xref: /openbmc/qemu/linux-user/qemu.h (revision b8bcf811)
1 #ifndef QEMU_H
2 #define QEMU_H
3 
4 #include <signal.h>
5 #include <string.h>
6 
7 #include "cpu.h"
8 
9 #undef DEBUG_REMAP
10 #ifdef DEBUG_REMAP
11 #include <stdlib.h>
12 #endif /* DEBUG_REMAP */
13 
14 #include "exec/user/abitypes.h"
15 
16 #include "exec/user/thunk.h"
17 #include "syscall_defs.h"
18 #include "syscall.h"
19 #include "exec/gdbstub.h"
20 #include "qemu/queue.h"
21 
22 #define THREAD __thread
23 
24 /* This struct is used to hold certain information about the image.
25  * Basically, it replicates in user space what would be certain
26  * task_struct fields in the kernel
27  */
28 struct image_info {
29         abi_ulong       load_bias;
30         abi_ulong       load_addr;
31         abi_ulong       start_code;
32         abi_ulong       end_code;
33         abi_ulong       start_data;
34         abi_ulong       end_data;
35         abi_ulong       start_brk;
36         abi_ulong       brk;
37         abi_ulong       start_mmap;
38         abi_ulong       mmap;
39         abi_ulong       rss;
40         abi_ulong       start_stack;
41         abi_ulong       stack_limit;
42         abi_ulong       entry;
43         abi_ulong       code_offset;
44         abi_ulong       data_offset;
45         abi_ulong       saved_auxv;
46         abi_ulong       auxv_len;
47         abi_ulong       arg_start;
48         abi_ulong       arg_end;
49         uint32_t        elf_flags;
50 	int		personality;
51 #ifdef CONFIG_USE_FDPIC
52         abi_ulong       loadmap_addr;
53         uint16_t        nsegs;
54         void           *loadsegs;
55         abi_ulong       pt_dynamic_addr;
56         struct image_info *other_info;
57 #endif
58 };
59 
60 #ifdef TARGET_I386
61 /* Information about the current linux thread */
62 struct vm86_saved_state {
63     uint32_t eax; /* return code */
64     uint32_t ebx;
65     uint32_t ecx;
66     uint32_t edx;
67     uint32_t esi;
68     uint32_t edi;
69     uint32_t ebp;
70     uint32_t esp;
71     uint32_t eflags;
72     uint32_t eip;
73     uint16_t cs, ss, ds, es, fs, gs;
74 };
75 #endif
76 
77 #if defined(TARGET_ARM) && defined(TARGET_ABI32)
78 /* FPU emulator */
79 #include "nwfpe/fpa11.h"
80 #endif
81 
82 #define MAX_SIGQUEUE_SIZE 1024
83 
84 struct sigqueue {
85     struct sigqueue *next;
86     target_siginfo_t info;
87 };
88 
89 struct emulated_sigtable {
90     int pending; /* true if signal is pending */
91     struct sigqueue *first;
92     struct sigqueue info; /* in order to always have memory for the
93                              first signal, we put it here */
94 };
95 
96 /* NOTE: we force a big alignment so that the stack stored after is
97    aligned too */
98 typedef struct TaskState {
99     pid_t ts_tid;     /* tid (or pid) of this task */
100 #ifdef TARGET_ARM
101 # ifdef TARGET_ABI32
102     /* FPA state */
103     FPA11 fpa;
104 # endif
105     int swi_errno;
106 #endif
107 #ifdef TARGET_UNICORE32
108     int swi_errno;
109 #endif
110 #if defined(TARGET_I386) && !defined(TARGET_X86_64)
111     abi_ulong target_v86;
112     struct vm86_saved_state vm86_saved_regs;
113     struct target_vm86plus_struct vm86plus;
114     uint32_t v86flags;
115     uint32_t v86mask;
116 #endif
117     abi_ulong child_tidptr;
118 #ifdef TARGET_M68K
119     int sim_syscalls;
120     abi_ulong tp_value;
121 #endif
122 #if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
123     /* Extra fields for semihosted binaries.  */
124     uint32_t heap_base;
125     uint32_t heap_limit;
126 #endif
127     uint32_t stack_base;
128     int used; /* non zero if used */
129     struct image_info *info;
130     struct linux_binprm *bprm;
131 
132     struct emulated_sigtable sigtab[TARGET_NSIG];
133     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
134     struct sigqueue *first_free; /* first free siginfo queue entry */
135     int signal_pending; /* non zero if a signal may be pending */
136 } __attribute__((aligned(16))) TaskState;
137 
138 extern char *exec_path;
139 void init_task_state(TaskState *ts);
140 void task_settid(TaskState *);
141 void stop_all_tasks(void);
142 extern const char *qemu_uname_release;
143 extern unsigned long mmap_min_addr;
144 
145 /* ??? See if we can avoid exposing so much of the loader internals.  */
146 /*
147  * MAX_ARG_PAGES defines the number of pages allocated for arguments
148  * and envelope for the new program. 32 should suffice, this gives
149  * a maximum env+arg of 128kB w/4KB pages!
150  */
151 #define MAX_ARG_PAGES 33
152 
153 /* Read a good amount of data initially, to hopefully get all the
154    program headers loaded.  */
155 #define BPRM_BUF_SIZE  1024
156 
157 /*
158  * This structure is used to hold the arguments that are
159  * used when loading binaries.
160  */
161 struct linux_binprm {
162         char buf[BPRM_BUF_SIZE] __attribute__((aligned));
163         void *page[MAX_ARG_PAGES];
164         abi_ulong p;
165 	int fd;
166         int e_uid, e_gid;
167         int argc, envc;
168         char **argv;
169         char **envp;
170         char * filename;        /* Name of binary */
171         int (*core_dump)(int, const CPUArchState *); /* coredump routine */
172 };
173 
174 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
175 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
176                               abi_ulong stringp, int push_ptr);
177 int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
178              struct target_pt_regs * regs, struct image_info *infop,
179              struct linux_binprm *);
180 
181 int load_elf_binary(struct linux_binprm *bprm, struct image_info *info);
182 int load_flt_binary(struct linux_binprm *bprm, struct image_info *info);
183 
184 abi_long memcpy_to_target(abi_ulong dest, const void *src,
185                           unsigned long len);
186 void target_set_brk(abi_ulong new_brk);
187 abi_long do_brk(abi_ulong new_brk);
188 void syscall_init(void);
189 abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
190                     abi_long arg2, abi_long arg3, abi_long arg4,
191                     abi_long arg5, abi_long arg6, abi_long arg7,
192                     abi_long arg8);
193 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
194 extern THREAD CPUState *thread_cpu;
195 void cpu_loop(CPUArchState *env);
196 char *target_strerror(int err);
197 int get_osversion(void);
198 void init_qemu_uname_release(void);
199 void fork_start(void);
200 void fork_end(int child);
201 
202 /* Creates the initial guest address space in the host memory space using
203  * the given host start address hint and size.  The guest_start parameter
204  * specifies the start address of the guest space.  guest_base will be the
205  * difference between the host start address computed by this function and
206  * guest_start.  If fixed is specified, then the mapped address space must
207  * start at host_start.  The real start address of the mapped memory space is
208  * returned or -1 if there was an error.
209  */
210 unsigned long init_guest_space(unsigned long host_start,
211                                unsigned long host_size,
212                                unsigned long guest_start,
213                                bool fixed);
214 
215 #include "qemu/log.h"
216 
217 /* syscall.c */
218 int host_to_target_waitstatus(int status);
219 
220 /* strace.c */
221 void print_syscall(int num,
222                    abi_long arg1, abi_long arg2, abi_long arg3,
223                    abi_long arg4, abi_long arg5, abi_long arg6);
224 void print_syscall_ret(int num, abi_long arg1);
225 extern int do_strace;
226 
227 /* signal.c */
228 void process_pending_signals(CPUArchState *cpu_env);
229 void signal_init(void);
230 int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
231 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
232 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
233 int target_to_host_signal(int sig);
234 int host_to_target_signal(int sig);
235 long do_sigreturn(CPUArchState *env);
236 long do_rt_sigreturn(CPUArchState *env);
237 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
238 
239 #ifdef TARGET_I386
240 /* vm86.c */
241 void save_v86_state(CPUX86State *env);
242 void handle_vm86_trap(CPUX86State *env, int trapno);
243 void handle_vm86_fault(CPUX86State *env);
244 int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
245 #elif defined(TARGET_SPARC64)
246 void sparc64_set_context(CPUSPARCState *env);
247 void sparc64_get_context(CPUSPARCState *env);
248 #endif
249 
250 /* mmap.c */
251 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
252 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
253                      int flags, int fd, abi_ulong offset);
254 int target_munmap(abi_ulong start, abi_ulong len);
255 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
256                        abi_ulong new_size, unsigned long flags,
257                        abi_ulong new_addr);
258 int target_msync(abi_ulong start, abi_ulong len, int flags);
259 extern unsigned long last_brk;
260 extern abi_ulong mmap_next_start;
261 void mmap_lock(void);
262 void mmap_unlock(void);
263 abi_ulong mmap_find_vma(abi_ulong, abi_ulong);
264 void cpu_list_lock(void);
265 void cpu_list_unlock(void);
266 void mmap_fork_start(void);
267 void mmap_fork_end(int child);
268 
269 /* main.c */
270 extern unsigned long guest_stack_size;
271 
272 /* user access */
273 
274 #define VERIFY_READ 0
275 #define VERIFY_WRITE 1 /* implies read access */
276 
277 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
278 {
279     return page_check_range((target_ulong)addr, size,
280                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
281 }
282 
283 /* NOTE __get_user and __put_user use host pointers and don't check access.
284    These are usually used to access struct data members once the struct has
285    been locked - usually with lock_user_struct.  */
286 
287 /* Tricky points:
288    - Use __builtin_choose_expr to avoid type promotion from ?:,
289    - Invalid sizes result in a compile time error stemming from
290      the fact that abort has no parameters.
291    - It's easier to use the endian-specific unaligned load/store
292      functions than host-endian unaligned load/store plus tswapN.  */
293 
294 #define __put_user_e(x, hptr, e)                                        \
295   (__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p,                   \
296    __builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p,             \
297    __builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p,             \
298    __builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort))))   \
299      ((hptr), (x)), 0)
300 
301 #define __get_user_e(x, hptr, e)                                        \
302   ((x) = (typeof(*hptr))(                                               \
303    __builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p,                  \
304    __builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p,            \
305    __builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p,             \
306    __builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort))))   \
307      (hptr)), 0)
308 
309 #ifdef TARGET_WORDS_BIGENDIAN
310 # define __put_user(x, hptr)  __put_user_e(x, hptr, be)
311 # define __get_user(x, hptr)  __get_user_e(x, hptr, be)
312 #else
313 # define __put_user(x, hptr)  __put_user_e(x, hptr, le)
314 # define __get_user(x, hptr)  __get_user_e(x, hptr, le)
315 #endif
316 
317 /* put_user()/get_user() take a guest address and check access */
318 /* These are usually used to access an atomic data type, such as an int,
319  * that has been passed by address.  These internally perform locking
320  * and unlocking on the data type.
321  */
322 #define put_user(x, gaddr, target_type)					\
323 ({									\
324     abi_ulong __gaddr = (gaddr);					\
325     target_type *__hptr;						\
326     abi_long __ret;							\
327     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
328         __ret = __put_user((x), __hptr);				\
329         unlock_user(__hptr, __gaddr, sizeof(target_type));		\
330     } else								\
331         __ret = -TARGET_EFAULT;						\
332     __ret;								\
333 })
334 
335 #define get_user(x, gaddr, target_type)					\
336 ({									\
337     abi_ulong __gaddr = (gaddr);					\
338     target_type *__hptr;						\
339     abi_long __ret;							\
340     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
341         __ret = __get_user((x), __hptr);				\
342         unlock_user(__hptr, __gaddr, 0);				\
343     } else {								\
344         /* avoid warning */						\
345         (x) = 0;							\
346         __ret = -TARGET_EFAULT;						\
347     }									\
348     __ret;								\
349 })
350 
351 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
352 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
353 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
354 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
355 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
356 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
357 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
358 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
359 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
360 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
361 
362 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
363 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
364 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
365 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
366 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
367 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
368 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
369 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
370 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
371 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
372 
373 /* copy_from_user() and copy_to_user() are usually used to copy data
374  * buffers between the target and host.  These internally perform
375  * locking/unlocking of the memory.
376  */
377 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
378 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
379 
380 /* Functions for accessing guest memory.  The tget and tput functions
381    read/write single values, byteswapping as necessary.  The lock_user function
382    gets a pointer to a contiguous area of guest memory, but does not perform
383    any byteswapping.  lock_user may return either a pointer to the guest
384    memory, or a temporary buffer.  */
385 
386 /* Lock an area of guest memory into the host.  If copy is true then the
387    host area will have the same contents as the guest.  */
388 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
389 {
390     if (!access_ok(type, guest_addr, len))
391         return NULL;
392 #ifdef DEBUG_REMAP
393     {
394         void *addr;
395         addr = malloc(len);
396         if (copy)
397             memcpy(addr, g2h(guest_addr), len);
398         else
399             memset(addr, 0, len);
400         return addr;
401     }
402 #else
403     return g2h(guest_addr);
404 #endif
405 }
406 
407 /* Unlock an area of guest memory.  The first LEN bytes must be
408    flushed back to guest memory. host_ptr = NULL is explicitly
409    allowed and does nothing. */
410 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
411                                long len)
412 {
413 
414 #ifdef DEBUG_REMAP
415     if (!host_ptr)
416         return;
417     if (host_ptr == g2h(guest_addr))
418         return;
419     if (len > 0)
420         memcpy(g2h(guest_addr), host_ptr, len);
421     free(host_ptr);
422 #endif
423 }
424 
425 /* Return the length of a string in target memory or -TARGET_EFAULT if
426    access error. */
427 abi_long target_strlen(abi_ulong gaddr);
428 
429 /* Like lock_user but for null terminated strings.  */
430 static inline void *lock_user_string(abi_ulong guest_addr)
431 {
432     abi_long len;
433     len = target_strlen(guest_addr);
434     if (len < 0)
435         return NULL;
436     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
437 }
438 
439 /* Helper macros for locking/unlocking a target struct.  */
440 #define lock_user_struct(type, host_ptr, guest_addr, copy)	\
441     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
442 #define unlock_user_struct(host_ptr, guest_addr, copy)		\
443     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
444 
445 #include <pthread.h>
446 
447 /* Include target-specific struct and function definitions;
448  * they may need access to the target-independent structures
449  * above, so include them last.
450  */
451 #include "target_cpu.h"
452 #include "target_signal.h"
453 #include "target_structs.h"
454 
455 #endif /* QEMU_H */
456