain in M-mode after mret
  li t0, MSTATUS_MPP
  csrs mstatus, t0

  LOAD x1, 1*REGBYTES(sp)
  LOAD x2, 2*REGBYTES(sp)
  LOAD x3, 3*REGBYTES(sp)
  LOAD x4, 4*REGBYTES(sp)
  LOAD x5, 5*REGBYTES(sp)
  LOAD x6, 6*REGBYTES(sp)
  LOAD x7, 7*REGBYTES(sp)
  LOAD x8, 8*REGBYTES(sp)
  LOAD x9, 9*REGBYTES(sp)
  LOAD x10, 10*REGBYTES(sp)
  LOAD x11, 11*REGBYTES(sp)
  LOAD x12, 12*REGBYTES(sp)
  LOAD x13, 13*REGBYTES(sp)
  LOAD x14, 14*REGBYTES(sp)
  LOAD x15, 15*REGBYTES(sp)
  LOAD x16, 16*REGBYTES(sp)
  LOAD x17, 17*REGBYTES(sp)
  LOAD x18, 18*REGBYTES(sp)
  LOAD x19, 19*REGBYTES(sp)
  LOAD x20, 20*REGBYTES(sp)
  LOAD x21, 21*REGBYTES(sp)
  LOAD x22, 22*REGBYTES(sp)
  LOAD x23, 23*REGBYTES(sp)
  LOAD x24, 24*REGBYTES(sp)
  LOAD x25, 25*REGBYTES(sp)
  LOAD x26, 26*REGBYTES(sp)
  LOAD x27, 27*REGBYTES(sp)
  LOAD x28, 28*REGBYTES(sp)
  LOAD x29, 29*REGBYTES(sp)
  LOAD x30, 30*REGBYTES(sp)
  LOAD x31, 31*REGBYTES(sp)

  addi sp, sp, 32*REGBYTES
  mret

.weak handle_trap
handle_trap:
1:
  j 1b
	
#endif