[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, see <http://www.gnu.org/licenses/>.
 */

#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
8167ee88	17	* along with this program; if not, see <http://www.gnu.org/licenses/>.
a87295e8 PB	18	*/
	19
	20	#include <sys/types.h>
	21	#include <sys/stat.h>
	22	#include <errno.h>
	23	#include <fcntl.h>
	24	#include <unistd.h>
	25	#include <stdlib.h>
	26	#include <stdio.h>
	27	#include <sys/time.h>
	28	#include <time.h>
	29
	30	#include "cpu.h"
	31	#if defined(CONFIG_USER_ONLY)
	32	#include "qemu.h"
	33	#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
	34	#else
87ecb68b PB	35	#include "qemu-common.h"
	36	#include "sysemu.h"
	37	#include "gdbstub.h"
a87295e8 PB	38	#include "softmmu-semi.h"
	39	#endif
	40
	41	#define HOSTED_EXIT 0
	42	#define HOSTED_INIT_SIM 1
	43	#define HOSTED_OPEN 2
	44	#define HOSTED_CLOSE 3
	45	#define HOSTED_READ 4
	46	#define HOSTED_WRITE 5
	47	#define HOSTED_LSEEK 6
	48	#define HOSTED_RENAME 7
	49	#define HOSTED_UNLINK 8
	50	#define HOSTED_STAT 9
	51	#define HOSTED_FSTAT 10
	52	#define HOSTED_GETTIMEOFDAY 11
	53	#define HOSTED_ISATTY 12
	54	#define HOSTED_SYSTEM 13
	55
c227f099 AL	56	typedef uint32_t gdb_mode_t;
c227f099 AL	57	typedef uint32_t gdb_time_t;
a87295e8 PB	58
	59	struct m68k_gdb_stat {
	60	uint32_t gdb_st_dev; /* device */
	61	uint32_t gdb_st_ino; /* inode */
c227f099	62	gdb_mode_t gdb_st_mode; /* protection */
a87295e8 PB	63	uint32_t gdb_st_nlink; /* number of hard links */
	64	uint32_t gdb_st_uid; /* user ID of owner */
	65	uint32_t gdb_st_gid; /* group ID of owner */
	66	uint32_t gdb_st_rdev; /* device type (if inode device) */
	67	uint64_t gdb_st_size; /* total size, in bytes */
	68	uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
	69	uint64_t gdb_st_blocks; /* number of blocks allocated */
c227f099 AL	70	gdb_time_t gdb_st_atime; /* time of last access */
	71	gdb_time_t gdb_st_mtime; /* time of last modification */
	72	gdb_time_t gdb_st_ctime; /* time of last change */
a87295e8 PB	73	} __attribute__((packed));
	74
	75	struct gdb_timeval {
c227f099	76	gdb_time_t tv_sec; /* second */
a87295e8 PB	77	uint64_t tv_usec; /* microsecond */
	78	} __attribute__((packed));
	79
	80	#define GDB_O_RDONLY 0x0
	81	#define GDB_O_WRONLY 0x1
	82	#define GDB_O_RDWR 0x2
	83	#define GDB_O_APPEND 0x8
	84	#define GDB_O_CREAT 0x200
	85	#define GDB_O_TRUNC 0x400
	86	#define GDB_O_EXCL 0x800
	87
	88	static int translate_openflags(int flags)
	89	{
	90	int hf;
	91
	92	if (flags & GDB_O_WRONLY)
	93	hf = O_WRONLY;
	94	else if (flags & GDB_O_RDWR)
	95	hf = O_RDWR;
	96	else
	97	hf = O_RDONLY;
	98
	99	if (flags & GDB_O_APPEND) hf \|= O_APPEND;
	100	if (flags & GDB_O_CREAT) hf \|= O_CREAT;
	101	if (flags & GDB_O_TRUNC) hf \|= O_TRUNC;
	102	if (flags & GDB_O_EXCL) hf \|= O_EXCL;
	103
	104	return hf;
	105	}
	106
	107	static void translate_stat(CPUState env, target_ulong addr, struct stat s)
	108	{
	109	struct m68k_gdb_stat *p;
	110
579a97f7 FB	111	if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
	112	/* FIXME - should this return an error code? */
	113	return;
a87295e8 PB	114	p->gdb_st_dev = cpu_to_be32(s->st_dev);
	115	p->gdb_st_ino = cpu_to_be32(s->st_ino);
	116	p->gdb_st_mode = cpu_to_be32(s->st_mode);
	117	p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
	118	p->gdb_st_uid = cpu_to_be32(s->st_uid);
	119	p->gdb_st_gid = cpu_to_be32(s->st_gid);
	120	p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
	121	p->gdb_st_size = cpu_to_be64(s->st_size);
29b3a662 PB	122	#ifdef _WIN32
	123	/* Windows stat is missing some fields. */
	124	p->gdb_st_blksize = 0;
	125	p->gdb_st_blocks = 0;
	126	#else
a87295e8 PB	127	p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
a87295e8 PB	128	p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
29b3a662	129	#endif
a87295e8 PB	130	p->gdb_st_atime = cpu_to_be32(s->st_atime);
	131	p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
	132	p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
	133	unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
	134	}
	135
	136	static int m68k_semi_is_fseek;
	137
	138	static void m68k_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
	139	{
	140	target_ulong args;
	141
	142	args = env->dregs[1];
	143	if (m68k_semi_is_fseek) {
	144	/* FIXME: We've already lost the high bits of the fseek
	145	return value. */
2f619698 FB	146	/* FIXME - handle put_user() failure */
2f619698 FB	147	put_user_u32(0, args);
a87295e8 PB	148	args += 4;
	149	m68k_semi_is_fseek = 0;
	150	}
2f619698 FB	151	/* FIXME - handle put_user() failure */
	152	put_user_u32(ret, args);
	153	put_user_u32(errno, args + 4);
a87295e8 PB	154	}
a87295e8 PB	155
2f619698 FB	156	#define ARG(n) \
	157	({ \
	158	target_ulong __arg; \
	159	/* FIXME - handle get_user() failure */ \
	160	get_user_ual(__arg, args + (n) * 4); \
	161	__arg; \
	162	})
a87295e8 PB	163	#define PARG(x) ((unsigned long)ARG(x))
	164	void do_m68k_semihosting(CPUM68KState *env, int nr)
	165	{
	166	uint32_t args;
	167	void *p;
	168	void *q;
	169	uint32_t len;
	170	uint32_t result;
	171
	172	args = env->dregs[1];
	173	switch (nr) {
	174	case HOSTED_EXIT:
	175	exit(env->dregs[0]);
	176	case HOSTED_OPEN:
	177	if (use_gdb_syscalls()) {
	178	gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", ARG(0), (int)ARG(1),
	179	ARG(2), ARG(3));
	180	return;
	181	} else {
579a97f7 FB	182	if (!(p = lock_user_string(ARG(0)))) {
	183	/* FIXME - check error code? */
	184	result = -1;
	185	} else {
	186	result = open(p, translate_openflags(ARG(2)), ARG(3));
	187	unlock_user(p, ARG(0), 0);
	188	}
a87295e8 PB	189	}
	190	break;
	191	case HOSTED_CLOSE:
	192	{
	193	/* Ignore attempts to close stdin/out/err. */
	194	int fd = ARG(0);
	195	if (fd > 2) {
	196	if (use_gdb_syscalls()) {
	197	gdb_do_syscall(m68k_semi_cb, "close,%x", ARG(0));
	198	return;
	199	} else {
	200	result = close(fd);
	201	}
	202	} else {
	203	result = 0;
	204	}
	205	break;
	206	}
	207	case HOSTED_READ:
	208	len = ARG(2);
	209	if (use_gdb_syscalls()) {
	210	gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
	211	ARG(0), ARG(1), len);
	212	return;
	213	} else {
579a97f7 FB	214	if (!(p = lock_user(VERIFY_WRITE, ARG(1), len, 0))) {
	215	/* FIXME - check error code? */
	216	result = -1;
	217	} else {
	218	result = read(ARG(0), p, len);
	219	unlock_user(p, ARG(1), len);
	220	}
a87295e8 PB	221	}
	222	break;
	223	case HOSTED_WRITE:
	224	len = ARG(2);
	225	if (use_gdb_syscalls()) {
	226	gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
	227	ARG(0), ARG(1), len);
	228	return;
	229	} else {
579a97f7 FB	230	if (!(p = lock_user(VERIFY_READ, ARG(1), len, 1))) {
	231	/* FIXME - check error code? */
	232	result = -1;
	233	} else {
	234	result = write(ARG(0), p, len);
	235	unlock_user(p, ARG(0), 0);
	236	}
a87295e8 PB	237	}
	238	break;
	239	case HOSTED_LSEEK:
	240	{
	241	uint64_t off;
	242	off = (uint32_t)ARG(2) \| ((uint64_t)ARG(1) << 32);
	243	if (use_gdb_syscalls()) {
	244	m68k_semi_is_fseek = 1;
	245	gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
	246	ARG(0), off, ARG(3));
	247	} else {
	248	off = lseek(ARG(0), off, ARG(3));
2f619698 FB	249	/* FIXME - handle put_user() failure */
	250	put_user_u32(off >> 32, args);
	251	put_user_u32(off, args + 4);
	252	put_user_u32(errno, args + 8);
a87295e8 PB	253	}
	254	return;
	255	}
	256	case HOSTED_RENAME:
	257	if (use_gdb_syscalls()) {
5fafdf24	258	gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
a87295e8 PB	259	ARG(0), (int)ARG(1), ARG(2), (int)ARG(3));
	260	return;
	261	} else {
	262	p = lock_user_string(ARG(0));
	263	q = lock_user_string(ARG(2));
579a97f7 FB	264	if (!p \|\| !q) {
	265	/* FIXME - check error code? */
	266	result = -1;
	267	} else {
	268	result = rename(p, q);
	269	}
a87295e8 PB	270	unlock_user(p, ARG(0), 0);
	271	unlock_user(q, ARG(2), 0);
	272	}
	273	break;
	274	case HOSTED_UNLINK:
	275	if (use_gdb_syscalls()) {
	276	gdb_do_syscall(m68k_semi_cb, "unlink,%s",
	277	ARG(0), (int)ARG(1));
	278	return;
	279	} else {
579a97f7 FB	280	if (!(p = lock_user_string(ARG(0)))) {
	281	/* FIXME - check error code? */
	282	result = -1;
	283	} else {
	284	result = unlink(p);
	285	unlock_user(p, ARG(0), 0);
	286	}
a87295e8 PB	287	}
	288	break;
	289	case HOSTED_STAT:
	290	if (use_gdb_syscalls()) {
	291	gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
	292	ARG(0), (int)ARG(1), ARG(2));
	293	return;
	294	} else {
	295	struct stat s;
579a97f7 FB	296	if (!(p = lock_user_string(ARG(0)))) {
	297	/* FIXME - check error code? */
	298	result = -1;
	299	} else {
	300	result = stat(p, &s);
	301	unlock_user(p, ARG(0), 0);
	302	}
a87295e8 PB	303	if (result == 0) {
	304	translate_stat(env, ARG(2), &s);
	305	}
	306	}
	307	break;
	308	case HOSTED_FSTAT:
	309	if (use_gdb_syscalls()) {
	310	gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
	311	ARG(0), ARG(1));
	312	return;
	313	} else {
	314	struct stat s;
	315	result = fstat(ARG(0), &s);
	316	if (result == 0) {
	317	translate_stat(env, ARG(1), &s);
	318	}
	319	}
	320	break;
	321	case HOSTED_GETTIMEOFDAY:
	322	if (use_gdb_syscalls()) {
	323	gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
	324	ARG(0), ARG(1));
	325	return;
	326	} else {
29b3a662	327	qemu_timeval tv;
a87295e8	328	struct gdb_timeval *p;
29b3a662	329	result = qemu_gettimeofday(&tv);
a87295e8	330	if (result != 0) {
579a97f7 FB	331	if (!(p = lock_user(VERIFY_WRITE,
	332	ARG(0), sizeof(struct gdb_timeval), 0))) {
	333	/* FIXME - check error code? */
	334	result = -1;
	335	} else {
	336	p->tv_sec = cpu_to_be32(tv.tv_sec);
	337	p->tv_usec = cpu_to_be64(tv.tv_usec);
	338	unlock_user(p, ARG(0), sizeof(struct gdb_timeval));
	339	}
a87295e8 PB	340	}
	341	}
	342	break;
	343	case HOSTED_ISATTY:
	344	if (use_gdb_syscalls()) {
	345	gdb_do_syscall(m68k_semi_cb, "isatty,%x", ARG(0));
	346	return;
	347	} else {
	348	result = isatty(ARG(0));
	349	}
	350	break;
	351	case HOSTED_SYSTEM:
	352	if (use_gdb_syscalls()) {
	353	gdb_do_syscall(m68k_semi_cb, "system,%s",
	354	ARG(0), (int)ARG(1));
	355	return;
	356	} else {
579a97f7 FB	357	if (!(p = lock_user_string(ARG(0)))) {
	358	/* FIXME - check error code? */
	359	result = -1;
	360	} else {
	361	result = system(p);
	362	unlock_user(p, ARG(0), 0);
	363	}
a87295e8 PB	364	}
	365	break;
	366	case HOSTED_INIT_SIM:
	367	#if defined(CONFIG_USER_ONLY)
	368	{
	369	TaskState *ts = env->opaque;
	370	/* Allocate the heap using sbrk. */
	371	if (!ts->heap_limit) {
	372	long ret;
	373	uint32_t size;
	374	uint32_t base;
	375
	376	base = do_brk(0);
	377	size = SEMIHOSTING_HEAP_SIZE;
	378	/* Try a big heap, and reduce the size if that fails. */
	379	for (;;) {
	380	ret = do_brk(base + size);
	381	if (ret != -1)
	382	break;
	383	size >>= 1;
	384	}
	385	ts->heap_limit = base + size;
	386	}
	387	/* This call may happen before we have writable memory, so return
	388	values directly in registers. */
	389	env->dregs[1] = ts->heap_limit;
	390	env->aregs[7] = ts->stack_base;
	391	}
	392	#else
	393	/* FIXME: This is wrong for boards where RAM does not start at
	394	address zero. */
	395	env->dregs[1] = ram_size;
	396	env->aregs[7] = ram_size;
	397	#endif
	398	return;
	399	default:
	400	cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);
	401	result = 0;
	402	}
2f619698 FB	403	/* FIXME - handle put_user() failure */
	404	put_user_u32(result, args);
	405	put_user_u32(errno, args + 4);
a87295e8	406	}