[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 "exec/gdbstub.h"
#include "exec/softmmu-semi.h"
#include "hw/boards.h"
#endif
#include "qemu/log.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 = env_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] = current_machine->ram_size;
        env->aregs[7] = current_machine->ram_size;
#endif
        return;
    default:
        cpu_abort(env_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
022c62cb PB	27	#include "exec/gdbstub.h"
022c62cb PB	28	#include "exec/softmmu-semi.h"
5601d241	29	#include "hw/boards.h"
a87295e8	30	#endif
63c91552	31	#include "qemu/log.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)) {
808d77bc LMP	133	/*
808d77bc LMP	134	* The m68k semihosting ABI does not provide any way to report this
1073bfd8 PM	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	162	if (m68k_semi_is_fseek) {
808d77bc LMP	163	/*
	164	* FIXME: We've already lost the high bits of the fseek
	165	* return value.
	166	*/
1073bfd8	167	m68k_semi_return_u64(env, ret, err);
a87295e8	168	m68k_semi_is_fseek = 0;
1073bfd8 PM	169	} else {
1073bfd8 PM	170	m68k_semi_return_u32(env, ret, err);
a87295e8	171	}
a87295e8 PB	172	}
a87295e8 PB	173
808d77bc LMP	174	/*
808d77bc LMP	175	* Read the input value from the argument block; fail the semihosting
7ba6c104 PM	176	* call if the memory read fails.
	177	*/
	178	#define GET_ARG(n) do { \
	179	if (get_user_ual(arg ## n, args + (n) * 4)) { \
	180	result = -1; \
	181	errno = EFAULT; \
	182	goto failed; \
	183	} \
	184	} while (0)
	185
a87295e8 PB	186	void do_m68k_semihosting(CPUM68KState *env, int nr)
	187	{
	188	uint32_t args;
7ba6c104	189	target_ulong arg0, arg1, arg2, arg3;
a87295e8 PB	190	void *p;
	191	void *q;
	192	uint32_t len;
	193	uint32_t result;
	194
	195	args = env->dregs[1];
	196	switch (nr) {
	197	case HOSTED_EXIT:
0e1c9c54	198	gdb_exit(env, env->dregs[0]);
a87295e8 PB	199	exit(env->dregs[0]);
a87295e8 PB	200	case HOSTED_OPEN:
7ba6c104 PM	201	GET_ARG(0);
	202	GET_ARG(1);
	203	GET_ARG(2);
	204	GET_ARG(3);
a87295e8	205	if (use_gdb_syscalls()) {
7ba6c104 PM	206	gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
7ba6c104 PM	207	arg2, arg3);
a87295e8 PB	208	return;
a87295e8 PB	209	} else {
7ba6c104 PM	210	p = lock_user_string(arg0);
7ba6c104 PM	211	if (!p) {
579a97f7 FB	212	/* FIXME - check error code? */
	213	result = -1;
	214	} else {
7ba6c104 PM	215	result = open(p, translate_openflags(arg2), arg3);
7ba6c104 PM	216	unlock_user(p, arg0, 0);
579a97f7	217	}
a87295e8 PB	218	}
	219	break;
	220	case HOSTED_CLOSE:
	221	{
	222	/* Ignore attempts to close stdin/out/err. */
7ba6c104 PM	223	GET_ARG(0);
7ba6c104 PM	224	int fd = arg0;
a87295e8 PB	225	if (fd > 2) {
a87295e8 PB	226	if (use_gdb_syscalls()) {
7ba6c104	227	gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
a87295e8 PB	228	return;
	229	} else {
	230	result = close(fd);
	231	}
	232	} else {
	233	result = 0;
	234	}
	235	break;
	236	}
	237	case HOSTED_READ:
7ba6c104 PM	238	GET_ARG(0);
	239	GET_ARG(1);
	240	GET_ARG(2);
	241	len = arg2;
a87295e8 PB	242	if (use_gdb_syscalls()) {
a87295e8 PB	243	gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
7ba6c104	244	arg0, arg1, len);
a87295e8 PB	245	return;
a87295e8 PB	246	} else {
7ba6c104 PM	247	p = lock_user(VERIFY_WRITE, arg1, len, 0);
7ba6c104 PM	248	if (!p) {
579a97f7 FB	249	/* FIXME - check error code? */
	250	result = -1;
	251	} else {
7ba6c104 PM	252	result = read(arg0, p, len);
7ba6c104 PM	253	unlock_user(p, arg1, len);
579a97f7	254	}
a87295e8 PB	255	}
	256	break;
	257	case HOSTED_WRITE:
7ba6c104 PM	258	GET_ARG(0);
	259	GET_ARG(1);
	260	GET_ARG(2);
	261	len = arg2;
a87295e8 PB	262	if (use_gdb_syscalls()) {
a87295e8 PB	263	gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
7ba6c104	264	arg0, arg1, len);
a87295e8 PB	265	return;
a87295e8 PB	266	} else {
7ba6c104 PM	267	p = lock_user(VERIFY_READ, arg1, len, 1);
7ba6c104 PM	268	if (!p) {
579a97f7 FB	269	/* FIXME - check error code? */
	270	result = -1;
	271	} else {
7ba6c104 PM	272	result = write(arg0, p, len);
7ba6c104 PM	273	unlock_user(p, arg0, 0);
579a97f7	274	}
a87295e8 PB	275	}
	276	break;
	277	case HOSTED_LSEEK:
	278	{
	279	uint64_t off;
7ba6c104 PM	280	GET_ARG(0);
	281	GET_ARG(1);
	282	GET_ARG(2);
	283	GET_ARG(3);
	284	off = (uint32_t)arg2 \| ((uint64_t)arg1 << 32);
a87295e8 PB	285	if (use_gdb_syscalls()) {
	286	m68k_semi_is_fseek = 1;
	287	gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
7ba6c104	288	arg0, off, arg3);
a87295e8	289	} else {
7ba6c104	290	off = lseek(arg0, off, arg3);
1073bfd8	291	m68k_semi_return_u64(env, off, errno);
a87295e8 PB	292	}
	293	return;
	294	}
	295	case HOSTED_RENAME:
7ba6c104 PM	296	GET_ARG(0);
	297	GET_ARG(1);
	298	GET_ARG(2);
	299	GET_ARG(3);
a87295e8	300	if (use_gdb_syscalls()) {
5fafdf24	301	gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
7ba6c104	302	arg0, (int)arg1, arg2, (int)arg3);
a87295e8 PB	303	return;
a87295e8 PB	304	} else {
7ba6c104 PM	305	p = lock_user_string(arg0);
7ba6c104 PM	306	q = lock_user_string(arg2);
579a97f7 FB	307	if (!p \|\| !q) {
	308	/* FIXME - check error code? */
	309	result = -1;
	310	} else {
	311	result = rename(p, q);
	312	}
7ba6c104 PM	313	unlock_user(p, arg0, 0);
7ba6c104 PM	314	unlock_user(q, arg2, 0);
a87295e8 PB	315	}
	316	break;
	317	case HOSTED_UNLINK:
7ba6c104 PM	318	GET_ARG(0);
7ba6c104 PM	319	GET_ARG(1);
a87295e8 PB	320	if (use_gdb_syscalls()) {
a87295e8 PB	321	gdb_do_syscall(m68k_semi_cb, "unlink,%s",
7ba6c104	322	arg0, (int)arg1);
a87295e8 PB	323	return;
a87295e8 PB	324	} else {
7ba6c104 PM	325	p = lock_user_string(arg0);
7ba6c104 PM	326	if (!p) {
579a97f7 FB	327	/* FIXME - check error code? */
	328	result = -1;
	329	} else {
	330	result = unlink(p);
7ba6c104	331	unlock_user(p, arg0, 0);
579a97f7	332	}
a87295e8 PB	333	}
	334	break;
	335	case HOSTED_STAT:
7ba6c104 PM	336	GET_ARG(0);
	337	GET_ARG(1);
	338	GET_ARG(2);
a87295e8 PB	339	if (use_gdb_syscalls()) {
a87295e8 PB	340	gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
7ba6c104	341	arg0, (int)arg1, arg2);
a87295e8 PB	342	return;
	343	} else {
	344	struct stat s;
7ba6c104 PM	345	p = lock_user_string(arg0);
7ba6c104 PM	346	if (!p) {
579a97f7 FB	347	/* FIXME - check error code? */
	348	result = -1;
	349	} else {
	350	result = stat(p, &s);
7ba6c104	351	unlock_user(p, arg0, 0);
579a97f7	352	}
a87295e8	353	if (result == 0) {
7ba6c104	354	translate_stat(env, arg2, &s);
a87295e8 PB	355	}
	356	}
	357	break;
	358	case HOSTED_FSTAT:
7ba6c104 PM	359	GET_ARG(0);
7ba6c104 PM	360	GET_ARG(1);
a87295e8 PB	361	if (use_gdb_syscalls()) {
a87295e8 PB	362	gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
7ba6c104	363	arg0, arg1);
a87295e8 PB	364	return;
	365	} else {
	366	struct stat s;
7ba6c104	367	result = fstat(arg0, &s);
a87295e8	368	if (result == 0) {
7ba6c104	369	translate_stat(env, arg1, &s);
a87295e8 PB	370	}
	371	}
	372	break;
	373	case HOSTED_GETTIMEOFDAY:
7ba6c104 PM	374	GET_ARG(0);
7ba6c104 PM	375	GET_ARG(1);
a87295e8 PB	376	if (use_gdb_syscalls()) {
a87295e8 PB	377	gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
7ba6c104	378	arg0, arg1);
a87295e8 PB	379	return;
a87295e8 PB	380	} else {
29b3a662	381	qemu_timeval tv;
a87295e8	382	struct gdb_timeval *p;
29b3a662	383	result = qemu_gettimeofday(&tv);
a87295e8	384	if (result != 0) {
579a97f7	385	if (!(p = lock_user(VERIFY_WRITE,
7ba6c104	386	arg0, sizeof(struct gdb_timeval), 0))) {
579a97f7 FB	387	/* FIXME - check error code? */
	388	result = -1;
	389	} else {
	390	p->tv_sec = cpu_to_be32(tv.tv_sec);
	391	p->tv_usec = cpu_to_be64(tv.tv_usec);
7ba6c104	392	unlock_user(p, arg0, sizeof(struct gdb_timeval));
579a97f7	393	}
a87295e8 PB	394	}
	395	}
	396	break;
	397	case HOSTED_ISATTY:
7ba6c104	398	GET_ARG(0);
a87295e8	399	if (use_gdb_syscalls()) {
7ba6c104	400	gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
a87295e8 PB	401	return;
a87295e8 PB	402	} else {
7ba6c104	403	result = isatty(arg0);
a87295e8 PB	404	}
	405	break;
	406	case HOSTED_SYSTEM:
7ba6c104 PM	407	GET_ARG(0);
7ba6c104 PM	408	GET_ARG(1);
a87295e8 PB	409	if (use_gdb_syscalls()) {
a87295e8 PB	410	gdb_do_syscall(m68k_semi_cb, "system,%s",
7ba6c104	411	arg0, (int)arg1);
a87295e8 PB	412	return;
a87295e8 PB	413	} else {
7ba6c104 PM	414	p = lock_user_string(arg0);
7ba6c104 PM	415	if (!p) {
579a97f7 FB	416	/* FIXME - check error code? */
	417	result = -1;
	418	} else {
	419	result = system(p);
7ba6c104	420	unlock_user(p, arg0, 0);
579a97f7	421	}
a87295e8 PB	422	}
	423	break;
	424	case HOSTED_INIT_SIM:
	425	#if defined(CONFIG_USER_ONLY)
	426	{
a8d92fd8	427	CPUState *cs = env_cpu(env);
0429a971	428	TaskState *ts = cs->opaque;
a87295e8 PB	429	/* Allocate the heap using sbrk. */
a87295e8 PB	430	if (!ts->heap_limit) {
5382a012	431	abi_ulong ret;
a87295e8 PB	432	uint32_t size;
	433	uint32_t base;
	434
	435	base = do_brk(0);
	436	size = SEMIHOSTING_HEAP_SIZE;
	437	/* Try a big heap, and reduce the size if that fails. */
	438	for (;;) {
	439	ret = do_brk(base + size);
5382a012	440	if (ret >= (base + size)) {
a87295e8	441	break;
5382a012	442	}
a87295e8 PB	443	size >>= 1;
	444	}
	445	ts->heap_limit = base + size;
	446	}
808d77bc LMP	447	/*
	448	* This call may happen before we have writable memory, so return
	449	* values directly in registers.
	450	*/
a87295e8 PB	451	env->dregs[1] = ts->heap_limit;
	452	env->aregs[7] = ts->stack_base;
	453	}
	454	#else
808d77bc LMP	455	/*
	456	* FIXME: This is wrong for boards where RAM does not start at
	457	* address zero.
	458	*/
5601d241 PB	459	env->dregs[1] = current_machine->ram_size;
5601d241 PB	460	env->aregs[7] = current_machine->ram_size;
a87295e8 PB	461	#endif
	462	return;
	463	default:
a8d92fd8	464	cpu_abort(env_cpu(env), "Unsupported semihosting syscall %d\n", nr);
a87295e8 PB	465	result = 0;
a87295e8 PB	466	}
7ba6c104	467	failed:
1073bfd8	468	m68k_semi_return_u32(env, result, errno);
a87295e8	469	}