path: root/target/m68k/cpu.h

/*
 * m68k virtual CPU header
 *
 *  Copyright (c) 2005-2007 CodeSourcery
 *  Written by Paul Brook
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
 */

#ifndef M68K_CPU_H
#define M68K_CPU_H

#define TARGET_LONG_BITS 32

#define CPUArchState struct CPUM68KState

#include "qemu-common.h"
#include "exec/cpu-defs.h"
#include "cpu-qom.h"
#include "fpu/softfloat.h"

#define OS_BYTE     0
#define OS_WORD     1
#define OS_LONG     2
#define OS_SINGLE   3
#define OS_DOUBLE   4
#define OS_EXTENDED 5
#define OS_PACKED   6
#define OS_UNSIZED  7

#define MAX_QREGS 32

#define EXCP_ACCESS         2   /* Access (MMU) error.  */
#define EXCP_ADDRESS        3   /* Address error.  */
#define EXCP_ILLEGAL        4   /* Illegal instruction.  */
#define EXCP_DIV0           5   /* Divide by zero */
#define EXCP_CHK            6   /* CHK, CHK2 Instructions */
#define EXCP_TRAPCC         7   /* FTRAPcc, TRAPcc, TRAPV Instructions */
#define EXCP_PRIVILEGE      8   /* Privilege violation.  */
#define EXCP_TRACE          9
#define EXCP_LINEA          10  /* Unimplemented line-A (MAC) opcode.  */
#define EXCP_LINEF          11  /* Unimplemented line-F (FPU) opcode.  */
#define EXCP_DEBUGNBP       12  /* Non-breakpoint debug interrupt.  */
#define EXCP_DEBEGBP        13  /* Breakpoint debug interrupt.  */
#define EXCP_FORMAT         14  /* RTE format error.  */
#define EXCP_UNINITIALIZED  15
#define EXCP_SPURIOUS       24  /* Spurious interrupt */
#define EXCP_INT_LEVEL_1    25  /* Level 1 Interrupt autovector */
#define EXCP_INT_LEVEL_7    31  /* Level 7 Interrupt autovector */
#define EXCP_TRAP0          32   /* User trap #0.  */
#define EXCP_TRAP15         47   /* User trap #15.  */
#define EXCP_FP_BSUN        48 /* Branch Set on Unordered */
#define EXCP_FP_INEX        49 /* Inexact result */
#define EXCP_FP_DZ          50 /* Divide by Zero */
#define EXCP_FP_UNFL        51 /* Underflow */
#define EXCP_FP_OPERR       52 /* Operand Error */
#define EXCP_FP_OVFL        53 /* Overflow */
#define EXCP_FP_SNAN        54 /* Signaling Not-A-Number */
#define EXCP_FP_UNIMP       55 /* Unimplemented Data type */
#define EXCP_MMU_CONF       56  /* MMU Configuration Error */
#define EXCP_MMU_ILLEGAL    57  /* MMU Illegal Operation Error */
#define EXCP_MMU_ACCESS     58  /* MMU Access Level Violation Error */
#define EXCP_UNSUPPORTED    61

#define EXCP_RTE            0x100
#define EXCP_HALT_INSN      0x101

#define M68K_DTTR0   0
#define M68K_DTTR1   1
#define M68K_ITTR0   2
#define M68K_ITTR1   3

#define M68K_MAX_TTR 2
#define TTR(type, index) ttr[((type & ACCESS_CODE) == ACCESS_CODE) * 2 + index]

#define NB_MMU_MODES 2
#define TARGET_INSN_START_EXTRA_WORDS 1

typedef CPU_LDoubleU FPReg;

typedef struct CPUM68KState {
    uint32_t dregs[8];
    uint32_t aregs[8];
    uint32_t pc;
    uint32_t sr;

    /* SSP and USP.  The current_sp is stored in aregs[7], the other here.  */
    int current_sp;
    uint32_t sp[3];

    /* Condition flags.  */
    uint32_t cc_op;
    uint32_t cc_x; /* always 0/1 */
    uint32_t cc_n; /* in bit 31 (i.e. negative) */
    uint32_t cc_v; /* in bit 31, unused, or computed from cc_n and cc_v */
    uint32_t cc_c; /* either 0/1, unused, or computed from cc_n and cc_v */
    uint32_t cc_z; /* == 0 or unused */

    FPReg fregs[8];
    FPReg fp_result;
    uint32_t fpcr;
    uint32_t fpsr;
    float_status fp_status;

    uint64_t mactmp;
    /* EMAC Hardware deals with 48-bit values composed of one 32-bit and
       two 8-bit parts.  We store a single 64-bit value and
       rearrange/extend this when changing modes.  */
    uint64_t macc[4];
    uint32_t macsr;
    uint32_t mac_mask;

    /* MMU status.  */
    struct {
        uint32_t ar;
        uint32_t ssw;
        /* 68040 */
        uint16_t tcr;
        uint32_t urp;
        uint32_t srp;
        bool fault;
        uint32_t ttr[4];
        uint32_t mmusr;
    } mmu;

    /* Control registers.  */
    uint32_t vbr;
    uint32_t mbar;
    uint32_t rambar0;
    uint32_t cacr;
    uint32_t sfc;
    uint32_t dfc;

    int pending_vector;
    int pending_level;

    uint32_t qregs[MAX_QREGS];

    /* Fields up to this point are cleared by a CPU reset */
    struct {} end_reset_fields;

    CPU_COMMON

    /* Fields from here on are preserved across CPU reset. */
    uint32_t features;
} CPUM68KState;

/**
 * M68kCPU:
 * @env: #CPUM68KState
 *
 * A Motorola 68k CPU.
 */
struct M68kCPU {
    /*< private >*/
    CPUState parent_obj;
    /*< public >*/

    CPUM68KState env;
};

static inline M68kCPU *m68k_env_get_cpu(CPUM68KState *env)
{
    return container_of(env, M68kCPU, env);
}

#define ENV_GET_CPU(e) CPU(m68k_env_get_cpu(e))

#define ENV_OFFSET offsetof(M68kCPU, env)

void m68k_cpu_do_interrupt(CPUState *cpu);
bool m68k_cpu_exec_interrupt(CPUState *cpu, int int_req);
void m68k_cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
                         int flags);
hwaddr m68k_cpu_get_phys_page_debug(CPUState *cpu, vaddr addr);
int m68k_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
int m68k_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);

void m68k_tcg_init(void);
void m68k_cpu_init_gdb(M68kCPU *cpu);
/* you can call this signal handler from your SIGBUS and SIGSEGV
   signal handlers to inform the virtual CPU of exceptions. non zero
   is returned if the signal was handled by the virtual CPU.  */
int cpu_m68k_signal_handler(int host_signum, void *pinfo,
                           void *puc);
uint32_t cpu_m68k_get_ccr(CPUM68KState *env);
void cpu_m68k_set_ccr(CPUM68KState *env, uint32_t);
void cpu_m68k_set_sr(CPUM68KState *env, uint32_t);
void cpu_m68k_set_fpcr(CPUM68KState *env, uint32_t val);


/* Instead of computing the condition codes after each m68k instruction,
 * QEMU just stores one operand (called CC_SRC), the result
 * (called CC_DEST) and the type of operation (called CC_OP). When the
 * condition codes are needed, the condition codes can be calculated
 * using this information. Condition codes are not generated if they
 * are only needed for conditional branches.
 */
typedef enum {
    /* Translator only -- use env->cc_op.  */
    CC_OP_DYNAMIC,

    /* Each flag bit computed into cc_[xcnvz].  */
    CC_OP_FLAGS,

    /* X in cc_x, C = X, N in cc_n, Z in cc_n, V via cc_n/cc_v.  */
    CC_OP_ADDB, CC_OP_ADDW, CC_OP_ADDL,
    CC_OP_SUBB, CC_OP_SUBW, CC_OP_SUBL,

    /* X in cc_x, {N,Z,C,V} via cc_n/cc_v.  */
    CC_OP_CMPB, CC_OP_CMPW, CC_OP_CMPL,

    /* X in cc_x, C = 0, V = 0, N in cc_n, Z in cc_n.  */
    CC_OP_LOGIC,

    CC_OP_NB
} CCOp;

#define CCF_C 0x01
#define CCF_V 0x02
#define CCF_Z 0x04
#define CCF_N 0x08
#define CCF_X 0x10

#define SR_I_SHIFT 8
#define SR_I  0x0700
#define SR_M  0x1000
#define SR_S  0x2000
#define SR_T_SHIFT 14
#define SR_T  0xc000

#define M68K_SSP    0
#define M68K_USP    1
#define M68K_ISP    2

/* bits for 68040 special status word */
#define M68K_CP_040  0x8000
#define M68K_CU_040  0x4000
#define M68K_CT_040  0x2000
#define M68K_CM_040  0x1000
#define M68K_MA_040  0x0800
#define M68K_ATC_040 0x0400
#define M68K_LK_040  0x0200
#define M68K_RW_040  0x0100
#define M68K_SIZ_040 0x0060
#define M68K_TT_040  0x0018
#define M68K_TM_040  0x0007

#define M68K_TM_040_DATA  0x0001
#define M68K_TM_040_CODE  0x0002
#define M68K_TM_040_SUPER 0x0004

/* bits for 68040 write back status word */
#define M68K_WBV_040   0x80
#define M68K_WBSIZ_040 0x60
#define M68K_WBBYT_040 0x20
#define M68K_WBWRD_040 0x40
#define M68K_WBLNG_040 0x00
#define M68K_WBTT_040  0x18
#define M68K_WBTM_040  0x07

/* bus access size codes */
#define M68K_BA_SIZE_MASK    0x60
#define M68K_BA_SIZE_BYTE    0x20
#define M68K_BA_SIZE_WORD    0x40
#define M68K_BA_SIZE_LONG    0x00
#define M68K_BA_SIZE_LINE    0x60

/* bus access transfer type codes */
#define M68K_BA_TT_MOVE16    0x08

/* bits for 68040 MMU status register (mmusr) */
#define M68K_MMU_B_040   0x0800
#define M68K_MMU_G_040   0x0400
#define M68K_MMU_U1_040  0x0200
#define M68K_MMU_U0_040  0x0100
#define M68K_MMU_S_040   0x0080
#define M68K_MMU_CM_040  0x0060
#define M68K_MMU_M_040   0x0010
#define M68K_MMU_WP_040  0x0004
#define M68K_MMU_T_040   0x0002
#define M68K_MMU_R_040   0x0001

#define M68K_MMU_SR_MASK_040 (M68K_MMU_G_040 | M68K_MMU_U1_040 | \
                              M68K_MMU_U0_040 | M68K_MMU_S_040 | \
                              M68K_MMU_CM_040 | M68K_MMU_M_040 | \
                              M68K_MMU_WP_040)

/* bits for 68040 MMU Translation Control Register */
#define M68K_TCR_ENABLED 0x8000
#define M68K_TCR_PAGE_8K 0x4000

/* bits for 68040 MMU Table Descriptor / Page Descriptor / TTR */
#define M68K_DESC_WRITEPROT 0x00000004
#define M68K_DESC_USED      0x00000008
#define M68K_DESC_MODIFIED  0x00000010
#define M68K_DESC_CACHEMODE 0x00000060
#define M68K_DESC_CM_WRTHRU 0x00000000
#define M68K_DESC_CM_COPYBK 0x00000020
#define M68K_DESC_CM_SERIAL 0x00000040
#define M68K_DESC_CM_NCACHE 0x00000060
#define M68K_DESC_SUPERONLY 0x00000080
#define M68K_DESC_USERATTR  0x00000300
#define M68K_DESC_USERATTR_SHIFT     8
#define M68K_DESC_GLOBAL    0x00000400
#define M68K_DESC_URESERVED 0x00000800

#define M68K_ROOT_POINTER_ENTRIES   128
#define M68K_4K_PAGE_MASK           (~0xff)
#define M68K_POINTER_BASE(entry)    (entry & ~0x1ff)
#define M68K_ROOT_INDEX(addr)       ((address >> 23) & 0x1fc)
#define M68K_POINTER_INDEX(addr)    ((address >> 16) & 0x1fc)
#define M68K_4K_PAGE_BASE(entry)    (next & M68K_4K_PAGE_MASK)
#define M68K_4K_PAGE_INDEX(addr)    ((address >> 10) & 0xfc)
#define M68K_8K_PAGE_MASK           (~0x7f)
#define M68K_8K_PAGE_BASE(entry)    (next & M68K_8K_PAGE_MASK)
#define M68K_8K_PAGE_INDEX(addr)    ((address >> 11) & 0x7c)
#define M68K_UDT_VALID(entry)       (entry & 2)
#define M68K_PDT_VALID(entry)       (entry & 3)
#define M68K_PDT_INDIRECT(entry)    ((entry & 3) == 2)
#define M68K_INDIRECT_POINTER(addr) (addr & ~3)
#define M68K_TTS_POINTER_SHIFT      18
#define M68K_TTS_ROOT_SHIFT         25

/* bits for 68040 MMU Transparent Translation Registers */
#define M68K_TTR_ADDR_BASE 0xff000000
#define M68K_TTR_ADDR_MASK 0x00ff0000
#define M68K_TTR_ADDR_MASK_SHIFT    8
#define M68K_TTR_ENABLED   0x00008000
#define M68K_TTR_SFIELD    0x00006000
#define M68K_TTR_SFIELD_USER   0x0000
#define M68K_TTR_SFIELD_SUPER  0x2000

/* m68k Control Registers */

/* ColdFire */
/* Memory Management Control Registers */
#define M68K_CR_ASID     0x003
#define M68K_CR_ACR0     0x004
#define M68K_CR_ACR1     0x005
#define M68K_CR_ACR2     0x006
#define M68K_CR_ACR3     0x007
#define M68K_CR_MMUBAR   0x008

/* Processor Miscellaneous Registers */
#define M68K_CR_PC       0x80F

/* Local Memory and Module Control Registers */
#define M68K_CR_ROMBAR0  0xC00
#define M68K_CR_ROMBAR1  0xC01
#define M68K_CR_RAMBAR0  0xC04
#define M68K_CR_RAMBAR1  0xC05
#define M68K_CR_MPCR     0xC0C
#define M68K_CR_EDRAMBAR 0xC0D
#define M68K_CR_SECMBAR  0xC0E
#define M68K_CR_MBAR     0xC0F

/* Local Memory Address Permutation Control Registers */
#define M68K_CR_PCR1U0   0xD02
#define M68K_CR_PCR1L0   0xD03
#define M68K_CR_PCR2U0   0xD04
#define M68K_CR_PCR2L0   0xD05
#define M68K_CR_PCR3U0   0xD06
#define M68K_CR_PCR3L0   0xD07
#define M68K_CR_PCR1U1   0xD0A
#define M68K_CR_PCR1L1   0xD0B
#define M68K_CR_PCR2U1   0xD0C
#define M68K_CR_PCR2L1   0xD0D
#define M68K_CR_PCR3U1   0xD0E
#define M68K_CR_PCR3L1   0xD0F

/* MC680x0 */
/* MC680[1234]0/CPU32 */
#define M68K_CR_SFC      0x000
#define M68K_CR_DFC      0x001
#define M68K_CR_USP      0x800
#define M68K_CR_VBR      0x801 /* + Coldfire */

/* MC680[234]0 */
#define M68K_CR_CACR     0x002 /* + Coldfire */
#define M68K_CR_CAAR     0x802 /* MC68020 and MC68030 only */
#define M68K_CR_MSP      0x803
#define M68K_CR_ISP      0x804

/* MC68040/MC68LC040 */
#define M68K_CR_TC       0x003
#define M68K_CR_ITT0     0x004
#define M68K_CR_ITT1     0x005
#define M68K_CR_DTT0     0x006
#define M68K_CR_DTT1     0x007
#define M68K_CR_MMUSR    0x805
#define M68K_CR_URP      0x806
#define M68K_CR_SRP      0x807

/* MC68EC040 */
#define M68K_CR_IACR0    0x004
#define M68K_CR_IACR1    0x005
#define M68K_CR_DACR0    0x006
#define M68K_CR_DACR1    0x007

#define M68K_FPIAR_SHIFT  0
#define M68K_FPIAR        (1 << M68K_FPIAR_SHIFT)
#define M68K_FPSR_SHIFT   1
#define M68K_FPSR         (1 << M68K_FPSR_SHIFT)
#define M68K_FPCR_SHIFT   2
#define M68K_FPCR         (1 << M68K_FPCR_SHIFT)

/* Floating-Point Status Register */

/* Condition Code */
#define FPSR_CC_MASK  0x0f000000
#define FPSR_CC_A     0x01000000 /* Not-A-Number */
#define FPSR_CC_I     0x02000000 /* Infinity */
#define FPSR_CC_Z     0x04000000 /* Zero */
#define FPSR_CC_N     0x08000000 /* Negative */

/* Quotient */

#define FPSR_QT_MASK  0x00ff0000

/* Floating-Point Control Register */
/* Rounding mode */
#define FPCR_RND_MASK   0x0030
#define FPCR_RND_N      0x0000
#define FPCR_RND_Z      0x0010
#define FPCR_RND_M      0x0020
#define FPCR_RND_P      0x0030

/* Rounding precision */
#define FPCR_PREC_MASK  0x00c0
#define FPCR_PREC_X     0x0000
#define FPCR_PREC_S     0x0040
#define FPCR_PREC_D     0x0080
#define FPCR_PREC_U     0x00c0

#define FPCR_EXCP_MASK 0xff00

/* CACR fields are implementation defined, but some bits are common.  */
#define M68K_CACR_EUSP  0x10

#define MACSR_PAV0  0x100
#define MACSR_OMC   0x080
#define MACSR_SU    0x040
#define MACSR_FI    0x020
#define MACSR_RT    0x010
#define MACSR_N     0x008
#define MACSR_Z     0x004
#define MACSR_V     0x002
#define MACSR_EV    0x001

void m68k_set_irq_level(M68kCPU *cpu, int level, uint8_t vector);
void m68k_switch_sp(CPUM68KState *env);

void do_m68k_semihosting(CPUM68KState *env, int nr);

/* There are 4 ColdFire core ISA revisions: A, A+, B and C.
   Each feature covers the subset of instructions common to the
   ISA revisions mentioned.  */

enum m68k_features {
    M68K_FEATURE_M68000,
    M68K_FEATURE_CF_ISA_A,
    M68K_FEATURE_CF_ISA_B, /* (ISA B or C).  */
    M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C).  */
    M68K_FEATURE_BRAL, /* Long unconditional branch.  (ISA A+ or B).  */
    M68K_FEATURE_CF_FPU,
    M68K_FEATURE_CF_MAC,
    M68K_FEATURE_CF_EMAC,
    M68K_FEATURE_CF_EMAC_B, /* Revision B EMAC (dual accumulate).  */
    M68K_FEATURE_USP, /* User Stack Pointer.  (ISA A+, B or C).  */
    M68K_FEATURE_EXT_FULL, /* 68020+ full extension word.  */
    M68K_FEATURE_WORD_INDEX, /* word sized address index registers.  */
    M68K_FEATURE_SCALED_INDEX, /* scaled address index registers.  */
    M68K_FEATURE_LONG_MULDIV, /* 32 bit multiply/divide. */
    M68K_FEATURE_QUAD_MULDIV, /* 64 bit multiply/divide. */
    M68K_FEATURE_BCCL, /* Long conditional branches.  */
    M68K_FEATURE_BITFIELD, /* Bit field insns.  */
    M68K_FEATURE_FPU,
    M68K_FEATURE_CAS,
    M68K_FEATURE_BKPT,
    M68K_FEATURE_RTD,
    M68K_FEATURE_CHK2,
    M68K_FEATURE_M68040, /* instructions specific to MC68040 */
    M68K_FEATURE_MOVEP,
};

static inline int m68k_feature(CPUM68KState *env, int feature)
{
    return (env->features & (1u << feature)) != 0;
}

void m68k_cpu_list(FILE *f, fprintf_function cpu_fprintf);

void register_m68k_insns (CPUM68KState *env);

/* Coldfire Linux uses 8k pages
 * and m68k linux uses 4k pages
 * use the smallest one
 */
#define TARGET_PAGE_BITS 12

enum {
    /* 1 bit to define user level / supervisor access */
    ACCESS_SUPER = 0x01,
    /* 1 bit to indicate direction */
    ACCESS_STORE = 0x02,
    /* 1 bit to indicate debug access */
    ACCESS_DEBUG = 0x04,
    /* PTEST instruction */
    ACCESS_PTEST = 0x08,
    /* Type of instruction that generated the access */
    ACCESS_CODE  = 0x10, /* Code fetch access                */
    ACCESS_DATA  = 0x20, /* Data load/store access        */
};

#define TARGET_PHYS_ADDR_SPACE_BITS 32
#define TARGET_VIRT_ADDR_SPACE_BITS 32

#define cpu_init(cpu_model) cpu_generic_init(TYPE_M68K_CPU, cpu_model)

#define M68K_CPU_TYPE_SUFFIX "-" TYPE_M68K_CPU
#define M68K_CPU_TYPE_NAME(model) model M68K_CPU_TYPE_SUFFIX

#define cpu_signal_handler cpu_m68k_signal_handler
#define cpu_list m68k_cpu_list

/* MMU modes definitions */
#define MMU_MODE0_SUFFIX _kernel
#define MMU_MODE1_SUFFIX _user
#define MMU_KERNEL_IDX 0
#define MMU_USER_IDX 1
static inline int cpu_mmu_index (CPUM68KState *env, bool ifetch)
{
    return (env->sr & SR_S) == 0 ? 1 : 0;
}

int m68k_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int size, int rw,
                              int mmu_idx);
void m68k_cpu_unassigned_access(CPUState *cs, hwaddr addr,
                                bool is_write, bool is_exec, int is_asi,
                                unsigned size);

#include "exec/cpu-all.h"

/* TB flags */
#define TB_FLAGS_MACSR          0x0f
#define TB_FLAGS_MSR_S_BIT      13
#define TB_FLAGS_MSR_S          (1 << TB_FLAGS_MSR_S_BIT)
#define TB_FLAGS_SFC_S_BIT      14
#define TB_FLAGS_SFC_S          (1 << TB_FLAGS_SFC_S_BIT)
#define TB_FLAGS_DFC_S_BIT      15
#define TB_FLAGS_DFC_S          (1 << TB_FLAGS_DFC_S_BIT)

static inline void cpu_get_tb_cpu_state(CPUM68KState *env, target_ulong *pc,
                                        target_ulong *cs_base, uint32_t *flags)
{
    *pc = env->pc;
    *cs_base = 0;
    *flags = (env->macsr >> 4) & TB_FLAGS_MACSR;
    if (env->sr & SR_S) {
        *flags |= TB_FLAGS_MSR_S;
        *flags |= (env->sfc << (TB_FLAGS_SFC_S_BIT - 2)) & TB_FLAGS_SFC_S;
        *flags |= (env->dfc << (TB_FLAGS_DFC_S_BIT - 2)) & TB_FLAGS_DFC_S;
    }
}

void dump_mmu(FILE *f, fprintf_function cpu_fprintf, CPUM68KState *env);
#endif