xref: /openbmc/qemu/bsd-user/qemu.h (revision 0c0c1fd9)
1 /*
2  *  qemu bsd user mode definition
3  *
4  *  This program is free software; you can redistribute it and/or modify
5  *  it under the terms of the GNU General Public License as published by
6  *  the Free Software Foundation; either version 2 of the License, or
7  *  (at your option) any later version.
8  *
9  *  This program is distributed in the hope that it will be useful,
10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  *  GNU General Public License for more details.
13  *
14  *  You should have received a copy of the GNU General Public License
15  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
16  */
17 #ifndef QEMU_H
18 #define QEMU_H
19 
20 
21 #include "cpu.h"
22 #include "exec/exec-all.h"
23 #include "exec/cpu_ldst.h"
24 
25 #undef DEBUG_REMAP
26 #ifdef DEBUG_REMAP
27 #endif /* DEBUG_REMAP */
28 
29 #include "exec/user/abitypes.h"
30 
31 enum BSDType {
32     target_freebsd,
33     target_netbsd,
34     target_openbsd,
35 };
36 extern enum BSDType bsd_type;
37 
38 #include "syscall_defs.h"
39 #include "target_syscall.h"
40 #include "target_signal.h"
41 #include "exec/gdbstub.h"
42 
43 #if defined(CONFIG_USE_NPTL)
44 #define THREAD __thread
45 #else
46 #define THREAD
47 #endif
48 
49 /* This struct is used to hold certain information about the image.
50  * Basically, it replicates in user space what would be certain
51  * task_struct fields in the kernel
52  */
53 struct image_info {
54     abi_ulong load_addr;
55     abi_ulong start_code;
56     abi_ulong end_code;
57     abi_ulong start_data;
58     abi_ulong end_data;
59     abi_ulong start_brk;
60     abi_ulong brk;
61     abi_ulong start_mmap;
62     abi_ulong mmap;
63     abi_ulong rss;
64     abi_ulong start_stack;
65     abi_ulong entry;
66     abi_ulong code_offset;
67     abi_ulong data_offset;
68     int       personality;
69 };
70 
71 #define MAX_SIGQUEUE_SIZE 1024
72 
73 struct sigqueue {
74     struct sigqueue *next;
75     //target_siginfo_t info;
76 };
77 
78 struct emulated_sigtable {
79     int pending; /* true if signal is pending */
80     struct sigqueue *first;
81     struct sigqueue info; /* in order to always have memory for the
82                              first signal, we put it here */
83 };
84 
85 /* NOTE: we force a big alignment so that the stack stored after is
86    aligned too */
87 typedef struct TaskState {
88     struct TaskState *next;
89     int used; /* non zero if used */
90     struct image_info *info;
91 
92     struct emulated_sigtable sigtab[TARGET_NSIG];
93     struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */
94     struct sigqueue *first_free; /* first free siginfo queue entry */
95     int signal_pending; /* non zero if a signal may be pending */
96 
97     uint8_t stack[0];
98 } __attribute__((aligned(16))) TaskState;
99 
100 void init_task_state(TaskState *ts);
101 extern const char *qemu_uname_release;
102 extern unsigned long mmap_min_addr;
103 
104 /* ??? See if we can avoid exposing so much of the loader internals.  */
105 /*
106  * MAX_ARG_PAGES defines the number of pages allocated for arguments
107  * and envelope for the new program. 32 should suffice, this gives
108  * a maximum env+arg of 128kB w/4KB pages!
109  */
110 #define MAX_ARG_PAGES 32
111 
112 /*
113  * This structure is used to hold the arguments that are
114  * used when loading binaries.
115  */
116 struct linux_binprm {
117         char buf[128];
118         void *page[MAX_ARG_PAGES];
119         abi_ulong p;
120         int fd;
121         int e_uid, e_gid;
122         int argc, envc;
123         char **argv;
124         char **envp;
125         char * filename;        /* Name of binary */
126 };
127 
128 void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
129 abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
130                               abi_ulong stringp, int push_ptr);
131 int loader_exec(const char * filename, char ** argv, char ** envp,
132              struct target_pt_regs * regs, struct image_info *infop);
133 
134 int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
135                     struct image_info * info);
136 int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
137                     struct image_info * info);
138 
139 abi_long memcpy_to_target(abi_ulong dest, const void *src,
140                           unsigned long len);
141 void target_set_brk(abi_ulong new_brk);
142 abi_long do_brk(abi_ulong new_brk);
143 void syscall_init(void);
144 abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
145                             abi_long arg2, abi_long arg3, abi_long arg4,
146                             abi_long arg5, abi_long arg6, abi_long arg7,
147                             abi_long arg8);
148 abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
149                            abi_long arg2, abi_long arg3, abi_long arg4,
150                            abi_long arg5, abi_long arg6);
151 abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
152                             abi_long arg2, abi_long arg3, abi_long arg4,
153                             abi_long arg5, abi_long arg6);
154 void gemu_log(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
155 extern THREAD CPUState *thread_cpu;
156 void cpu_loop(CPUArchState *env);
157 char *target_strerror(int err);
158 int get_osversion(void);
159 void fork_start(void);
160 void fork_end(int child);
161 
162 #include "qemu/log.h"
163 
164 /* strace.c */
165 struct syscallname {
166     int nr;
167     const char *name;
168     const char *format;
169     void (*call)(const struct syscallname *,
170                  abi_long, abi_long, abi_long,
171                  abi_long, abi_long, abi_long);
172     void (*result)(const struct syscallname *, abi_long);
173 };
174 
175 void
176 print_freebsd_syscall(int num,
177                       abi_long arg1, abi_long arg2, abi_long arg3,
178                       abi_long arg4, abi_long arg5, abi_long arg6);
179 void print_freebsd_syscall_ret(int num, abi_long ret);
180 void
181 print_netbsd_syscall(int num,
182                      abi_long arg1, abi_long arg2, abi_long arg3,
183                      abi_long arg4, abi_long arg5, abi_long arg6);
184 void print_netbsd_syscall_ret(int num, abi_long ret);
185 void
186 print_openbsd_syscall(int num,
187                       abi_long arg1, abi_long arg2, abi_long arg3,
188                       abi_long arg4, abi_long arg5, abi_long arg6);
189 void print_openbsd_syscall_ret(int num, abi_long ret);
190 extern int do_strace;
191 
192 /* signal.c */
193 void process_pending_signals(CPUArchState *cpu_env);
194 void signal_init(void);
195 //int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info);
196 //void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
197 //void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
198 long do_sigreturn(CPUArchState *env);
199 long do_rt_sigreturn(CPUArchState *env);
200 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp);
201 
202 /* mmap.c */
203 int target_mprotect(abi_ulong start, abi_ulong len, int prot);
204 abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
205                      int flags, int fd, abi_ulong offset);
206 int target_munmap(abi_ulong start, abi_ulong len);
207 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
208                        abi_ulong new_size, unsigned long flags,
209                        abi_ulong new_addr);
210 int target_msync(abi_ulong start, abi_ulong len, int flags);
211 extern unsigned long last_brk;
212 #if defined(CONFIG_USE_NPTL)
213 void mmap_fork_start(void);
214 void mmap_fork_end(int child);
215 #endif
216 
217 /* main.c */
218 extern unsigned long x86_stack_size;
219 
220 /* user access */
221 
222 #define VERIFY_READ 0
223 #define VERIFY_WRITE 1 /* implies read access */
224 
225 static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
226 {
227     return page_check_range((target_ulong)addr, size,
228                             (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0;
229 }
230 
231 /* NOTE __get_user and __put_user use host pointers and don't check access. */
232 /* These are usually used to access struct data members once the
233  * struct has been locked - usually with lock_user_struct().
234  */
235 #define __put_user(x, hptr)\
236 ({\
237     int size = sizeof(*hptr);\
238     switch(size) {\
239     case 1:\
240         *(uint8_t *)(hptr) = (uint8_t)(typeof(*hptr))(x);\
241         break;\
242     case 2:\
243         *(uint16_t *)(hptr) = tswap16((typeof(*hptr))(x));\
244         break;\
245     case 4:\
246         *(uint32_t *)(hptr) = tswap32((typeof(*hptr))(x));\
247         break;\
248     case 8:\
249         *(uint64_t *)(hptr) = tswap64((typeof(*hptr))(x));\
250         break;\
251     default:\
252         abort();\
253     }\
254     0;\
255 })
256 
257 #define __get_user(x, hptr) \
258 ({\
259     int size = sizeof(*hptr);\
260     switch(size) {\
261     case 1:\
262         x = (typeof(*hptr))*(uint8_t *)(hptr);\
263         break;\
264     case 2:\
265         x = (typeof(*hptr))tswap16(*(uint16_t *)(hptr));\
266         break;\
267     case 4:\
268         x = (typeof(*hptr))tswap32(*(uint32_t *)(hptr));\
269         break;\
270     case 8:\
271         x = (typeof(*hptr))tswap64(*(uint64_t *)(hptr));\
272         break;\
273     default:\
274         /* avoid warning */\
275         x = 0;\
276         abort();\
277     }\
278     0;\
279 })
280 
281 /* put_user()/get_user() take a guest address and check access */
282 /* These are usually used to access an atomic data type, such as an int,
283  * that has been passed by address.  These internally perform locking
284  * and unlocking on the data type.
285  */
286 #define put_user(x, gaddr, target_type)                                 \
287 ({                                                                      \
288     abi_ulong __gaddr = (gaddr);                                        \
289     target_type *__hptr;                                                \
290     abi_long __ret;                                                     \
291     if ((__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0))) { \
292         __ret = __put_user((x), __hptr);                                \
293         unlock_user(__hptr, __gaddr, sizeof(target_type));              \
294     } else                                                              \
295         __ret = -TARGET_EFAULT;                                         \
296     __ret;                                                              \
297 })
298 
299 #define get_user(x, gaddr, target_type)                                 \
300 ({                                                                      \
301     abi_ulong __gaddr = (gaddr);                                        \
302     target_type *__hptr;                                                \
303     abi_long __ret;                                                     \
304     if ((__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1))) { \
305         __ret = __get_user((x), __hptr);                                \
306         unlock_user(__hptr, __gaddr, 0);                                \
307     } else {                                                            \
308         /* avoid warning */                                             \
309         (x) = 0;                                                        \
310         __ret = -TARGET_EFAULT;                                         \
311     }                                                                   \
312     __ret;                                                              \
313 })
314 
315 #define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
316 #define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
317 #define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
318 #define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
319 #define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
320 #define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
321 #define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
322 #define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
323 #define put_user_u8(x, gaddr)  put_user((x), (gaddr), uint8_t)
324 #define put_user_s8(x, gaddr)  put_user((x), (gaddr), int8_t)
325 
326 #define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
327 #define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
328 #define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
329 #define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
330 #define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
331 #define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
332 #define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
333 #define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
334 #define get_user_u8(x, gaddr)  get_user((x), (gaddr), uint8_t)
335 #define get_user_s8(x, gaddr)  get_user((x), (gaddr), int8_t)
336 
337 /* copy_from_user() and copy_to_user() are usually used to copy data
338  * buffers between the target and host.  These internally perform
339  * locking/unlocking of the memory.
340  */
341 abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
342 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
343 
344 /* Functions for accessing guest memory.  The tget and tput functions
345    read/write single values, byteswapping as necessary.  The lock_user function
346    gets a pointer to a contiguous area of guest memory, but does not perform
347    any byteswapping.  lock_user may return either a pointer to the guest
348    memory, or a temporary buffer.  */
349 
350 /* Lock an area of guest memory into the host.  If copy is true then the
351    host area will have the same contents as the guest.  */
352 static inline void *lock_user(int type, abi_ulong guest_addr, long len, int copy)
353 {
354     if (!access_ok(type, guest_addr, len))
355         return NULL;
356 #ifdef DEBUG_REMAP
357     {
358         void *addr;
359         addr = g_malloc(len);
360         if (copy)
361             memcpy(addr, g2h(guest_addr), len);
362         else
363             memset(addr, 0, len);
364         return addr;
365     }
366 #else
367     return g2h(guest_addr);
368 #endif
369 }
370 
371 /* Unlock an area of guest memory.  The first LEN bytes must be
372    flushed back to guest memory. host_ptr = NULL is explicitly
373    allowed and does nothing. */
374 static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
375                                long len)
376 {
377 
378 #ifdef DEBUG_REMAP
379     if (!host_ptr)
380         return;
381     if (host_ptr == g2h(guest_addr))
382         return;
383     if (len > 0)
384         memcpy(g2h(guest_addr), host_ptr, len);
385     g_free(host_ptr);
386 #endif
387 }
388 
389 /* Return the length of a string in target memory or -TARGET_EFAULT if
390    access error. */
391 abi_long target_strlen(abi_ulong gaddr);
392 
393 /* Like lock_user but for null terminated strings.  */
394 static inline void *lock_user_string(abi_ulong guest_addr)
395 {
396     abi_long len;
397     len = target_strlen(guest_addr);
398     if (len < 0)
399         return NULL;
400     return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
401 }
402 
403 /* Helper macros for locking/unlocking a target struct.  */
404 #define lock_user_struct(type, host_ptr, guest_addr, copy)      \
405     (host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
406 #define unlock_user_struct(host_ptr, guest_addr, copy)          \
407     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
408 
409 #if defined(CONFIG_USE_NPTL)
410 #include <pthread.h>
411 #endif
412 
413 #endif /* QEMU_H */
414