[qemu.git] / target-arm / 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 "exec/gdbstub.h"
#include "hw/arm/arm.h"
#endif

#define TARGET_SYS_OPEN        0x01
#define TARGET_SYS_CLOSE       0x02
#define TARGET_SYS_WRITEC      0x03
#define TARGET_SYS_WRITE0      0x04
#define TARGET_SYS_WRITE       0x05
#define TARGET_SYS_READ        0x06
#define TARGET_SYS_READC       0x07
#define TARGET_SYS_ISTTY       0x09
#define TARGET_SYS_SEEK        0x0a
#define TARGET_SYS_FLEN        0x0c
#define TARGET_SYS_TMPNAM      0x0d
#define TARGET_SYS_REMOVE      0x0e
#define TARGET_SYS_RENAME      0x0f
#define TARGET_SYS_CLOCK       0x10
#define TARGET_SYS_TIME        0x11
#define TARGET_SYS_SYSTEM      0x12
#define TARGET_SYS_ERRNO       0x13
#define TARGET_SYS_GET_CMDLINE 0x15
#define TARGET_SYS_HEAPINFO    0x16
#define TARGET_SYS_EXIT        0x18

/* ADP_Stopped_ApplicationExit is used for exit(0),
 * anything else is implemented as exit(1) */
#define ADP_Stopped_ApplicationExit     (0x20026)

#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(CPUARMState *env, uint32_t code)
{
    return code;
}

#include "exec/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 *cs, target_ulong ret, target_ulong err)
{
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;
#ifdef CONFIG_USER_ONLY
    TaskState *ts = cs->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 TARGET_SYS_WRITE:
        case TARGET_SYS_READ:
            env->regs[0] = arm_semi_syscall_len - ret;
            break;
        case TARGET_SYS_SEEK:
            env->regs[0] = 0;
            break;
        default:
            env->regs[0] = ret;
            break;
        }
    }
}

static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
{
    ARMCPU *cpu = ARM_CPU(cs);
    CPUARMState *env = &cpu->env;
    /* 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(cs, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
    env->regs[0] = be32_to_cpu(size);
#ifdef CONFIG_USER_ONLY
    ((TaskState *)cs->opaque)->swi_errno = err;
#else
    syscall_err = err;
#endif
}

/* 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)) {       \
        return (uint32_t)-1;                            \
    }                                                   \
} while (0)

#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
uint32_t do_arm_semihosting(CPUARMState *env)
{
    ARMCPU *cpu = arm_env_get_cpu(env);
    CPUState *cs = CPU(cpu);
    target_ulong args;
    target_ulong arg0, arg1, arg2, arg3;
    char * s;
    int nr;
    uint32_t ret;
    uint32_t len;
#ifdef CONFIG_USER_ONLY
    TaskState *ts = cs->opaque;
#else
    CPUARMState *ts = env;
#endif

    nr = env->regs[0];
    args = env->regs[1];
    switch (nr) {
    case TARGET_SYS_OPEN:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        s = lock_user_string(arg0);
        if (!s) {
            /* FIXME - should this error code be -TARGET_EFAULT ? */
            return (uint32_t)-1;
        }
        if (arg1 >= 12) {
            unlock_user(s, arg0, 0);
            return (uint32_t)-1;
        }
        if (strcmp(s, ":tt") == 0) {
            int result_fileno = arg1 < 4 ? STDIN_FILENO : STDOUT_FILENO;
            unlock_user(s, arg0, 0);
            return result_fileno;
        }
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", arg0,
                           (int)arg2+1, gdb_open_modeflags[arg1]);
            ret = env->regs[0];
        } else {
            ret = set_swi_errno(ts, open(s, open_modeflags[arg1], 0644));
        }
        unlock_user(s, arg0, 0);
        return ret;
    case TARGET_SYS_CLOSE:
        GET_ARG(0);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "close,%x", arg0);
            return env->regs[0];
        } else {
            return set_swi_errno(ts, close(arg0));
        }
    case TARGET_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 TARGET_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 TARGET_SYS_WRITE:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        len = arg2;
        if (use_gdb_syscalls()) {
            arm_semi_syscall_len = len;
            gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", arg0, arg1, len);
            return env->regs[0];
        } else {
            s = lock_user(VERIFY_READ, arg1, len, 1);
            if (!s) {
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            }
            ret = set_swi_errno(ts, write(arg0, s, len));
            unlock_user(s, arg1, 0);
            if (ret == (uint32_t)-1)
                return -1;
            return len - ret;
        }
    case TARGET_SYS_READ:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        len = arg2;
        if (use_gdb_syscalls()) {
            arm_semi_syscall_len = len;
            gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", arg0, arg1, len);
            return env->regs[0];
        } else {
            s = lock_user(VERIFY_WRITE, arg1, len, 0);
            if (!s) {
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            }
            do {
                ret = set_swi_errno(ts, read(arg0, s, len));
            } while (ret == -1 && errno == EINTR);
            unlock_user(s, arg1, len);
            if (ret == (uint32_t)-1)
                return -1;
            return len - ret;
        }
    case TARGET_SYS_READC:
       /* XXX: Read from debug console. Not implemented.  */
        return 0;
    case TARGET_SYS_ISTTY:
        GET_ARG(0);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "isatty,%x", arg0);
            return env->regs[0];
        } else {
            return isatty(arg0);
        }
    case TARGET_SYS_SEEK:
        GET_ARG(0);
        GET_ARG(1);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", arg0, arg1);
            return env->regs[0];
        } else {
            ret = set_swi_errno(ts, lseek(arg0, arg1, SEEK_SET));
            if (ret == (uint32_t)-1)
              return -1;
            return 0;
        }
    case TARGET_SYS_FLEN:
        GET_ARG(0);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
                           arg0, env->regs[13]-64);
            return env->regs[0];
        } else {
            struct stat buf;
            ret = set_swi_errno(ts, fstat(arg0, &buf));
            if (ret == (uint32_t)-1)
                return -1;
            return buf.st_size;
        }
    case TARGET_SYS_TMPNAM:
        /* XXX: Not implemented.  */
        return -1;
    case TARGET_SYS_REMOVE:
        GET_ARG(0);
        GET_ARG(1);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "unlink,%s", arg0, (int)arg1+1);
            ret = env->regs[0];
        } else {
            s = lock_user_string(arg0);
            if (!s) {
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            }
            ret =  set_swi_errno(ts, remove(s));
            unlock_user(s, arg0, 0);
        }
        return ret;
    case TARGET_SYS_RENAME:
        GET_ARG(0);
        GET_ARG(1);
        GET_ARG(2);
        GET_ARG(3);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
                           arg0, (int)arg1+1, arg2, (int)arg3+1);
            return env->regs[0];
        } else {
            char *s2;
            s = lock_user_string(arg0);
            s2 = lock_user_string(arg2);
            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, arg2, 0);
            if (s)
                unlock_user(s, arg0, 0);
            return ret;
        }
    case TARGET_SYS_CLOCK:
        return clock() / (CLOCKS_PER_SEC / 100);
    case TARGET_SYS_TIME:
        return set_swi_errno(ts, time(NULL));
    case TARGET_SYS_SYSTEM:
        GET_ARG(0);
        GET_ARG(1);
        if (use_gdb_syscalls()) {
            gdb_do_syscall(arm_semi_cb, "system,%s", arg0, (int)arg1+1);
            return env->regs[0];
        } else {
            s = lock_user_string(arg0);
            if (!s) {
                /* FIXME - should this error code be -TARGET_EFAULT ? */
                return (uint32_t)-1;
            }
            ret = set_swi_errno(ts, system(s));
            unlock_user(s, arg0, 0);
            return ret;
        }
    case TARGET_SYS_ERRNO:
#ifdef CONFIG_USER_ONLY
        return ts->swi_errno;
#else
        return syscall_err;
#endif
    case TARGET_SYS_GET_CMDLINE:
        {
            /* Build a command-line from the original argv.
             *
             * The inputs are:
             *     * arg0, pointer to a buffer of at least the size
             *               specified in arg1.
             *     * arg1, size of the buffer pointed to by arg0 in
             *               bytes.
             *
             * The outputs are:
             *     * arg0, pointer to null-terminated string of the
             *               command line.
             *     * arg1, length of the string pointed to by arg0.
             */

            char *output_buffer;
            size_t input_size;
            size_t output_size;
            int status = 0;
            GET_ARG(0);
            GET_ARG(1);
            input_size = arg1;
            /* 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.  */
            if (SET_ARG(1, output_size - 1)) {
                /* Couldn't write back to argument block */
                return -1;
            }

            /* Lock the buffer on the ARM side.  */
            output_buffer = lock_user(VERIFY_WRITE, arg0, 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, arg0, output_size);

            return status;
        }
    case TARGET_SYS_HEAPINFO:
        {
            uint32_t *ptr;
            uint32_t limit;
            GET_ARG(0);

#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;
            }

            ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
            if (!ptr) {
                /* 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, arg0, 16);
#else
            limit = ram_size;
            ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
            if (!ptr) {
                /* 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, arg0, 16);
#endif
            return 0;
        }
    case TARGET_SYS_EXIT:
        /* ARM specifies only Stopped_ApplicationExit as normal
         * exit, everything else is considered an error */
        ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
        gdb_exit(env, ret);
        exit(ret);
    default:
        fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
        cpu_dump_state(cs, 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"
022c62cb	36	#include "exec/gdbstub.h"
bd2be150	37	#include "hw/arm/arm.h"
8e71621f	38	#endif
a4f81979	39
3881725c SW	40	#define TARGET_SYS_OPEN 0x01
	41	#define TARGET_SYS_CLOSE 0x02
	42	#define TARGET_SYS_WRITEC 0x03
	43	#define TARGET_SYS_WRITE0 0x04
	44	#define TARGET_SYS_WRITE 0x05
	45	#define TARGET_SYS_READ 0x06
	46	#define TARGET_SYS_READC 0x07
	47	#define TARGET_SYS_ISTTY 0x09
	48	#define TARGET_SYS_SEEK 0x0a
	49	#define TARGET_SYS_FLEN 0x0c
	50	#define TARGET_SYS_TMPNAM 0x0d
	51	#define TARGET_SYS_REMOVE 0x0e
	52	#define TARGET_SYS_RENAME 0x0f
	53	#define TARGET_SYS_CLOCK 0x10
	54	#define TARGET_SYS_TIME 0x11
	55	#define TARGET_SYS_SYSTEM 0x12
	56	#define TARGET_SYS_ERRNO 0x13
	57	#define TARGET_SYS_GET_CMDLINE 0x15
	58	#define TARGET_SYS_HEAPINFO 0x16
	59	#define TARGET_SYS_EXIT 0x18
a4f81979	60
1ecc3a2d LI	61	/* ADP_Stopped_ApplicationExit is used for exit(0),
	62	* anything else is implemented as exit(1) */
	63	#define ADP_Stopped_ApplicationExit (0x20026)
	64
a4f81979 FB	65	#ifndef O_BINARY
	66	#define O_BINARY 0
	67	#endif
	68
a2d1ebaf PB	69	#define GDB_O_RDONLY 0x000
	70	#define GDB_O_WRONLY 0x001
	71	#define GDB_O_RDWR 0x002
	72	#define GDB_O_APPEND 0x008
	73	#define GDB_O_CREAT 0x200
	74	#define GDB_O_TRUNC 0x400
	75	#define GDB_O_BINARY 0
	76
	77	static int gdb_open_modeflags[12] = {
	78	GDB_O_RDONLY,
	79	GDB_O_RDONLY \| GDB_O_BINARY,
	80	GDB_O_RDWR,
	81	GDB_O_RDWR \| GDB_O_BINARY,
	82	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_TRUNC,
	83	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_TRUNC \| GDB_O_BINARY,
	84	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_TRUNC,
	85	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_TRUNC \| GDB_O_BINARY,
	86	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_APPEND,
	87	GDB_O_WRONLY \| GDB_O_CREAT \| GDB_O_APPEND \| GDB_O_BINARY,
	88	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_APPEND,
	89	GDB_O_RDWR \| GDB_O_CREAT \| GDB_O_APPEND \| GDB_O_BINARY
	90	};
	91
	92	static int open_modeflags[12] = {
a4f81979 FB	93	O_RDONLY,
	94	O_RDONLY \| O_BINARY,
	95	O_RDWR,
	96	O_RDWR \| O_BINARY,
	97	O_WRONLY \| O_CREAT \| O_TRUNC,
	98	O_WRONLY \| O_CREAT \| O_TRUNC \| O_BINARY,
	99	O_RDWR \| O_CREAT \| O_TRUNC,
	100	O_RDWR \| O_CREAT \| O_TRUNC \| O_BINARY,
	101	O_WRONLY \| O_CREAT \| O_APPEND,
	102	O_WRONLY \| O_CREAT \| O_APPEND \| O_BINARY,
	103	O_RDWR \| O_CREAT \| O_APPEND,
	104	O_RDWR \| O_CREAT \| O_APPEND \| O_BINARY
	105	};
	106
8e71621f	107	#ifdef CONFIG_USER_ONLY
a4f81979 FB	108	static inline uint32_t set_swi_errno(TaskState *ts, uint32_t code)
a4f81979 FB	109	{
8e71621f PB	110	if (code == (uint32_t)-1)
	111	ts->swi_errno = errno;
	112	return code;
	113	}
	114	#else
81926f47	115	static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
8e71621f PB	116	{
	117	return code;
	118	}
	119
022c62cb	120	#include "exec/softmmu-semi.h"
8e71621f	121	#endif
a4f81979	122
a2d1ebaf PB	123	static target_ulong arm_semi_syscall_len;
a2d1ebaf PB	124
33d9cc8a PB	125	#if !defined(CONFIG_USER_ONLY)
	126	static target_ulong syscall_err;
	127	#endif
	128
9e0c5422	129	static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
a2d1ebaf	130	{
9e0c5422 AF	131	ARMCPU *cpu = ARM_CPU(cs);
9e0c5422 AF	132	CPUARMState *env = &cpu->env;
a2d1ebaf	133	#ifdef CONFIG_USER_ONLY
0429a971	134	TaskState *ts = cs->opaque;
a2d1ebaf	135	#endif
33d9cc8a	136
a2d1ebaf PB	137	if (ret == (target_ulong)-1) {
	138	#ifdef CONFIG_USER_ONLY
	139	ts->swi_errno = err;
33d9cc8a PB	140	#else
33d9cc8a PB	141	syscall_err = err;
a2d1ebaf PB	142	#endif
	143	env->regs[0] = ret;
	144	} else {
	145	/* Fixup syscalls that use nonstardard return conventions. */
	146	switch (env->regs[0]) {
3881725c SW	147	case TARGET_SYS_WRITE:
3881725c SW	148	case TARGET_SYS_READ:
a2d1ebaf PB	149	env->regs[0] = arm_semi_syscall_len - ret;
a2d1ebaf PB	150	break;
3881725c	151	case TARGET_SYS_SEEK:
a2d1ebaf PB	152	env->regs[0] = 0;
	153	break;
	154	default:
	155	env->regs[0] = ret;
	156	break;
	157	}
	158	}
	159	}
	160
9e0c5422	161	static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
33d9cc8a	162	{
9e0c5422 AF	163	ARMCPU *cpu = ARM_CPU(cs);
9e0c5422 AF	164	CPUARMState *env = &cpu->env;
33d9cc8a PB	165	/* The size is always stored in big-endian order, extract
	166	the value. We assume the size always fit in 32 bits. */
	167	uint32_t size;
f17ec444	168	cpu_memory_rw_debug(cs, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
33d9cc8a PB	169	env->regs[0] = be32_to_cpu(size);
33d9cc8a PB	170	#ifdef CONFIG_USER_ONLY
0429a971	171	((TaskState *)cs->opaque)->swi_errno = err;
33d9cc8a PB	172	#else
	173	syscall_err = err;
	174	#endif
	175	}
	176
f296c0d1 PM	177	/* Read the input value from the argument block; fail the semihosting
	178	* call if the memory read fails.
	179	*/
	180	#define GET_ARG(n) do { \
	181	if (get_user_ual(arg ## n, args + (n) * 4)) { \
	182	return (uint32_t)-1; \
	183	} \
	184	} while (0)
	185
2f619698	186	#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
81926f47	187	uint32_t do_arm_semihosting(CPUARMState *env)
a4f81979	188	{
878096ee	189	ARMCPU *cpu = arm_env_get_cpu(env);
0429a971	190	CPUState *cs = CPU(cpu);
53a5960a	191	target_ulong args;
f296c0d1	192	target_ulong arg0, arg1, arg2, arg3;
a4f81979 FB	193	char * s;
	194	int nr;
	195	uint32_t ret;
8e71621f PB	196	uint32_t len;
8e71621f PB	197	#ifdef CONFIG_USER_ONLY
0429a971	198	TaskState *ts = cs->opaque;
8e71621f	199	#else
81926f47	200	CPUARMState *ts = env;
8e71621f	201	#endif
a4f81979 FB	202
a4f81979 FB	203	nr = env->regs[0];
53a5960a	204	args = env->regs[1];
a4f81979	205	switch (nr) {
3881725c	206	case TARGET_SYS_OPEN:
f296c0d1 PM	207	GET_ARG(0);
	208	GET_ARG(1);
	209	GET_ARG(2);
	210	s = lock_user_string(arg0);
	211	if (!s) {
579a97f7 FB	212	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	213	return (uint32_t)-1;
f296c0d1 PM	214	}
	215	if (arg1 >= 12) {
	216	unlock_user(s, arg0, 0);
579a97f7	217	return (uint32_t)-1;
396bef4b	218	}
a4f81979	219	if (strcmp(s, ":tt") == 0) {
f296c0d1 PM	220	int result_fileno = arg1 < 4 ? STDIN_FILENO : STDOUT_FILENO;
f296c0d1 PM	221	unlock_user(s, arg0, 0);
396bef4b	222	return result_fileno;
a4f81979	223	}
a2d1ebaf	224	if (use_gdb_syscalls()) {
f296c0d1 PM	225	gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", arg0,
f296c0d1 PM	226	(int)arg2+1, gdb_open_modeflags[arg1]);
396bef4b	227	ret = env->regs[0];
a2d1ebaf	228	} else {
f296c0d1	229	ret = set_swi_errno(ts, open(s, open_modeflags[arg1], 0644));
a2d1ebaf	230	}
f296c0d1	231	unlock_user(s, arg0, 0);
8e71621f	232	return ret;
3881725c	233	case TARGET_SYS_CLOSE:
f296c0d1	234	GET_ARG(0);
a2d1ebaf	235	if (use_gdb_syscalls()) {
f296c0d1	236	gdb_do_syscall(arm_semi_cb, "close,%x", arg0);
a2d1ebaf PB	237	return env->regs[0];
a2d1ebaf PB	238	} else {
f296c0d1	239	return set_swi_errno(ts, close(arg0));
a2d1ebaf	240	}
3881725c	241	case TARGET_SYS_WRITEC:
53a5960a	242	{
2f619698 FB	243	char c;
	244
	245	if (get_user_u8(c, args))
	246	/* FIXME - should this error code be -TARGET_EFAULT ? */
	247	return (uint32_t)-1;
53a5960a	248	/* Write to debug console. stderr is near enough. */
a2d1ebaf PB	249	if (use_gdb_syscalls()) {
	250	gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
	251	return env->regs[0];
	252	} else {
	253	return write(STDERR_FILENO, &c, 1);
	254	}
53a5960a	255	}
3881725c	256	case TARGET_SYS_WRITE0:
579a97f7 FB	257	if (!(s = lock_user_string(args)))
	258	/* FIXME - should this error code be -TARGET_EFAULT ? */
	259	return (uint32_t)-1;
a2d1ebaf PB	260	len = strlen(s);
	261	if (use_gdb_syscalls()) {
	262	gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
	263	ret = env->regs[0];
	264	} else {
	265	ret = write(STDERR_FILENO, s, len);
	266	}
53a5960a PB	267	unlock_user(s, args, 0);
53a5960a PB	268	return ret;
3881725c	269	case TARGET_SYS_WRITE:
f296c0d1 PM	270	GET_ARG(0);
	271	GET_ARG(1);
	272	GET_ARG(2);
	273	len = arg2;
a2d1ebaf PB	274	if (use_gdb_syscalls()) {
a2d1ebaf PB	275	arm_semi_syscall_len = len;
f296c0d1	276	gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", arg0, arg1, len);
a2d1ebaf PB	277	return env->regs[0];
a2d1ebaf PB	278	} else {
f296c0d1 PM	279	s = lock_user(VERIFY_READ, arg1, len, 1);
f296c0d1 PM	280	if (!s) {
579a97f7 FB	281	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	282	return (uint32_t)-1;
f296c0d1 PM	283	}
	284	ret = set_swi_errno(ts, write(arg0, s, len));
	285	unlock_user(s, arg1, 0);
a2d1ebaf PB	286	if (ret == (uint32_t)-1)
	287	return -1;
	288	return len - ret;
	289	}
3881725c	290	case TARGET_SYS_READ:
f296c0d1 PM	291	GET_ARG(0);
	292	GET_ARG(1);
	293	GET_ARG(2);
	294	len = arg2;
a2d1ebaf PB	295	if (use_gdb_syscalls()) {
a2d1ebaf PB	296	arm_semi_syscall_len = len;
f296c0d1	297	gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", arg0, arg1, len);
a2d1ebaf PB	298	return env->regs[0];
a2d1ebaf PB	299	} else {
f296c0d1 PM	300	s = lock_user(VERIFY_WRITE, arg1, len, 0);
f296c0d1 PM	301	if (!s) {
579a97f7 FB	302	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	303	return (uint32_t)-1;
f296c0d1 PM	304	}
	305	do {
	306	ret = set_swi_errno(ts, read(arg0, s, len));
	307	} while (ret == -1 && errno == EINTR);
	308	unlock_user(s, arg1, len);
a2d1ebaf PB	309	if (ret == (uint32_t)-1)
	310	return -1;
	311	return len - ret;
	312	}
3881725c	313	case TARGET_SYS_READC:
b90372ad	314	/* XXX: Read from debug console. Not implemented. */
a4f81979	315	return 0;
3881725c	316	case TARGET_SYS_ISTTY:
f296c0d1	317	GET_ARG(0);
a2d1ebaf	318	if (use_gdb_syscalls()) {
f296c0d1	319	gdb_do_syscall(arm_semi_cb, "isatty,%x", arg0);
a2d1ebaf PB	320	return env->regs[0];
a2d1ebaf PB	321	} else {
f296c0d1	322	return isatty(arg0);
a2d1ebaf	323	}
3881725c	324	case TARGET_SYS_SEEK:
f296c0d1 PM	325	GET_ARG(0);
f296c0d1 PM	326	GET_ARG(1);
a2d1ebaf	327	if (use_gdb_syscalls()) {
f296c0d1	328	gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", arg0, arg1);
a2d1ebaf PB	329	return env->regs[0];
a2d1ebaf PB	330	} else {
f296c0d1	331	ret = set_swi_errno(ts, lseek(arg0, arg1, SEEK_SET));
a2d1ebaf PB	332	if (ret == (uint32_t)-1)
	333	return -1;
	334	return 0;
	335	}
3881725c	336	case TARGET_SYS_FLEN:
f296c0d1	337	GET_ARG(0);
a2d1ebaf	338	if (use_gdb_syscalls()) {
5fafdf24	339	gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
f296c0d1	340	arg0, env->regs[13]-64);
33d9cc8a	341	return env->regs[0];
a2d1ebaf	342	} else {
a4f81979	343	struct stat buf;
f296c0d1	344	ret = set_swi_errno(ts, fstat(arg0, &buf));
a4f81979 FB	345	if (ret == (uint32_t)-1)
	346	return -1;
	347	return buf.st_size;
	348	}
3881725c	349	case TARGET_SYS_TMPNAM:
a4f81979 FB	350	/* XXX: Not implemented. */
a4f81979 FB	351	return -1;
3881725c	352	case TARGET_SYS_REMOVE:
f296c0d1 PM	353	GET_ARG(0);
f296c0d1 PM	354	GET_ARG(1);
a2d1ebaf	355	if (use_gdb_syscalls()) {
f296c0d1	356	gdb_do_syscall(arm_semi_cb, "unlink,%s", arg0, (int)arg1+1);
a2d1ebaf PB	357	ret = env->regs[0];
a2d1ebaf PB	358	} else {
f296c0d1 PM	359	s = lock_user_string(arg0);
f296c0d1 PM	360	if (!s) {
579a97f7 FB	361	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	362	return (uint32_t)-1;
f296c0d1	363	}
a2d1ebaf	364	ret = set_swi_errno(ts, remove(s));
f296c0d1	365	unlock_user(s, arg0, 0);
a2d1ebaf	366	}
8e71621f	367	return ret;
3881725c	368	case TARGET_SYS_RENAME:
f296c0d1 PM	369	GET_ARG(0);
	370	GET_ARG(1);
	371	GET_ARG(2);
	372	GET_ARG(3);
a2d1ebaf PB	373	if (use_gdb_syscalls()) {
a2d1ebaf PB	374	gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
f296c0d1	375	arg0, (int)arg1+1, arg2, (int)arg3+1);
a2d1ebaf PB	376	return env->regs[0];
a2d1ebaf PB	377	} else {
8e71621f	378	char *s2;
f296c0d1 PM	379	s = lock_user_string(arg0);
f296c0d1 PM	380	s2 = lock_user_string(arg2);
579a97f7 FB	381	if (!s \|\| !s2)
	382	/* FIXME - should this error code be -TARGET_EFAULT ? */
	383	ret = (uint32_t)-1;
	384	else
	385	ret = set_swi_errno(ts, rename(s, s2));
	386	if (s2)
f296c0d1	387	unlock_user(s2, arg2, 0);
579a97f7	388	if (s)
f296c0d1	389	unlock_user(s, arg0, 0);
8e71621f PB	390	return ret;
8e71621f PB	391	}
3881725c	392	case TARGET_SYS_CLOCK:
a4f81979	393	return clock() / (CLOCKS_PER_SEC / 100);
3881725c	394	case TARGET_SYS_TIME:
a4f81979	395	return set_swi_errno(ts, time(NULL));
3881725c	396	case TARGET_SYS_SYSTEM:
f296c0d1 PM	397	GET_ARG(0);
f296c0d1 PM	398	GET_ARG(1);
a2d1ebaf	399	if (use_gdb_syscalls()) {
f296c0d1	400	gdb_do_syscall(arm_semi_cb, "system,%s", arg0, (int)arg1+1);
a2d1ebaf PB	401	return env->regs[0];
a2d1ebaf PB	402	} else {
f296c0d1 PM	403	s = lock_user_string(arg0);
f296c0d1 PM	404	if (!s) {
579a97f7 FB	405	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	406	return (uint32_t)-1;
f296c0d1	407	}
a2d1ebaf	408	ret = set_swi_errno(ts, system(s));
f296c0d1	409	unlock_user(s, arg0, 0);
a982b531	410	return ret;
a2d1ebaf	411	}
3881725c	412	case TARGET_SYS_ERRNO:
8e71621f	413	#ifdef CONFIG_USER_ONLY
a4f81979	414	return ts->swi_errno;
8e71621f	415	#else
33d9cc8a	416	return syscall_err;
8e71621f	417	#endif
3881725c	418	case TARGET_SYS_GET_CMDLINE:
38d0662a	419	{
1c1b40c1 CV	420	/* Build a command-line from the original argv.
	421	*
	422	* The inputs are:
f296c0d1 PM	423	* * arg0, pointer to a buffer of at least the size
	424	* specified in arg1.
	425	* * arg1, size of the buffer pointed to by arg0 in
1c1b40c1 CV	426	* bytes.
	427	*
	428	* The outputs are:
f296c0d1	429	* * arg0, pointer to null-terminated string of the
1c1b40c1	430	* command line.
f296c0d1	431	* * arg1, length of the string pointed to by arg0.
1c1b40c1	432	*/
579a97f7	433
1c1b40c1	434	char *output_buffer;
f296c0d1	435	size_t input_size;
1c1b40c1 CV	436	size_t output_size;
1c1b40c1 CV	437	int status = 0;
f296c0d1 PM	438	GET_ARG(0);
	439	GET_ARG(1);
	440	input_size = arg1;
1c1b40c1 CV	441	/* Compute the size of the output string. */
	442	#if !defined(CONFIG_USER_ONLY)
	443	output_size = strlen(ts->boot_info->kernel_filename)
	444	+ 1 /* Separating space. */
	445	+ strlen(ts->boot_info->kernel_cmdline)
	446	+ 1; /* Terminating null byte. */
	447	#else
	448	unsigned int i;
38d0662a	449
1c1b40c1 CV	450	output_size = ts->info->arg_end - ts->info->arg_start;
1c1b40c1 CV	451	if (!output_size) {
2e8785ac WS	452	/* We special-case the "empty command line" case (argc==0).
2e8785ac WS	453	Just provide the terminating 0. */
1c1b40c1 CV	454	output_size = 1;
	455	}
	456	#endif
38d0662a	457
1c1b40c1 CV	458	if (output_size > input_size) {
	459	/* Not enough space to store command-line arguments. */
	460	return -1;
38d0662a	461	}
38d0662a	462
1c1b40c1	463	/* Adjust the command-line length. */
f296c0d1 PM	464	if (SET_ARG(1, output_size - 1)) {
	465	/* Couldn't write back to argument block */
	466	return -1;
	467	}
38d0662a	468
1c1b40c1	469	/* Lock the buffer on the ARM side. */
f296c0d1	470	output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
1c1b40c1 CV	471	if (!output_buffer) {
	472	return -1;
	473	}
38d0662a	474
1c1b40c1 CV	475	/* Copy the command-line arguments. */
	476	#if !defined(CONFIG_USER_ONLY)
	477	pstrcpy(output_buffer, output_size, ts->boot_info->kernel_filename);
	478	pstrcat(output_buffer, output_size, " ");
	479	pstrcat(output_buffer, output_size, ts->boot_info->kernel_cmdline);
	480	#else
	481	if (output_size == 1) {
	482	/* Empty command-line. */
	483	output_buffer[0] = '\0';
	484	goto out;
	485	}
2e8785ac	486
1c1b40c1 CV	487	if (copy_from_user(output_buffer, ts->info->arg_start,
	488	output_size)) {
	489	status = -1;
	490	goto out;
2e8785ac WS	491	}
2e8785ac WS	492
1c1b40c1 CV	493	/* Separate arguments by white spaces. */
	494	for (i = 0; i < output_size - 1; i++) {
	495	if (output_buffer[i] == 0) {
	496	output_buffer[i] = ' ';
	497	}
	498	}
	499	out:
	500	#endif
	501	/* Unlock the buffer on the ARM side. */
f296c0d1	502	unlock_user(output_buffer, arg0, output_size);
2e8785ac	503
1c1b40c1	504	return status;
38d0662a	505	}
3881725c	506	case TARGET_SYS_HEAPINFO:
a4f81979 FB	507	{
	508	uint32_t *ptr;
	509	uint32_t limit;
f296c0d1	510	GET_ARG(0);
a4f81979	511
8e71621f PB	512	#ifdef CONFIG_USER_ONLY
8e71621f PB	513	/* Some C libraries assume the heap immediately follows .bss, so
a4f81979 FB	514	allocate it using sbrk. */
a4f81979 FB	515	if (!ts->heap_limit) {
206ae74a	516	abi_ulong ret;
a4f81979	517
53a5960a	518	ts->heap_base = do_brk(0);
a4f81979 FB	519	limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
	520	/* Try a big heap, and reduce the size if that fails. */
	521	for (;;) {
53a5960a	522	ret = do_brk(limit);
206ae74a	523	if (ret >= limit) {
a4f81979	524	break;
206ae74a	525	}
a4f81979 FB	526	limit = (ts->heap_base >> 1) + (limit >> 1);
	527	}
	528	ts->heap_limit = limit;
	529	}
3b46e624	530
f296c0d1 PM	531	ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
f296c0d1 PM	532	if (!ptr) {
579a97f7 FB	533	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	534	return (uint32_t)-1;
f296c0d1	535	}
a4f81979 FB	536	ptr[0] = tswap32(ts->heap_base);
	537	ptr[1] = tswap32(ts->heap_limit);
	538	ptr[2] = tswap32(ts->stack_base);
	539	ptr[3] = tswap32(0); /* Stack limit. */
f296c0d1	540	unlock_user(ptr, arg0, 16);
8e71621f PB	541	#else
8e71621f PB	542	limit = ram_size;
f296c0d1 PM	543	ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
f296c0d1 PM	544	if (!ptr) {
579a97f7 FB	545	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	546	return (uint32_t)-1;
f296c0d1	547	}
8e71621f PB	548	/* TODO: Make this use the limit of the loaded application. */
	549	ptr[0] = tswap32(limit / 2);
	550	ptr[1] = tswap32(limit);
	551	ptr[2] = tswap32(limit); /* Stack base */
	552	ptr[3] = tswap32(0); /* Stack limit. */
f296c0d1	553	unlock_user(ptr, arg0, 16);
8e71621f	554	#endif
a4f81979 FB	555	return 0;
a4f81979 FB	556	}
3881725c	557	case TARGET_SYS_EXIT:
1ecc3a2d LI	558	/* ARM specifies only Stopped_ApplicationExit as normal
	559	* exit, everything else is considered an error */
	560	ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
	561	gdb_exit(env, ret);
	562	exit(ret);
a4f81979 FB	563	default:
a4f81979 FB	564	fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
0429a971	565	cpu_dump_state(cs, stderr, fprintf, 0);
a4f81979 FB	566	abort();
	567	}
	568	}