1 /* cpu.h --- declarations for the M32C core. 2 3 Copyright (C) 2005-2020 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 extern int in_gdb; 27 28 typedef unsigned char QI; 29 typedef unsigned short HI; 30 typedef unsigned long SI; 31 typedef unsigned long long DI; 32 33 #define CPU_R8C 0x11 34 #define CPU_M16C 0x12 35 #define CPU_M32CM 0x23 36 #define CPU_M32C 0x24 37 extern int m32c_cpu; 38 void m32c_set_cpu (int cpu); 39 40 #define A16 (m32c_cpu & 0x10) 41 #define A24 (m32c_cpu & 0x20) 42 43 typedef struct 44 { 45 HI r_r0; 46 HI r_r2; 47 HI r_r1; 48 HI r_r3; 49 SI r_a0; 50 SI r_a1; 51 SI r_sb; 52 SI r_fb; 53 } reg_bank_type; 54 55 typedef struct 56 { 57 reg_bank_type r[2]; 58 QI r_intbh; 59 HI r_intbl; 60 SI r_usp; 61 SI r_isp; 62 SI r_pc; 63 HI r_flags; 64 } regs_type; 65 66 extern regs_type regs; 67 extern int addr_mask; 68 extern int membus_mask; 69 70 #define FLAGBIT_C 0x0001 71 #define FLAGBIT_D 0x0002 72 #define FLAGBIT_Z 0x0004 73 #define FLAGBIT_S 0x0008 74 #define FLAGBIT_B 0x0010 75 #define FLAGBIT_O 0x0020 76 #define FLAGBIT_I 0x0040 77 #define FLAGBIT_U 0x0080 78 79 #define REG_BANK (regs.r_flags & FLAG_B ? 1 : 0) 80 81 typedef enum 82 { 83 mem, 84 r0, r0h, r0l, 85 r1, r1h, r1l, 86 r2, r2r0, 87 r3, r3r1, 88 r3r1r2r0, 89 r3r2r1r0, 90 a0, 91 a1, a1a0, 92 sb, fb, 93 intb, intbl, intbh, 94 sp, usp, isp, pc, flags, 95 num_regs 96 } reg_id; 97 98 extern char *reg_names[]; 99 extern int reg_bytes[]; 100 101 extern unsigned int b2mask[]; 102 extern unsigned int b2signbit[]; 103 extern int b2maxsigned[]; 104 extern int b2minsigned[]; 105 106 /* address of the opcode that just decoded, and thus caused the 107 exception. */ 108 extern int m32c_opcode_pc; 109 110 void init_regs (void); 111 void stack_heap_stats (void); 112 void set_pointer_width (int bytes); 113 unsigned int get_reg (reg_id id); 114 DI get_reg_ll (reg_id id); 115 void put_reg (reg_id id, unsigned int value); 116 void put_reg_ll (reg_id id, DI value); 117 118 void set_flags (int mask, int newbits); 119 void set_oszc (int value, int bytes, int c); 120 void set_szc (int value, int bytes, int c); 121 void set_osz (int value, int bytes); 122 void set_sz (int value, int bytes); 123 void set_zc (int z, int c); 124 void set_c (int c); 125 126 const char *bits (int v, int b); 127 128 typedef struct 129 { 130 QI bytes; 131 QI mem; 132 HI mask; 133 union 134 { 135 unsigned int addr; 136 reg_id reg; 137 } u; 138 } srcdest; 139 140 void decode_indirect (int src_indirect, int dest_indirect); 141 void decode_index (int src_addend, int dest_addend); 142 143 /* r8c */ 144 srcdest decode_srcdest4 (int destcode, int bw); 145 srcdest decode_dest3 (int destcode, int bw); 146 srcdest decode_src2 (int srccode, int bw, int d); 147 srcdest decode_dest1 (int destcode, int bw); 148 srcdest decode_jumpdest (int destcode, int w); 149 srcdest decode_cr (int crcode); 150 srcdest decode_cr_b (int crcode, int bank); 151 #define CR_B_DCT0 0 152 #define CR_B_INTB 1 153 #define CR_B_DMA0 2 154 155 /* m32c */ 156 srcdest decode_dest23 (int ddd, int dd, int bytes); 157 srcdest decode_src23 (int sss, int ss, int bytes); 158 srcdest decode_src3 (int sss, int bytes); 159 srcdest decode_dest2 (int dd, int bytes); 160 161 srcdest widen_sd (srcdest sd); 162 srcdest reg_sd (reg_id reg); 163 164 /* Mask has the one appropriate bit set. */ 165 srcdest decode_bit (int destcode); 166 srcdest decode_bit11 (int op0); 167 int get_bit (srcdest sd); 168 void put_bit (srcdest sd, int val); 169 int get_bit2 (srcdest sd, int bit); 170 void put_bit2 (srcdest sd, int bit, int val); 171 172 int get_src (srcdest sd); 173 void put_dest (srcdest sd, int value); 174 175 int condition_true (int cond_id); 176 177 #define FLAG(f) (regs.r_flags & f ? 1 : 0) 178 #define FLAG_C FLAG(FLAGBIT_C) 179 #define FLAG_D FLAG(FLAGBIT_D) 180 #define FLAG_Z FLAG(FLAGBIT_Z) 181 #define FLAG_S FLAG(FLAGBIT_S) 182 #define FLAG_B FLAG(FLAGBIT_B) 183 #define FLAG_O FLAG(FLAGBIT_O) 184 #define FLAG_I FLAG(FLAGBIT_I) 185 #define FLAG_U FLAG(FLAGBIT_U) 186 187 /* Instruction step return codes. 188 Suppose one of the decode_* functions below returns a value R: 189 - If M32C_STEPPED (R), then the single-step completed normally. 190 - If M32C_HIT_BREAK (R), then the program hit a breakpoint. 191 - If M32C_EXITED (R), then the program has done an 'exit' system 192 call, and the exit code is M32C_EXIT_STATUS (R). 193 - If M32C_STOPPED (R), then a signal (number M32C_STOP_SIG (R)) was 194 generated. 195 196 For building step return codes: 197 - M32C_MAKE_STEPPED is the return code for finishing a normal step. 198 - M32C_MAKE_HIT_BREAK is the return code for hitting a breakpoint. 199 - M32C_MAKE_EXITED (C) is the return code for exiting with status C. 200 - M32C_MAKE_STOPPED (S) is the return code for stopping on signal S. */ 201 #define M32C_MAKE_STEPPED() (0) 202 #define M32C_MAKE_HIT_BREAK() (1) 203 #define M32C_MAKE_EXITED(c) (((int) (c) << 8) + 2) 204 #define M32C_MAKE_STOPPED(s) (((int) (s) << 8) + 3) 205 206 #define M32C_STEPPED(r) ((r) == M32C_MAKE_STEPPED ()) 207 #define M32C_HIT_BREAK(r) ((r) == M32C_MAKE_HIT_BREAK ()) 208 #define M32C_EXITED(r) (((r) & 0xff) == 2) 209 #define M32C_EXIT_STATUS(r) ((r) >> 8) 210 #define M32C_STOPPED(r) (((r) & 0xff) == 3) 211 #define M32C_STOP_SIG(r) ((r) >> 8) 212 213 /* The step result for the current step. Global to allow 214 communication between the stepping function and the system 215 calls. */ 216 extern int step_result; 217 218 /* Used to detect heap/stack collisions */ 219 extern unsigned int heaptop; 220 extern unsigned int heapbottom; 221 222 /* Points to one of the below functions, set by m32c_load(). */ 223 extern int (*decode_opcode) (void); 224 225 extern int decode_r8c (void); 226 extern int decode_m32c (void); 227 228 extern void trace_register_changes (void); 229 230 extern void m32c_dump_all_registers (void); 231