/*

 *  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, write to the Free Software

 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include <sys/types.h>

#include <sys/stat.h>

#include <errno.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdlib.h>

#include <stdio.h>

#include <sys/time.h>

#include <time.h>

#include "cpu.h"

#if defined(CONFIG_USER_ONLY)

#include "qemu.h"

#define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)

#else

#include "qemu-common.h"

#include "sysemu.h"

#include "gdbstub.h"

#include "softmmu-semi.h"

#endif

#define HOSTED_EXIT  0

#define HOSTED_INIT_SIM 1

#define HOSTED_OPEN 2

#define HOSTED_CLOSE 3

#define HOSTED_READ 4

#define HOSTED_WRITE 5

#define HOSTED_LSEEK 6

#define HOSTED_RENAME 7

#define HOSTED_UNLINK 8

#define HOSTED_STAT 9

#define HOSTED_FSTAT 10

#define HOSTED_GETTIMEOFDAY 11

#define HOSTED_ISATTY 12

#define HOSTED_SYSTEM 13

typedef uint32_t gdb_mode_t;

typedef uint32_t gdb_time_t;

struct m68k_gdb_stat {

  uint32_t    gdb_st_dev;     /* device */

  uint32_t    gdb_st_ino;     /* inode */

  gdb_mode_t  gdb_st_mode;    /* protection */

  uint32_t    gdb_st_nlink;   /* number of hard links */

  uint32_t    gdb_st_uid;     /* user ID of owner */

  uint32_t    gdb_st_gid;     /* group ID of owner */

  uint32_t    gdb_st_rdev;    /* device type (if inode device) */

  uint64_t    gdb_st_size;    /* total size, in bytes */

  uint64_t    gdb_st_blksize; /* blocksize for filesystem I/O */

  uint64_t    gdb_st_blocks;  /* number of blocks allocated */

  gdb_time_t  gdb_st_atime;   /* time of last access */

  gdb_time_t  gdb_st_mtime;   /* time of last modification */

  gdb_time_t  gdb_st_ctime;   /* time of last change */

} __attribute__((packed));

struct gdb_timeval {

  gdb_time_t tv_sec;  /* second */

  uint64_t tv_usec;   /* microsecond */

} __attribute__((packed));

#define GDB_O_RDONLY   0x0

#define GDB_O_WRONLY   0x1

#define GDB_O_RDWR     0x2

#define GDB_O_APPEND   0x8

#define GDB_O_CREAT  0x200

#define GDB_O_TRUNC  0x400

#define GDB_O_EXCL   0x800

static int translate_openflags(int flags)

{

    int hf;

    if (flags & GDB_O_WRONLY)

        hf = O_WRONLY;

    else if (flags & GDB_O_RDWR)

        hf = O_RDWR;

    else

        hf = O_RDONLY;

    if (flags & GDB_O_APPEND) hf |= O_APPEND;

    if (flags & GDB_O_CREAT) hf |= O_CREAT;

    if (flags & GDB_O_TRUNC) hf |= O_TRUNC;

    if (flags & GDB_O_EXCL) hf |= O_EXCL;

    return hf;

}

static void translate_stat(CPUState *env, target_ulong addr, struct stat *s)

{

    struct m68k_gdb_stat *p;

    if (!(p = lock_user(VERIFY_WRITE, addr, sizeof(struct m68k_gdb_stat), 0)))

        /* FIXME - should this return an error code? */

        return;

    p->gdb_st_dev = cpu_to_be32(s->st_dev);

    p->gdb_st_ino = cpu_to_be32(s->st_ino);

    p->gdb_st_mode = cpu_to_be32(s->st_mode);

    p->gdb_st_nlink = cpu_to_be32(s->st_nlink);

    p->gdb_st_uid = cpu_to_be32(s->st_uid);

    p->gdb_st_gid = cpu_to_be32(s->st_gid);

    p->gdb_st_rdev = cpu_to_be32(s->st_rdev);

    p->gdb_st_size = cpu_to_be64(s->st_size);

#ifdef _WIN32

    /* Windows stat is missing some fields.  */

    p->gdb_st_blksize = 0;

    p->gdb_st_blocks = 0;

#else

    p->gdb_st_blksize = cpu_to_be64(s->st_blksize);

    p->gdb_st_blocks = cpu_to_be64(s->st_blocks);

#endif

    p->gdb_st_atime = cpu_to_be32(s->st_atime);

    p->gdb_st_mtime = cpu_to_be32(s->st_mtime);

    p->gdb_st_ctime = cpu_to_be32(s->st_ctime);

    unlock_user(p, addr, sizeof(struct m68k_gdb_stat));

}

static int m68k_semi_is_fseek;

static void m68k_semi_cb(CPUState *env, target_ulong ret, target_ulong err)

{

    target_ulong args;

    args = env->dregs[1];

    if (m68k_semi_is_fseek) {

        /* FIXME: We've already lost the high bits of the fseek

           return value.  */

        /* FIXME - handle put_user() failure */

        put_user_u32(0, args);

        args += 4;

        m68k_semi_is_fseek = 0;

    }

    /* FIXME - handle put_user() failure */

    put_user_u32(ret, args);

    put_user_u32(errno, args + 4);

}

#define ARG(n)					\

({						\

    target_ulong __arg;				\

    /* FIXME - handle get_user() failure */	\

    get_user_ual(__arg, args + (n) * 4);	\

    __arg;					\

})

#define PARG(x) ((unsigned long)ARG(x))

void do_m68k_semihosting(CPUM68KState *env, int nr)

{

    uint32_t args;

    void *p;

    void *q;

    uint32_t len;

    uint32_t result;

    args = env->dregs[1];

    switch (nr) {

    case HOSTED_EXIT:

        /* FIXME: ideally we want to inform gdb about program

	   exit whenever gdb is connected, even if syscalls

	   are not handled by gdb.  */

        if (use_gdb_syscalls())

            gdb_exit(env, env->dregs[0]);

        exit(env->dregs[0]);

    case HOSTED_OPEN:

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "open,%s,%x,%x", ARG(0), (int)ARG(1),

                           ARG(2), ARG(3));

            return;

        } else {

            if (!(p = lock_user_string(ARG(0)))) {

                /* FIXME - check error code? */

                result = -1;

            } else {

		result = uninterrupted_open(p, translate_openflags(ARG(2)), ARG(3));

                unlock_user(p, ARG(0), 0);

            }

        }

        break;

    case HOSTED_CLOSE:

        {

            /* Ignore attempts to close stdin/out/err.  */

            int fd = ARG(0);

            if (fd > 2) {

                if (use_gdb_syscalls()) {

                    gdb_do_syscall(m68k_semi_cb, "close,%x", ARG(0));

                    return;

                } else {

		    result = uninterrupted_close(fd);

                }

            } else {

                result = 0;

            }

            break;

        }

    case HOSTED_READ:

        len = ARG(2);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "read,%x,%x,%x",

                           ARG(0), ARG(1), len);

            return;

        } else {

            if (!(p = lock_user(VERIFY_WRITE, ARG(1), len, 0))) {

                /* FIXME - check error code? */

                result = -1;

            } else {

		result = uninterrupted_read(ARG(0), p, len);

                unlock_user(p, ARG(1), len);

            }

        }

        break;

    case HOSTED_WRITE:

        len = ARG(2);

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "write,%x,%x,%x",

                           ARG(0), ARG(1), len);

            return;

        } else {

            if (!(p = lock_user(VERIFY_READ, ARG(1), len, 1))) {

                /* FIXME - check error code? */

                result = -1;

            } else {

		result = uninterrupted_write(ARG(0), p, len);

                unlock_user(p, ARG(0), 0);

            }

        }

        break;

    case HOSTED_LSEEK:

        {

            uint64_t off;

            off = (uint32_t)ARG(2) | ((uint64_t)ARG(1) << 32);

            if (use_gdb_syscalls()) {

                m68k_semi_is_fseek = 1;

                gdb_do_syscall(m68k_semi_cb, "fseek,%x,%lx,%x",

                               ARG(0), off, ARG(3));

            } else {

                off = lseek(ARG(0), off, ARG(3));

                /* FIXME - handle put_user() failure */

                put_user_u32(off >> 32, args);

                put_user_u32(off, args + 4);

                put_user_u32(errno, args + 8);

            }

            return;

        }

    case HOSTED_RENAME:

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "rename,%s,%s",

                           ARG(0), (int)ARG(1), ARG(2), (int)ARG(3));

            return;

        } else {

            p = lock_user_string(ARG(0));

            q = lock_user_string(ARG(2));

            if (!p || !q) {

                /* FIXME - check error code? */

                result = -1;

            } else {

                result = rename(p, q);

            }

            unlock_user(p, ARG(0), 0);

            unlock_user(q, ARG(2), 0);

        }

        break;

    case HOSTED_UNLINK:

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "unlink,%s",

                           ARG(0), (int)ARG(1));

            return;

        } else {

            if (!(p = lock_user_string(ARG(0)))) {

                /* FIXME - check error code? */

                result = -1;

            } else {

                result = unlink(p);

                unlock_user(p, ARG(0), 0);

            }

        }

        break;

    case HOSTED_STAT:

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "stat,%s,%x",

                           ARG(0), (int)ARG(1), ARG(2));

            return;

        } else {

            struct stat s;

            if (!(p = lock_user_string(ARG(0)))) {

                /* FIXME - check error code? */

                result = -1;

            } else {

                result = stat(p, &s);

                unlock_user(p, ARG(0), 0);

            }

            if (result == 0) {

                translate_stat(env, ARG(2), &s);

            }

        }

        break;

    case HOSTED_FSTAT:

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "fstat,%x,%x",

                           ARG(0), ARG(1));

            return;

        } else {

            struct stat s;

            result = fstat(ARG(0), &s);

            if (result == 0) {

                translate_stat(env, ARG(1), &s);

            }

        }

        break;

    case HOSTED_GETTIMEOFDAY:

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "gettimeofday,%x,%x",

                           ARG(0), ARG(1));

            return;

        } else {

            qemu_timeval tv;

            struct gdb_timeval *p;

            result = qemu_gettimeofday(&tv);

            if (result != 0) {

                if (!(p = lock_user(VERIFY_WRITE,

                                    ARG(0), sizeof(struct gdb_timeval), 0))) {

                    /* FIXME - check error code? */

                    result = -1;

                } else {

                    p->tv_sec = cpu_to_be32(tv.tv_sec);

                    p->tv_usec = cpu_to_be64(tv.tv_usec);

                    unlock_user(p, ARG(0), sizeof(struct gdb_timeval));

                }

            }

        }

        break;

    case HOSTED_ISATTY:

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "isatty,%x", ARG(0));

            return;

        } else {

            result = isatty(ARG(0));

        }

        break;

    case HOSTED_SYSTEM:

        if (use_gdb_syscalls()) {

            gdb_do_syscall(m68k_semi_cb, "system,%s",

                           ARG(0), (int)ARG(1));

            return;

        } else {

            if (!(p = lock_user_string(ARG(0)))) {

                /* FIXME - check error code? */

                result = -1;

            } else {

                result = system(p);

                unlock_user(p, ARG(0), 0);

            }

        }

        break;

    case HOSTED_INIT_SIM:

#if defined(CONFIG_USER_ONLY)

        {

        TaskState *ts = env->opaque;

        /* Allocate the heap using sbrk.  */

        if (!ts->heap_limit) {

            long ret;

            uint32_t size;

            uint32_t base;

            base = do_brk(0);

            size = SEMIHOSTING_HEAP_SIZE;

            /* Try a big heap, and reduce the size if that fails.  */

            for (;;) {

                ret = do_brk(base + size);

                if (ret != -1)

                    break;

                size >>= 1;

            }

            ts->heap_limit = base + size;

        }

        /* This call may happen before we have writable memory, so return

           values directly in registers.  */

        env->dregs[1] = ts->heap_limit;

        env->aregs[7] = ts->stack_base;

        }

#else

        /* FIXME: This is wrong for boards where RAM does not start at

           address zero.  */

        env->dregs[1] = ram_size;

        env->aregs[7] = ram_size;

#endif

        return;

    default:

        cpu_abort(env, "Unsupported semihosting syscall %d\n", nr);

        result = 0;

    }

    /* FIXME - handle put_user() failure */

    put_user_u32(result, args);

    put_user_u32(errno, args + 4);

}