Archipelago » qemu

/*

 * internal execution defines for qemu

 * 

 *  Copyright (c) 2003 Fabrice Bellard

 *

 * 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

 * Lesser 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

#define GEN_FLAG_CODE32_SHIFT 0

#define GEN_FLAG_ADDSEG_SHIFT 1

#define GEN_FLAG_SS32_SHIFT   2

#define GEN_FLAG_VM_SHIFT     3

#define GEN_FLAG_ST_SHIFT     4

#define GEN_FLAG_TF_SHIFT     8 /* same position as eflags */

#define GEN_FLAG_CPL_SHIFT    9

#define GEN_FLAG_IOPL_SHIFT   12 /* same position as eflags */

struct TranslationBlock;

int cpu_x86_gen_code(uint8_t *gen_code_buf, int max_code_size, 

                     int *gen_code_size_ptr,

                     uint8_t *pc_start,  uint8_t *cs_base, int flags,

                     int *code_size_ptr, struct TranslationBlock *tb);

void cpu_x86_tblocks_init(void);

void page_init(void);

int page_unprotect(unsigned long address);

#define CODE_GEN_MAX_SIZE        65536

#define CODE_GEN_ALIGN           16 /* must be >= of the size of a icache line */

#define CODE_GEN_HASH_BITS     15

#define CODE_GEN_HASH_SIZE     (1 << CODE_GEN_HASH_BITS)

/* maximum total translate dcode allocated */

#define CODE_GEN_BUFFER_SIZE     (2048 * 1024)

//#define CODE_GEN_BUFFER_SIZE     (128 * 1024)

#if defined(__powerpc__)

#define USE_DIRECT_JUMP

#endif

typedef struct TranslationBlock {

    unsigned long pc;   /* simulated PC corresponding to this block (EIP + CS base) */

    unsigned long cs_base; /* CS base for this block */

    unsigned int 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) */

    uint8_t *tc_ptr;    /* pointer to the translated code */

    struct TranslationBlock *hash_next; /* next matching block */

    struct TranslationBlock *page_next[2]; /* next blocks in even/odd page */

    /* 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[2]; /* offset of jump instruction */

#else

    uint8_t *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;

} TranslationBlock;

static inline unsigned int tb_hash_func(unsigned long pc)

{

    return pc & (CODE_GEN_HASH_SIZE - 1);

}

TranslationBlock *tb_alloc(unsigned long pc);

void tb_flush(void);

void tb_link(TranslationBlock *tb);

extern TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE];

extern uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];

extern uint8_t *code_gen_ptr;

/* find a translation block in the translation cache. If not found,

   return NULL and the pointer to the last element of the list in pptb */

static inline TranslationBlock *tb_find(TranslationBlock ***pptb,

                                        unsigned long pc, 

                                        unsigned long cs_base,

                                        unsigned int flags)

{

    TranslationBlock **ptb, *tb;

    unsigned int h;

    h = tb_hash_func(pc);

    ptb = &tb_hash[h];

    for(;;) {

        tb = *ptb;

        if (!tb)

            break;

        if (tb->pc == pc && tb->cs_base == cs_base && tb->flags == flags)

            return tb;

        ptb = &tb->hash_next;

    }

    *pptb = ptb;

    return NULL;

}

#if defined(__powerpc__)

static inline void tb_set_jmp_target(TranslationBlock *tb, 

                                     int n, unsigned long addr)

{

    uint32_t val, *ptr;

    unsigned long offset;

    offset = (unsigned long)(tb->tc_ptr + tb->tb_jmp_offset[n]);

    /* patch the branch destination */

    ptr = (uint32_t *)offset;

    val = *ptr;

    val = (val & ~0x03fffffc) | ((addr - offset) & 0x03fffffc);

    *ptr = val;

    /* flush icache */

    asm volatile ("dcbst 0,%0" : : "r"(ptr) : "memory");

    asm volatile ("sync" : : : "memory");

    asm volatile ("icbi 0,%0" : : "r"(ptr) : "memory");

    asm volatile ("sync" : : : "memory");

    asm volatile ("isync" : : : "memory");

}

#else

/* set the jump target */

static inline void tb_set_jmp_target(TranslationBlock *tb, 

                                     int n, unsigned long addr)

{

    tb->tb_next[n] = (void *)addr;

}

#endif

static inline void tb_add_jump(TranslationBlock *tb, int n, 

                               TranslationBlock *tb_next)

{

    /* NOTE: this test is only needed for thread safety */

    if (!tb->jmp_next[n]) {

        /* patch the native jump address */

        tb_set_jmp_target(tb, n, (unsigned long)tb_next->tc_ptr);

        /* add in TB jmp circular list */

        tb->jmp_next[n] = tb_next->jmp_first;

        tb_next->jmp_first = (TranslationBlock *)((long)(tb) | (n));

    }

}

#ifndef offsetof

#define offsetof(type, field) ((size_t) &((type *)0)->field)

#endif

#ifdef __powerpc__

static inline int testandset (int *p)

{

    int ret;

    __asm__ __volatile__ (

                          "0:    lwarx %0,0,%1 ;"

                          "      xor. %0,%3,%0;"

                          "      bne 1f;"

                          "      stwcx. %2,0,%1;"

                          "      bne- 0b;"

                          "1:    "

                          : "=&r" (ret)

                          : "r" (p), "r" (1), "r" (0)

                          : "cr0", "memory");

    return ret;

}

#endif

#ifdef __i386__

static inline int testandset (int *p)

{

    char ret;

    long int readval;

    __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"

                          : "=q" (ret), "=m" (*p), "=a" (readval)

                          : "r" (1), "m" (*p), "a" (0)

                          : "memory");

    return ret;

}

#endif

#ifdef __s390__

static inline int testandset (int *p)

{

    int ret;

    __asm__ __volatile__ ("0: cs    %0,%1,0(%2)\n"

                          "   jl    0b"

                          : "=&d" (ret)

                          : "r" (1), "a" (p), "0" (*p) 

                          : "cc", "memory" );

    return ret;

}

#endif

#ifdef __alpha__

int testandset (int *p)

{

    int ret;

    unsigned long one;

    __asm__ __volatile__ ("0:        mov 1,%2\n"

                          "        ldl_l %0,%1\n"

                          "        stl_c %2,%1\n"

                          "        beq %2,1f\n"

                          ".subsection 2\n"

                          "1:        br 0b\n"

                          ".previous"

                          : "=r" (ret), "=m" (*p), "=r" (one)

                          : "m" (*p));

    return ret;

}

#endif

#ifdef __sparc__

static inline int testandset (int *p)

{

        int ret;

        __asm__ __volatile__("ldstub        [%1], %0"

                             : "=r" (ret)

                             : "r" (p)

                             : "memory");

        return (ret ? 1 : 0);

}

#endif

typedef int spinlock_t;

#define SPIN_LOCK_UNLOCKED 0

static inline void spin_lock(spinlock_t *lock)

{

    while (testandset(lock));

}

static inline void spin_unlock(spinlock_t *lock)

{

    *lock = 0;

}

static inline int spin_trylock(spinlock_t *lock)

{

    return !testandset(lock);

}

extern spinlock_t tb_lock;