1/* cpu.h --- declarations for the M32C core.
2
3Copyright (C) 2005, 2007, 2008, 2009, 2010, 2011
4Free Software Foundation, Inc.
5Contributed by Red Hat, Inc.
6
7This file is part of the GNU simulators.
8
9This program is free software; you can redistribute it and/or modify
10it under the terms of the GNU General Public License as published by
11the Free Software Foundation; either version 3 of the License, or
12(at your option) any later version.
13
14This program is distributed in the hope that it will be useful,
15but WITHOUT ANY WARRANTY; without even the implied warranty of
16MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17GNU General Public License for more details.
18
19You should have received a copy of the GNU General Public License
20along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
21
22
23extern int verbose;
24extern int trace;
25extern int enable_counting;
26
27extern int in_gdb;
28
29typedef unsigned char QI;
30typedef unsigned short HI;
31typedef unsigned long SI;
32typedef unsigned long long DI;
33
34#define CPU_R8C		0x11
35#define CPU_M16C	0x12
36#define CPU_M32CM	0x23
37#define CPU_M32C	0x24
38extern int m32c_cpu;
39void m32c_set_cpu (int cpu);
40
41#define A16 (m32c_cpu & 0x10)
42#define A24 (m32c_cpu & 0x20)
43
44typedef struct
45{
46  HI r_r0;
47  HI r_r2;
48  HI r_r1;
49  HI r_r3;
50  SI r_a0;
51  SI r_a1;
52  SI r_sb;
53  SI r_fb;
54} reg_bank_type;
55
56typedef struct
57{
58  reg_bank_type r[2];
59  QI r_intbh;
60  HI r_intbl;
61  SI r_usp;
62  SI r_isp;
63  SI r_pc;
64  HI r_flags;
65} regs_type;
66
67extern regs_type regs;
68extern int addr_mask;
69extern int membus_mask;
70
71#define FLAGBIT_C	0x0001
72#define FLAGBIT_D	0x0002
73#define FLAGBIT_Z	0x0004
74#define FLAGBIT_S	0x0008
75#define FLAGBIT_B	0x0010
76#define FLAGBIT_O	0x0020
77#define FLAGBIT_I	0x0040
78#define FLAGBIT_U	0x0080
79
80#define REG_BANK (regs.r_flags & FLAG_B ? 1 : 0)
81
82typedef enum
83{
84  mem,
85  r0, r0h, r0l,
86  r1, r1h, r1l,
87  r2, r2r0,
88  r3, r3r1,
89  r3r1r2r0,
90  r3r2r1r0,
91  a0,
92  a1, a1a0,
93  sb, fb,
94  intb, intbl, intbh,
95  sp, usp, isp, pc, flags,
96  num_regs
97} reg_id;
98
99extern char *reg_names[];
100extern int reg_bytes[];
101
102extern unsigned int b2mask[];
103extern unsigned int b2signbit[];
104extern int b2maxsigned[];
105extern int b2minsigned[];
106
107/* address of the opcode that just decoded, and thus caused the
108   exception.  */
109extern int m32c_opcode_pc;
110
111void init_regs (void);
112void stack_heap_stats (void);
113void set_pointer_width (int bytes);
114unsigned int get_reg (reg_id id);
115DI get_reg_ll (reg_id id);
116void put_reg (reg_id id, unsigned int value);
117void put_reg_ll (reg_id id, DI value);
118
119void set_flags (int mask, int newbits);
120void set_oszc (int value, int bytes, int c);
121void set_szc (int value, int bytes, int c);
122void set_osz (int value, int bytes);
123void set_sz (int value, int bytes);
124void set_zc (int z, int c);
125void set_c (int c);
126
127const char *bits (int v, int b);
128
129typedef struct
130{
131  QI bytes;
132  QI mem;
133  HI mask;
134  union
135  {
136    unsigned int addr;
137    reg_id reg;
138  } u;
139} srcdest;
140
141void decode_indirect (int src_indirect, int dest_indirect);
142void decode_index (int src_addend, int dest_addend);
143
144/* r8c */
145srcdest decode_srcdest4 (int destcode, int bw);
146srcdest decode_dest3 (int destcode, int bw);
147srcdest decode_src2 (int srccode, int bw, int d);
148srcdest decode_dest1 (int destcode, int bw);
149srcdest decode_jumpdest (int destcode, int w);
150srcdest decode_cr (int crcode);
151srcdest decode_cr_b (int crcode, int bank);
152#define CR_B_DCT0	0
153#define CR_B_INTB	1
154#define CR_B_DMA0	2
155
156/* m32c */
157srcdest decode_dest23 (int ddd, int dd, int bytes);
158srcdest decode_src23 (int sss, int ss, int bytes);
159srcdest decode_src3 (int sss, int bytes);
160srcdest decode_dest2 (int dd, int bytes);
161
162srcdest widen_sd (srcdest sd);
163srcdest reg_sd (reg_id reg);
164
165/* Mask has the one appropriate bit set.  */
166srcdest decode_bit (int destcode);
167srcdest decode_bit11 (int op0);
168int get_bit (srcdest sd);
169void put_bit (srcdest sd, int val);
170int get_bit2 (srcdest sd, int bit);
171void put_bit2 (srcdest sd, int bit, int val);
172
173int get_src (srcdest sd);
174void put_dest (srcdest sd, int value);
175
176int condition_true (int cond_id);
177
178#define FLAG(f) (regs.r_flags & f ? 1 : 0)
179#define FLAG_C	FLAG(FLAGBIT_C)
180#define FLAG_D	FLAG(FLAGBIT_D)
181#define FLAG_Z	FLAG(FLAGBIT_Z)
182#define FLAG_S	FLAG(FLAGBIT_S)
183#define FLAG_B	FLAG(FLAGBIT_B)
184#define FLAG_O	FLAG(FLAGBIT_O)
185#define FLAG_I	FLAG(FLAGBIT_I)
186#define FLAG_U	FLAG(FLAGBIT_U)
187
188/* Instruction step return codes.
189   Suppose one of the decode_* functions below returns a value R:
190   - If M32C_STEPPED (R), then the single-step completed normally.
191   - If M32C_HIT_BREAK (R), then the program hit a breakpoint.
192   - If M32C_EXITED (R), then the program has done an 'exit' system
193     call, and the exit code is M32C_EXIT_STATUS (R).
194   - If M32C_STOPPED (R), then a signal (number M32C_STOP_SIG (R)) was
195     generated.
196
197   For building step return codes:
198   - M32C_MAKE_STEPPED is the return code for finishing a normal step.
199   - M32C_MAKE_HIT_BREAK is the return code for hitting a breakpoint.
200   - M32C_MAKE_EXITED (C) is the return code for exiting with status C.
201   - M32C_MAKE_STOPPED (S) is the return code for stopping on signal S.  */
202#define M32C_MAKE_STEPPED()   (0)
203#define M32C_MAKE_HIT_BREAK() (1)
204#define M32C_MAKE_EXITED(c)   (((int) (c) << 8) + 2)
205#define M32C_MAKE_STOPPED(s)  (((int) (s) << 8) + 3)
206
207#define M32C_STEPPED(r)       ((r) == M32C_MAKE_STEPPED ())
208#define M32C_HIT_BREAK(r)     ((r) == M32C_MAKE_HIT_BREAK ())
209#define M32C_EXITED(r)        (((r) & 0xff) == 2)
210#define M32C_EXIT_STATUS(r)   ((r) >> 8)
211#define M32C_STOPPED(r)       (((r) & 0xff) == 3)
212#define M32C_STOP_SIG(r)      ((r) >> 8)
213
214/* The step result for the current step.  Global to allow
215   communication between the stepping function and the system
216   calls.  */
217extern int step_result;
218
219/* Used to detect heap/stack collisions */
220extern unsigned int heaptop;
221extern unsigned int heapbottom;
222
223/* Points to one of the below functions, set by m32c_load().  */
224extern int (*decode_opcode) ();
225
226extern int decode_r8c ();
227extern int decode_m32c ();
228
229extern void trace_register_changes ();
230