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20#include "qemu/osdep.h"
21
22#include "cpu.h"
23#if defined(CONFIG_USER_ONLY)
24#include "qemu.h"
25#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
26#else
27#include "qemu-common.h"
28#include "exec/gdbstub.h"
29#include "exec/softmmu-semi.h"
30#endif
31#include "sysemu/sysemu.h"
32
33#define HOSTED_EXIT 0
34#define HOSTED_INIT_SIM 1
35#define HOSTED_OPEN 2
36#define HOSTED_CLOSE 3
37#define HOSTED_READ 4
38#define HOSTED_WRITE 5
39#define HOSTED_LSEEK 6
40#define HOSTED_RENAME 7
41#define HOSTED_UNLINK 8
42#define HOSTED_STAT 9
43#define HOSTED_FSTAT 10
44#define HOSTED_GETTIMEOFDAY 11
45#define HOSTED_ISATTY 12
46#define HOSTED_SYSTEM 13
47
48typedef uint32_t gdb_mode_t;
49typedef uint32_t gdb_time_t;
50
51struct m68k_gdb_stat {
52 uint32_t gdb_st_dev;
53 uint32_t gdb_st_ino;
54 gdb_mode_t gdb_st_mode;
55 uint32_t gdb_st_nlink;
56 uint32_t gdb_st_uid;
57 uint32_t gdb_st_gid;
58 uint32_t gdb_st_rdev;
59 uint64_t gdb_st_size;
60 uint64_t gdb_st_blksize;
61 uint64_t gdb_st_blocks;
62 gdb_time_t gdb_st_atime;
63 gdb_time_t gdb_st_mtime;
64 gdb_time_t gdb_st_ctime;
65} QEMU_PACKED;
66
67struct gdb_timeval {
68 gdb_time_t tv_sec;
69 uint64_t tv_usec;
70} QEMU_PACKED;
71
72#define GDB_O_RDONLY 0x0
73#define GDB_O_WRONLY 0x1
74#define GDB_O_RDWR 0x2
75#define GDB_O_APPEND 0x8
76#define GDB_O_CREAT 0x200
77#define GDB_O_TRUNC 0x400
78#define GDB_O_EXCL 0x800
79
80static int translate_openflags(int flags)
81{
82 int hf;
83
84 if (flags & GDB_O_WRONLY)
85 hf = O_WRONLY;
86 else if (flags & GDB_O_RDWR)
87 hf = O_RDWR;
88 else
89 hf = O_RDONLY;
90
91 if (flags & GDB_O_APPEND) hf |= O_APPEND;
92 if (flags & GDB_O_CREAT) hf |= O_CREAT;
93 if (flags & GDB_O_TRUNC) hf |= O_TRUNC;
94 if (flags & GDB_O_EXCL) hf |= O_EXCL;
95
96 return hf;
97}
98
99static void translate_stat(CPUM68KState *env, target_ulong addr, struct stat *s)
100{
101 struct m68k_gdb_stat *p;
102
103 if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
104
105 return;
106 p->gdb_st_dev = cpu_to_be32(s->st_dev);
107 p->gdb_st_ino = cpu_to_be32(s->st_ino);
108 p->gdb_st_mode = cpu_to_be32(s->st_mode);
109 p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
110 p->gdb_st_uid = cpu_to_be32(s->st_uid);
111 p->gdb_st_gid = cpu_to_be32(s->st_gid);
112 p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
113 p->gdb_st_size = cpu_to_be64(s->st_size);
114#ifdef _WIN32
115
116 p->gdb_st_blksize = 0;
117 p->gdb_st_blocks = 0;
118#else
119 p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
120 p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
121#endif
122 p->gdb_st_atime = cpu_to_be32(s->st_atime);
123 p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
124 p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
125 unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
126}
127
128static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
129{
130 target_ulong args = env->dregs[1];
131 if (put_user_u32(ret, args) ||
132 put_user_u32(err, args + 4)) {
133
134
135
136
137 qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
138 "discarded because argument block not writable\n");
139 }
140}
141
142static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err)
143{
144 target_ulong args = env->dregs[1];
145 if (put_user_u32(ret >> 32, args) ||
146 put_user_u32(ret, args + 4) ||
147 put_user_u32(err, args + 8)) {
148
149 qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
150 "discarded because argument block not writable\n");
151 }
152}
153
154static int m68k_semi_is_fseek;
155
156static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
157{
158 M68kCPU *cpu = M68K_CPU(cs);
159 CPUM68KState *env = &cpu->env;
160
161 if (m68k_semi_is_fseek) {
162
163
164 m68k_semi_return_u64(env, ret, err);
165 m68k_semi_is_fseek = 0;
166 } else {
167 m68k_semi_return_u32(env, ret, err);
168 }
169}
170
171
172
173
174#define GET_ARG(n) do { \
175 if (get_user_ual(arg ## n, args + (n) * 4)) { \
176 result = -1; \
177 errno = EFAULT; \
178 goto failed; \
179 } \
180} while (0)
181
182void do_m68k_semihosting(CPUM68KState *env, int nr)
183{
184 uint32_t args;
185 target_ulong arg0, arg1, arg2, arg3;
186 void *p;
187 void *q;
188 uint32_t len;
189 uint32_t result;
190
191 args = env->dregs[1];
192 switch (nr) {
193 case HOSTED_EXIT:
194 gdb_exit(env, env->dregs[0]);
195 exit(env->dregs[0]);
196 case HOSTED_OPEN:
197 GET_ARG(0);
198 GET_ARG(1);
199 GET_ARG(2);
200 GET_ARG(3);
201 if (use_gdb_syscalls()) {
202 gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
203 arg2, arg3);
204 return;
205 } else {
206 p = lock_user_string(arg0);
207 if (!p) {
208
209 result = -1;
210 } else {
211 result = open(p, translate_openflags(arg2), arg3);
212 unlock_user(p, arg0, 0);
213 }
214 }
215 break;
216 case HOSTED_CLOSE:
217 {
218
219 GET_ARG(0);
220 int fd = arg0;
221 if (fd > 2) {
222 if (use_gdb_syscalls()) {
223 gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
224 return;
225 } else {
226 result = close(fd);
227 }
228 } else {
229 result = 0;
230 }
231 break;
232 }
233 case HOSTED_READ:
234 GET_ARG(0);
235 GET_ARG(1);
236 GET_ARG(2);
237 len = arg2;
238 if (use_gdb_syscalls()) {
239 gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
240 arg0, arg1, len);
241 return;
242 } else {
243 p = lock_user(VERIFY_WRITE, arg1, len, 0);
244 if (!p) {
245
246 result = -1;
247 } else {
248 result = read(arg0, p, len);
249 unlock_user(p, arg1, len);
250 }
251 }
252 break;
253 case HOSTED_WRITE:
254 GET_ARG(0);
255 GET_ARG(1);
256 GET_ARG(2);
257 len = arg2;
258 if (use_gdb_syscalls()) {
259 gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
260 arg0, arg1, len);
261 return;
262 } else {
263 p = lock_user(VERIFY_READ, arg1, len, 1);
264 if (!p) {
265
266 result = -1;
267 } else {
268 result = write(arg0, p, len);
269 unlock_user(p, arg0, 0);
270 }
271 }
272 break;
273 case HOSTED_LSEEK:
274 {
275 uint64_t off;
276 GET_ARG(0);
277 GET_ARG(1);
278 GET_ARG(2);
279 GET_ARG(3);
280 off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
281 if (use_gdb_syscalls()) {
282 m68k_semi_is_fseek = 1;
283 gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
284 arg0, off, arg3);
285 } else {
286 off = lseek(arg0, off, arg3);
287 m68k_semi_return_u64(env, off, errno);
288 }
289 return;
290 }
291 case HOSTED_RENAME:
292 GET_ARG(0);
293 GET_ARG(1);
294 GET_ARG(2);
295 GET_ARG(3);
296 if (use_gdb_syscalls()) {
297 gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
298 arg0, (int)arg1, arg2, (int)arg3);
299 return;
300 } else {
301 p = lock_user_string(arg0);
302 q = lock_user_string(arg2);
303 if (!p || !q) {
304
305 result = -1;
306 } else {
307 result = rename(p, q);
308 }
309 unlock_user(p, arg0, 0);
310 unlock_user(q, arg2, 0);
311 }
312 break;
313 case HOSTED_UNLINK:
314 GET_ARG(0);
315 GET_ARG(1);
316 if (use_gdb_syscalls()) {
317 gdb_do_syscall(m68k_semi_cb, "unlink,%s",
318 arg0, (int)arg1);
319 return;
320 } else {
321 p = lock_user_string(arg0);
322 if (!p) {
323
324 result = -1;
325 } else {
326 result = unlink(p);
327 unlock_user(p, arg0, 0);
328 }
329 }
330 break;
331 case HOSTED_STAT:
332 GET_ARG(0);
333 GET_ARG(1);
334 GET_ARG(2);
335 if (use_gdb_syscalls()) {
336 gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
337 arg0, (int)arg1, arg2);
338 return;
339 } else {
340 struct stat s;
341 p = lock_user_string(arg0);
342 if (!p) {
343
344 result = -1;
345 } else {
346 result = stat(p, &s);
347 unlock_user(p, arg0, 0);
348 }
349 if (result == 0) {
350 translate_stat(env, arg2, &s);
351 }
352 }
353 break;
354 case HOSTED_FSTAT:
355 GET_ARG(0);
356 GET_ARG(1);
357 if (use_gdb_syscalls()) {
358 gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
359 arg0, arg1);
360 return;
361 } else {
362 struct stat s;
363 result = fstat(arg0, &s);
364 if (result == 0) {
365 translate_stat(env, arg1, &s);
366 }
367 }
368 break;
369 case HOSTED_GETTIMEOFDAY:
370 GET_ARG(0);
371 GET_ARG(1);
372 if (use_gdb_syscalls()) {
373 gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
374 arg0, arg1);
375 return;
376 } else {
377 qemu_timeval tv;
378 struct gdb_timeval *p;
379 result = qemu_gettimeofday(&tv);
380 if (result != 0) {
381 if (!(p = lock_user(VERIFY_WRITE,
382 arg0, sizeof(struct gdb_timeval), 0))) {
383
384 result = -1;
385 } else {
386 p->tv_sec = cpu_to_be32(tv.tv_sec);
387 p->tv_usec = cpu_to_be64(tv.tv_usec);
388 unlock_user(p, arg0, sizeof(struct gdb_timeval));
389 }
390 }
391 }
392 break;
393 case HOSTED_ISATTY:
394 GET_ARG(0);
395 if (use_gdb_syscalls()) {
396 gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
397 return;
398 } else {
399 result = isatty(arg0);
400 }
401 break;
402 case HOSTED_SYSTEM:
403 GET_ARG(0);
404 GET_ARG(1);
405 if (use_gdb_syscalls()) {
406 gdb_do_syscall(m68k_semi_cb, "system,%s",
407 arg0, (int)arg1);
408 return;
409 } else {
410 p = lock_user_string(arg0);
411 if (!p) {
412
413 result = -1;
414 } else {
415 result = system(p);
416 unlock_user(p, arg0, 0);
417 }
418 }
419 break;
420 case HOSTED_INIT_SIM:
421#if defined(CONFIG_USER_ONLY)
422 {
423 CPUState *cs = CPU(m68k_env_get_cpu(env));
424 TaskState *ts = cs->opaque;
425
426 if (!ts->heap_limit) {
427 abi_ulong ret;
428 uint32_t size;
429 uint32_t base;
430
431 base = do_brk(0);
432 size = SEMIHOSTING_HEAP_SIZE;
433
434 for (;;) {
435 ret = do_brk(base + size);
436 if (ret >= (base + size)) {
437 break;
438 }
439 size >>= 1;
440 }
441 ts->heap_limit = base + size;
442 }
443
444
445 env->dregs[1] = ts->heap_limit;
446 env->aregs[7] = ts->stack_base;
447 }
448#else
449
450
451 env->dregs[1] = ram_size;
452 env->aregs[7] = ram_size;
453#endif
454 return;
455 default:
456 cpu_abort(CPU(m68k_env_get_cpu(env)), "Unsupported semihosting syscall %d\n", nr);
457 result = 0;
458 }
459failed:
460 m68k_semi_return_u32(env, result, errno);
461}
462
