[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 "qemu/log.h"
#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
63c91552	31	#include "qemu/log.h"
9c17d615	32	#include "sysemu/sysemu.h"
a87295e8 PB	33
	34	#define HOSTED_EXIT 0
	35	#define HOSTED_INIT_SIM 1
	36	#define HOSTED_OPEN 2
	37	#define HOSTED_CLOSE 3
	38	#define HOSTED_READ 4
	39	#define HOSTED_WRITE 5
	40	#define HOSTED_LSEEK 6
	41	#define HOSTED_RENAME 7
	42	#define HOSTED_UNLINK 8
	43	#define HOSTED_STAT 9
	44	#define HOSTED_FSTAT 10
	45	#define HOSTED_GETTIMEOFDAY 11
	46	#define HOSTED_ISATTY 12
	47	#define HOSTED_SYSTEM 13
	48
c227f099 AL	49	typedef uint32_t gdb_mode_t;
c227f099 AL	50	typedef uint32_t gdb_time_t;
a87295e8 PB	51
	52	struct m68k_gdb_stat {
	53	uint32_t gdb_st_dev; /* device */
	54	uint32_t gdb_st_ino; /* inode */
c227f099	55	gdb_mode_t gdb_st_mode; /* protection */
a87295e8 PB	56	uint32_t gdb_st_nlink; /* number of hard links */
	57	uint32_t gdb_st_uid; /* user ID of owner */
	58	uint32_t gdb_st_gid; /* group ID of owner */
	59	uint32_t gdb_st_rdev; /* device type (if inode device) */
	60	uint64_t gdb_st_size; /* total size, in bytes */
	61	uint64_t gdb_st_blksize; /* blocksize for filesystem I/O */
	62	uint64_t gdb_st_blocks; /* number of blocks allocated */
c227f099 AL	63	gdb_time_t gdb_st_atime; /* time of last access */
	64	gdb_time_t gdb_st_mtime; /* time of last modification */
	65	gdb_time_t gdb_st_ctime; /* time of last change */
541dc0d4	66	} QEMU_PACKED;
a87295e8 PB	67
a87295e8 PB	68	struct gdb_timeval {
c227f099	69	gdb_time_t tv_sec; /* second */
a87295e8	70	uint64_t tv_usec; /* microsecond */
541dc0d4	71	} QEMU_PACKED;
a87295e8 PB	72
	73	#define GDB_O_RDONLY 0x0
	74	#define GDB_O_WRONLY 0x1
	75	#define GDB_O_RDWR 0x2
	76	#define GDB_O_APPEND 0x8
	77	#define GDB_O_CREAT 0x200
	78	#define GDB_O_TRUNC 0x400
	79	#define GDB_O_EXCL 0x800
	80
	81	static int translate_openflags(int flags)
	82	{
	83	int hf;
	84
	85	if (flags & GDB_O_WRONLY)
	86	hf = O_WRONLY;
	87	else if (flags & GDB_O_RDWR)
	88	hf = O_RDWR;
	89	else
	90	hf = O_RDONLY;
	91
	92	if (flags & GDB_O_APPEND) hf \|= O_APPEND;
	93	if (flags & GDB_O_CREAT) hf \|= O_CREAT;
	94	if (flags & GDB_O_TRUNC) hf \|= O_TRUNC;
	95	if (flags & GDB_O_EXCL) hf \|= O_EXCL;
	96
	97	return hf;
	98	}
	99
71fc85e8	100	static void translate_stat(CPUM68KState env, target_ulong addr, struct stat s)
a87295e8 PB	101	{
	102	struct m68k_gdb_stat *p;
	103
579a97f7 FB	104	if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))
	105	/* FIXME - should this return an error code? */
	106	return;
a87295e8 PB	107	p->gdb_st_dev = cpu_to_be32(s->st_dev);
	108	p->gdb_st_ino = cpu_to_be32(s->st_ino);
	109	p->gdb_st_mode = cpu_to_be32(s->st_mode);
	110	p->gdb_st_nlink = cpu_to_be32(s->st_nlink);
	111	p->gdb_st_uid = cpu_to_be32(s->st_uid);
	112	p->gdb_st_gid = cpu_to_be32(s->st_gid);
	113	p->gdb_st_rdev = cpu_to_be32(s->st_rdev);
	114	p->gdb_st_size = cpu_to_be64(s->st_size);
29b3a662 PB	115	#ifdef _WIN32
	116	/* Windows stat is missing some fields. */
	117	p->gdb_st_blksize = 0;
	118	p->gdb_st_blocks = 0;
	119	#else
a87295e8 PB	120	p->gdb_st_blksize = cpu_to_be64(s->st_blksize);
a87295e8 PB	121	p->gdb_st_blocks = cpu_to_be64(s->st_blocks);
29b3a662	122	#endif
a87295e8 PB	123	p->gdb_st_atime = cpu_to_be32(s->st_atime);
	124	p->gdb_st_mtime = cpu_to_be32(s->st_mtime);
	125	p->gdb_st_ctime = cpu_to_be32(s->st_ctime);
	126	unlock_user(p, addr, sizeof(struct m68k_gdb_stat));
	127	}
	128
1073bfd8 PM	129	static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
	130	{
	131	target_ulong args = env->dregs[1];
	132	if (put_user_u32(ret, args) \|\|
	133	put_user_u32(err, args + 4)) {
	134	/* The m68k semihosting ABI does not provide any way to report this
	135	* error to the guest, so the best we can do is log it in qemu.
	136	* It is always a guest error not to pass us a valid argument block.
	137	*/
	138	qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
	139	"discarded because argument block not writable\n");
	140	}
	141	}
	142
	143	static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err)
	144	{
	145	target_ulong args = env->dregs[1];
	146	if (put_user_u32(ret >> 32, args) \|\|
	147	put_user_u32(ret, args + 4) \|\|
	148	put_user_u32(err, args + 8)) {
	149	/* No way to report this via m68k semihosting ABI; just log it */
	150	qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
	151	"discarded because argument block not writable\n");
	152	}
	153	}
	154
a87295e8 PB	155	static int m68k_semi_is_fseek;
a87295e8 PB	156
9e0c5422	157	static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
a87295e8	158	{
9e0c5422 AF	159	M68kCPU *cpu = M68K_CPU(cs);
	160	CPUM68KState *env = &cpu->env;
	161
a87295e8 PB	162	if (m68k_semi_is_fseek) {
	163	/* FIXME: We've already lost the high bits of the fseek
	164	return value. */
1073bfd8	165	m68k_semi_return_u64(env, ret, err);
a87295e8	166	m68k_semi_is_fseek = 0;
1073bfd8 PM	167	} else {
1073bfd8 PM	168	m68k_semi_return_u32(env, ret, err);
a87295e8	169	}
a87295e8 PB	170	}
a87295e8 PB	171
7ba6c104 PM	172	/* Read the input value from the argument block; fail the semihosting
	173	* call if the memory read fails.
	174	*/
	175	#define GET_ARG(n) do { \
	176	if (get_user_ual(arg ## n, args + (n) * 4)) { \
	177	result = -1; \
	178	errno = EFAULT; \
	179	goto failed; \
	180	} \
	181	} while (0)
	182
a87295e8 PB	183	void do_m68k_semihosting(CPUM68KState *env, int nr)
	184	{
	185	uint32_t args;
7ba6c104	186	target_ulong arg0, arg1, arg2, arg3;
a87295e8 PB	187	void *p;
	188	void *q;
	189	uint32_t len;
	190	uint32_t result;
	191
	192	args = env->dregs[1];
	193	switch (nr) {
	194	case HOSTED_EXIT:
0e1c9c54	195	gdb_exit(env, env->dregs[0]);
a87295e8 PB	196	exit(env->dregs[0]);
a87295e8 PB	197	case HOSTED_OPEN:
7ba6c104 PM	198	GET_ARG(0);
	199	GET_ARG(1);
	200	GET_ARG(2);
	201	GET_ARG(3);
a87295e8	202	if (use_gdb_syscalls()) {
7ba6c104 PM	203	gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
7ba6c104 PM	204	arg2, arg3);
a87295e8 PB	205	return;
a87295e8 PB	206	} else {
7ba6c104 PM	207	p = lock_user_string(arg0);
7ba6c104 PM	208	if (!p) {
579a97f7 FB	209	/* FIXME - check error code? */
	210	result = -1;
	211	} else {
7ba6c104 PM	212	result = open(p, translate_openflags(arg2), arg3);
7ba6c104 PM	213	unlock_user(p, arg0, 0);
579a97f7	214	}
a87295e8 PB	215	}
	216	break;
	217	case HOSTED_CLOSE:
	218	{
	219	/* Ignore attempts to close stdin/out/err. */
7ba6c104 PM	220	GET_ARG(0);
7ba6c104 PM	221	int fd = arg0;
a87295e8 PB	222	if (fd > 2) {
a87295e8 PB	223	if (use_gdb_syscalls()) {
7ba6c104	224	gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
a87295e8 PB	225	return;
	226	} else {
	227	result = close(fd);
	228	}
	229	} else {
	230	result = 0;
	231	}
	232	break;
	233	}
	234	case HOSTED_READ:
7ba6c104 PM	235	GET_ARG(0);
	236	GET_ARG(1);
	237	GET_ARG(2);
	238	len = arg2;
a87295e8 PB	239	if (use_gdb_syscalls()) {
a87295e8 PB	240	gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
7ba6c104	241	arg0, arg1, len);
a87295e8 PB	242	return;
a87295e8 PB	243	} else {
7ba6c104 PM	244	p = lock_user(VERIFY_WRITE, arg1, len, 0);
7ba6c104 PM	245	if (!p) {
579a97f7 FB	246	/* FIXME - check error code? */
	247	result = -1;
	248	} else {
7ba6c104 PM	249	result = read(arg0, p, len);
7ba6c104 PM	250	unlock_user(p, arg1, len);
579a97f7	251	}
a87295e8 PB	252	}
	253	break;
	254	case HOSTED_WRITE:
7ba6c104 PM	255	GET_ARG(0);
	256	GET_ARG(1);
	257	GET_ARG(2);
	258	len = arg2;
a87295e8 PB	259	if (use_gdb_syscalls()) {
a87295e8 PB	260	gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
7ba6c104	261	arg0, arg1, len);
a87295e8 PB	262	return;
a87295e8 PB	263	} else {
7ba6c104 PM	264	p = lock_user(VERIFY_READ, arg1, len, 1);
7ba6c104 PM	265	if (!p) {
579a97f7 FB	266	/* FIXME - check error code? */
	267	result = -1;
	268	} else {
7ba6c104 PM	269	result = write(arg0, p, len);
7ba6c104 PM	270	unlock_user(p, arg0, 0);
579a97f7	271	}
a87295e8 PB	272	}
	273	break;
	274	case HOSTED_LSEEK:
	275	{
	276	uint64_t off;
7ba6c104 PM	277	GET_ARG(0);
	278	GET_ARG(1);
	279	GET_ARG(2);
	280	GET_ARG(3);
	281	off = (uint32_t)arg2 \| ((uint64_t)arg1 << 32);
a87295e8 PB	282	if (use_gdb_syscalls()) {
	283	m68k_semi_is_fseek = 1;
	284	gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
7ba6c104	285	arg0, off, arg3);
a87295e8	286	} else {
7ba6c104	287	off = lseek(arg0, off, arg3);
1073bfd8	288	m68k_semi_return_u64(env, off, errno);
a87295e8 PB	289	}
	290	return;
	291	}
	292	case HOSTED_RENAME:
7ba6c104 PM	293	GET_ARG(0);
	294	GET_ARG(1);
	295	GET_ARG(2);
	296	GET_ARG(3);
a87295e8	297	if (use_gdb_syscalls()) {
5fafdf24	298	gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
7ba6c104	299	arg0, (int)arg1, arg2, (int)arg3);
a87295e8 PB	300	return;
a87295e8 PB	301	} else {
7ba6c104 PM	302	p = lock_user_string(arg0);
7ba6c104 PM	303	q = lock_user_string(arg2);
579a97f7 FB	304	if (!p \|\| !q) {
	305	/* FIXME - check error code? */
	306	result = -1;
	307	} else {
	308	result = rename(p, q);
	309	}
7ba6c104 PM	310	unlock_user(p, arg0, 0);
7ba6c104 PM	311	unlock_user(q, arg2, 0);
a87295e8 PB	312	}
	313	break;
	314	case HOSTED_UNLINK:
7ba6c104 PM	315	GET_ARG(0);
7ba6c104 PM	316	GET_ARG(1);
a87295e8 PB	317	if (use_gdb_syscalls()) {
a87295e8 PB	318	gdb_do_syscall(m68k_semi_cb, "unlink,%s",
7ba6c104	319	arg0, (int)arg1);
a87295e8 PB	320	return;
a87295e8 PB	321	} else {
7ba6c104 PM	322	p = lock_user_string(arg0);
7ba6c104 PM	323	if (!p) {
579a97f7 FB	324	/* FIXME - check error code? */
	325	result = -1;
	326	} else {
	327	result = unlink(p);
7ba6c104	328	unlock_user(p, arg0, 0);
579a97f7	329	}
a87295e8 PB	330	}
	331	break;
	332	case HOSTED_STAT:
7ba6c104 PM	333	GET_ARG(0);
	334	GET_ARG(1);
	335	GET_ARG(2);
a87295e8 PB	336	if (use_gdb_syscalls()) {
a87295e8 PB	337	gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
7ba6c104	338	arg0, (int)arg1, arg2);
a87295e8 PB	339	return;
	340	} else {
	341	struct stat s;
7ba6c104 PM	342	p = lock_user_string(arg0);
7ba6c104 PM	343	if (!p) {
579a97f7 FB	344	/* FIXME - check error code? */
	345	result = -1;
	346	} else {
	347	result = stat(p, &s);
7ba6c104	348	unlock_user(p, arg0, 0);
579a97f7	349	}
a87295e8	350	if (result == 0) {
7ba6c104	351	translate_stat(env, arg2, &s);
a87295e8 PB	352	}
	353	}
	354	break;
	355	case HOSTED_FSTAT:
7ba6c104 PM	356	GET_ARG(0);
7ba6c104 PM	357	GET_ARG(1);
a87295e8 PB	358	if (use_gdb_syscalls()) {
a87295e8 PB	359	gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
7ba6c104	360	arg0, arg1);
a87295e8 PB	361	return;
	362	} else {
	363	struct stat s;
7ba6c104	364	result = fstat(arg0, &s);
a87295e8	365	if (result == 0) {
7ba6c104	366	translate_stat(env, arg1, &s);
a87295e8 PB	367	}
	368	}
	369	break;
	370	case HOSTED_GETTIMEOFDAY:
7ba6c104 PM	371	GET_ARG(0);
7ba6c104 PM	372	GET_ARG(1);
a87295e8 PB	373	if (use_gdb_syscalls()) {
a87295e8 PB	374	gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
7ba6c104	375	arg0, arg1);
a87295e8 PB	376	return;
a87295e8 PB	377	} else {
29b3a662	378	qemu_timeval tv;
a87295e8	379	struct gdb_timeval *p;
29b3a662	380	result = qemu_gettimeofday(&tv);
a87295e8	381	if (result != 0) {
579a97f7	382	if (!(p = lock_user(VERIFY_WRITE,
7ba6c104	383	arg0, sizeof(struct gdb_timeval), 0))) {
579a97f7 FB	384	/* FIXME - check error code? */
	385	result = -1;
	386	} else {
	387	p->tv_sec = cpu_to_be32(tv.tv_sec);
	388	p->tv_usec = cpu_to_be64(tv.tv_usec);
7ba6c104	389	unlock_user(p, arg0, sizeof(struct gdb_timeval));
579a97f7	390	}
a87295e8 PB	391	}
	392	}
	393	break;
	394	case HOSTED_ISATTY:
7ba6c104	395	GET_ARG(0);
a87295e8	396	if (use_gdb_syscalls()) {
7ba6c104	397	gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
a87295e8 PB	398	return;
a87295e8 PB	399	} else {
7ba6c104	400	result = isatty(arg0);
a87295e8 PB	401	}
	402	break;
	403	case HOSTED_SYSTEM:
7ba6c104 PM	404	GET_ARG(0);
7ba6c104 PM	405	GET_ARG(1);
a87295e8 PB	406	if (use_gdb_syscalls()) {
a87295e8 PB	407	gdb_do_syscall(m68k_semi_cb, "system,%s",
7ba6c104	408	arg0, (int)arg1);
a87295e8 PB	409	return;
a87295e8 PB	410	} else {
7ba6c104 PM	411	p = lock_user_string(arg0);
7ba6c104 PM	412	if (!p) {
579a97f7 FB	413	/* FIXME - check error code? */
	414	result = -1;
	415	} else {
	416	result = system(p);
7ba6c104	417	unlock_user(p, arg0, 0);
579a97f7	418	}
a87295e8 PB	419	}
	420	break;
	421	case HOSTED_INIT_SIM:
	422	#if defined(CONFIG_USER_ONLY)
	423	{
0429a971 AF	424	CPUState *cs = CPU(m68k_env_get_cpu(env));
0429a971 AF	425	TaskState *ts = cs->opaque;
a87295e8 PB	426	/* Allocate the heap using sbrk. */
a87295e8 PB	427	if (!ts->heap_limit) {
5382a012	428	abi_ulong ret;
a87295e8 PB	429	uint32_t size;
	430	uint32_t base;
	431
	432	base = do_brk(0);
	433	size = SEMIHOSTING_HEAP_SIZE;
	434	/* Try a big heap, and reduce the size if that fails. */
	435	for (;;) {
	436	ret = do_brk(base + size);
5382a012	437	if (ret >= (base + size)) {
a87295e8	438	break;
5382a012	439	}
a87295e8 PB	440	size >>= 1;
	441	}
	442	ts->heap_limit = base + size;
	443	}
	444	/* This call may happen before we have writable memory, so return
	445	values directly in registers. */
	446	env->dregs[1] = ts->heap_limit;
	447	env->aregs[7] = ts->stack_base;
	448	}
	449	#else
	450	/* FIXME: This is wrong for boards where RAM does not start at
	451	address zero. */
	452	env->dregs[1] = ram_size;
	453	env->aregs[7] = ram_size;
	454	#endif
	455	return;
	456	default:
a47dddd7	457	cpu_abort(CPU(m68k_env_get_cpu(env)), "Unsupported semihosting syscall %d\n", nr);
a87295e8 PB	458	result = 0;
a87295e8 PB	459	}
7ba6c104	460	failed:
1073bfd8	461	m68k_semi_return_u32(env, result, errno);
a87295e8	462	}