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, see <http://www.gnu.org/licenses/>.

 */

#ifndef _EXEC_ALL_H_

#define _EXEC_ALL_H_

#include "qemu-common.h"

/* allow to see translation results - the slowdown should be negligible, so we leave it */

#define DEBUG_DISAS

/* Page tracking code uses ram addresses in system mode, and virtual

   addresses in userspace mode.  Define tb_page_addr_t to be an appropriate

   type.  */

#if defined(CONFIG_USER_ONLY)

typedef abi_ulong tb_page_addr_t;

#else

typedef ram_addr_t tb_page_addr_t;

#endif

/* is_jmp field values */

#define DISAS_NEXT    0 /* next instruction can be analyzed */

#define DISAS_JUMP    1 /* only pc was modified dynamically */

#define DISAS_UPDATE  2 /* cpu state was modified dynamically */

#define DISAS_TB_JUMP 3 /* only pc was modified statically */

struct TranslationBlock;

typedef struct TranslationBlock TranslationBlock;

/* XXX: make safe guess about sizes */

#define MAX_OP_PER_INSTR 208

#if HOST_LONG_BITS == 32

#define MAX_OPC_PARAM_PER_ARG 2

#else

#define MAX_OPC_PARAM_PER_ARG 1

#endif

#define MAX_OPC_PARAM_IARGS 4

#define MAX_OPC_PARAM_OARGS 1

#define MAX_OPC_PARAM_ARGS (MAX_OPC_PARAM_IARGS + MAX_OPC_PARAM_OARGS)

/* A Call op needs up to 4 + 2N parameters on 32-bit archs,

 * and up to 4 + N parameters on 64-bit archs

 * (N = number of input arguments + output arguments).  */

#define MAX_OPC_PARAM (4 + (MAX_OPC_PARAM_PER_ARG * MAX_OPC_PARAM_ARGS))

#define OPC_BUF_SIZE 640

#define OPC_MAX_SIZE (OPC_BUF_SIZE - MAX_OP_PER_INSTR)

/* Maximum size a TCG op can expand to.  This is complicated because a

   single op may require several host instructions and register reloads.

   For now take a wild guess at 192 bytes, which should allow at least

   a couple of fixup instructions per argument.  */

#define TCG_MAX_OP_SIZE 192

#define OPPARAM_BUF_SIZE (OPC_BUF_SIZE * MAX_OPC_PARAM)

extern target_ulong gen_opc_pc[OPC_BUF_SIZE];

extern uint8_t gen_opc_instr_start[OPC_BUF_SIZE];

extern uint16_t gen_opc_icount[OPC_BUF_SIZE];

#include "qemu-log.h"

void gen_intermediate_code(CPUState *env, struct TranslationBlock *tb);

void gen_intermediate_code_pc(CPUState *env, struct TranslationBlock *tb);

void restore_state_to_opc(CPUState *env, struct TranslationBlock *tb,

                          int pc_pos);

void cpu_gen_init(void);

int cpu_gen_code(CPUState *env, struct TranslationBlock *tb,

                 int *gen_code_size_ptr);

int cpu_restore_state(struct TranslationBlock *tb,

                      CPUState *env, unsigned long searched_pc);

void cpu_resume_from_signal(CPUState *env1, void *puc);

void cpu_io_recompile(CPUState *env, void *retaddr);

TranslationBlock *tb_gen_code(CPUState *env, 

                              target_ulong pc, target_ulong cs_base, int flags,

                              int cflags);

void cpu_exec_init(CPUState *env);

void QEMU_NORETURN cpu_loop_exit(CPUState *env1);

int page_unprotect(target_ulong address, unsigned long pc, void *puc);

void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end,

                                   int is_cpu_write_access);

void tlb_flush_page(CPUState *env, target_ulong addr);

void tlb_flush(CPUState *env, int flush_global);

#if !defined(CONFIG_USER_ONLY)

void tlb_set_page(CPUState *env, target_ulong vaddr,

                  target_phys_addr_t paddr, int prot,

                  int mmu_idx, target_ulong size);

#endif

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

#define CODE_GEN_PHYS_HASH_BITS     15

#define CODE_GEN_PHYS_HASH_SIZE     (1 << CODE_GEN_PHYS_HASH_BITS)

#define MIN_CODE_GEN_BUFFER_SIZE     (1024 * 1024)

/* estimated block size for TB allocation */

/* XXX: use a per code average code fragment size and modulate it

   according to the host CPU */

#if defined(CONFIG_SOFTMMU)

#define CODE_GEN_AVG_BLOCK_SIZE 128

#else

#define CODE_GEN_AVG_BLOCK_SIZE 64

#endif

#if defined(_ARCH_PPC) || defined(__x86_64__) || defined(__arm__) || defined(__i386__)

#define USE_DIRECT_JUMP

#elif defined(CONFIG_TCG_INTERPRETER)

#define USE_DIRECT_JUMP

#endif

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];

    tb_page_addr_t 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[2]; /* 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;

    uint32_t icount;

};

static inline unsigned int tb_jmp_cache_hash_page(target_ulong pc)

{

    target_ulong tmp;

    tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));

    return (tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK;

}

static inline unsigned int tb_jmp_cache_hash_func(target_ulong pc)

{

    target_ulong tmp;

    tmp = pc ^ (pc >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS));

    return (((tmp >> (TARGET_PAGE_BITS - TB_JMP_PAGE_BITS)) & TB_JMP_PAGE_MASK)

            | (tmp & TB_JMP_ADDR_MASK));

}

static inline unsigned int tb_phys_hash_func(tb_page_addr_t pc)

{

    return (pc >> 2) & (CODE_GEN_PHYS_HASH_SIZE - 1);

}

void tb_free(TranslationBlock *tb);

void tb_flush(CPUState *env);

void tb_link_page(TranslationBlock *tb,

                  tb_page_addr_t phys_pc, tb_page_addr_t phys_page2);

void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);

extern TranslationBlock *tb_phys_hash[CODE_GEN_PHYS_HASH_SIZE];

#if defined(USE_DIRECT_JUMP)

#if defined(CONFIG_TCG_INTERPRETER)

static inline void tb_set_jmp_target1(uintptr_t jmp_addr, uintptr_t addr)

{

    /* patch the branch destination */

    *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);

    /* no need to flush icache explicitly */

}

#elif defined(_ARCH_PPC)

void ppc_tb_set_jmp_target(unsigned long jmp_addr, unsigned long addr);

#define tb_set_jmp_target1 ppc_tb_set_jmp_target

#elif defined(__i386__) || defined(__x86_64__)

static inline void tb_set_jmp_target1(unsigned long jmp_addr, unsigned long addr)

{

    /* patch the branch destination */

    *(uint32_t *)jmp_addr = addr - (jmp_addr + 4);

    /* no need to flush icache explicitly */

}

#elif defined(__arm__)

static inline void tb_set_jmp_target1(unsigned long jmp_addr, unsigned long addr)

{

#if !QEMU_GNUC_PREREQ(4, 1)

    register unsigned long _beg __asm ("a1");

    register unsigned long _end __asm ("a2");

    register unsigned long _flg __asm ("a3");

#endif

    /* we could use a ldr pc, [pc, #-4] kind of branch and avoid the flush */

    *(uint32_t *)jmp_addr =

        (*(uint32_t *)jmp_addr & ~0xffffff)

        | (((addr - (jmp_addr + 8)) >> 2) & 0xffffff);

#if QEMU_GNUC_PREREQ(4, 1)

    __builtin___clear_cache((char *) jmp_addr, (char *) jmp_addr + 4);

#else

    /* flush icache */

    _beg = jmp_addr;

    _end = jmp_addr + 4;

    _flg = 0;

    __asm __volatile__ ("swi 0x9f0002" : : "r" (_beg), "r" (_end), "r" (_flg));

#endif

}

#else

#error tb_set_jmp_target1 is missing

#endif

static inline void tb_set_jmp_target(TranslationBlock *tb,

                                     int n, unsigned long addr)

{

    unsigned long offset;

    offset = tb->tb_jmp_offset[n];

    tb_set_jmp_target1((unsigned long)(tb->tc_ptr + offset), addr);

}

#else

/* set the jump target */

static inline void tb_set_jmp_target(TranslationBlock *tb,

                                     int n, unsigned long addr)

{

    tb->tb_next[n] = 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));

    }

}

TranslationBlock *tb_find_pc(unsigned long pc_ptr);

#include "qemu-lock.h"

extern spinlock_t tb_lock;

extern int tb_invalidated_flag;

/* The return address may point to the start of the next instruction.

   Subtracting one gets us the call instruction itself.  */

#if defined(CONFIG_TCG_INTERPRETER)

/* Alpha and SH4 user mode emulations and Softmmu call GETPC().

   For all others, GETPC remains undefined (which makes TCI a little faster. */

# if defined(CONFIG_SOFTMMU) || defined(TARGET_ALPHA) || defined(TARGET_SH4)

extern void *tci_tb_ptr;

#  define GETPC() tci_tb_ptr

# endif

#elif defined(__s390__) && !defined(__s390x__)

# define GETPC() ((void*)(((unsigned long)__builtin_return_address(0) & 0x7fffffffUL) - 1))

#elif defined(__arm__)

/* Thumb return addresses have the low bit set, so we need to subtract two.

   This is still safe in ARM mode because instructions are 4 bytes.  */

# define GETPC() ((void *)((unsigned long)__builtin_return_address(0) - 2))

#else

# define GETPC() ((void *)((unsigned long)__builtin_return_address(0) - 1))

#endif

#if !defined(CONFIG_USER_ONLY)

extern CPUWriteMemoryFunc *io_mem_write[IO_MEM_NB_ENTRIES][4];

extern CPUReadMemoryFunc *io_mem_read[IO_MEM_NB_ENTRIES][4];

extern void *io_mem_opaque[IO_MEM_NB_ENTRIES];

void tlb_fill(CPUState *env1, target_ulong addr, int is_write, int mmu_idx,

              void *retaddr);

#include "softmmu_defs.h"

#define ACCESS_TYPE (NB_MMU_MODES + 1)

#define MEMSUFFIX _code

#define env cpu_single_env

#define DATA_SIZE 1

#include "softmmu_header.h"

#define DATA_SIZE 2

#include "softmmu_header.h"

#define DATA_SIZE 4

#include "softmmu_header.h"

#define DATA_SIZE 8

#include "softmmu_header.h"

#undef ACCESS_TYPE

#undef MEMSUFFIX

#undef env

#endif

#if defined(CONFIG_USER_ONLY)

static inline tb_page_addr_t get_page_addr_code(CPUState *env1, target_ulong addr)

{

    return addr;

}

#else

/* NOTE: this function can trigger an exception */

/* NOTE2: the returned address is not exactly the physical address: it

   is the offset relative to phys_ram_base */

static inline tb_page_addr_t get_page_addr_code(CPUState *env1, target_ulong addr)

{

    int mmu_idx, page_index, pd;

    void *p;

    page_index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);

    mmu_idx = cpu_mmu_index(env1);

    if (unlikely(env1->tlb_table[mmu_idx][page_index].addr_code !=

                 (addr & TARGET_PAGE_MASK))) {

        ldub_code(addr);

    }

    pd = env1->tlb_table[mmu_idx][page_index].addr_code & ~TARGET_PAGE_MASK;

    if (pd > IO_MEM_ROM && !(pd & IO_MEM_ROMD)) {

#if defined(TARGET_ALPHA) || defined(TARGET_MIPS) || defined(TARGET_SPARC)

        cpu_unassigned_access(env1, addr, 0, 1, 0, 4);

#else

        cpu_abort(env1, "Trying to execute code outside RAM or ROM at 0x" TARGET_FMT_lx "\n", addr);

#endif

    }

    p = (void *)((uintptr_t)addr + env1->tlb_table[mmu_idx][page_index].addend);

    return qemu_ram_addr_from_host_nofail(p);

}

#endif

typedef void (CPUDebugExcpHandler)(CPUState *env);

CPUDebugExcpHandler *cpu_set_debug_excp_handler(CPUDebugExcpHandler *handler);

/* vl.c */

extern int singlestep;

/* cpu-exec.c */

extern volatile sig_atomic_t exit_request;

/* Deterministic execution requires that IO only be performed on the last

   instruction of a TB so that interrupts take effect immediately.  */

static inline int can_do_io(CPUState *env)

{

    if (!use_icount) {

        return 1;

    }

    /* If not executing code then assume we are ok.  */

    if (!env->current_tb) {

        return 1;

    }

    return env->can_do_io != 0;

}

#endif