334 lines
6.2 KiB
C
334 lines
6.2 KiB
C
/* syscalls.c --- implement system calls for the M32C simulator.
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Copyright (C) 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
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Contributed by Red Hat, Inc.
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This file is part of the GNU simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include "gdb/callback.h"
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#include "cpu.h"
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#include "mem.h"
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#include "syscalls.h"
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#include "syscall.h"
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/* The current syscall callbacks we're using. */
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static struct host_callback_struct *callbacks;
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void
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set_callbacks (struct host_callback_struct *cb)
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{
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callbacks = cb;
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}
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/* A16 ABI: arg1 in r1l (QI) or r1 (HI) or stack
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arg2 in r2 (HI) or stack
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arg3..N on stack
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padding: none
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A24 ABI: arg1 in r0l (QI) or r0 (HI) or stack
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arg2..N on stack
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padding: qi->hi
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return value in r0l (QI) r0 (HI) r2r0 (SI)
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structs: pointer pushed on stack last
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*/
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int argp, stackp;
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static int
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arg (int bytes)
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{
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int rv = 0;
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argp++;
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if (A16)
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{
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switch (argp)
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{
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case 1:
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if (bytes == 1)
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return get_reg (r1l);
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if (bytes == 2)
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return get_reg (r1);
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break;
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case 2:
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if (bytes == 2)
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return get_reg (r2);
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break;
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}
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}
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else
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{
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switch (argp)
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{
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case 1:
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if (bytes == 1)
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return get_reg (r0l);
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if (bytes == 2)
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return get_reg (r0);
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break;
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}
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}
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if (bytes == 0)
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bytes = 2;
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switch (bytes)
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{
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case 1:
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rv = mem_get_qi (get_reg (sp) + stackp);
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if (A24)
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stackp++;
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break;
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case 2:
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rv = mem_get_hi (get_reg (sp) + stackp);
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break;
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case 3:
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rv = mem_get_psi (get_reg (sp) + stackp);
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if (A24)
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stackp++;
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break;
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case 4:
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rv = mem_get_si (get_reg (sp) + stackp);
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break;
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}
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stackp += bytes;
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return rv;
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}
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static void
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read_target (char *buffer, int address, int count, int asciiz)
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{
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char byte;
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while (count > 0)
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{
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byte = mem_get_qi (address++);
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*buffer++ = byte;
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if (asciiz && (byte == 0))
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return;
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count--;
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}
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}
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static void
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write_target (char *buffer, int address, int count, int asciiz)
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{
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char byte;
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while (count > 0)
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{
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byte = *buffer++;
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mem_put_qi (address++, byte);
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if (asciiz && (byte == 0))
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return;
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count--;
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}
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}
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#define PTRSZ (A16 ? 2 : 3)
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static char *callnames[] = {
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"SYS_zero",
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"SYS_exit",
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"SYS_open",
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"SYS_close",
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"SYS_read",
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"SYS_write",
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"SYS_lseek",
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"SYS_unlink",
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"SYS_getpid",
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"SYS_kill",
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"SYS_fstat",
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"SYS_sbrk",
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"SYS_argvlen",
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"SYS_argv",
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"SYS_chdir",
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"SYS_stat",
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"SYS_chmod",
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"SYS_utime",
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"SYS_time",
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"SYS_gettimeofday",
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"SYS_times",
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"SYS_link"
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};
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void
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m32c_syscall (int id)
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{
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static char buf[256];
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int rv;
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argp = 0;
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stackp = A16 ? 3 : 4;
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if (trace)
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printf ("\033[31m/* SYSCALL(%d) = %s */\033[0m\n", id, callnames[id]);
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switch (id)
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{
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case SYS_exit:
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{
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int ec = arg (2);
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if (verbose)
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printf ("[exit %d]\n", ec);
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step_result = M32C_MAKE_EXITED (ec);
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}
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break;
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case SYS_open:
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{
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int path = arg (PTRSZ);
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int oflags = arg (2);
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int cflags = arg (2);
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read_target (buf, path, 256, 1);
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if (trace)
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printf ("open(\"%s\",0x%x,%#o) = ", buf, oflags, cflags);
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if (callbacks)
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/* The callback vector ignores CFLAGS. */
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rv = callbacks->open (callbacks, buf, oflags);
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else
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{
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int h_oflags = 0;
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if (oflags & 0x0001)
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h_oflags |= O_WRONLY;
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if (oflags & 0x0002)
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h_oflags |= O_RDWR;
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if (oflags & 0x0200)
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h_oflags |= O_CREAT;
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if (oflags & 0x0008)
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h_oflags |= O_APPEND;
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if (oflags & 0x0400)
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h_oflags |= O_TRUNC;
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rv = open (buf, h_oflags, cflags);
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}
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if (trace)
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printf ("%d\n", rv);
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put_reg (r0, rv);
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}
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break;
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case SYS_close:
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{
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int fd = arg (2);
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if (callbacks)
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rv = callbacks->close (callbacks, fd);
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else if (fd > 2)
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rv = close (fd);
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else
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rv = 0;
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if (trace)
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printf ("close(%d) = %d\n", fd, rv);
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put_reg (r0, rv);
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}
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break;
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case SYS_read:
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{
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int fd = arg (2);
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int addr = arg (PTRSZ);
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int count = arg (2);
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if (count > sizeof (buf))
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count = sizeof (buf);
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if (callbacks)
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rv = callbacks->read (callbacks, fd, buf, count);
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else
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rv = read (fd, buf, count);
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if (trace)
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printf ("read(%d,%d) = %d\n", fd, count, rv);
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if (rv > 0)
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write_target (buf, addr, rv, 0);
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put_reg (r0, rv);
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}
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break;
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case SYS_write:
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{
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int fd = arg (2);
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int addr = arg (PTRSZ);
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int count = arg (2);
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if (count > sizeof (buf))
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count = sizeof (buf);
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if (trace)
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printf ("write(%d,0x%x,%d)\n", fd, addr, count);
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read_target (buf, addr, count, 0);
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if (trace)
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fflush (stdout);
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if (callbacks)
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rv = callbacks->write (callbacks, fd, buf, count);
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else
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rv = write (fd, buf, count);
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if (trace)
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printf ("write(%d,%d) = %d\n", fd, count, rv);
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put_reg (r0, rv);
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}
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break;
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case SYS_getpid:
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put_reg (r0, 42);
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break;
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case SYS_gettimeofday:
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{
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int tvaddr = arg (PTRSZ);
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struct timeval tv;
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rv = gettimeofday (&tv, 0);
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if (trace)
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printf ("gettimeofday: %ld sec %ld usec to 0x%x\n", tv.tv_sec,
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tv.tv_usec, tvaddr);
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mem_put_si (tvaddr, tv.tv_sec);
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mem_put_si (tvaddr + 4, tv.tv_usec);
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put_reg (r0, rv);
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}
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break;
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case SYS_kill:
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{
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int pid = arg (2);
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int sig = arg (2);
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if (pid == 42)
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{
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if (verbose)
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printf ("[signal %d]\n", sig);
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step_result = M32C_MAKE_STOPPED (sig);
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}
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}
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break;
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case 11:
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{
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int heaptop_arg = arg (PTRSZ);
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if (trace)
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printf ("sbrk: heap top set to %x\n", heaptop_arg);
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heaptop = heaptop_arg;
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if (heapbottom == 0)
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heapbottom = heaptop_arg;
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}
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break;
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}
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}
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