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a4f81979 FB |
1 | /* |
2 | * Arm "Angel" semihosting syscalls | |
3 | * | |
8e71621f PB |
4 | * Copyright (c) 2005, 2007 CodeSourcery. |
5 | * Written by Paul Brook. | |
a4f81979 FB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
21 | ||
22 | #include <sys/types.h> | |
23 | #include <sys/stat.h> | |
24 | #include <fcntl.h> | |
25 | #include <unistd.h> | |
26 | #include <stdlib.h> | |
27 | #include <stdio.h> | |
28 | #include <time.h> | |
29 | ||
8e71621f PB |
30 | #include "cpu.h" |
31 | #ifdef CONFIG_USER_ONLY | |
a4f81979 FB |
32 | #include "qemu.h" |
33 | ||
34 | #define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024) | |
8e71621f PB |
35 | #else |
36 | #include "vl.h" | |
37 | #endif | |
a4f81979 FB |
38 | |
39 | #define SYS_OPEN 0x01 | |
40 | #define SYS_CLOSE 0x02 | |
41 | #define SYS_WRITEC 0x03 | |
42 | #define SYS_WRITE0 0x04 | |
43 | #define SYS_WRITE 0x05 | |
44 | #define SYS_READ 0x06 | |
45 | #define SYS_READC 0x07 | |
46 | #define SYS_ISTTY 0x09 | |
47 | #define SYS_SEEK 0x0a | |
48 | #define SYS_FLEN 0x0c | |
49 | #define SYS_TMPNAM 0x0d | |
50 | #define SYS_REMOVE 0x0e | |
51 | #define SYS_RENAME 0x0f | |
52 | #define SYS_CLOCK 0x10 | |
53 | #define SYS_TIME 0x11 | |
54 | #define SYS_SYSTEM 0x12 | |
55 | #define SYS_ERRNO 0x13 | |
56 | #define SYS_GET_CMDLINE 0x15 | |
57 | #define SYS_HEAPINFO 0x16 | |
58 | #define SYS_EXIT 0x18 | |
59 | ||
60 | #ifndef O_BINARY | |
61 | #define O_BINARY 0 | |
62 | #endif | |
63 | ||
64 | int open_modeflags[12] = { | |
65 | O_RDONLY, | |
66 | O_RDONLY | O_BINARY, | |
67 | O_RDWR, | |
68 | O_RDWR | O_BINARY, | |
69 | O_WRONLY | O_CREAT | O_TRUNC, | |
70 | O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, | |
71 | O_RDWR | O_CREAT | O_TRUNC, | |
72 | O_RDWR | O_CREAT | O_TRUNC | O_BINARY, | |
73 | O_WRONLY | O_CREAT | O_APPEND, | |
74 | O_WRONLY | O_CREAT | O_APPEND | O_BINARY, | |
75 | O_RDWR | O_CREAT | O_APPEND, | |
76 | O_RDWR | O_CREAT | O_APPEND | O_BINARY | |
77 | }; | |
78 | ||
8e71621f | 79 | #ifdef CONFIG_USER_ONLY |
a4f81979 FB |
80 | static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code) |
81 | { | |
8e71621f PB |
82 | if (code == (uint32_t)-1) |
83 | ts->swi_errno = errno; | |
84 | return code; | |
85 | } | |
86 | #else | |
87 | static inline uint32_t set_swi_errno(CPUState *env, uint32_t code) | |
88 | { | |
89 | return code; | |
90 | } | |
91 | ||
92 | static uint32_t softmmu_tget32(CPUState *env, uint32_t addr) | |
93 | { | |
94 | uint32_t val; | |
95 | ||
96 | cpu_memory_rw_debug(env, addr, (uint8_t *)&val, 4, 0); | |
97 | return tswap32(val); | |
a4f81979 | 98 | } |
8e71621f PB |
99 | static uint32_t softmmu_tget8(CPUState *env, uint32_t addr) |
100 | { | |
101 | uint8_t val; | |
102 | ||
103 | cpu_memory_rw_debug(env, addr, &val, 1, 0); | |
104 | return val; | |
105 | } | |
106 | #define tget32(p) softmmu_tget32(env, p) | |
107 | #define tget8(p) softmmu_tget8(env, p) | |
108 | ||
109 | static void *softmmu_lock_user(CPUState *env, uint32_t addr, uint32_t len, | |
110 | int copy) | |
111 | { | |
112 | char *p; | |
113 | /* TODO: Make this something that isn't fixed size. */ | |
114 | p = malloc(len); | |
115 | if (copy) | |
116 | cpu_memory_rw_debug(env, addr, p, len, 0); | |
117 | return p; | |
118 | } | |
119 | #define lock_user(p, len, copy) softmmu_lock_user(env, p, len, copy) | |
120 | static char *softmmu_lock_user_string(CPUState *env, uint32_t addr) | |
121 | { | |
122 | char *p; | |
123 | char *s; | |
124 | uint8_t c; | |
125 | /* TODO: Make this something that isn't fixed size. */ | |
126 | s = p = malloc(1024); | |
127 | do { | |
128 | cpu_memory_rw_debug(env, addr, &c, 1, 0); | |
129 | addr++; | |
130 | *(p++) = c; | |
131 | } while (c); | |
132 | return s; | |
133 | } | |
134 | #define lock_user_string(p) softmmu_lock_user_string(env, p) | |
135 | static void softmmu_unlock_user(CPUState *env, void *p, target_ulong addr, | |
136 | target_ulong len) | |
137 | { | |
138 | if (len) | |
139 | cpu_memory_rw_debug(env, addr, p, len, 1); | |
140 | free(p); | |
141 | } | |
142 | #define unlock_user(s, args, len) softmmu_unlock_user(env, s, args, len) | |
143 | #endif | |
a4f81979 | 144 | |
38d0662a PB |
145 | #define ARG(n) tget32(args + (n) * 4) |
146 | #define SET_ARG(n, val) tput32(args + (n) * 4,val) | |
a4f81979 FB |
147 | uint32_t do_arm_semihosting(CPUState *env) |
148 | { | |
53a5960a | 149 | target_ulong args; |
a4f81979 FB |
150 | char * s; |
151 | int nr; | |
152 | uint32_t ret; | |
8e71621f PB |
153 | uint32_t len; |
154 | #ifdef CONFIG_USER_ONLY | |
a4f81979 | 155 | TaskState *ts = env->opaque; |
8e71621f PB |
156 | #else |
157 | CPUState *ts = env; | |
158 | #endif | |
a4f81979 FB |
159 | |
160 | nr = env->regs[0]; | |
53a5960a | 161 | args = env->regs[1]; |
a4f81979 FB |
162 | switch (nr) { |
163 | case SYS_OPEN: | |
8e71621f | 164 | s = lock_user_string(ARG(0)); |
a4f81979 FB |
165 | if (ARG(1) >= 12) |
166 | return (uint32_t)-1; | |
167 | if (strcmp(s, ":tt") == 0) { | |
168 | if (ARG(1) < 4) | |
169 | return STDIN_FILENO; | |
170 | else | |
171 | return STDOUT_FILENO; | |
172 | } | |
8e71621f PB |
173 | ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644)); |
174 | unlock_user(s, ARG(0), 0); | |
175 | return ret; | |
a4f81979 FB |
176 | case SYS_CLOSE: |
177 | return set_swi_errno(ts, close(ARG(0))); | |
178 | case SYS_WRITEC: | |
53a5960a PB |
179 | { |
180 | char c = tget8(args); | |
181 | /* Write to debug console. stderr is near enough. */ | |
182 | return write(STDERR_FILENO, &c, 1); | |
183 | } | |
a4f81979 | 184 | case SYS_WRITE0: |
53a5960a PB |
185 | s = lock_user_string(args); |
186 | ret = write(STDERR_FILENO, s, strlen(s)); | |
187 | unlock_user(s, args, 0); | |
188 | return ret; | |
a4f81979 | 189 | case SYS_WRITE: |
8e71621f PB |
190 | len = ARG(2); |
191 | s = lock_user(ARG(1), len, 1); | |
192 | ret = set_swi_errno(ts, write(ARG(0), s, len)); | |
193 | unlock_user(s, ARG(1), 0); | |
a4f81979 FB |
194 | if (ret == (uint32_t)-1) |
195 | return -1; | |
196 | return ARG(2) - ret; | |
197 | case SYS_READ: | |
8e71621f PB |
198 | len = ARG(2); |
199 | s = lock_user(ARG(1), len, 0); | |
200 | do | |
201 | ret = set_swi_errno(ts, read(ARG(0), s, len)); | |
202 | while (ret == -1 && errno == EINTR); | |
203 | unlock_user(s, ARG(1), len); | |
a4f81979 FB |
204 | if (ret == (uint32_t)-1) |
205 | return -1; | |
206 | return ARG(2) - ret; | |
207 | case SYS_READC: | |
208 | /* XXX: Read from debug cosole. Not implemented. */ | |
209 | return 0; | |
210 | case SYS_ISTTY: | |
211 | return isatty(ARG(0)); | |
212 | case SYS_SEEK: | |
d0b3e735 FB |
213 | ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET)); |
214 | if (ret == (uint32_t)-1) | |
215 | return -1; | |
216 | return 0; | |
a4f81979 FB |
217 | case SYS_FLEN: |
218 | { | |
219 | struct stat buf; | |
220 | ret = set_swi_errno(ts, fstat(ARG(0), &buf)); | |
221 | if (ret == (uint32_t)-1) | |
222 | return -1; | |
223 | return buf.st_size; | |
224 | } | |
225 | case SYS_TMPNAM: | |
226 | /* XXX: Not implemented. */ | |
227 | return -1; | |
228 | case SYS_REMOVE: | |
8e71621f PB |
229 | s = lock_user_string(ARG(0)); |
230 | ret = set_swi_errno(ts, remove(s)); | |
231 | unlock_user(s, ARG(0), 0); | |
232 | return ret; | |
a4f81979 | 233 | case SYS_RENAME: |
8e71621f PB |
234 | { |
235 | char *s2; | |
236 | s = lock_user_string(ARG(0)); | |
237 | s2 = lock_user_string(ARG(2)); | |
238 | ret = set_swi_errno(ts, rename(s, s2)); | |
239 | unlock_user(s2, ARG(2), 0); | |
240 | unlock_user(s, ARG(0), 0); | |
241 | return ret; | |
242 | } | |
a4f81979 FB |
243 | case SYS_CLOCK: |
244 | return clock() / (CLOCKS_PER_SEC / 100); | |
245 | case SYS_TIME: | |
246 | return set_swi_errno(ts, time(NULL)); | |
247 | case SYS_SYSTEM: | |
8e71621f PB |
248 | s = lock_user_string(ARG(0)); |
249 | ret = set_swi_errno(ts, system(s)); | |
250 | unlock_user(s, ARG(0), 0); | |
a4f81979 | 251 | case SYS_ERRNO: |
8e71621f | 252 | #ifdef CONFIG_USER_ONLY |
a4f81979 | 253 | return ts->swi_errno; |
8e71621f PB |
254 | #else |
255 | return 0; | |
256 | #endif | |
a4f81979 | 257 | case SYS_GET_CMDLINE: |
8e71621f | 258 | #ifdef CONFIG_USER_ONLY |
38d0662a PB |
259 | /* Build a commandline from the original argv. */ |
260 | { | |
261 | char **arg = ts->info->host_argv; | |
262 | int len = ARG(1); | |
263 | /* lock the buffer on the ARM side */ | |
264 | char *cmdline_buffer = (char*)lock_user(ARG(0), len, 0); | |
265 | ||
266 | s = cmdline_buffer; | |
267 | while (*arg && len > 2) { | |
268 | int n = strlen(*arg); | |
269 | ||
270 | if (s != cmdline_buffer) { | |
271 | *(s++) = ' '; | |
272 | len--; | |
273 | } | |
274 | if (n >= len) | |
275 | n = len - 1; | |
276 | memcpy(s, *arg, n); | |
277 | s += n; | |
278 | len -= n; | |
279 | arg++; | |
280 | } | |
281 | /* Null terminate the string. */ | |
282 | *s = 0; | |
283 | len = s - cmdline_buffer; | |
284 | ||
285 | /* Unlock the buffer on the ARM side. */ | |
286 | unlock_user(cmdline_buffer, ARG(0), len); | |
287 | ||
288 | /* Adjust the commandline length argument. */ | |
289 | SET_ARG(1, len); | |
290 | ||
291 | /* Return success if commandline fit into buffer. */ | |
292 | return *arg ? -1 : 0; | |
293 | } | |
8e71621f PB |
294 | #else |
295 | return -1; | |
296 | #endif | |
a4f81979 FB |
297 | case SYS_HEAPINFO: |
298 | { | |
299 | uint32_t *ptr; | |
300 | uint32_t limit; | |
301 | ||
8e71621f PB |
302 | #ifdef CONFIG_USER_ONLY |
303 | /* Some C libraries assume the heap immediately follows .bss, so | |
a4f81979 FB |
304 | allocate it using sbrk. */ |
305 | if (!ts->heap_limit) { | |
306 | long ret; | |
307 | ||
53a5960a | 308 | ts->heap_base = do_brk(0); |
a4f81979 FB |
309 | limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE; |
310 | /* Try a big heap, and reduce the size if that fails. */ | |
311 | for (;;) { | |
53a5960a | 312 | ret = do_brk(limit); |
a4f81979 FB |
313 | if (ret != -1) |
314 | break; | |
315 | limit = (ts->heap_base >> 1) + (limit >> 1); | |
316 | } | |
317 | ts->heap_limit = limit; | |
318 | } | |
319 | ||
8e71621f | 320 | ptr = lock_user(ARG(0), 16, 0); |
a4f81979 FB |
321 | ptr[0] = tswap32(ts->heap_base); |
322 | ptr[1] = tswap32(ts->heap_limit); | |
323 | ptr[2] = tswap32(ts->stack_base); | |
324 | ptr[3] = tswap32(0); /* Stack limit. */ | |
8e71621f PB |
325 | unlock_user(ptr, ARG(0), 16); |
326 | #else | |
327 | limit = ram_size; | |
328 | ptr = lock_user(ARG(0), 16, 0); | |
329 | /* TODO: Make this use the limit of the loaded application. */ | |
330 | ptr[0] = tswap32(limit / 2); | |
331 | ptr[1] = tswap32(limit); | |
332 | ptr[2] = tswap32(limit); /* Stack base */ | |
333 | ptr[3] = tswap32(0); /* Stack limit. */ | |
334 | unlock_user(ptr, ARG(0), 16); | |
335 | #endif | |
a4f81979 FB |
336 | return 0; |
337 | } | |
338 | case SYS_EXIT: | |
339 | exit(0); | |
340 | default: | |
341 | fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr); | |
342 | cpu_dump_state(env, stderr, fprintf, 0); | |
343 | abort(); | |
344 | } | |
345 | } |