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1 | /* syscalls.c --- implement system calls for the M32C simulator. |
2 | ||
8acc9f48 | 3 | Copyright (C) 2005-2013 Free Software Foundation, Inc. |
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4 | Contributed by Red Hat, Inc. |
5 | ||
6 | This file is part of the GNU simulators. | |
7 | ||
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8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
d45a4bef | 12 | |
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13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
d45a4bef JB |
17 | |
18 | You should have received a copy of the GNU General Public License | |
4744ac1b | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
d45a4bef | 20 | |
a6ff997c | 21 | #include "config.h" |
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22 | #include <stdio.h> |
23 | #include <stdlib.h> | |
24 | #include <fcntl.h> | |
25 | #include <unistd.h> | |
26 | #include <sys/time.h> | |
27 | ||
28 | #include "gdb/callback.h" | |
29 | ||
30 | #include "cpu.h" | |
31 | #include "mem.h" | |
32 | #include "syscalls.h" | |
33 | ||
727b6b4b | 34 | #include "syscall.h" |
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35 | |
36 | /* The current syscall callbacks we're using. */ | |
37 | static struct host_callback_struct *callbacks; | |
38 | ||
39 | void | |
40 | set_callbacks (struct host_callback_struct *cb) | |
41 | { | |
42 | callbacks = cb; | |
43 | } | |
44 | ||
45 | ||
46 | /* A16 ABI: arg1 in r1l (QI) or r1 (HI) or stack | |
47 | arg2 in r2 (HI) or stack | |
48 | arg3..N on stack | |
49 | padding: none | |
50 | ||
51 | A24 ABI: arg1 in r0l (QI) or r0 (HI) or stack | |
52 | arg2..N on stack | |
53 | padding: qi->hi | |
54 | ||
55 | return value in r0l (QI) r0 (HI) r2r0 (SI) | |
56 | structs: pointer pushed on stack last | |
57 | ||
58 | */ | |
59 | ||
60 | int argp, stackp; | |
61 | ||
62 | static int | |
63 | arg (int bytes) | |
64 | { | |
65 | int rv = 0; | |
66 | argp++; | |
67 | if (A16) | |
68 | { | |
69 | switch (argp) | |
70 | { | |
71 | case 1: | |
72 | if (bytes == 1) | |
73 | return get_reg (r1l); | |
74 | if (bytes == 2) | |
75 | return get_reg (r1); | |
76 | break; | |
77 | case 2: | |
78 | if (bytes == 2) | |
79 | return get_reg (r2); | |
80 | break; | |
81 | } | |
82 | } | |
83 | else | |
84 | { | |
85 | switch (argp) | |
86 | { | |
87 | case 1: | |
88 | if (bytes == 1) | |
89 | return get_reg (r0l); | |
90 | if (bytes == 2) | |
91 | return get_reg (r0); | |
92 | break; | |
93 | } | |
94 | } | |
95 | if (bytes == 0) | |
96 | bytes = 2; | |
97 | switch (bytes) | |
98 | { | |
99 | case 1: | |
100 | rv = mem_get_qi (get_reg (sp) + stackp); | |
101 | if (A24) | |
102 | stackp++; | |
103 | break; | |
104 | case 2: | |
105 | rv = mem_get_hi (get_reg (sp) + stackp); | |
106 | break; | |
107 | case 3: | |
108 | rv = mem_get_psi (get_reg (sp) + stackp); | |
109 | if (A24) | |
110 | stackp++; | |
111 | break; | |
112 | case 4: | |
113 | rv = mem_get_si (get_reg (sp) + stackp); | |
114 | break; | |
115 | } | |
116 | stackp += bytes; | |
117 | return rv; | |
118 | } | |
119 | ||
120 | static void | |
121 | read_target (char *buffer, int address, int count, int asciiz) | |
122 | { | |
123 | char byte; | |
124 | while (count > 0) | |
125 | { | |
126 | byte = mem_get_qi (address++); | |
127 | *buffer++ = byte; | |
128 | if (asciiz && (byte == 0)) | |
129 | return; | |
130 | count--; | |
131 | } | |
132 | } | |
133 | ||
134 | static void | |
135 | write_target (char *buffer, int address, int count, int asciiz) | |
136 | { | |
137 | char byte; | |
138 | while (count > 0) | |
139 | { | |
140 | byte = *buffer++; | |
141 | mem_put_qi (address++, byte); | |
142 | if (asciiz && (byte == 0)) | |
143 | return; | |
144 | count--; | |
145 | } | |
146 | } | |
147 | ||
148 | #define PTRSZ (A16 ? 2 : 3) | |
149 | ||
150 | static char *callnames[] = { | |
151 | "SYS_zero", | |
152 | "SYS_exit", | |
153 | "SYS_open", | |
154 | "SYS_close", | |
155 | "SYS_read", | |
156 | "SYS_write", | |
157 | "SYS_lseek", | |
158 | "SYS_unlink", | |
159 | "SYS_getpid", | |
160 | "SYS_kill", | |
161 | "SYS_fstat", | |
162 | "SYS_sbrk", | |
163 | "SYS_argvlen", | |
164 | "SYS_argv", | |
165 | "SYS_chdir", | |
166 | "SYS_stat", | |
167 | "SYS_chmod", | |
168 | "SYS_utime", | |
169 | "SYS_time", | |
170 | "SYS_gettimeofday", | |
171 | "SYS_times", | |
172 | "SYS_link" | |
173 | }; | |
174 | ||
175 | void | |
176 | m32c_syscall (int id) | |
177 | { | |
178 | static char buf[256]; | |
179 | int rv; | |
180 | ||
181 | argp = 0; | |
182 | stackp = A16 ? 3 : 4; | |
183 | if (trace) | |
184 | printf ("\033[31m/* SYSCALL(%d) = %s */\033[0m\n", id, callnames[id]); | |
185 | switch (id) | |
186 | { | |
187 | case SYS_exit: | |
188 | { | |
189 | int ec = arg (2); | |
190 | if (verbose) | |
191 | printf ("[exit %d]\n", ec); | |
192 | step_result = M32C_MAKE_EXITED (ec); | |
193 | } | |
194 | break; | |
195 | ||
196 | case SYS_open: | |
197 | { | |
198 | int path = arg (PTRSZ); | |
199 | int oflags = arg (2); | |
200 | int cflags = arg (2); | |
201 | ||
202 | read_target (buf, path, 256, 1); | |
203 | if (trace) | |
204 | printf ("open(\"%s\",0x%x,%#o) = ", buf, oflags, cflags); | |
205 | ||
206 | if (callbacks) | |
207 | /* The callback vector ignores CFLAGS. */ | |
208 | rv = callbacks->open (callbacks, buf, oflags); | |
209 | else | |
210 | { | |
211 | int h_oflags = 0; | |
212 | ||
213 | if (oflags & 0x0001) | |
214 | h_oflags |= O_WRONLY; | |
215 | if (oflags & 0x0002) | |
216 | h_oflags |= O_RDWR; | |
217 | if (oflags & 0x0200) | |
218 | h_oflags |= O_CREAT; | |
219 | if (oflags & 0x0008) | |
220 | h_oflags |= O_APPEND; | |
221 | if (oflags & 0x0400) | |
222 | h_oflags |= O_TRUNC; | |
223 | rv = open (buf, h_oflags, cflags); | |
224 | } | |
225 | if (trace) | |
226 | printf ("%d\n", rv); | |
227 | put_reg (r0, rv); | |
228 | } | |
229 | break; | |
230 | ||
231 | case SYS_close: | |
232 | { | |
233 | int fd = arg (2); | |
234 | ||
235 | if (callbacks) | |
236 | rv = callbacks->close (callbacks, fd); | |
237 | else if (fd > 2) | |
238 | rv = close (fd); | |
239 | else | |
240 | rv = 0; | |
241 | if (trace) | |
242 | printf ("close(%d) = %d\n", fd, rv); | |
243 | put_reg (r0, rv); | |
244 | } | |
245 | break; | |
246 | ||
247 | case SYS_read: | |
248 | { | |
249 | int fd = arg (2); | |
250 | int addr = arg (PTRSZ); | |
251 | int count = arg (2); | |
252 | ||
253 | if (count > sizeof (buf)) | |
254 | count = sizeof (buf); | |
255 | if (callbacks) | |
256 | rv = callbacks->read (callbacks, fd, buf, count); | |
257 | else | |
258 | rv = read (fd, buf, count); | |
259 | if (trace) | |
260 | printf ("read(%d,%d) = %d\n", fd, count, rv); | |
261 | if (rv > 0) | |
262 | write_target (buf, addr, rv, 0); | |
263 | put_reg (r0, rv); | |
264 | } | |
265 | break; | |
266 | ||
267 | case SYS_write: | |
268 | { | |
269 | int fd = arg (2); | |
270 | int addr = arg (PTRSZ); | |
271 | int count = arg (2); | |
272 | ||
273 | if (count > sizeof (buf)) | |
274 | count = sizeof (buf); | |
275 | if (trace) | |
276 | printf ("write(%d,0x%x,%d)\n", fd, addr, count); | |
277 | read_target (buf, addr, count, 0); | |
278 | if (trace) | |
279 | fflush (stdout); | |
280 | if (callbacks) | |
281 | rv = callbacks->write (callbacks, fd, buf, count); | |
282 | else | |
283 | rv = write (fd, buf, count); | |
284 | if (trace) | |
285 | printf ("write(%d,%d) = %d\n", fd, count, rv); | |
286 | put_reg (r0, rv); | |
287 | } | |
288 | break; | |
289 | ||
290 | case SYS_getpid: | |
291 | put_reg (r0, 42); | |
292 | break; | |
293 | ||
294 | case SYS_gettimeofday: | |
295 | { | |
296 | int tvaddr = arg (PTRSZ); | |
297 | struct timeval tv; | |
298 | ||
299 | rv = gettimeofday (&tv, 0); | |
300 | if (trace) | |
301 | printf ("gettimeofday: %ld sec %ld usec to 0x%x\n", tv.tv_sec, | |
302 | tv.tv_usec, tvaddr); | |
303 | mem_put_si (tvaddr, tv.tv_sec); | |
304 | mem_put_si (tvaddr + 4, tv.tv_usec); | |
305 | put_reg (r0, rv); | |
306 | } | |
307 | break; | |
308 | ||
309 | case SYS_kill: | |
310 | { | |
311 | int pid = arg (2); | |
312 | int sig = arg (2); | |
313 | if (pid == 42) | |
314 | { | |
315 | if (verbose) | |
316 | printf ("[signal %d]\n", sig); | |
317 | step_result = M32C_MAKE_STOPPED (sig); | |
318 | } | |
319 | } | |
320 | break; | |
321 | ||
322 | case 11: | |
323 | { | |
324 | int heaptop_arg = arg (PTRSZ); | |
325 | if (trace) | |
326 | printf ("sbrk: heap top set to %x\n", heaptop_arg); | |
327 | heaptop = heaptop_arg; | |
328 | if (heapbottom == 0) | |
329 | heapbottom = heaptop_arg; | |
330 | } | |
331 | break; | |
332 | ||
333 | } | |
334 | } |