1 /* syscalls.c --- implement system calls for the RX simulator.
3 Copyright (C) 2005-2017 Free Software Foundation, Inc.
4 Contributed by Red Hat, Inc.
6 This file is part of the GNU simulators.
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.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
29 #include "gdb/callback.h"
37 /* The current syscall callbacks we're using. */
38 static struct host_callback_struct
*callbacks
;
41 set_callbacks (struct host_callback_struct
*cb
)
46 struct host_callback_struct
*
53 /* Arguments 1..4 are in R1..R4, remainder on stack.
55 Return value in R1..R4 as needed.
56 structs bigger than 16 bytes: pointer pushed on stack last
58 We only support arguments that fit in general registers.
60 The system call number is in R5. We expect ssycalls to look like
78 return get_reg (argp
);
80 rv
= mem_get_si (get_reg (sp
) + stackp
);
86 read_target (char *buffer
, int address
, int count
, int asciiz
)
91 byte
= mem_get_qi (address
++);
93 if (asciiz
&& (byte
== 0))
100 write_target (char *buffer
, int address
, int count
, int asciiz
)
106 mem_put_qi (address
++, byte
);
107 if (asciiz
&& (byte
== 0))
113 #define PTRSZ (A16 ? 2 : 3)
115 static char *callnames
[] = {
143 static char buf
[256];
149 printf ("\033[31m/* SYSCALL(%d) = %s */\033[0m\n", id
, id
<= SYS_link
? callnames
[id
] : "unknown");
156 printf ("[exit %d]\n", ec
);
157 return RX_MAKE_EXITED (ec
);
164 /* The open function is defined as taking a variable number of arguments
165 because the third parameter to it is optional:
166 open (const char * filename, int flags, ...);
167 Hence the oflags and cflags arguments will be on the stack and we need
168 to skip the (empty) argument registers r3 and r4. */
173 read_target (buf
, path
, 256, 1);
175 printf ("open(\"%s\",0x%x,%#o) = ", buf
, oflags
, cflags
);
178 /* The callback vector ignores CFLAGS. */
179 rv
= callbacks
->open (callbacks
, buf
, oflags
);
185 h_oflags
|= O_WRONLY
;
191 h_oflags
|= O_APPEND
;
194 rv
= open (buf
, h_oflags
, cflags
);
207 rv
= callbacks
->close (callbacks
, fd
);
213 printf ("close(%d) = %d\n", fd
, rv
);
224 if (count
> sizeof (buf
))
225 count
= sizeof (buf
);
227 rv
= callbacks
->read (callbacks
, fd
, buf
, count
);
229 rv
= read (fd
, buf
, count
);
231 printf ("read(%d,%d) = %d\n", fd
, count
, rv
);
233 write_target (buf
, addr
, rv
, 0);
244 if (count
> sizeof (buf
))
245 count
= sizeof (buf
);
247 printf ("write(%d,0x%x,%d)\n", fd
, addr
, count
);
248 read_target (buf
, addr
, count
, 0);
252 rv
= callbacks
->write (callbacks
, fd
, buf
, count
);
254 rv
= write (fd
, buf
, count
);
256 printf ("write(%d,%d) = %d\n", fd
, count
, rv
);
265 case SYS_gettimeofday
:
270 rv
= gettimeofday (&tv
, 0);
272 printf ("gettimeofday: %ld sec %ld usec to 0x%x\n", tv
.tv_sec
,
274 mem_put_si (tvaddr
, tv
.tv_sec
);
275 mem_put_si (tvaddr
+ 4, tv
.tv_usec
);
287 printf ("[signal %d]\n", sig
);
288 return RX_MAKE_STOPPED (sig
);
295 int heaptop_arg
= arg ();
297 printf ("sbrk: heap top set to %x\n", heaptop_arg
);
298 heaptop
= heaptop_arg
;
300 heapbottom
= heaptop_arg
;
307 mem_put_si (addr
, rx_cycles
+ mem_usage_cycles());
312 return RX_MAKE_STEPPED ();
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