[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 <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 "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)
        {
        TaskState *ts = env->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(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	*/
	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	35	#include "qemu-common.h"
022c62cb PB	36	#include "exec/gdbstub.h"
022c62cb PB	37	#include "exec/softmmu-semi.h"
a87295e8	38	#endif
9c17d615	39	#include "sysemu/sysemu.h"
a87295e8 PB	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 */
541dc0d4	73	} QEMU_PACKED;
a87295e8 PB	74
a87295e8 PB	75	struct gdb_timeval {
c227f099	76	gdb_time_t tv_sec; /* second */
a87295e8	77	uint64_t tv_usec; /* microsecond */
541dc0d4	78	} QEMU_PACKED;
a87295e8 PB	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
71fc85e8	107	static void translate_stat(CPUM68KState env, target_ulong addr, struct stat s)
a87295e8 PB	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
1073bfd8 PM	136	static void m68k_semi_return_u32(CPUM68KState *env, uint32_t ret, uint32_t err)
	137	{
	138	target_ulong args = env->dregs[1];
	139	if (put_user_u32(ret, args) \|\|
	140	put_user_u32(err, args + 4)) {
	141	/* The m68k semihosting ABI does not provide any way to report this
	142	* error to the guest, so the best we can do is log it in qemu.
	143	* It is always a guest error not to pass us a valid argument block.
	144	*/
	145	qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
	146	"discarded because argument block not writable\n");
	147	}
	148	}
	149
	150	static void m68k_semi_return_u64(CPUM68KState *env, uint64_t ret, uint32_t err)
	151	{
	152	target_ulong args = env->dregs[1];
	153	if (put_user_u32(ret >> 32, args) \|\|
	154	put_user_u32(ret, args + 4) \|\|
	155	put_user_u32(err, args + 8)) {
	156	/* No way to report this via m68k semihosting ABI; just log it */
	157	qemu_log_mask(LOG_GUEST_ERROR, "m68k-semihosting: return value "
	158	"discarded because argument block not writable\n");
	159	}
	160	}
	161
a87295e8 PB	162	static int m68k_semi_is_fseek;
a87295e8 PB	163
9e0c5422	164	static void m68k_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
a87295e8	165	{
9e0c5422 AF	166	M68kCPU *cpu = M68K_CPU(cs);
	167	CPUM68KState *env = &cpu->env;
	168
a87295e8 PB	169	if (m68k_semi_is_fseek) {
	170	/* FIXME: We've already lost the high bits of the fseek
	171	return value. */
1073bfd8	172	m68k_semi_return_u64(env, ret, err);
a87295e8	173	m68k_semi_is_fseek = 0;
1073bfd8 PM	174	} else {
1073bfd8 PM	175	m68k_semi_return_u32(env, ret, err);
a87295e8	176	}
a87295e8 PB	177	}
a87295e8 PB	178
7ba6c104 PM	179	/* Read the input value from the argument block; fail the semihosting
	180	* call if the memory read fails.
	181	*/
	182	#define GET_ARG(n) do { \
	183	if (get_user_ual(arg ## n, args + (n) * 4)) { \
	184	result = -1; \
	185	errno = EFAULT; \
	186	goto failed; \
	187	} \
	188	} while (0)
	189
a87295e8 PB	190	void do_m68k_semihosting(CPUM68KState *env, int nr)
	191	{
	192	uint32_t args;
7ba6c104	193	target_ulong arg0, arg1, arg2, arg3;
a87295e8 PB	194	void *p;
	195	void *q;
	196	uint32_t len;
	197	uint32_t result;
	198
	199	args = env->dregs[1];
	200	switch (nr) {
	201	case HOSTED_EXIT:
0e1c9c54	202	gdb_exit(env, env->dregs[0]);
a87295e8 PB	203	exit(env->dregs[0]);
a87295e8 PB	204	case HOSTED_OPEN:
7ba6c104 PM	205	GET_ARG(0);
	206	GET_ARG(1);
	207	GET_ARG(2);
	208	GET_ARG(3);
a87295e8	209	if (use_gdb_syscalls()) {
7ba6c104 PM	210	gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", arg0, (int)arg1,
7ba6c104 PM	211	arg2, arg3);
a87295e8 PB	212	return;
a87295e8 PB	213	} else {
7ba6c104 PM	214	p = lock_user_string(arg0);
7ba6c104 PM	215	if (!p) {
579a97f7 FB	216	/* FIXME - check error code? */
	217	result = -1;
	218	} else {
7ba6c104 PM	219	result = open(p, translate_openflags(arg2), arg3);
7ba6c104 PM	220	unlock_user(p, arg0, 0);
579a97f7	221	}
a87295e8 PB	222	}
	223	break;
	224	case HOSTED_CLOSE:
	225	{
	226	/* Ignore attempts to close stdin/out/err. */
7ba6c104 PM	227	GET_ARG(0);
7ba6c104 PM	228	int fd = arg0;
a87295e8 PB	229	if (fd > 2) {
a87295e8 PB	230	if (use_gdb_syscalls()) {
7ba6c104	231	gdb_do_syscall(m68k_semi_cb, "close,%x", arg0);
a87295e8 PB	232	return;
	233	} else {
	234	result = close(fd);
	235	}
	236	} else {
	237	result = 0;
	238	}
	239	break;
	240	}
	241	case HOSTED_READ:
7ba6c104 PM	242	GET_ARG(0);
	243	GET_ARG(1);
	244	GET_ARG(2);
	245	len = arg2;
a87295e8 PB	246	if (use_gdb_syscalls()) {
a87295e8 PB	247	gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",
7ba6c104	248	arg0, arg1, len);
a87295e8 PB	249	return;
a87295e8 PB	250	} else {
7ba6c104 PM	251	p = lock_user(VERIFY_WRITE, arg1, len, 0);
7ba6c104 PM	252	if (!p) {
579a97f7 FB	253	/* FIXME - check error code? */
	254	result = -1;
	255	} else {
7ba6c104 PM	256	result = read(arg0, p, len);
7ba6c104 PM	257	unlock_user(p, arg1, len);
579a97f7	258	}
a87295e8 PB	259	}
	260	break;
	261	case HOSTED_WRITE:
7ba6c104 PM	262	GET_ARG(0);
	263	GET_ARG(1);
	264	GET_ARG(2);
	265	len = arg2;
a87295e8 PB	266	if (use_gdb_syscalls()) {
a87295e8 PB	267	gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",
7ba6c104	268	arg0, arg1, len);
a87295e8 PB	269	return;
a87295e8 PB	270	} else {
7ba6c104 PM	271	p = lock_user(VERIFY_READ, arg1, len, 1);
7ba6c104 PM	272	if (!p) {
579a97f7 FB	273	/* FIXME - check error code? */
	274	result = -1;
	275	} else {
7ba6c104 PM	276	result = write(arg0, p, len);
7ba6c104 PM	277	unlock_user(p, arg0, 0);
579a97f7	278	}
a87295e8 PB	279	}
	280	break;
	281	case HOSTED_LSEEK:
	282	{
	283	uint64_t off;
7ba6c104 PM	284	GET_ARG(0);
	285	GET_ARG(1);
	286	GET_ARG(2);
	287	GET_ARG(3);
	288	off = (uint32_t)arg2 \| ((uint64_t)arg1 << 32);
a87295e8 PB	289	if (use_gdb_syscalls()) {
	290	m68k_semi_is_fseek = 1;
	291	gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",
7ba6c104	292	arg0, off, arg3);
a87295e8	293	} else {
7ba6c104	294	off = lseek(arg0, off, arg3);
1073bfd8	295	m68k_semi_return_u64(env, off, errno);
a87295e8 PB	296	}
	297	return;
	298	}
	299	case HOSTED_RENAME:
7ba6c104 PM	300	GET_ARG(0);
	301	GET_ARG(1);
	302	GET_ARG(2);
	303	GET_ARG(3);
a87295e8	304	if (use_gdb_syscalls()) {
5fafdf24	305	gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",
7ba6c104	306	arg0, (int)arg1, arg2, (int)arg3);
a87295e8 PB	307	return;
a87295e8 PB	308	} else {
7ba6c104 PM	309	p = lock_user_string(arg0);
7ba6c104 PM	310	q = lock_user_string(arg2);
579a97f7 FB	311	if (!p \|\| !q) {
	312	/* FIXME - check error code? */
	313	result = -1;
	314	} else {
	315	result = rename(p, q);
	316	}
7ba6c104 PM	317	unlock_user(p, arg0, 0);
7ba6c104 PM	318	unlock_user(q, arg2, 0);
a87295e8 PB	319	}
	320	break;
	321	case HOSTED_UNLINK:
7ba6c104 PM	322	GET_ARG(0);
7ba6c104 PM	323	GET_ARG(1);
a87295e8 PB	324	if (use_gdb_syscalls()) {
a87295e8 PB	325	gdb_do_syscall(m68k_semi_cb, "unlink,%s",
7ba6c104	326	arg0, (int)arg1);
a87295e8 PB	327	return;
a87295e8 PB	328	} else {
7ba6c104 PM	329	p = lock_user_string(arg0);
7ba6c104 PM	330	if (!p) {
579a97f7 FB	331	/* FIXME - check error code? */
	332	result = -1;
	333	} else {
	334	result = unlink(p);
7ba6c104	335	unlock_user(p, arg0, 0);
579a97f7	336	}
a87295e8 PB	337	}
	338	break;
	339	case HOSTED_STAT:
7ba6c104 PM	340	GET_ARG(0);
	341	GET_ARG(1);
	342	GET_ARG(2);
a87295e8 PB	343	if (use_gdb_syscalls()) {
a87295e8 PB	344	gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",
7ba6c104	345	arg0, (int)arg1, arg2);
a87295e8 PB	346	return;
	347	} else {
	348	struct stat s;
7ba6c104 PM	349	p = lock_user_string(arg0);
7ba6c104 PM	350	if (!p) {
579a97f7 FB	351	/* FIXME - check error code? */
	352	result = -1;
	353	} else {
	354	result = stat(p, &s);
7ba6c104	355	unlock_user(p, arg0, 0);
579a97f7	356	}
a87295e8	357	if (result == 0) {
7ba6c104	358	translate_stat(env, arg2, &s);
a87295e8 PB	359	}
	360	}
	361	break;
	362	case HOSTED_FSTAT:
7ba6c104 PM	363	GET_ARG(0);
7ba6c104 PM	364	GET_ARG(1);
a87295e8 PB	365	if (use_gdb_syscalls()) {
a87295e8 PB	366	gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",
7ba6c104	367	arg0, arg1);
a87295e8 PB	368	return;
	369	} else {
	370	struct stat s;
7ba6c104	371	result = fstat(arg0, &s);
a87295e8	372	if (result == 0) {
7ba6c104	373	translate_stat(env, arg1, &s);
a87295e8 PB	374	}
	375	}
	376	break;
	377	case HOSTED_GETTIMEOFDAY:
7ba6c104 PM	378	GET_ARG(0);
7ba6c104 PM	379	GET_ARG(1);
a87295e8 PB	380	if (use_gdb_syscalls()) {
a87295e8 PB	381	gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",
7ba6c104	382	arg0, arg1);
a87295e8 PB	383	return;
a87295e8 PB	384	} else {
29b3a662	385	qemu_timeval tv;
a87295e8	386	struct gdb_timeval *p;
29b3a662	387	result = qemu_gettimeofday(&tv);
a87295e8	388	if (result != 0) {
579a97f7	389	if (!(p = lock_user(VERIFY_WRITE,
7ba6c104	390	arg0, sizeof(struct gdb_timeval), 0))) {
579a97f7 FB	391	/* FIXME - check error code? */
	392	result = -1;
	393	} else {
	394	p->tv_sec = cpu_to_be32(tv.tv_sec);
	395	p->tv_usec = cpu_to_be64(tv.tv_usec);
7ba6c104	396	unlock_user(p, arg0, sizeof(struct gdb_timeval));
579a97f7	397	}
a87295e8 PB	398	}
	399	}
	400	break;
	401	case HOSTED_ISATTY:
7ba6c104	402	GET_ARG(0);
a87295e8	403	if (use_gdb_syscalls()) {
7ba6c104	404	gdb_do_syscall(m68k_semi_cb, "isatty,%x", arg0);
a87295e8 PB	405	return;
a87295e8 PB	406	} else {
7ba6c104	407	result = isatty(arg0);
a87295e8 PB	408	}
	409	break;
	410	case HOSTED_SYSTEM:
7ba6c104 PM	411	GET_ARG(0);
7ba6c104 PM	412	GET_ARG(1);
a87295e8 PB	413	if (use_gdb_syscalls()) {
a87295e8 PB	414	gdb_do_syscall(m68k_semi_cb, "system,%s",
7ba6c104	415	arg0, (int)arg1);
a87295e8 PB	416	return;
a87295e8 PB	417	} else {
7ba6c104 PM	418	p = lock_user_string(arg0);
7ba6c104 PM	419	if (!p) {
579a97f7 FB	420	/* FIXME - check error code? */
	421	result = -1;
	422	} else {
	423	result = system(p);
7ba6c104	424	unlock_user(p, arg0, 0);
579a97f7	425	}
a87295e8 PB	426	}
	427	break;
	428	case HOSTED_INIT_SIM:
	429	#if defined(CONFIG_USER_ONLY)
	430	{
	431	TaskState *ts = env->opaque;
	432	/* Allocate the heap using sbrk. */
	433	if (!ts->heap_limit) {
5382a012	434	abi_ulong ret;
a87295e8 PB	435	uint32_t size;
	436	uint32_t base;
	437
	438	base = do_brk(0);
	439	size = SEMIHOSTING_HEAP_SIZE;
	440	/* Try a big heap, and reduce the size if that fails. */
	441	for (;;) {
	442	ret = do_brk(base + size);
5382a012	443	if (ret >= (base + size)) {
a87295e8	444	break;
5382a012	445	}
a87295e8 PB	446	size >>= 1;
	447	}
	448	ts->heap_limit = base + size;
	449	}
	450	/* This call may happen before we have writable memory, so return
	451	values directly in registers. */
	452	env->dregs[1] = ts->heap_limit;
	453	env->aregs[7] = ts->stack_base;
	454	}
	455	#else
	456	/* FIXME: This is wrong for boards where RAM does not start at
	457	address zero. */
	458	env->dregs[1] = ram_size;
	459	env->aregs[7] = ram_size;
	460	#endif
	461	return;
	462	default:
	463	cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);
	464	result = 0;
	465	}
7ba6c104	466	failed:
1073bfd8	467	m68k_semi_return_u32(env, result, errno);
a87295e8	468	}