qemu.h

qemu虚拟机代码

#ifndef QEMU_H
#define QEMU_H

#include "thunk.h"

#include <signal.h>
#include <string.h>
#include "syscall_defs.h"

#include "cpu.h"
#include "syscall.h"
#include "gdbstub.h"

/* This struct is used to hold certain information about the image.
 * Basically, it replicates in user space what would be certain
 * task_struct fields in the kernel
 */
struct image_info {
	unsigned long	start_code;
	unsigned long	end_code;
	unsigned long	end_data;
	unsigned long	start_brk;
	unsigned long	brk;
	unsigned long	start_mmap;
	unsigned long	mmap;
	unsigned long	rss;
	unsigned long	start_stack;
	unsigned long	arg_start;
	unsigned long	arg_end;
	unsigned long	env_start;
	unsigned long	env_end;
	unsigned long	entry;
	int		personality;
};

#ifdef TARGET_I386
/* Information about the current linux thread */
struct vm86_saved_state {
    uint32_t eax; /* return code */
    uint32_t ebx;
    uint32_t ecx;
    uint32_t edx;
    uint32_t esi;
    uint32_t edi;
    uint32_t ebp;
    uint32_t esp;
    uint32_t eflags;
    uint32_t eip;
    uint16_t cs, ss, ds, es, fs, gs;
};
#endif

#ifdef TARGET_ARM
/* FPU emulator */
#include "nwfpe/fpa11.h"
#endif

/* NOTE: we force a big alignment so that the stack stored after is
   aligned too */
typedef struct TaskState {
    struct TaskState *next;
#ifdef TARGET_ARM
    /* FPA state */
    FPA11 fpa;
    /* Extra fields for semihosted binaries.  */
    uint32_t stack_base;
    uint32_t heap_base;
    uint32_t heap_limit;
    int swi_errno;
#endif
#ifdef TARGET_I386
    target_ulong target_v86;
    struct vm86_saved_state vm86_saved_regs;
    struct target_vm86plus_struct vm86plus;
    uint32_t v86flags;
    uint32_t v86mask;
#endif
    int used; /* non zero if used */
    uint8_t stack[0];
} __attribute__((aligned(16))) TaskState;

extern TaskState *first_task_state;

int elf_exec(const char * filename, char ** argv, char ** envp, 
             struct target_pt_regs * regs, struct image_info *infop);

void target_set_brk(target_ulong new_brk);
long do_brk(target_ulong new_brk);
void syscall_init(void);
long do_syscall(void *cpu_env, int num, long arg1, long arg2, long arg3, 
                long arg4, long arg5, long arg6);
void gemu_log(const char *fmt, ...) __attribute__((format(printf,1,2)));
extern CPUState *global_env;
void cpu_loop(CPUState *env);
void init_paths(const char *prefix);
const char *path(const char *pathname);

extern int loglevel;
extern FILE *logfile;

/* signal.c */
void process_pending_signals(void *cpu_env);
void signal_init(void);
int queue_signal(int sig, target_siginfo_t *info);
void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
long do_sigreturn(CPUState *env);
long do_rt_sigreturn(CPUState *env);

#ifdef TARGET_I386
/* vm86.c */
void save_v86_state(CPUX86State *env);
void handle_vm86_trap(CPUX86State *env, int trapno);
void handle_vm86_fault(CPUX86State *env);
int do_vm86(CPUX86State *env, long subfunction, target_ulong v86_addr);
#endif

/* mmap.c */
int target_mprotect(target_ulong start, target_ulong len, int prot);
long target_mmap(target_ulong start, target_ulong len, int prot, 
                 int flags, int fd, target_ulong offset);
int target_munmap(target_ulong start, target_ulong len);
long target_mremap(target_ulong old_addr, target_ulong old_size, 
                   target_ulong new_size, unsigned long flags,
                   target_ulong new_addr);
int target_msync(target_ulong start, target_ulong len, int flags);

/* user access */

#define VERIFY_READ 0
#define VERIFY_WRITE 1

#define access_ok(type,addr,size) (1)

/* NOTE get_user and put_user use host addresses.  */
#define __put_user(x,ptr)\
({\
    int size = sizeof(*ptr);\
    switch(size) {\
    case 1:\
        *(uint8_t *)(ptr) = (typeof(*ptr))(x);\
        break;\
    case 2:\
        *(uint16_t *)(ptr) = tswap16((typeof(*ptr))(x));\
        break;\
    case 4:\
        *(uint32_t *)(ptr) = tswap32((typeof(*ptr))(x));\
        break;\
    case 8:\
        *(uint64_t *)(ptr) = tswap64((typeof(*ptr))(x));\
        break;\
    default:\
        abort();\
    }\
    0;\
})

#define __get_user(x, ptr) \
({\
    int size = sizeof(*ptr);\
    switch(size) {\
    case 1:\
        x = (typeof(*ptr))*(uint8_t *)(ptr);\
        break;\
    case 2:\
        x = (typeof(*ptr))tswap16(*(uint16_t *)(ptr));\
        break;\
    case 4:\
        x = (typeof(*ptr))tswap32(*(uint32_t *)(ptr));\
        break;\
    case 8:\
        x = (typeof(*ptr))tswap64(*(uint64_t *)(ptr));\
        break;\
    default:\
        abort();\
    }\
    0;\
})

#define put_user(x,ptr)\
({\
    int __ret;\
    if (access_ok(VERIFY_WRITE, ptr, sizeof(*ptr)))\
        __ret = __put_user(x, ptr);\
    else\
        __ret = -EFAULT;\
    __ret;\
})

#define get_user(x,ptr)\
({\
    int __ret;\
    if (access_ok(VERIFY_READ, ptr, sizeof(*ptr)))\
        __ret = __get_user(x, ptr);\
    else\
        __ret = -EFAULT;\
    __ret;\
})

/* Functions for accessing guest memory.  The tget and tput functions
   read/write single values, byteswapping as neccessary.  The lock_user
   gets a pointer to a contiguous area of guest memory, but does not perform
   and byteswapping.  lock_user may return either a pointer to the guest
   memory, or a temporary buffer.  */

/* Lock an area of guest memory into the host.  If copy is true then the
   host area will have the same contents as the guest.  */
static inline void *lock_user(target_ulong guest_addr, long len, int copy)
{
#ifdef DEBUG_REMAP
    void *addr;
    addr = malloc(len);
    if (copy)
        memcpy(addr, g2h(guest_addr), len);
    else
        memset(addr, 0, len);
    return addr;
#else
    return g2h(guest_addr);
#endif
}

/* Unlock an area of guest memory.  The first LEN bytes must be flushed back
   to guest memory.  */
static inline void unlock_user(void *host_addr, target_ulong guest_addr,
                                long len)
{
#ifdef DEBUG_REMAP
    if (host_addr == g2h(guest_addr))
        return;
    if (len > 0)
        memcpy(g2h(guest_addr), host_addr, len);
    free(host_addr);
#endif
}

/* Return the length of a string in target memory.  */
static inline int target_strlen(target_ulong ptr)
{
  return strlen(g2h(ptr));
}

/* Like lock_user but for null terminated strings.  */
static inline void *lock_user_string(target_ulong guest_addr)
{
    long len;
    len = target_strlen(guest_addr) + 1;
    return lock_user(guest_addr, len, 1);
}

/* Helper macros for locking/ulocking a target struct.  */
#define lock_user_struct(host_ptr, guest_addr, copy) \
    host_ptr = lock_user(guest_addr, sizeof(*host_ptr), copy)
#define unlock_user_struct(host_ptr, guest_addr, copy) \
    unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)

#define tget8(addr) ldub(addr)
#define tput8(addr, val) stb(addr, val)
#define tget16(addr) lduw(addr)
#define tput16(addr, val) stw(addr, val)
#define tget32(addr) ldl(addr)
#define tput32(addr, val) stl(addr, val)
#define tget64(addr) ldq(addr)
#define tput64(addr, val) stq(addr, val)
#if TARGET_LONG_BITS == 64
#define tgetl(addr) ldq(addr)
#define tputl(addr, val) stq(addr, val)
#else
#define tgetl(addr) ldl(addr)
#define tputl(addr, val) stl(addr, val)
#endif

#endif /* QEMU_H */