aboutsummaryrefslogtreecommitdiff
path: root/sim/m32c/syscalls.c
blob: daebd1cc83e1f7e75c4f914fad6c654661c399ee (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
/* syscalls.c --- implement system calls for the M32C simulator.

Copyright (C) 2005-2015 Free Software Foundation, Inc.
Contributed by Red Hat, Inc.

This file is part of the GNU simulators.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/time.h>

#include "gdb/callback.h"

#include "cpu.h"
#include "mem.h"
#include "syscalls.h"

#include "syscall.h"

/* The current syscall callbacks we're using.  */
static struct host_callback_struct *callbacks;

void
set_callbacks (struct host_callback_struct *cb)
{
  callbacks = cb;
}


/* A16 ABI: arg1 in r1l (QI) or r1 (HI) or stack
            arg2 in r2 (HI) or stack
	    arg3..N on stack
	    padding: none

   A24 ABI: arg1 in r0l (QI) or r0 (HI) or stack
	    arg2..N on stack
	    padding: qi->hi

   return value in r0l (QI) r0 (HI) r2r0 (SI)
     structs: pointer pushed on stack last

*/

int argp, stackp;

static int
arg (int bytes)
{
  int rv = 0;
  argp++;
  if (A16)
    {
      switch (argp)
	{
	case 1:
	  if (bytes == 1)
	    return get_reg (r1l);
	  if (bytes == 2)
	    return get_reg (r1);
	  break;
	case 2:
	  if (bytes == 2)
	    return get_reg (r2);
	  break;
	}
    }
  else
    {
      switch (argp)
	{
	case 1:
	  if (bytes == 1)
	    return get_reg (r0l);
	  if (bytes == 2)
	    return get_reg (r0);
	  break;
	}
    }
  if (bytes == 0)
    bytes = 2;
  switch (bytes)
    {
    case 1:
      rv = mem_get_qi (get_reg (sp) + stackp);
      if (A24)
	stackp++;
      break;
    case 2:
      rv = mem_get_hi (get_reg (sp) + stackp);
      break;
    case 3:
      rv = mem_get_psi (get_reg (sp) + stackp);
      if (A24)
	stackp++;
      break;
    case 4:
      rv = mem_get_si (get_reg (sp) + stackp);
      break;
    }
  stackp += bytes;
  return rv;
}

static void
read_target (char *buffer, int address, int count, int asciiz)
{
  char byte;
  while (count > 0)
    {
      byte = mem_get_qi (address++);
      *buffer++ = byte;
      if (asciiz && (byte == 0))
	return;
      count--;
    }
}

static void
write_target (char *buffer, int address, int count, int asciiz)
{
  char byte;
  while (count > 0)
    {
      byte = *buffer++;
      mem_put_qi (address++, byte);
      if (asciiz && (byte == 0))
	return;
      count--;
    }
}

#define PTRSZ (A16 ? 2 : 3)

static char *callnames[] = {
  "SYS_zero",
  "SYS_exit",
  "SYS_open",
  "SYS_close",
  "SYS_read",
  "SYS_write",
  "SYS_lseek",
  "SYS_unlink",
  "SYS_getpid",
  "SYS_kill",
  "SYS_fstat",
  "SYS_sbrk",
  "SYS_argvlen",
  "SYS_argv",
  "SYS_chdir",
  "SYS_stat",
  "SYS_chmod",
  "SYS_utime",
  "SYS_time",
  "SYS_gettimeofday",
  "SYS_times",
  "SYS_link"
};

void
m32c_syscall (int id)
{
  static char buf[256];
  int rv;

  argp = 0;
  stackp = A16 ? 3 : 4;
  if (trace)
    printf ("\033[31m/* SYSCALL(%d) = %s */\033[0m\n", id, callnames[id]);
  switch (id)
    {
    case SYS_exit:
      {
	int ec = arg (2);
	if (verbose)
	  printf ("[exit %d]\n", ec);
	step_result = M32C_MAKE_EXITED (ec);
      }
      break;

    case SYS_open:
      {
	int path = arg (PTRSZ);
	int oflags = arg (2);
	int cflags = arg (2);

	read_target (buf, path, 256, 1);
	if (trace)
	  printf ("open(\"%s\",0x%x,%#o) = ", buf, oflags, cflags);

	if (callbacks)
	  /* The callback vector ignores CFLAGS.  */
	  rv = callbacks->open (callbacks, buf, oflags);
	else
	  {
	    int h_oflags = 0;

	    if (oflags & 0x0001)
	      h_oflags |= O_WRONLY;
	    if (oflags & 0x0002)
	      h_oflags |= O_RDWR;
	    if (oflags & 0x0200)
	      h_oflags |= O_CREAT;
	    if (oflags & 0x0008)
	      h_oflags |= O_APPEND;
	    if (oflags & 0x0400)
	      h_oflags |= O_TRUNC;
	    rv = open (buf, h_oflags, cflags);
	  }
	if (trace)
	  printf ("%d\n", rv);
	put_reg (r0, rv);
      }
      break;

    case SYS_close:
      {
	int fd = arg (2);

	if (callbacks)
	  rv = callbacks->close (callbacks, fd);
	else if (fd > 2)
	  rv = close (fd);
	else
	  rv = 0;
	if (trace)
	  printf ("close(%d) = %d\n", fd, rv);
	put_reg (r0, rv);
      }
      break;

    case SYS_read:
      {
	int fd = arg (2);
	int addr = arg (PTRSZ);
	int count = arg (2);

	if (count > sizeof (buf))
	  count = sizeof (buf);
	if (callbacks)
	  rv = callbacks->read (callbacks, fd, buf, count);
	else
	  rv = read (fd, buf, count);
	if (trace)
	  printf ("read(%d,%d) = %d\n", fd, count, rv);
	if (rv > 0)
	  write_target (buf, addr, rv, 0);
	put_reg (r0, rv);
      }
      break;

    case SYS_write:
      {
	int fd = arg (2);
	int addr = arg (PTRSZ);
	int count = arg (2);

	if (count > sizeof (buf))
	  count = sizeof (buf);
	if (trace)
	  printf ("write(%d,0x%x,%d)\n", fd, addr, count);
	read_target (buf, addr, count, 0);
	if (trace)
	  fflush (stdout);
	if (callbacks)
	  rv = callbacks->write (callbacks, fd, buf, count);
	else
	  rv = write (fd, buf, count);
	if (trace)
	  printf ("write(%d,%d) = %d\n", fd, count, rv);
	put_reg (r0, rv);
      }
      break;

    case SYS_getpid:
      put_reg (r0, 42);
      break;

    case SYS_gettimeofday:
      {
	int tvaddr = arg (PTRSZ);
	struct timeval tv;

	rv = gettimeofday (&tv, 0);
	if (trace)
	  printf ("gettimeofday: %ld sec %ld usec to 0x%x\n", tv.tv_sec,
		  tv.tv_usec, tvaddr);
	mem_put_si (tvaddr, tv.tv_sec);
	mem_put_si (tvaddr + 4, tv.tv_usec);
	put_reg (r0, rv);
      }
      break;

    case SYS_kill:
      {
	int pid = arg (2);
	int sig = arg (2);
	if (pid == 42)
	  {
	    if (verbose)
	      printf ("[signal %d]\n", sig);
	    step_result = M32C_MAKE_STOPPED (sig);
	  }
      }
      break;

    case 11:
      {
	int heaptop_arg = arg (PTRSZ);
	if (trace)
	  printf ("sbrk: heap top set to %x\n", heaptop_arg);
	heaptop = heaptop_arg;
	if (heapbottom == 0)
	  heapbottom = heaptop_arg;
      }
      break;

    }
}