File content as of revision 0:fd0d7bdfcdc2:

/* mbed Microcontroller Library
 * Copyright (c) 2006-2012 ARM Limited
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include "cmsis.h"
#include "semihost_api.h"

#include <stdint.h>
#include <string.h>

// ARM Semihosting Commands
#define SYS_OPEN   (0x1)
#define SYS_CLOSE  (0x2)
#define SYS_WRITE  (0x5)
#define SYS_READ   (0x6)
#define SYS_ISTTY  (0x9)
#define SYS_SEEK   (0xa)
#define SYS_ENSURE (0xb)
#define SYS_FLEN   (0xc)
#define SYS_REMOVE (0xe)
#define SYS_RENAME (0xf)
#define SYS_EXIT   (0x18)

// mbed Semihosting Commands
#define RESERVED_FOR_USER_APPLICATIONS (0x100) // 0x100 - 0x1ff 
#define USR_XFFIND      (RESERVED_FOR_USER_APPLICATIONS + 0)
#define USR_UID      (RESERVED_FOR_USER_APPLICATIONS + 1)
#define USR_RESET     (RESERVED_FOR_USER_APPLICATIONS + 2)
#define USR_VBUS     (RESERVED_FOR_USER_APPLICATIONS + 3)
#define USR_POWERDOWN     (RESERVED_FOR_USER_APPLICATIONS + 4)
#define USR_DISABLEDEBUG (RESERVED_FOR_USER_APPLICATIONS + 5)

#if DEVICE_LOCALFILESYSTEM
FILEHANDLE semihost_open(const char* name, int openmode) {
    uint32_t args[3];
    args[0] = (uint32_t)name;
    args[1] = (uint32_t)openmode;
    args[2] = (uint32_t)strlen(name);
    return __semihost(SYS_OPEN, args);
}

int semihost_close(FILEHANDLE fh) {
    return __semihost(SYS_CLOSE, &fh);
}

int semihost_write(FILEHANDLE fh, const unsigned char* buffer, unsigned int length, int mode) {
    uint32_t args[3];
    args[0] = (uint32_t)fh;
    args[1] = (uint32_t)buffer;
    args[2] = (uint32_t)length; 
    return __semihost(SYS_WRITE, args);
} 

int semihost_read(FILEHANDLE fh, unsigned char* buffer, unsigned int length, int mode) {
    uint32_t args[3];
    args[0] = (uint32_t)fh;
    args[1] = (uint32_t)buffer;
    args[2] = (uint32_t)length; 
    return __semihost(SYS_READ, args); 
}

int semihost_istty(FILEHANDLE fh) {
    return __semihost(SYS_ISTTY, &fh);
}

int semihost_seek(FILEHANDLE fh, long position) {
    uint32_t args[2];
    args[0] = (uint32_t)fh;
    args[1] = (uint32_t)position;
    return __semihost(SYS_SEEK, args);
}

int semihost_ensure(FILEHANDLE fh) {
    return __semihost(SYS_ENSURE, &fh);
}

long semihost_flen(FILEHANDLE fh) { 
    return __semihost(SYS_FLEN, &fh);
}

int semihost_remove(const char *name) {
    uint32_t args[2];
    args[0] = (uint32_t)name;
    args[1] = (uint32_t)strlen(name);
    return __semihost(SYS_REMOVE, args);
}

int semihost_rename(const char *old_name, const char *new_name) {
    uint32_t args[4];
    args[0] = (uint32_t)old_name;
    args[1] = (uint32_t)strlen(old_name);
    args[0] = (uint32_t)new_name;
    args[1] = (uint32_t)strlen(new_name);
    return __semihost(SYS_RENAME, args);
}
#endif

int semihost_exit(void) {
    uint32_t args[4];
    return __semihost(SYS_EXIT, args);
}

int semihost_uid(char *uid) {
    uint32_t args[2];
    args[0] = (uint32_t)uid;
    args[1] = 33;
    return __semihost(USR_UID, &args);
}

int semihost_reset(void) {
    // Does not normally return, however if used with older firmware versions
    // that do not support this call it will return -1.
    return __semihost(USR_RESET, NULL);
}

int semihost_vbus(void) {
    return __semihost(USR_VBUS, NULL);
}

int semihost_powerdown(void) {
    return __semihost(USR_POWERDOWN, NULL);
}

#if !(DEVICE_DEBUG_AWARENESS)
// These processors cannot know if the interface is connect, assume so:
static int is_debugger_attached = 1;

int semihost_connected(void) {
    return is_debugger_attached;
}
#endif

int semihost_disabledebug(void) {
#if !(DEVICE_DEBUG_AWARENESS)
    is_debugger_attached = 0;
#endif
    return __semihost(USR_DISABLEDEBUG, NULL);
}