2011-9-17 17:59:04

 

2011-9-17 17:59:04

static inline void tcg_gen_mov_i32(TCGv_i32 ret, TCGv_i32 arg)
{
    if (!TCGV_EQUAL_I32(ret, arg))
        tcg_gen_op2_i32(INDEX_op_mov_i32, ret, arg);
}

指令放指令 参数放参数

#define gen_op_movl_T0_T1() tcg_gen_mov_i32(cpu_T[0], cpu_T[1])
#define gen_op_movl_T0_im(im) tcg_gen_movi_i32(cpu_T[0], im)
#define gen_op_movl_T1_im(im) tcg_gen_movi_i32(cpu_T[1], im)

#define gen_op_addl_T1_im(im) tcg_gen_addi_i32(cpu_T[1], cpu_T[1], im)
#define gen_op_addl_T0_T1() tcg_gen_add_i32(cpu_T[0], cpu_T[0], cpu_T[1])
#define gen_op_subl_T0_T1() tcg_gen_sub_i32(cpu_T[0], cpu_T[0], cpu_T[1])
#define gen_op_rsbl_T0_T1() tcg_gen_sub_i32(cpu_T[0], cpu_T[1], cpu_T[0])

mov指令 和 加减指令

 

/* ??? Flag setting arithmetic is awkward because we need to do comparisons.
   The only way to do that in TCG is a conditional branch, which clobbers
   all our temporaries.  For now implement these as helper functions.  */

uint32_t HELPER (add_cc)(uint32_t a, uint32_t b)
{
    uint32_t result;
    result = a + b;
    env->NF = env->ZF = result;
    env->CF = result < a;
    env->VF = (a ^ b ^ -1) & (a ^ result);
    return result;
}

uint32_t HELPER(adc_cc)(uint32_t a, uint32_t b)
{
    uint32_t result;
    if (!env->CF) {
        result = a + b;
        env->CF = result < a;
    } else {
        result = a + b + 1;
        env->CF = result <= a;
    }
    env->VF = (a ^ b ^ -1) & (a ^ result);
    env->NF = env->ZF = result;
    return result;
}

加法和考虑进位的加法

uint32_t HELPER(sub_cc)(uint32_t a, uint32_t b)
{
    uint32_t result;
    result = a - b;
    env->NF = env->ZF = result;
    env->CF = a >= b;
    env->VF = (a ^ b) & (a ^ result);
    return result;
}

uint32_t HELPER(sbc_cc)(uint32_t a, uint32_t b)
{
    uint32_t result;
    if (!env->CF) {
        result = a - b - 1;
        env->CF = a > b;
    } else {
        result = a - b;
        env->CF = a >= b;
    }
    env->VF = (a ^ b) & (a ^ result);
    env->NF = env->ZF = result;
    return result;
}

减法和考虑借位的减法

 

struct TranslationBlock {
    target_ulong pc;   /* simulated PC corresponding to this block (EIP + CS base) */
    target_ulong cs_base; /* CS base for this block */
    uint64_t flags; /* flags defining in which context the code was generated */
    uint16_t size;      /* size of target code for this block (1 <=
                           size <= TARGET_PAGE_SIZE) */
    uint16_t cflags;    /* compile flags */
#define CF_COUNT_MASK  0x7fff
#define CF_LAST_IO     0x8000 /* Last insn may be an IO access.  */

    uint8_t *tc_ptr;    /* pointer to the translated code */
    /* next matching tb for physical address. */
    struct TranslationBlock *phys_hash_next;
    /* first and second physical page containing code. The lower bit
       of the pointer tells the index in page_next[] */
    struct TranslationBlock *page_next[2];
    target_ulong page_addr[2];

    /* the following data are used to directly call another TB from
       the code of this one. */
    uint16_t tb_next_offset[2]; /* offset of original jump target */
#ifdef USE_DIRECT_JUMP
    uint16_t tb_jmp_offset[4]; /* offset of jump instruction */
#else
    unsigned long tb_next[2]; /* address of jump generated code */
#endif
    /* list of TBs jumping to this one. This is a circular list using
       the two least significant bits of the pointers to tell what is
       the next pointer: 0 = jmp_next[0], 1 = jmp_next[1], 2 =
       jmp_first */
    struct TranslationBlock *jmp_next[2];
    struct TranslationBlock *jmp_first;
#ifdef CONFIG_TRACE
    struct BBRec *bb_rec;
    uint64_t prev_time;
#endif

#ifdef CONFIG_MEMCHECK
    /* Maps PCs in this translation block to corresponding PCs in guest address
     * space. The array is arranged in such way, that every even entry contains
     * PC in the translation block, followed by an odd entry that contains
     * guest PC corresponding to that PC in the translation block. This
     * arrangement is set by tcg_gen_code_common that initializes this array
     * when performing guest code translation. */
    target_ulong*   tpc2gpc;
    /* Number of pairs (pc_tb, pc_guest) in tpc2gpc array. */
    unsigned int    tpc2gpc_pairs;
#endif  // CONFIG_MEMCHECK

    uint32_t icount;
};

TB 再贴一遍