Archipelago » qemu

/*

 * Tiny Code Generator for QEMU

 *

 * Copyright (c) 2008 Fabrice Bellard

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "tcg-target.h"

#if TCG_TARGET_REG_BITS == 32

typedef int32_t tcg_target_long;

typedef uint32_t tcg_target_ulong;

#define TCG_PRIlx PRIx32

#define TCG_PRIld PRId32

#elif TCG_TARGET_REG_BITS == 64

typedef int64_t tcg_target_long;

typedef uint64_t tcg_target_ulong;

#define TCG_PRIlx PRIx64

#define TCG_PRIld PRId64

#else

#error unsupported

#endif

#if TCG_TARGET_NB_REGS <= 32

typedef uint32_t TCGRegSet;

#elif TCG_TARGET_NB_REGS <= 64

typedef uint64_t TCGRegSet;

#else

#error unsupported

#endif

enum {

#define DEF(s, n, copy_size) INDEX_op_ ## s,

#include "tcg-opc.h"

#undef DEF

    NB_OPS,

};

#define tcg_regset_clear(d) (d) = 0

#define tcg_regset_set(d, s) (d) = (s)

#define tcg_regset_set32(d, reg, val32) (d) |= (val32) << (reg)

#define tcg_regset_set_reg(d, r) (d) |= 1 << (r)

#define tcg_regset_reset_reg(d, r) (d) &= ~(1 << (r))

#define tcg_regset_test_reg(d, r) (((d) >> (r)) & 1)

#define tcg_regset_or(d, a, b) (d) = (a) | (b)

#define tcg_regset_and(d, a, b) (d) = (a) & (b)

#define tcg_regset_andnot(d, a, b) (d) = (a) & ~(b)

#define tcg_regset_not(d, a) (d) = ~(a)

typedef struct TCGRelocation {

    struct TCGRelocation *next;

    int type;

    uint8_t *ptr;

    tcg_target_long addend;

} TCGRelocation; 

typedef struct TCGLabel {

    int has_value;

    union {

        tcg_target_ulong value;

        TCGRelocation *first_reloc;

    } u;

} TCGLabel;

typedef struct TCGPool {

    struct TCGPool *next;

    int size;

    uint8_t data[0];

} TCGPool;

#define TCG_POOL_CHUNK_SIZE 32768

#define TCG_MAX_LABELS 512

#define TCG_MAX_TEMPS 256

typedef int TCGType;

#define TCG_TYPE_I32 0

#define TCG_TYPE_I64 1

#if TCG_TARGET_REG_BITS == 32

#define TCG_TYPE_PTR TCG_TYPE_I32

#else

#define TCG_TYPE_PTR TCG_TYPE_I64

#endif

typedef tcg_target_ulong TCGArg;

/* call flags */

#define TCG_CALL_TYPE_MASK      0x000f

#define TCG_CALL_TYPE_STD       0x0000 /* standard C call */

#define TCG_CALL_TYPE_REGPARM_1 0x0001 /* i386 style regparm call (1 reg) */

#define TCG_CALL_TYPE_REGPARM_2 0x0002 /* i386 style regparm call (2 regs) */

#define TCG_CALL_TYPE_REGPARM   0x0003 /* i386 style regparm call (3 regs) */

typedef enum {

    TCG_COND_EQ,

    TCG_COND_NE,

    TCG_COND_LT,

    TCG_COND_GE,

    TCG_COND_LE,

    TCG_COND_GT,

    /* unsigned */

    TCG_COND_LTU,

    TCG_COND_GEU,

    TCG_COND_LEU,

    TCG_COND_GTU,

} TCGCond;

#define TEMP_VAL_DEAD  0

#define TEMP_VAL_REG   1

#define TEMP_VAL_MEM   2

#define TEMP_VAL_CONST 3

/* XXX: optimize memory layout */

typedef struct TCGTemp {

    TCGType base_type;

    TCGType type;

    int val_type;

    int reg;

    tcg_target_long val;

    int mem_reg;

    tcg_target_long mem_offset;

    unsigned int fixed_reg:1;

    unsigned int mem_coherent:1;

    unsigned int mem_allocated:1;

    const char *name;

} TCGTemp;

typedef struct TCGHelperInfo {

    void *func;

    const char *name;

} TCGHelperInfo;

typedef struct TCGContext TCGContext;

typedef void TCGMacroFunc(TCGContext *s, int macro_id, const int *dead_args);

struct TCGContext {

    uint8_t *pool_cur, *pool_end;

    TCGPool *pool_first, *pool_current;

    TCGLabel *labels;

    int nb_labels;

    TCGTemp *temps; /* globals first, temps after */

    int nb_globals;

    int nb_temps;

    /* constant indexes (end of temp array) */

    int const_start;

    int const_end;

    /* goto_tb support */

    uint8_t *code_buf;

    unsigned long *tb_next;

    uint16_t *tb_next_offset;

    uint16_t *tb_jmp_offset; /* != NULL if USE_DIRECT_JUMP */

    uint16_t *op_dead_iargs; /* for each operation, each bit tells if the

                                corresponding input argument is dead */

    /* tells in which temporary a given register is. It does not take

       into account fixed registers */

    int reg_to_temp[TCG_TARGET_NB_REGS];

    TCGRegSet reserved_regs;

    tcg_target_long current_frame_offset;

    tcg_target_long frame_start;

    tcg_target_long frame_end;

    int frame_reg;

    uint8_t *code_ptr;

    TCGTemp static_temps[TCG_MAX_TEMPS];

    TCGMacroFunc *macro_func;

    TCGHelperInfo *helpers;

    int nb_helpers;

    int allocated_helpers;

};

extern TCGContext tcg_ctx;

extern uint16_t *gen_opc_ptr;

extern TCGArg *gen_opparam_ptr;

extern uint16_t gen_opc_buf[];

extern TCGArg gen_opparam_buf[];

/* pool based memory allocation */

void *tcg_malloc_internal(TCGContext *s, int size);

void tcg_pool_reset(TCGContext *s);

void tcg_pool_delete(TCGContext *s);

static inline void *tcg_malloc(int size)

{

    TCGContext *s = &tcg_ctx;

    uint8_t *ptr, *ptr_end;

    size = (size + sizeof(long) - 1) & ~(sizeof(long) - 1);

    ptr = s->pool_cur;

    ptr_end = ptr + size;

    if (unlikely(ptr_end > s->pool_end)) {

        return tcg_malloc_internal(&tcg_ctx, size);

    } else {

        s->pool_cur = ptr_end;

        return ptr;

    }

}

void tcg_context_init(TCGContext *s);

void tcg_func_start(TCGContext *s);

int dyngen_code(TCGContext *s, uint8_t *gen_code_buf);

int dyngen_code_search_pc(TCGContext *s, uint8_t *gen_code_buf,

                          const uint8_t *searched_pc);

void tcg_set_frame(TCGContext *s, int reg,

                   tcg_target_long start, tcg_target_long size);

void tcg_set_macro_func(TCGContext *s, TCGMacroFunc *func);

int tcg_global_reg_new(TCGType type, int reg, const char *name);

int tcg_global_mem_new(TCGType type, int reg, tcg_target_long offset,

                       const char *name);

int tcg_temp_new(TCGType type);

char *tcg_get_arg_str(TCGContext *s, char *buf, int buf_size, TCGArg arg);

#define TCG_CT_ALIAS  0x80

#define TCG_CT_IALIAS 0x40

#define TCG_CT_REG    0x01

#define TCG_CT_CONST  0x02 /* any constant of register size */

typedef struct TCGArgConstraint {

    uint32_t ct;

    union {

        TCGRegSet regs;

    } u;

} TCGArgConstraint;

#define TCG_MAX_OP_ARGS 16

#define TCG_OPF_BB_END     0x01 /* instruction defines the end of a basic

                                   block */

#define TCG_OPF_CALL_CLOBBER 0x02 /* instruction clobbers call registers */

typedef struct TCGOpDef {

    const char *name;

    uint8_t nb_oargs, nb_iargs, nb_cargs, nb_args;

    uint8_t flags;

    uint16_t copy_size;

    TCGArgConstraint *args_ct;

    int *sorted_args;

} TCGOpDef;

typedef struct TCGTargetOpDef {

    int op;

    const char *args_ct_str[TCG_MAX_OP_ARGS];

} TCGTargetOpDef;

extern TCGOpDef tcg_op_defs[];

void tcg_target_init(TCGContext *s);

#define tcg_abort() \

do {\

    fprintf(stderr, "%s:%d: tcg fatal error\n", __FILE__, __LINE__);\

    abort();\

} while (0)

void tcg_add_target_add_op_defs(const TCGTargetOpDef *tdefs);

void tcg_gen_call(TCGContext *s, TCGArg func, unsigned int flags,

                  unsigned int nb_rets, const TCGArg *rets,

                  unsigned int nb_params, const TCGArg *args1);

void tcg_gen_shifti_i64(TCGArg ret, TCGArg arg1, 

                        int c, int right, int arith);

/* only used for debugging purposes */

void tcg_register_helper(void *func, const char *name);

#define TCG_HELPER(func) tcg_register_helper(func, #func)

const char *tcg_helper_get_name(TCGContext *s, void *func);

void tcg_dump_ops(TCGContext *s, FILE *outfile);

void dump_ops(const uint16_t *opc_buf, const TCGArg *opparam_buf);

int tcg_const_i32(int32_t val);

int tcg_const_i64(int64_t val);

#if TCG_TARGET_REG_BITS == 32

#define tcg_const_ptr tcg_const_i32

#define tcg_add_ptr tcg_add_i32

#define tcg_sub_ptr tcg_sub_i32

#else

#define tcg_const_ptr tcg_const_i64

#define tcg_add_ptr tcg_add_i64

#define tcg_sub_ptr tcg_sub_i64

#endif

void tcg_out_reloc(TCGContext *s, uint8_t *code_ptr, int type, 

                   int label_index, long addend);

void tcg_reg_alloc_start(TCGContext *s);

void tcg_reg_alloc_bb_end(TCGContext *s);

void tcg_liveness_analysis(TCGContext *s);

const TCGArg *tcg_gen_code_op(TCGContext *s, int opc, const TCGArg *args1,

                              unsigned int dead_iargs);

const TCGArg *dyngen_op(TCGContext *s, int opc, const TCGArg *opparam_ptr);

/* tcg-runtime.c */

int64_t tcg_helper_shl_i64(int64_t arg1, int64_t arg2);

int64_t tcg_helper_shr_i64(int64_t arg1, int64_t arg2);

int64_t tcg_helper_sar_i64(int64_t arg1, int64_t arg2);

int64_t tcg_helper_div_i64(int64_t arg1, int64_t arg2);

int64_t tcg_helper_rem_i64(int64_t arg1, int64_t arg2);

uint64_t tcg_helper_divu_i64(uint64_t arg1, uint64_t arg2);

uint64_t tcg_helper_remu_i64(uint64_t arg1, uint64_t arg2);