VEX/priv/guest_nanomips_helpers.c

   1
   2 /*---------------------------------------------------------------*/
   3 /*--- begin                          guest_nanomips_helpers.c ---*/
   4 /*---------------------------------------------------------------*/
   5
   6 /*
   7    This file is part of Valgrind, a dynamic binary instrumentation
   8    framework.
   9
  10    Copyright (C) 2017-2018 RT-RK
  11
  12    This program is free software; you can redistribute it and/or
  13    modify it under the terms of the GNU General Public License as
  14    published by the Free Software Foundation; either version 2 of the
  15    License, or (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful, but
  18    WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  25    02111-1307, USA.
  26
  27    The GNU General Public License is contained in the file COPYING.
  28 */
  29
  30 #include "libvex_basictypes.h"
  31 #include "libvex_emnote.h"
  32 #include "libvex_guest_mips32.h"
  33 #include "libvex_ir.h"
  34 #include "libvex.h"
  35
  36 #include "main_util.h"
  37 #include "main_globals.h"
  38 #include "guest_generic_bb_to_IR.h"
  39 #include "guest_nanomips_defs.h"
  40
  41 #if defined (__GNUC__)
  42 #define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
  43 #else
  44 #define GCC_VERSION 0
  45 #endif
  46
  47 /* This file contains helper functions for mips guest code.  Calls to
  48    these functions are generated by the back end.
  49 */
  50
  51 #define ALWAYSDEFD32(field)                            \
  52     { offsetof(VexGuestMIPS32State, field),            \
  53       (sizeof ((VexGuestMIPS32State*)0)->field) }
  54
  55 VexGuestLayout nanomipsGuest_layout = {
  56    /* Total size of the guest state, in bytes. */
  57    .total_sizeB = sizeof(VexGuestMIPS32State),
  58    /* Describe the stack pointer. */
  59    .offset_SP = offsetof(VexGuestMIPS32State, guest_r29),
  60    .sizeof_SP = 4,
  61    /* Describe the frame pointer. */
  62    .offset_FP = offsetof(VexGuestMIPS32State, guest_r30),
  63    .sizeof_FP = 4,
  64    /* Describe the instruction pointer. */
  65    .offset_IP = offsetof(VexGuestMIPS32State, guest_PC),
  66    .sizeof_IP = 4,
  67    /* Describe any sections to be regarded by Memcheck as
  68       'always-defined'. */
  69    .n_alwaysDefd = 8,
  70    /* ? :(  */
  71    .alwaysDefd = {
  72       /* 0 */ ALWAYSDEFD32(guest_r0),
  73       /* 1 */ ALWAYSDEFD32(guest_r1),
  74       /* 2 */ ALWAYSDEFD32(guest_EMNOTE),
  75       /* 3 */ ALWAYSDEFD32(guest_CMSTART),
  76       /* 4 */ ALWAYSDEFD32(guest_CMLEN),
  77       /* 5 */ ALWAYSDEFD32(guest_r29),
  78       /* 6 */ ALWAYSDEFD32(guest_r31),
  79       /* 7 */ ALWAYSDEFD32(guest_ULR)
  80    }
  81 };
  82
  83
  84 #define ASM_VOLATILE_RDHWR(opcode)                                 \
  85    __asm__ __volatile__(".word 0x204001C0 | "#opcode" << 16  \n\t" \
  86                         : "+r" (x) : :                             \
  87                        )
  88
  89 HWord nanomips_dirtyhelper_rdhwr ( UInt rd )
  90 {
  91 #if defined(__nanomips__)
  92    register HWord x __asm__("t4") = 0;
  93
  94    switch (rd) {
  95       case 0:  /* x = CPUNum() */
  96          ASM_VOLATILE_RDHWR(0); /* rdhwr t4, $0 */
  97          break;
  98
  99       case 1:  /* x = SYNCI_Step() */
 100          ASM_VOLATILE_RDHWR(1); /* rdhwr t4, $1 */
 101          break;
 102
 103       case 2:  /* x = CC() */
 104          ASM_VOLATILE_RDHWR(2); /* rdhwr t4, $2 */
 105          break;
 106
 107       case 3:  /* x = CCRes() */
 108          ASM_VOLATILE_RDHWR(3); /* rdhwr t4, $3 */
 109          break;
 110
 111
 112       default:
 113          vassert(0);
 114          break;
 115    }
 116
 117    return x;
 118 #else
 119    return 0;
 120 #endif
 121 }
 122
 123
 124 /*---------------------------------------------------------------*/
 125 /*--- end                            guest_nanomips_helpers.c ---*/
 126 /*---------------------------------------------------------------*/