[mirror_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, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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 "vl.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) tget32(args + (n) * 4)
#define SET_ARG(n, val) tput32(args + (n) * 4,val)
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:
        s = lock_user_string(ARG(0));
        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 = tget8(args);
          /* 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:
        s = lock_user_string(args);
        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 {
            s = lock_user(ARG(1), len, 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 {
            s = lock_user(ARG(1), len, 0);
            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 {
            s = lock_user_string(ARG(0));
            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));
            ret = set_swi_errno(ts, rename(s, s2));
            unlock_user(s2, ARG(2), 0);
            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 {
            s = lock_user_string(ARG(0));
            ret = set_swi_errno(ts, system(s));
            unlock_user(s, ARG(0), 0);
        }
    case SYS_ERRNO:
#ifdef CONFIG_USER_ONLY
        return ts->swi_errno;
#else
        return syscall_err;
#endif
    case SYS_GET_CMDLINE:
#ifdef CONFIG_USER_ONLY
        /* Build a commandline from the original argv.  */
        {
            char **arg = ts->info->host_argv;
            int len = ARG(1);
            /* lock the buffer on the ARM side */
            char *cmdline_buffer = (char*)lock_user(ARG(0), len, 0);

            s = cmdline_buffer;
            while (*arg && len > 2) {
                int n = strlen(*arg);

                if (s != cmdline_buffer) {
                    *(s++) = ' ';
                    len--;
                }
                if (n >= len)
                    n = len - 1;
                memcpy(s, *arg, n);
                s += n;
                len -= n;
                arg++;
            }
            /* Null terminate the string.  */
            *s = 0;
            len = s - cmdline_buffer;

            /* Unlock the buffer on the ARM side.  */
            unlock_user(cmdline_buffer, ARG(0), len);

            /* Adjust the commandline length argument.  */
            SET_ARG(1, len);

            /* Return success if commandline fit into buffer.  */
            return *arg ? -1 : 0;
        }
#else
      return -1;
#endif
    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) {
                long 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 != -1)
                        break;
                    limit = (ts->heap_base >> 1) + (limit >> 1);
                }
                ts->heap_limit = limit;
            }
             
            ptr = lock_user(ARG(0), 16, 0);
            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;
            ptr = lock_user(ARG(0), 16, 0);
            /* 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:
        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
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include <sys/types.h>
	23	#include <sys/stat.h>
	24	#include <fcntl.h>
	25	#include <unistd.h>
	26	#include <stdlib.h>
	27	#include <stdio.h>
	28	#include <time.h>
	29
8e71621f PB	30	#include "cpu.h"
8e71621f PB	31	#ifdef CONFIG_USER_ONLY
a4f81979 FB	32	#include "qemu.h"
	33
	34	#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
8e71621f PB	35	#else
	36	#include "vl.h"
	37	#endif
a4f81979 FB	38
	39	#define SYS_OPEN 0x01
	40	#define SYS_CLOSE 0x02
	41	#define SYS_WRITEC 0x03
	42	#define SYS_WRITE0 0x04
	43	#define SYS_WRITE 0x05
	44	#define SYS_READ 0x06
	45	#define SYS_READC 0x07
	46	#define SYS_ISTTY 0x09
	47	#define SYS_SEEK 0x0a
	48	#define SYS_FLEN 0x0c
	49	#define SYS_TMPNAM 0x0d
	50	#define SYS_REMOVE 0x0e
	51	#define SYS_RENAME 0x0f
	52	#define SYS_CLOCK 0x10
	53	#define SYS_TIME 0x11
	54	#define SYS_SYSTEM 0x12
	55	#define SYS_ERRNO 0x13
	56	#define SYS_GET_CMDLINE 0x15
	57	#define SYS_HEAPINFO 0x16
	58	#define SYS_EXIT 0x18
	59
	60	#ifndef O_BINARY
	61	#define O_BINARY 0
	62	#endif
	63
a2d1ebaf PB	64	#define GDB_O_RDONLY 0x000
	65	#define GDB_O_WRONLY 0x001
	66	#define GDB_O_RDWR 0x002
	67	#define GDB_O_APPEND 0x008
	68	#define GDB_O_CREAT 0x200
	69	#define GDB_O_TRUNC 0x400
	70	#define GDB_O_BINARY 0
	71
	72	static int gdb_open_modeflags[12] = {
	73	GDB_O_RDONLY,
	74	GDB_O_RDONLY \| GDB_O_BINARY,
	75	GDB_O_RDWR,
	76	GDB_O_RDWR \| GDB_O_BINARY,
	77	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_TRUNC,
	78	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_TRUNC \| GDB_O_BINARY,
	79	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_TRUNC,
	80	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_TRUNC \| GDB_O_BINARY,
	81	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_APPEND,
	82	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_APPEND \| GDB_O_BINARY,
	83	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_APPEND,
	84	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_APPEND \| GDB_O_BINARY
	85	};
	86
	87	static int open_modeflags[12] = {
a4f81979 FB	88	O_RDONLY,
	89	O_RDONLY \| O_BINARY,
	90	O_RDWR,
	91	O_RDWR \| O_BINARY,
	92	O_WRONLY \| O_CREAT \| O_TRUNC,
	93	O_WRONLY \| O_CREAT \| O_TRUNC \| O_BINARY,
	94	O_RDWR \| O_CREAT \| O_TRUNC,
	95	O_RDWR \| O_CREAT \| O_TRUNC \| O_BINARY,
	96	O_WRONLY \| O_CREAT \| O_APPEND,
	97	O_WRONLY \| O_CREAT \| O_APPEND \| O_BINARY,
	98	O_RDWR \| O_CREAT \| O_APPEND,
	99	O_RDWR \| O_CREAT \| O_APPEND \| O_BINARY
	100	};
	101
8e71621f	102	#ifdef CONFIG_USER_ONLY
a4f81979 FB	103	static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
a4f81979 FB	104	{
8e71621f PB	105	if (code == (uint32_t)-1)
	106	ts->swi_errno = errno;
	107	return code;
	108	}
	109	#else
	110	static inline uint32_t set_swi_errno(CPUState *env, uint32_t code)
	111	{
	112	return code;
	113	}
	114
a87295e8	115	#include "softmmu-semi.h"
8e71621f	116	#endif
a4f81979	117
a2d1ebaf PB	118	static target_ulong arm_semi_syscall_len;
a2d1ebaf PB	119
33d9cc8a PB	120	#if !defined(CONFIG_USER_ONLY)
	121	static target_ulong syscall_err;
	122	#endif
	123
a2d1ebaf PB	124	static void arm_semi_cb(CPUState *env, target_ulong ret, target_ulong err)
	125	{
	126	#ifdef CONFIG_USER_ONLY
	127	TaskState *ts = env->opaque;
	128	#endif
33d9cc8a	129
a2d1ebaf PB	130	if (ret == (target_ulong)-1) {
	131	#ifdef CONFIG_USER_ONLY
	132	ts->swi_errno = err;
33d9cc8a PB	133	#else
33d9cc8a PB	134	syscall_err = err;
a2d1ebaf PB	135	#endif
	136	env->regs[0] = ret;
	137	} else {
	138	/* Fixup syscalls that use nonstardard return conventions. */
	139	switch (env->regs[0]) {
	140	case SYS_WRITE:
	141	case SYS_READ:
	142	env->regs[0] = arm_semi_syscall_len - ret;
	143	break;
	144	case SYS_SEEK:
	145	env->regs[0] = 0;
	146	break;
	147	default:
	148	env->regs[0] = ret;
	149	break;
	150	}
	151	}
	152	}
	153
33d9cc8a PB	154	static void arm_semi_flen_cb(CPUState *env, target_ulong ret, target_ulong err)
	155	{
	156	/* The size is always stored in big-endian order, extract
	157	the value. We assume the size always fit in 32 bits. */
	158	uint32_t size;
	159	cpu_memory_rw_debug(env, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
	160	env->regs[0] = be32_to_cpu(size);
	161	#ifdef CONFIG_USER_ONLY
	162	((TaskState *)env->opaque)->swi_errno = err;
	163	#else
	164	syscall_err = err;
	165	#endif
	166	}
	167
38d0662a PB	168	#define ARG(n) tget32(args + (n) * 4)
38d0662a PB	169	#define SET_ARG(n, val) tput32(args + (n) * 4,val)
a4f81979 FB	170	uint32_t do_arm_semihosting(CPUState *env)
a4f81979 FB	171	{
53a5960a	172	target_ulong args;
a4f81979 FB	173	char * s;
	174	int nr;
	175	uint32_t ret;
8e71621f PB	176	uint32_t len;
8e71621f PB	177	#ifdef CONFIG_USER_ONLY
a4f81979	178	TaskState *ts = env->opaque;
8e71621f PB	179	#else
	180	CPUState *ts = env;
	181	#endif
a4f81979 FB	182
a4f81979 FB	183	nr = env->regs[0];
53a5960a	184	args = env->regs[1];
a4f81979 FB	185	switch (nr) {
a4f81979 FB	186	case SYS_OPEN:
8e71621f	187	s = lock_user_string(ARG(0));
a4f81979 FB	188	if (ARG(1) >= 12)
	189	return (uint32_t)-1;
	190	if (strcmp(s, ":tt") == 0) {
	191	if (ARG(1) < 4)
	192	return STDIN_FILENO;
	193	else
	194	return STDOUT_FILENO;
	195	}
a2d1ebaf	196	if (use_gdb_syscalls()) {
5fafdf24	197	gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", ARG(0),
33d9cc8a	198	(int)ARG(2)+1, gdb_open_modeflags[ARG(1)]);
a2d1ebaf PB	199	return env->regs[0];
	200	} else {
	201	ret = set_swi_errno(ts, open(s, open_modeflags[ARG(1)], 0644));
	202	}
8e71621f PB	203	unlock_user(s, ARG(0), 0);
8e71621f PB	204	return ret;
a4f81979	205	case SYS_CLOSE:
a2d1ebaf PB	206	if (use_gdb_syscalls()) {
	207	gdb_do_syscall(arm_semi_cb, "close,%x", ARG(0));
	208	return env->regs[0];
	209	} else {
	210	return set_swi_errno(ts, close(ARG(0)));
	211	}
a4f81979	212	case SYS_WRITEC:
53a5960a PB	213	{
	214	char c = tget8(args);
	215	/* Write to debug console. stderr is near enough. */
a2d1ebaf PB	216	if (use_gdb_syscalls()) {
	217	gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
	218	return env->regs[0];
	219	} else {
	220	return write(STDERR_FILENO, &c, 1);
	221	}
53a5960a	222	}
a4f81979	223	case SYS_WRITE0:
53a5960a	224	s = lock_user_string(args);
a2d1ebaf PB	225	len = strlen(s);
	226	if (use_gdb_syscalls()) {
	227	gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
	228	ret = env->regs[0];
	229	} else {
	230	ret = write(STDERR_FILENO, s, len);
	231	}
53a5960a PB	232	unlock_user(s, args, 0);
53a5960a PB	233	return ret;
a4f81979	234	case SYS_WRITE:
8e71621f	235	len = ARG(2);
a2d1ebaf PB	236	if (use_gdb_syscalls()) {
	237	arm_semi_syscall_len = len;
	238	gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", ARG(0), ARG(1), len);
	239	return env->regs[0];
	240	} else {
	241	s = lock_user(ARG(1), len, 1);
	242	ret = set_swi_errno(ts, write(ARG(0), s, len));
	243	unlock_user(s, ARG(1), 0);
	244	if (ret == (uint32_t)-1)
	245	return -1;
	246	return len - ret;
	247	}
a4f81979	248	case SYS_READ:
8e71621f	249	len = ARG(2);
a2d1ebaf PB	250	if (use_gdb_syscalls()) {
	251	arm_semi_syscall_len = len;
	252	gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", ARG(0), ARG(1), len);
	253	return env->regs[0];
	254	} else {
	255	s = lock_user(ARG(1), len, 0);
	256	do
	257	ret = set_swi_errno(ts, read(ARG(0), s, len));
	258	while (ret == -1 && errno == EINTR);
	259	unlock_user(s, ARG(1), len);
	260	if (ret == (uint32_t)-1)
	261	return -1;
	262	return len - ret;
	263	}
a4f81979 FB	264	case SYS_READC:
	265	/* XXX: Read from debug cosole. Not implemented. */
	266	return 0;
	267	case SYS_ISTTY:
a2d1ebaf PB	268	if (use_gdb_syscalls()) {
	269	gdb_do_syscall(arm_semi_cb, "isatty,%x", ARG(0));
	270	return env->regs[0];
	271	} else {
	272	return isatty(ARG(0));
	273	}
a4f81979	274	case SYS_SEEK:
a2d1ebaf	275	if (use_gdb_syscalls()) {
33d9cc8a	276	gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", ARG(0), ARG(1));
a2d1ebaf PB	277	return env->regs[0];
	278	} else {
	279	ret = set_swi_errno(ts, lseek(ARG(0), ARG(1), SEEK_SET));
	280	if (ret == (uint32_t)-1)
	281	return -1;
	282	return 0;
	283	}
a4f81979	284	case SYS_FLEN:
a2d1ebaf	285	if (use_gdb_syscalls()) {
5fafdf24	286	gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
33d9cc8a PB	287	ARG(0), env->regs[13]-64);
33d9cc8a PB	288	return env->regs[0];
a2d1ebaf	289	} else {
a4f81979 FB	290	struct stat buf;
	291	ret = set_swi_errno(ts, fstat(ARG(0), &buf));
	292	if (ret == (uint32_t)-1)
	293	return -1;
	294	return buf.st_size;
	295	}
	296	case SYS_TMPNAM:
	297	/* XXX: Not implemented. */
	298	return -1;
	299	case SYS_REMOVE:
a2d1ebaf	300	if (use_gdb_syscalls()) {
33d9cc8a	301	gdb_do_syscall(arm_semi_cb, "unlink,%s", ARG(0), (int)ARG(1)+1);
a2d1ebaf PB	302	ret = env->regs[0];
	303	} else {
	304	s = lock_user_string(ARG(0));
	305	ret = set_swi_errno(ts, remove(s));
	306	unlock_user(s, ARG(0), 0);
	307	}
8e71621f	308	return ret;
a4f81979	309	case SYS_RENAME:
a2d1ebaf PB	310	if (use_gdb_syscalls()) {
a2d1ebaf PB	311	gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
33d9cc8a	312	ARG(0), (int)ARG(1)+1, ARG(2), (int)ARG(3)+1);
a2d1ebaf PB	313	return env->regs[0];
a2d1ebaf PB	314	} else {
8e71621f PB	315	char *s2;
	316	s = lock_user_string(ARG(0));
	317	s2 = lock_user_string(ARG(2));
	318	ret = set_swi_errno(ts, rename(s, s2));
	319	unlock_user(s2, ARG(2), 0);
	320	unlock_user(s, ARG(0), 0);
	321	return ret;
	322	}
a4f81979 FB	323	case SYS_CLOCK:
	324	return clock() / (CLOCKS_PER_SEC / 100);
	325	case SYS_TIME:
	326	return set_swi_errno(ts, time(NULL));
	327	case SYS_SYSTEM:
a2d1ebaf	328	if (use_gdb_syscalls()) {
33d9cc8a	329	gdb_do_syscall(arm_semi_cb, "system,%s", ARG(0), (int)ARG(1)+1);
a2d1ebaf PB	330	return env->regs[0];
	331	} else {
	332	s = lock_user_string(ARG(0));
	333	ret = set_swi_errno(ts, system(s));
	334	unlock_user(s, ARG(0), 0);
	335	}
a4f81979	336	case SYS_ERRNO:
8e71621f	337	#ifdef CONFIG_USER_ONLY
a4f81979	338	return ts->swi_errno;
8e71621f	339	#else
33d9cc8a	340	return syscall_err;
8e71621f	341	#endif
a4f81979	342	case SYS_GET_CMDLINE:
8e71621f	343	#ifdef CONFIG_USER_ONLY
38d0662a PB	344	/* Build a commandline from the original argv. */
	345	{
	346	char **arg = ts->info->host_argv;
	347	int len = ARG(1);
	348	/* lock the buffer on the ARM side */
	349	char cmdline_buffer = (char)lock_user(ARG(0), len, 0);
	350
	351	s = cmdline_buffer;
	352	while (*arg && len > 2) {
	353	int n = strlen(*arg);
	354
	355	if (s != cmdline_buffer) {
	356	*(s++) = ' ';
	357	len--;
	358	}
	359	if (n >= len)
	360	n = len - 1;
	361	memcpy(s, *arg, n);
	362	s += n;
	363	len -= n;
	364	arg++;
	365	}
	366	/* Null terminate the string. */
	367	*s = 0;
	368	len = s - cmdline_buffer;
	369
	370	/* Unlock the buffer on the ARM side. */
	371	unlock_user(cmdline_buffer, ARG(0), len);
	372
	373	/* Adjust the commandline length argument. */
	374	SET_ARG(1, len);
	375
	376	/* Return success if commandline fit into buffer. */
	377	return *arg ? -1 : 0;
	378	}
8e71621f PB	379	#else
	380	return -1;
	381	#endif
a4f81979 FB	382	case SYS_HEAPINFO:
	383	{
	384	uint32_t *ptr;
	385	uint32_t limit;
	386
8e71621f PB	387	#ifdef CONFIG_USER_ONLY
8e71621f PB	388	/* Some C libraries assume the heap immediately follows .bss, so
a4f81979 FB	389	allocate it using sbrk. */
	390	if (!ts->heap_limit) {
	391	long ret;
	392
53a5960a	393	ts->heap_base = do_brk(0);
a4f81979 FB	394	limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
	395	/* Try a big heap, and reduce the size if that fails. */
	396	for (;;) {
53a5960a	397	ret = do_brk(limit);
a4f81979 FB	398	if (ret != -1)
	399	break;
	400	limit = (ts->heap_base >> 1) + (limit >> 1);
	401	}
	402	ts->heap_limit = limit;
	403	}
5fafdf24	404
8e71621f	405	ptr = lock_user(ARG(0), 16, 0);
a4f81979 FB	406	ptr[0] = tswap32(ts->heap_base);
	407	ptr[1] = tswap32(ts->heap_limit);
	408	ptr[2] = tswap32(ts->stack_base);
	409	ptr[3] = tswap32(0); /* Stack limit. */
8e71621f PB	410	unlock_user(ptr, ARG(0), 16);
	411	#else
	412	limit = ram_size;
	413	ptr = lock_user(ARG(0), 16, 0);
	414	/* TODO: Make this use the limit of the loaded application. */
	415	ptr[0] = tswap32(limit / 2);
	416	ptr[1] = tswap32(limit);
	417	ptr[2] = tswap32(limit); /* Stack base */
	418	ptr[3] = tswap32(0); /* Stack limit. */
	419	unlock_user(ptr, ARG(0), 16);
	420	#endif
a4f81979 FB	421	return 0;
	422	}
	423	case SYS_EXIT:
	424	exit(0);
	425	default:
	426	fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
	427	cpu_dump_state(env, stderr, fprintf, 0);
	428	abort();
	429	}
	430	}