Archipelago » qemu

/*

 * defines common to all virtual CPUs

 *

 *  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 CPU_ALL_H

#define CPU_ALL_H

#include "qemu-common.h"

#include "cpu-common.h"

/* some important defines:

 *

 * WORDS_ALIGNED : if defined, the host cpu can only make word aligned

 * memory accesses.

 *

 * HOST_WORDS_BIGENDIAN : if defined, the host cpu is big endian and

 * otherwise little endian.

 *

 * (TARGET_WORDS_ALIGNED : same for target cpu (not supported yet))

 *

 * TARGET_WORDS_BIGENDIAN : same for target cpu

 */

#include "softfloat.h"

#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)

#define BSWAP_NEEDED

#endif

#ifdef BSWAP_NEEDED

static inline uint16_t tswap16(uint16_t s)

{

    return bswap16(s);

}

static inline uint32_t tswap32(uint32_t s)

{

    return bswap32(s);

}

static inline uint64_t tswap64(uint64_t s)

{

    return bswap64(s);

}

static inline void tswap16s(uint16_t *s)

{

    *s = bswap16(*s);

}

static inline void tswap32s(uint32_t *s)

{

    *s = bswap32(*s);

}

static inline void tswap64s(uint64_t *s)

{

    *s = bswap64(*s);

}

#else

static inline uint16_t tswap16(uint16_t s)

{

    return s;

}

static inline uint32_t tswap32(uint32_t s)

{

    return s;

}

static inline uint64_t tswap64(uint64_t s)

{

    return s;

}

static inline void tswap16s(uint16_t *s)

{

}

static inline void tswap32s(uint32_t *s)

{

}

static inline void tswap64s(uint64_t *s)

{

}

#endif

#if TARGET_LONG_SIZE == 4

#define tswapl(s) tswap32(s)

#define tswapls(s) tswap32s((uint32_t *)(s))

#define bswaptls(s) bswap32s(s)

#else

#define tswapl(s) tswap64(s)

#define tswapls(s) tswap64s((uint64_t *)(s))

#define bswaptls(s) bswap64s(s)

#endif

typedef union {

    float32 f;

    uint32_t l;

} CPU_FloatU;

/* NOTE: arm FPA is horrible as double 32 bit words are stored in big

   endian ! */

typedef union {

    float64 d;

#if defined(HOST_WORDS_BIGENDIAN) \

    || (defined(__arm__) && !defined(__VFP_FP__) && !defined(CONFIG_SOFTFLOAT))

    struct {

        uint32_t upper;

        uint32_t lower;

    } l;

#else

    struct {

        uint32_t lower;

        uint32_t upper;

    } l;

#endif

    uint64_t ll;

} CPU_DoubleU;

#ifdef TARGET_SPARC

typedef union {

    float128 q;

#if defined(HOST_WORDS_BIGENDIAN) \

    || (defined(__arm__) && !defined(__VFP_FP__) && !defined(CONFIG_SOFTFLOAT))

    struct {

        uint32_t upmost;

        uint32_t upper;

        uint32_t lower;

        uint32_t lowest;

    } l;

    struct {

        uint64_t upper;

        uint64_t lower;

    } ll;

#else

    struct {

        uint32_t lowest;

        uint32_t lower;

        uint32_t upper;

        uint32_t upmost;

    } l;

    struct {

        uint64_t lower;

        uint64_t upper;

    } ll;

#endif

} CPU_QuadU;

#endif

/* CPU memory access without any memory or io remapping */

/*

 * the generic syntax for the memory accesses is:

 *

 * load: ld{type}{sign}{size}{endian}_{access_type}(ptr)

 *

 * store: st{type}{size}{endian}_{access_type}(ptr, val)

 *

 * type is:

 * (empty): integer access

 *   f    : float access

 *

 * sign is:

 * (empty): for floats or 32 bit size

 *   u    : unsigned

 *   s    : signed

 *

 * size is:

 *   b: 8 bits

 *   w: 16 bits

 *   l: 32 bits

 *   q: 64 bits

 *

 * endian is:

 * (empty): target cpu endianness or 8 bit access

 *   r    : reversed target cpu endianness (not implemented yet)

 *   be   : big endian (not implemented yet)

 *   le   : little endian (not implemented yet)

 *

 * access_type is:

 *   raw    : host memory access

 *   user   : user mode access using soft MMU

 *   kernel : kernel mode access using soft MMU

 */

static inline int ldub_p(const void *ptr)

{

    return *(uint8_t *)ptr;

}

static inline int ldsb_p(const void *ptr)

{

    return *(int8_t *)ptr;

}

static inline void stb_p(void *ptr, int v)

{

    *(uint8_t *)ptr = v;

}

/* NOTE: on arm, putting 2 in /proc/sys/debug/alignment so that the

   kernel handles unaligned load/stores may give better results, but

   it is a system wide setting : bad */

#if defined(HOST_WORDS_BIGENDIAN) || defined(WORDS_ALIGNED)

/* conservative code for little endian unaligned accesses */

static inline int lduw_le_p(const void *ptr)

{

#ifdef _ARCH_PPC

    int val;

    __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (ptr));

    return val;

#else

    const uint8_t *p = ptr;

    return p[0] | (p[1] << 8);

#endif

}

static inline int ldsw_le_p(const void *ptr)

{

#ifdef _ARCH_PPC

    int val;

    __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (ptr));

    return (int16_t)val;

#else

    const uint8_t *p = ptr;

    return (int16_t)(p[0] | (p[1] << 8));

#endif

}

static inline int ldl_le_p(const void *ptr)

{

#ifdef _ARCH_PPC

    int val;

    __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (ptr));

    return val;

#else

    const uint8_t *p = ptr;

    return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);

#endif

}

static inline uint64_t ldq_le_p(const void *ptr)

{

    const uint8_t *p = ptr;

    uint32_t v1, v2;

    v1 = ldl_le_p(p);

    v2 = ldl_le_p(p + 4);

    return v1 | ((uint64_t)v2 << 32);

}

static inline void stw_le_p(void *ptr, int v)

{

#ifdef _ARCH_PPC

    __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*(uint16_t *)ptr) : "r" (v), "r" (ptr));

#else

    uint8_t *p = ptr;

    p[0] = v;

    p[1] = v >> 8;

#endif

}

static inline void stl_le_p(void *ptr, int v)

{

#ifdef _ARCH_PPC

    __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*(uint32_t *)ptr) : "r" (v), "r" (ptr));

#else

    uint8_t *p = ptr;

    p[0] = v;

    p[1] = v >> 8;

    p[2] = v >> 16;

    p[3] = v >> 24;

#endif

}

static inline void stq_le_p(void *ptr, uint64_t v)

{

    uint8_t *p = ptr;

    stl_le_p(p, (uint32_t)v);

    stl_le_p(p + 4, v >> 32);

}

/* float access */

static inline float32 ldfl_le_p(const void *ptr)

{

    union {

        float32 f;

        uint32_t i;

    } u;

    u.i = ldl_le_p(ptr);

    return u.f;

}

static inline void stfl_le_p(void *ptr, float32 v)

{

    union {

        float32 f;

        uint32_t i;

    } u;

    u.f = v;

    stl_le_p(ptr, u.i);

}

static inline float64 ldfq_le_p(const void *ptr)

{

    CPU_DoubleU u;

    u.l.lower = ldl_le_p(ptr);

    u.l.upper = ldl_le_p(ptr + 4);

    return u.d;

}

static inline void stfq_le_p(void *ptr, float64 v)

{

    CPU_DoubleU u;

    u.d = v;

    stl_le_p(ptr, u.l.lower);

    stl_le_p(ptr + 4, u.l.upper);

}

#else

static inline int lduw_le_p(const void *ptr)

{

    return *(uint16_t *)ptr;

}

static inline int ldsw_le_p(const void *ptr)

{

    return *(int16_t *)ptr;

}

static inline int ldl_le_p(const void *ptr)

{

    return *(uint32_t *)ptr;

}

static inline uint64_t ldq_le_p(const void *ptr)

{

    return *(uint64_t *)ptr;

}

static inline void stw_le_p(void *ptr, int v)

{

    *(uint16_t *)ptr = v;

}

static inline void stl_le_p(void *ptr, int v)

{

    *(uint32_t *)ptr = v;

}

static inline void stq_le_p(void *ptr, uint64_t v)

{

    *(uint64_t *)ptr = v;

}

/* float access */

static inline float32 ldfl_le_p(const void *ptr)

{

    return *(float32 *)ptr;

}

static inline float64 ldfq_le_p(const void *ptr)

{

    return *(float64 *)ptr;

}

static inline void stfl_le_p(void *ptr, float32 v)

{

    *(float32 *)ptr = v;

}

static inline void stfq_le_p(void *ptr, float64 v)

{

    *(float64 *)ptr = v;

}

#endif

#if !defined(HOST_WORDS_BIGENDIAN) || defined(WORDS_ALIGNED)

static inline int lduw_be_p(const void *ptr)

{

#if defined(__i386__)

    int val;

    asm volatile ("movzwl %1, %0\n"

                  "xchgb %b0, %h0\n"

                  : "=q" (val)

                  : "m" (*(uint16_t *)ptr));

    return val;

#else

    const uint8_t *b = ptr;

    return ((b[0] << 8) | b[1]);

#endif

}

static inline int ldsw_be_p(const void *ptr)

{

#if defined(__i386__)

    int val;

    asm volatile ("movzwl %1, %0\n"

                  "xchgb %b0, %h0\n"

                  : "=q" (val)

                  : "m" (*(uint16_t *)ptr));

    return (int16_t)val;

#else

    const uint8_t *b = ptr;

    return (int16_t)((b[0] << 8) | b[1]);

#endif

}

static inline int ldl_be_p(const void *ptr)

{

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

    int val;

    asm volatile ("movl %1, %0\n"

                  "bswap %0\n"

                  : "=r" (val)

                  : "m" (*(uint32_t *)ptr));

    return val;

#else

    const uint8_t *b = ptr;

    return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3];

#endif

}

static inline uint64_t ldq_be_p(const void *ptr)

{

    uint32_t a,b;

    a = ldl_be_p(ptr);

    b = ldl_be_p((uint8_t *)ptr + 4);

    return (((uint64_t)a<<32)|b);

}

static inline void stw_be_p(void *ptr, int v)

{

#if defined(__i386__)

    asm volatile ("xchgb %b0, %h0\n"

                  "movw %w0, %1\n"

                  : "=q" (v)

                  : "m" (*(uint16_t *)ptr), "0" (v));

#else

    uint8_t *d = (uint8_t *) ptr;

    d[0] = v >> 8;

    d[1] = v;

#endif

}

static inline void stl_be_p(void *ptr, int v)

{

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

    asm volatile ("bswap %0\n"

                  "movl %0, %1\n"

                  : "=r" (v)

                  : "m" (*(uint32_t *)ptr), "0" (v));

#else

    uint8_t *d = (uint8_t *) ptr;

    d[0] = v >> 24;

    d[1] = v >> 16;

    d[2] = v >> 8;

    d[3] = v;

#endif

}

static inline void stq_be_p(void *ptr, uint64_t v)

{

    stl_be_p(ptr, v >> 32);

    stl_be_p((uint8_t *)ptr + 4, v);

}

/* float access */

static inline float32 ldfl_be_p(const void *ptr)

{

    union {

        float32 f;

        uint32_t i;

    } u;

    u.i = ldl_be_p(ptr);

    return u.f;

}

static inline void stfl_be_p(void *ptr, float32 v)

{

    union {

        float32 f;

        uint32_t i;

    } u;

    u.f = v;

    stl_be_p(ptr, u.i);

}

static inline float64 ldfq_be_p(const void *ptr)

{

    CPU_DoubleU u;

    u.l.upper = ldl_be_p(ptr);

    u.l.lower = ldl_be_p((uint8_t *)ptr + 4);

    return u.d;

}

static inline void stfq_be_p(void *ptr, float64 v)

{

    CPU_DoubleU u;

    u.d = v;

    stl_be_p(ptr, u.l.upper);

    stl_be_p((uint8_t *)ptr + 4, u.l.lower);

}

#else

static inline int lduw_be_p(const void *ptr)

{

    return *(uint16_t *)ptr;

}

static inline int ldsw_be_p(const void *ptr)

{

    return *(int16_t *)ptr;

}

static inline int ldl_be_p(const void *ptr)

{

    return *(uint32_t *)ptr;

}

static inline uint64_t ldq_be_p(const void *ptr)

{

    return *(uint64_t *)ptr;

}

static inline void stw_be_p(void *ptr, int v)

{

    *(uint16_t *)ptr = v;

}

static inline void stl_be_p(void *ptr, int v)

{

    *(uint32_t *)ptr = v;

}

static inline void stq_be_p(void *ptr, uint64_t v)

{

    *(uint64_t *)ptr = v;

}

/* float access */

static inline float32 ldfl_be_p(const void *ptr)

{

    return *(float32 *)ptr;

}

static inline float64 ldfq_be_p(const void *ptr)

{

    return *(float64 *)ptr;

}

static inline void stfl_be_p(void *ptr, float32 v)

{

    *(float32 *)ptr = v;

}

static inline void stfq_be_p(void *ptr, float64 v)

{

    *(float64 *)ptr = v;

}

#endif

/* target CPU memory access functions */

#if defined(TARGET_WORDS_BIGENDIAN)

#define lduw_p(p) lduw_be_p(p)

#define ldsw_p(p) ldsw_be_p(p)

#define ldl_p(p) ldl_be_p(p)

#define ldq_p(p) ldq_be_p(p)

#define ldfl_p(p) ldfl_be_p(p)

#define ldfq_p(p) ldfq_be_p(p)

#define stw_p(p, v) stw_be_p(p, v)

#define stl_p(p, v) stl_be_p(p, v)

#define stq_p(p, v) stq_be_p(p, v)

#define stfl_p(p, v) stfl_be_p(p, v)

#define stfq_p(p, v) stfq_be_p(p, v)

#else

#define lduw_p(p) lduw_le_p(p)

#define ldsw_p(p) ldsw_le_p(p)

#define ldl_p(p) ldl_le_p(p)

#define ldq_p(p) ldq_le_p(p)

#define ldfl_p(p) ldfl_le_p(p)

#define ldfq_p(p) ldfq_le_p(p)

#define stw_p(p, v) stw_le_p(p, v)

#define stl_p(p, v) stl_le_p(p, v)

#define stq_p(p, v) stq_le_p(p, v)

#define stfl_p(p, v) stfl_le_p(p, v)

#define stfq_p(p, v) stfq_le_p(p, v)

#endif

/* MMU memory access macros */

#if defined(CONFIG_USER_ONLY)

#include <assert.h>

#include "qemu-types.h"

/* On some host systems the guest address space is reserved on the host.

 * This allows the guest address space to be offset to a convenient location.

 */

#if defined(CONFIG_USE_GUEST_BASE)

extern unsigned long guest_base;

extern int have_guest_base;

#define GUEST_BASE guest_base

#else

#define GUEST_BASE 0ul

#endif

/* All direct uses of g2h and h2g need to go away for usermode softmmu.  */

#define g2h(x) ((void *)((unsigned long)(x) + GUEST_BASE))

#define h2g(x) ({ \

    unsigned long __ret = (unsigned long)(x) - GUEST_BASE; \

    /* Check if given address fits target address space */ \

    assert(__ret == (abi_ulong)__ret); \

    (abi_ulong)__ret; \

})

#define h2g_valid(x) ({ \

    unsigned long __guest = (unsigned long)(x) - GUEST_BASE; \

    (__guest == (abi_ulong)__guest); \

})

#define saddr(x) g2h(x)

#define laddr(x) g2h(x)

#else /* !CONFIG_USER_ONLY */

/* NOTE: we use double casts if pointers and target_ulong have

   different sizes */

#define saddr(x) (uint8_t *)(long)(x)

#define laddr(x) (uint8_t *)(long)(x)

#endif

#define ldub_raw(p) ldub_p(laddr((p)))

#define ldsb_raw(p) ldsb_p(laddr((p)))

#define lduw_raw(p) lduw_p(laddr((p)))

#define ldsw_raw(p) ldsw_p(laddr((p)))

#define ldl_raw(p) ldl_p(laddr((p)))

#define ldq_raw(p) ldq_p(laddr((p)))

#define ldfl_raw(p) ldfl_p(laddr((p)))

#define ldfq_raw(p) ldfq_p(laddr((p)))

#define stb_raw(p, v) stb_p(saddr((p)), v)

#define stw_raw(p, v) stw_p(saddr((p)), v)

#define stl_raw(p, v) stl_p(saddr((p)), v)

#define stq_raw(p, v) stq_p(saddr((p)), v)

#define stfl_raw(p, v) stfl_p(saddr((p)), v)

#define stfq_raw(p, v) stfq_p(saddr((p)), v)

#if defined(CONFIG_USER_ONLY)

/* if user mode, no other memory access functions */

#define ldub(p) ldub_raw(p)

#define ldsb(p) ldsb_raw(p)

#define lduw(p) lduw_raw(p)

#define ldsw(p) ldsw_raw(p)

#define ldl(p) ldl_raw(p)

#define ldq(p) ldq_raw(p)

#define ldfl(p) ldfl_raw(p)

#define ldfq(p) ldfq_raw(p)

#define stb(p, v) stb_raw(p, v)

#define stw(p, v) stw_raw(p, v)

#define stl(p, v) stl_raw(p, v)

#define stq(p, v) stq_raw(p, v)

#define stfl(p, v) stfl_raw(p, v)

#define stfq(p, v) stfq_raw(p, v)

#define ldub_code(p) ldub_raw(p)

#define ldsb_code(p) ldsb_raw(p)

#define lduw_code(p) lduw_raw(p)

#define ldsw_code(p) ldsw_raw(p)

#define ldl_code(p) ldl_raw(p)

#define ldq_code(p) ldq_raw(p)

#define ldub_kernel(p) ldub_raw(p)

#define ldsb_kernel(p) ldsb_raw(p)

#define lduw_kernel(p) lduw_raw(p)

#define ldsw_kernel(p) ldsw_raw(p)

#define ldl_kernel(p) ldl_raw(p)

#define ldq_kernel(p) ldq_raw(p)

#define ldfl_kernel(p) ldfl_raw(p)

#define ldfq_kernel(p) ldfq_raw(p)

#define stb_kernel(p, v) stb_raw(p, v)

#define stw_kernel(p, v) stw_raw(p, v)

#define stl_kernel(p, v) stl_raw(p, v)

#define stq_kernel(p, v) stq_raw(p, v)

#define stfl_kernel(p, v) stfl_raw(p, v)

#define stfq_kernel(p, vt) stfq_raw(p, v)

#endif /* defined(CONFIG_USER_ONLY) */

/* page related stuff */

#define TARGET_PAGE_SIZE (1 << TARGET_PAGE_BITS)

#define TARGET_PAGE_MASK ~(TARGET_PAGE_SIZE - 1)

#define TARGET_PAGE_ALIGN(addr) (((addr) + TARGET_PAGE_SIZE - 1) & TARGET_PAGE_MASK)

/* ??? These should be the larger of unsigned long and target_ulong.  */

extern unsigned long qemu_real_host_page_size;

extern unsigned long qemu_host_page_bits;

extern unsigned long qemu_host_page_size;

extern unsigned long qemu_host_page_mask;

#define HOST_PAGE_ALIGN(addr) (((addr) + qemu_host_page_size - 1) & qemu_host_page_mask)

/* same as PROT_xxx */

#define PAGE_READ      0x0001

#define PAGE_WRITE     0x0002

#define PAGE_EXEC      0x0004

#define PAGE_BITS      (PAGE_READ | PAGE_WRITE | PAGE_EXEC)

#define PAGE_VALID     0x0008

/* original state of the write flag (used when tracking self-modifying

   code */

#define PAGE_WRITE_ORG 0x0010

#define PAGE_RESERVED  0x0020

void page_dump(FILE *f);

int walk_memory_regions(void *,

    int (*fn)(void *, unsigned long, unsigned long, unsigned long));

int page_get_flags(target_ulong address);

void page_set_flags(target_ulong start, target_ulong end, int flags);

int page_check_range(target_ulong start, target_ulong len, int flags);

void cpu_exec_init_all(unsigned long tb_size);

CPUState *cpu_copy(CPUState *env);

CPUState *qemu_get_cpu(int cpu);

void cpu_dump_state(CPUState *env, FILE *f,

                    int (*cpu_fprintf)(FILE *f, const char *fmt, ...),

                    int flags);

void cpu_dump_statistics (CPUState *env, FILE *f,

                          int (*cpu_fprintf)(FILE *f, const char *fmt, ...),

                          int flags);

void QEMU_NORETURN cpu_abort(CPUState *env, const char *fmt, ...)

    __attribute__ ((__format__ (__printf__, 2, 3)));

extern CPUState *first_cpu;

extern CPUState *cpu_single_env;

extern int64_t qemu_icount;

extern int use_icount;

#define CPU_INTERRUPT_HARD   0x02 /* hardware interrupt pending */

#define CPU_INTERRUPT_EXITTB 0x04 /* exit the current TB (use for x86 a20 case) */

#define CPU_INTERRUPT_TIMER  0x08 /* internal timer exception pending */

#define CPU_INTERRUPT_FIQ    0x10 /* Fast interrupt pending.  */

#define CPU_INTERRUPT_HALT   0x20 /* CPU halt wanted */

#define CPU_INTERRUPT_SMI    0x40 /* (x86 only) SMI interrupt pending */

#define CPU_INTERRUPT_DEBUG  0x80 /* Debug event occured.  */

#define CPU_INTERRUPT_VIRQ   0x100 /* virtual interrupt pending.  */

#define CPU_INTERRUPT_NMI    0x200 /* NMI pending. */

#define CPU_INTERRUPT_INIT   0x400 /* INIT pending. */

#define CPU_INTERRUPT_SIPI   0x800 /* SIPI pending. */

#define CPU_INTERRUPT_MCE    0x1000 /* (x86 only) MCE pending. */

void cpu_interrupt(CPUState *s, int mask);

void cpu_reset_interrupt(CPUState *env, int mask);

void cpu_exit(CPUState *s);

int qemu_cpu_has_work(CPUState *env);

/* Breakpoint/watchpoint flags */

#define BP_MEM_READ           0x01

#define BP_MEM_WRITE          0x02

#define BP_MEM_ACCESS         (BP_MEM_READ | BP_MEM_WRITE)

#define BP_STOP_BEFORE_ACCESS 0x04

#define BP_WATCHPOINT_HIT     0x08

#define BP_GDB                0x10

#define BP_CPU                0x20

int cpu_breakpoint_insert(CPUState *env, target_ulong pc, int flags,

                          CPUBreakpoint **breakpoint);

int cpu_breakpoint_remove(CPUState *env, target_ulong pc, int flags);

void cpu_breakpoint_remove_by_ref(CPUState *env, CPUBreakpoint *breakpoint);

void cpu_breakpoint_remove_all(CPUState *env, int mask);

int cpu_watchpoint_insert(CPUState *env, target_ulong addr, target_ulong len,

                          int flags, CPUWatchpoint **watchpoint);

int cpu_watchpoint_remove(CPUState *env, target_ulong addr,

                          target_ulong len, int flags);

void cpu_watchpoint_remove_by_ref(CPUState *env, CPUWatchpoint *watchpoint);

void cpu_watchpoint_remove_all(CPUState *env, int mask);

#define SSTEP_ENABLE  0x1  /* Enable simulated HW single stepping */

#define SSTEP_NOIRQ   0x2  /* Do not use IRQ while single stepping */

#define SSTEP_NOTIMER 0x4  /* Do not Timers while single stepping */

void cpu_single_step(CPUState *env, int enabled);

void cpu_reset(CPUState *s);

/* Return the physical page corresponding to a virtual one. Use it

   only for debugging because no protection checks are done. Return -1

   if no page found. */

target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr);

#define CPU_LOG_TB_OUT_ASM (1 << 0)

#define CPU_LOG_TB_IN_ASM  (1 << 1)

#define CPU_LOG_TB_OP      (1 << 2)

#define CPU_LOG_TB_OP_OPT  (1 << 3)

#define CPU_LOG_INT        (1 << 4)

#define CPU_LOG_EXEC       (1 << 5)

#define CPU_LOG_PCALL      (1 << 6)

#define CPU_LOG_IOPORT     (1 << 7)

#define CPU_LOG_TB_CPU     (1 << 8)

#define CPU_LOG_RESET      (1 << 9)

/* define log items */

typedef struct CPULogItem {

    int mask;

    const char *name;

    const char *help;

} CPULogItem;

extern const CPULogItem cpu_log_items[];

void cpu_set_log(int log_flags);

void cpu_set_log_filename(const char *filename);

int cpu_str_to_log_mask(const char *str);

/* IO ports API */

#include "ioport.h"

/* memory API */

extern int phys_ram_fd;

extern uint8_t *phys_ram_dirty;

extern ram_addr_t ram_size;

extern ram_addr_t last_ram_offset;

/* physical memory access */

/* MMIO pages are identified by a combination of an IO device index and

   3 flags.  The ROMD code stores the page ram offset in iotlb entry, 

   so only a limited number of ids are avaiable.  */

#define IO_MEM_NB_ENTRIES  (1 << (TARGET_PAGE_BITS  - IO_MEM_SHIFT))

/* Flags stored in the low bits of the TLB virtual address.  These are