[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., 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 "cpu.h"
#if defined(CONFIG_USER_ONLY)
#include "qemu.h"
#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "vl.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.  */
        tput32(args, 0);
        args += 4;
        m68k_semi_is_fseek = 0;
    }
    tput32(args, ret);
    tput32(args + 4, errno);
}

#define ARG(x) tget32(args + (x) * 4)
#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));
                tput32(args, off >> 32);
                tput32(args + 4, off);
                tput32(args + 8, errno);
            }
            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;
    }
    tput32(args, result);
    tput32(args + 4, errno);
}
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
	18	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	19	*/
	20
	21	#include <sys/types.h>
	22	#include <sys/stat.h>
	23	#include <errno.h>
	24	#include <fcntl.h>
	25	#include <unistd.h>
	26	#include <stdlib.h>
	27	#include <stdio.h>
	28	#include <sys/time.h>
	29	#include <time.h>
	30
	31	#include "cpu.h"
	32	#if defined(CONFIG_USER_ONLY)
	33	#include "qemu.h"
	34	#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
	35	#else
	36	#include "vl.h"
	37	#include "softmmu-semi.h"
	38	#endif
	39
	40	#define HOSTED_EXIT 0
	41	#define HOSTED_INIT_SIM 1
	42	#define HOSTED_OPEN 2
	43	#define HOSTED_CLOSE 3
	44	#define HOSTED_READ 4
	45	#define HOSTED_WRITE 5
	46	#define HOSTED_LSEEK 6
	47	#define HOSTED_RENAME 7
	48	#define HOSTED_UNLINK 8
	49	#define HOSTED_STAT 9
	50	#define HOSTED_FSTAT 10
	51	#define HOSTED_GETTIMEOFDAY 11
	52	#define HOSTED_ISATTY 12
	53	#define HOSTED_SYSTEM 13
	54
	55	typedef uint32_t gdb_mode_t;
	56	typedef uint32_t gdb_time_t;
	57
	58	struct m68k_gdb_stat {
	59	uint32_t gdb_st_dev; /* device */
	60	uint32_t gdb_st_ino; /* inode */
	61	gdb_mode_t gdb_st_mode; /* protection */
	62	uint32_t gdb_st_nlink; /* number of hard links */
	63	uint32_t gdb_st_uid; /* user ID of owner */
	64	uint32_t gdb_st_gid; /* group ID of owner */
	65	uint32_t gdb_st_rdev; /* device type (if inode device) */
	66	uint64_t gdb_st_size; /* total size, in bytes */
	67	uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
68	uint64_t gdb_st_blocks; /* number of blocks allocated */
69	gdb_time_t gdb_st_atime; /* time of last access */
70	gdb_time_t gdb_st_mtime; /* time of last modification */
71	gdb_time_t gdb_st_ctime; /* time of last change */
72	} __attribute__((packed));
73
74	struct gdb_timeval {
75	gdb_time_t tv_sec; /* second */
76	uint64_t tv_usec; /* microsecond */
77	} __attribute__((packed));
78
79	#define GDB_O_RDONLY 0x0
80	#define GDB_O_WRONLY 0x1
81	#define GDB_O_RDWR 0x2
82	#define GDB_O_APPEND 0x8
83	#define GDB_O_CREAT 0x200
84	#define GDB_O_TRUNC 0x400
85	#define GDB_O_EXCL 0x800
86
87	static int translate_openflags(int flags)
88	{
89	int hf;
90
91	if (flags & GDB_O_WRONLY)
92	hf = O_WRONLY;
93	else if (flags & GDB_O_RDWR)
94	hf = O_RDWR;
95	else
96	hf = O_RDONLY;
97
98	if (flags & GDB_O_APPEND) hf \|= O_APPEND;
99	if (flags & GDB_O_CREAT) hf \|= O_CREAT;
100	if (flags & GDB_O_TRUNC) hf \|= O_TRUNC;
101	if (flags & GDB_O_EXCL) hf \|= O_EXCL;
102
103	return hf;
104	}
105
106	static void translate_stat(CPUState env, target_ulong addr, struct stat s)
107	{
108	struct m68k_gdb_stat *p;
109
579a97f7 FB	110	if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
	111	/* FIXME - should this return an error code? */
	112	return;
a87295e8 PB	113	p->gdb_st_dev = cpu_to_be32(s->st_dev);
	114	p->gdb_st_ino = cpu_to_be32(s->st_ino);
	115	p->gdb_st_mode = cpu_to_be32(s->st_mode);
	116	p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
	117	p->gdb_st_uid = cpu_to_be32(s->st_uid);
	118	p->gdb_st_gid = cpu_to_be32(s->st_gid);
	119	p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
	120	p->gdb_st_size = cpu_to_be64(s->st_size);
29b3a662 PB	121	#ifdef _WIN32
	122	/* Windows stat is missing some fields. */
	123	p->gdb_st_blksize = 0;
	124	p->gdb_st_blocks = 0;
	125	#else
a87295e8 PB	126	p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
a87295e8 PB	127	p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
29b3a662	128	#endif
a87295e8 PB	129	p->gdb_st_atime = cpu_to_be32(s->st_atime);
	130	p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
	131	p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
	132	unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
	133	}
	134
	135	static int m68k_semi_is_fseek;
	136
	137	static void m68k_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
	138	{
	139	target_ulong args;
	140
	141	args = env->dregs[1];
	142	if (m68k_semi_is_fseek) {
	143	/* FIXME: We've already lost the high bits of the fseek
	144	return value. */
	145	tput32(args, 0);
	146	args += 4;
	147	m68k_semi_is_fseek = 0;
	148	}
	149	tput32(args, ret);
	150	tput32(args + 4, errno);
	151	}
	152
	153	#define ARG(x) tget32(args + (x) * 4)
	154	#define PARG(x) ((unsigned long)ARG(x))
	155	void do_m68k_semihosting(CPUM68KState *env, int nr)
	156	{
	157	uint32_t args;
	158	void *p;
	159	void *q;
	160	uint32_t len;
	161	uint32_t result;
	162
	163	args = env->dregs[1];
	164	switch (nr) {
	165	case HOSTED_EXIT:
	166	exit(env->dregs[0]);
	167	case HOSTED_OPEN:
	168	if (use_gdb_syscalls()) {
	169	gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", ARG(0), (int)ARG(1),
	170	ARG(2), ARG(3));
	171	return;
	172	} else {
579a97f7 FB	173	if (!(p = lock_user_string(ARG(0)))) {
	174	/* FIXME - check error code? */
	175	result = -1;
	176	} else {
	177	result = open(p, translate_openflags(ARG(2)), ARG(3));
	178	unlock_user(p, ARG(0), 0);
	179	}
a87295e8 PB	180	}
	181	break;
	182	case HOSTED_CLOSE:
	183	{
	184	/* Ignore attempts to close stdin/out/err. */
	185	int fd = ARG(0);
	186	if (fd > 2) {
	187	if (use_gdb_syscalls()) {
	188	gdb_do_syscall(m68k_semi_cb, "close,%x", ARG(0));
	189	return;
	190	} else {
	191	result = close(fd);
	192	}
	193	} else {
	194	result = 0;
	195	}
	196	break;
	197	}
	198	case HOSTED_READ:
	199	len = ARG(2);
	200	if (use_gdb_syscalls()) {
	201	gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
	202	ARG(0), ARG(1), len);
	203	return;
	204	} else {
579a97f7 FB	205	if (!(p = lock_user(VERIFY_WRITE, ARG(1), len, 0))) {
	206	/* FIXME - check error code? */
	207	result = -1;
	208	} else {
	209	result = read(ARG(0), p, len);
	210	unlock_user(p, ARG(1), len);
	211	}
a87295e8 PB	212	}
	213	break;
	214	case HOSTED_WRITE:
	215	len = ARG(2);
	216	if (use_gdb_syscalls()) {
	217	gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
	218	ARG(0), ARG(1), len);
	219	return;
	220	} else {
579a97f7 FB	221	if (!(p = lock_user(VERIFY_READ, ARG(1), len, 1))) {
	222	/* FIXME - check error code? */
	223	result = -1;
	224	} else {
	225	result = write(ARG(0), p, len);
	226	unlock_user(p, ARG(0), 0);
	227	}
a87295e8 PB	228	}
	229	break;
	230	case HOSTED_LSEEK:
	231	{
	232	uint64_t off;
	233	off = (uint32_t)ARG(2) \| ((uint64_t)ARG(1) << 32);
	234	if (use_gdb_syscalls()) {
	235	m68k_semi_is_fseek = 1;
	236	gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
	237	ARG(0), off, ARG(3));
	238	} else {
	239	off = lseek(ARG(0), off, ARG(3));
	240	tput32(args, off >> 32);
	241	tput32(args + 4, off);
	242	tput32(args + 8, errno);
	243	}
	244	return;
	245	}
	246	case HOSTED_RENAME:
	247	if (use_gdb_syscalls()) {
5fafdf24	248	gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
a87295e8 PB	249	ARG(0), (int)ARG(1), ARG(2), (int)ARG(3));
	250	return;
	251	} else {
	252	p = lock_user_string(ARG(0));
	253	q = lock_user_string(ARG(2));
579a97f7 FB	254	if (!p \|\| !q) {
	255	/* FIXME - check error code? */
	256	result = -1;
	257	} else {
	258	result = rename(p, q);
	259	}
a87295e8 PB	260	unlock_user(p, ARG(0), 0);
	261	unlock_user(q, ARG(2), 0);
	262	}
	263	break;
	264	case HOSTED_UNLINK:
	265	if (use_gdb_syscalls()) {
	266	gdb_do_syscall(m68k_semi_cb, "unlink,%s",
	267	ARG(0), (int)ARG(1));
	268	return;
	269	} else {
579a97f7 FB	270	if (!(p = lock_user_string(ARG(0)))) {
	271	/* FIXME - check error code? */
	272	result = -1;
	273	} else {
	274	result = unlink(p);
	275	unlock_user(p, ARG(0), 0);
	276	}
a87295e8 PB	277	}
	278	break;
	279	case HOSTED_STAT:
	280	if (use_gdb_syscalls()) {
	281	gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
	282	ARG(0), (int)ARG(1), ARG(2));
	283	return;
	284	} else {
	285	struct stat s;
579a97f7 FB	286	if (!(p = lock_user_string(ARG(0)))) {
	287	/* FIXME - check error code? */
	288	result = -1;
	289	} else {
	290	result = stat(p, &s);
	291	unlock_user(p, ARG(0), 0);
	292	}
a87295e8 PB	293	if (result == 0) {
	294	translate_stat(env, ARG(2), &s);
	295	}
	296	}
	297	break;
	298	case HOSTED_FSTAT:
	299	if (use_gdb_syscalls()) {
	300	gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
	301	ARG(0), ARG(1));
	302	return;
	303	} else {
	304	struct stat s;
	305	result = fstat(ARG(0), &s);
	306	if (result == 0) {
	307	translate_stat(env, ARG(1), &s);
	308	}
	309	}
	310	break;
	311	case HOSTED_GETTIMEOFDAY:
	312	if (use_gdb_syscalls()) {
	313	gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
	314	ARG(0), ARG(1));
	315	return;
	316	} else {
29b3a662	317	qemu_timeval tv;
a87295e8	318	struct gdb_timeval *p;
29b3a662	319	result = qemu_gettimeofday(&tv);
a87295e8	320	if (result != 0) {
579a97f7 FB	321	if (!(p = lock_user(VERIFY_WRITE,
	322	ARG(0), sizeof(struct gdb_timeval), 0))) {
	323	/* FIXME - check error code? */
	324	result = -1;
	325	} else {
	326	p->tv_sec = cpu_to_be32(tv.tv_sec);
	327	p->tv_usec = cpu_to_be64(tv.tv_usec);
	328	unlock_user(p, ARG(0), sizeof(struct gdb_timeval));
	329	}
a87295e8 PB	330	}
	331	}
	332	break;
	333	case HOSTED_ISATTY:
	334	if (use_gdb_syscalls()) {
	335	gdb_do_syscall(m68k_semi_cb, "isatty,%x", ARG(0));
	336	return;
	337	} else {
	338	result = isatty(ARG(0));
	339	}
	340	break;
	341	case HOSTED_SYSTEM:
	342	if (use_gdb_syscalls()) {
	343	gdb_do_syscall(m68k_semi_cb, "system,%s",
	344	ARG(0), (int)ARG(1));
	345	return;
	346	} else {
579a97f7 FB	347	if (!(p = lock_user_string(ARG(0)))) {
	348	/* FIXME - check error code? */
	349	result = -1;
	350	} else {
	351	result = system(p);
	352	unlock_user(p, ARG(0), 0);
	353	}
a87295e8 PB	354	}
	355	break;
	356	case HOSTED_INIT_SIM:
	357	#if defined(CONFIG_USER_ONLY)
	358	{
	359	TaskState *ts = env->opaque;
	360	/* Allocate the heap using sbrk. */
	361	if (!ts->heap_limit) {
	362	long ret;
	363	uint32_t size;
	364	uint32_t base;
	365
	366	base = do_brk(0);
	367	size = SEMIHOSTING_HEAP_SIZE;
	368	/* Try a big heap, and reduce the size if that fails. */
	369	for (;;) {
	370	ret = do_brk(base + size);
	371	if (ret != -1)
	372	break;
	373	size >>= 1;
	374	}
	375	ts->heap_limit = base + size;
	376	}
	377	/* This call may happen before we have writable memory, so return
	378	values directly in registers. */
	379	env->dregs[1] = ts->heap_limit;
	380	env->aregs[7] = ts->stack_base;
	381	}
	382	#else
	383	/* FIXME: This is wrong for boards where RAM does not start at
	384	address zero. */
	385	env->dregs[1] = ram_size;
	386	env->aregs[7] = ram_size;
	387	#endif
	388	return;
	389	default:
	390	cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);
	391	result = 0;
	392	}
	393	tput32(args, result);
	394	tput32(args + 4, errno);
	395	}