riscv/processor.cc

   1 #include <bfd.h>
   2 #include <dis-asm.h>
   3 #include <cstdlib>
   4 #include <iostream>
   5 #include "processor.h"
   6 #include "common.h"
   7 #include "config.h"
   8 #include "sim.h"
   9
  10 processor_t::processor_t(sim_t* _sim, char* _mem, size_t _memsz)
  11   : sim(_sim), mmu(_mem,_memsz)
  12 {
  13   memset(R,0,sizeof(R));
  14   pc = 0;
  15   ebase = 0;
  16   epc = 0;
  17   badvaddr = 0;
  18   set_sr(SR_S);
  19
  20   memset(counters,0,sizeof(counters));
  21 }
  22
  23 void processor_t::init(uint32_t _id)
  24 {
  25   id = _id;
  26 }
  27
  28 void processor_t::set_sr(uint32_t val)
  29 {
  30   sr = val & ~SR_ZERO;
  31   if(support_64bit)
  32     sr |= SR_KX;
  33   else
  34     sr &= ~(SR_KX | SR_UX);
  35
  36   gprlen = ((sr & SR_S) ? (sr & SR_KX) : (sr & SR_UX)) ? 64 : 32;
  37 }
  38
  39 void processor_t::step(size_t n, bool noisy)
  40 {
  41   size_t i = 0;
  42   while(1) try
  43   {
  44     for( ; i < n; i++)
  45     {
  46       insn_t insn = mmu.load_insn(pc);
  47
  48       int opcode = insn.rtype.opcode;
  49       int funct = insn.rtype.funct;
  50       reg_t npc = pc+sizeof(insn);
  51
  52       if(noisy)
  53         disasm(insn,pc);
  54
  55       #include "execute.h"
  56
  57       pc = npc;
  58       R[0] = 0;
  59
  60       counters[0]++;
  61     }
  62     return;
  63   }
  64   catch(trap_t t)
  65   {
  66     i++;
  67     take_trap(t);
  68   }
  69 }
  70
  71 void processor_t::take_trap(trap_t t)
  72 {
  73   demand(t < NUM_TRAPS, "internal error: bad trap number %d", int(t));
  74   demand(sr & SR_ET, "error mode on core %d!\ntrap %s, pc 0x%016llx",
  75          id, trap_name(t), (unsigned long long)pc);
  76
  77   set_sr((((sr & ~SR_ET) | SR_S) & ~SR_PS) | ((sr & SR_S) ? SR_PS : 0));
  78   epc = pc;
  79   pc = ebase + t*128;
  80   badvaddr = mmu.get_badvaddr();
  81 }
  82
  83 void processor_t::disasm(insn_t insn, reg_t pc)
  84 {
  85   printf("core %3d: 0x%016llx (0x%08x) ",id,(unsigned long long)pc,insn.bits);
  86
  87   #ifdef RISCV_HAVE_LIBOPCODES
  88   disassemble_info info;
  89   INIT_DISASSEMBLE_INFO(info, stdout, fprintf);
  90   info.flavour = bfd_target_unknown_flavour;
  91   info.arch = bfd_arch_mips;
  92   info.mach = 101; // XXX bfd_mach_mips_riscv requires modified bfd.h
  93   info.endian = BFD_ENDIAN_LITTLE;
  94   info.buffer = (bfd_byte*)&insn;
  95   info.buffer_length = sizeof(insn);
  96   info.buffer_vma = pc;
  97
  98   demand(print_insn_little_mips(pc, &info) == sizeof(insn), "disasm bug!");
  99   #else
 100   printf("unknown");
 101   #endif
 102   printf("\n");
 103 }