xref: /illumos-kvm-cmd/target-m68k/cpu.h (revision 68396ea9)
1 /*
2  * m68k virtual CPU header
3  *
4  *  Copyright (c) 2005-2007 CodeSourcery
5  *  Written by Paul Brook
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
19  */
20 #ifndef CPU_M68K_H
21 #define CPU_M68K_H
22 
23 #define TARGET_LONG_BITS 32
24 
25 #define CPUState struct CPUM68KState
26 
27 #include "qemu-common.h"
28 #include "cpu-defs.h"
29 
30 #include "softfloat.h"
31 
32 #define MAX_QREGS 32
33 
34 #define TARGET_HAS_ICE 1
35 
36 #define ELF_MACHINE	EM_68K
37 
38 #define EXCP_ACCESS         2   /* Access (MMU) error.  */
39 #define EXCP_ADDRESS        3   /* Address error.  */
40 #define EXCP_ILLEGAL        4   /* Illegal instruction.  */
41 #define EXCP_DIV0           5   /* Divide by zero */
42 #define EXCP_PRIVILEGE      8   /* Privilege violation.  */
43 #define EXCP_TRACE          9
44 #define EXCP_LINEA          10  /* Unimplemented line-A (MAC) opcode.  */
45 #define EXCP_LINEF          11  /* Unimplemented line-F (FPU) opcode.  */
46 #define EXCP_DEBUGNBP       12  /* Non-breakpoint debug interrupt.  */
47 #define EXCP_DEBEGBP        13  /* Breakpoint debug interrupt.  */
48 #define EXCP_FORMAT         14  /* RTE format error.  */
49 #define EXCP_UNINITIALIZED  15
50 #define EXCP_TRAP0          32   /* User trap #0.  */
51 #define EXCP_TRAP15         47   /* User trap #15.  */
52 #define EXCP_UNSUPPORTED    61
53 #define EXCP_ICE            13
54 
55 #define EXCP_RTE            0x100
56 #define EXCP_HALT_INSN      0x101
57 
58 #define NB_MMU_MODES 2
59 
60 typedef struct CPUM68KState {
61     uint32_t dregs[8];
62     uint32_t aregs[8];
63     uint32_t pc;
64     uint32_t sr;
65 
66     /* SSP and USP.  The current_sp is stored in aregs[7], the other here.  */
67     int current_sp;
68     uint32_t sp[2];
69 
70     /* Condition flags.  */
71     uint32_t cc_op;
72     uint32_t cc_dest;
73     uint32_t cc_src;
74     uint32_t cc_x;
75 
76     float64 fregs[8];
77     float64 fp_result;
78     uint32_t fpcr;
79     uint32_t fpsr;
80     float_status fp_status;
81 
82     uint64_t mactmp;
83     /* EMAC Hardware deals with 48-bit values composed of one 32-bit and
84        two 8-bit parts.  We store a single 64-bit value and
85        rearrange/extend this when changing modes.  */
86     uint64_t macc[4];
87     uint32_t macsr;
88     uint32_t mac_mask;
89 
90     /* Temporary storage for DIV helpers.  */
91     uint32_t div1;
92     uint32_t div2;
93 
94     /* MMU status.  */
95     struct {
96         uint32_t ar;
97     } mmu;
98 
99     /* Control registers.  */
100     uint32_t vbr;
101     uint32_t mbar;
102     uint32_t rambar0;
103     uint32_t cacr;
104 
105     /* ??? remove this.  */
106     uint32_t t1;
107 
108     int pending_vector;
109     int pending_level;
110 
111     uint32_t qregs[MAX_QREGS];
112 
113     CPU_COMMON
114 
115     uint32_t features;
116 } CPUM68KState;
117 
118 void m68k_tcg_init(void);
119 CPUM68KState *cpu_m68k_init(const char *cpu_model);
120 int cpu_m68k_exec(CPUM68KState *s);
121 void cpu_m68k_close(CPUM68KState *s);
122 void do_interrupt(int is_hw);
123 /* you can call this signal handler from your SIGBUS and SIGSEGV
124    signal handlers to inform the virtual CPU of exceptions. non zero
125    is returned if the signal was handled by the virtual CPU.  */
126 int cpu_m68k_signal_handler(int host_signum, void *pinfo,
127                            void *puc);
128 void cpu_m68k_flush_flags(CPUM68KState *, int);
129 
130 enum {
131     CC_OP_DYNAMIC, /* Use env->cc_op  */
132     CC_OP_FLAGS, /* CC_DEST = CVZN, CC_SRC = unused */
133     CC_OP_LOGIC, /* CC_DEST = result, CC_SRC = unused */
134     CC_OP_ADD,   /* CC_DEST = result, CC_SRC = source */
135     CC_OP_SUB,   /* CC_DEST = result, CC_SRC = source */
136     CC_OP_CMPB,  /* CC_DEST = result, CC_SRC = source */
137     CC_OP_CMPW,  /* CC_DEST = result, CC_SRC = source */
138     CC_OP_ADDX,  /* CC_DEST = result, CC_SRC = source */
139     CC_OP_SUBX,  /* CC_DEST = result, CC_SRC = source */
140     CC_OP_SHIFT, /* CC_DEST = result, CC_SRC = carry */
141 };
142 
143 #define CCF_C 0x01
144 #define CCF_V 0x02
145 #define CCF_Z 0x04
146 #define CCF_N 0x08
147 #define CCF_X 0x10
148 
149 #define SR_I_SHIFT 8
150 #define SR_I  0x0700
151 #define SR_M  0x1000
152 #define SR_S  0x2000
153 #define SR_T  0x8000
154 
155 #define M68K_SSP    0
156 #define M68K_USP    1
157 
158 /* CACR fields are implementation defined, but some bits are common.  */
159 #define M68K_CACR_EUSP  0x10
160 
161 #define MACSR_PAV0  0x100
162 #define MACSR_OMC   0x080
163 #define MACSR_SU    0x040
164 #define MACSR_FI    0x020
165 #define MACSR_RT    0x010
166 #define MACSR_N     0x008
167 #define MACSR_Z     0x004
168 #define MACSR_V     0x002
169 #define MACSR_EV    0x001
170 
171 void m68k_set_irq_level(CPUM68KState *env, int level, uint8_t vector);
172 void m68k_set_macsr(CPUM68KState *env, uint32_t val);
173 void m68k_switch_sp(CPUM68KState *env);
174 
175 #define M68K_FPCR_PREC (1 << 6)
176 
177 void do_m68k_semihosting(CPUM68KState *env, int nr);
178 
179 /* There are 4 ColdFire core ISA revisions: A, A+, B and C.
180    Each feature covers the subset of instructions common to the
181    ISA revisions mentioned.  */
182 
183 enum m68k_features {
184     M68K_FEATURE_CF_ISA_A,
185     M68K_FEATURE_CF_ISA_B, /* (ISA B or C).  */
186     M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C).  */
187     M68K_FEATURE_BRAL, /* Long unconditional branch.  (ISA A+ or B).  */
188     M68K_FEATURE_CF_FPU,
189     M68K_FEATURE_CF_MAC,
190     M68K_FEATURE_CF_EMAC,
191     M68K_FEATURE_CF_EMAC_B, /* Revision B EMAC (dual accumulate).  */
192     M68K_FEATURE_USP, /* User Stack Pointer.  (ISA A+, B or C).  */
193     M68K_FEATURE_EXT_FULL, /* 68020+ full extension word.  */
194     M68K_FEATURE_WORD_INDEX /* word sized address index registers.  */
195 };
196 
m68k_feature(CPUM68KState * env,int feature)197 static inline int m68k_feature(CPUM68KState *env, int feature)
198 {
199     return (env->features & (1u << feature)) != 0;
200 }
201 
202 void m68k_cpu_list(FILE *f, fprintf_function cpu_fprintf);
203 
204 void register_m68k_insns (CPUM68KState *env);
205 
206 #ifdef CONFIG_USER_ONLY
207 /* Linux uses 8k pages.  */
208 #define TARGET_PAGE_BITS 13
209 #else
210 /* Smallest TLB entry size is 1k.  */
211 #define TARGET_PAGE_BITS 10
212 #endif
213 
214 #define TARGET_PHYS_ADDR_SPACE_BITS 32
215 #define TARGET_VIRT_ADDR_SPACE_BITS 32
216 
217 #define cpu_init cpu_m68k_init
218 #define cpu_exec cpu_m68k_exec
219 #define cpu_gen_code cpu_m68k_gen_code
220 #define cpu_signal_handler cpu_m68k_signal_handler
221 #define cpu_list m68k_cpu_list
222 
223 /* MMU modes definitions */
224 #define MMU_MODE0_SUFFIX _kernel
225 #define MMU_MODE1_SUFFIX _user
226 #define MMU_USER_IDX 1
cpu_mmu_index(CPUState * env)227 static inline int cpu_mmu_index (CPUState *env)
228 {
229     return (env->sr & SR_S) == 0 ? 1 : 0;
230 }
231 
232 int cpu_m68k_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
233                               int mmu_idx, int is_softmmu);
234 #define cpu_handle_mmu_fault cpu_m68k_handle_mmu_fault
235 
236 #if defined(CONFIG_USER_ONLY)
cpu_clone_regs(CPUState * env,target_ulong newsp)237 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
238 {
239     if (newsp)
240         env->aregs[7] = newsp;
241     env->dregs[0] = 0;
242 }
243 #endif
244 
245 #include "cpu-all.h"
246 
cpu_get_tb_cpu_state(CPUState * env,target_ulong * pc,target_ulong * cs_base,int * flags)247 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
248                                         target_ulong *cs_base, int *flags)
249 {
250     *pc = env->pc;
251     *cs_base = 0;
252     *flags = (env->fpcr & M68K_FPCR_PREC)       /* Bit  6 */
253             | (env->sr & SR_S)                  /* Bit  13 */
254             | ((env->macsr >> 4) & 0xf);        /* Bits 0-3 */
255 }
256 
257 #endif
258