[qemu.git] / arm-semi.c

/*
 *  Arm "Angel" semihosting syscalls
 *
 *  Copyright (c) 2005, 2007 CodeSourcery.
 *  Written by Paul Brook.
 *
 *  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 <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

#include "cpu.h"
#ifdef CONFIG_USER_ONLY
#include "qemu.h"

#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
#else
#include "qemu-common.h"
#include "gdbstub.h"
#include "hw/arm-misc.h"
#endif

#define SYS_OPEN        0x01
#define SYS_CLOSE       0x02
#define SYS_WRITEC      0x03
#define SYS_WRITE0      0x04
#define SYS_WRITE       0x05
#define SYS_READ        0x06
#define SYS_READC       0x07
#define SYS_ISTTY       0x09
#define SYS_SEEK        0x0a
#define SYS_FLEN        0x0c
#define SYS_TMPNAM      0x0d
#define SYS_REMOVE      0x0e
#define SYS_RENAME      0x0f
#define SYS_CLOCK       0x10
#define SYS_TIME        0x11
#define SYS_SYSTEM      0x12
#define SYS_ERRNO       0x13
#define SYS_GET_CMDLINE 0x15
#define SYS_HEAPINFO    0x16
#define SYS_EXIT        0x18

#ifndef O_BINARY
#define O_BINARY 0
#endif

#define GDB_O_RDONLY  0x000
#define GDB_O_WRONLY  0x001
#define GDB_O_RDWR    0x002
#define GDB_O_APPEND  0x008
#define GDB_O_CREAT   0x200
#define GDB_O_TRUNC   0x400
#define GDB_O_BINARY  0

static int gdb_open_modeflags[12] = {
    GDB_O_RDONLY,
    GDB_O_RDONLY | GDB_O_BINARY,
    GDB_O_RDWR,
    GDB_O_RDWR | GDB_O_BINARY,
    GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC,
    GDB_O_WRONLY | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
    GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC,
    GDB_O_RDWR | GDB_O_CREAT | GDB_O_TRUNC | GDB_O_BINARY,
    GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND,
    GDB_O_WRONLY | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY,
    GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND,
    GDB_O_RDWR | GDB_O_CREAT | GDB_O_APPEND | GDB_O_BINARY
};

static int open_modeflags[12] = {
    O_RDONLY,
    O_RDONLY | O_BINARY,
    O_RDWR,
    O_RDWR | O_BINARY,
    O_WRONLY | O_CREAT | O_TRUNC,
    O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
    O_RDWR | O_CREAT | O_TRUNC,
    O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
    O_WRONLY | O_CREAT | O_APPEND,
    O_WRONLY | O_CREAT | O_APPEND | O_BINARY,
    O_RDWR | O_CREAT | O_APPEND,
    O_RDWR | O_CREAT | O_APPEND | O_BINARY
};

#ifdef CONFIG_USER_ONLY
static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
{
    if (code == (uint32_t)-1)
        ts->swi_errno = errno;
    return code;
}
#else
static inline uint32_t set_swi_errno(CPUState *env, uint32_t code)
{
    return code;
}

#include "softmmu-semi.h"
#endif

static target_ulong arm_semi_syscall_len;

#if !defined(CONFIG_USER_ONLY)
static target_ulong syscall_err;
#endif

static void arm_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
{
#ifdef CONFIG_USER_ONLY
    TaskState *ts = env->opaque;
#endif

    if (ret == (target_ulong)-1) {
#ifdef CONFIG_USER_ONLY
        ts->swi_errno = err;
#else
	syscall_err = err;
#endif
        env->regs[0] = ret;
    } else {
        /* Fixup syscalls that use nonstardard return conventions.  */
        switch (env->regs[0]) {
        case SYS_WRITE:
        case SYS_READ:
            env->regs[0] = arm_semi_syscall_len - ret;
            break;
        case SYS_SEEK:
            env->regs[0] = 0;
            break;
        default:
            env->regs[0] = ret;
            break;
        }
    }
}

static void arm_semi_flen_cb(CPUState *env, target_ulong ret, target_ulong err)
{
    /* The size is always stored in big-endian order, extract
       the value. We assume the size always fit in 32 bits.  */
    uint32_t size;
    cpu_memory_rw_debug(env, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
    env->regs[0] = be32_to_cpu(size);
#ifdef CONFIG_USER_ONLY
    ((TaskState *)env->opaque)->swi_errno = err;
#else
    syscall_err = err;
#endif
}

#define ARG(n)					\
({						\
    target_ulong __arg;				\
    /* FIXME - handle get_user() failure */	\
    get_user_ual(__arg, args + (n) * 4);	\
    __arg;					\
})
#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
uint32_t do_arm_semihosting(CPUState *env)
{
    target_ulong args;
    char * s;
    int nr;
    uint32_t ret;
    uint32_t len;
#ifdef CONFIG_USER_ONLY
    TaskState *ts = env->opaque;
#else
    CPUState *ts = env;
#endif

    nr = env->regs[0];
    args = env->regs[1];
    switch (nr) {
    case SYS_OPEN:
        if (!(s = lock_user_string(ARG(0))))
            /* FIXME - should this error code be -TARGET_EFAULT ? */
            return (uint32_t)-1;
        if (ARG(1) >= 12)
            return (uint32_t)-1;
        if (strcmp(s, ":tt") == 0) {
            if (ARG(1) < 4)
                return STDIN_FILENO;
            else
                return STDOUT_FILENO;
        }
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0),
			   (int)ARG(2)+1, gdb_open_modeflags[ARG(1)]);
            return env->regs[0];
        } else {
            ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
        }
        unlock_user(s, ARG(0), 0);
        return ret;
    case SYS_CLOSE:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "close,%x", ARG(0));
            return env->regs[0];
        } else {
            return set_swi_errno(ts, close(ARG(0)));
        }
    case SYS_WRITEC:
        {
          char c;

          if (get_user_u8(c, args))
              /* FIXME - should this error code be -TARGET_EFAULT ? */
              return (uint32_t)-1;
          /* Write to debug console.  stderr is near enough.  */
          if (use_gdb_syscalls()) {
                gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
                return env->regs[0];
          } else {
                return write(STDERR_FILENO, &c, 1);
          }
        }
    case SYS_WRITE0:
        if (!(s = lock_user_string(args)))
            /* FIXME - should this error code be -TARGET_EFAULT ? */
            return (uint32_t)-1;
        len = strlen(s);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
            ret = env->regs[0];
        } else {
            ret = write(STDERR_FILENO, s, len);
        }
        unlock_user(s, args, 0);
        return ret;
    case SYS_WRITE:
        len = ARG(2);
        if (use_gdb_syscalls()) {
            arm_semi_syscall_len = len;
            gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len);
            return env->regs[0];
        } else {
            if (!(s = lock_user(VERIFY_READ, ARG(1), len, 1)))
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            ret = set_swi_errno(ts, write(ARG(0), s, len));
            unlock_user(s, ARG(1), 0);
            if (ret == (uint32_t)-1)
                return -1;
            return len - ret;
        }
    case SYS_READ:
        len = ARG(2);
        if (use_gdb_syscalls()) {
            arm_semi_syscall_len = len;
            gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len);
            return env->regs[0];
        } else {
            if (!(s = lock_user(VERIFY_WRITE, ARG(1), len, 0)))
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            do
              ret = set_swi_errno(ts, read(ARG(0), s, len));
            while (ret == -1 && errno == EINTR);
            unlock_user(s, ARG(1), len);
            if (ret == (uint32_t)-1)
                return -1;
            return len - ret;
        }
    case SYS_READC:
       /* XXX: Read from debug cosole. Not implemented.  */
        return 0;
    case SYS_ISTTY:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "isatty,%x", ARG(0));
            return env->regs[0];
        } else {
            return isatty(ARG(0));
        }
    case SYS_SEEK:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", ARG(0), ARG(1));
            return env->regs[0];
        } else {
            ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
            if (ret == (uint32_t)-1)
              return -1;
            return 0;
        }
    case SYS_FLEN:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
			   ARG(0), env->regs[13]-64);
            return env->regs[0];
        } else {
            struct stat buf;
            ret = set_swi_errno(ts, fstat(ARG(0), &buf));
            if (ret == (uint32_t)-1)
                return -1;
            return buf.st_size;
        }
    case SYS_TMPNAM:
        /* XXX: Not implemented.  */
        return -1;
    case SYS_REMOVE:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1);
            ret = env->regs[0];
        } else {
            if (!(s = lock_user_string(ARG(0))))
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            ret =  set_swi_errno(ts, remove(s));
            unlock_user(s, ARG(0), 0);
        }
        return ret;
    case SYS_RENAME:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
                           ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1);
            return env->regs[0];
        } else {
            char *s2;
            s = lock_user_string(ARG(0));
            s2 = lock_user_string(ARG(2));
            if (!s || !s2)
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                ret = (uint32_t)-1;
            else
                ret = set_swi_errno(ts, rename(s, s2));
            if (s2)
                unlock_user(s2, ARG(2), 0);
            if (s)
                unlock_user(s, ARG(0), 0);
            return ret;
        }
    case SYS_CLOCK:
        return clock() / (CLOCKS_PER_SEC / 100);
    case SYS_TIME:
        return set_swi_errno(ts, time(NULL));
    case SYS_SYSTEM:
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1);
            return env->regs[0];
        } else {
            if (!(s = lock_user_string(ARG(0))))
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            ret = set_swi_errno(ts, system(s));
            unlock_user(s, ARG(0), 0);
            return ret;
        }
    case SYS_ERRNO:
#ifdef CONFIG_USER_ONLY
        return ts->swi_errno;
#else
        return syscall_err;
#endif
    case SYS_GET_CMDLINE:
        {
            /* Build a command-line from the original argv.
             *
             * The inputs are:
             *     * ARG(0), pointer to a buffer of at least the size
             *               specified in ARG(1).
             *     * ARG(1), size of the buffer pointed to by ARG(0) in
             *               bytes.
             *
             * The outputs are:
             *     * ARG(0), pointer to null-terminated string of the
             *               command line.
             *     * ARG(1), length of the string pointed to by ARG(0).
             */

            char *output_buffer;
            size_t input_size = ARG(1);
            size_t output_size;
            int status = 0;

            /* Compute the size of the output string.  */
#if !defined(CONFIG_USER_ONLY)
            output_size = strlen(ts->boot_info->kernel_filename)
                        + 1  /* Separating space.  */
                        + strlen(ts->boot_info->kernel_cmdline)
                        + 1; /* Terminating null byte.  */
#else
            unsigned int i;

            output_size = ts->info->arg_end - ts->info->arg_start;
            if (!output_size) {
                /* We special-case the "empty command line" case (argc==0).
                   Just provide the terminating 0. */
                output_size = 1;
            }
#endif

            if (output_size > input_size) {
                 /* Not enough space to store command-line arguments.  */
                return -1;
            }

            /* Adjust the command-line length.  */
            SET_ARG(1, output_size - 1);

            /* Lock the buffer on the ARM side.  */
            output_buffer = lock_user(VERIFY_WRITE, ARG(0), output_size, 0);
            if (!output_buffer) {
                return -1;
            }

            /* Copy the command-line arguments.  */
#if !defined(CONFIG_USER_ONLY)
            pstrcpy(output_buffer, output_size, ts->boot_info->kernel_filename);
            pstrcat(output_buffer, output_size, " ");
            pstrcat(output_buffer, output_size, ts->boot_info->kernel_cmdline);
#else
            if (output_size == 1) {
                /* Empty command-line.  */
                output_buffer[0] = '\0';
                goto out;
            }

            if (copy_from_user(output_buffer, ts->info->arg_start,
                               output_size)) {
                status = -1;
                goto out;
            }

            /* Separate arguments by white spaces.  */
            for (i = 0; i < output_size - 1; i++) {
                if (output_buffer[i] == 0) {
                    output_buffer[i] = ' ';
                }
            }
        out:
#endif
            /* Unlock the buffer on the ARM side.  */
            unlock_user(output_buffer, ARG(0), output_size);

            return status;
        }
    case SYS_HEAPINFO:
        {
            uint32_t *ptr;
            uint32_t limit;

#ifdef CONFIG_USER_ONLY
            /* Some C libraries assume the heap immediately follows .bss, so
               allocate it using sbrk.  */
            if (!ts->heap_limit) {
                abi_ulong ret;

                ts->heap_base = do_brk(0);
                limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
                /* Try a big heap, and reduce the size if that fails.  */
                for (;;) {
                    ret = do_brk(limit);
                    if (ret >= limit) {
                        break;
                    }
                    limit = (ts->heap_base >> 1) + (limit >> 1);
                }
                ts->heap_limit = limit;
            }

            if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            ptr[0] = tswap32(ts->heap_base);
            ptr[1] = tswap32(ts->heap_limit);
            ptr[2] = tswap32(ts->stack_base);
            ptr[3] = tswap32(0); /* Stack limit.  */
            unlock_user(ptr, ARG(0), 16);
#else
            limit = ram_size;
            if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            /* TODO: Make this use the limit of the loaded application.  */
            ptr[0] = tswap32(limit / 2);
            ptr[1] = tswap32(limit);
            ptr[2] = tswap32(limit); /* Stack base */
            ptr[3] = tswap32(0); /* Stack limit.  */
            unlock_user(ptr, ARG(0), 16);
#endif
            return 0;
        }
    case SYS_EXIT:
        gdb_exit(env, 0);
        exit(0);
    default:
        fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
        cpu_dump_state(env, stderr, fprintf, 0);
        abort();
    }
}
Commit	Line	Data
a4f81979 FB	1	/*
a4f81979 FB	2	* Arm "Angel" semihosting syscalls
5fafdf24	3	*
8e71621f PB	4	* Copyright (c) 2005, 2007 CodeSourcery.
8e71621f PB	5	* Written by Paul Brook.
a4f81979 FB	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
8167ee88	18	* along with this program; if not, see <http://www.gnu.org/licenses/>.
a4f81979 FB	19	*/
	20
	21	#include <sys/types.h>
	22	#include <sys/stat.h>
	23	#include <fcntl.h>
	24	#include <unistd.h>
	25	#include <stdlib.h>
	26	#include <stdio.h>
	27	#include <time.h>
	28
8e71621f PB	29	#include "cpu.h"
8e71621f PB	30	#ifdef CONFIG_USER_ONLY
a4f81979 FB	31	#include "qemu.h"
	32
	33	#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
8e71621f	34	#else
87ecb68b	35	#include "qemu-common.h"
87ecb68b	36	#include "gdbstub.h"
1c1b40c1	37	#include "hw/arm-misc.h"
8e71621f	38	#endif
a4f81979 FB	39
	40	#define SYS_OPEN 0x01
	41	#define SYS_CLOSE 0x02
	42	#define SYS_WRITEC 0x03
	43	#define SYS_WRITE0 0x04
	44	#define SYS_WRITE 0x05
	45	#define SYS_READ 0x06
	46	#define SYS_READC 0x07
	47	#define SYS_ISTTY 0x09
	48	#define SYS_SEEK 0x0a
	49	#define SYS_FLEN 0x0c
	50	#define SYS_TMPNAM 0x0d
	51	#define SYS_REMOVE 0x0e
	52	#define SYS_RENAME 0x0f
	53	#define SYS_CLOCK 0x10
	54	#define SYS_TIME 0x11
	55	#define SYS_SYSTEM 0x12
	56	#define SYS_ERRNO 0x13
	57	#define SYS_GET_CMDLINE 0x15
	58	#define SYS_HEAPINFO 0x16
	59	#define SYS_EXIT 0x18
	60
	61	#ifndef O_BINARY
	62	#define O_BINARY 0
	63	#endif
	64
a2d1ebaf PB	65	#define GDB_O_RDONLY 0x000
	66	#define GDB_O_WRONLY 0x001
	67	#define GDB_O_RDWR 0x002
	68	#define GDB_O_APPEND 0x008
	69	#define GDB_O_CREAT 0x200
	70	#define GDB_O_TRUNC 0x400
	71	#define GDB_O_BINARY 0
	72
	73	static int gdb_open_modeflags[12] = {
	74	GDB_O_RDONLY,
	75	GDB_O_RDONLY \| GDB_O_BINARY,
	76	GDB_O_RDWR,
	77	GDB_O_RDWR \| GDB_O_BINARY,
	78	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_TRUNC,
	79	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_TRUNC \| GDB_O_BINARY,
	80	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_TRUNC,
	81	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_TRUNC \| GDB_O_BINARY,
	82	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_APPEND,
	83	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_APPEND \| GDB_O_BINARY,
	84	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_APPEND,
	85	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_APPEND \| GDB_O_BINARY
	86	};
	87
	88	static int open_modeflags[12] = {
a4f81979 FB	89	O_RDONLY,
	90	O_RDONLY \| O_BINARY,
	91	O_RDWR,
	92	O_RDWR \| O_BINARY,
	93	O_WRONLY \| O_CREAT \| O_TRUNC,
	94	O_WRONLY \| O_CREAT \| O_TRUNC \| O_BINARY,
	95	O_RDWR \| O_CREAT \| O_TRUNC,
	96	O_RDWR \| O_CREAT \| O_TRUNC \| O_BINARY,
	97	O_WRONLY \| O_CREAT \| O_APPEND,
	98	O_WRONLY \| O_CREAT \| O_APPEND \| O_BINARY,
	99	O_RDWR \| O_CREAT \| O_APPEND,
	100	O_RDWR \| O_CREAT \| O_APPEND \| O_BINARY
	101	};
	102
8e71621f	103	#ifdef CONFIG_USER_ONLY
a4f81979 FB	104	static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
a4f81979 FB	105	{
8e71621f PB	106	if (code == (uint32_t)-1)
	107	ts->swi_errno = errno;
	108	return code;
	109	}
	110	#else
	111	static inline uint32_t set_swi_errno(CPUState *env, uint32_t code)
	112	{
	113	return code;
	114	}
	115
a87295e8	116	#include "softmmu-semi.h"
8e71621f	117	#endif
a4f81979	118
a2d1ebaf PB	119	static target_ulong arm_semi_syscall_len;
a2d1ebaf PB	120
33d9cc8a PB	121	#if !defined(CONFIG_USER_ONLY)
	122	static target_ulong syscall_err;
	123	#endif
	124
a2d1ebaf PB	125	static void arm_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
	126	{
	127	#ifdef CONFIG_USER_ONLY
	128	TaskState *ts = env->opaque;
	129	#endif
33d9cc8a	130
a2d1ebaf PB	131	if (ret == (target_ulong)-1) {
	132	#ifdef CONFIG_USER_ONLY
	133	ts->swi_errno = err;
33d9cc8a PB	134	#else
33d9cc8a PB	135	syscall_err = err;
a2d1ebaf PB	136	#endif
	137	env->regs[0] = ret;
	138	} else {
	139	/* Fixup syscalls that use nonstardard return conventions. */
	140	switch (env->regs[0]) {
	141	case SYS_WRITE:
	142	case SYS_READ:
	143	env->regs[0] = arm_semi_syscall_len - ret;
	144	break;
	145	case SYS_SEEK:
	146	env->regs[0] = 0;
	147	break;
	148	default:
	149	env->regs[0] = ret;
	150	break;
	151	}
	152	}
	153	}
	154
33d9cc8a PB	155	static void arm_semi_flen_cb(CPUState *env, target_ulong ret, target_ulong err)
	156	{
	157	/* The size is always stored in big-endian order, extract
	158	the value. We assume the size always fit in 32 bits. */
	159	uint32_t size;
	160	cpu_memory_rw_debug(env, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
	161	env->regs[0] = be32_to_cpu(size);
	162	#ifdef CONFIG_USER_ONLY
	163	((TaskState *)env->opaque)->swi_errno = err;
	164	#else
	165	syscall_err = err;
	166	#endif
	167	}
	168
2f619698 FB	169	#define ARG(n) \
	170	({ \
	171	target_ulong __arg; \
	172	/* FIXME - handle get_user() failure */ \
	173	get_user_ual(__arg, args + (n) * 4); \
	174	__arg; \
	175	})
	176	#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
a4f81979 FB	177	uint32_t do_arm_semihosting(CPUState *env)
a4f81979 FB	178	{
53a5960a	179	target_ulong args;
a4f81979 FB	180	char * s;
	181	int nr;
	182	uint32_t ret;
8e71621f PB	183	uint32_t len;
8e71621f PB	184	#ifdef CONFIG_USER_ONLY
a4f81979	185	TaskState *ts = env->opaque;
8e71621f PB	186	#else
	187	CPUState *ts = env;
	188	#endif
a4f81979 FB	189
a4f81979 FB	190	nr = env->regs[0];
53a5960a	191	args = env->regs[1];
a4f81979 FB	192	switch (nr) {
a4f81979 FB	193	case SYS_OPEN:
579a97f7 FB	194	if (!(s = lock_user_string(ARG(0))))
	195	/* FIXME - should this error code be -TARGET_EFAULT ? */
	196	return (uint32_t)-1;
a4f81979	197	if (ARG(1) >= 12)
579a97f7	198	return (uint32_t)-1;
a4f81979 FB	199	if (strcmp(s, ":tt") == 0) {
	200	if (ARG(1) < 4)
	201	return STDIN_FILENO;
	202	else
	203	return STDOUT_FILENO;
	204	}
a2d1ebaf	205	if (use_gdb_syscalls()) {
5fafdf24	206	gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0),
33d9cc8a	207	(int)ARG(2)+1, gdb_open_modeflags[ARG(1)]);
a2d1ebaf PB	208	return env->regs[0];
	209	} else {
	210	ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
	211	}
8e71621f PB	212	unlock_user(s, ARG(0), 0);
8e71621f PB	213	return ret;
a4f81979	214	case SYS_CLOSE:
a2d1ebaf PB	215	if (use_gdb_syscalls()) {
	216	gdb_do_syscall(arm_semi_cb, "close,%x", ARG(0));
	217	return env->regs[0];
	218	} else {
	219	return set_swi_errno(ts, close(ARG(0)));
	220	}
a4f81979	221	case SYS_WRITEC:
53a5960a	222	{
2f619698 FB	223	char c;
	224
	225	if (get_user_u8(c, args))
	226	/* FIXME - should this error code be -TARGET_EFAULT ? */
	227	return (uint32_t)-1;
53a5960a	228	/* Write to debug console. stderr is near enough. */
a2d1ebaf PB	229	if (use_gdb_syscalls()) {
	230	gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
	231	return env->regs[0];
	232	} else {
	233	return write(STDERR_FILENO, &c, 1);
	234	}
53a5960a	235	}
a4f81979	236	case SYS_WRITE0:
579a97f7 FB	237	if (!(s = lock_user_string(args)))
	238	/* FIXME - should this error code be -TARGET_EFAULT ? */
	239	return (uint32_t)-1;
a2d1ebaf PB	240	len = strlen(s);
	241	if (use_gdb_syscalls()) {
	242	gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
	243	ret = env->regs[0];
	244	} else {
	245	ret = write(STDERR_FILENO, s, len);
	246	}
53a5960a PB	247	unlock_user(s, args, 0);
53a5960a PB	248	return ret;
a4f81979	249	case SYS_WRITE:
8e71621f	250	len = ARG(2);
a2d1ebaf PB	251	if (use_gdb_syscalls()) {
	252	arm_semi_syscall_len = len;
	253	gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len);
	254	return env->regs[0];
	255	} else {
579a97f7 FB	256	if (!(s = lock_user(VERIFY_READ, ARG(1), len, 1)))
	257	/* FIXME - should this error code be -TARGET_EFAULT ? */
	258	return (uint32_t)-1;
a2d1ebaf PB	259	ret = set_swi_errno(ts, write(ARG(0), s, len));
	260	unlock_user(s, ARG(1), 0);
	261	if (ret == (uint32_t)-1)
	262	return -1;
	263	return len - ret;
	264	}
a4f81979	265	case SYS_READ:
8e71621f	266	len = ARG(2);
a2d1ebaf PB	267	if (use_gdb_syscalls()) {
	268	arm_semi_syscall_len = len;
	269	gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len);
	270	return env->regs[0];
	271	} else {
579a97f7 FB	272	if (!(s = lock_user(VERIFY_WRITE, ARG(1), len, 0)))
	273	/* FIXME - should this error code be -TARGET_EFAULT ? */
	274	return (uint32_t)-1;
a2d1ebaf PB	275	do
	276	ret = set_swi_errno(ts, read(ARG(0), s, len));
	277	while (ret == -1 && errno == EINTR);
	278	unlock_user(s, ARG(1), len);
	279	if (ret == (uint32_t)-1)
	280	return -1;
	281	return len - ret;
	282	}
a4f81979 FB	283	case SYS_READC:
	284	/* XXX: Read from debug cosole. Not implemented. */
	285	return 0;
	286	case SYS_ISTTY:
a2d1ebaf PB	287	if (use_gdb_syscalls()) {
	288	gdb_do_syscall(arm_semi_cb, "isatty,%x", ARG(0));
	289	return env->regs[0];
	290	} else {
	291	return isatty(ARG(0));
	292	}
a4f81979	293	case SYS_SEEK:
a2d1ebaf	294	if (use_gdb_syscalls()) {
33d9cc8a	295	gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", ARG(0), ARG(1));
a2d1ebaf PB	296	return env->regs[0];
	297	} else {
	298	ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
	299	if (ret == (uint32_t)-1)
	300	return -1;
	301	return 0;
	302	}
a4f81979	303	case SYS_FLEN:
a2d1ebaf	304	if (use_gdb_syscalls()) {
5fafdf24	305	gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
33d9cc8a PB	306	ARG(0), env->regs[13]-64);
33d9cc8a PB	307	return env->regs[0];
a2d1ebaf	308	} else {
a4f81979 FB	309	struct stat buf;
	310	ret = set_swi_errno(ts, fstat(ARG(0), &buf));
	311	if (ret == (uint32_t)-1)
	312	return -1;
	313	return buf.st_size;
	314	}
	315	case SYS_TMPNAM:
	316	/* XXX: Not implemented. */
	317	return -1;
	318	case SYS_REMOVE:
a2d1ebaf	319	if (use_gdb_syscalls()) {
33d9cc8a	320	gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1);
a2d1ebaf PB	321	ret = env->regs[0];
a2d1ebaf PB	322	} else {
579a97f7 FB	323	if (!(s = lock_user_string(ARG(0))))
	324	/* FIXME - should this error code be -TARGET_EFAULT ? */
	325	return (uint32_t)-1;
a2d1ebaf PB	326	ret = set_swi_errno(ts, remove(s));
	327	unlock_user(s, ARG(0), 0);
	328	}
8e71621f	329	return ret;
a4f81979	330	case SYS_RENAME:
a2d1ebaf PB	331	if (use_gdb_syscalls()) {
a2d1ebaf PB	332	gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
33d9cc8a	333	ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1);
a2d1ebaf PB	334	return env->regs[0];
a2d1ebaf PB	335	} else {
8e71621f PB	336	char *s2;
	337	s = lock_user_string(ARG(0));
	338	s2 = lock_user_string(ARG(2));
579a97f7 FB	339	if (!s \|\| !s2)
	340	/* FIXME - should this error code be -TARGET_EFAULT ? */
	341	ret = (uint32_t)-1;
	342	else
	343	ret = set_swi_errno(ts, rename(s, s2));
	344	if (s2)
	345	unlock_user(s2, ARG(2), 0);
	346	if (s)
	347	unlock_user(s, ARG(0), 0);
8e71621f PB	348	return ret;
8e71621f PB	349	}
a4f81979 FB	350	case SYS_CLOCK:
	351	return clock() / (CLOCKS_PER_SEC / 100);
	352	case SYS_TIME:
	353	return set_swi_errno(ts, time(NULL));
	354	case SYS_SYSTEM:
a2d1ebaf	355	if (use_gdb_syscalls()) {
33d9cc8a	356	gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1);
a2d1ebaf PB	357	return env->regs[0];
a2d1ebaf PB	358	} else {
579a97f7 FB	359	if (!(s = lock_user_string(ARG(0))))
	360	/* FIXME - should this error code be -TARGET_EFAULT ? */
	361	return (uint32_t)-1;
a2d1ebaf PB	362	ret = set_swi_errno(ts, system(s));
a2d1ebaf PB	363	unlock_user(s, ARG(0), 0);
a982b531	364	return ret;
a2d1ebaf	365	}
a4f81979	366	case SYS_ERRNO:
8e71621f	367	#ifdef CONFIG_USER_ONLY
a4f81979	368	return ts->swi_errno;
8e71621f	369	#else
33d9cc8a	370	return syscall_err;
8e71621f	371	#endif
a4f81979	372	case SYS_GET_CMDLINE:
38d0662a	373	{
1c1b40c1 CV	374	/* Build a command-line from the original argv.
	375	*
	376	* The inputs are:
	377	* * ARG(0), pointer to a buffer of at least the size
	378	* specified in ARG(1).
	379	* * ARG(1), size of the buffer pointed to by ARG(0) in
	380	* bytes.
	381	*
	382	* The outputs are:
	383	* * ARG(0), pointer to null-terminated string of the
	384	* command line.
	385	* * ARG(1), length of the string pointed to by ARG(0).
	386	*/
579a97f7	387
1c1b40c1 CV	388	char *output_buffer;
	389	size_t input_size = ARG(1);
	390	size_t output_size;
	391	int status = 0;
2e8785ac	392
1c1b40c1 CV	393	/* Compute the size of the output string. */
	394	#if !defined(CONFIG_USER_ONLY)
	395	output_size = strlen(ts->boot_info->kernel_filename)
	396	+ 1 /* Separating space. */
	397	+ strlen(ts->boot_info->kernel_cmdline)
	398	+ 1; /* Terminating null byte. */
	399	#else
	400	unsigned int i;
38d0662a	401
1c1b40c1 CV	402	output_size = ts->info->arg_end - ts->info->arg_start;
1c1b40c1 CV	403	if (!output_size) {
2e8785ac WS	404	/* We special-case the "empty command line" case (argc==0).
2e8785ac WS	405	Just provide the terminating 0. */
1c1b40c1 CV	406	output_size = 1;
	407	}
	408	#endif
38d0662a	409
1c1b40c1 CV	410	if (output_size > input_size) {
	411	/* Not enough space to store command-line arguments. */
	412	return -1;
38d0662a	413	}
38d0662a	414
1c1b40c1 CV	415	/* Adjust the command-line length. */
1c1b40c1 CV	416	SET_ARG(1, output_size - 1);
38d0662a	417
1c1b40c1 CV	418	/* Lock the buffer on the ARM side. */
	419	output_buffer = lock_user(VERIFY_WRITE, ARG(0), output_size, 0);
	420	if (!output_buffer) {
	421	return -1;
	422	}
38d0662a	423
1c1b40c1 CV	424	/* Copy the command-line arguments. */
	425	#if !defined(CONFIG_USER_ONLY)
	426	pstrcpy(output_buffer, output_size, ts->boot_info->kernel_filename);
	427	pstrcat(output_buffer, output_size, " ");
	428	pstrcat(output_buffer, output_size, ts->boot_info->kernel_cmdline);
	429	#else
	430	if (output_size == 1) {
	431	/* Empty command-line. */
	432	output_buffer[0] = '\0';
	433	goto out;
	434	}
2e8785ac	435
1c1b40c1 CV	436	if (copy_from_user(output_buffer, ts->info->arg_start,
	437	output_size)) {
	438	status = -1;
	439	goto out;
2e8785ac WS	440	}
2e8785ac WS	441
1c1b40c1 CV	442	/* Separate arguments by white spaces. */
	443	for (i = 0; i < output_size - 1; i++) {
	444	if (output_buffer[i] == 0) {
	445	output_buffer[i] = ' ';
	446	}
	447	}
	448	out:
	449	#endif
	450	/* Unlock the buffer on the ARM side. */
	451	unlock_user(output_buffer, ARG(0), output_size);
2e8785ac	452
1c1b40c1	453	return status;
38d0662a	454	}
a4f81979 FB	455	case SYS_HEAPINFO:
	456	{
	457	uint32_t *ptr;
	458	uint32_t limit;
	459
8e71621f PB	460	#ifdef CONFIG_USER_ONLY
8e71621f PB	461	/* Some C libraries assume the heap immediately follows .bss, so
a4f81979 FB	462	allocate it using sbrk. */
a4f81979 FB	463	if (!ts->heap_limit) {
206ae74a	464	abi_ulong ret;
a4f81979	465
53a5960a	466	ts->heap_base = do_brk(0);
a4f81979 FB	467	limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
	468	/* Try a big heap, and reduce the size if that fails. */
	469	for (;;) {
53a5960a	470	ret = do_brk(limit);
206ae74a	471	if (ret >= limit) {
a4f81979	472	break;
206ae74a	473	}
a4f81979 FB	474	limit = (ts->heap_base >> 1) + (limit >> 1);
	475	}
	476	ts->heap_limit = limit;
	477	}
3b46e624	478
579a97f7 FB	479	if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
	480	/* FIXME - should this error code be -TARGET_EFAULT ? */
	481	return (uint32_t)-1;
a4f81979 FB	482	ptr[0] = tswap32(ts->heap_base);
	483	ptr[1] = tswap32(ts->heap_limit);
	484	ptr[2] = tswap32(ts->stack_base);
	485	ptr[3] = tswap32(0); /* Stack limit. */
8e71621f PB	486	unlock_user(ptr, ARG(0), 16);
	487	#else
	488	limit = ram_size;
579a97f7 FB	489	if (!(ptr = lock_user(VERIFY_WRITE, ARG(0), 16, 0)))
	490	/* FIXME - should this error code be -TARGET_EFAULT ? */
	491	return (uint32_t)-1;
8e71621f PB	492	/* TODO: Make this use the limit of the loaded application. */
	493	ptr[0] = tswap32(limit / 2);
	494	ptr[1] = tswap32(limit);
	495	ptr[2] = tswap32(limit); /* Stack base */
	496	ptr[3] = tswap32(0); /* Stack limit. */
	497	unlock_user(ptr, ARG(0), 16);
	498	#endif
a4f81979 FB	499	return 0;
	500	}
	501	case SYS_EXIT:
0e1c9c54	502	gdb_exit(env, 0);
a4f81979 FB	503	exit(0);
	504	default:
	505	fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
	506	cpu_dump_state(env, stderr, fprintf, 0);
	507	abort();
	508	}
	509	}