m68k-semi.c
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/*
* m68k/ColdFire Semihosting ssycall interface
*
* Copyright (c) 2005 CodeSourcery, LLC. Written by Paul Brook.
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/time.h>
#include <time.h>
#include "qemu.h"
#define HOSTED_EXIT 0
#define HOSTED_PUTCHAR 1 /* Obsolete */
#define HOSTED_OPEN 2
#define HOSTED_CLOSE 3
#define HOSTED_READ 4
#define HOSTED_WRITE 5
#define HOSTED_LSEEK 6
#define HOSTED_RENAME 7
#define HOSTED_UNLINK 8
#define HOSTED_STAT 9
#define HOSTED_FSTAT 10
#define HOSTED_GETTIMEOFDAY 11
#define HOSTED_ISATTY 12
#define HOSTED_SYSTEM 13
typedef uint32_t gdb_mode_t;
typedef uint32_t gdb_time_t;
struct m68k_gdb_stat {
uint32_t gdb_st_dev; /* device */
uint32_t gdb_st_ino; /* inode */
gdb_mode_t gdb_st_mode; /* protection */
uint32_t gdb_st_nlink; /* number of hard links */
uint32_t gdb_st_uid; /* user ID of owner */
uint32_t gdb_st_gid; /* group ID of owner */
uint32_t gdb_st_rdev; /* device type (if inode device) */
uint64_t gdb_st_size; /* total size, in bytes */
uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
uint64_t gdb_st_blocks; /* number of blocks allocated */
gdb_time_t gdb_st_atime; /* time of last access */
gdb_time_t gdb_st_mtime; /* time of last modification */
gdb_time_t gdb_st_ctime; /* time of last change */
};
struct gdb_timeval {
gdb_time_t tv_sec; /* second */
uint64_t tv_usec; /* microsecond */
};
#define GDB_O_RDONLY 0x0
#define GDB_O_WRONLY 0x1
#define GDB_O_RDWR 0x2
#define GDB_O_APPEND 0x8
#define GDB_O_CREAT 0x200
#define GDB_O_TRUNC 0x400
#define GDB_O_EXCL 0x800
static int translate_openflags(int flags)
{
int hf;
if (flags & GDB_O_WRONLY)
hf = O_WRONLY;
else if (flags & GDB_O_RDWR)
hf = O_RDWR;
else
hf = O_RDONLY;
if (flags & GDB_O_APPEND) hf |= O_APPEND;
if (flags & GDB_O_CREAT) hf |= O_CREAT;
if (flags & GDB_O_TRUNC) hf |= O_TRUNC;
if (flags & GDB_O_EXCL) hf |= O_EXCL;
return hf;
}
static void translate_stat(struct m68k_gdb_stat *p, struct stat *s)
{
p->gdb_st_dev = tswap16(s->st_dev);
p->gdb_st_ino = tswap16(s->st_ino);
p->gdb_st_mode = tswap32(s->st_mode);
p->gdb_st_nlink = tswap16(s->st_nlink);
p->gdb_st_uid = tswap16(s->st_uid);
p->gdb_st_gid = tswap16(s->st_gid);
p->gdb_st_rdev = tswap16(s->st_rdev);
p->gdb_st_size = tswap32(s->st_size);
p->gdb_st_atime = tswap32(s->st_atime);
p->gdb_st_mtime = tswap32(s->st_mtime);
p->gdb_st_ctime = tswap32(s->st_ctime);
p->gdb_st_blksize = tswap32(s->st_blksize);
p->gdb_st_blocks = tswap32(s->st_blocks);
}
static inline uint32_t check_err(CPUM68KState *env, uint32_t code)
{
if (code == (uint32_t)-1) {
env->sr |= CCF_C;
} else {
env->sr &= ~CCF_C;
env->dregs[0] = code;
}
return code;
}
#define ARG(x) tswap32(args[x])
void do_m68k_semihosting(CPUM68KState *env, int nr)
{
uint32_t *args;
args = (uint32_t *)env->dregs[1];
switch (nr) {
case HOSTED_EXIT:
exit(env->dregs[0]);
case HOSTED_OPEN:
/* Assume name is NULL terminated. */
check_err(env, open((char *)ARG(0), translate_openflags(ARG(2)),
ARG(3)));
break;
case HOSTED_CLOSE:
{
/* Ignore attempts to close stdin/out/err. */
int fd = ARG(0);
if (fd > 2)
check_err(env, close(fd));
else
check_err(env, 0);
break;
}
case HOSTED_READ:
check_err(env, read(ARG(0), (void *)ARG(1), ARG(2)));
break;
case HOSTED_WRITE:
check_err(env, write(ARG(0), (void *)ARG(1), ARG(2)));
break;
case HOSTED_LSEEK:
{
uint64_t off;
off = (uint32_t)ARG(2) | ((uint64_t)ARG(1) << 32);
check_err(env, lseek(ARG(0), off, ARG(3)));
}
break;
case HOSTED_RENAME:
/* Assume names are NULL terminated. */
check_err(env, rename((char *)ARG(0), (char *)ARG(2)));
break;
case HOSTED_UNLINK:
/* Assume name is NULL terminated. */
check_err(env, unlink((char *)ARG(0)));
break;
case HOSTED_STAT:
/* Assume name is NULL terminated. */
{
struct stat s;
int rc;
rc = check_err(env, stat((char *)ARG(0), &s));
if (rc == 0) {
translate_stat((struct m68k_gdb_stat *)ARG(2), &s);
}
}
break;
case HOSTED_FSTAT:
{
struct stat s;
int rc;
rc = check_err(env, fstat(ARG(0), &s));
if (rc == 0) {
translate_stat((struct m68k_gdb_stat *)ARG(1), &s);
}
}
break;
case HOSTED_GETTIMEOFDAY:
{
struct timeval tv;
struct gdb_timeval *p;
int rc;
rc = check_err(env, gettimeofday(&tv, NULL));
if (rc != 0) {
p = (struct gdb_timeval *)ARG(0);
p->tv_sec = tswap32(tv.tv_sec);
p->tv_usec = tswap64(tv.tv_usec);
}
}
break;
case HOSTED_ISATTY:
check_err(env, isatty(ARG(0)));
break;
case HOSTED_SYSTEM:
/* Assume name is NULL terminated. */
check_err(env, system((char *)ARG(0)));
break;
default:
cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);
}
}