aboutsummaryrefslogtreecommitdiff
path: root/linux-user/qemu.h
blob: e92db6ee644264b8eae07499a7c057784d6f872c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
#ifndef QEMU_H
#define QEMU_H

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

#include "cpu.h"

#ifdef TARGET_ABI32
typedef uint32_t abi_ulong;
typedef int32_t abi_long;
#define TARGET_ABI_BITS 32
#else
typedef target_ulong abi_ulong;
typedef target_long abi_long;
#define TARGET_ABI_BITS TARGET_LONG_BITS
#endif

#include "thunk.h"
#include "syscall_defs.h"
#include "syscall.h"
#include "target_signal.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 {
        abi_ulong       load_addr;
        abi_ulong       start_code;
        abi_ulong       end_code;
        abi_ulong       start_data;
        abi_ulong       end_data;
        abi_ulong       start_brk;
        abi_ulong       brk;
        abi_ulong       start_mmap;
        abi_ulong       mmap;
        abi_ulong       rss;
        abi_ulong       start_stack;
        abi_ulong       entry;
        abi_ulong       code_offset;
        abi_ulong       data_offset;
        char            **host_argv;
	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;
    int swi_errno;
#endif
#if defined(TARGET_I386) && !defined(TARGET_X86_64)
    abi_ulong target_v86;
    struct vm86_saved_state vm86_saved_regs;
    struct target_vm86plus_struct vm86plus;
    uint32_t v86flags;
    uint32_t v86mask;
#endif
#ifdef TARGET_M68K
    int sim_syscalls;
#endif
#if defined(TARGET_ARM) || defined(TARGET_M68K)
    /* Extra fields for semihosted binaries.  */
    uint32_t stack_base;
    uint32_t heap_base;
    uint32_t heap_limit;
#endif
    int used; /* non zero if used */
    struct image_info *info;
    uint8_t stack[0];
} __attribute__((aligned(16))) TaskState;

extern TaskState *first_task_state;
extern const char *qemu_uname_release;

/* ??? See if we can avoid exposing so much of the loader internals.  */
/*
 * MAX_ARG_PAGES defines the number of pages allocated for arguments
 * and envelope for the new program. 32 should suffice, this gives
 * a maximum env+arg of 128kB w/4KB pages!
 */
#define MAX_ARG_PAGES 32

/*
 * This structure is used to hold the arguments that are
 * used when loading binaries.
 */
struct linux_binprm {
        char buf[128];
        void *page[MAX_ARG_PAGES];
        abi_ulong p;
	int fd;
        int e_uid, e_gid;
        int argc, envc;
        char **argv;
        char **envp;
        char * filename;        /* Name of binary */
};

void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
                              abi_ulong stringp, int push_ptr);
int loader_exec(const char * filename, char ** argv, char ** envp,
             struct target_pt_regs * regs, struct image_info *infop);

int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
                    struct image_info * info);
int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
                    struct image_info * info);
#ifdef TARGET_HAS_ELFLOAD32
int load_elf_binary_multi(struct linux_binprm *bprm,
                          struct target_pt_regs *regs,
                          struct image_info *info);
#endif

void memcpy_to_target(abi_ulong dest, const void *src,
                      unsigned long len);
void target_set_brk(abi_ulong new_brk);
abi_long do_brk(abi_ulong new_brk);
void syscall_init(void);
abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
                    abi_long arg2, abi_long arg3, abi_long arg4,
                    abi_long arg5, abi_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);
int do_sigaltstack(const struct target_sigaltstack *uss,
                   struct target_sigaltstack *uoss,
                   abi_ulong sp);

#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, abi_ulong v86_addr);
#elif defined(TARGET_SPARC64)
void sparc64_set_context(CPUSPARCState *env);
void sparc64_get_context(CPUSPARCState *env);
#endif

/* mmap.c */
int target_mprotect(abi_ulong start, abi_ulong len, int prot);
abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
                     int flags, int fd, abi_ulong offset);
int target_munmap(abi_ulong start, abi_ulong len);
abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
                       abi_ulong new_size, unsigned long flags,
                       abi_ulong new_addr);
int target_msync(abi_ulong start, abi_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(abi_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, abi_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(abi_ulong ptr)
{
  return strlen(g2h(ptr));
}

/* Like lock_user but for null terminated strings.  */
static inline void *lock_user_string(abi_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_ABI_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 */