[qemu.git] / m68k-semi.c

/*
 *  m68k/ColdFire Semihosting syscall interface
 *
 *  Copyright (c) 2005-2007 CodeSourcery.
 *
 *  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., 51 Franklin Street - Fifth Floor, Boston,
 *  MA 02110-1301, 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 "cpu.h"
#if defined(CONFIG_USER_ONLY)
#include "qemu.h"
#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "qemu-common.h"
#include "sysemu.h"
#include "gdbstub.h"
#include "softmmu-semi.h"
#endif

#define HOSTED_EXIT  0
#define HOSTED_INIT_SIM 1
#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 */
} __attribute__((packed));

struct gdb_timeval {
  gdb_time_t tv_sec;  /* second */
  uint64_t tv_usec;   /* microsecond */
} __attribute__((packed));

#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(CPUState *env, target_ulong addr, struct stat *s)
{
    struct m68k_gdb_stat *p;

    if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
        /* FIXME - should this return an error code? */
        return;
    p->gdb_st_dev = cpu_to_be32(s->st_dev);
    p->gdb_st_ino = cpu_to_be32(s->st_ino);
    p->gdb_st_mode = cpu_to_be32(s->st_mode);
    p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
    p->gdb_st_uid = cpu_to_be32(s->st_uid);
    p->gdb_st_gid = cpu_to_be32(s->st_gid);
    p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
    p->gdb_st_size = cpu_to_be64(s->st_size);
#ifdef _WIN32
    /* Windows stat is missing some fields.  */
    p->gdb_st_blksize = 0;
    p->gdb_st_blocks = 0;
#else
    p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
    p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
#endif
    p->gdb_st_atime = cpu_to_be32(s->st_atime);
    p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
    p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
    unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
}

static int m68k_semi_is_fseek;

static void m68k_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
{
    target_ulong args;

    args = env->dregs[1];
    if (m68k_semi_is_fseek) {
        /* FIXME: We've already lost the high bits of the fseek
           return value.  */
        /* FIXME - handle put_user() failure */
        put_user_u32(0, args);
        args += 4;
        m68k_semi_is_fseek = 0;
    }
    /* FIXME - handle put_user() failure */
    put_user_u32(ret, args);
    put_user_u32(errno, args + 4);
}

#define ARG(n)					\
({						\
    target_ulong __arg;				\
    /* FIXME - handle get_user() failure */	\
    get_user_ual(__arg, args + (n) * 4);	\
    __arg;					\
})
#define PARG(x) ((unsigned long)ARG(x))
void do_m68k_semihosting(CPUM68KState *env, int nr)
{
    uint32_t args;
    void *p;
    void *q;
    uint32_t len;
    uint32_t result;

    args = env->dregs[1];
    switch (nr) {
    case HOSTED_EXIT:
        exit(env->dregs[0]);
    case HOSTED_OPEN:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", ARG(0), (int)ARG(1),
                           ARG(2), ARG(3));
            return;
        } else {
            if (!(p = lock_user_string(ARG(0)))) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = open(p, translate_openflags(ARG(2)), ARG(3));
                unlock_user(p, ARG(0), 0);
            }
        }
        break;
    case HOSTED_CLOSE:
        {
            /* Ignore attempts to close stdin/out/err.  */
            int fd = ARG(0);
            if (fd > 2) {
                if (use_gdb_syscalls()) {
                    gdb_do_syscall(m68k_semi_cb, "close,%x", ARG(0));
                    return;
                } else {
                    result = close(fd);
                }
            } else {
                result = 0;
            }
            break;
        }
    case HOSTED_READ:
        len = ARG(2);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
                           ARG(0), ARG(1), len);
            return;
        } else {
            if (!(p = lock_user(VERIFY_WRITE, ARG(1), len, 0))) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = read(ARG(0), p, len);
                unlock_user(p, ARG(1), len);
            }
        }
        break;
    case HOSTED_WRITE:
        len = ARG(2);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
                           ARG(0), ARG(1), len);
            return;
        } else {
            if (!(p = lock_user(VERIFY_READ, ARG(1), len, 1))) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = write(ARG(0), p, len);
                unlock_user(p, ARG(0), 0);
            }
        }
        break;
    case HOSTED_LSEEK:
        {
            uint64_t off;
            off = (uint32_t)ARG(2) | ((uint64_t)ARG(1) << 32);
            if (use_gdb_syscalls()) {
                m68k_semi_is_fseek = 1;
                gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
                               ARG(0), off, ARG(3));
            } else {
                off = lseek(ARG(0), off, ARG(3));
                /* FIXME - handle put_user() failure */
                put_user_u32(off >> 32, args);
                put_user_u32(off, args + 4);
                put_user_u32(errno, args + 8);
            }
            return;
        }
    case HOSTED_RENAME:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
                           ARG(0), (int)ARG(1), ARG(2), (int)ARG(3));
            return;
        } else {
            p = lock_user_string(ARG(0));
            q = lock_user_string(ARG(2));
            if (!p || !q) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = rename(p, q);
            }
            unlock_user(p, ARG(0), 0);
            unlock_user(q, ARG(2), 0);
        }
        break;
    case HOSTED_UNLINK:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "unlink,%s",
                           ARG(0), (int)ARG(1));
            return;
        } else {
            if (!(p = lock_user_string(ARG(0)))) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = unlink(p);
                unlock_user(p, ARG(0), 0);
            }
        }
        break;
    case HOSTED_STAT:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
                           ARG(0), (int)ARG(1), ARG(2));
            return;
        } else {
            struct stat s;
            if (!(p = lock_user_string(ARG(0)))) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = stat(p, &s);
                unlock_user(p, ARG(0), 0);
            }
            if (result == 0) {
                translate_stat(env, ARG(2), &s);
            }
        }
        break;
    case HOSTED_FSTAT:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
                           ARG(0), ARG(1));
            return;
        } else {
            struct stat s;
            result = fstat(ARG(0), &s);
            if (result == 0) {
                translate_stat(env, ARG(1), &s);
            }
        }
        break;
    case HOSTED_GETTIMEOFDAY:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
                           ARG(0), ARG(1));
            return;
        } else {
            qemu_timeval tv;
            struct gdb_timeval *p;
            result = qemu_gettimeofday(&tv);
            if (result != 0) {
                if (!(p = lock_user(VERIFY_WRITE,
                                    ARG(0), sizeof(struct gdb_timeval), 0))) {
                    /* FIXME - check error code? */
                    result = -1;
                } else {
                    p->tv_sec = cpu_to_be32(tv.tv_sec);
                    p->tv_usec = cpu_to_be64(tv.tv_usec);
                    unlock_user(p, ARG(0), sizeof(struct gdb_timeval));
                }
            }
        }
        break;
    case HOSTED_ISATTY:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "isatty,%x", ARG(0));
            return;
        } else {
            result = isatty(ARG(0));
        }
        break;
    case HOSTED_SYSTEM:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "system,%s",
                           ARG(0), (int)ARG(1));
            return;
        } else {
            if (!(p = lock_user_string(ARG(0)))) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = system(p);
                unlock_user(p, ARG(0), 0);
            }
        }
        break;
    case HOSTED_INIT_SIM:
#if defined(CONFIG_USER_ONLY)
        {
        TaskState *ts = env->opaque;
        /* Allocate the heap using sbrk.  */
        if (!ts->heap_limit) {
            long ret;
            uint32_t size;
            uint32_t base;

            base = do_brk(0);
            size = SEMIHOSTING_HEAP_SIZE;
            /* Try a big heap, and reduce the size if that fails.  */
            for (;;) {
                ret = do_brk(base + size);
                if (ret != -1)
                    break;
                size >>= 1;
            }
            ts->heap_limit = base + size;
        }
        /* This call may happen before we have writable memory, so return
           values directly in registers.  */
        env->dregs[1] = ts->heap_limit;
        env->aregs[7] = ts->stack_base;
        }
#else
        /* FIXME: This is wrong for boards where RAM does not start at
           address zero.  */
        env->dregs[1] = ram_size;
        env->aregs[7] = ram_size;
#endif
        return;
    default:
        cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);
        result = 0;
    }
    /* FIXME - handle put_user() failure */
    put_user_u32(result, args);
    put_user_u32(errno, args + 4);
}
Commit	Line	Data
a87295e8 PB	1	/*
a87295e8 PB	2	* m68k/ColdFire Semihosting syscall interface
5fafdf24	3	*
a87295e8 PB	4	* Copyright (c) 2005-2007 CodeSourcery.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
530e7615 BS	18	* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
530e7615 BS	19	* MA 02110-1301, USA.
a87295e8 PB	20	*/
	21
	22	#include <sys/types.h>
	23	#include <sys/stat.h>
	24	#include <errno.h>
	25	#include <fcntl.h>
	26	#include <unistd.h>
	27	#include <stdlib.h>
	28	#include <stdio.h>
	29	#include <sys/time.h>
	30	#include <time.h>
	31
	32	#include "cpu.h"
	33	#if defined(CONFIG_USER_ONLY)
	34	#include "qemu.h"
	35	#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
	36	#else
87ecb68b PB	37	#include "qemu-common.h"
	38	#include "sysemu.h"
	39	#include "gdbstub.h"
a87295e8 PB	40	#include "softmmu-semi.h"
	41	#endif
	42
	43	#define HOSTED_EXIT 0
	44	#define HOSTED_INIT_SIM 1
	45	#define HOSTED_OPEN 2
	46	#define HOSTED_CLOSE 3
	47	#define HOSTED_READ 4
	48	#define HOSTED_WRITE 5
	49	#define HOSTED_LSEEK 6
	50	#define HOSTED_RENAME 7
	51	#define HOSTED_UNLINK 8
	52	#define HOSTED_STAT 9
	53	#define HOSTED_FSTAT 10
	54	#define HOSTED_GETTIMEOFDAY 11
	55	#define HOSTED_ISATTY 12
	56	#define HOSTED_SYSTEM 13
	57
	58	typedef uint32_t gdb_mode_t;
	59	typedef uint32_t gdb_time_t;
	60
	61	struct m68k_gdb_stat {
	62	uint32_t gdb_st_dev; /* device */
	63	uint32_t gdb_st_ino; /* inode */
	64	gdb_mode_t gdb_st_mode; /* protection */
	65	uint32_t gdb_st_nlink; /* number of hard links */
	66	uint32_t gdb_st_uid; /* user ID of owner */
	67	uint32_t gdb_st_gid; /* group ID of owner */
	68	uint32_t gdb_st_rdev; /* device type (if inode device) */
	69	uint64_t gdb_st_size; /* total size, in bytes */
	70	uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
	71	uint64_t gdb_st_blocks; /* number of blocks allocated */
	72	gdb_time_t gdb_st_atime; /* time of last access */
	73	gdb_time_t gdb_st_mtime; /* time of last modification */
	74	gdb_time_t gdb_st_ctime; /* time of last change */
	75	} __attribute__((packed));
	76
	77	struct gdb_timeval {
	78	gdb_time_t tv_sec; /* second */
	79	uint64_t tv_usec; /* microsecond */
	80	} __attribute__((packed));
	81
	82	#define GDB_O_RDONLY 0x0
	83	#define GDB_O_WRONLY 0x1
	84	#define GDB_O_RDWR 0x2
	85	#define GDB_O_APPEND 0x8
	86	#define GDB_O_CREAT 0x200
	87	#define GDB_O_TRUNC 0x400
	88	#define GDB_O_EXCL 0x800
	89
	90	static int translate_openflags(int flags)
	91	{
	92	int hf;
	93
	94	if (flags & GDB_O_WRONLY)
	95	hf = O_WRONLY;
	96	else if (flags & GDB_O_RDWR)
	97	hf = O_RDWR;
	98	else
	99	hf = O_RDONLY;
	100
	101	if (flags & GDB_O_APPEND) hf \|= O_APPEND;
	102	if (flags & GDB_O_CREAT) hf \|= O_CREAT;
	103	if (flags & GDB_O_TRUNC) hf \|= O_TRUNC;
104	if (flags & GDB_O_EXCL) hf \|= O_EXCL;
105
106	return hf;
107	}
108
109	static void translate_stat(CPUState env, target_ulong addr, struct stat s)
110	{
111	struct m68k_gdb_stat *p;
112
579a97f7 FB	113	if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
	114	/* FIXME - should this return an error code? */
	115	return;
a87295e8 PB	116	p->gdb_st_dev = cpu_to_be32(s->st_dev);
	117	p->gdb_st_ino = cpu_to_be32(s->st_ino);
	118	p->gdb_st_mode = cpu_to_be32(s->st_mode);
	119	p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
	120	p->gdb_st_uid = cpu_to_be32(s->st_uid);
	121	p->gdb_st_gid = cpu_to_be32(s->st_gid);
	122	p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
	123	p->gdb_st_size = cpu_to_be64(s->st_size);
29b3a662 PB	124	#ifdef _WIN32
	125	/* Windows stat is missing some fields. */
	126	p->gdb_st_blksize = 0;
	127	p->gdb_st_blocks = 0;
	128	#else
a87295e8 PB	129	p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
a87295e8 PB	130	p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
29b3a662	131	#endif
a87295e8 PB	132	p->gdb_st_atime = cpu_to_be32(s->st_atime);
	133	p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
	134	p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
	135	unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
	136	}
	137
	138	static int m68k_semi_is_fseek;
	139
	140	static void m68k_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
	141	{
	142	target_ulong args;
	143
	144	args = env->dregs[1];
	145	if (m68k_semi_is_fseek) {
	146	/* FIXME: We've already lost the high bits of the fseek
	147	return value. */
2f619698 FB	148	/* FIXME - handle put_user() failure */
2f619698 FB	149	put_user_u32(0, args);
a87295e8 PB	150	args += 4;
	151	m68k_semi_is_fseek = 0;
	152	}
2f619698 FB	153	/* FIXME - handle put_user() failure */
	154	put_user_u32(ret, args);
	155	put_user_u32(errno, args + 4);
a87295e8 PB	156	}
a87295e8 PB	157
2f619698 FB	158	#define ARG(n) \
	159	({ \
	160	target_ulong __arg; \
	161	/* FIXME - handle get_user() failure */ \
	162	get_user_ual(__arg, args + (n) * 4); \
	163	__arg; \
	164	})
a87295e8 PB	165	#define PARG(x) ((unsigned long)ARG(x))
	166	void do_m68k_semihosting(CPUM68KState *env, int nr)
	167	{
	168	uint32_t args;
	169	void *p;
	170	void *q;
	171	uint32_t len;
	172	uint32_t result;
	173
	174	args = env->dregs[1];
	175	switch (nr) {
	176	case HOSTED_EXIT:
	177	exit(env->dregs[0]);
	178	case HOSTED_OPEN:
	179	if (use_gdb_syscalls()) {
	180	gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", ARG(0), (int)ARG(1),
	181	ARG(2), ARG(3));
	182	return;
	183	} else {
579a97f7 FB	184	if (!(p = lock_user_string(ARG(0)))) {
	185	/* FIXME - check error code? */
	186	result = -1;
	187	} else {
	188	result = open(p, translate_openflags(ARG(2)), ARG(3));
	189	unlock_user(p, ARG(0), 0);
	190	}
a87295e8 PB	191	}
	192	break;
	193	case HOSTED_CLOSE:
	194	{
	195	/* Ignore attempts to close stdin/out/err. */
	196	int fd = ARG(0);
	197	if (fd > 2) {
	198	if (use_gdb_syscalls()) {
	199	gdb_do_syscall(m68k_semi_cb, "close,%x", ARG(0));
	200	return;
	201	} else {
	202	result = close(fd);
	203	}
	204	} else {
	205	result = 0;
	206	}
	207	break;
	208	}
	209	case HOSTED_READ:
	210	len = ARG(2);
	211	if (use_gdb_syscalls()) {
	212	gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
	213	ARG(0), ARG(1), len);
	214	return;
	215	} else {
579a97f7 FB	216	if (!(p = lock_user(VERIFY_WRITE, ARG(1), len, 0))) {
	217	/* FIXME - check error code? */
	218	result = -1;
	219	} else {
	220	result = read(ARG(0), p, len);
	221	unlock_user(p, ARG(1), len);
	222	}
a87295e8 PB	223	}
	224	break;
	225	case HOSTED_WRITE:
	226	len = ARG(2);
	227	if (use_gdb_syscalls()) {
	228	gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
	229	ARG(0), ARG(1), len);
	230	return;
	231	} else {
579a97f7 FB	232	if (!(p = lock_user(VERIFY_READ, ARG(1), len, 1))) {
	233	/* FIXME - check error code? */
	234	result = -1;
	235	} else {
	236	result = write(ARG(0), p, len);
	237	unlock_user(p, ARG(0), 0);
	238	}
a87295e8 PB	239	}
	240	break;
	241	case HOSTED_LSEEK:
	242	{
	243	uint64_t off;
	244	off = (uint32_t)ARG(2) \| ((uint64_t)ARG(1) << 32);
	245	if (use_gdb_syscalls()) {
	246	m68k_semi_is_fseek = 1;
	247	gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
	248	ARG(0), off, ARG(3));
	249	} else {
	250	off = lseek(ARG(0), off, ARG(3));
2f619698 FB	251	/* FIXME - handle put_user() failure */
	252	put_user_u32(off >> 32, args);
	253	put_user_u32(off, args + 4);
	254	put_user_u32(errno, args + 8);
a87295e8 PB	255	}
	256	return;
	257	}
	258	case HOSTED_RENAME:
	259	if (use_gdb_syscalls()) {
5fafdf24	260	gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
a87295e8 PB	261	ARG(0), (int)ARG(1), ARG(2), (int)ARG(3));
	262	return;
	263	} else {
	264	p = lock_user_string(ARG(0));
	265	q = lock_user_string(ARG(2));
579a97f7 FB	266	if (!p \|\| !q) {
	267	/* FIXME - check error code? */
	268	result = -1;
	269	} else {
	270	result = rename(p, q);
	271	}
a87295e8 PB	272	unlock_user(p, ARG(0), 0);
	273	unlock_user(q, ARG(2), 0);
	274	}
	275	break;
	276	case HOSTED_UNLINK:
	277	if (use_gdb_syscalls()) {
	278	gdb_do_syscall(m68k_semi_cb, "unlink,%s",
	279	ARG(0), (int)ARG(1));
	280	return;
	281	} else {
579a97f7 FB	282	if (!(p = lock_user_string(ARG(0)))) {
	283	/* FIXME - check error code? */
	284	result = -1;
	285	} else {
	286	result = unlink(p);
	287	unlock_user(p, ARG(0), 0);
	288	}
a87295e8 PB	289	}
	290	break;
	291	case HOSTED_STAT:
	292	if (use_gdb_syscalls()) {
	293	gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
	294	ARG(0), (int)ARG(1), ARG(2));
	295	return;
	296	} else {
	297	struct stat s;
579a97f7 FB	298	if (!(p = lock_user_string(ARG(0)))) {
	299	/* FIXME - check error code? */
	300	result = -1;
	301	} else {
	302	result = stat(p, &s);
	303	unlock_user(p, ARG(0), 0);
	304	}
a87295e8 PB	305	if (result == 0) {
	306	translate_stat(env, ARG(2), &s);
	307	}
	308	}
	309	break;
	310	case HOSTED_FSTAT:
	311	if (use_gdb_syscalls()) {
	312	gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
	313	ARG(0), ARG(1));
	314	return;
	315	} else {
	316	struct stat s;
	317	result = fstat(ARG(0), &s);
	318	if (result == 0) {
	319	translate_stat(env, ARG(1), &s);
	320	}
	321	}
	322	break;
	323	case HOSTED_GETTIMEOFDAY:
	324	if (use_gdb_syscalls()) {
	325	gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
	326	ARG(0), ARG(1));
	327	return;
	328	} else {
29b3a662	329	qemu_timeval tv;
a87295e8	330	struct gdb_timeval *p;
29b3a662	331	result = qemu_gettimeofday(&tv);
a87295e8	332	if (result != 0) {
579a97f7 FB	333	if (!(p = lock_user(VERIFY_WRITE,
	334	ARG(0), sizeof(struct gdb_timeval), 0))) {
	335	/* FIXME - check error code? */
	336	result = -1;
	337	} else {
	338	p->tv_sec = cpu_to_be32(tv.tv_sec);
	339	p->tv_usec = cpu_to_be64(tv.tv_usec);
	340	unlock_user(p, ARG(0), sizeof(struct gdb_timeval));
	341	}
a87295e8 PB	342	}
	343	}
	344	break;
	345	case HOSTED_ISATTY:
	346	if (use_gdb_syscalls()) {
	347	gdb_do_syscall(m68k_semi_cb, "isatty,%x", ARG(0));
	348	return;
	349	} else {
	350	result = isatty(ARG(0));
	351	}
	352	break;
	353	case HOSTED_SYSTEM:
	354	if (use_gdb_syscalls()) {
	355	gdb_do_syscall(m68k_semi_cb, "system,%s",
	356	ARG(0), (int)ARG(1));
	357	return;
	358	} else {
579a97f7 FB	359	if (!(p = lock_user_string(ARG(0)))) {
	360	/* FIXME - check error code? */
	361	result = -1;
	362	} else {
	363	result = system(p);
	364	unlock_user(p, ARG(0), 0);
	365	}
a87295e8 PB	366	}
	367	break;
	368	case HOSTED_INIT_SIM:
	369	#if defined(CONFIG_USER_ONLY)
	370	{
	371	TaskState *ts = env->opaque;
	372	/* Allocate the heap using sbrk. */
	373	if (!ts->heap_limit) {
	374	long ret;
	375	uint32_t size;
	376	uint32_t base;
	377
	378	base = do_brk(0);
	379	size = SEMIHOSTING_HEAP_SIZE;
	380	/* Try a big heap, and reduce the size if that fails. */
	381	for (;;) {
	382	ret = do_brk(base + size);
	383	if (ret != -1)
	384	break;
	385	size >>= 1;
	386	}
	387	ts->heap_limit = base + size;
	388	}
	389	/* This call may happen before we have writable memory, so return
	390	values directly in registers. */
	391	env->dregs[1] = ts->heap_limit;
	392	env->aregs[7] = ts->stack_base;
	393	}
	394	#else
	395	/* FIXME: This is wrong for boards where RAM does not start at
	396	address zero. */
	397	env->dregs[1] = ram_size;
	398	env->aregs[7] = ram_size;
	399	#endif
	400	return;
	401	default:
	402	cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);
	403	result = 0;
	404	}
2f619698 FB	405	/* FIXME - handle put_user() failure */
	406	put_user_u32(result, args);
	407	put_user_u32(errno, args + 4);
a87295e8	408	}