target-lm32/cpu.h

   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 CPU_LM32_H
  21 #define CPU_LM32_H
  22
  23 #define TARGET_LONG_BITS 32
  24
  25 #define CPUState struct CPULM32State
  26
  27 #include "qemu-common.h"
  28 #include "cpu-defs.h"
  29 struct CPULM32State;
  30
  31 #define TARGET_HAS_ICE 1
  32
  33 #define ELF_MACHINE EM_LATTICEMICO32
  34
  35 #define NB_MMU_MODES 1
  36 #define TARGET_PAGE_BITS 12
  37 static inline int cpu_mmu_index(CPUState *env)
  38 {
  39     return 0;
  40 }
  41
  42 #define TARGET_PHYS_ADDR_SPACE_BITS 32
  43 #define TARGET_VIRT_ADDR_SPACE_BITS 32
  44
  45 /* Exceptions indices */
  46 enum {
  47     EXCP_RESET = 0,
  48     EXCP_BREAKPOINT,
  49     EXCP_INSN_BUS_ERROR,
  50     EXCP_WATCHPOINT,
  51     EXCP_DATA_BUS_ERROR,
  52     EXCP_DIVIDE_BY_ZERO,
  53     EXCP_IRQ,
  54     EXCP_SYSTEMCALL
  55 };
  56
  57 /* Registers */
  58 enum {
  59     R_R0 = 0, R_R1, R_R2, R_R3, R_R4, R_R5, R_R6, R_R7, R_R8, R_R9, R_R10,
  60     R_R11, R_R12, R_R13, R_R14, R_R15, R_R16, R_R17, R_R18, R_R19, R_R20,
  61     R_R21, R_R22, R_R23, R_R24, R_R25, R_R26, R_R27, R_R28, R_R29, R_R30,
  62     R_R31
  63 };
  64
  65 /* Register aliases */
  66 enum {
  67     R_GP = R_R26,
  68     R_FP = R_R27,
  69     R_SP = R_R28,
  70     R_RA = R_R29,
  71     R_EA = R_R30,
  72     R_BA = R_R31
  73 };
  74
  75 /* IE flags */
  76 enum {
  77     IE_IE  = (1<<0),
  78     IE_EIE = (1<<1),
  79     IE_BIE = (1<<2),
  80 };
  81
  82 /* DC flags */
  83 enum {
  84     DC_SS  = (1<<0),
  85     DC_RE  = (1<<1),
  86     DC_C0  = (1<<2),
  87     DC_C1  = (1<<3),
  88     DC_C2  = (1<<4),
  89     DC_C3  = (1<<5),
  90 };
  91
  92 /* CFG mask */
  93 enum {
  94     CFG_M         = (1<<0),
  95     CFG_D         = (1<<1),
  96     CFG_S         = (1<<2),
  97     CFG_U         = (1<<3),
  98     CFG_X         = (1<<4),
  99     CFG_CC        = (1<<5),
 100     CFG_IC        = (1<<6),
 101     CFG_DC        = (1<<7),
 102     CFG_G         = (1<<8),
 103     CFG_H         = (1<<9),
 104     CFG_R         = (1<<10),
 105     CFG_J         = (1<<11),
 106     CFG_INT_SHIFT = 12,
 107     CFG_BP_SHIFT  = 18,
 108     CFG_WP_SHIFT  = 22,
 109     CFG_REV_SHIFT = 26,
 110 };
 111
 112 /* CSRs */
 113 enum {
 114     CSR_IE   = 0x00,
 115     CSR_IM   = 0x01,
 116     CSR_IP   = 0x02,
 117     CSR_ICC  = 0x03,
 118     CSR_DCC  = 0x04,
 119     CSR_CC   = 0x05,
 120     CSR_CFG  = 0x06,
 121     CSR_EBA  = 0x07,
 122     CSR_DC   = 0x08,
 123     CSR_DEBA = 0x09,
 124     CSR_JTX  = 0x0e,
 125     CSR_JRX  = 0x0f,
 126     CSR_BP0  = 0x10,
 127     CSR_BP1  = 0x11,
 128     CSR_BP2  = 0x12,
 129     CSR_BP3  = 0x13,
 130     CSR_WP0  = 0x18,
 131     CSR_WP1  = 0x19,
 132     CSR_WP2  = 0x1a,
 133     CSR_WP3  = 0x1b,
 134 };
 135
 136 enum {
 137     LM32_FEATURE_MULTIPLY     =  1,
 138     LM32_FEATURE_DIVIDE       =  2,
 139     LM32_FEATURE_SHIFT        =  4,
 140     LM32_FEATURE_SIGN_EXTEND  =  8,
 141     LM32_FEATURE_I_CACHE      = 16,
 142     LM32_FEATURE_D_CACHE      = 32,
 143     LM32_FEATURE_CYCLE_COUNT  = 64,
 144 };
 145
 146 enum {
 147     LM32_FLAG_IGNORE_MSB = 1,
 148 };
 149
 150 typedef struct CPULM32State {
 151     /* general registers */
 152     uint32_t regs[32];
 153
 154     /* special registers */
 155     uint32_t pc;        /* program counter */
 156     uint32_t ie;        /* interrupt enable */
 157     uint32_t icc;       /* instruction cache control */
 158     uint32_t dcc;       /* data cache control */
 159     uint32_t cc;        /* cycle counter */
 160     uint32_t cfg;       /* configuration */
 161
 162     /* debug registers */
 163     uint32_t dc;        /* debug control */
 164     uint32_t bp[4];     /* breakpoint addresses */
 165     uint32_t wp[4];     /* watchpoint addresses */
 166
 167     CPU_COMMON
 168
 169     uint32_t eba;       /* exception base address */
 170     uint32_t deba;      /* debug exception base address */
 171
 172     /* interrupt controller handle for callbacks */
 173     DeviceState *pic_state;
 174     /* JTAG UART handle for callbacks */
 175     DeviceState *juart_state;
 176
 177     /* processor core features */
 178     uint32_t features;
 179     uint32_t flags;
 180     uint8_t num_bps;
 181     uint8_t num_wps;
 182
 183 } CPULM32State;
 184
 185
 186 CPUState *cpu_lm32_init(const char *cpu_model);
 187 void cpu_lm32_list(FILE *f, fprintf_function cpu_fprintf);
 188 int cpu_lm32_exec(CPUState *s);
 189 void cpu_lm32_close(CPUState *s);
 190 void do_interrupt(CPUState *env);
 191 /* you can call this signal handler from your SIGBUS and SIGSEGV
 192    signal handlers to inform the virtual CPU of exceptions. non zero
 193    is returned if the signal was handled by the virtual CPU.  */
 194 int cpu_lm32_signal_handler(int host_signum, void *pinfo,
 195                           void *puc);
 196 void lm32_translate_init(void);
 197 void cpu_lm32_set_phys_msb_ignore(CPUState *env, int value);
 198
 199 #define cpu_list cpu_lm32_list
 200 #define cpu_init cpu_lm32_init
 201 #define cpu_exec cpu_lm32_exec
 202 #define cpu_gen_code cpu_lm32_gen_code
 203 #define cpu_signal_handler cpu_lm32_signal_handler
 204
 205 #define CPU_SAVE_VERSION 1
 206
 207 int cpu_lm32_handle_mmu_fault(CPUState *env, target_ulong address, int rw,
 208                               int mmu_idx);
 209 #define cpu_handle_mmu_fault cpu_lm32_handle_mmu_fault
 210
 211 #if defined(CONFIG_USER_ONLY)
 212 static inline void cpu_clone_regs(CPUState *env, target_ulong newsp)
 213 {
 214     if (newsp) {
 215         env->regs[R_SP] = newsp;
 216     }
 217     env->regs[R_R1] = 0;
 218 }
 219 #endif
 220
 221 static inline void cpu_set_tls(CPUState *env, target_ulong newtls)
 222 {
 223 }
 224
 225 static inline int cpu_interrupts_enabled(CPUState *env)
 226 {
 227     return env->ie & IE_IE;
 228 }
 229
 230 #include "cpu-all.h"
 231
 232 static inline target_ulong cpu_get_pc(CPUState *env)
 233 {
 234     return env->pc;
 235 }
 236
 237 static inline void cpu_get_tb_cpu_state(CPUState *env, target_ulong *pc,
 238                                         target_ulong *cs_base, int *flags)
 239 {
 240     *pc = env->pc;
 241     *cs_base = 0;
 242     *flags = 0;
 243 }
 244
 245 static inline bool cpu_has_work(CPUState *env)
 246 {
 247     return env->interrupt_request & CPU_INTERRUPT_HARD;
 248 }
 249
 250 #include "exec-all.h"
 251
 252 static inline void cpu_pc_from_tb(CPUState *env, TranslationBlock *tb)
 253 {
 254     env->pc = tb->pc;
 255 }
 256
 257 #endif