1 /*
2 * Unified Hosting Interface syscalls.
3 *
4 * Copyright (c) 2015 Imagination Technologies
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 #include "qemu/osdep.h"
21 #include "cpu.h"
22 #include "qemu/log.h"
23 #include "gdbstub/syscalls.h"
24 #include "gdbstub/helpers.h"
25 #include "semihosting/uaccess.h"
26 #include "semihosting/semihost.h"
27 #include "semihosting/console.h"
28 #include "semihosting/syscalls.h"
29 #include "internal.h"
30
31 typedef enum UHIOp {
32 UHI_exit = 1,
33 UHI_open = 2,
34 UHI_close = 3,
35 UHI_read = 4,
36 UHI_write = 5,
37 UHI_lseek = 6,
38 UHI_unlink = 7,
39 UHI_fstat = 8,
40 UHI_argc = 9,
41 UHI_argnlen = 10,
42 UHI_argn = 11,
43 UHI_plog = 13,
44 UHI_assert = 14,
45 UHI_pread = 19,
46 UHI_pwrite = 20,
47 UHI_link = 22
48 } UHIOp;
49
50 typedef struct UHIStat {
51 int16_t uhi_st_dev;
52 uint16_t uhi_st_ino;
53 uint32_t uhi_st_mode;
54 uint16_t uhi_st_nlink;
55 uint16_t uhi_st_uid;
56 uint16_t uhi_st_gid;
57 int16_t uhi_st_rdev;
58 uint64_t uhi_st_size;
59 uint64_t uhi_st_atime;
60 uint64_t uhi_st_spare1;
61 uint64_t uhi_st_mtime;
62 uint64_t uhi_st_spare2;
63 uint64_t uhi_st_ctime;
64 uint64_t uhi_st_spare3;
65 uint64_t uhi_st_blksize;
66 uint64_t uhi_st_blocks;
67 uint64_t uhi_st_spare4[2];
68 } UHIStat;
69
70 enum UHIOpenFlags {
71 UHIOpen_RDONLY = 0x0,
72 UHIOpen_WRONLY = 0x1,
73 UHIOpen_RDWR = 0x2,
74 UHIOpen_APPEND = 0x8,
75 UHIOpen_CREAT = 0x200,
76 UHIOpen_TRUNC = 0x400,
77 UHIOpen_EXCL = 0x800
78 };
79
80 enum UHIErrno {
81 UHI_EACCESS = 13,
82 UHI_EAGAIN = 11,
83 UHI_EBADF = 9,
84 UHI_EBADMSG = 77,
85 UHI_EBUSY = 16,
86 UHI_ECONNRESET = 104,
87 UHI_EEXIST = 17,
88 UHI_EFBIG = 27,
89 UHI_EINTR = 4,
90 UHI_EINVAL = 22,
91 UHI_EIO = 5,
92 UHI_EISDIR = 21,
93 UHI_ELOOP = 92,
94 UHI_EMFILE = 24,
95 UHI_EMLINK = 31,
96 UHI_ENAMETOOLONG = 91,
97 UHI_ENETDOWN = 115,
98 UHI_ENETUNREACH = 114,
99 UHI_ENFILE = 23,
100 UHI_ENOBUFS = 105,
101 UHI_ENOENT = 2,
102 UHI_ENOMEM = 12,
103 UHI_ENOSPC = 28,
104 UHI_ENOSR = 63,
105 UHI_ENOTCONN = 128,
106 UHI_ENOTDIR = 20,
107 UHI_ENXIO = 6,
108 UHI_EOVERFLOW = 139,
109 UHI_EPERM = 1,
110 UHI_EPIPE = 32,
111 UHI_ERANGE = 34,
112 UHI_EROFS = 30,
113 UHI_ESPIPE = 29,
114 UHI_ETIMEDOUT = 116,
115 UHI_ETXTBSY = 26,
116 UHI_EWOULDBLOCK = 11,
117 UHI_EXDEV = 18,
118 };
119
report_fault(CPUMIPSState * env)120 static void report_fault(CPUMIPSState *env)
121 {
122 int op = env->active_tc.gpr[25];
123 error_report("Fault during UHI operation %d", op);
124 abort();
125 }
126
uhi_cb(CPUState * cs,uint64_t ret,int err)127 static void uhi_cb(CPUState *cs, uint64_t ret, int err)
128 {
129 CPUMIPSState *env = cpu_env(cs);
130
131 #define E(N) case E##N: err = UHI_E##N; break
132
133 switch (err) {
134 case 0:
135 break;
136 E(PERM);
137 E(NOENT);
138 E(INTR);
139 E(BADF);
140 E(BUSY);
141 E(EXIST);
142 E(NOTDIR);
143 E(ISDIR);
144 E(INVAL);
145 E(NFILE);
146 E(MFILE);
147 E(FBIG);
148 E(NOSPC);
149 E(SPIPE);
150 E(ROFS);
151 E(NAMETOOLONG);
152 default:
153 err = UHI_EINVAL;
154 break;
155 case EFAULT:
156 report_fault(env);
157 }
158
159 #undef E
160
161 env->active_tc.gpr[2] = ret;
162 env->active_tc.gpr[3] = err;
163 }
164
uhi_fstat_cb(CPUState * cs,uint64_t ret,int err)165 static void uhi_fstat_cb(CPUState *cs, uint64_t ret, int err)
166 {
167 QEMU_BUILD_BUG_ON(sizeof(UHIStat) < sizeof(struct gdb_stat));
168
169 if (!err) {
170 CPUMIPSState *env = cpu_env(cs);
171 target_ulong addr = env->active_tc.gpr[5];
172 UHIStat *dst = lock_user(VERIFY_WRITE, addr, sizeof(UHIStat), 1);
173 struct gdb_stat s;
174
175 if (!dst) {
176 report_fault(env);
177 }
178
179 memcpy(&s, dst, sizeof(struct gdb_stat));
180 memset(dst, 0, sizeof(UHIStat));
181
182 dst->uhi_st_dev = tswap16(be32_to_cpu(s.gdb_st_dev));
183 dst->uhi_st_ino = tswap16(be32_to_cpu(s.gdb_st_ino));
184 dst->uhi_st_mode = tswap32(be32_to_cpu(s.gdb_st_mode));
185 dst->uhi_st_nlink = tswap16(be32_to_cpu(s.gdb_st_nlink));
186 dst->uhi_st_uid = tswap16(be32_to_cpu(s.gdb_st_uid));
187 dst->uhi_st_gid = tswap16(be32_to_cpu(s.gdb_st_gid));
188 dst->uhi_st_rdev = tswap16(be32_to_cpu(s.gdb_st_rdev));
189 dst->uhi_st_size = tswap64(be64_to_cpu(s.gdb_st_size));
190 dst->uhi_st_atime = tswap64(be32_to_cpu(s.gdb_st_atime));
191 dst->uhi_st_mtime = tswap64(be32_to_cpu(s.gdb_st_mtime));
192 dst->uhi_st_ctime = tswap64(be32_to_cpu(s.gdb_st_ctime));
193 dst->uhi_st_blksize = tswap64(be64_to_cpu(s.gdb_st_blksize));
194 dst->uhi_st_blocks = tswap64(be64_to_cpu(s.gdb_st_blocks));
195
196 unlock_user(dst, addr, sizeof(UHIStat));
197 }
198
199 uhi_cb(cs, ret, err);
200 }
201
mips_semihosting(CPUMIPSState * env)202 void mips_semihosting(CPUMIPSState *env)
203 {
204 CPUState *cs = env_cpu(env);
205 target_ulong *gpr = env->active_tc.gpr;
206 const UHIOp op = gpr[25];
207 char *p;
208
209 switch (op) {
210 case UHI_exit:
211 gdb_exit(gpr[4]);
212 exit(gpr[4]);
213
214 case UHI_open:
215 {
216 target_ulong fname = gpr[4];
217 int ret = -1;
218
219 p = lock_user_string(fname);
220 if (!p) {
221 report_fault(env);
222 }
223 if (!strcmp("/dev/stdin", p)) {
224 ret = 0;
225 } else if (!strcmp("/dev/stdout", p)) {
226 ret = 1;
227 } else if (!strcmp("/dev/stderr", p)) {
228 ret = 2;
229 }
230 unlock_user(p, fname, 0);
231
232 /* FIXME: reusing a guest fd doesn't seem correct. */
233 if (ret >= 0) {
234 gpr[2] = ret;
235 break;
236 }
237
238 semihost_sys_open(cs, uhi_cb, fname, 0, gpr[5], gpr[6]);
239 }
240 break;
241
242 case UHI_close:
243 semihost_sys_close(cs, uhi_cb, gpr[4]);
244 break;
245 case UHI_read:
246 semihost_sys_read(cs, uhi_cb, gpr[4], gpr[5], gpr[6]);
247 break;
248 case UHI_write:
249 semihost_sys_write(cs, uhi_cb, gpr[4], gpr[5], gpr[6]);
250 break;
251 case UHI_lseek:
252 semihost_sys_lseek(cs, uhi_cb, gpr[4], gpr[5], gpr[6]);
253 break;
254 case UHI_unlink:
255 semihost_sys_remove(cs, uhi_cb, gpr[4], 0);
256 break;
257 case UHI_fstat:
258 semihost_sys_fstat(cs, uhi_fstat_cb, gpr[4], gpr[5]);
259 break;
260
261 case UHI_argc:
262 gpr[2] = semihosting_get_argc();
263 break;
264 case UHI_argnlen:
265 {
266 const char *s = semihosting_get_arg(gpr[4]);
267 gpr[2] = s ? strlen(s) : -1;
268 }
269 break;
270 case UHI_argn:
271 {
272 const char *s = semihosting_get_arg(gpr[4]);
273 target_ulong addr;
274 size_t len;
275
276 if (!s) {
277 gpr[2] = -1;
278 break;
279 }
280 len = strlen(s) + 1;
281 addr = gpr[5];
282 p = lock_user(VERIFY_WRITE, addr, len, 0);
283 if (!p) {
284 report_fault(env);
285 }
286 memcpy(p, s, len);
287 unlock_user(p, addr, len);
288 gpr[2] = 0;
289 }
290 break;
291
292 case UHI_plog:
293 {
294 target_ulong addr = gpr[4];
295 ssize_t len = target_strlen(addr);
296 GString *str;
297 char *pct_d;
298
299 if (len < 0) {
300 report_fault(env);
301 }
302 p = lock_user(VERIFY_READ, addr, len, 1);
303 if (!p) {
304 report_fault(env);
305 }
306
307 pct_d = strstr(p, "%d");
308 if (!pct_d) {
309 unlock_user(p, addr, 0);
310 semihost_sys_write(cs, uhi_cb, 2, addr, len);
311 break;
312 }
313
314 str = g_string_new_len(p, pct_d - p);
315 g_string_append_printf(str, "%d%s", (int)gpr[5], pct_d + 2);
316 unlock_user(p, addr, 0);
317
318 /*
319 * When we're using gdb, we need a guest address, so
320 * drop the string onto the stack below the stack pointer.
321 */
322 if (use_gdb_syscalls()) {
323 addr = gpr[29] - str->len;
324 p = lock_user(VERIFY_WRITE, addr, str->len, 0);
325 if (!p) {
326 report_fault(env);
327 }
328 memcpy(p, str->str, str->len);
329 unlock_user(p, addr, str->len);
330 semihost_sys_write(cs, uhi_cb, 2, addr, str->len);
331 } else {
332 gpr[2] = qemu_semihosting_console_write(str->str, str->len);
333 }
334 g_string_free(str, true);
335 }
336 break;
337
338 case UHI_assert:
339 {
340 const char *msg, *file;
341
342 msg = lock_user_string(gpr[4]);
343 if (!msg) {
344 msg = "<EFAULT>";
345 }
346 file = lock_user_string(gpr[5]);
347 if (!file) {
348 file = "<EFAULT>";
349 }
350
351 error_report("UHI assertion \"%s\": file \"%s\", line %d",
352 msg, file, (int)gpr[6]);
353 abort();
354 }
355
356 default:
357 error_report("Unknown UHI operation %d", op);
358 abort();
359 }
360 return;
361 }
362