1 /*
2 * LatticeMico32 virtual CPU header.
3 *
4 * Copyright (c) 2010 Michael Walle <michael@walle.cc>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #ifndef LM32_CPU_H
21 #define LM32_CPU_H
22
23 #define TARGET_LONG_BITS 32
24
25 #define CPUArchState struct CPULM32State
26
27 #include "qemu-common.h"
28 #include "cpu-qom.h"
29 #include "exec/cpu-defs.h"
30 struct CPULM32State;
31 typedef struct CPULM32State CPULM32State;
32
33 #define NB_MMU_MODES 1
34 #define TARGET_PAGE_BITS 12
cpu_mmu_index(CPULM32State * env,bool ifetch)35 static inline int cpu_mmu_index(CPULM32State *env, bool ifetch)
36 {
37 return 0;
38 }
39
40 #define TARGET_PHYS_ADDR_SPACE_BITS 32
41 #define TARGET_VIRT_ADDR_SPACE_BITS 32
42
43 /* Exceptions indices */
44 enum {
45 EXCP_RESET = 0,
46 EXCP_BREAKPOINT,
47 EXCP_INSN_BUS_ERROR,
48 EXCP_WATCHPOINT,
49 EXCP_DATA_BUS_ERROR,
50 EXCP_DIVIDE_BY_ZERO,
51 EXCP_IRQ,
52 EXCP_SYSTEMCALL
53 };
54
55 /* Registers */
56 enum {
57 R_R0 = 0, R_R1, R_R2, R_R3, R_R4, R_R5, R_R6, R_R7, R_R8, R_R9, R_R10,
58 R_R11, R_R12, R_R13, R_R14, R_R15, R_R16, R_R17, R_R18, R_R19, R_R20,
59 R_R21, R_R22, R_R23, R_R24, R_R25, R_R26, R_R27, R_R28, R_R29, R_R30,
60 R_R31
61 };
62
63 /* Register aliases */
64 enum {
65 R_GP = R_R26,
66 R_FP = R_R27,
67 R_SP = R_R28,
68 R_RA = R_R29,
69 R_EA = R_R30,
70 R_BA = R_R31
71 };
72
73 /* IE flags */
74 enum {
75 IE_IE = (1<<0),
76 IE_EIE = (1<<1),
77 IE_BIE = (1<<2),
78 };
79
80 /* DC flags */
81 enum {
82 DC_SS = (1<<0),
83 DC_RE = (1<<1),
84 DC_C0 = (1<<2),
85 DC_C1 = (1<<3),
86 DC_C2 = (1<<4),
87 DC_C3 = (1<<5),
88 };
89
90 /* CFG mask */
91 enum {
92 CFG_M = (1<<0),
93 CFG_D = (1<<1),
94 CFG_S = (1<<2),
95 CFG_U = (1<<3),
96 CFG_X = (1<<4),
97 CFG_CC = (1<<5),
98 CFG_IC = (1<<6),
99 CFG_DC = (1<<7),
100 CFG_G = (1<<8),
101 CFG_H = (1<<9),
102 CFG_R = (1<<10),
103 CFG_J = (1<<11),
104 CFG_INT_SHIFT = 12,
105 CFG_BP_SHIFT = 18,
106 CFG_WP_SHIFT = 22,
107 CFG_REV_SHIFT = 26,
108 };
109
110 /* CSRs */
111 enum {
112 CSR_IE = 0x00,
113 CSR_IM = 0x01,
114 CSR_IP = 0x02,
115 CSR_ICC = 0x03,
116 CSR_DCC = 0x04,
117 CSR_CC = 0x05,
118 CSR_CFG = 0x06,
119 CSR_EBA = 0x07,
120 CSR_DC = 0x08,
121 CSR_DEBA = 0x09,
122 CSR_JTX = 0x0e,
123 CSR_JRX = 0x0f,
124 CSR_BP0 = 0x10,
125 CSR_BP1 = 0x11,
126 CSR_BP2 = 0x12,
127 CSR_BP3 = 0x13,
128 CSR_WP0 = 0x18,
129 CSR_WP1 = 0x19,
130 CSR_WP2 = 0x1a,
131 CSR_WP3 = 0x1b,
132 };
133
134 enum {
135 LM32_FEATURE_MULTIPLY = 1,
136 LM32_FEATURE_DIVIDE = 2,
137 LM32_FEATURE_SHIFT = 4,
138 LM32_FEATURE_SIGN_EXTEND = 8,
139 LM32_FEATURE_I_CACHE = 16,
140 LM32_FEATURE_D_CACHE = 32,
141 LM32_FEATURE_CYCLE_COUNT = 64,
142 };
143
144 enum {
145 LM32_FLAG_IGNORE_MSB = 1,
146 };
147
148 struct CPULM32State {
149 /* general registers */
150 uint32_t regs[32];
151
152 /* special registers */
153 uint32_t pc; /* program counter */
154 uint32_t ie; /* interrupt enable */
155 uint32_t icc; /* instruction cache control */
156 uint32_t dcc; /* data cache control */
157 uint32_t cc; /* cycle counter */
158 uint32_t cfg; /* configuration */
159
160 /* debug registers */
161 uint32_t dc; /* debug control */
162 uint32_t bp[4]; /* breakpoints */
163 uint32_t wp[4]; /* watchpoints */
164
165 struct CPUBreakpoint *cpu_breakpoint[4];
166 struct CPUWatchpoint *cpu_watchpoint[4];
167
168 /* Fields up to this point are cleared by a CPU reset */
169 struct {} end_reset_fields;
170
171 CPU_COMMON
172
173 /* Fields from here on are preserved across CPU reset. */
174 uint32_t eba; /* exception base address */
175 uint32_t deba; /* debug exception base address */
176
177 /* interrupt controller handle for callbacks */
178 DeviceState *pic_state;
179 /* JTAG UART handle for callbacks */
180 DeviceState *juart_state;
181
182 /* processor core features */
183 uint32_t flags;
184
185 };
186
187 /**
188 * LM32CPU:
189 * @env: #CPULM32State
190 *
191 * A LatticeMico32 CPU.
192 */
193 struct LM32CPU {
194 /*< private >*/
195 CPUState parent_obj;
196 /*< public >*/
197
198 CPULM32State env;
199
200 uint32_t revision;
201 uint8_t num_interrupts;
202 uint8_t num_breakpoints;
203 uint8_t num_watchpoints;
204 uint32_t features;
205 };
206
lm32_env_get_cpu(CPULM32State * env)207 static inline LM32CPU *lm32_env_get_cpu(CPULM32State *env)
208 {
209 return container_of(env, LM32CPU, env);
210 }
211
212 #define ENV_GET_CPU(e) CPU(lm32_env_get_cpu(e))
213
214 #define ENV_OFFSET offsetof(LM32CPU, env)
215
216 #ifndef CONFIG_USER_ONLY
217 extern const struct VMStateDescription vmstate_lm32_cpu;
218 #endif
219
220 void lm32_cpu_do_interrupt(CPUState *cpu);
221 bool lm32_cpu_exec_interrupt(CPUState *cs, int int_req);
222 void lm32_cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
223 int flags);
224 hwaddr lm32_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
225 int lm32_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
226 int lm32_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
227
228 typedef enum {
229 LM32_WP_DISABLED = 0,
230 LM32_WP_READ,
231 LM32_WP_WRITE,
232 LM32_WP_READ_WRITE,
233 } lm32_wp_t;
234
lm32_wp_type(uint32_t dc,int idx)235 static inline lm32_wp_t lm32_wp_type(uint32_t dc, int idx)
236 {
237 assert(idx < 4);
238 return (dc >> (idx+1)*2) & 0x3;
239 }
240
241 /* you can call this signal handler from your SIGBUS and SIGSEGV
242 signal handlers to inform the virtual CPU of exceptions. non zero
243 is returned if the signal was handled by the virtual CPU. */
244 int cpu_lm32_signal_handler(int host_signum, void *pinfo,
245 void *puc);
246 void lm32_cpu_list(FILE *f, fprintf_function cpu_fprintf);
247 void lm32_translate_init(void);
248 void cpu_lm32_set_phys_msb_ignore(CPULM32State *env, int value);
249 void QEMU_NORETURN raise_exception(CPULM32State *env, int index);
250 void lm32_debug_excp_handler(CPUState *cs);
251 void lm32_breakpoint_insert(CPULM32State *env, int index, target_ulong address);
252 void lm32_breakpoint_remove(CPULM32State *env, int index);
253 void lm32_watchpoint_insert(CPULM32State *env, int index, target_ulong address,
254 lm32_wp_t wp_type);
255 void lm32_watchpoint_remove(CPULM32State *env, int index);
256 bool lm32_cpu_do_semihosting(CPUState *cs);
257
258 #define LM32_CPU_TYPE_SUFFIX "-" TYPE_LM32_CPU
259 #define LM32_CPU_TYPE_NAME(model) model LM32_CPU_TYPE_SUFFIX
260 #define CPU_RESOLVING_TYPE TYPE_LM32_CPU
261
262 #define cpu_list lm32_cpu_list
263 #define cpu_signal_handler cpu_lm32_signal_handler
264
265 int lm32_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int size, int rw,
266 int mmu_idx);
267
268 #include "exec/cpu-all.h"
269
cpu_get_tb_cpu_state(CPULM32State * env,target_ulong * pc,target_ulong * cs_base,uint32_t * flags)270 static inline void cpu_get_tb_cpu_state(CPULM32State *env, target_ulong *pc,
271 target_ulong *cs_base, uint32_t *flags)
272 {
273 *pc = env->pc;
274 *cs_base = 0;
275 *flags = 0;
276 }
277
278 #endif
279