[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 = 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:
        gdb_exit(env, 0);
        exit(0);
    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 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	129	#ifdef CONFIG_USER_ONLY
0429a971	130	TaskState *ts = cs->opaque;
a2d1ebaf	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);
33d9cc8a PB	166	#ifdef CONFIG_USER_ONLY
0429a971	167	((TaskState *)cs->opaque)->swi_errno = err;
33d9cc8a PB	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);
0429a971	186	CPUState *cs = CPU(cpu);
53a5960a	187	target_ulong args;
f296c0d1	188	target_ulong arg0, arg1, arg2, arg3;
a4f81979 FB	189	char * s;
	190	int nr;
	191	uint32_t ret;
8e71621f PB	192	uint32_t len;
8e71621f PB	193	#ifdef CONFIG_USER_ONLY
0429a971	194	TaskState *ts = cs->opaque;
8e71621f	195	#else
81926f47	196	CPUARMState *ts = env;
8e71621f	197	#endif
a4f81979 FB	198
a4f81979 FB	199	nr = env->regs[0];
53a5960a	200	args = env->regs[1];
a4f81979	201	switch (nr) {
3881725c	202	case TARGET_SYS_OPEN:
f296c0d1 PM	203	GET_ARG(0);
	204	GET_ARG(1);
	205	GET_ARG(2);
	206	s = lock_user_string(arg0);
	207	if (!s) {
579a97f7 FB	208	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	209	return (uint32_t)-1;
f296c0d1 PM	210	}
	211	if (arg1 >= 12) {
	212	unlock_user(s, arg0, 0);
579a97f7	213	return (uint32_t)-1;
396bef4b	214	}
a4f81979	215	if (strcmp(s, ":tt") == 0) {
f296c0d1 PM	216	int result_fileno = arg1 < 4 ? STDIN_FILENO : STDOUT_FILENO;
f296c0d1 PM	217	unlock_user(s, arg0, 0);
396bef4b	218	return result_fileno;
a4f81979	219	}
a2d1ebaf	220	if (use_gdb_syscalls()) {
f296c0d1 PM	221	gdb_do_syscall(arm_semi_cb, "open,%s,%x,1a4", arg0,
f296c0d1 PM	222	(int)arg2+1, gdb_open_modeflags[arg1]);
396bef4b	223	ret = env->regs[0];
a2d1ebaf	224	} else {
f296c0d1	225	ret = set_swi_errno(ts, open(s, open_modeflags[arg1], 0644));
a2d1ebaf	226	}
f296c0d1	227	unlock_user(s, arg0, 0);
8e71621f	228	return ret;
3881725c	229	case TARGET_SYS_CLOSE:
f296c0d1	230	GET_ARG(0);
a2d1ebaf	231	if (use_gdb_syscalls()) {
f296c0d1	232	gdb_do_syscall(arm_semi_cb, "close,%x", arg0);
a2d1ebaf PB	233	return env->regs[0];
a2d1ebaf PB	234	} else {
f296c0d1	235	return set_swi_errno(ts, close(arg0));
a2d1ebaf	236	}
3881725c	237	case TARGET_SYS_WRITEC:
53a5960a	238	{
2f619698 FB	239	char c;
	240
	241	if (get_user_u8(c, args))
	242	/* FIXME - should this error code be -TARGET_EFAULT ? */
	243	return (uint32_t)-1;
53a5960a	244	/* Write to debug console. stderr is near enough. */
a2d1ebaf PB	245	if (use_gdb_syscalls()) {
	246	gdb_do_syscall(arm_semi_cb, "write,2,%x,1", args);
	247	return env->regs[0];
	248	} else {
	249	return write(STDERR_FILENO, &c, 1);
	250	}
53a5960a	251	}
3881725c	252	case TARGET_SYS_WRITE0:
579a97f7 FB	253	if (!(s = lock_user_string(args)))
	254	/* FIXME - should this error code be -TARGET_EFAULT ? */
	255	return (uint32_t)-1;
a2d1ebaf PB	256	len = strlen(s);
	257	if (use_gdb_syscalls()) {
	258	gdb_do_syscall(arm_semi_cb, "write,2,%x,%x\n", args, len);
	259	ret = env->regs[0];
	260	} else {
	261	ret = write(STDERR_FILENO, s, len);
	262	}
53a5960a PB	263	unlock_user(s, args, 0);
53a5960a PB	264	return ret;
3881725c	265	case TARGET_SYS_WRITE:
f296c0d1 PM	266	GET_ARG(0);
	267	GET_ARG(1);
	268	GET_ARG(2);
	269	len = arg2;
a2d1ebaf PB	270	if (use_gdb_syscalls()) {
a2d1ebaf PB	271	arm_semi_syscall_len = len;
f296c0d1	272	gdb_do_syscall(arm_semi_cb, "write,%x,%x,%x", arg0, arg1, len);
a2d1ebaf PB	273	return env->regs[0];
a2d1ebaf PB	274	} else {
f296c0d1 PM	275	s = lock_user(VERIFY_READ, arg1, len, 1);
f296c0d1 PM	276	if (!s) {
579a97f7 FB	277	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	278	return (uint32_t)-1;
f296c0d1 PM	279	}
	280	ret = set_swi_errno(ts, write(arg0, s, len));
	281	unlock_user(s, arg1, 0);
a2d1ebaf PB	282	if (ret == (uint32_t)-1)
	283	return -1;
	284	return len - ret;
	285	}
3881725c	286	case TARGET_SYS_READ:
f296c0d1 PM	287	GET_ARG(0);
	288	GET_ARG(1);
	289	GET_ARG(2);
	290	len = arg2;
a2d1ebaf PB	291	if (use_gdb_syscalls()) {
a2d1ebaf PB	292	arm_semi_syscall_len = len;
f296c0d1	293	gdb_do_syscall(arm_semi_cb, "read,%x,%x,%x", arg0, arg1, len);
a2d1ebaf PB	294	return env->regs[0];
a2d1ebaf PB	295	} else {
f296c0d1 PM	296	s = lock_user(VERIFY_WRITE, arg1, len, 0);
f296c0d1 PM	297	if (!s) {
579a97f7 FB	298	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	299	return (uint32_t)-1;
f296c0d1 PM	300	}
	301	do {
	302	ret = set_swi_errno(ts, read(arg0, s, len));
	303	} while (ret == -1 && errno == EINTR);
	304	unlock_user(s, arg1, len);
a2d1ebaf PB	305	if (ret == (uint32_t)-1)
	306	return -1;
	307	return len - ret;
	308	}
3881725c	309	case TARGET_SYS_READC:
b90372ad	310	/* XXX: Read from debug console. Not implemented. */
a4f81979	311	return 0;
3881725c	312	case TARGET_SYS_ISTTY:
f296c0d1	313	GET_ARG(0);
a2d1ebaf	314	if (use_gdb_syscalls()) {
f296c0d1	315	gdb_do_syscall(arm_semi_cb, "isatty,%x", arg0);
a2d1ebaf PB	316	return env->regs[0];
a2d1ebaf PB	317	} else {
f296c0d1	318	return isatty(arg0);
a2d1ebaf	319	}
3881725c	320	case TARGET_SYS_SEEK:
f296c0d1 PM	321	GET_ARG(0);
f296c0d1 PM	322	GET_ARG(1);
a2d1ebaf	323	if (use_gdb_syscalls()) {
f296c0d1	324	gdb_do_syscall(arm_semi_cb, "lseek,%x,%x,0", arg0, arg1);
a2d1ebaf PB	325	return env->regs[0];
a2d1ebaf PB	326	} else {
f296c0d1	327	ret = set_swi_errno(ts, lseek(arg0, arg1, SEEK_SET));
a2d1ebaf PB	328	if (ret == (uint32_t)-1)
	329	return -1;
	330	return 0;
	331	}
3881725c	332	case TARGET_SYS_FLEN:
f296c0d1	333	GET_ARG(0);
a2d1ebaf	334	if (use_gdb_syscalls()) {
5fafdf24	335	gdb_do_syscall(arm_semi_flen_cb, "fstat,%x,%x",
f296c0d1	336	arg0, env->regs[13]-64);
33d9cc8a	337	return env->regs[0];
a2d1ebaf	338	} else {
a4f81979	339	struct stat buf;
f296c0d1	340	ret = set_swi_errno(ts, fstat(arg0, &buf));
a4f81979 FB	341	if (ret == (uint32_t)-1)
	342	return -1;
	343	return buf.st_size;
	344	}
3881725c	345	case TARGET_SYS_TMPNAM:
a4f81979 FB	346	/* XXX: Not implemented. */
a4f81979 FB	347	return -1;
3881725c	348	case TARGET_SYS_REMOVE:
f296c0d1 PM	349	GET_ARG(0);
f296c0d1 PM	350	GET_ARG(1);
a2d1ebaf	351	if (use_gdb_syscalls()) {
f296c0d1	352	gdb_do_syscall(arm_semi_cb, "unlink,%s", arg0, (int)arg1+1);
a2d1ebaf PB	353	ret = env->regs[0];
a2d1ebaf PB	354	} else {
f296c0d1 PM	355	s = lock_user_string(arg0);
f296c0d1 PM	356	if (!s) {
579a97f7 FB	357	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	358	return (uint32_t)-1;
f296c0d1	359	}
a2d1ebaf	360	ret = set_swi_errno(ts, remove(s));
f296c0d1	361	unlock_user(s, arg0, 0);
a2d1ebaf	362	}
8e71621f	363	return ret;
3881725c	364	case TARGET_SYS_RENAME:
f296c0d1 PM	365	GET_ARG(0);
	366	GET_ARG(1);
	367	GET_ARG(2);
	368	GET_ARG(3);
a2d1ebaf PB	369	if (use_gdb_syscalls()) {
a2d1ebaf PB	370	gdb_do_syscall(arm_semi_cb, "rename,%s,%s",
f296c0d1	371	arg0, (int)arg1+1, arg2, (int)arg3+1);
a2d1ebaf PB	372	return env->regs[0];
a2d1ebaf PB	373	} else {
8e71621f	374	char *s2;
f296c0d1 PM	375	s = lock_user_string(arg0);
f296c0d1 PM	376	s2 = lock_user_string(arg2);
579a97f7 FB	377	if (!s \|\| !s2)
	378	/* FIXME - should this error code be -TARGET_EFAULT ? */
	379	ret = (uint32_t)-1;
	380	else
	381	ret = set_swi_errno(ts, rename(s, s2));
	382	if (s2)
f296c0d1	383	unlock_user(s2, arg2, 0);
579a97f7	384	if (s)
f296c0d1	385	unlock_user(s, arg0, 0);
8e71621f PB	386	return ret;
8e71621f PB	387	}
3881725c	388	case TARGET_SYS_CLOCK:
a4f81979	389	return clock() / (CLOCKS_PER_SEC / 100);
3881725c	390	case TARGET_SYS_TIME:
a4f81979	391	return set_swi_errno(ts, time(NULL));
3881725c	392	case TARGET_SYS_SYSTEM:
f296c0d1 PM	393	GET_ARG(0);
f296c0d1 PM	394	GET_ARG(1);
a2d1ebaf	395	if (use_gdb_syscalls()) {
f296c0d1	396	gdb_do_syscall(arm_semi_cb, "system,%s", arg0, (int)arg1+1);
a2d1ebaf PB	397	return env->regs[0];
a2d1ebaf PB	398	} else {
f296c0d1 PM	399	s = lock_user_string(arg0);
f296c0d1 PM	400	if (!s) {
579a97f7 FB	401	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	402	return (uint32_t)-1;
f296c0d1	403	}
a2d1ebaf	404	ret = set_swi_errno(ts, system(s));
f296c0d1	405	unlock_user(s, arg0, 0);
a982b531	406	return ret;
a2d1ebaf	407	}
3881725c	408	case TARGET_SYS_ERRNO:
8e71621f	409	#ifdef CONFIG_USER_ONLY
a4f81979	410	return ts->swi_errno;
8e71621f	411	#else
33d9cc8a	412	return syscall_err;
8e71621f	413	#endif
3881725c	414	case TARGET_SYS_GET_CMDLINE:
38d0662a	415	{
1c1b40c1 CV	416	/* Build a command-line from the original argv.
	417	*
	418	* The inputs are:
f296c0d1 PM	419	* * arg0, pointer to a buffer of at least the size
	420	* specified in arg1.
	421	* * arg1, size of the buffer pointed to by arg0 in
1c1b40c1 CV	422	* bytes.
	423	*
	424	* The outputs are:
f296c0d1	425	* * arg0, pointer to null-terminated string of the
1c1b40c1	426	* command line.
f296c0d1	427	* * arg1, length of the string pointed to by arg0.
1c1b40c1	428	*/
579a97f7	429
1c1b40c1	430	char *output_buffer;
f296c0d1	431	size_t input_size;
1c1b40c1 CV	432	size_t output_size;
1c1b40c1 CV	433	int status = 0;
f296c0d1 PM	434	GET_ARG(0);
	435	GET_ARG(1);
	436	input_size = arg1;
1c1b40c1 CV	437	/* Compute the size of the output string. */
	438	#if !defined(CONFIG_USER_ONLY)
	439	output_size = strlen(ts->boot_info->kernel_filename)
	440	+ 1 /* Separating space. */
	441	+ strlen(ts->boot_info->kernel_cmdline)
	442	+ 1; /* Terminating null byte. */
	443	#else
	444	unsigned int i;
38d0662a	445
1c1b40c1 CV	446	output_size = ts->info->arg_end - ts->info->arg_start;
1c1b40c1 CV	447	if (!output_size) {
2e8785ac WS	448	/* We special-case the "empty command line" case (argc==0).
2e8785ac WS	449	Just provide the terminating 0. */
1c1b40c1 CV	450	output_size = 1;
	451	}
	452	#endif
38d0662a	453
1c1b40c1 CV	454	if (output_size > input_size) {
	455	/* Not enough space to store command-line arguments. */
	456	return -1;
38d0662a	457	}
38d0662a	458
1c1b40c1	459	/* Adjust the command-line length. */
f296c0d1 PM	460	if (SET_ARG(1, output_size - 1)) {
	461	/* Couldn't write back to argument block */
	462	return -1;
	463	}
38d0662a	464
1c1b40c1	465	/* Lock the buffer on the ARM side. */
f296c0d1	466	output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
1c1b40c1 CV	467	if (!output_buffer) {
	468	return -1;
	469	}
38d0662a	470
1c1b40c1 CV	471	/* Copy the command-line arguments. */
	472	#if !defined(CONFIG_USER_ONLY)
	473	pstrcpy(output_buffer, output_size, ts->boot_info->kernel_filename);
	474	pstrcat(output_buffer, output_size, " ");
	475	pstrcat(output_buffer, output_size, ts->boot_info->kernel_cmdline);
	476	#else
	477	if (output_size == 1) {
	478	/* Empty command-line. */
	479	output_buffer[0] = '\0';
	480	goto out;
	481	}
2e8785ac	482
1c1b40c1 CV	483	if (copy_from_user(output_buffer, ts->info->arg_start,
	484	output_size)) {
	485	status = -1;
	486	goto out;
2e8785ac WS	487	}
2e8785ac WS	488
1c1b40c1 CV	489	/* Separate arguments by white spaces. */
	490	for (i = 0; i < output_size - 1; i++) {
	491	if (output_buffer[i] == 0) {
	492	output_buffer[i] = ' ';
	493	}
	494	}
	495	out:
	496	#endif
	497	/* Unlock the buffer on the ARM side. */
f296c0d1	498	unlock_user(output_buffer, arg0, output_size);
2e8785ac	499
1c1b40c1	500	return status;
38d0662a	501	}
3881725c	502	case TARGET_SYS_HEAPINFO:
a4f81979 FB	503	{
	504	uint32_t *ptr;
	505	uint32_t limit;
f296c0d1	506	GET_ARG(0);
a4f81979	507
8e71621f PB	508	#ifdef CONFIG_USER_ONLY
8e71621f PB	509	/* Some C libraries assume the heap immediately follows .bss, so
a4f81979 FB	510	allocate it using sbrk. */
a4f81979 FB	511	if (!ts->heap_limit) {
206ae74a	512	abi_ulong ret;
a4f81979	513
53a5960a	514	ts->heap_base = do_brk(0);
a4f81979 FB	515	limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
	516	/* Try a big heap, and reduce the size if that fails. */
	517	for (;;) {
53a5960a	518	ret = do_brk(limit);
206ae74a	519	if (ret >= limit) {
a4f81979	520	break;
206ae74a	521	}
a4f81979 FB	522	limit = (ts->heap_base >> 1) + (limit >> 1);
	523	}
	524	ts->heap_limit = limit;
	525	}
3b46e624	526
f296c0d1 PM	527	ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
f296c0d1 PM	528	if (!ptr) {
579a97f7 FB	529	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	530	return (uint32_t)-1;
f296c0d1	531	}
a4f81979 FB	532	ptr[0] = tswap32(ts->heap_base);
	533	ptr[1] = tswap32(ts->heap_limit);
	534	ptr[2] = tswap32(ts->stack_base);
	535	ptr[3] = tswap32(0); /* Stack limit. */
f296c0d1	536	unlock_user(ptr, arg0, 16);
8e71621f PB	537	#else
8e71621f PB	538	limit = ram_size;
f296c0d1 PM	539	ptr = lock_user(VERIFY_WRITE, arg0, 16, 0);
f296c0d1 PM	540	if (!ptr) {
579a97f7 FB	541	/* FIXME - should this error code be -TARGET_EFAULT ? */
579a97f7 FB	542	return (uint32_t)-1;
f296c0d1	543	}
8e71621f PB	544	/* TODO: Make this use the limit of the loaded application. */
	545	ptr[0] = tswap32(limit / 2);
	546	ptr[1] = tswap32(limit);
	547	ptr[2] = tswap32(limit); /* Stack base */
	548	ptr[3] = tswap32(0); /* Stack limit. */
f296c0d1	549	unlock_user(ptr, arg0, 16);
8e71621f	550	#endif
a4f81979 FB	551	return 0;
a4f81979 FB	552	}
3881725c	553	case TARGET_SYS_EXIT:
0e1c9c54	554	gdb_exit(env, 0);
a4f81979 FB	555	exit(0);
	556	default:
	557	fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);
0429a971	558	cpu_dump_state(cs, stderr, fprintf, 0);
a4f81979 FB	559	abort();
	560	}
	561	}