[mirror_qemu.git] / target-m68k / 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 "qemu/osdep.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 "exec/gdbstub.h"
#include "exec/softmmu-semi.h"
#endif
#include "sysemu/sysemu.h"

#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 */
} QEMU_PACKED;

struct gdb_timeval {
  gdb_time_t tv_sec;  /* second */
  uint64_t tv_usec;   /* microsecond */
} QEMU_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(CPUM68KState *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 void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
{
    target_ulong args = env->dregs[1];
    if (put_user_u32(ret, args) ||
        put_user_u32(err, args + 4)) {
        /* The m68k semihosting ABI does not provide any way to report this
         * error to the guest, so the best we can do is log it in qemu.
         * It is always a guest error not to pass us a valid argument block.
         */
        qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
                      "discarded because argument block not writable\n");
    }
}

static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err)
{
    target_ulong args = env->dregs[1];
    if (put_user_u32(ret >> 32, args) ||
        put_user_u32(ret, args + 4) ||
        put_user_u32(err, args + 8)) {
        /* No way to report this via m68k semihosting ABI; just log it */
        qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
                      "discarded because argument block not writable\n");
    }
}

static int m68k_semi_is_fseek;

static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
    M68kCPU *cpu = M68K_CPU(cs);
    CPUM68KState *env = &cpu->env;

    if (m68k_semi_is_fseek) {
        /* FIXME: We've already lost the high bits of the fseek
           return value.  */
        m68k_semi_return_u64(env, ret, err);
        m68k_semi_is_fseek = 0;
    } else {
        m68k_semi_return_u32(env, ret, err);
    }
}

/* Read the input value from the argument block; fail the semihosting
 * call if the memory read fails.
 */
#define GET_ARG(n) do {                                 \
    if (get_user_ual(arg ## n, args + (n) * 4)) {       \
        result = -1;                                    \
        errno = EFAULT;                                 \
        goto failed;                                    \
    }                                                   \
} while (0)

void do_m68k_semihosting(CPUM68KState *env, int nr)
{
    uint32_t args;
    target_ulong arg0, arg1, arg2, arg3;
    void *p;
    void *q;
    uint32_t len;
    uint32_t result;

    args = env->dregs[1];
    switch (nr) {
    case HOSTED_EXIT:
        gdb_exit(env, env->dregs[0]);
        exit(env->dregs[0]);
    case HOSTED_OPEN:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        GET_ARG(3);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
                           arg2, arg3);
            return;
        } else {
            p = lock_user_string(arg0);
            if (!p) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = open(p, translate_openflags(arg2), arg3);
                unlock_user(p, arg0, 0);
            }
        }
        break;
    case HOSTED_CLOSE:
        {
            /* Ignore attempts to close stdin/out/err.  */
            GET_ARG(0);
            int fd = arg0;
            if (fd > 2) {
                if (use_gdb_syscalls()) {
                    gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
                    return;
                } else {
                    result = close(fd);
                }
            } else {
                result = 0;
            }
            break;
        }
    case HOSTED_READ:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        len = arg2;
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
                           arg0, arg1, len);
            return;
        } else {
            p = lock_user(VERIFY_WRITE, arg1, len, 0);
            if (!p) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = read(arg0, p, len);
                unlock_user(p, arg1, len);
            }
        }
        break;
    case HOSTED_WRITE:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        len = arg2;
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
                           arg0, arg1, len);
            return;
        } else {
            p = lock_user(VERIFY_READ, arg1, len, 1);
            if (!p) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = write(arg0, p, len);
                unlock_user(p, arg0, 0);
            }
        }
        break;
    case HOSTED_LSEEK:
        {
            uint64_t off;
            GET_ARG(0);
            GET_ARG(1);
            GET_ARG(2);
            GET_ARG(3);
            off = (uint32_t)arg2 | ((uint64_t)arg1 << 32);
            if (use_gdb_syscalls()) {
                m68k_semi_is_fseek = 1;
                gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
                               arg0, off, arg3);
            } else {
                off = lseek(arg0, off, arg3);
                m68k_semi_return_u64(env, off, errno);
            }
            return;
        }
    case HOSTED_RENAME:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        GET_ARG(3);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
                           arg0, (int)arg1, arg2, (int)arg3);
            return;
        } else {
            p = lock_user_string(arg0);
            q = lock_user_string(arg2);
            if (!p || !q) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = rename(p, q);
            }
            unlock_user(p, arg0, 0);
            unlock_user(q, arg2, 0);
        }
        break;
    case HOSTED_UNLINK:
        GET_ARG(0);
        GET_ARG(1);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "unlink,%s",
                           arg0, (int)arg1);
            return;
        } else {
            p = lock_user_string(arg0);
            if (!p) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = unlink(p);
                unlock_user(p, arg0, 0);
            }
        }
        break;
    case HOSTED_STAT:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
                           arg0, (int)arg1, arg2);
            return;
        } else {
            struct stat s;
            p = lock_user_string(arg0);
            if (!p) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = stat(p, &s);
                unlock_user(p, arg0, 0);
            }
            if (result == 0) {
                translate_stat(env, arg2, &s);
            }
        }
        break;
    case HOSTED_FSTAT:
        GET_ARG(0);
        GET_ARG(1);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
                           arg0, arg1);
            return;
        } else {
            struct stat s;
            result = fstat(arg0, &s);
            if (result == 0) {
                translate_stat(env, arg1, &s);
            }
        }
        break;
    case HOSTED_GETTIMEOFDAY:
        GET_ARG(0);
        GET_ARG(1);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
                           arg0, arg1);
            return;
        } else {
            qemu_timeval tv;
            struct gdb_timeval *p;
            result = qemu_gettimeofday(&tv);
            if (result != 0) {
                if (!(p = lock_user(VERIFY_WRITE,
                                    arg0, 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, arg0, sizeof(struct gdb_timeval));
                }
            }
        }
        break;
    case HOSTED_ISATTY:
        GET_ARG(0);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
            return;
        } else {
            result = isatty(arg0);
        }
        break;
    case HOSTED_SYSTEM:
        GET_ARG(0);
        GET_ARG(1);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(m68k_semi_cb, "system,%s",
                           arg0, (int)arg1);
            return;
        } else {
            p = lock_user_string(arg0);
            if (!p) {
                /* FIXME - check error code? */
                result = -1;
            } else {
                result = system(p);
                unlock_user(p, arg0, 0);
            }
        }
        break;
    case HOSTED_INIT_SIM:
#if defined(CONFIG_USER_ONLY)
        {
        CPUState *cs = CPU(m68k_env_get_cpu(env));
        TaskState *ts = cs->opaque;
        /* Allocate the heap using sbrk.  */
        if (!ts->heap_limit) {
            abi_ulong 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 >= (base + size)) {
                    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(CPU(m68k_env_get_cpu(env)), "Unsupported semihosting syscall %d\n", nr);
        result = 0;
    }
failed:
    m68k_semi_return_u32(env, result, 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
8167ee88	17	* along with this program; if not, see <http://www.gnu.org/licenses/>.
a87295e8 PB	18	*/
a87295e8 PB	19
d8416665	20	#include "qemu/osdep.h"
a87295e8 PB	21
	22	#include "cpu.h"
	23	#if defined(CONFIG_USER_ONLY)
	24	#include "qemu.h"
	25	#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
	26	#else
87ecb68b	27	#include "qemu-common.h"
022c62cb PB	28	#include "exec/gdbstub.h"
022c62cb PB	29	#include "exec/softmmu-semi.h"
a87295e8	30	#endif
9c17d615	31	#include "sysemu/sysemu.h"
a87295e8 PB	32
	33	#define HOSTED_EXIT 0
	34	#define HOSTED_INIT_SIM 1
	35	#define HOSTED_OPEN 2
	36	#define HOSTED_CLOSE 3
	37	#define HOSTED_READ 4
	38	#define HOSTED_WRITE 5
	39	#define HOSTED_LSEEK 6
	40	#define HOSTED_RENAME 7
	41	#define HOSTED_UNLINK 8
	42	#define HOSTED_STAT 9
	43	#define HOSTED_FSTAT 10
	44	#define HOSTED_GETTIMEOFDAY 11
	45	#define HOSTED_ISATTY 12
	46	#define HOSTED_SYSTEM 13
	47
c227f099 AL	48	typedef uint32_t gdb_mode_t;
c227f099 AL	49	typedef uint32_t gdb_time_t;
a87295e8 PB	50
	51	struct m68k_gdb_stat {
	52	uint32_t gdb_st_dev; /* device */
	53	uint32_t gdb_st_ino; /* inode */
c227f099	54	gdb_mode_t gdb_st_mode; /* protection */
a87295e8 PB	55	uint32_t gdb_st_nlink; /* number of hard links */
	56	uint32_t gdb_st_uid; /* user ID of owner */
	57	uint32_t gdb_st_gid; /* group ID of owner */
	58	uint32_t gdb_st_rdev; /* device type (if inode device) */
	59	uint64_t gdb_st_size; /* total size, in bytes */
	60	uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
	61	uint64_t gdb_st_blocks; /* number of blocks allocated */
c227f099 AL	62	gdb_time_t gdb_st_atime; /* time of last access */
	63	gdb_time_t gdb_st_mtime; /* time of last modification */
	64	gdb_time_t gdb_st_ctime; /* time of last change */
541dc0d4	65	} QEMU_PACKED;
a87295e8 PB	66
a87295e8 PB	67	struct gdb_timeval {
c227f099	68	gdb_time_t tv_sec; /* second */
a87295e8	69	uint64_t tv_usec; /* microsecond */
541dc0d4	70	} QEMU_PACKED;
a87295e8 PB	71
	72	#define GDB_O_RDONLY 0x0
	73	#define GDB_O_WRONLY 0x1
	74	#define GDB_O_RDWR 0x2
	75	#define GDB_O_APPEND 0x8
	76	#define GDB_O_CREAT 0x200
	77	#define GDB_O_TRUNC 0x400
	78	#define GDB_O_EXCL 0x800
	79
	80	static int translate_openflags(int flags)
	81	{
	82	int hf;
	83
	84	if (flags & GDB_O_WRONLY)
	85	hf = O_WRONLY;
	86	else if (flags & GDB_O_RDWR)
	87	hf = O_RDWR;
	88	else
	89	hf = O_RDONLY;
	90
	91	if (flags & GDB_O_APPEND) hf \|= O_APPEND;
	92	if (flags & GDB_O_CREAT) hf \|= O_CREAT;
	93	if (flags & GDB_O_TRUNC) hf \|= O_TRUNC;
	94	if (flags & GDB_O_EXCL) hf \|= O_EXCL;
	95
	96	return hf;
	97	}
	98
71fc85e8	99	static void translate_stat(CPUM68KState env, target_ulong addr, struct stat s)
a87295e8 PB	100	{
	101	struct m68k_gdb_stat *p;
	102
579a97f7 FB	103	if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
	104	/* FIXME - should this return an error code? */
	105	return;
a87295e8 PB	106	p->gdb_st_dev = cpu_to_be32(s->st_dev);
	107	p->gdb_st_ino = cpu_to_be32(s->st_ino);
	108	p->gdb_st_mode = cpu_to_be32(s->st_mode);
	109	p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
	110	p->gdb_st_uid = cpu_to_be32(s->st_uid);
	111	p->gdb_st_gid = cpu_to_be32(s->st_gid);
	112	p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
	113	p->gdb_st_size = cpu_to_be64(s->st_size);
29b3a662 PB	114	#ifdef _WIN32
	115	/* Windows stat is missing some fields. */
	116	p->gdb_st_blksize = 0;
	117	p->gdb_st_blocks = 0;
	118	#else
a87295e8 PB	119	p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
a87295e8 PB	120	p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
29b3a662	121	#endif
a87295e8 PB	122	p->gdb_st_atime = cpu_to_be32(s->st_atime);
	123	p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
	124	p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
	125	unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
	126	}
	127
1073bfd8 PM	128	static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
	129	{
	130	target_ulong args = env->dregs[1];
	131	if (put_user_u32(ret, args) \|\|
	132	put_user_u32(err, args + 4)) {
	133	/* The m68k semihosting ABI does not provide any way to report this
	134	* error to the guest, so the best we can do is log it in qemu.
	135	* It is always a guest error not to pass us a valid argument block.
	136	*/
	137	qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
	138	"discarded because argument block not writable\n");
	139	}
	140	}
	141
	142	static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err)
	143	{
	144	target_ulong args = env->dregs[1];
	145	if (put_user_u32(ret >> 32, args) \|\|
	146	put_user_u32(ret, args + 4) \|\|
	147	put_user_u32(err, args + 8)) {
	148	/* No way to report this via m68k semihosting ABI; just log it */
	149	qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
	150	"discarded because argument block not writable\n");
	151	}
	152	}
	153
a87295e8 PB	154	static int m68k_semi_is_fseek;
a87295e8 PB	155
9e0c5422	156	static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
a87295e8	157	{
9e0c5422 AF	158	M68kCPU *cpu = M68K_CPU(cs);
	159	CPUM68KState *env = &cpu->env;
	160
a87295e8 PB	161	if (m68k_semi_is_fseek) {
	162	/* FIXME: We've already lost the high bits of the fseek
	163	return value. */
1073bfd8	164	m68k_semi_return_u64(env, ret, err);
a87295e8	165	m68k_semi_is_fseek = 0;
1073bfd8 PM	166	} else {
1073bfd8 PM	167	m68k_semi_return_u32(env, ret, err);
a87295e8	168	}
a87295e8 PB	169	}
a87295e8 PB	170
7ba6c104 PM	171	/* Read the input value from the argument block; fail the semihosting
	172	* call if the memory read fails.
	173	*/
	174	#define GET_ARG(n) do { \
	175	if (get_user_ual(arg ## n, args + (n) * 4)) { \
	176	result = -1; \
	177	errno = EFAULT; \
	178	goto failed; \
	179	} \
	180	} while (0)
	181
a87295e8 PB	182	void do_m68k_semihosting(CPUM68KState *env, int nr)
	183	{
	184	uint32_t args;
7ba6c104	185	target_ulong arg0, arg1, arg2, arg3;
a87295e8 PB	186	void *p;
	187	void *q;
	188	uint32_t len;
	189	uint32_t result;
	190
	191	args = env->dregs[1];
	192	switch (nr) {
	193	case HOSTED_EXIT:
0e1c9c54	194	gdb_exit(env, env->dregs[0]);
a87295e8 PB	195	exit(env->dregs[0]);
a87295e8 PB	196	case HOSTED_OPEN:
7ba6c104 PM	197	GET_ARG(0);
	198	GET_ARG(1);
	199	GET_ARG(2);
	200	GET_ARG(3);
a87295e8	201	if (use_gdb_syscalls()) {
7ba6c104 PM	202	gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
7ba6c104 PM	203	arg2, arg3);
a87295e8 PB	204	return;
a87295e8 PB	205	} else {
7ba6c104 PM	206	p = lock_user_string(arg0);
7ba6c104 PM	207	if (!p) {
579a97f7 FB	208	/* FIXME - check error code? */
	209	result = -1;
	210	} else {
7ba6c104 PM	211	result = open(p, translate_openflags(arg2), arg3);
7ba6c104 PM	212	unlock_user(p, arg0, 0);
579a97f7	213	}
a87295e8 PB	214	}
	215	break;
	216	case HOSTED_CLOSE:
	217	{
	218	/* Ignore attempts to close stdin/out/err. */
7ba6c104 PM	219	GET_ARG(0);
7ba6c104 PM	220	int fd = arg0;
a87295e8 PB	221	if (fd > 2) {
a87295e8 PB	222	if (use_gdb_syscalls()) {
7ba6c104	223	gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
a87295e8 PB	224	return;
	225	} else {
	226	result = close(fd);
	227	}
	228	} else {
	229	result = 0;
	230	}
	231	break;
	232	}
	233	case HOSTED_READ:
7ba6c104 PM	234	GET_ARG(0);
	235	GET_ARG(1);
	236	GET_ARG(2);
	237	len = arg2;
a87295e8 PB	238	if (use_gdb_syscalls()) {
a87295e8 PB	239	gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
7ba6c104	240	arg0, arg1, len);
a87295e8 PB	241	return;
a87295e8 PB	242	} else {
7ba6c104 PM	243	p = lock_user(VERIFY_WRITE, arg1, len, 0);
7ba6c104 PM	244	if (!p) {
579a97f7 FB	245	/* FIXME - check error code? */
	246	result = -1;
	247	} else {
7ba6c104 PM	248	result = read(arg0, p, len);
7ba6c104 PM	249	unlock_user(p, arg1, len);
579a97f7	250	}
a87295e8 PB	251	}
	252	break;
	253	case HOSTED_WRITE:
7ba6c104 PM	254	GET_ARG(0);
	255	GET_ARG(1);
	256	GET_ARG(2);
	257	len = arg2;
a87295e8 PB	258	if (use_gdb_syscalls()) {
a87295e8 PB	259	gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
7ba6c104	260	arg0, arg1, len);
a87295e8 PB	261	return;
a87295e8 PB	262	} else {
7ba6c104 PM	263	p = lock_user(VERIFY_READ, arg1, len, 1);
7ba6c104 PM	264	if (!p) {
579a97f7 FB	265	/* FIXME - check error code? */
	266	result = -1;
	267	} else {
7ba6c104 PM	268	result = write(arg0, p, len);
7ba6c104 PM	269	unlock_user(p, arg0, 0);
579a97f7	270	}
a87295e8 PB	271	}
	272	break;
	273	case HOSTED_LSEEK:
	274	{
	275	uint64_t off;
7ba6c104 PM	276	GET_ARG(0);
	277	GET_ARG(1);
	278	GET_ARG(2);
	279	GET_ARG(3);
	280	off = (uint32_t)arg2 \| ((uint64_t)arg1 << 32);
a87295e8 PB	281	if (use_gdb_syscalls()) {
	282	m68k_semi_is_fseek = 1;
	283	gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
7ba6c104	284	arg0, off, arg3);
a87295e8	285	} else {
7ba6c104	286	off = lseek(arg0, off, arg3);
1073bfd8	287	m68k_semi_return_u64(env, off, errno);
a87295e8 PB	288	}
	289	return;
	290	}
	291	case HOSTED_RENAME:
7ba6c104 PM	292	GET_ARG(0);
	293	GET_ARG(1);
	294	GET_ARG(2);
	295	GET_ARG(3);
a87295e8	296	if (use_gdb_syscalls()) {
5fafdf24	297	gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
7ba6c104	298	arg0, (int)arg1, arg2, (int)arg3);
a87295e8 PB	299	return;
a87295e8 PB	300	} else {
7ba6c104 PM	301	p = lock_user_string(arg0);
7ba6c104 PM	302	q = lock_user_string(arg2);
579a97f7 FB	303	if (!p \|\| !q) {
	304	/* FIXME - check error code? */
	305	result = -1;
	306	} else {
	307	result = rename(p, q);
	308	}
7ba6c104 PM	309	unlock_user(p, arg0, 0);
7ba6c104 PM	310	unlock_user(q, arg2, 0);
a87295e8 PB	311	}
	312	break;
	313	case HOSTED_UNLINK:
7ba6c104 PM	314	GET_ARG(0);
7ba6c104 PM	315	GET_ARG(1);
a87295e8 PB	316	if (use_gdb_syscalls()) {
a87295e8 PB	317	gdb_do_syscall(m68k_semi_cb, "unlink,%s",
7ba6c104	318	arg0, (int)arg1);
a87295e8 PB	319	return;
a87295e8 PB	320	} else {
7ba6c104 PM	321	p = lock_user_string(arg0);
7ba6c104 PM	322	if (!p) {
579a97f7 FB	323	/* FIXME - check error code? */
	324	result = -1;
	325	} else {
	326	result = unlink(p);
7ba6c104	327	unlock_user(p, arg0, 0);
579a97f7	328	}
a87295e8 PB	329	}
	330	break;
	331	case HOSTED_STAT:
7ba6c104 PM	332	GET_ARG(0);
	333	GET_ARG(1);
	334	GET_ARG(2);
a87295e8 PB	335	if (use_gdb_syscalls()) {
a87295e8 PB	336	gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
7ba6c104	337	arg0, (int)arg1, arg2);
a87295e8 PB	338	return;
	339	} else {
	340	struct stat s;
7ba6c104 PM	341	p = lock_user_string(arg0);
7ba6c104 PM	342	if (!p) {
579a97f7 FB	343	/* FIXME - check error code? */
	344	result = -1;
	345	} else {
	346	result = stat(p, &s);
7ba6c104	347	unlock_user(p, arg0, 0);
579a97f7	348	}
a87295e8	349	if (result == 0) {
7ba6c104	350	translate_stat(env, arg2, &s);
a87295e8 PB	351	}
	352	}
	353	break;
	354	case HOSTED_FSTAT:
7ba6c104 PM	355	GET_ARG(0);
7ba6c104 PM	356	GET_ARG(1);
a87295e8 PB	357	if (use_gdb_syscalls()) {
a87295e8 PB	358	gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
7ba6c104	359	arg0, arg1);
a87295e8 PB	360	return;
	361	} else {
	362	struct stat s;
7ba6c104	363	result = fstat(arg0, &s);
a87295e8	364	if (result == 0) {
7ba6c104	365	translate_stat(env, arg1, &s);
a87295e8 PB	366	}
	367	}
	368	break;
	369	case HOSTED_GETTIMEOFDAY:
7ba6c104 PM	370	GET_ARG(0);
7ba6c104 PM	371	GET_ARG(1);
a87295e8 PB	372	if (use_gdb_syscalls()) {
a87295e8 PB	373	gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
7ba6c104	374	arg0, arg1);
a87295e8 PB	375	return;
a87295e8 PB	376	} else {
29b3a662	377	qemu_timeval tv;
a87295e8	378	struct gdb_timeval *p;
29b3a662	379	result = qemu_gettimeofday(&tv);
a87295e8	380	if (result != 0) {
579a97f7	381	if (!(p = lock_user(VERIFY_WRITE,
7ba6c104	382	arg0, sizeof(struct gdb_timeval), 0))) {
579a97f7 FB	383	/* FIXME - check error code? */
	384	result = -1;
	385	} else {
	386	p->tv_sec = cpu_to_be32(tv.tv_sec);
	387	p->tv_usec = cpu_to_be64(tv.tv_usec);
7ba6c104	388	unlock_user(p, arg0, sizeof(struct gdb_timeval));
579a97f7	389	}
a87295e8 PB	390	}
	391	}
	392	break;
	393	case HOSTED_ISATTY:
7ba6c104	394	GET_ARG(0);
a87295e8	395	if (use_gdb_syscalls()) {
7ba6c104	396	gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
a87295e8 PB	397	return;
a87295e8 PB	398	} else {
7ba6c104	399	result = isatty(arg0);
a87295e8 PB	400	}
	401	break;
	402	case HOSTED_SYSTEM:
7ba6c104 PM	403	GET_ARG(0);
7ba6c104 PM	404	GET_ARG(1);
a87295e8 PB	405	if (use_gdb_syscalls()) {
a87295e8 PB	406	gdb_do_syscall(m68k_semi_cb, "system,%s",
7ba6c104	407	arg0, (int)arg1);
a87295e8 PB	408	return;
a87295e8 PB	409	} else {
7ba6c104 PM	410	p = lock_user_string(arg0);
7ba6c104 PM	411	if (!p) {
579a97f7 FB	412	/* FIXME - check error code? */
	413	result = -1;
	414	} else {
	415	result = system(p);
7ba6c104	416	unlock_user(p, arg0, 0);
579a97f7	417	}
a87295e8 PB	418	}
	419	break;
	420	case HOSTED_INIT_SIM:
	421	#if defined(CONFIG_USER_ONLY)
	422	{
0429a971 AF	423	CPUState *cs = CPU(m68k_env_get_cpu(env));
0429a971 AF	424	TaskState *ts = cs->opaque;
a87295e8 PB	425	/* Allocate the heap using sbrk. */
a87295e8 PB	426	if (!ts->heap_limit) {
5382a012	427	abi_ulong ret;
a87295e8 PB	428	uint32_t size;
	429	uint32_t base;
	430
	431	base = do_brk(0);
	432	size = SEMIHOSTING_HEAP_SIZE;
	433	/* Try a big heap, and reduce the size if that fails. */
	434	for (;;) {
	435	ret = do_brk(base + size);
5382a012	436	if (ret >= (base + size)) {
a87295e8	437	break;
5382a012	438	}
a87295e8 PB	439	size >>= 1;
	440	}
	441	ts->heap_limit = base + size;
	442	}
	443	/* This call may happen before we have writable memory, so return
	444	values directly in registers. */
	445	env->dregs[1] = ts->heap_limit;
	446	env->aregs[7] = ts->stack_base;
	447	}
	448	#else
	449	/* FIXME: This is wrong for boards where RAM does not start at
	450	address zero. */
	451	env->dregs[1] = ram_size;
	452	env->aregs[7] = ram_size;
	453	#endif
	454	return;
	455	default:
a47dddd7	456	cpu_abort(CPU(m68k_env_get_cpu(env)), "Unsupported semihosting syscall %d\n", nr);
a87295e8 PB	457	result = 0;
a87295e8 PB	458	}
7ba6c104	459	failed:
1073bfd8	460	m68k_semi_return_u32(env, result, errno);
a87295e8	461	}