[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

#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 = 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 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 *)env->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);
    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 = env->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:
        gdb_exit(env, 0);
        exit(0);
    default:
        fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
        cpu_dump_state(CPU(cpu), 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 FB	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
81926f47	111	static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
8e71621f PB	112	{
	113	return code;
	114	}
	115
022c62cb	116	#include "exec/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
9e0c5422	125	static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
a2d1ebaf	126	{
9e0c5422 AF	127	ARMCPU *cpu = ARM_CPU(cs);
9e0c5422 AF	128	CPUARMState *env = &cpu->env;
a2d1ebaf PB	129	#ifdef CONFIG_USER_ONLY
	130	TaskState *ts = env->opaque;
	131	#endif
33d9cc8a	132
a2d1ebaf PB	133	if (ret == (target_ulong)-1) {
	134	#ifdef CONFIG_USER_ONLY
	135	ts->swi_errno = err;
33d9cc8a PB	136	#else
33d9cc8a PB	137	syscall_err = err;
a2d1ebaf PB	138	#endif
	139	env->regs[0] = ret;
	140	} else {
	141	/* Fixup syscalls that use nonstardard return conventions. */
	142	switch (env->regs[0]) {
3881725c SW	143	case TARGET_SYS_WRITE:
3881725c SW	144	case TARGET_SYS_READ:
a2d1ebaf PB	145	env->regs[0] = arm_semi_syscall_len - ret;
a2d1ebaf PB	146	break;
3881725c	147	case TARGET_SYS_SEEK:
a2d1ebaf PB	148	env->regs[0] = 0;
	149	break;
	150	default:
	151	env->regs[0] = ret;
	152	break;
	153	}
	154	}
	155	}
	156
9e0c5422	157	static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
33d9cc8a	158	{
9e0c5422 AF	159	ARMCPU *cpu = ARM_CPU(cs);
9e0c5422 AF	160	CPUARMState *env = &cpu->env;
33d9cc8a PB	161	/* The size is always stored in big-endian order, extract
	162	the value. We assume the size always fit in 32 bits. */
	163	uint32_t size;
f17ec444	164	cpu_memory_rw_debug(cs, env->regs[13]-64+32, (uint8_t *)&size, 4, 0);
33d9cc8a PB	165	env->regs[0] = be32_to_cpu(size);
	166	#ifdef CONFIG_USER_ONLY
	167	((TaskState *)env->opaque)->swi_errno = err;
	168	#else
	169	syscall_err = err;
	170	#endif
	171	}
	172
f296c0d1 PM	173	/* Read the input value from the argument block; fail the semihosting
	174	* call if the memory read fails.
	175	*/
	176	#define GET_ARG(n) do { \
	177	if (get_user_ual(arg ## n, args + (n) * 4)) { \
	178	return (uint32_t)-1; \
	179	} \
	180	} while (0)
	181
2f619698	182	#define SET_ARG(n, val) put_user_ual(val, args + (n) * 4)
81926f47	183	uint32_t do_arm_semihosting(CPUARMState *env)
a4f81979	184	{
878096ee	185	ARMCPU *cpu = arm_env_get_cpu(env);
53a5960a	186	target_ulong args;
f296c0d1	187	target_ulong arg0, arg1, arg2, arg3;
a4f81979 FB	188	char * s;
	189	int nr;
	190	uint32_t ret;
8e71621f PB	191	uint32_t len;
8e71621f PB	192	#ifdef CONFIG_USER_ONLY
a4f81979	193	TaskState *ts = env->opaque;
8e71621f	194	#else
81926f47	195	CPUARMState *ts = env;
8e71621f	196	#endif
a4f81979 FB	197
a4f81979 FB	198	nr = env->regs[0];
53a5960a	199	args = env->regs[1];
a4f81979	200	switch (nr) {
3881725c	201	case TARGET_SYS_OPEN:
f296c0d1 PM	202	GET_ARG(0);
	203	GET_ARG(1);
	204	GET_ARG(2);
	205	s = lock_user_string(arg0);
	206	if (!s) {
579a97f7 FB	207	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	208	return (uint32_t)-1;
f296c0d1 PM	209	}
	210	if (arg1 >= 12) {
	211	unlock_user(s, arg0, 0);
579a97f7	212	return (uint32_t)-1;
396bef4b	213	}
a4f81979	214	if (strcmp(s, ":tt") == 0) {
f296c0d1 PM	215	int result_fileno = arg1 < 4 ? STDIN_FILENO : STDOUT_FILENO;
f296c0d1 PM	216	unlock_user(s, arg0, 0);
396bef4b	217	return result_fileno;
a4f81979	218	}
a2d1ebaf	219	if (use_gdb_syscalls()) {
f296c0d1 PM	220	gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", arg0,
f296c0d1 PM	221	(int)arg2+1, gdb_open_modeflags[arg1]);
396bef4b	222	ret = env->regs[0];
a2d1ebaf	223	} else {
f296c0d1	224	ret = set_swi_errno(ts, open(s, open_modeflags[arg1], 0644));
a2d1ebaf	225	}
f296c0d1	226	unlock_user(s, arg0, 0);
8e71621f	227	return ret;
3881725c	228	case TARGET_SYS_CLOSE:
f296c0d1	229	GET_ARG(0);
a2d1ebaf	230	if (use_gdb_syscalls()) {
f296c0d1	231	gdb_do_syscall(arm_semi_cb, "close,%x", arg0);
a2d1ebaf PB	232	return env->regs[0];
a2d1ebaf PB	233	} else {
f296c0d1	234	return set_swi_errno(ts, close(arg0));
a2d1ebaf	235	}
3881725c	236	case TARGET_SYS_WRITEC:
53a5960a	237	{
2f619698 FB	238	char c;
	239
	240	if (get_user_u8(c, args))
	241	/* FIXME - should this error code be -TARGET_EFAULT ? */
	242	return (uint32_t)-1;
53a5960a	243	/* Write to debug console. stderr is near enough. */
a2d1ebaf PB	244	if (use_gdb_syscalls()) {
	245	gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
	246	return env->regs[0];
	247	} else {
	248	return write(STDERR_FILENO, &c, 1);
	249	}
53a5960a	250	}
3881725c	251	case TARGET_SYS_WRITE0:
579a97f7 FB	252	if (!(s = lock_user_string(args)))
	253	/* FIXME - should this error code be -TARGET_EFAULT ? */
	254	return (uint32_t)-1;
a2d1ebaf PB	255	len = strlen(s);
	256	if (use_gdb_syscalls()) {
	257	gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
	258	ret = env->regs[0];
	259	} else {
	260	ret = write(STDERR_FILENO, s, len);
	261	}
53a5960a PB	262	unlock_user(s, args, 0);
53a5960a PB	263	return ret;
3881725c	264	case TARGET_SYS_WRITE:
f296c0d1 PM	265	GET_ARG(0);
	266	GET_ARG(1);
	267	GET_ARG(2);
	268	len = arg2;
a2d1ebaf PB	269	if (use_gdb_syscalls()) {
a2d1ebaf PB	270	arm_semi_syscall_len = len;
f296c0d1	271	gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", arg0, arg1, len);
a2d1ebaf PB	272	return env->regs[0];
a2d1ebaf PB	273	} else {
f296c0d1 PM	274	s = lock_user(VERIFY_READ, arg1, len, 1);
f296c0d1 PM	275	if (!s) {
579a97f7 FB	276	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	277	return (uint32_t)-1;
f296c0d1 PM	278	}
	279	ret = set_swi_errno(ts, write(arg0, s, len));
	280	unlock_user(s, arg1, 0);
a2d1ebaf PB	281	if (ret == (uint32_t)-1)
	282	return -1;
	283	return len - ret;
	284	}
3881725c	285	case TARGET_SYS_READ:
f296c0d1 PM	286	GET_ARG(0);
	287	GET_ARG(1);
	288	GET_ARG(2);
	289	len = arg2;
a2d1ebaf PB	290	if (use_gdb_syscalls()) {
a2d1ebaf PB	291	arm_semi_syscall_len = len;
f296c0d1	292	gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", arg0, arg1, len);
a2d1ebaf PB	293	return env->regs[0];
a2d1ebaf PB	294	} else {
f296c0d1 PM	295	s = lock_user(VERIFY_WRITE, arg1, len, 0);
f296c0d1 PM	296	if (!s) {
579a97f7 FB	297	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	298	return (uint32_t)-1;
f296c0d1 PM	299	}
	300	do {
	301	ret = set_swi_errno(ts, read(arg0, s, len));
	302	} while (ret == -1 && errno == EINTR);
	303	unlock_user(s, arg1, len);
a2d1ebaf PB	304	if (ret == (uint32_t)-1)
	305	return -1;
	306	return len - ret;
	307	}
3881725c	308	case TARGET_SYS_READC:
b90372ad	309	/* XXX: Read from debug console. Not implemented. */
a4f81979	310	return 0;
3881725c	311	case TARGET_SYS_ISTTY:
f296c0d1	312	GET_ARG(0);
a2d1ebaf	313	if (use_gdb_syscalls()) {
f296c0d1	314	gdb_do_syscall(arm_semi_cb, "isatty,%x", arg0);
a2d1ebaf PB	315	return env->regs[0];
a2d1ebaf PB	316	} else {
f296c0d1	317	return isatty(arg0);
a2d1ebaf	318	}
3881725c	319	case TARGET_SYS_SEEK:
f296c0d1 PM	320	GET_ARG(0);
f296c0d1 PM	321	GET_ARG(1);
a2d1ebaf	322	if (use_gdb_syscalls()) {
f296c0d1	323	gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", arg0, arg1);
a2d1ebaf PB	324	return env->regs[0];
a2d1ebaf PB	325	} else {
f296c0d1	326	ret = set_swi_errno(ts, lseek(arg0, arg1, SEEK_SET));
a2d1ebaf PB	327	if (ret == (uint32_t)-1)
	328	return -1;
	329	return 0;
	330	}
3881725c	331	case TARGET_SYS_FLEN:
f296c0d1	332	GET_ARG(0);
a2d1ebaf	333	if (use_gdb_syscalls()) {
5fafdf24	334	gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
f296c0d1	335	arg0, env->regs[13]-64);
33d9cc8a	336	return env->regs[0];
a2d1ebaf	337	} else {
a4f81979	338	struct stat buf;
f296c0d1	339	ret = set_swi_errno(ts, fstat(arg0, &buf));
a4f81979 FB	340	if (ret == (uint32_t)-1)
	341	return -1;
	342	return buf.st_size;
	343	}
3881725c	344	case TARGET_SYS_TMPNAM:
a4f81979 FB	345	/* XXX: Not implemented. */
a4f81979 FB	346	return -1;
3881725c	347	case TARGET_SYS_REMOVE:
f296c0d1 PM	348	GET_ARG(0);
f296c0d1 PM	349	GET_ARG(1);
a2d1ebaf	350	if (use_gdb_syscalls()) {
f296c0d1	351	gdb_do_syscall(arm_semi_cb, "unlink,%s", arg0, (int)arg1+1);
a2d1ebaf PB	352	ret = env->regs[0];
a2d1ebaf PB	353	} else {
f296c0d1 PM	354	s = lock_user_string(arg0);
f296c0d1 PM	355	if (!s) {
579a97f7 FB	356	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	357	return (uint32_t)-1;
f296c0d1	358	}
a2d1ebaf	359	ret = set_swi_errno(ts, remove(s));
f296c0d1	360	unlock_user(s, arg0, 0);
a2d1ebaf	361	}
8e71621f	362	return ret;
3881725c	363	case TARGET_SYS_RENAME:
f296c0d1 PM	364	GET_ARG(0);
	365	GET_ARG(1);
	366	GET_ARG(2);
	367	GET_ARG(3);
a2d1ebaf PB	368	if (use_gdb_syscalls()) {
a2d1ebaf PB	369	gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
f296c0d1	370	arg0, (int)arg1+1, arg2, (int)arg3+1);
a2d1ebaf PB	371	return env->regs[0];
a2d1ebaf PB	372	} else {
8e71621f	373	char *s2;
f296c0d1 PM	374	s = lock_user_string(arg0);
f296c0d1 PM	375	s2 = lock_user_string(arg2);
579a97f7 FB	376	if (!s \|\| !s2)
	377	/* FIXME - should this error code be -TARGET_EFAULT ? */
	378	ret = (uint32_t)-1;
	379	else
	380	ret = set_swi_errno(ts, rename(s, s2));
	381	if (s2)
f296c0d1	382	unlock_user(s2, arg2, 0);
579a97f7	383	if (s)
f296c0d1	384	unlock_user(s, arg0, 0);
8e71621f PB	385	return ret;
8e71621f PB	386	}
3881725c	387	case TARGET_SYS_CLOCK:
a4f81979	388	return clock() / (CLOCKS_PER_SEC / 100);
3881725c	389	case TARGET_SYS_TIME:
a4f81979	390	return set_swi_errno(ts, time(NULL));
3881725c	391	case TARGET_SYS_SYSTEM:
f296c0d1 PM	392	GET_ARG(0);
f296c0d1 PM	393	GET_ARG(1);
a2d1ebaf	394	if (use_gdb_syscalls()) {
f296c0d1	395	gdb_do_syscall(arm_semi_cb, "system,%s", arg0, (int)arg1+1);
a2d1ebaf PB	396	return env->regs[0];
a2d1ebaf PB	397	} else {
f296c0d1 PM	398	s = lock_user_string(arg0);
f296c0d1 PM	399	if (!s) {
579a97f7 FB	400	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	401	return (uint32_t)-1;
f296c0d1	402	}
a2d1ebaf	403	ret = set_swi_errno(ts, system(s));
f296c0d1	404	unlock_user(s, arg0, 0);
a982b531	405	return ret;
a2d1ebaf	406	}
3881725c	407	case TARGET_SYS_ERRNO:
8e71621f	408	#ifdef CONFIG_USER_ONLY
a4f81979	409	return ts->swi_errno;
8e71621f	410	#else
33d9cc8a	411	return syscall_err;
8e71621f	412	#endif
3881725c	413	case TARGET_SYS_GET_CMDLINE:
38d0662a	414	{
1c1b40c1 CV	415	/* Build a command-line from the original argv.
	416	*
	417	* The inputs are:
f296c0d1 PM	418	* * arg0, pointer to a buffer of at least the size
	419	* specified in arg1.
	420	* * arg1, size of the buffer pointed to by arg0 in
1c1b40c1 CV	421	* bytes.
	422	*
	423	* The outputs are:
f296c0d1	424	* * arg0, pointer to null-terminated string of the
1c1b40c1	425	* command line.
f296c0d1	426	* * arg1, length of the string pointed to by arg0.
1c1b40c1	427	*/
579a97f7	428
1c1b40c1	429	char *output_buffer;
f296c0d1	430	size_t input_size;
1c1b40c1 CV	431	size_t output_size;
1c1b40c1 CV	432	int status = 0;
f296c0d1 PM	433	GET_ARG(0);
	434	GET_ARG(1);
	435	input_size = arg1;
1c1b40c1 CV	436	/* Compute the size of the output string. */
	437	#if !defined(CONFIG_USER_ONLY)
	438	output_size = strlen(ts->boot_info->kernel_filename)
	439	+ 1 /* Separating space. */
	440	+ strlen(ts->boot_info->kernel_cmdline)
	441	+ 1; /* Terminating null byte. */
	442	#else
	443	unsigned int i;
38d0662a	444
1c1b40c1 CV	445	output_size = ts->info->arg_end - ts->info->arg_start;
1c1b40c1 CV	446	if (!output_size) {
2e8785ac WS	447	/* We special-case the "empty command line" case (argc==0).
2e8785ac WS	448	Just provide the terminating 0. */
1c1b40c1 CV	449	output_size = 1;
	450	}
	451	#endif
38d0662a	452
1c1b40c1 CV	453	if (output_size > input_size) {
	454	/* Not enough space to store command-line arguments. */
	455	return -1;
38d0662a	456	}
38d0662a	457
1c1b40c1	458	/* Adjust the command-line length. */
f296c0d1 PM	459	if (SET_ARG(1, output_size - 1)) {
	460	/* Couldn't write back to argument block */
	461	return -1;
	462	}
38d0662a	463
1c1b40c1	464	/* Lock the buffer on the ARM side. */
f296c0d1	465	output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
1c1b40c1 CV	466	if (!output_buffer) {
	467	return -1;
	468	}
38d0662a	469
1c1b40c1 CV	470	/* Copy the command-line arguments. */
	471	#if !defined(CONFIG_USER_ONLY)
	472	pstrcpy(output_buffer, output_size, ts->boot_info->kernel_filename);
	473	pstrcat(output_buffer, output_size, " ");
	474	pstrcat(output_buffer, output_size, ts->boot_info->kernel_cmdline);
	475	#else
	476	if (output_size == 1) {
	477	/* Empty command-line. */
	478	output_buffer[0] = '\0';
	479	goto out;
	480	}
2e8785ac	481
1c1b40c1 CV	482	if (copy_from_user(output_buffer, ts->info->arg_start,
	483	output_size)) {
	484	status = -1;
	485	goto out;
2e8785ac WS	486	}
2e8785ac WS	487
1c1b40c1 CV	488	/* Separate arguments by white spaces. */
	489	for (i = 0; i < output_size - 1; i++) {
	490	if (output_buffer[i] == 0) {
	491	output_buffer[i] = ' ';
	492	}
	493	}
	494	out:
	495	#endif
	496	/* Unlock the buffer on the ARM side. */
f296c0d1	497	unlock_user(output_buffer, arg0, output_size);
2e8785ac	498
1c1b40c1	499	return status;
38d0662a	500	}
3881725c	501	case TARGET_SYS_HEAPINFO:
a4f81979 FB	502	{
	503	uint32_t *ptr;
	504	uint32_t limit;
f296c0d1	505	GET_ARG(0);
a4f81979	506
8e71621f PB	507	#ifdef CONFIG_USER_ONLY
8e71621f PB	508	/* Some C libraries assume the heap immediately follows .bss, so
a4f81979 FB	509	allocate it using sbrk. */
a4f81979 FB	510	if (!ts->heap_limit) {
206ae74a	511	abi_ulong ret;
a4f81979	512
53a5960a	513	ts->heap_base = do_brk(0);
a4f81979 FB	514	limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
	515	/* Try a big heap, and reduce the size if that fails. */
	516	for (;;) {
53a5960a	517	ret = do_brk(limit);
206ae74a	518	if (ret >= limit) {
a4f81979	519	break;
206ae74a	520	}
a4f81979 FB	521	limit = (ts->heap_base >> 1) + (limit >> 1);
	522	}
	523	ts->heap_limit = limit;
	524	}
3b46e624	525
f296c0d1 PM	526	ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
f296c0d1 PM	527	if (!ptr) {
579a97f7 FB	528	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	529	return (uint32_t)-1;
f296c0d1	530	}
a4f81979 FB	531	ptr[0] = tswap32(ts->heap_base);
	532	ptr[1] = tswap32(ts->heap_limit);
	533	ptr[2] = tswap32(ts->stack_base);
	534	ptr[3] = tswap32(0); /* Stack limit. */
f296c0d1	535	unlock_user(ptr, arg0, 16);
8e71621f PB	536	#else
8e71621f PB	537	limit = ram_size;
f296c0d1 PM	538	ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
f296c0d1 PM	539	if (!ptr) {
579a97f7 FB	540	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	541	return (uint32_t)-1;
f296c0d1	542	}
8e71621f PB	543	/* TODO: Make this use the limit of the loaded application. */
	544	ptr[0] = tswap32(limit / 2);
	545	ptr[1] = tswap32(limit);
	546	ptr[2] = tswap32(limit); /* Stack base */
	547	ptr[3] = tswap32(0); /* Stack limit. */
f296c0d1	548	unlock_user(ptr, arg0, 16);
8e71621f	549	#endif
a4f81979 FB	550	return 0;
a4f81979 FB	551	}
3881725c	552	case TARGET_SYS_EXIT:
0e1c9c54	553	gdb_exit(env, 0);
a4f81979 FB	554	exit(0);
	555	default:
	556	fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
878096ee	557	cpu_dump_state(CPU(cpu), stderr, fprintf, 0);
a4f81979 FB	558	abort();
	559	}
	560	}