sim/m32c/cpu.h

   1 /* cpu.h --- declarations for the M32C core.
   2
   3 Copyright (C) 2005, 2007 Free Software Foundation, Inc.
   4 Contributed by Red Hat, Inc.
   5
   6 This file is part of the GNU simulators.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21
  22 extern int verbose;
  23 extern int trace;
  24 extern int enable_counting;
  25
  26 typedef unsigned char QI;
  27 typedef unsigned short HI;
  28 typedef unsigned long SI;
  29 typedef unsigned long long DI;
  30
  31 #define CPU_R8C         0x11
  32 #define CPU_M16C        0x12
  33 #define CPU_M32CM       0x23
  34 #define CPU_M32C        0x24
  35 extern int m32c_cpu;
  36 void m32c_set_cpu (int cpu);
  37
  38 #define A16 (m32c_cpu & 0x10)
  39 #define A24 (m32c_cpu & 0x20)
  40
  41 typedef struct
  42 {
  43   HI r_r0;
  44   HI r_r2;
  45   HI r_r1;
  46   HI r_r3;
  47   SI r_a0;
  48   SI r_a1;
  49   SI r_sb;
  50   SI r_fb;
  51 } reg_bank_type;
  52
  53 typedef struct
  54 {
  55   reg_bank_type r[2];
  56   QI r_intbh;
  57   HI r_intbl;
  58   SI r_usp;
  59   SI r_isp;
  60   SI r_pc;
  61   HI r_flags;
  62 } regs_type;
  63
  64 extern regs_type regs;
  65 extern int addr_mask;
  66 extern int membus_mask;
  67
  68 #define FLAGBIT_C       0x0001
  69 #define FLAGBIT_D       0x0002
  70 #define FLAGBIT_Z       0x0004
  71 #define FLAGBIT_S       0x0008
  72 #define FLAGBIT_B       0x0010
  73 #define FLAGBIT_O       0x0020
  74 #define FLAGBIT_I       0x0040
  75 #define FLAGBIT_U       0x0080
  76
  77 #define REG_BANK (regs.r_flags & FLAG_B ? 1 : 0)
  78
  79 typedef enum
  80 {
  81   mem,
  82   r0, r0h, r0l,
  83   r1, r1h, r1l,
  84   r2, r2r0,
  85   r3, r3r1,
  86   r3r1r2r0,
  87   r3r2r1r0,
  88   a0,
  89   a1, a1a0,
  90   sb, fb,
  91   intb, intbl, intbh,
  92   sp, usp, isp, pc, flags,
  93   num_regs
  94 } reg_id;
  95
  96 extern char *reg_names[];
  97 extern int reg_bytes[];
  98
  99 extern unsigned int b2mask[];
 100 extern unsigned int b2signbit[];
 101 extern int b2maxsigned[];
 102 extern int b2minsigned[];
 103
 104 void init_regs (void);
 105 void stack_heap_stats (void);
 106 void set_pointer_width (int bytes);
 107 unsigned int get_reg (reg_id id);
 108 DI get_reg_ll (reg_id id);
 109 void put_reg (reg_id id, unsigned int value);
 110 void put_reg_ll (reg_id id, DI value);
 111
 112 void set_flags (int mask, int newbits);
 113 void set_oszc (int value, int bytes, int c);
 114 void set_szc (int value, int bytes, int c);
 115 void set_osz (int value, int bytes);
 116 void set_sz (int value, int bytes);
 117 void set_zc (int z, int c);
 118 void set_c (int c);
 119
 120 const char *bits (int v, int b);
 121
 122 typedef struct
 123 {
 124   QI bytes;
 125   QI mem;
 126   HI mask;
 127   union
 128   {
 129     unsigned int addr;
 130     reg_id reg;
 131   } u;
 132 } srcdest;
 133
 134 void decode_indirect (int src_indirect, int dest_indirect);
 135 void decode_index (int src_addend, int dest_addend);
 136
 137 /* r8c */
 138 srcdest decode_srcdest4 (int destcode, int bw);
 139 srcdest decode_dest3 (int destcode, int bw);
 140 srcdest decode_src2 (int srccode, int bw, int d);
 141 srcdest decode_dest1 (int destcode, int bw);
 142 srcdest decode_jumpdest (int destcode, int w);
 143 srcdest decode_cr (int crcode);
 144 srcdest decode_cr_b (int crcode, int bank);
 145 #define CR_B_DCT0       0
 146 #define CR_B_INTB       1
 147 #define CR_B_DMA0       2
 148
 149 /* m32c */
 150 srcdest decode_dest23 (int ddd, int dd, int bytes);
 151 srcdest decode_src23 (int sss, int ss, int bytes);
 152 srcdest decode_src3 (int sss, int bytes);
 153 srcdest decode_dest2 (int dd, int bytes);
 154
 155 srcdest widen_sd (srcdest sd);
 156 srcdest reg_sd (reg_id reg);
 157
 158 /* Mask has the one appropriate bit set.  */
 159 srcdest decode_bit (int destcode);
 160 srcdest decode_bit11 (int op0);
 161 int get_bit (srcdest sd);
 162 void put_bit (srcdest sd, int val);
 163 int get_bit2 (srcdest sd, int bit);
 164 void put_bit2 (srcdest sd, int bit, int val);
 165
 166 int get_src (srcdest sd);
 167 void put_dest (srcdest sd, int value);
 168
 169 int condition_true (int cond_id);
 170
 171 #define FLAG(f) (regs.r_flags & f ? 1 : 0)
 172 #define FLAG_C  FLAG(FLAGBIT_C)
 173 #define FLAG_D  FLAG(FLAGBIT_D)
 174 #define FLAG_Z  FLAG(FLAGBIT_Z)
 175 #define FLAG_S  FLAG(FLAGBIT_S)
 176 #define FLAG_B  FLAG(FLAGBIT_B)
 177 #define FLAG_O  FLAG(FLAGBIT_O)
 178 #define FLAG_I  FLAG(FLAGBIT_I)
 179 #define FLAG_U  FLAG(FLAGBIT_U)
 180
 181 /* Instruction step return codes.
 182    Suppose one of the decode_* functions below returns a value R:
 183    - If M32C_STEPPED (R), then the single-step completed normally.
 184    - If M32C_HIT_BREAK (R), then the program hit a breakpoint.
 185    - If M32C_EXITED (R), then the program has done an 'exit' system
 186      call, and the exit code is M32C_EXIT_STATUS (R).
 187    - If M32C_STOPPED (R), then a signal (number M32C_STOP_SIG (R)) was
 188      generated.
 189
 190    For building step return codes:
 191    - M32C_MAKE_STEPPED is the return code for finishing a normal step.
 192    - M32C_MAKE_HIT_BREAK is the return code for hitting a breakpoint.
 193    - M32C_MAKE_EXITED (C) is the return code for exiting with status C.
 194    - M32C_MAKE_STOPPED (S) is the return code for stopping on signal S.  */
 195 #define M32C_MAKE_STEPPED()   (0)
 196 #define M32C_MAKE_HIT_BREAK() (1)
 197 #define M32C_MAKE_EXITED(c)   (((int) (c) << 8) + 2)
 198 #define M32C_MAKE_STOPPED(s)  (((int) (s) << 8) + 3)
 199
 200 #define M32C_STEPPED(r)       ((r) == M32C_MAKE_STEPPED ())
 201 #define M32C_HIT_BREAK(r)     ((r) == M32C_MAKE_HIT_BREAK ())
 202 #define M32C_EXITED(r)        (((r) & 0xff) == 2)
 203 #define M32C_EXIT_STATUS(r)   ((r) >> 8)
 204 #define M32C_STOPPED(r)       (((r) & 0xff) == 3)
 205 #define M32C_STOP_SIG(r)      ((r) >> 8)
 206
 207 /* The step result for the current step.  Global to allow
 208    communication between the stepping function and the system
 209    calls.  */
 210 extern int step_result;
 211
 212 /* Used to detect heap/stack collisions */
 213 extern unsigned int heaptop;
 214 extern unsigned int heapbottom;
 215
 216 /* Points to one of the below functions, set by m32c_load().  */
 217 extern int (*decode_opcode) ();
 218
 219 extern int decode_r8c ();
 220 extern int decode_m32c ();
 221
 222 extern void trace_register_changes ();